1226
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Abstract
The conformation of the histone octamer complex in solution has been shown, by circular dichroism studies, to be highly dependent on the nature of the salt milieu and its concentration. In 2 M NaCl, the complex has 43.5% alpha-helix, 16% beta-sheet, and 40.5% random structure. In 2.3 M (NH4)2SO4, the octamer has 49.0% alpha-helix and 51% random structure. These results partially explain the discrepant results obtained by the X-ray analysis of crystals obtained under varying conditions.
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1227
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Hiyoshi M, Yokomatsu Y, Kishida T, Sasaki A, Sannomiya Y, Yoshikawa T, Nin T, Tatsumi N, Okuda K, Park K. [Spurious platelet count associated with acute leukemia, a report of two cases]. RINSHO BYORI. THE JAPANESE JOURNAL OF CLINICAL PATHOLOGY 1987; 35:1175-80. [PMID: 3437550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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1228
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Jeong K, Park K. Observation of a very-low-frequency oscillation in a Taylor-Couette flow. PHYSICAL REVIEW. A, GENERAL PHYSICS 1987; 35:4854-4855. [PMID: 9898098 DOI: 10.1103/physreva.35.4854] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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1229
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Thomas J, Carver M, Cunningham P, Park K, Gonder J, Thomas F. Promotion of incompatible allograft acceptance in rhesus monkeys given posttransplant antithymocyte globulin and donor bone marrow. I. In vivo parameters and immunohistologic evidence suggesting microchimerism. Transplantation 1987; 43:332-8. [PMID: 3103273 DOI: 10.1097/00007890-198703000-00002] [Citation(s) in RCA: 78] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
This report extends previous studies demonstrating that prolonged acceptance of incompatible kidney allografts in rhesus monkeys can be achieved by a short recipient rabbit antithymocyte globulin (RATG) treatment course followed by donor bone marrow infusion on day 12 without a requirement for chronic immunosuppression. Serial studies of antilymphocyte cyctotoxic antibody in recipients' sera following RATG injections showed pan-lymphocyte-reactive antibody present until day 10 posttransplant. On days 11 and 12, pan-lymphocyte-reactive antibody was no longer detectable, but cytotoxic antibody specific for mature T cells remained in recipients' sera. These findings might explain the critical time relationship between antithymocyte globulin treatment and donor bone marrow infusion, and further suggest that the tolerance-promoting cell in donor bone marrow is not a mature T cell, but rather a pre-T or a non-T cell. Finally, it was found that this treatment protocol resulted in development of lymphoid nodules in the transplanted kidney that express a CD8-positive, FcIgG-receptor-positive phenotype and appear to be of donor origin. The possibility of a veto cell type of mechanism is discussed as an explanation for the promotion of allograft acceptance in this model.
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1230
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Park K, Simmons SR, Albrecht RM. Surface characterization of biomaterials by immunogold staining--quantitative analysis. SCANNING MICROSCOPY 1987; 1:339-50. [PMID: 3589609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The labeling of target proteins by immunogold particles has been analyzed based on Einstein's law of Brownian motion. The theory was confirmed from the experiments which employed antifibrinogen gold markers to label fibrinogen molecules adsorbed on the polyethylene surface. The theory predicts that the degree of labeling depends on the concentration of gold markers, temperature, medium viscosity, size of gold markers, and staining time. Of these factors most important is the concentration of immunogold particles. Small change in the marker concentration results in a significant variation in the staining efficiency when other variables are kept constant. The effect of temperature is always accompanied with that of the medium viscosity. There is a linear relationship between the degree of labeling and the temperature when the viscosity effect is combined. The staining of fibrinogen molecules adsorbed on the polyethylene surface at three different temperatures shows a temperature dependence which is in close agreement with the theory. The degree of labeling is inversely related to a square root of the size of gold markers. This analysis makes it possible to maximize the staining sensitivity and to improve the reproducibility of the labeling. Thus, the immunogold staining under a well defined condition allows quantification as well as positive identification and localization of target proteins. This technique has been used to study protein adsorption on biomaterials.
