Title : A role for protein kinase C and its substrates in the action of valproic acid in the brain: implications for neural plasticity.

Pub. Date : 2002 Apr 26

PMID : 11937071






4 Functional Relationships(s)
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1 In the present study we have examined the effects of VPA on the expression of two prominent substrates for protein kinase C (PKC) in the brain, MARCKS and GAP-43, which have been implicated in actin-membrane plasticity and neurite outgrowth during neuronal differentiation, respectively, and are essential to normal brain development. Valproic Acid myristoylated alanine rich protein kinase C substrate Homo sapiens
2 Inhibition of PKC with the PKC-selective inhibitor, LY333531, prevented the VPA-induced down-regulation of membrane-associated MARCKS, but had no effect on the cytosolic MARCKS reduction or the GAP-43 up-regulation. Valproic Acid myristoylated alanine rich protein kinase C substrate Homo sapiens
3 Collectively, these data indicate that VPA induces neuronal differentiation, associated with a reduction in MARCKS expression and an increase in GAP-43 expression, consistent with the hypothesis that a reduction in MARCKS at the membrane may be permissive for cytoskeletal plasticity during neurite outgrowth. Valproic Acid myristoylated alanine rich protein kinase C substrate Homo sapiens
4 Collectively, these data indicate that VPA induces neuronal differentiation, associated with a reduction in MARCKS expression and an increase in GAP-43 expression, consistent with the hypothesis that a reduction in MARCKS at the membrane may be permissive for cytoskeletal plasticity during neurite outgrowth. Valproic Acid myristoylated alanine rich protein kinase C substrate Homo sapiens