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LIM kinase-2 induces programmed necrotic neuronal death via dysfunction of DRP1-mediated mitochondrial fission

J-E Kim1, H J Ryu1, M J Kim1

  • 1Department of Anatomy and Neurobiology, College of Medicine, Hallym University, Chunchon, Kangwon-Do 200-702, Republic of Korea.

Cell Death and Differentiation
|February 25, 2014
PubMed

Insights

Researchers identified LIM kinase 2 (LIMK2) as a key player in programmed necrotic neuronal death. This pathway involves Rho kinase (ROCK), p27(Kip1), cyclin D1/CDK4, and DRP1, offering potential therapeutic targets for neuronal death.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Aberrant cell cycle protein activation contributes to neuronal death.
  • The specific mediators of cyclin D1/cyclin-dependent kinase 4 (CDK4)-induced neuronal death remain unclear.

Purpose of the Study:

  • To elucidate the role of LIM kinase 2 (LIMK2) in programmed necrotic neuronal death.
  • To identify the signaling pathway involved in cyclin D1/CDK4-mediated neuronal death.

Main Methods:

  • Investigated the expression of LIMK2 in neurons vulnerable to status epilepticus (SE).
  • Analyzed the impact of Rho kinase (ROCK) activation on p27(Kip1), cyclin D1/CDK4, LIMK2, and dynamic-related protein-1 (DRP1).
  • Assessed the effects of LIMK2 inhibition and DRP1 function rescue on SE-induced neuronal death.

Main Results:

  • ROCK activation led to p27(Kip1) downregulation, subsequently increasing cyclin D1/CDK4 levels in SE-vulnerable neurons.
  • The cyclin D1/CDK4 complex elevated LIMK2 expression independently of caspase-3 and receptor interacting protein kinase 1.
  • Upregulated LIMK2 inhibited DRP1-mediated mitochondrial fission, causing necrotic neuronal death.
  • Inhibiting LIMK2 or restoring DRP1 function reduced SE-induced programmed necrotic neuronal death.

Conclusions:

  • LIM kinase 2 (LIMK2) plays a critical role in programmed necrotic neuronal death.
  • The identified ROCK-p27(Kip1)-cyclin D1/CDK4-LIMK2-DRP1 pathway represents a novel mechanism of neuronal death.
  • This pathway presents potential therapeutic targets for treating neuronal death in conditions like status epilepticus.

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