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Pyridoxal‐5′‐phosphate phosphatase/chronophin inhibits long‐term potentiation induction in the rat dentate gyrus

Pyridoxal‐5′‐phosphate phosphatase/chronophin inhibits long‐term potentiation induction in the... Pyridoxal‐5′‐phosphate (PLP)‐phosphatase/chronophin (PLPP/CIN) directly dephosphorylates actin‐depolymerizing factor (ADF)/cofilin as well as PLP. Although PLPP/CIN plays a role in the regulation of F‐actin and vitamin B6 metabolism, there is no direct evidence to support a correlation between PLPP/CIN and F‐actin polymerization during long‐term potentiation (LTP) induction. In this study, we investigated whether the expression of PLPP/CIN is altered following LTP induction, and whether Tat‐PLPP/CIN transduction affects LTP induction in the rat dentate gyrus (DG). PLPP/CIN immunoreactivity was markedly decreased in dentate granule cells after the induction of LTP. Tat‐PLPP/CIN transduction (20 and 200 μg/kg) decreased the efficiency of high frequency stimulus‐induced potentiation of populations spike amplitude as compared to saline or Tat‐protein‐treated animals. The PLPP/CIN protein level showed an inverse correlation with phosphorylated ADF/cofilin levels and F‐actin content. These findings suggest that PLPP/CIN‐mediated actin dynamics may play an important role in the changes of morphological properties (dendritic spine reorganization) of the hippocampus in LTP. © 2009 Wiley‐Liss, Inc. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Hippocampus Wiley

Pyridoxal‐5′‐phosphate phosphatase/chronophin inhibits long‐term potentiation induction in the rat dentate gyrus

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References (57)

Publisher
Wiley
Copyright
Copyright © 2009 Wiley‐Liss, Inc.
ISSN
1050-9631
eISSN
1098-1063
DOI
10.1002/hipo.20568
pmid
19253407
Publisher site
See Article on Publisher Site

Abstract

Pyridoxal‐5′‐phosphate (PLP)‐phosphatase/chronophin (PLPP/CIN) directly dephosphorylates actin‐depolymerizing factor (ADF)/cofilin as well as PLP. Although PLPP/CIN plays a role in the regulation of F‐actin and vitamin B6 metabolism, there is no direct evidence to support a correlation between PLPP/CIN and F‐actin polymerization during long‐term potentiation (LTP) induction. In this study, we investigated whether the expression of PLPP/CIN is altered following LTP induction, and whether Tat‐PLPP/CIN transduction affects LTP induction in the rat dentate gyrus (DG). PLPP/CIN immunoreactivity was markedly decreased in dentate granule cells after the induction of LTP. Tat‐PLPP/CIN transduction (20 and 200 μg/kg) decreased the efficiency of high frequency stimulus‐induced potentiation of populations spike amplitude as compared to saline or Tat‐protein‐treated animals. The PLPP/CIN protein level showed an inverse correlation with phosphorylated ADF/cofilin levels and F‐actin content. These findings suggest that PLPP/CIN‐mediated actin dynamics may play an important role in the changes of morphological properties (dendritic spine reorganization) of the hippocampus in LTP. © 2009 Wiley‐Liss, Inc.

Journal

HippocampusWiley

Published: Nov 1, 2009

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