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Vestal B, Russell P, Radcliffe R, Bemis L, Saba L, Kechris K. miRNA-regulated transcription associated with mouse strains predisposed to hypnotic effects of ethanol. Brain Behav 2018; 8:e00989. [PMID: 30106247 PMCID: PMC5991579 DOI: 10.1002/brb3.989] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Revised: 01/18/2018] [Accepted: 03/24/2018] [Indexed: 12/20/2022] Open
Abstract
INTRODUCTION Studying innate sensitivity to ethanol can be an important first step toward understanding alcohol use disorders. In brain, we investigated transcripts, with evidence of miRNA modulation related to a predisposition to the hypnotic effect of ethanol, as measured by loss of righting reflex (LORR). METHODS Expression of miRNAs (12 samples) and expression of mRNAs (353 samples) in brain were independently analyzed for an association with LORR in mice from the LXS recombinant inbred panel gathered across several small studies. These results were then integrated via a meta-analysis of miRNA-mRNA target pairs identified in miRNA-target interaction databases. RESULTS We found 112 significant miRNA-mRNA pairs where a large majority of miRNAs and mRNAs were highly interconnected. Most pairs indicated a pattern of increased levels of miRNAs and reduced levels of mRNAs being associated with more alcohol-sensitive strains. For example, CaMKIIn1 was targeted by multiple miRNAs associated with LORR. CAMK2N1 is an inhibitor of CAMK2, which among other functions, phosphorylates, or binds to GABAA and NMDA receptors. CONCLUSIONS Our results suggest a novel role of miRNA-mediated regulation of an inhibitor of CAMK2 and its downstream targets including the GABAA and NMDA receptors, which have been previously implicated to have a role in ethanol-induced sedation and sensitivity.
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MESH Headings
- Alcoholism/genetics
- Animals
- Calcium-Calmodulin-Dependent Protein Kinase Type 2/antagonists & inhibitors
- Ethanol/pharmacology
- Female
- GABA-A Receptor Antagonists/pharmacology
- Gene Expression Regulation
- Genetic Predisposition to Disease/genetics
- Hypnotics and Sedatives/pharmacology
- Mice
- Mice, Inbred Strains
- MicroRNAs/genetics
- MicroRNAs/metabolism
- MicroRNAs/physiology
- RNA, Messenger/metabolism
- Receptors, GABA-A/drug effects
- Receptors, GABA-A/genetics
- Receptors, N-Methyl-D-Aspartate/antagonists & inhibitors
- Receptors, N-Methyl-D-Aspartate/drug effects
- Receptors, N-Methyl-D-Aspartate/genetics
- Reflex, Righting/drug effects
- Reflex, Righting/genetics
- Transcription, Genetic/genetics
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Affiliation(s)
- B. Vestal
- Center for Genes, Environment and HealthNational Jewish HealthDenverColorado
- Department of Biostatistics and InformaticsUniversity of Colorado Denver Anschutz Medical CampusAuroraColorado
| | - P. Russell
- Department of Biostatistics and InformaticsUniversity of Colorado Denver Anschutz Medical CampusAuroraColorado
| | - R.A. Radcliffe
- Department of Pharmaceutical SciencesUniversity of Colorado Denver Anschutz Medical CampusAuroraColorado
| | - L. Bemis
- Department of Biomedical SciencesUniversity of Minnesota Medical School Duluth CampusDuluthMinnesota
| | - L.M. Saba
- Department of Pharmaceutical SciencesUniversity of Colorado Denver Anschutz Medical CampusAuroraColorado
| | - K. Kechris
- Department of Biostatistics and InformaticsUniversity of Colorado Denver Anschutz Medical CampusAuroraColorado
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Fletcher DJ, Brainard BM, Epstein K, Radcliffe R, Divers T. Therapeutic plasma concentrations of epsilon aminocaproic acid and tranexamic acid in horses. J Vet Intern Med 2013; 27:1589-95. [PMID: 24118238 DOI: 10.1111/jvim.12202] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 06/17/2013] [Accepted: 08/20/2013] [Indexed: 11/28/2022] Open
Abstract
