Abstract:
:Thrombospondin (TSP), a large protein found in platelet alpha-granules (as TSP-1), mediates adhesion of sickle reticulocytes to cultured vascular endothelium. To further explore the physiologic relevance of this observation, we have measured plasma TSP levels and platelet TSP-1 content in subjects with sickle cell disease. Plasma TSP levels were similar for normal controls (mean 491 ng/ml, range 331-723) and steady-state HbSS patients (mean 536, range 333-1107) and were significantly (P = 0.012) but variably elevated for HbSS patients presenting with acute painful crisis (mean 868, range 442-2780). Some of these elevated plasma TSP levels reached those previously observed to support maximal red cell adhesion to endothelium in vitro. Compared to normals, both steady-state and in-crisis HbSS patients had significantly (P < 0.001) depressed platelet TSP-1 content (82.6 +/- 11.9, 47.1 +/- 16.0 and 45.9 +/- 20.7 ng/l0(6) platelets, respectively, mean +/- SD). HbSC disease patients, all examined during steady state, had low-normal plasma levels of TSP and either normal or depressed platelet TSP-1 content. Serial observations on three sickle cell anemia subjects indicated a probable relationship between platelet TSP-1 release, elevated plasma TSP levels, and acute vaso-occlusive episodes. These results suggest a state of ongoing release and depletion of TSP-1 from activated platelets in patients with sickle cell disease.
journal_name
Am J Hematoljournal_title
American journal of hematologyauthors
Browne PV,Mosher DF,Steinberg MH,Hebbel RPdoi
10.1002/(SICI)1096-8652(199604)51:4<296::AID-AJH8>subject
Has Abstractpub_date
1996-04-01 00:00:00pages
296-301issue
4eissn
0361-8609issn
1096-8652pii
10.1002/(SICI)1096-8652(199604)51:4<296::AID-AJH8>journal_volume
51pub_type
杂志文章abstract::Fifty-nine HIV-1 antibody positive and 58 antibody negative hemophiliacs were evaluated over a 2 year study period to gain insight into the natural history and prognosis of HIV-1 disease in members of this risk group. Mean CD4 (Leu 3+) cell counts calculated at 6 month intervals decreased gradually in seropositive pat...
journal_title:American journal of hematology
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journal_title:American journal of hematology
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journal_title:American journal of hematology
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journal_title:American journal of hematology
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journal_title:American journal of hematology
pub_type: 杂志文章
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更新日期:2008-02-01 00:00:00
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journal_title:American journal of hematology
pub_type: 杂志文章
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更新日期:2000-08-01 00:00:00
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journal_title:American journal of hematology
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更新日期:1994-07-01 00:00:00
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journal_title:American journal of hematology
pub_type: 杂志文章,评审
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更新日期:1993-01-01 00:00:00
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更新日期:2013-05-01 00:00:00
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pub_type: 临床试验,杂志文章
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更新日期:2002-08-01 00:00:00
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journal_title:American journal of hematology
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更新日期:1989-10-01 00:00:00
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journal_title:American journal of hematology
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