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1231
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Carver M, Thomas J, Gonder J, Cunningham P, Park K, Thomas F. Unresponsiveness to kidney transplants in primates: immunohistologic studies of long-surviving grafts. Transplant Proc 1987; 19:501-3. [PMID: 3079161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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1232
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1233
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Epstein W, Park K. Continuous optical transformations do not elicit unique perceptual descriptions. PERCEPTION & PSYCHOPHYSICS 1986; 40:365-9. [PMID: 3808902 DOI: 10.3758/bf03208195] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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1234
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Blessing K, Park K, McLaren K, Eremin O. Gastro-intestinal involvement with metastatic melanoma: clinical and pathological features. JOURNAL OF THE ROYAL COLLEGE OF SURGEONS OF EDINBURGH 1986; 31:293-5. [PMID: 3795149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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1235
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Park K, Gerndt SJ, Cooper SL. The effect of fibrinogen sialic acid residues on ex vivo platelet deposition on biomaterials. Thromb Res 1986; 43:293-302. [PMID: 3738866 DOI: 10.1016/0049-3848(86)90149-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The effect of fibrinogen sialic acid residues on platelet deposition onto polymer surfaces was examined using a canine ex vivo shunt model. To test the hypothesis that desialylated fibrinogen may enhance platelet deposition when precoated on biomaterials, canine fibrinogen was desialylated and precoated on polyvinyl chloride (PVC) shunts. When protein-coated PVC shunts were exposed to flowing whole blood, both the native and the desialylated fibrinogen elicited the same profile of platelet deposition. This study indicates that platelet deposition and thrombus formation on biomaterial surfaces is not mediated by a mechanism which involves the sialic acid residues of fibrinogen.
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1236
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Huh KB, Lee HC, Kim HM, Lee HR, Hong CS, Lee SY, Choi HJ, Park K, Kim CK. Human leukocyte antigen (HLA) in Korean patients with autoimmune thyroid diseases. Korean J Intern Med 1986; 1:243-8. [PMID: 3154621 PMCID: PMC4536718 DOI: 10.3904/kjim.1986.1.2.243] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
In previous studies, there has been evidence of different allelic associations with a particular disease among various ethnic groups. The present study was done to investigate the associations between HLA and autoimmune thyroid diseases in the Korean. We found no association between Graves’ disease and HLA-B8 or -B35. However, increased frequencies of HLA-A11 and -DRw8, and the decreased frequencies of HLA-A10 and B12 were found in patients with Graves’ disease. In the cases of Hashimoto’s disease, the frequencies of HLA-A2 and -DRw8 were found to be significantly increased and the frequency of HLA-DRw6y decreased. These data indicate that the association between autoimmune thyroid disease and HLA in the Korean would appear to be different from that in most other racial groups, including Caucasians, Japanese and Chinese.
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1237
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Sasaki A, Hiyoshi M, Yokomatsu Y, Park K, Yoshikawa C, Im T, Tatsumi N, Kamitani T. [Malignant histiocytosis associated with hypogammaglobulinemia]. [RINSHO KETSUEKI] THE JAPANESE JOURNAL OF CLINICAL HEMATOLOGY 1986; 27:920-4. [PMID: 3761577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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1238
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Park K, Mosher DF, Cooper SL. Acute surface-induced thrombosis in the canine ex vivo model: importance of protein composition of the initial monolayer and platelet activation. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1986; 20:589-612. [PMID: 3711136 DOI: 10.1002/jbm.820200506] [Citation(s) in RCA: 89] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The initial events occurring at the blood-polymer interface were examined using a canine ex vivo arteriovenous shunt model. Thrombogenic (fibrinogen) and nonthrombogenic (albumin) proteins were preadsorbed on poly(vinyl chloride), polyethylene, and silicone rubber shunt surfaces, and the blood responses were analyzed using the platelet deposition profile as an indicator of surface thrombogenicity. The distributions of preadsorbed protein molecules on the various polymer surfaces were studied using an immunogold bead (colloidal gold particles coated with antibodies) staining technique and shown to be homogeneous. A sequential protein adsorption technique was developed to probe the nature of competitive protein adsorption and to observe the effect of surface protein concentration on thrombogenicity. The thrombogenicity of a surface was determined by the composition of the initial protein layer rather than the total concentration of protein on the polymer surfaces. The composition of this layer determines the extent of platelet activation and the adhesive strength between platelets and the polymer surface.
