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[Alpha-thrombin stimulation of heparin secretion by the peritoneal mast cells in rats]статья
Дата последнего поиска статьи во внешних источниках: 23 января 2020 г.
- Авторы: Umarova B.A., Khlgatian S.V., Strukova S.M.
- Журнал: Biulleten' eksperimental'no∎ biologii i meditsiny
- Том: 107
- Номер: 2
- Год издания: 1989
- Издательство: Administrativnoia Zdaniia Minzdrava Sssr
- Местоположение издательства: Moskva, Russia (Federation)
- Первая страница: 131
- Последняя страница: 133
- Аннотация: The interaction of alpha-thrombin with connective tissue-type mast cells (CTMC) purified by Ficoll density gradient centrifugation has been examined. It was demonstrated that exposure of CTMC to polymixin (widely used histamine liberator) (3 mg/ml) induced the release of heparin and histamine. Exposure of CTMC to 10(-11) M alpha-thrombin resulted in increase of heparin secretion by 75.5% in relation to basal level. CTMC which were stimulated by very low concentrations of alpha-thrombin (10(-11)-10(-8) M) can release high level of heparin, but not histamine. We have a suggestion that the thrombin specificity is connected with the additional recognition binding site for high molecular substrates (HMS) distinct from the active centre. Unlike alpha-thrombin which has both the active centre and the recognition site for HMS, beta/gamma-thrombin with catalytic activity but with disrupted recognition site induced the heparin release from mast cells only at higher concentrations than alpha-thrombin. It was revealed that DIP-alpha-thrombin without proteolytic activity was unable to activate mast cells in contrast to alpha-thrombin. We consider that alpha-thrombin induced release of heparin by CTMC account for proteolytic and hormone-like activity enzyme by means of both the active centre and the additional recognition site for HMS.
- Добавил в систему: Струкова Светлана Михайловна