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排序方式: 共有528条查询结果,搜索用时 15 毫秒
521.
Proteolytic degradation of von Willebrand factor after DDAVP administration in normal individuals 总被引:1,自引:0,他引:1
Batlle J; Lopez-Fernandez MF; Lopez-Borrasca A; Lopez-Berges C; Dent JA; Berkowitz SD; Ruggeri ZM; Zimmerman TS 《Blood》1987,70(1):173-176
The infusion of 1-deamino-8-D-arginine vasopressin (DDAVP) in normal individuals is followed by an increase in factor VIII/von Willebrand factor (vWF) in plasma, by an increase in intensity of all sizes of multimers, and by the appearance of larger multimers of vWF than those seen in the resting state. Since the larger multimers are rapidly cleared and proteolysis is known to cause disaggregation of large multimers, we evaluated the degree of vWF proteolysis after DDAVP administration. DDAVP was infused into eight normal adult volunteers, and the relative proportions of the intact 225 kilodalton (kDa) subunit and the 189, 176, and 140 kDa vWF fragments were compared before and at different times after DDAVP infusion. The relative proportion of the 176 kDa fragment was increased, whereas that of the other species was decreased, thereby indicating that proteolytic fragmentation had occurred. However, plasmin did not appear to be responsible because the vWF fragments characteristically produced by this enzyme could not be detected. Concomitant analysis of vWF multimeric structure showed that these changes were accompanied by an increase in the relative proportion of the satellite bands, which suggests that they were proteolytically generated. Proteolysis may explain, at least in part, rapid clearance of larger vWF multimers released by DDAVP. 相似文献
522.
523.
Briggs RC; Briggs JA; Ozer J; Sealy L; Dworkin LL; Kingsmore SF; Seldin MF; Kaur GP; Athwal RS; Dessypris EN 《Blood》1994,83(8):2153-2162
We have previously shown that the human myeloid cell nuclear differentiation antigen (MNDA) is expressed at both the antigen and mRNA levels specifically in human monocytes and granulocytes and earlier stage cells in the myeloid lineage. A 200 amino acid region of the MNDA is strikingly similar to a region in the proteins encoded by a family of interferon-inducible mouse genes, designated Ifi-201, Ifi- 202, Ifi-203, etc, that are not regulated in a cell- or tissue-specific fashion. However, a new member of the Ifi-200 gene family, D3, is induced in mouse mononuclear phagocytes but not in fibroblasts by interferon. The same 200 amino acid region, duplicated in the mouse Ifi- 200 gene family, is also repeated in the recently characterized human IFI 16 gene that is constitutively expressed specifically in lymphoid cells and is induced in myeloid cells by interferon gamma. The 1.8-kb MNDA mRNA, which contains an interferon-stimulated response element in the 5' untranslated region, was significantly upregulated in human monocytes exposed to interferon alpha. Characterization of the MNDA gene showed that it is a single-copy gene and localized to human chromosome 1q 21-22 within the large linkage group conserved between mouse and human that contains the Ifi-200 gene family. The IFI 16 gene is also located on human chromosome 1q. Our observations are consistent with the proposal that the MNDA is a member of a cluster of related human interferon-regulated genes, similar to the mouse Ifi-200 gene family. In addition, one mouse gene in the Ifi-200 gene family and the human MNDA and IFI 16 genes show expression and/or regulation restricted to cells of the hematopoietic system, suggesting that these genes participate in blood cell-specific responses to interferons. 相似文献
524.
