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  • Title: [Expression of costimulatory molecules on peripheral blood lymphocytes of patients with idiopathic thrombocytopenic purpura].
    Author: Zhao YX, Gao QP, Cheng YH, Ao XB, Chen LH, Yang NL, Wang QY, Shen LY.
    Journal: Zhonghua Xue Ye Xue Za Zhi; 2003 Sep; 24(9):474-6. PubMed ID: 14575591.
    Abstract:
    OBJECTIVE: To investigate the expressions of costimulators on peripheral T and B lymphocytes in patients with idiopathic thrombocytopenic purpura (ITP). METHODS: The expression of B7-CD(28) and CD(40) of peripheral lymphocytes was measured by flow cytometry in 21 ITP patients and 9 normal subjects. The expression of PAIgG was measured by ELISA method. RESULTS: The expression of CD(4)(+)CD(28)(+) was lower in ITP patients than in normal controls, but the expression of CD(86)(+) and CD(86)(+)CD(19)(+) was higher in ITP patients than in normal controls, while the expression of CD(80)(+), CD(40)(+), CD(28)(+), CD(19)(+)CD(86)(+), CD(19)(+)CD(40)(+), CD(4)(+)CD(28)(+)/CD(4)(+), CD(19)(+)CD(80)(+)/CD(19)(+) and CD(19)(+)CD(40)(+)/CD(19)(+) in ITP patients was normal. The PAIgG level was higher in 16 patients with a mean of (184.62 +/- 38.00) ng/10(7) plt. A positive correlation was found between PAIgG and CD(19)(+)CD(86)(+)/CD(19)(+) expression. CONCLUSION: There is no deficiency in expression of CD(28) on CD(4)(+) T lymphocytes in ITP patients. The change of CD(86) expression on B lymphocytes is possibly involved in pathophysiology of ITP, which may provide a theoretical instruction for ITP patients immunological therapy.
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