BACKGROUND Antifibrinolytic drugs such as epsilon aminocaproic acid (EACA) and tranexamic acid (TEA) are used to treat various bleeding disorders in horses. Although horses are hypofibrinolytic compared to humans, dosing schemes have been derived from pharmacokinetic studies targeting plasma concentrations in humans. HYPOTHESIS/OBJECTIVES We hypothesized therapeutic plasma concentrations of antifibrinolytic drugs in horses would be significantly lower than in humans. Our objective was to use thromboleastography (TEG) and an in vitro model of hyperfibrinolysis to predict therapeutic concentrations of EACA and TEA in horses and humans. ANIMALS Citrated plasma collected from 24 random source clinically healthy research horses. Commercial pooled human citrated plasma with normal coagulation parameters was purchased. METHODS Minimum tissue plasminogen activator (tPA) concentration to induce complete fibrinolysis within 10 minutes was determined using serial dilutions of tPA in equine plasma. Results used to create an in vitro hyperfibrinolysis model with equine and human citrated plasma, and the minimum concentrations of EACA and TEA required to completely inhibit fibrinolysis for 30 minutes (estimated therapeutic concentrations) determined using serial dilutions of the drugs. RESULTS Estimated therapeutic concentrations of EACA and TEA were significantly lower in horses (5.82; 95% CI 3.77-7.86 μg/mL and 0.512; 95% CI 0.277-0.748 μg/mL) than in humans (113.2; 95% CI 95.8-130.6 μg/mL and 11.4; 95% CI 8.62-14.1 μg/mL). CONCLUSIONS AND CLINICAL IMPORTANCE Current dosing schemes for EACA and TEA in horses may be as much as 20× higher than necessary, potentially increasing cost of treatment and risk of adverse effects.
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Affiliation(s)
- D J Fletcher
- Department of Clinical Sciences, Cornell University College of Veterinary Medicine, Ithaca, NY
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Radcliffe R. Need for a new kind of partnership on animal health. Vet Rec 2010; 167:983. [PMID: 21262717 DOI: 10.1136/vr.c7198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
The report from the England Advisory Group on Responsibility and Cost Sharing recommends a new approach built around the idea of an England Partnership Board. Rosemary Radcliffe, the group's chair, gives her perspective.
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Erwin VG, Radcliffe R, Deitrich RA. Neurotensin levels in specific brain regions and hypnotic sensitivity to ethanol and pentobarbital as a function of time after haloperidol administration in selectively bred rat lines. J Pharmacol Exp Ther 2001; 299:698-704. [PMID: 11602683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023] Open
Abstract
Evidence indicates that sensitivity to ethanol is a good predictor of the development of alcoholism. Thus, identification of neuronal processes that regulate ethanol sensitivity has been the subject of much recent research. The present studies were designed to further test the hypothesis that neurotensinergic processes mediate, in part, hypnotic sensitivity to ethanol. Single doses of haloperidol were administered to lines of rats [selectively bred for high and low sensitivity (HAS and LAS, respectively) to hypnotic effects of ethanol] to produce increases in neurotensin (NT) levels in brain regions. At 20 h after administration, haloperidol produced dose-dependent increases in NT immunoreactivity levels in nucleus accumbens (NA) and caudate putamen (CP) in both HAS and LAS lines. Levels of NT in NA and CP returned to control values at 48 h after 4 mg/kg haloperidol. These studies used two measures of hypnotic sensitivity to ethanol: duration of loss of righting reflex (sleep time) and blood ethanol concentration at regain of righting reflex (BECRR). At 20 h, but not 48 h, after haloperidol treatment, both HAS and LAS rats displayed increases in ethanol-induced sleep time with concomitant decreases in BECRR. Pentobarbital-induced sleep time was not increased 20 h after administration of 4 mg/kg haloperidol; however, hypnotic sensitivity to both pentobarbital and ethanol was increased by acute (30-min) pretreatment with 1 mg/kg. These results suggest that NT levels in NA, acting via NT receptors, enhance hypnotic sensitivity to ethanol, but not pentobarbital.
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Affiliation(s)
- V G Erwin
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Colorado Health Science Center, Denver, 80262, USA.
