Thromb Haemost 1990; 63(01): 103-111
DOI: 10.1055/s-0038-1645695
Original Article
Schattauer GmbH Stuttgart

Analysis of Platelet Cytoskeleton Assembly during Platelet Activation in Hermansky-Pudlak Syndrome and Thrombasthenia

Kingo Fujimura
The Department of Internal Medicine, Research Institute for Nuclear Medicine and Biology, Hiroshima University, Japan
,
Tetsuro Fujimoto
The Department of Internal Medicine, Research Institute for Nuclear Medicine and Biology, Hiroshima University, Japan
,
Motoyoshi Takemoto
The Department of Internal Medicine, Research Institute for Nuclear Medicine and Biology, Hiroshima University, Japan
,
Kenji Oda
The Department of Internal Medicine, Research Institute for Nuclear Medicine and Biology, Hiroshima University, Japan
,
Takeshi Shimomura
The Department of Internal Medicine, Research Institute for Nuclear Medicine and Biology, Hiroshima University, Japan
,
Shuji Maehama
The Department of Internal Medicine, Research Institute for Nuclear Medicine and Biology, Hiroshima University, Japan
,
Atusushi kuramoto
The Department of Internal Medicine, Research Institute for Nuclear Medicine and Biology, Hiroshima University, Japan
› Author Affiliations
Further Information

Publication History

Received 29 July 1989

Accepted after revision19 October 1989

Publication Date:
02 July 2018 (online)

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Summary

Time course change of the platelet cytoskeletal protein component in the Triton X-100 insoluble fraction after stimulation was analyzed in Hermansky-Pudlak syndrome and thrombasthenia.

In Hermansky-Pudlak syndrome (HPS), a 31 kDa protein, myosin, actin, and a 100 kDa protein assembled as in the normal platelets at the shape change and release reaction phases after ADP or collagen stimulation, suggesting that, the deficient dense granule content do not lead to an abnormal platelet cytoskeletal protein assembly. In thrombasthenia (Type I), myosin increased at the shape change and release reaction phases as it does in normal platelets, but actin and the 100 kDa protein increased only at the initial activation phase, and then subsequently decreased to the level of the resting phase. The actin-binding protein (ABP) and the 31 kDa protein increased a little following stimulation. Similar cytoskeletal protein change after stimulation were found in normal platelets which were prevented from the aggregation process by chelating the external Ca2+ or by using synthetic decapeptide of fibrinogen γ-chain of carboxyl terminus. The decreased platelet cytoskeletal protein assembly in thrombasthenia or in platelets stimulated without aggregation, was derived from a loss of the platelet aggregation process due to the defect of GP Ilb-IIIa complex or an interaction failure between GP IIb-IIIa complex and fibrinogen. The interaction between platelets and either fibrinogen or fibrin can induce a more stable platelet cytoskeletal protein assembly, however, agonistic stimulation without these interactions cannot do it directly.