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Sawalha AH, Kaufman KM, Kelly JA, Adler AJ, Aberle T, Kilpatrick J, Wakeland EK, Li QZ, Wandstrat AE, Karp DR, James JA, Merrill JT, Lipsky P, Harley JB. Genetic association of interleukin-21 polymorphisms with systemic lupus erythematosus. Ann Rheum Dis 2007; 67:458-61. [PMID: 17720724 DOI: 10.1136/ard.2007.075424] [Citation(s) in RCA: 147] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
OBJECTIVE The aetiology of systemic lupus erythematosus (SLE) is incompletely understood. Both genetic and environmental factors are implicated in the pathogenesis of the disease. Herein, we describe genetic association between SLE and polymorphisms in the interleukin (IL)-21 gene. The reported effect of IL-21 on B-cell differentiation into plasma cells and its effect on dendritic cell maturation and T-cell responses make IL-21 an attractive candidate gene for SLE. METHODS Three single nucleotide polymorphisms (SNPs) in the IL-21 gene were genotyped in a total of 2636 individuals (1318 cases and 1318 controls matched for age, sex and race). Population-based case-control association analyses were performed. RESULTS We found a genetic association with SLE and two SNPs located within the IL-21 gene (rs907715: chi(2) = 11.55, p<0.001; rs2221903: chi(2) = 5.49, p = 0.019). Furthermore, genotypes homozygous for the risk alleles were more frequent than genotypes homozygous for the non-risk alleles in European-American patients as compared to controls (rs907715 (GG versus AA): odds ratio (OR) = 1.66, p = 0.0049; rs2221903 (GG versus AA): OR = 1.60, p = 0.025). CONCLUSION Our findings indicate that IL-21 polymorphism is a candidate association with SLE. The functional effects of this association, when revealed, might improve our understanding of the disease and provide new therapeutic targets.
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Affiliation(s)
- A H Sawalha
- US Department of Veterans Affairs Medical Center, Oklahoma City, Oklahoma, USA.
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Namjou B, Kelly JA, Kilpatrick J, Kaufman KM, Harley JB. 30 LINKAGE AT 5Q14.3-15 IN PEDIGREES MULTIPLEX FOR SYSTEMIC LUPUS ERYTHEMATOSUS STRATIFIED BY AUTOIMMUNE THYROID DISEASE. J Investig Med 2005. [DOI: 10.2310/6650.2005.00006.29] [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: 11/18/2022]
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Nath SK, Namjou B, Garriott CP, Frank S, Joslin PA, Kilpatrick J, Kelly JA, Harley JB. Linkage analysis of SLE susceptibility: confirmation of SLER1 at 5p15.3. Genes Immun 2004; 5:209-14. [PMID: 15014430 DOI: 10.1038/sj.gene.6364060] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We detected a novel susceptibility gene, SLER1, for systemic lupus erythematosus (SLE) at 5p15.3.(1) This finding was based on a selected subgroup of SLE families, where two or more family members have had alleged rheumatoid arthritis (SLE-RA). The main objective of this study was to replicate the linkage at 5p15.3 based on an independent data set of 88 SLE-RA families. Heterogeneity in the genetic model led us to use a nonparametric allele-sharing method. Since our a priori hypothesis of linkage at 5p15.3 was fixed, we genotyped six markers at the linked region. Our new results replicate the initial linkage at 5p15.3 (Zlr=2.58, P<0.005, LOD=1.45). Moreover, evidence of linkage was sustained when analysis was restricted to the subset of SLE families who had 3 or more individuals with alleged RA (Zlr=3.32, P=0.008, LOD=2.40) The results of our previous findings, together with these new results, confirm the SLER1 linkage at 5p15.3. Our results also demonstrate the utility of clinically defined subgroup analysis for detecting susceptibility loci for complex genetic diseases, such as SLE.
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Affiliation(s)
- S K Nath
- Arthritis and Immunology Research Program, Oklahoma City, OK, USA.
