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Altered membrane fluidity and signal transduction in the platelets from patients of thrombotic stroke

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Abstract

Several earlier studies have implicated platelet activation with the pathogenesis of thrombotic stroke. In this report we have studied the changes in membrane physical microenvironment and signal transduction in the platelets obtained from the patients with thrombotic stroke. Aggregation induced by the synthetic agonist thrombin receptor-activating peptide was significantly enhanced (p < 0.001) in the platelets obtained from the patients. Steady-state fluorescence anisotropy measurements using diphenylhexatriene reflected a significant increase in membrane microviscosity from 3.315 (± 0.103) in the control to 4.600 (± 0.119) in the stroke. Proteins of relative mobilities of 131, 100, 47 and 38 kDa were found to remain phosphorylated on tyrosine in the resting platelets obtained from thrombotic stroke patients while they were not phosphorylated in the control counterparts. Besides, calpain, a calcium dependent thiol protease present in the platelets, was found to remain active in this disease as reflected from the proteolysis of calpain substrates. Taken together, these data indicated abnormal circulating platelets in the patients of thrombotic stroke, which could contribute to the etiopathogenesis of this disease.

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  1. Department of Biochemistry, Institute of Medical Sciences, Banaras Hindu University, Varanasi, 221005, India

    Kalyan Srivastava & Debabrata Dash

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  1. Kalyan Srivastava
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  2. Debabrata Dash
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Correspondence to Debabrata Dash.

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Srivastava, K., Dash, D. Altered membrane fluidity and signal transduction in the platelets from patients of thrombotic stroke. Mol Cell Biochem 224, 143–149 (2001). https://doi.org/10.1023/A:1011979801366

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