Abstract
In the present paper we compare prothrombin‐converting activities of platelets non‐activated, or activated by collagen, thrombin or collagen plus thrombin in the absence and presence of added factor Va. In all experiments described, the rate of thrombin formation for platelets activated by the combined action of collagen and thrombin is greater than that of platelets stimulated by collagen or thrombin alone. The presence of added factor Va enhanced the rate of thrombin formation in all cases, but the higher activity observed with platelets stimulated by collagen plus thrombin remains. When platelets are activated by collagen plus thrombin in the presence factor Xa and prothrombin, a lag period of approximately 10 min is observed before the rate of thrombin formation reaches a steady state. Addition of an excess of factor Va in this experiment reduces the lag time to 3 min. This lag period is interpreted as the time required to generate extra binding sites for the prothrombinase complex at the platelet surface. These extra sites explain the difference in thrombin formation rate between these platelets and platelets activated by either collagen or thrombin only.The exposure of phospholipids at the platelet outer surface was studied with phospholipases after various activations of the platelets. It is demonstrated that activation by collagen plus thrombin is accompanied by increased susceptibility of platelet phospholipids towards phospholipase A2. Among these degradable phospho‐ lipids are 25% of the phosphatidylserine and 30% of the phosphatidylethanolamine. On the other hand, little no phosphatidylserine is exposed at the membrane exterior of thrombin‐treated or control platelets. We propose that the exposure of phosphatidylserine at the outer surface of platelets activated with thrombin plus collagen essential for the rate enhancement of thrombin formation observed under these conditions. The possibility of transbilayer movement of phospholipids in the platelet membrane as a result of the activation process will be discussed.
References
55
Referenced
357
10.1016/0304-4157(78)90003-5
10.1016/S0021-9258(19)86616-4
/ J. Biol. Chem. by Nesheim M. E. (1979)10.1016/S0021-9258(19)86294-4
10.1016/S0021-9258(19)69627-4
10.1038/268358a0
10.3181/00379727-111-27809
10.1016/0304-4165(64)90220-X
/ Biochim. Biophys. Acta by Papahadjopoulous D. P. (1964)10.1016/0005-2760(69)90005-8
10.1016/S0021-9258(19)45275-7
/ J. Biol. Chem. by Bull R. K. (1972)10.1073/pnas.70.5.1344
10.1016/0304-4157(73)90003-8
10.1016/0005-2736(73)90143-0
/ Biochim. Biophys. Acta by Verkley A. J. (1973)10.1016/0005-2736(74)90084-4
10.1002/cjce.5450520617
10.1016/0005-2736(75)90044-9
10.1016/0005-2736(77)90192-4
10.1016/0005-2736(79)90131-7
10.1038/newbio236011a0
10.1016/0022-2836(74)90103-X
10.1007/BF01870631
/ J. Membr. Biol. by Gordeski S. E. (1975)10.1172/JCI108390
10.1073/pnas.74.9.4033
10.1172/JCI109194
10.1016/S0021-9258(17)38006-7
/ J. Biol. Chem. by Miletic J. P. (1978)10.1111/j.1432-1033.1980.tb06033.x
10.1016/S0021-9258(19)86158-6
/ J. Biol. Chem. by Kane W. H. (1980)10.1182/blood.V54.5.1015.1015
/ Blood by Miletich J. P. (1979)10.1016/0002-9343(79)90392-9
10.1172/JCI109869
10.1021/bi00832a014
10.1016/S0021-9258(19)43070-6
10.1021/bi00776a003
10.1016/S0021-9258(19)44125-2
/ J. Biol. Chem. by Smith R. L. (1973)10.1016/S0021-9258(17)37898-5
{'key': 'e_1_2_3_36_2', 'first-page': '103', 'volume': '153', 'author': 'Kappeler R.', 'year': '1955', 'journal-title': 'Z. Klin. Med.'}
/ Z. Klin. Med. by Kappeler R. (1955)10.1016/S0021-9258(17)37945-0
10.1021/bi00833a063
10.3181/00379727-90-21985
10.1139/y59-099
/ Can. J. Biochem. Physiol. by Blig E. G. (1959){'key': 'e_1_2_3_41_2', 'first-page': '95', 'volume-title': 'The Regulation of Coagulation', 'author': 'Zwaal R. F. A.', 'year': '1980'}
/ The Regulation of Coagulation by Zwaal R. F. A. (1980)10.1146/annurev.bi.44.070175.003321
/ Annu. Rev. Biochem. by Samuelson B. (1975)10.1073/pnas.76.7.3238
/ Proc. Natl Acad. Sci. USA by Bell R. L. (1979)10.1172/JCI109339
/ J. Clin. Invest. by Rittenhouse‐Simmons S. (1979)10.1016/S0300-9084(78)80784-6
10.1111/j.1365-2141.1974.tb00469.x
/ Br. J. Haematol. by Lloyd J. V. (1974)10.1016/S0021-9258(19)83590-1
10.1021/bi00587a023
{'key': 'e_1_2_3_49_2', 'first-page': '474', 'volume': '84', 'author': 'Joist J. H.', 'year': '1974', 'journal-title': 'J. Lab. Clin. Med.'}
/ J. Lab. Clin. Med. by Joist J. H. (1974)10.1038/281690a0
10.1073/pnas.68.10.2564
10.1016/0304-4157(79)90012-1
10.1016/0005-2736(78)90417-0
10.1016/0005-2736(78)90191-8
10.1182/blood.V49.5.819.819
/ Blood by østerud B. (1977)10.1021/bi00616a013
Dates
Type | When |
---|---|
Created | 20 years, 5 months ago (March 3, 2005, 4:51 p.m.) |
Deposited | 1 year, 9 months ago (Nov. 23, 2023, 11:36 a.m.) |
Indexed | 1 month ago (July 26, 2025, 5:20 a.m.) |
Issued | 43 years, 6 months ago (Feb. 1, 1982) |
Published | 43 years, 6 months ago (Feb. 1, 1982) |
Published Online | 20 years, 5 months ago (March 3, 2005) |
Published Print | 43 years, 6 months ago (Feb. 1, 1982) |
@article{BEVERS_1982, title={Generation of Prothrombin‐Converting Activity and the Exposure of Phosphatidylserine at the Outer Surface of Platelets}, volume={122}, ISSN={1432-1033}, url={http://dx.doi.org/10.1111/j.1432-1033.1982.tb05898.x}, DOI={10.1111/j.1432-1033.1982.tb05898.x}, number={2}, journal={European Journal of Biochemistry}, publisher={Wiley}, author={BEVERS, Edouard M. and COMFURIUS, Paul and VAN RIJN, Jan L. M. L. and HEMKER, H. Coenraad and Robert F. A ZWAAL}, year={1982}, month=feb, pages={429–436} }