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Quintero-Del-Rio AI, Kelly JA, Kilpatrick J, James JA, Harley JB. The genetics of systemic lupus erythematosus stratified by renal disease: linkage at 10q22.3 (SLEN1), 2q34-35 (SLEN2), and 11p15.6 (SLEN3). Genes Immun 2002; 3 Suppl 1:S57-62. [PMID: 12215904 DOI: 10.1038/sj.gene.6363901] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Renal disease occurs in 40-75% of systemic lupus erythematosus (SLE) patients and significantly contributes to morbidity and mortality. We used two pedigree stratification strategies to explore the impact of the ACR renal criterion for SLE classification upon genetic linkage with SLE. In both we used SLE as the phenotype. First, we evaluated genome scan data from >300 microsatellite markers in the 75 pedigrees that had at least one SLE affected with the SLE renal criterion. A maximum-likelihood parametric model approach produced a maximum screening LOD score of 3.16 at 10q22.3 in the European-American (EA) pedigrees. The African-American (AA) pedigrees obtained a maximum screening LOD score of 2.58 at 11p15.6. A multipoint sib-pair regression analysis produced P = 0.0000008 in EA at 10q22.3 (SLEN1) and P = 0.000001 in AA at 2q34-35 (SLEN2). A second stratification strategy explored the renal criterion in 35 pedigrees with two or more SLE patients with renal disease and produced a LOD score of 3.34 at 11p15.6 in AA (SLEN3). Sib-pair analysis in these 35 pedigrees revealed P = 0.00003 at 4q13.1 in EA, P = 0.00003 at 11p13 and 0.00007 at 3q23 in AA. Thus, multiple genetic linkages are related to the renal criterion in SLE. Of the significant genetic linkages with SLE described herein, those at 10q22.3 in the EA pedigrees (SLEN1) and at 2q34-35 in the AA pedigrees (SLEN2) have not been previously described.
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Affiliation(s)
- A I Quintero-Del-Rio
- Arthritis and Immunology Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104, USA.
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Sawalha AH, Namjou B, Nath SK, Kilpatrick J, Germundson A, Kelly JA, Hutchings D, James J, Harley J. Genetic linkage of systemic lupus erythematosus with chromosome 11q14 (SLEH1) in African-American families stratified by a nucleolar antinuclear antibody pattern. Genes Immun 2002; 3 Suppl 1:S31-4. [PMID: 12215899 DOI: 10.1038/sj.gene.6363904] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2001] [Revised: 05/06/2002] [Accepted: 05/20/2002] [Indexed: 11/09/2022]
Abstract
Systemic lupus erythematosus (SLE) is an autoimmune disease with complex genetics. We evaluated pedigrees multiplex for SLE that had an affected with antinucleolar antibodies to increase the homogeneity for genetic linkage analysis. We found a significant linkage effect on chromosome 11q14 at marker D11S2002 in African-American Pedigrees. This effect produced a maximum LOD score of 5.62 using a dominant inheritance model with 95% penetrance in males and 99% penetrance in females. The results were supported by multipoint linkage analysis. Fine mapping of the region with two additional markers within 6 cM of D11S2002 further provided evidence of linkage in this region. Linkage at D11S2002, named SLEH1, was previously found in some of these same African-American pedigrees multiplex for SLE, but who were stratified by hemolytic anemia (Kelly et al, submitted). In conclusion, an important SLE susceptibility gene, SLEH1 at 11q14, is identified in African-Americans when stratifying pedigrees by antinucleolar autoantibodies.
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Affiliation(s)
- A H Sawalha
- Department of Medicine, University of Oklahoma Health Sciences Center, OK, USA
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Namjou B, Nath SK, Kilpatrick J, Kelly JA, Reid J, Reichlin M, James JA, Harley JB. Genome scan stratified by the presence of anti-double-stranded DNA (dsDNA) autoantibody in pedigrees multiplex for systemic lupus erythematosus (SLE) establishes linkages at 19p13.2 (SLED1) and 18q21.1 (SLED2). Genes Immun 2002; 3 Suppl 1:S35-41. [PMID: 12215900 DOI: 10.1038/sj.gene.6363905] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2001] [Revised: 05/15/2002] [Accepted: 05/15/2002] [Indexed: 11/09/2022]
Abstract
Anti-double-stranded DNA (anti-dsDNA) is arguably one of the most specific autoantibodies in systemic lupus erythematosus (SLE). This antibody is associated with more severe SLE and with glomerulonephritis. From 196 pedigrees multiplex for SLE, we selected those that had any SLE affected positive for anti-dsDNA by the Crithidia luciliae kinetoplast imunofluorescence assay. This stratification strategy tested the hypothesis that anti-dsDNA would identify a more genetically homogeneous group of pedigrees, in which previously undetected linkage effects could be established. A genome screen data for linkage to SLE was available at 307 microsatellite markers for this selected group of 71 pedigrees: 37 European-American, 29 African-American, and five others. The most significant results were obtained at 19p13.2 (LOD(max) = 4.93), named SLED1, in the 37 European-American pedigrees using a dominant model with mixed penetrances (92% for females and 49% for males) at 100% homogeneity (theta = 0). A second linkage effect, SLED2, was established in the 29 African-American pedigrees at 18q21.1 (LOD(max) = 3.40) using a recessive model with 100% penetrance (theta = 0.1). Parametric and non-parametric multipoint analyses were performed, which provided further evidence and support of susceptibility genes residing in these regions. In conclusion, two powerful linkages have been detected with SLE based on the presence of anti-dsDNA. These findings show SLE to be a richly complicated disease phenotype that is now ripe for important new discovery through a genetic approach.