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Knight LC, Radcliffe R, Maurer AH, Rodwell JD, Alvarez VL. Thrombus imaging with technetium-99m synthetic peptides based upon the binding domain of a monoclonal antibody to activated platelets. J Nucl Med 1994; 35:282-8. [PMID: 8295000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
UNLABELLED Monoclonal antibodies which recognize fibrin or platelets have enabled imaging of vascular thrombi, however, early imaging has been difficult because of the slow blood disappearance of even small antibody fragments. It was theorized that it might be possible to synthesize peptides which possess the same thrombus affinity as monoclonal antibodies, but which would leave the blood pool much more rapidly. METHODS In this study, peptides were synthesized with amino acid sequences based on the primary binding region of the platelet glycoprotein IIb/IIIa-directed monoclonal antibody PAC1. Both termini of the peptides were blocked to prevent rapid proteolysis and a metallothionein-derived sequence was incorporated as a chelating agent for reduced technetium. RESULTS Technetium-99m-labeled peptides produced images of fresh clots in the jugular veins of rabbits and day-old thrombi in the femoral veins of dogs within 2 hr after injection. In control experiments, a 99mTc-labeled nonspecific peptide failed to produce focal images of thrombus. Another control compound, 99mTc-glucoheptonate, did produce images of fresh clots in rabbits but failed to produce focal images of day-old thrombi. As was hoped, blood clearance of the 99mTc peptides was rapid, with excretion through the kidneys, however, none of the peptides studied had better thrombus-to-blood ratios than iodinated fibrinogen and all had significantly lower deposition in the thrombus. CONCLUSION Using labeled synthetic peptides appears to be technically feasible but the absolute binding to thrombus is not yet sufficient for reliable imaging of pre-existing thrombi.
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Affiliation(s)
- L C Knight
- Nuclear Medicine Department, Temple University School of Medicine, Philadelphia, PA 19140
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Abstract
Levels of endogenous neurotensin (NT-IR) in the LS x SS RI strains differed by 3.0-, 4.7-, 5.4-, and 6.9-fold in the ventral midbrain (VMB), hypothalamus (HY), nucleus accumbens (NA), and caudate putamen (CP), respectively. Frequency distributions and estimates of the number of genes indicate that differences in NT-IR are polygenically influenced. The NT-IR levels in NA and CP were significantly correlated, but levels in the VMB did not correlate with those in the NA or CP. Specific binding to either low (NTL)- or high (NTH)-affinity receptors as measured in the absence or presence of levocabastine differed significantly in brain regions from among LS X SS mouse strains. Results indicate a polygenic influence mediating the differences in receptor densities and suggest differences in genetic regulation of NTL and NTH receptors.
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Affiliation(s)
- V G Erwin
- Alcohol Research Center, School of Pharmacy, University of Colorado, Health Sciences Center, Denver 80262
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Erwin VG, Campbell AD, Radcliffe R. Effects of chronic ethanol administration on neurotensinergic processes: correlations with tolerance in LS and SS mice. Ann N Y Acad Sci 1992; 654:441-3. [PMID: 1321578 DOI: 10.1111/j.1749-6632.1992.tb25992.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- V G Erwin
- Alcohol Research Center, School of Pharmacy, University of Colorado, Boulder 80309-0297
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Abstract
Lines of mice selected for differential initial sensitivity to the anesthetic effects of ethanol also differ in their locomotor responses to lower doses of ethanol. Sixteen recombinant inbred strains of mice derived from long-sleep (LS) and short-sleep (SS) selected lines as well as inbred LS and SS mice were used in a genetic correlational study to investigate possible associations between high-dose and low-dose indices of initial sensitivity to ethanol. Measurements of high-dose (4.1 g/kg) effects of ethanol were hypothermia, sleep time, and blood ethanol content at regaining of righting response, and the index of low-dose (1.875 g/kg) sensitivity was distance traveled during a 5-min period immediately following intraperitoneal injection with ethanol. The results indicated wide genetic variation in hypothermia and ethanol-induced locomotor activation in a manner consistent with polygenic influence. Furthermore, correlations between low-dose locomotor activity and hypnotic dose effects tended to be low and nonsignificant, indicating independence of inherited mechanisms underlying high- and low-dose ethanol sensitivity.