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1239
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Kim HM, Huh KB, Lee HC, Lim SK, Park K, Youn JK, Lee SY. Immunological study on autoimmune postpartum thyroiditis. Yonsei Med J 1986; 27:276-82. [PMID: 3494344 DOI: 10.3349/ymj.1986.27.4.276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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1240
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Shirey RS, Park K, Ness PM, Kickler TS, Rones J, Dawson RB, Jiji R. An anti-i biphasic hemolysin in chronic paroxysmal cold hemoglobinuria. Transfusion 1986; 26:62-4. [PMID: 3946006 DOI: 10.1046/j.1537-2995.1986.26186124034.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Paroxysmal cold hemoglobinuria (PCH) was diagnosed in an elderly patient with a history of chronic lymphocytic leukemia. In this case, the Donath-Landsteiner antibody demonstrated anti-i specificity rather than the more commonly reported anti-P specificity. This unusual case of a biphasic hemolysin with anti-i specificity emphasizes the importance of performing a Donath-Landsteiner test when presented with serological or clinical findings that are suggestive of PCH.
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1241
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Huh KB, Lee HC, Park K, Lee SY. HLA distribution in Korean patients with insulin-dependent diabetes mellitus. Yonsei Med J 1986; 27:54-8. [PMID: 3604273 DOI: 10.3349/ymj.1986.27.1.54] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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1242
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Lambrecht LK, Young BR, Stafford RE, Park K, Albrecht RM, Mosher DF, Cooper SL. The influence of preadsorbed canine von Willebrand factor, fibronectin and fibrinogen on ex vivo artificial surface-induced thrombosis. Thromb Res 1986; 41:99-117. [PMID: 3485833 DOI: 10.1016/0049-3848(86)90283-5] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
We have examined the effects of preadsorption of several canine plasma proteins on surface-induced thrombogenesis in a canine ex vivo model. Our technique allowed determination of initial deposition and subsequent embolization of 51Cr-labeled platelets and 125I-fibrinogen onto and from polymeric arterio-venous shunts in non-anticoagulated canines. Segments of the tubing were removed at various time points between 2 and 120 minutes of blood contact for examination of the morphology of the thrombus by scanning electron microscopy. Thrombus deposition was measured on uncoated plasticized poly(vinyl chloride) (PVC) and PVC precoated with canine von Willebrand factor (vWF), fibronectin, partially purified fibrinogen (fibrinogen which contained vWF and fibronectin as impurities), or purified fibrinogen (fibrinogen which had been further purified to remove fibronectin and vWF). Preadsorption of all proteins studied enhanced the thrombogenic response relative to that of the uncoated surface. Precoating with vWF or partially purified fibrinogen resulted in the deposition of the greatest number of thrombi, and embolization was slower than on shunts precoated with canine fibronectin or purified fibrinogen. The deposition-embolization profiles for the fibronectin and purified fibrinogen-coated surfaces were similar. The amount and time sequence of initial adhesion and spreading of platelets was related to the extent and time sequence of peak thrombus formation. The partially purified fibrinogen-coated and vWF-coated surfaces had more adhered and spread platelets at the earliest time points and a greater number of larger thrombi at the peak deposition times. The slowest rate of platelet adhesion and spreading was seen on the purified fibrinogen-coated surface. White blood cells were present very early on surfaces precoated with vWF and partially purified fibrinogen, and were present prior to embolization on all surfaces. Major conclusions from this work indicate that, although fibrinogen and fibronectin promote thrombogenesis when adsorbed to a surface, vWF is even more active in promoting platelet deposition and in anchoring thrombi to the surface of biomaterials. Thus, differences in vWF adsorption to biomaterials may be a determinant of surface-induced thrombogenesis.
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1243
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Saaki A, Yokomatsu Y, Kojima K, Yoshikawa T, Sannomiya Y, Tatsumi J, Hashimoto K, Park K, Kawarabayashi K, Yoshikawa C. [Combination chemotherapy with cyclophosphamide, adriamycin, vincristine and prednisolone (VEPA) for non-Hodgkin's lymphoma]. Gan To Kagaku Ryoho 1986; 13:65-9. [PMID: 3753642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Combination Chemotherapy with Adriamycin (VEPA) was applied to 16 patients with non-Hodgkin's lymphoma. The effects of VEPA therapy were compared with those of combination chemotherapy without Adriamycin (non-VEPA). Complete remission rate achieved with VEPA therapy was 37.5% while that with non-VEPA therapy was 27.6%. Histologically, the complete remission rate in cases of large-cell type treated with VEPA therapy was 40%, while that with non-VEPA therapy was 14.3%. No cases of stage IV showed complete remission, whereas the complete remission rate for cases of stage III was 37.5% for VEPA therapy, but 27.6% for non-VEPA therapy. From these results we concluded that VEPA therapy is more effective for non-Hodgkin's lymphoma, especially large-cell type, than non-VEPA therapy.
