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PKC epsilon facilitates recovery of exocytosis after an exhausting stimulation

  • Signaling and Cell Physiology
  • Published:
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Abstract

It has been well documented that protein kinase Cs (PKCs) play multifaceted roles in regulating exocytosis of neurotransmitters and hormones. But the isoform-specific PKC effects are still poorly elucidated mainly because of the large variety of PKC isoforms and the dubious specificity of the commonly used pharmacological agents. In the present study, based on overexpression of wild-type or dominant negative PKCε, we demonstrate in neuroendocrine PC12 cells that PKCε, but not PKCα, facilitates recovery of exocytosis after an exhausting stimulation. Specifically, PKCε mediates fast recovery of the extent of exocytosis in a phosphatidylinositol biphosphate-dependent manner, likely through enhancing the rate of vesicle delivery and reorganization of cortical actin network. In addition, PKCε promotes fast recovery of vesicle release kinetics that is slowed after a strong stimulation. These experimental results may suggest a PKC-dependent mechanism relevant to the short-term plasticity of exocytosis in both neurons and neuroendocrine cells.

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Acknowledgement

This study was supported by an AcRF tier 2 grant (T206B3220) from the Ministry of Education (Singapore).

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  1. Division of Bioengineering, Nanyang Technological University, Singapore, 637457, Singapore

    Renhao Xue, Yanying Zhao, Luanyu Su, Feng Ye & Peng Chen

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  1. Renhao Xue
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Correspondence to Peng Chen.

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Xue, R., Zhao, Y., Su, L. et al. PKC epsilon facilitates recovery of exocytosis after an exhausting stimulation. Pflugers Arch - Eur J Physiol 458, 1137–1149 (2009). https://doi.org/10.1007/s00424-009-0697-4

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