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Affiliation(s)
- V G Erwin
- Alcohol Research Center, School of Pharmacy, University of Colorado, Boulder 80309
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Abstract
Studies were designed to examine the previously proposed hypothesis that some of the pharmacological actions of ethanol are mediated by neurotensinergic processes. Neurotensin-immunoreactivity (NT-ir) was extracted from various brain regions and shown by high performance liquid chromatography to possess the same retention time as authentic bovine NT1-13. The highest levels of NT-ir were observed in the hypothalamus with intermediate levels in the midbrain and striatum and lowest levels in the frontal cortex. Levels of NT-ir were higher in hypothalamus and midbrain from long-sleep (LS) than from short-sleep (SS) mice. Ethanol, in vivo, produced a dose-dependent decrease in NT-ir in several brain regions; low doses, 1.5 to 3.0 g/kg, but not high doses, 4.1 g/kg, of ethanol significantly decreased NT-ir in hypothalamus, midbrain, and striatum of LS and SS mice. Levels of NT-ir in the frontal cortex were not altered by ethanol administration. Ethanol-induced decreases in NT-ir were of rapid onset with a maximum decrease in 5 min after intraperitoneal (i.p.) injection, and they were of long duration with levels remaining depressed for 4 hr. These findings show that subhypnotic, intoxicating doses of ethanol enhance NT release, in vivo, and support the hypothesis that some of ethanol's actions are mediated by neurotensinergic systems.
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Affiliation(s)
- V G Erwin
- Alcohol Research Center, School of Pharmacy, University of Colorado, Boulder 80309
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Radcliffe R. Points: Mind How You Go! West J Med 1984. [DOI: 10.1136/bmj.288.6417.646-g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Radcliffe R. A critical role of lysine residues in the stimulation of tissue plasminogen activator by denatured proteins and fibrin clots. Biochim Biophys Acta 1983; 743:422-30. [PMID: 6403038 DOI: 10.1016/0167-4838(83)90401-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Two-chain 70 000-dalton plasminogen activator of tissue origin displays only weak activity toward plasminogen in a two-component system. The rate of activation is enhanced a minimum of 50-fold by the presence of fibrin clots or denatured proteins. The stimulation must depend on both chemical determinants and spatial configuration, since native proteins, including fibrinogen, lack significant stimulatory activity. These studies employed chemical modifications of four stimulatory proteins (fibrin, denatured fibrinogen, denatured IgG and denatured ovalbumin) to identify a critical role for lysine residues. Arginine, aspartic acid, cysteine, cystine, glutamic acid, histidine, methionine, tyrosine and tryptophan were found not to be essential. The critical spatial determinant(s) remain(s) unknown.
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Radcliffe R, Heinze T. Stimulation of tissue plasminogen activator by denatured proteins and fibrin clots: a possible additional role for plasminogen activator? Arch Biochem Biophys 1981; 211:750-61. [PMID: 6458244 DOI: 10.1016/0003-9861(81)90512-9] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Comp PC, Jacocks RM, Rubenstein C, Radcliffe R. A lysine-absorbable plasminogen activator is elevated in conditions associated with increased fibrinolytic activity. J Lab Clin Med 1981; 97:637-45. [PMID: 6783711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A plasminogen activator, or class of activators, that absorbs to lysine-agarose is present in human plasma. We have developed a quantitative assay for this plasminogen activator. The assay involves removal of the activator from plasma with lysine-agarose affinity columns and subsequent measurement of the activity by the conversion of plasminogen to plasmin on standardized fibrin agar plates. Using this assay, we investigated three physiologic conditions that have in the past been associated with increased fibrinolytic activity to determine whether elevation of the LAPA was involved. Normal individuals undergoing strenuous physical exercise and others subjected to venous occlusion as well as patients with cirrhosis of the liver were examined. Treadmill exercise to maximal exertion produced up to 15-fold increases in the level of LAPA; venous occlusion produced similar elevation. Certain individuals did not show increase fibrinolytic activity in response to exercise or venous occlusion, as indicated by unchanged euglobulin lysis times. These fibrinolytic hyporesponders did not show an elevation of their LAPA levels. In the third group examined, patients with cirrhosis, 24 of 62 had elevated levels of LAPA. Supplementation of plasma from normal individuals with this plasminogen activator from exercised individuals and cirrhotics resulted in increased rates of clot lysis.
