EDTA Therapy for Vascular Disease

Chelation Natural Miracle For Protecting Your Heart

Chelation therapy has been conclusively shown to be up to 82 Percent Effective at dissolving the plaque that blocks arteries! In the ebook Chelation Natural Miracle For Protecting Your Heart you'll discover: The frustrating reason many doctors are ignoring Edta chelationor even openly rejecting it. The deadly heart surgeries even the American Heart Association admits are unnecessary. The hidden signs and symptoms of heart attacks and strokes? Are you in danger right now?. The average number of years stripped away by heart and vessel disease. Can you get them back?. The newest set of risk factors for heart disease (they'll likely surprise you!). Shady government practices that protect Big Pharma and keep Edta chelation out of the public eye. How the Roman Empire could have been savedif only they'd known about Edta chelation. Why Edta chelation is guaranteed to be safeeven in extremely high doses. (It puts aspirin to shame!). The shocking truth about plaque in young childrenand how to keep your little ones safer. Why dentists, artists and welders need Edta chelationand whether your workplace is dangerous too. The differences between IV and oral chelationand which kind of Edta is right for you. Other forms of chelationand how these little-known treatments can dramatically boost your health.

Chelation Natural Miracle For Protecting Your Heart Summary


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Long Term Iron Chelation

In the follow-up of ex-thalassemic patients after bone marrow transplantation, biosusceptometry offers a useful tool for the management of chelation treatment and monitoring iron redistribution effects (Fischer et al., 1997). Since class I patients with LIC 2000 mg gww-1 have the best chance of survival (Lucarelli et al., 1995), BLS can also provide a valuable guide to adjusting chelation treatment prior to transplantation.

[ProteinSH ExceSS 9lutathione mathxSS[protein

This section is specific for the GSH matrix activated by reaction with Py-2-S-S-2-Py. As in ion exchange, we recommend that the sample be prepared in the buffer used for equilibrating the column. Tris-HCl buffer, 0.1 M, pH 8 and sodium acetate buffer, 0.1 M, pH 4 both containing 0.3 M NaCl and 1 mM EDTA are recommended buffers (Scouten 1981). Other buffers may also be used as long as they do not interfere with the stability of the matrix and the target protein. During loading, Py-2-SH is eluted from the column, and since it absorbs at 343 nm it can easily be monitored. In fact, the displacement of Py-2-SH can also be used to determine the efficiency of the coupling reaction.

Thalassemia Intermedia

Chelation therapy is required at an older age than in thalassemia major because patients have received fewer transfusions. It should be started when the serum ferritin level has risen to more than 1000 ng mL and the desferrioxamine challenge produces sufficient urine iron excretion.

Transfection of ES Cells

Harvest the cells with trypsin-EDTA and plate 105 cells into each well of a gelatinized six-well tissue culture plate in 4 mL of ES medium containing rLIF. 7. When the surviving colonies have become established, harvest all wells using trypsin-EDTA and pool to form a polyclonal cell line, which may be expanded in a gelatinized 25-cm2 flask in ES medium supplemented with G418 and rLIF.

Basic Techniques in Molecular Biology Ralph Rapley

The use of DNA for medical analysis or for research-driven manipulation usually requires that it be isolated and purified to a certain degree. DNA is usually recovered from cells by methods that include cell rupture but that prevent the DNA from fragmenting by mechanical shearing. This is generally undertaken in the presence of EDTA, which chelates the magnesium ions needed

Preparation of Oriented DNA Fibers

The methods of cell lysis on the slides are based on a treatment with soda (technique 3) or the combined use of SDS, Triton, and EDTA (technique 4) or salt, SDS, and Triton (technique 5). The orientation of fibers is obtained by draining the solutions on tilted slides. The cell lysis performed in agarose uses A-lauroylsarcosine and EDTA in the presence of proteinase K (technique 6), and the molecules are mechanically stretched with the edge of a second slide.

Coupling of Endothelial Cell Specific Targeting Devices to Liposomes

Although all of these methods have their advantages and disadvantages, the sulfhydryl maleimido coupling methods are convenient methods to conjugate endothelial targeting ligands in our experience. In this procedure, free sulfhydryl groups are introduced in the protein to be coupled to the liposome, using N-succinimidyl-S-acethylthioacetate (SATA) as a heterobifunctional reagent. After separation of the free SATA from the protein by gel permeation chromatography, the acetylthioacetate-protein conjugate is deacetylated by addition of a freshly prepared solution of 0.5 M hydroxylamine-HCl, 0.5 M Hepes, 25 M ethylenediaminetetraacetate (EDTA), pH 7.0. After deace-tylation, the thioacetyl-protein conjugate is allowed to react for four hours at room temperature or overnight at 4 C with liposomes containing either mal-eimido-4-(p-phenylbutyryl) phosphatidylethanolamine as a functionalized lipid or as functionalized, bilayer anchored PEG chain. The coupling reaction is stopped by the...

