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[Catabolism of membrane phosphatidylcholines during early stages of mitogenic initiation of phosphoinositide cycle in lymphocytes].

Deacylation of the phosphatidylcholine fraction in plasma membranes of rat thymocytes and human blood lymphocytes was studied as well as its relationship to the activation of phosphoinositide-specific phosphodiesterase at early stages of mitogen-initiated phosphoinositide cycle. The data indicate that in lymphocyte membranes, enzymatic system of cascade deacylation of the phosphatidylcholine fraction includes calcium-activated phospholipase A1 and lysophospholipase. The enzyme system contributes to the rapid and reversible modification of the lipid bilayer of lymphocyte plasma membrane and can cooperate with phosphoinositide-specific phosphodiesterase during its activation at early stages of the initiation of phosphoinositide pathway during translocation of the external mitogenic signal.