Kitchen L; Leal M; Wichmann I; Lissen E; Ollero M; Allan JS; McLane MF; Essex M 《Blood》1985,66(6):1473-1475
We tested serum samples from 50 hemophiliacs from Sevilla, Spain, for antibody to HTLV-III by indirect membrane immunofluorescence (IMI) and radioimmunoprecipitation with SDS polyacrylamide gel electrophoresis (RIP-SDS/PAGE). All had received commercial clotting factors from the United States with the exception of one hemophiliac who had never been transfused. Thirty-four (68%) reacted with HTLV-III-infected cells (H9/HTLV-III) by both methods, but not with the uninfected line (H9). Of 41 hemophilia-A patients tested, 28 (68%) were positive, and of nine hemophilia-B patients, six (66%) were positive. The nontransfused hemophilia-B patient was negative for antibody to HTLV-III by both methods. One patient with clinical AIDS tested positive as did six of seven with chronic unexplained lymphadenopathy. The eight individuals with AIDS or lymphadenopathy all had hemophilia A. We conclude that exposure to HTLV-III is widespread among asymptomatic hemophiliacs in Spain. 相似文献
525.
Rearrangement and overexpression of the BCL-1/PRAD-1 gene in intermediate lymphocytic lymphomas and in t(11q13)-bearing leukemias 总被引:7,自引:0,他引:7
Rimokh R; Berger F; Delsol G; Charrin C; Bertheas MF; Ffrench M; Garoscio M; Felman P; Coiffier B; Bryon PA 《Blood》1993,81(11):3063-3067
The t(11;14)(q13;q32) translocation and its molecular counterpart, BCL- 1 rearrangement, are consistent features of intermediate lymphocytic lymphoma (ILL). Rearrangement is thought to deregulate the nearby PRAD- 1/BCL-1 proto-oncogene that is a newly identified member of the cyclin family. To characterize further the association between rearrangement of chromosome 11q13 and over-expression of BCL-1. Southern blot analysis was performed in 33 cases of ILL, 5 cases of t(11;14)- associated leukemias, and 1 case of leukemia carrying a variant translocation t(11;19)(q13;q13) using three separate BCL-1 locus probes. When RNA was available, BCL-1 expression was assessed by Northern blot analysis. DNA from 19 of 33 ILL (57%) showed BCL-1 rearrangement, 16 involving the major translocation cluster (MTC) region and 3 involving a new breakpoint cluster located in the 5' flanking region of the BCL-1 gene. DNA from 3 of 6 t(11q13)-associated leukemias demonstrated a rearrangement involving the MTC. Northern blot analysis showed that BCL-1 was overexpressed in 14 of 15 ILL and in all leukemias analyzed (included the t(11;19) leukemia) relative to normal and malignant lymphoid tissues. These results constitute additional elements in favor of the role of BCL-1 in lymphoid neoplasia and allow us to speculate about its mechanisms of activation. 相似文献
526.
Hepatitis C virus infection in the elderly 总被引:1,自引:0,他引:1
Brind AM; Watson JP; James OF; Bassendine MF 《QJM : monthly journal of the Association of Physicians》1996,89(4):291-296
We studied hepatitis C virus (HCV)-related disease in older people because
the treatment rationale for younger asymptomatic patients is based on the
long-term prognosis of infection. Of the HCV-antibody-positive patients
seen at Freeman Hospital 1990-1994, 25 were >65 years old; 24 were
Caucasian and one was Afro-Caribbean. Median age at presentation was 67
years, and five were female. Nine were asymptomatic at presentation, six
presented with varices, five with malaise, three with abdominal pain one
with pruritis and one with oedema. Risk factors identified were:
transfusion (7), haemodialysis (1), health care worker (dentist) (1), and
tattoos (2). There was no recognized risk factor for infection in 14, but
five of these had done military service in areas of high HCV prevalance.
Liver biopsy in 20 showed chronic hepatitis in two, cirrhosis in 12, and
cirrhosis and hepatocellular carcinoma in six. Three additional patients
also developed hepatocellular carcinoma. HCV genotyping was done in 19 and
all were type 1 (1a, 4; 1b, 14; 1 untypable, 1). Eleven died, at median age
71 years (range 65-94 years), five of HCV liver-related deaths and two from
HCV-associated non hepatic disorders (non-Hodgkin's lymphoma and fibrosing
alveolitis).
相似文献
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