Iron Mobilization from Ferritin

Storage iron, whether it be haemosiderin or ferritin, can be mobilized to meet body iron requirements. The molecular mechanisms that allow iron release in vivo are not understood. Most of the studies on iron mobilization have used in vitro systems involving the incubation of ferritin or haemosiderin, either with chelators alone or with low-molecular-weight reducing agents in the presence of non-physiological Fe(II) chelators, such as 2,2'-bipyridine (Sirivech et al., 1974), bathophenanthroline sulfonate (Biemond et al., 1986) or ferrozine (Boyer et al., 1988). The concerns emitted by Phil Aisen (Aisen, 1998) concerning their use in the demonstration of 'true' ferric iron reductase activity (Chapter 5) need to be reechoed here. It should also be underlined that placing a large excess of a powerful Fe(II) chelator in the presence of a reducing agent and Fe(III) is tantamount to placing a bar magnet in the presence of a large number of iron filings - what we referred to earlier as a...

Immunoblotting With Phospho Specific Antibodies

Disruption buffer Digitonin (0.05 , pH 7.4) diluted in glass distilled water containing 20 mM Tris, 137 mM NaCl, 50 mM sodium fluoride, 5 mM ethylene diamine tetraacetic acid (EDTA), 1 mM 4-(2-aminoethyl) benzenesulfonyl fluoride , 10 mM Na pyrophosphate, 1 mM sodium orthovanadate, and 2 ag mL leupeptin. Prepare buffer fresh from stock solutions. Sodium fluoride (protein phosphatase inhibitor), AEBSF (serine protease inhibitor), and leupeptin (protease inhibitor) are toxic, and gloves should be worn throughout the preparation and use of this buffer. Digitonin is prepared as a 0.5 (w v) stock solution in distilled water, heated to 95 C, and cooled to room temperature. AEBSF is less toxic and is a stable water-soluble alternative to PMSF. It is prepared as a 100 mM stock solution in water and is stable for 6 mo with storage at 4 C at pH

Integrated Strategies for Bioanalysis

Many bioanalytical laboratories have looked beyond LC-MS MS and have found gains in efficiency by the development of integrated strategies with animal-handling groups. One of the best examples was reported by Zhang et al., who described a comprehensive strategy that involves plasma collection in 96-well format followed by robotic plasma transfer and semiautomated sample preparation 116 . Similarly, we have found extensive benefit from implementation of a 96-well plasma collection strategy. A frequently overlooked problem in automated approaches that involve plasma transfer is difficulty in pipetting due to fibrin clots and lipid material that does not pellet upon cen-trifugation. Even though the degree of clot formation is improved with the use of ethylene diamine tetraacetic acid (EDTA) as the anticoagulant 117 , this phenomenon leads to poor pipetting accuracy and the need to repipette the affected samples. To address this problem, we recently implemented a novel 96-well filter...

Secondary Hemochromatosis

Application of BLS in patients with secondary hemochromatosis is of major importance, as these patients must be monitored regularly (annually to biennially) in order to avoid long-term toxicity from iron overload or inadequate chelator dosing. The routinely used laboratory parameter, serum ferritin, has been shown to be a poor indicator for iron overload monitoring in thalassemia and sickle cell disease in comparison to BLS (Brittenham et al., 1993 Fischer et al., 1999). The ratio between iron accumulation from blood transfusions and total chelator intake was shown to correlate with LIC, and a LIC value 4500 mg g_1 liver indicated a high risk for developing complications and for death (Brittenham et al., 1994). Moreover, compliance with actual chelation treatment was shown to be highly correlated with LIC (Fischer et al., 2000).

PSCThe Polysaccharide from Neisseria meningitides Sero Group C

Native and Modified Snake Venoms The native pooled venoms from five different species of Bothropic (B. alternatus, B. jararaca, B. jararacussu, B. moojeni, and B. neuwiedi) and the venom of Crotalus durissus terrificus were gifted by Secao de Venenos-IBu. To chemically modify the snake venoms the pool of Bothropic or Crotalus durissus terrificus venoms (5 mg mL) were solubilized in manitol phosphate buffer (MPB)-pBB Ethylene diamine tetra acetic acid (EDTA) buffer (20 mM phosphate, 295 mM mannitol, 5mM EDTA, 3mM 4-bromophenacyl bromide, pH 7.2). The solutions were incubated by two hours at 37 C with a gentle agitation.

Review Activities

Explain how aspirin, coumarin drugs, EDTA, and heparin function as anticoagulants. Which of these are effective when added to a test tube Which are not Why in due course his blood measurements return to normal. What was the reason for the low red blood cell count and high proportion of reticulocytes A chemical called EDTA, like citrate, binds to (or chelates ) Ca2+. Suppose a person had EDTA infused into the blood. What effect would this have on the intrinsic and extrinsic clotting pathways How would these effects differ from the effects of aspirin on blood clotting

Preparation of Cell Membrane Homogenates

The membrane homogenate preparation procedure isolates cell membranes and membrane-associated macromolecules and assures their homogeneity for assaying small fractions of the preparation in each of many test tubes. It removes the majority of soluble macromolecules, small molecules (including endogenous receptor ligands), and minerals via multiple centrifugation steps each followed by resuspension in fresh buffer containing the divalent ion chelator ethylenediamine tetraacetic acid (EDTA). Some prefer a P2 preparation, which involves discarding an initial pellet generated by a low-speed centrifugation step, but this appears to be unnecessary for these assays.