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Radcliffe R, Bagdasarian A, Colman R, Nemerson Y. Activation of bovine factor VII by hageman factor fragments. Blood 1977; 50:611-7. [PMID: 561632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
During the early events of coagulation of human blood by the intrinsic pathway, factor XII is activated to a form which can activate factor XI, and is proteolytically fragmented to smaller species (30,000 daltons and 70,000 daltons) which have lost most of the ability to activate factor XI but which can activate prekallikrein rapidly. The effect of these fragments on factor VII was studied. It was found that these Hageman factor fragments promoted rapid proteolysis of one-chain factor VII to a more active two-chain form. The amino-terminal sequences of the chains of activated factor VII were found to be Ala-Asx-Gly- and Ile-Val-Gly-, the same as were earlier observed after activation of factor VII by activated factor X. This finding indicates that initiation of coagulation by the intrinsic pathway also primes the extrinsic pathway.
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Radcliffe R, Nemerson Y. Mechanism of activation of bovine factor VII. Products of cleavage by factor Xa. J Biol Chem 1976; 251:4749-802. [PMID: 956165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Coagulation Factor VII from bovine plasma is a glycoprotein containing a single peptide chain. The NH2-terminal sequence of Ala-Asx-Gly-Phe-Leu- is homologous with the NH2 termini of prothrombin, Factor IX, and the light chain of Factor X. Factor Xa in the presence of calcium ions and phospholipid cleaves Factor VII at an Arg-Ile bond in the sequence Arg-Ile-Val-Gly-Gly-, producing a two-chain molecule with at least 85 times the coagulant activity of single-chain Factor VII and a new NH2-terminal sequence homologous with the corresponding chains of thrombin, Factor IXa and Factor Xa. A second slower cleavage at an Arg-Gly bond destroys Factor VII activity. Bovine Factor VII, unlike prothrombin, Factor IX, and Factor X, is rapidly inhibited by diisopropylphosphorofluoridate (iPr2PF). [3H]iPr2PF is readily incorporated into one-chain, two-chain, and three-chain forms of Factor VII up to ratios of approximately 0.9 moles of [3H]diisopropylphosphate per mole of protein. The radioactive peptides generated from each form of [32P]iPr2PF-inhibited Factor VII by tryptic and thermolytic digestion were found to migrate together on paper electrophoresis. This indicates that the iPr2PF is incorporated stoichiometrically into the same specific site in each form.
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Radcliffe R, Nemerson Y. Activation and control of factor VII by activated factor X and thrombin. Isolation and characterization of a single chain form of factor VII. J Biol Chem 1975; 250:388-95. [PMID: 234427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Factor VII purified as previously described, was found to consist of two polypeptide chains joined by disulfide bridges. We now report the isolation and 200,000-fold purification of a single chain form of Factor VII. This was accomplished by protecting the molecule against proteolysis by including benzamidine during the entire purification. The purification was essentially as previously reported except that barium cirtate was substituted for barium sulfate as an absorbant for Factor VII as it resulted in a 4-fold increase in yield. Single chain Factor VII is rapidly hydrolyzed by Factor Xa in the presence of calcium ions and phospholipids, and by thrombin, to a two-chain form which possesses at least 85 times the Factor VII clotting activity of the single chain species. The two-chain form of the enzyme requires tissue factor in order to activate Factor X. From the observed rates of activation of Factor VII by Xa in the presence of calcium ions and phospholipids, it was calculated that at approximately physiological concentration, Factor VII activity would increase at an initial rate of 20-fold per min; this reaction is sufficiently rapid to constitute a feedback control mechanism. The action of thrombin is approximately 40-fold slower under these conditions. Diisopropylphosphorofluoridate inactivates the single chain and two-chain forms of Factor VII at approximately equal rates. After inhibition, the single chain species could be cleaved but not activated by proteolysis.
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Radcliffe R, Nemerson Y. Activation and control of factor VII by activated factor X and thrombin. Isolation and characterization of a single chain form of factor VII. J Biol Chem 1975. [DOI: 10.1016/s0021-9258(19)41912-1] [Citation(s) in RCA: 139] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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