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Affiliation(s)
- B Namjou
- Arthritis and Immunology Research Program, Oklahoma Medical Research Foundation, OK 73104, USA
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McCann UG, Schiller HJ, Carney DE, Kilpatrick J, Gatto LA, Paskanik AM, Nieman GF. Invasive arterial BP monitoring in trauma and critical care: effect of variable transducer level, catheter access, and patient position. Chest 2001; 120:1322-6. [PMID: 11591577 DOI: 10.1378/chest.120.4.1322] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
OBJECTIVES (1) To determine the validity of current recommendations for direct arterial BP measurement that suggest that the transducer (zeroed to atmosphere) be placed level with the catheter access regardless of subject positioning: and (2) to investigate the effect of transducer level, catheter access site, and subject positioning on direct arterial BP measurement. DESIGN Prospective, controlled laboratory study. SETTING Large animal laboratory. SUBJECTS Five Yorkshire pigs. INTERVENTIONS Anesthetized animals had 16F catheters placed at three access sites: aortic root, femoral artery, and distal hind limb. Animals were placed in supine, reverse Trendelenburg 35 degrees, and Trendelenburg 25 degrees positions with a transducer placed level to each access site while in every position. MEASUREMENTS AND MAIN RESULTS For each transducer level, five systolic and diastolic pressures were measured and used to calculate five corresponding mean arterial pressures (MAPs) at each access site. When transducers were at the aortic root, MAP corresponding to aortic root pressure was obtained in all positions regardless of catheter access site. When transducers were moved to the level of catheter access, as current recommendations suggest, significant errors in aortic MAP occurred in the reverse Trendelenburg position. The same trend for error was noted in the Trendelenburg position but did not reach statistical significance. CONCLUSIONS (1) Current recommendations that suggest placing the transducer at the level of catheter access regardless of patient position are invalid. Significant errors occur when subjects are in nonsupine positions. (2) Valid determination of direct arterial BP is dependent only on transducer placement at the level of the aortic root, and independent of catheter access site and patient position.
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Affiliation(s)
- U G McCann
- Cardiopulmonary and Critical Care Laboratory, SUNY Upstate Medical University, University Hospital, Syracuse, NY, USA
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Kilpatrick J. Policy reflects change from diploma to degree preparation. Nurs N Z 2001; 7:20. [PMID: 12008228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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Li Y, Cockburn W, Kilpatrick J, Whitelam GC. Cytoplasmic expression of a soluble synthetic mammalian metallothionein-alpha domain in Escherichia coli. Enhanced tolerance and accumulation of cadmium. Mol Biotechnol 2000; 16:211-9. [PMID: 11252806 DOI: 10.1385/mb:16:3:211] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Bacteria are commonly used for bioremediation of heavy metal pollution and strategies to improve their performance in this respect are desirable. In this study, an Escherichia coli strain was engineered to express a common metallothionein-alpha domain. The metallothionein-alpha domain was over-expressed in the cytoplasm of E. coli as a fusion to the carboxyl terminal of maltose binding protein. The fusion protein was highly soluble in the cytoplasm of E. coli. When grown in the presence of cadmium, cells expressing the metallothionein-alpha fusion protein showed increased viability compared with control cells. Cells expressing the metallothionein-alpha also demonstrated increased accumulation of cadmium.