Plant Chemical Defenses

Aspergillus Flavus

Nonnitrogenous Defenses Nonnitrogenous defenses include phenolics, terpenoids, photooxidants, insect hormone or pheromone analogs, pyrethroids, and aflatoxins (Figs. 3.2-3.5). Phenolics, or flavenoids, are distributed widely among terrestrial plants and are likely among the oldest plant secondary (i.e., nonmetabolic) compounds. Although phenolics are perhaps best known as defenses against herbivores and plant pathogens, they also protect plants from damage by ultraviolet (UV) radiation, provide support for vascular plants (lignins), compose pigments that determine flower color for angiosperms, and play a role in plant nutrient acquisition by affecting soil chemistry. Phenolics include the hydrolyzeable tannins, derivatives of simple phenolic acids, and condensed tannins, polymers of higher molecular weight hydroxyflavenol units (Fig. 3.3). Polymerized tannins are highly resistant to decomposition, eventually composing the humic materials that largely determine soil properties. Tannins...

Experimental Issues Regarding Using Metal Chelators

In most PLIMSTEX experiments, the total ligand concentration is used in the curve fitting. The determination of free ligand concentration is not required because the relationship between the free and total ligand concentrations is resolved in the modeling procedure 24 . For the ras titration, however, we had no Mg2+-free ras-GDP stock but only a limited amount of ras-GDP-Mg2+ stock solution (1.5 mM ras, 10 mM MgCl2, in 64 mM Tris-HCl, 10 mM MgCl2, 1 mM sodium azide, 1 mM DTT buffer, pH 7.6). After diluting by 100 times with 50 mM acid (HEPES) and 0.1 M KCl, pH 7.4 buffer, there was still excess of Mg2+. To conduct the Mg2+ titration of free ras-GDP, we added EDTA to control free Mg2+ in solution free Mg2+ was calculated using a WebChelators program (Webmaxc Standard) on the internet 43, 44 .

Isolation and Oxidative Modification of Human Plasma LDL

Blood is collected from healthy fasting volunteers by venipuncture into tubes containing 1.5 mg of EDTA per milliliter of blood. Blood is centrifuged at 1. In preparation for oxidation, dialyze a portion of the LDL sample against 4 L of PBS at 4 C without EDTA, because the oxidation process will not work in the presence of EDTA which acts as an antioxidant. 2. Adjust the LDL solution (free of EDTA) to a protein concentration of 200 pg mL, and then incubate overnight, with gentle stirring, at 37 C in the presence of 5 pM CuSO4 as the oxidizing agent (see Note 5).

Accutase and Accumax Millipore Chemicon catalog no SCR005 and SCR006

These products are proprietary mixtures of proteolytic and collagenolytic enzymes in EDTA that the manufacturer states is free of mammalian- or bacterial-derived products. Accumax also contains DNAse. If you test this method, start with a 5-minute room temperature incubation and monitor the cells under the microscope. While the manufacturer indicates that inactivation of the enzymes with protein is not necessary, we recommend that protein-containing medium be used to dilute out the enzyme after the cells are dissociated, to prevent clumping and sticking of the cells to the pipettes.

TE Equilibrated Phenol

To the remaining 50 mL of 0.1 M, Tris add 449 mL of water and 1 mL of 0.5 mol EDTA to give 500 mL of TE. Add, mix, let stand, and remove this in three stages as before. The phenol will have reduced in volume during this procedure, but is now TE equilibrated and ready for use.

Nonenzymatic cell dissociation

Ca2+- and Mg2+-free saline solutions containing EDTA or EGTA have not been as widely used for hESC dissociation as the methods described above, but they should offer advantages for assays that require intact cell surface proteins such as flow cytometry and immunocytochemistry. Commercial formulations are available, such as Cell Dissociation Buffer (Invitrogen catalog no. 13150016), which contains glycerol as well as a proprietary mixture of salts and chelators.

Involvement of Lipotransin

A mechanism by which the lipolytic hormones can induce the translocation of the enzyme to LD. In addition to the phosphorylation of HSL, the ATPase activity of li-potransin probably plays a role in controlling the interaction of the proteins. Lipo-transin belongs to the AAA family of proteins, characterized by a signature motif of 230 aa containing an ATP-binding site consensus, and a catalytic center for ATPase 268 . A BLAST search revealed sequence similarity to several AAA family members involved in diverse cellular functions. The AAA module in lipotransin is located from aa 190 to the 3' end of the sequence. One Walker motif A (P loop) was found at aa 249-256. The potential catalytic center for ATPase is at aa 353371 266 . Proteins containing these domains play a role in recognizing and fusing specific membrane populations 269 , priming the assembly or breaking apart of protein complexes and unfolding stable protein conformations 270 . Although ATPase activity is typically...

