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Possible Roles of Protein Kinase C in Neurotransmission

  • Chikako Tanaka
  • Naoaki Saito
  • Akiko Kose
  • Atsuko Ito
  • Kohkichi Hosoda
  • Motoyoshi Sakaue
  • Hisato Shuntoh
  • Naoki Nishino
  • Kohtaro Taniyama
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 236)

Abstract

Protein kinase C (PKC) is an ubiquitous Ca2+-activated phospholipiddependent protein kinase abundant in the central nervous system(1–4). This enzyme is activated by 1,2-diacylglycerol which transiently appears in the cell membrane, as a consequence of receptor-mediated and voltage-dependent hydrolysis of inositol phospholipids. The link of the phosphoinositide system to PKC seems to be that of a major second messenger system in the central nervous system and the possible involvement in significant steps in synaptic transmission have to be given attention. Until recently, PKC was thought to be a single entity, however, molecular cloning analysis has shown that there is a family of PKC-related genes(5–11). At least four subspecies of PKC (α, βI, βII and γ) are expresssed in the mammalian brain. Enzymatically, three major isozymes of PKC (types I, II and III) have been resolved from rat brains, using hydroxyapatite column chromatography(12). All subtypes were activated by diacylglycerol as well as tumor-promoting phorbol esters in the presence of Ca2+ and phosphatidylserine. They bound radioactive phorbol ester and showed similar kinetic properties, although the enzyme having the β-sequence was active at very low concentrations of Ca (8,13). The amino acid sequence of these three types has been identified by comparison with the enzyme separately expressed in the COS cells transfected by respective cDNAs-containing plasmids (14). Type I corresponds to the enzyme encoded with the γ-sequence. Type II is a mixture of βI- and βII-subspecies derived from alternative splicing of a single gene. Type III corresponds to α-subspecies. The αI-and βII-subspecies differ by only about 50 amino acid residues in the carboxyl-terminal regions, show similar kinetic properties and are not separable by conventional enzyme purification procedures. To characterize the tissue specificity of these subspecies, a specific antibody against each subspecies should be a pertinent tool. We present here the cell specific expression of each subspecies of PKC in the rat brain, determined using subspecies specific antibodies.

Keywords

Purkinje Cell Phorbol Ester Deep Cerebellar Nucleus Dorsal Cochlear Nucleus Inositol Phospholipid 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1988

Authors and Affiliations

  • Chikako Tanaka
    • 1
  • Naoaki Saito
    • 1
  • Akiko Kose
    • 1
  • Atsuko Ito
    • 1
  • Kohkichi Hosoda
    • 1
  • Motoyoshi Sakaue
    • 1
  • Hisato Shuntoh
    • 1
  • Naoki Nishino
    • 1
  • Kohtaro Taniyama
    • 1
  1. 1.Department of PharmacologyKobe University School of MedicineChuo-ku, Kobe 650Japan

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