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Affiliation(s)
- Y Li
- Department of Biology, University of Leicester, University Road, Leicester, LE1 7RH, UK.
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Abstract
Monoclonal sheep antibodies have great potential for biomedical, veterinary and agricultural purpose. Although conventional sheep monoclonal antibodies can be generated by a modified hybridoma technology, the procedures are not routine. Here, we describe a method to generate recombinant sheep antibody fragments from immunised animals using a modified phage display system. Total RNA from pooled spleens of sheep immunised with the model antigens human serum albumin and conalbumin were used to amplify immunoglobulin V gene repertoires and an efficient two-step cloning method was employed to rapidly construct a phage display single-chain Fv (scFv) library. A total of 14 different scFvs were isolated and characterised. Sequence analysis indicated typical ovine immunoglobulin characteristics. Thirteen Vlambda and 11 VH genes were identified that could be grouped into the sheep Vlambda families I, II, VI and a single VH family. Soluble monomeric scFvs, produced in the periplasm of Escherichia coli, were subjected to affinity measurement via surface plasmon resonance analysis and affinities typical of the secondary immune response were observed. The method described here should be of value for the study of sheep immunology as well as for biorecognition in general.
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Affiliation(s)
- Y Li
- Department of Biology, University of Leicester, University Road, Leicester, UK.
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Kilpatrick J. Comprehensive rehabilitation of a brain-injured child: An illustration of the multiple systems approach. Arch Clin Neuropsychol 1995. [DOI: 10.1016/0887-6177(95)92964-7] [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: 11/16/2022] Open
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Scandella CJ, Kilpatrick J, Lidster W, Parker C, Moore JP, Moore GK, Mann KA, Brown P, Coates S, Chapman B. Nonaffinity purification of recombinant gp120 for use in AIDS vaccine development. AIDS Res Hum Retroviruses 1993; 9:1233-44. [PMID: 8142140 DOI: 10.1089/aid.1993.9.1233] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
The gene encoding the major envelope glycoprotein of the HIV-SF2 isolate was engineered for the secretion of recombinant gp120 (rgp120SF2) from permanent Chinese hamster ovary (CHO) cell lines. Cellular production methods were scaled up and a method for purification of the secreted glycoprotein was devised. Mild purification conditions were selected in order to preserve the native structure of the protein. rgp120SF2 exhibits a molecular weight of 120 kDa in reduced or nonreduced SDS gels; thus the polypeptide chain is intact. Deglycosylated rgp120SF2 has the predicted molecular weight of the polypeptide backbone, 54 kDa. Gel-filtration HPLC in a nondenaturing buffer at neutral pH yields a molecular weight estimate of approximately 120 kDa. Purified rgp120 closely resembles authentic viral gp120 by several physical, chemical, and immunochemical tests. rgp120SF2 reacts strongly with human HIV-positive sera, monoclonal antibodies reactive with HIV-SF2 and HIV-MN viral envelope, and a human virus-neutralizing monoclonal antibody that maps to a conserved discontinuous epitope on HIV-1 gp120. Purified rgp120SF2 forms a 1:1 molecular complex with soluble recombinant human CD4 (rCD4) receptor, as demonstrated by gel-filtration HPLC; binding is high affinity (Kd approximately 2 x 10(-9) M).
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Affiliation(s)
- C J Scandella
- Department of Process Development, Chiron Corporation, Emeryville, California 94608
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Abstract
In certain thrombotic states, large declines in the levels of functional circulating antithrombin occur, which may reflect the highly active nature of the endothelial surface in suppressing excessive amounts of activated coagulation enzymes. Alternatively, we have recently observed an unexpected and paradoxical in vitro functioning of heparin that could result in the inactivation of antithrombin in pathologic conditions. Specifically, antithrombin was rendered nonfunctional as an inhibitor of clotting enzymes as a result of a limited, heparin-dependent cleavage by neutrophil elastase. This inactivation occurred only in the presence of the active anticoagulant heparin fraction, which suggested that the heparin-antithrombin complex was the substrate for elastase attack. Interestingly, neutrophil elastase was found to bind tightly to heparin and heparin-like materials. Neutrophil elastase has been previously linked to nonspecific proteinolysis occurring in inflammatory thrombotic reactions. This affinity of both antithrombin and elastase for heparin suggests a novel mechanism of potential specificity. An important component of this hypothesis is the localization of the elastase/antithrombin reaction away from the high circulating levels of elastase inhibitors. The proposed inactivation of antithrombin on the vascular surface would likely occur only in pathologic states associated with neutrophil sequestration and activation. Nevertheless, this mechanism could lead to a localized reversal of the nonthrombogenic nature of the endothelium and potentially lead to significant reductions of functional antithrombin in certain disease states.