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1244
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Park K, Tatsumi N, Hashimoto K, Okuda K, Yamamoto S. Simplified separation of myosin from rabbit liver. JOURNAL OF APPLIED BIOCHEMISTRY 1985; 7:250-7. [PMID: 2936710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Myosin was extracted from fresh rabbit liver using a solution with an ionic strength of 0.3 with two protease inhibitors and ATP. The myosin fraction was centrifuged at high speed in the presence of ATP and MgCl2. Its precipitate was dissolved in 0.6 M KCl, and the solution was treated with ammonium sulfate (30-60%). The fraction that precipitated was dissolved in 0.6 M KCl and put on a Sephacryl column. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) showed that the myosin obtained was 90% pure. Its molecular weight was 220,000 by gel electrophoresis; by Sephacryl S-300 column chromatography, it was found to be a complex at high ionic strengths. The protein had high ATPase activity, comparable to that of the myosin prepared by D. L. Brandon (1976, Eur. J. Biochem. 65, 139-146). Electron micrographs of our myosin looked like myosins from nonmuscle cells purified by other workers. Slow preparation gave poor yields of myosin with low ATPase activity and extra bands on SDS-PAGE. Rapid handling of fresh materials is essential for obtaining myosin of satisfactory quality. Our simple method saves time and reagents.
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1245
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Kamitani T, Park K, Tatsumi N, Okuda K. Changes in network patterns of contractile filaments during neutrophil maturation. NIHON KETSUEKI GAKKAI ZASSHI : JOURNAL OF JAPAN HAEMATOLOGICAL SOCIETY 1985; 48:946-57. [PMID: 3904294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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1246
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Tatsumi N, Tatsumi Y, Kawarabayashi K, Park K, Maeda H, Matsumoto H. Regulatory factors of erythrocyte expansibility observed in hypotonic stress. NIHON KETSUEKI GAKKAI ZASSHI : JOURNAL OF JAPAN HAEMATOLOGICAL SOCIETY 1984; 47:878-87. [PMID: 6507017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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1247
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Pintauro PN, Johnson DK, Park K, Baizer MM, Nobe K. The paired electrochemical synthesis of sorbitol and gluconic acid in undivided flow cells. I. J APPL ELECTROCHEM 1984. [DOI: 10.1007/bf00618739] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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1248
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Baizer MM, Nonaka T, Park K, Saito Y, Nobe K. Electrochemical conversion of 2,3-butanediol to 2-butanone in undivided flow cells: a paired synthesis. J APPL ELECTROCHEM 1984. [DOI: 10.1007/bf00618738] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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1249
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Kawarabayashi K, Yoshikawa T, Sannomiya Y, Hashimoto K, Araki J, Park K, Tatumi Y, Kamitani T, Im T, Tatumi N. [High dose of methotrexate-leucovorin treatment in advanced non-Hodgkin's lymphoma]. Gan To Kagaku Ryoho 1983; 10:2493-9. [PMID: 6606395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
High doses of methotrexate (MTX) and leucovorin (LCV) as a rescue treatment were applied to five patients with non-Hodgkin's lymphoma, refractory to standard combination chemotherapy. Two of 5 patients showed a complete remission, and 2 patients showed a partial remission. One patient with massive pleural effusion showed an improvement by the treatment without any severe side effect under monitoring and controlling the dose of MTX. However, the remission duration of the treatment was short; therefore, additive therapy was required of later. From these results we assumed that the high dose of MTX and LCV could be effective for malignant lymphoma being resistant to other combination therapies.
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1250
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Hashimoto K, Sannomiya Y, Yoshikawa T, Yoshikawa C, Araki J, Park K, Tatsumi Y, Kamitani T, Im T, Tatsumi N. [Ultrasonography in detecting hematologic diseases]. [RINSHO KETSUEKI] THE JAPANESE JOURNAL OF CLINICAL HEMATOLOGY 1983; 24:1331-41. [PMID: 6672266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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