Reduction of Antibody Disulfide Bonds

For labeling IgG antibodies with thiol-reactive reagents, the antibody should be at 5-10 mg of protein mL in 20 ml sodium or potassium phosphate buffer, pH 7.58.0 containing 150 ml NaCl or 10 ml phosphate-buffered saline ethylene diamine tetraacetic acid (PBS-EDTA). When biotin maleimide or biocytin maleimide derivatives are used, the buffer used for the reduction and subsequent steps should be at pH 6.5-7.2. 4. Remove excess 2-MEA (or DTT) from the reduced antibody (desalting). This step is easily performed on a gel filtration column equilibrated with the appropriate PBS (see step 1 ) containing 5 mM EDTA (also see Note 4). The presence of the reduced antibody in the column effluent should be monitored by A280. Because any residual 2-MEA (or DTT) will inhibit the subsequent labeling reaction, it is important to pool only the most concentrated protein fractions eluting earliest from the desalting column. Desalting by dialysis versus the appropriate...

PHsensitive Liposomes

Sensitive Membranes

PH with DOPE cholesteryl hemisuccinate (CHEMS) liposomes, no intermixing of aqueous contents takes place (57), but these liposomes are efficient in delivering their encapsulated contents into cultured cells (58). Divalent cations may also play a role in delivery by pH-sensitive liposomes. PE oleic acid (OA) liposomes undergo fusion in the presence ofmillimolar concentrations of Ca2+ or Mg2+, and the rate of fusion under acidic conditions is enhanced significantly in the presence of 2 mM Ca2+(32). Cytoplasmic delivery of calcein by DOPE CHEMS liposomes is inhibited in the presence of ethylenediamine tetraacetic acid (EDTA) (58), indicating that divalent cations participate in the destabilization of pH-sensitive liposomes and endosomal membranes, or their fusion with each other.

General considerations on the adherencebased methods

In early studies, results obtained after adherence of monocytes macrophages to solid surfaces with subsequent removal of cells by a rubber policeman (62), were not completely satisfactory because of the variability in the number of viable cells recovered and of their poor responsiveness to activating stimuli (54, 63). However, membrane damage can be significantly reduced by incubating the adherent monocytes with ice-cold PBS prior to their removal by scraping (64). Subsequently, it was found that it is possible to coat Petri dishes with a microexudate from different cells before incubation of mononuclear cells and to remove adherent monocytes macrophages by EDTA (51). This method, however, has the drawback of needing plastics conditioned by a previously resident adherent cell line. A modification of this method has been subsequently described based on pre-treatment of plastic surfaces with serum (52). Effective release of monocytes macrophages has also been achieved by means of...

Competition Assays for Dopamine D2 Receptors

Competitive Binding Assay

The method was also applied to the D2 receptor. In this case however, an incubation medium with nonvolatile components frequently used in radioligand binding assays consisting of 50 mM Tris-HCl, 120 mM NaCl, 5 mM MgCl2, 5 mM KCl and 1 mM EDTA was deliberately employed to demonstrate that the incubation medium in MS binding assays quantifying the nonbound marker is not restricted to volatile buffers. As in the D1 receptor binding assay, a crude membrane fraction of pig striatum was used as the source for the D2 receptors and with spiperone (Fig. 7.4) again the native form of a well established radioligand was chosen as a marker. Preliminary experiments showed, as expected, that the signal of the marker was substantially suppressed, when the nonbound marker was analyzed by LC-ESI-MS MS directly out of the matrix of the binding sample. Therefore a solid phase extraction (SPE) method was employed to remove most of the interfering sample matrix and to enhance the spiperone signal, allowing...

Measurement of Vascular Reactive Oxygen Species Using Other Chemiluminescent Probes

Enhanced Chemiluminescence

Coelenterazine is a very sensitive chemiluminescent probe that has been recommended by Tarpey and colleagues to detect superoxide anion (17). Coelenterazine is highly sensitive and appears less susceptible than lucigenin to artificially-enhanced luminescence, but it may not be specific and can interact with peroxynitrite. Coelenterazine was used in concentrations of 5-50 yM in PBS buffer to measure chemiluminescence from intact vascular rings and cells in culture (17). We found that coelenterazine is characterized by 1001000-fold higher background chemiluminescence than lucigenin (even at high concentrations). This background can be reduced 10-fold by addition of EDTA (100 yM) and desferoxamine (100 yM) and in some experiments DETC (100 yM) in the PBS buffer. Coelenterazine (10 yM) gives very high sensitivity basal chemiluminescence from vascular rings is 100-fold higher than with lucigenin. These signals are significantly inhibited by Tiron (10 mM by 40 ) but in contrast to...

Cell Culture and FACS Analysis

Solution of ethylenediamine tetraacetic acid (EDTA) (10 mM) from Gibco BRL. 6. 1X Hybridization buffer 100 mM MES, 1 M (Na+), 20 mM EDTA, 0.01 Tween-20. For 50 mL, mix 8.3 mL of 12X MES stock, 17.7 mL of 5 M NaCl, 4.0 mL of 0.5 M EDTA, 0.1 mL of 10 Tween-20, 19.9 mL of water. Store at 2-8 C and shield from light. 6. To collect the cells, remove the supernatant and put it in a 50-mL Falcon tube, add to the plate PBS containing 2 mM EDTA, pipet to collect the cells, add the recovered cells to the 50-mL tube containing the supernatant, centrifuge and resuspend the cells in a small volume of medium to count them. 5. Gently mix, spin briefly. Incubate at 16 C in a PCR block for 2 h. Add 2 L of T4 DNA polymerase and incubate 5 min at 16 C. After incubation add 10 L of 0.5 M EDTA. Store at -20 C or immediately proceed to cDNA purification using the Affymetrix cleanup module.

