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The whole-cell patch-clamp membrane capacitance measurement was used to monitor secretory activity in rat melanotrophs, while rab3AL, putative effector domain peptides of Rab3 small GTPases (20-30 kDa), were introduced into cytosol. In melanotrophs dialyzed with calcium free solutions membrane capacitance tends to decrease slightly. This decrease is further potentiated with GDPβS (500 μM). We found...
Synthetic peptides of the putative effector domain of members of the rab3 gene family of small GTP-binding proteins have been shown to have potent actions on vesicular transport and exocytosis [1,2]. Here, we use similar rab3-effector domain peptides to study their role in intracellular signalling in mast cells. We find that rab3-like peptides stimulate exocytosis and decrease cyclic 3',5'-AMP levels...
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