Lim kinase regulates the development of olfactory and neuromuscular synapses

Dev Biol. 2006 May 1;293(1):178-90. doi: 10.1016/j.ydbio.2006.01.030. Epub 2006 Mar 10.

Abstract

Lim Kinase (Limk) belongs to a phylogenetically conserved family of serine/threonine kinases, which have been shown to be potent regulators of the actin cytoskeleton. Despite accumulating evidence of its biochemical actions, its in vivo function has remained poorly understood. The association of the Limk1 gene with Williams Syndrome indicates that proteins of this family play a role in the nervous system. To unravel the cellular and molecular functions of Limk, we have either knocked out or activated the Limk gene in Drosophila. At the neuromuscular junction, loss of Limk leads to enlarged terminals, while increasing the activity of Limk leads to stunted terminals with fewer synaptic boutons. In the antennal lobe, loss of Limk abolishes the ability of p21-activated kinase (Pak) to alter glomerular development. In contrast, increase in Limk function leads to ectopic glomeruli, a phenotype suppressible by the coexpression of a hyperactive Cofilin gene. These results establish Limk as a critical regulator of Cofilin function and synapse development, and a downstream effector of Pak in vivo.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Actin Depolymerizing Factors / metabolism
  • Actin Depolymerizing Factors / physiology
  • Animals
  • Brain / embryology
  • Brain / enzymology
  • Drosophila / embryology
  • Drosophila / enzymology
  • Lim Kinases
  • Neuromuscular Junction / embryology*
  • Neuromuscular Junction / enzymology*
  • Protein Kinases / physiology*
  • Protein-Serine-Threonine Kinases / metabolism
  • Protein-Serine-Threonine Kinases / physiology
  • Smell / physiology*
  • Synapses / enzymology*
  • p21-Activated Kinases

Substances

  • Actin Depolymerizing Factors
  • Protein Kinases
  • Lim Kinases
  • Protein-Serine-Threonine Kinases
  • p21-Activated Kinases