Antibacterial activity

Ellison et al. (1988) hypothesized that the iron-binding proteins could affect the Gram-negative outer membrane in a manner similar to that of the chelator EDTA. Further, both the whole protein and a cationic N-terminus peptide fragment directly damage the outer membrane of Gram-negative bacteria suggesting a mechanism for the supplemental effects. Several groups have also shown that LF could synergistically interact with immunoglobins, complement, and neutrophil cationic proteins against Gram-negative bacteria.

Mutations In Pka Explain How Mutations In The R Or C Subunit Of Camp-dependent Protein Kinase Pka Might Lead To A

Mutation Ras

EGTA Injection EGTA (ethylene glycol-bisQ3-amino-ethyl ether)-N,N,N',N'-tetraacetic acid) is a chelating agent with high affinity and specificity for Ca2+. By microinjecting a cell with an appropriate Ca2+-EDTA solution, an experimenter can prevent cytosolic Ca2+ from rising above 10 7 m. How would EGTA microinjection affect a cell's response to vasopressin (see Table 12-5) To glucagon

Demonstration of viral episomes and virion DNA

The electrophoresis is done in a vertical 1 agarose gel in 1 X TBE (89 mM Tris, 89 mM boric acid, 20 mM EDTA) with gel size 20 X 20 cm, 0.5 cm thick, at 4 C. The wells have an area of 0.5 cm X 0.5 cm and are 1 cm deep they are separated by 0.3-0.5 cm agarose teeth. The thick gel has a tendency to slip out from the gel plates during assembly of the gel apparatus, so the gel and the gel plates are rested on a large 3 agarose block in the lower buffer chamber. The gel system is placed in a refrigerator or cold room with no buffer in the upper chamber. TBE (1 X) for the chambers is pre-cooled. Frozen aliquots of buffers A and B (composition listed below) are prepared in advance, as Ficoll is very sticky, and the enzymes (RNase, Proteinase K) are added just before use. About 2 X 106 transformed lymphocytes are washed in PBS, resuspended in 50 xl blue sample buffer A (200 mg ml Ficoll 400,1 X TBE, 0.25 mg ml Bromophenol Blue, 50 p,g ml RNase A) and loaded into the bottom of the wells....

Iron Cobalt Interactions in

(and nickel) also stimulate erythropoeitin production, as does iron chelation with desferrioxamine. It has been proposed that the oxygen-sensing signal pathway may involve one or more haem proteins, possibly b-type cytochromes (Ehleben et al., 1998) as oxygen sensor, together with a multi-subunit assembly containing an NAD(P)H oxidase capable of producing peroxide and hydroxyl radicals (Bunn et al., 1998). The hydroxyl radicals generated by the Fenton reaction are important for triggering erythropoietin production (Ehleben et al., 1998 Porwol et al., 1998 Daghman et al., 1999). The up-regulation of erythropoietin gene transcription is mediated by the heterodimeric DNA transcription factor HIF-1 (hypoxia inducible factor 1) and the orphan nuclear receptor hNF-4 (hepatic nuclear factor 4), which bind to cognate response elements in a critical 3'-enhancer that is approximately 50 base-pairs in length. HIF-1 binding is induced by cobalt, as well as by hypoxia (Bunn et al., 1998). While...

Undiluted Sulphuric Acid Is 70 W V

4.8. 'TE' is a frequently used buffer solution for DNA and contains 10 mm Tris-HCl pH 7.5,1 mm EDTA. You have a 1m stock solution of Tris-HCl pH 7.5 and a 0.5 m stock solution of EDTA. What volume of each stock solution do you need to make 333 mL of TE buffer (b) EDTA - use the ratio method for this one 2.5 mL 0.2 m EDTA stock solution 100 mL (d) Amount of EDTA

Problems answers in Appendix 1

4.8. 'TE' is a frequently used buffer solution for DNA and contains lOmM Tris-HCl pH 7.5 and 1 mM EDTA. You have a 1 M stock solution of Tris-HCl pH 7.5 and a 0.5 M stock solution of EDTA. What volume of each stock solution do you need to make 333 mL of TE buffer 2.5 ml 0.2 M EDTA stock solution 100 mL

Puberty In Chronic Renal Failure

Cystinosis is a rare autosomal recessive disease characterized by defective extrusion of cystine from lysosomes, causing lysosomal storage and crystal formation that can lead to early renal failure, with the need for dialysis and or transplantation before puberty. Cross-sectional studies have shown marked delay in growth and pubertal development, which improves after transplantation (52) but that remains more severe than other patients matched for age, gender, puberty, and renal status (53). This suggests that toxic cystine accumulation in the testis can lead to hypergonadotrophic hypogonadism when life is prolonged by transplantation. If chelation therapy does not prevent progression to renal failure with attendant growth and pubertal delay, therapeutic trials of androgen therapy could be useful.

