Anesthesia Actions and Outcomes Section Editor

نویسندگان

  • JOHN H. TINKER
  • Hugh C. Hemmings
  • Anna I. B. Adamo
  • Mary M. Hoffman
چکیده

Halothane and propofol stimulate activation of protein kinase C (PKC) in the presence of physiologically relevant lipid bilayer vesicles in vitro. The mechanism of this stimulation was characterized by analyzing the effects of halothane and propofol on the activation of purified rat brain PKC by its three essential activators, phosphatidylserine, diacylglycerol, and Ca’+, each of which is known to interact with the regulatory domain. Clinically relevant concentrations of halothane (2.4 ~01%) and propofol(200 FM) increased the V,,, without affecting the K, for phosphorylation of the artificial substrate histone Hl by PKC, and increased the sensitivity of PKC to activation by phosphatidylserine, diacylglycerol, and Ca’+. Halothane reduced the EC,, values for phosphatidylserine from 18 2 2.5 to 11 -C 0.6 mol% (P < 0.05), for diacylglycerol from 1.6 + 0.3 to 0.87 ?Z 0.2 mol% (P < 0.05) and for free Cazt from 4.5 + 1.0 to

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تاریخ انتشار 2003