Actin-myosin-based Contraction is Responsible for Apoptotic Nuclear Disintegration

Overview

Journal J Cell Biol

Specialty Cell Biology

Date 2005 Jan 20

PMID 15657395

Citations 93

Authors

Daniel R Croft

Mathew L Coleman

Shuixing Li

David Robertson

Teresa Sullivan

Colin L Stewart

Michael F Olson

Affiliations

Soon will be listed here.

Abstract

Membrane blebbing during the apoptotic execution phase results from caspase-mediated cleavage and activation of ROCK I. Here, we show that ROCK activity, myosin light chain (MLC) phosphorylation, MLC ATPase activity, and an intact actin cytoskeleton, but not microtubular cytoskeleton, are required for disruption of nuclear integrity during apoptosis. Inhibition of ROCK or MLC ATPase activity, which protect apoptotic nuclear integrity, does not affect caspase-mediated degradation of nuclear proteins such as lamins A, B1, or C. The conditional activation of ROCK I was sufficient to tear apart nuclei in lamin A/C null fibroblasts, but not in wild-type fibroblasts. Thus, apoptotic nuclear disintegration requires actin-myosin contractile force and lamin proteolysis, making apoptosis analogous to, but distinct from, mitosis where nuclear disintegration results from microtubule-based forces and from lamin phosphorylation and depolymerization.

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