Role of Ca2 in Pulmonary Vasoconstriction and Pasmc Proliferation

Vasoconstriction Steps

Figure 1, Extracellular Ca2+ is required forpulmonary vasoconstriction and PASMC proliferation. A Isometric tension was measured in isolated PA rings from rats (a). Vasoconstriction was induced by applying 40 mM K+ (40K, b) or 2 jiM phenylephrine (PE, c) in the presence or absence (OCa) of 1.8 mM CaJ+. B Ca2+ dependence of the cell cycle (b). A time course (b) of human PASMC proliferation in the presence of serum (5 FBS), growth factors, and extracellular CaJ+. Chelation of extracellular Ca2+ with 2 mM EDTA inhibits PASMC proliferation (c). BM, smooth muscle basal medium GM, serum- and growth factor-supplemented growth medium. ***P

Plimstex Results for RasGDP Titrated with Mg2B

Fig. 11.4 PLIMSTEX curve for 1.5 iM Ras-GDP titrating with Mg2+. Conditions 90 D2O, 50 mM HEPES buffer, 100 mM KCl, pH 7.4, H D exchange time 3 h. EDTA was used to control Mg2+ in solution. The error bars shown for each data point were based on the deviation from two independent runs. Fig. 11.4 PLIMSTEX curve for 1.5 iM Ras-GDP titrating with Mg2+. Conditions 90 D2O, 50 mM HEPES buffer, 100 mM KCl, pH 7.4, H D exchange time 3 h. EDTA was used to control Mg2+ in solution. The error bars shown for each data point were based on the deviation from two independent runs.

Derivation of Nuclear Transfer ES Cells

Once the zona-stripped embryos are placed on MEFs they are left undisturbed for 48 h. After 48 h, the embryo explants must be monitored every day. At 72 and 96 h following explantation, a few drops of ESCM with PD98059 are added to each well of the dish. Once the embryos attach to the dish, one-half of the medium can be removed from the well and replaced with fresh medium every 24 h. Special attention should be paid to not switching the medium too soon as this can result in embryo loss. Attached embryos should be monitored every 24 h to assess outgrowth of the inner cell mass (ICM). In our experience, ICM outgrowth can take much longer for NT embryos than for fertilized embryos, and can be observed anytime between 5 and 15 days following embryo explantation. Actively growing ICMs should be picked with a mouth pipette, rinsed in hepes buffer and dispersed in 0.1 trypsin-EDTA for 10 min. Following physical dispersal of the picked ICM, cells should be plated on fresh MEFs in ESCM with...

Endocannabinoid Uptake Studies In Vitro Assay of Endocannabinoid Uptake

COS cells (107) grown to confluence in flasks in DMEM (Life Technologies, Gaithersburg, MD) containing 10 FCS (Life Technologies) were split 1 2, harvested the next day using trypsin EDTA, centrifuged (200g) for 10 min at 4 C, washed with sterile HEBS (20 mM HEPES, 137 mM NaCl, 5 mM KCl, 0.7 mM Na2HPO4, and 6 mM dextrose), recentrifuged, and resuspended at 107 cells mL in 4 C HEBS. Then, 0.9 mL of suspended cells was transfectedby electroporation at 300 V and 1100 F in 400-mm Gene Pulser cuvettes (Bio-Rad) containing 20 g of plasmid DNA and 500 g of fish sperm DNA (Boehringer-Mannheim, Mannheim, Germany) using a geneZAPPER 450 2500 (IBI, New Haven, CT).

Materials And Methods

Blood was collected after overnight fasting for at least 12 h into polypropylene vacuum tubes containing sodium ethylene diamine tetraacetate (EDTA) at a final concentration of 0.1 . Plasma was recovered after centrifugation at 4 C (10 min at 3000 x g). Sodium azide (0.01 ) and aprotinin (200 klU ml) were added immediately. Plasma aliquots were stored at 4 C and used to determine lipids and concentrations of apolipoprotein B-100 and apolipoprotein AI (apoAI). Lipid and protein constituents in plasma and lipoprotein fractions were measured as previously described.43 The EDTA content, sodium azide, and salt from the density gradient were removed using a size exclusion column (Econo-Pac 10DG, Bio-Rad Laboratories, Hercules, CA). The cholesterol and protein recovery of this procedure averaged 93 and 91 , respectively. apoAI was isolated by delipidation of freshly prepared human HDL as described by Scanu and Edelstein.45 In brief, HDL was dialyzed against 0.15 mol l NaCl, 1 mmol l EDTA, pH...

Cell Splitting

With a Pasteur pipette connected to a vacuum line, remove all the medium from the plate. Add 5 ml phosphate-buffered saline (PBS room temperature) to the cells and swirl to spread over the whole surface of the plate. With a fresh Pasteur pipette, remove the PBS and add 1 ml cold trypsin (0.05 trypsin EDTA Gibco, Rockville, MD). Thawed trypsin should be kept at 4 C at all times to prevent autodigestion and loss of activity in the enzyme. Do not warm the trypsin before applying it to cells, or the trypsin will degrade and the cells will not be appropriately dissociated for splitting. Swirl the trypsin solution to ensure complete spreading over the surface of the plate. Return the plate to the tissue culture incubator (at 37 C) for 5 min. After 5 min the cells should be easily dislodged by tapping the side of the plate. If, after tapping, most cells remain attached to the plate, swirl again to cover the cells with trypsin and return the plate to the incubator for another 5 min. Tap again...