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Affiliation(s)
- R E Jordan
- Department of Physiology, Cutter Biological, Miles Inc., Berkeley, California
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Jordan RE, Nelson RM, Kilpatrick J, Newgren JO, Esmon PC, Fournel MA. Inactivation of human antithrombin by neutrophil elastase. Kinetics of the heparin-dependent reaction. J Biol Chem 1989; 264:10493-500. [PMID: 2732232] [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: 01/02/2023] Open
Abstract
Human neutrophil elastase catalyzes the inactivation of antithrombin by a specific and limited proteinolytic cleavage. This inactivation reaction is greatly accelerated by an active anticoagulant heparin subfraction with high binding affinity for antithrombin. A potentially complex reaction mechanism is suggested by the binding of both neutrophil elastase and antithrombin to heparin. The in vitro kinetic behavior of this system was examined under two different conditions: 1) at a constant antithrombin concentration in which the active anticoagulant heparin was varied from catalytic to saturating levels; and 2) at a fixed, saturating heparin concentration and variable antithrombin levels. Under conditions of excess heparin, the inactivation could be continuously monitored by a decrease in the ultraviolet fluorescence emission of the inhibitor. A Km of approximately 1 microM for the heparin-antithrombin complex and a turnover number of approximately 200/min was estimated from these analyses. Maximum acceleratory effects of heparin on the inactivation of antithrombin occur at heparin concentrations significantly lower than those required to saturate antithrombin. The divergence in acceleratory effect and antithrombin binding contrasts with the anticoagulant functioning of heparin in promoting the formation of covalent antithrombin-enzyme complexes and is likely to derive from the fact that neutrophil elastase is not consumed in the inactivation reaction. A size dependence was observed for the heparin effect since an anticoagulantly active octasaccharide fragment of heparin, with avid antithrombin binding activity, was without effect on the inactivation of antithrombin by neutrophil elastase. Despite the completely nonfunctional nature of elastase-cleaved antithrombin and the altered physical properties of the inhibitor as indicated by fluorescence and sodium dodecyl sulfate-polyacrylamide gel electrophoresis, the inactivated inhibitor exhibited a circulating half-life in rabbits that was indistinguishable from native antithrombin. These results point to an unexpected and apparently contradictory function for heparin which may relate to the properties of the vascular endothelium in pathological situations.
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Affiliation(s)
- R E Jordan
- Department of Physiology, Cutter Biological Group, Miles Laboratories, Berkeley, California 94710
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Abstract
Heparin is an acceleratory cofactor for antithrombin, a circulating inhibitor of blood coagulation enzymes. The presence of heparin on blood vessel walls is believed to contribute to the nonthrombogenic properties of those surfaces. In apparent opposition to this function, heparin was found to greatly accelerate the in vitro inactivation of antithrombin by neutrophil elastase. Inactivation rates in solution were potentiated several hundredfold by specific heparin fractions with anticoagulant activity. Although the data suggest that a heparin-antithrombin complex is essential for the inactivation by elastase to occur, the enzyme itself interacts tightly with heparin. These results suggest a mechanism which, if operating in vivo, could lead to a localized neutralization of the anticoagulant function of heparin at the endothelial surface.
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Goddard PJ, Allen WE, Kilpatrick J. Effect of testosterone immunisation on ovarian activity in pony mares during late winter and spring. Vet Rec 1985; 116:374-5. [PMID: 3992857 DOI: 10.1136/vr.116.14.374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Smith NA, Kilpatrick J, Bain RA. Staining large epoxy resin embedded histologic sections by a simplified hematoxylin and eosin method using heat. Stain Technol 1985; 60:59-61. [PMID: 2579483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Kilpatrick J, Sissons J. Haemophilia; a case study. SA Nurs J 1968; 35:10-23. [PMID: 5186900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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