Title : Synergism between thrombin and adrenaline (epinephrine) in human platelets. Marked potentiation of inositol phospholipid metabolism.

Pub. Date : 1988 Jul 15

PMID : 2845924






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1 Synergism between thrombin and adrenaline (epinephrine) in human platelets. Epinephrine coagulation factor II, thrombin Homo sapiens
2 Adrenaline alone (3.5-4.0 microM) did not cause a change in any parameter (phosphoinositide metabolism, aggregation and dense-granule secretion), but markedly enhanced the thrombin-induced responses over a narrow range of thrombin concentrations (0.03-0.08 units/ml). Epinephrine coagulation factor II, thrombin Homo sapiens
3 Adrenaline alone (3.5-4.0 microM) did not cause a change in any parameter (phosphoinositide metabolism, aggregation and dense-granule secretion), but markedly enhanced the thrombin-induced responses over a narrow range of thrombin concentrations (0.03-0.08 units/ml). Epinephrine coagulation factor II, thrombin Homo sapiens
4 The thrombin-induced hydrolysis of inositol phospholipids by phospholipase C, which was measured as the formation of [32P]PA, was potentiated by adrenaline, as was the increase in the levels of [32P]PIP2 and [32P]PIP. Epinephrine coagulation factor II, thrombin Homo sapiens
5 The presence of adrenaline caused a shift to the left for the thrombin-induced changes in the phosphoinositide metabolism, without affecting the maximal levels of 32P-labelled compounds obtained. Epinephrine coagulation factor II, thrombin Homo sapiens
6 A similar shift by adrenaline in the dose-response relationship was previously demonstrated for thrombin-induced aggregation and dense-granule secretion. Epinephrine coagulation factor II, thrombin Homo sapiens
7 Also, the narrow range of concentrations of thrombin over which adrenaline potentiates thrombin-induced platelet responses is the same for changes in phosphoinositide metabolism and physiological responses (aggregation and dense-granule secretion). Epinephrine coagulation factor II, thrombin Homo sapiens
8 Also, the narrow range of concentrations of thrombin over which adrenaline potentiates thrombin-induced platelet responses is the same for changes in phosphoinositide metabolism and physiological responses (aggregation and dense-granule secretion). Epinephrine coagulation factor II, thrombin Homo sapiens
9 Our observations clearly indicate that adrenaline directly or indirectly influences thrombin-induced changes in phosphoinositide metabolism. Epinephrine coagulation factor II, thrombin Homo sapiens