The major complication of transfusion is iron overload, the consequences of which include diabetes mellitus, cardiac and hepatic dysfunction, growth failure, and endocrine dysfunction. Iron chelation with deferoxamine is therefore an essential component of a transfusion program. New oral iron chelators are under development however, the oral chelator deferiprone (L1) has caused significant neutropenia in DBA and should not be used. Many patients, however, find nearly daily subcutaneous chelation therapy onerous and compliance is often poor. Sustained hematologic remissions defined as stable hemoglobin levels without transfusion or steroid requirement for 6 months may occur. Only about half of steroid-responsive patients remain on prednisone for long periods of time. In summary, both chronic corticosteroid therapy and chronic transfusion therapy may lead to a number of significant immediate and long-term complications, supporting a role for HSCT. Survival of patients into adulthood in...

Cloning of ES Cells

Once colonies have become established, expand into 24-well plates seeded with MMC-treated Rosa 26 fibroblasts. To harvest individual colonies, remove medium from the relevant wells by aspiration and overlay with 100 L of PBS. Replace with 50 L of trypsin-EDTA and incubate at 37 C for 3 min.


Having both amino and phenolic functions, tetracyclines are amphoteric compounds, and are more stable in acid than under alkaline conditions. They are thus suitable for oral administration, and are absorbed satisfactorily. However, because of the sequence of phenol and car-bonyl substituents in the structures, they act as chelators and complex with metal ions, especially calcium, aluminium, iron, and magnesium. Accordingly, they should not be administered with foods such as milk and dairy products (which have a high calcium content), aluminium-and magnesium-based antacid preparations, iron supplements, etc, otherwise erratic and unsatisfactory absorption will occur. A useful feature of doxycycline and minocycline is that their absorptions are much less affected by metal ions. Chelation of tetracyclines with calcium also precludes their use in children developing their adult teeth, and in pregnant women, since the tetracyclines become deposited in the growing teeth and bone. In...


Mackle et al., 1991 Ward et al., 1994, 2000). The transformation of ferrihydrite to goethite (see Chapter 1) would require solubilization and reprecipitation. That desferrioxamine chelation therapy might have contributed to this transformation, as originally hypothesized (Ward et al., 1992), seems unlikely in the light of studies on haemosiderin isolated from thalassaemic patients untreated with chelators (Ward et al.,1994), and from a marine mammal, Dugong dugong (Chua-anusorn et al., 1994). Both have goethite as the predominant mineral phase. Prolonged centrifuga-tion in potassium iodide enables a non-ferritin, non-haemosiderin fraction termed prehaemosiderin to be isolated the structure of its iron cores resembled that of the corresponding haemosiderins, i.e. goethite-like in thalassaemia and ferrihydrite-like in the other conditions (Ward et al., 1994). This implies that there may be multiple mechanisms of haemosiderin formation, and that the intrinsic toxicity of haemosiderin...


Hybridization buffer 50 formamide, 10 mM Tris-HCl pH 8, 200 g ml tRNA (RNase-free), 1X Denhardt's solution, 10 dextran sulfate, 600 mM NaCl, 0.25 SDS and 1 mM EDTA pH 8 stored at 4 C , is preheated to 85 C for 10 min. The probe is diluted 1 20 in this preheated hybridization buffer, then heated at 85 C for 5 min followed by abrupt chill in icy water for over 5 min (to maintain the probe in an open conformation). The sections are then covered with the diluted probe at 150 l per slide ( 1.2 x 108 cpm) and overlaid with a piece of Parafilm precut to the size of the slide. (Bubbles should be avoided to prevent areas of non-hybridization). The slides are then placed on several layers of Whatman paper, previously wet by 50 formamide, in a box and placed within a 55 C incubator overnight.

Contrast Agents

Paramagnetic ions with a number of unpaired electrons such as Gd3+ and Mn2+ are frequently used as MRI contrast agents because of their high relaxivities. To reduce the toxicity of these ions for in vivo applications, they are usually chelated to special molecules. Gd-DTPA, the best known MRI contrast agent, is a chelate composed of gadolinium ions and diethylenetriaminepentaacetic acid (DTPA). Because chelation of gadolinium ions decreases the effective amount of water molecules that can directly interact with the paramagnetic ions, the i i and R2 relaxivities of Gd-DTPA are smaller than the corresponding relaxivities of free gadolinium ion. The reported Rx and R2 relaxivities of Gd-DTPA at 0.5-1.5 Tesla are approximately 4.5kg mmol'1 s_1 and 6.0kg mmol-1 s-1, respectively 11 . Gd-DTPA is typically administered at a dose of 0.1-0.2 mmol kg.


Glucose as the sole substrate cannot support mouse embryo development prior to the late 4- early 8-cell stage (22,85). This inability to utilize glucose as an energy source during the first three cell cycles has been attributed to a blockade in glycolysis (86-88). Studies on the mouse (16), hamster (89), sheep (90), cattle (91-93), and human (19,79) have all demonstrated that glucose in the presence of phosphate is responsible for the retardation or developmental arrest of cleavage stage embryos in culture. This has been attributed to the premature stimulation of glycolysis, a phenomenon similar to the Crabtree effect (7,94-98). The Crabtree effect, as described in tumor cells in culture, depends on the continued activity of hexokinase in the presence of increasing product, glucose-6-phosphate. The isozyme of hexokinase present in these cells must, therefore, be a form of the enzyme that is not completely inhibited by glucose-6-phosphate. Kinetic analysis of hexokinase in...


