Abstract
Mastoparan induced a transient elevation of cytosolic free Ca2+ concentration ([Ca2+]cyt) in tobacco suspension culture cells. The mastoparan-induced [Ca2+]cyt elevation was inhibited by 8-(N,N-diethylamino)-octyl 3,4,5-trimethoxybenzoate-HCl and neomycin but not by depletion of extracellular Ca2+, suggesting that the elevation was the result of Ca2+ release from the intracellular stores caused by stimulation of phosphoinositide turnover. Hydrogen peroxide which has been shown to induce an oxidative burst in soybean cells by mastoparan treatment [L. Legendre, P.F. Heinstein, P.S. Low, Evidence for participation of GTP-binding proteins in elicitation of the rapid oxidative burst in cultured soybean cells, J. Biol. Chem., 267 (1992) 20140-20147], also induced a transient [Ca2+]cyt elevation in the tobacco cells. However, mastoparan did not induce an oxidative burst in the tobacco cells. Activation of a 50, a 75 and a 80 kDa protein kinases after the mastoparan-induced [Ca2+]cyt elevation was shown by an in-gel protein kinase assay. This activation was inhibited by neomycin, suggesting that the [Ca2+]cyt elevation is necessary for the mastoparan-induced activation of the protein kinases. The activation was inhibited also by pretre...Continue Reading
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