Abstract:
:Low concentrations of collagen and anticardiolipin antibodies (ACLA), which were raised in rabbits by immunization with cardiolipin (CL), co-operatively activated human gel-filtrated platelets (GFP). GFP activated by adding ACLA 5 min prior to collagen (ACLA + Col) showed strong responses in cytosolic Ca2+ mobilization and cell aggregation; the responses decreased after 1 min, however, when collagen was added prior to ACLA (Col + ACLA). Col + ACLA was 30% less effective than the ACLA + Col in: (1) the phosphorylation of pleckstrin and myosin light chain; and (2) the secretion of alpha- and dense granules. Indomethacin inhibited Ca2+ mobilization, pleckstrin phosphorylation and cell aggregation in platelets stimulated by ACLA + Col. The thromboxane B2 level in platelets induced by ACLA + Col was similar to that stimulated by low concentrations of collagen alone. ACLA + Col increased the activities of phospholipase C (PLC) as determined by formation of phosphatidic acid (PA), whereas indomethacin and adenosine 2',5'-diphosphate, an antagonist of the ADP P2Y1 receptor, inhibited PA formation. These results suggest that ACLA, thromboxane A2 derived from the collagen pathway and secreted ADP co-operatively augment PLC activity and lead to platelet aggregation.
journal_name
Br J Haematoljournal_title
British journal of haematologyauthors
Wang L,Su CY,Chou KY,Wang CTdoi
10.1046/j.1365-2141.2002.03739.xsubject
Has Abstractpub_date
2002-09-01 00:00:00pages
1152-62issue
4eissn
0007-1048issn
1365-2141pii
3739journal_volume
118pub_type
杂志文章abstract::This trial explored the efficacy of re-induction chemotherapy including bortezomib in paediatric relapsed/refractory acute lymphoblastic leukaemia. Patients were randomized 1:1 to bortezomib (1.3 mg/m2 /dose) administered early or late to a dexamethasone and vincristine backbone. Both groups did not differ regarding p...
journal_title:British journal of haematology
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