The addition of chelators of heavy metal ions to culture media has been reported to enhance the development of pre-implantation embryos in vitro. Addition of EDTA to the culture media increases the development of mouse zygotes beyond the 2-cell stage and increases development to the blastocyst stage (16,24,105,153,154). However, the stimulatory effect of EDTA was only evident at concentrations between 10 mM and 150 mM, whereas a concentration of 200 mM inhibited development to the blastocyst (155). A recent report on the human embryo showed that the inclusion of EDTA to medium HTF without glucose and phosphate significantly increased the development of zygotes to the blastocyst stage in vitro (19). In light of these studies many new media formulated for the development of mammalian embryos in culture such as CZB (16), KSOM (17,25,56), G1 (37), and mHTF (19) now contain EDTA. A commercially available medium supplement, SSR2 from MediCult contains a chelation system of 4.3 mM EDTA...

Iron Chelators

Can iron restriction be used as a therapeutic measure to prevent or eliminate infections without compromising the host organism At present, the only iron chelator widely available for clinical use is desferrioxamine (DFO), which is very efficient in preventing clinical consequences in thalassaemic patients (Brittenham,1992). Has this drug any antiinfectious potential This question on its potential usefulness against infection should be answered at three levels (i) its in vitro effect on the growth of microorganisms (ii) its in vivo effect on the course of experimental infections and most importantly, (iii) its effect on clinical infections in humans. DFO is indeed able to suppress the in vitro growth and to protect against experimental infections caused by several microbes (Boelaert etal., 1993b). On the other hand, one should not forget that a limited number of microorganisms can utilize the iron from ferrioxamine to enhance their growth, as discussed in Section 1 of this chapter....


Upper urinary tract morphology and function are studied with IVP and serum creatinine or, if in doubt about renal function, with method giving the glomerular filtration rate (GFR). Most centres in Scandinavia are using 51Cr-EDTA or iohexol for this purpose. These methods do not overestimate GFR in patients with intestine incorporated in the urinary tract. Sometimes a scintillation camera renography is valuable to determine the separate GFR and to evaluate obstruction.

The Labile Iron Pool

We have seen in Chapter 5 that extracellular iron can be taken up by various routes (i) from transferrin, via its receptor mediated pathway (ii) from transferrin, by the receptor independent pathway (iii) from ferritin (iv) from non-transferrin bound iron (v) from other sources (like haem, in one of its many forms). Once it has been taken up by cells it enters a pool of labile, cytosolic iron. This iron is available for haem synthesis and for iron incorporation into iron-dependent enzymes and ferritin. Enlargement of this pool stimulates ferritin synthesis. Iron also enters this transit pool not only from outside the cell, but also as a result of endogenous haem breakdown and the mobilization of ferritin iron. As we will see in Chapter 10, this is the pool of intracellular iron that we suspect is responsible for oxygen-mediated iron toxicity. It is generally thought that this pool is of low molecular weight, and that it is probably the major site of iron chelation by chelators such as...

Major Cycles

Jpg Organic Matter Plant Cycle

In the absence of biota, the rate and direction of chemical fluxes would be controlled solely by the physical and chemical factors determining exchanges between abiotic pools. Chemicals would be retained at a site only to the extent that chelation or concentration gradients restricted leaching or diffusion. Exposed nutrients would continue to move with wind or water (erosion). Biotic uptake and storage of chemical resources creates a biotic pool that reduces chemical storage in abiotic pools, altering rates of exchange among abiotic pools and restricting movement of nutrients across chemical and topographic gradients. For example, the uptake and storage of atmospheric CO2 by plants (including long-term storage in fossil biomass, i.e., coal, oil and gas) and the uptake and storage of calcium carbonate by marine animals (and deposition in marine sediments) control concentration gradients of CO2 available for exchange between the atmosphere and ocean...

Synergistic effect

Ellison et al. (1990) studied the ability of LF and TF to damage the Gram-negative outer membrane. Lipopolysaccharide (LPS) release by the proteins could be blocked by concurrent addition of Ca2+ and Mg2+. Addition of Ca2+ also blocked the ability of LF to increase the susceptibility of i , coli to rifampicin. TF, but not LF, increased susceptibility of Gram-negative bacteria to deoxycholate, with reversal of sensitivity occurring with exposure to Ca2+ or Mg2+. In transmission electron microscopy studies polymyxin B caused finger-like membrane projections, but no morphological alterations were seen in cells exposed to EDTA, LF or TF. These data provide further evidence that LF and TF act as membrane-active agents with the effects modulated by Ca2+ and Mg2+.

Cation ic effect

LF was found to contain an antimicrobial sequence near its N-terminus, which appears to function by a mechanism distinct from iron chelation. The identified domain contains a high proportion of basic residues, like various other antimicrobial peptides known to target microbial membranes and it appears to be located on the surface of the folded protein allowing its interaction with surface components of microbial cells (Tomita et al, 1994).