Caspase-dependent cleavage of myosin light chain kinase (MLCK) is involved in TNF-α-mediated bovine pulmonary endothelial cell apoptosis

Irina Petrache, Konstantin Birukov, Ari L. Zaiman, Michael T. Crow, Haiteng Deng, Raj Wadgaonkar, Lewis H. Romer, Joe G N Garcia

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

Cytoskeletal proteins are key participants in the cellular progression to apoptosis. Our previous work demonstrated the critical dependence of actomyosin rearrangement and MLC phosphorylation in TNF-α-induced endothelial cell apoptosis. As these events reflect the activation of the multifunctional endothelial cell (EC) MLCK isoform, we assessed the direct role of EC MLCK in the regulation of TNF-α-induced apoptosis. Bovine pulmonary artery endothelial cells expressing either an adenovirus encoding antisense MLCK cDNA (Ad.GFP-AS MLCK) or a dominant/negative EC MLCK construct (EC MLCK-ATP-del) resulted in marked reductions in MLCK activity and TNF-α-mediated apoptosis. In contrast, a constitutively active EC MLCK lacking the carboxyl-terminal autoinhibitory domains (EC MLCK-1745) markedly enhanced the apoptotic response to TNF-α. Immunostaining in GFP-EC MLCK-expressing cells revealed colocalization of caspase 8 and EC MLCK along actin stress fibers after TNF-α. TNF-α induced the caspase-dependent cleavage of EC MLCK-1745 in transfected endothelial cells, which was confirmed by mass spectroscopy with in vitro cleavage by caspase 3 at LKKD (D1703). The resulting MLCK fragments displayed significant calmodulin-independent kinase activity. These studies convincingly demonstrate that novel interactions between the apoptotic machinery and EC MLCK exist that regulate the endothelial contractile apparatus in TNF-α-induced apoptosis.

Original languageEnglish (US)
Pages (from-to)407-416
Number of pages10
JournalFASEB Journal
Volume17
Issue number3
DOIs
StatePublished - Mar 1 2003
Externally publishedYes

Fingerprint

myosin light chain kinase
Myosin-Light-Chain Kinase
caspases
Endothelial cells
Caspases
endothelial cells
apoptosis
Endothelial Cells
lungs
Apoptosis
Lung
cattle
caspase-8
cytoskeletal proteins
Actomyosin
Stress Fibers
Calcium-Calmodulin-Dependent Protein Kinases
Phosphorylation
Cytoskeletal Proteins
Caspase 8

Keywords

  • Autoinhibitory domain
  • Blebbing
  • Cytoskeleton
  • Rho kinase
  • Stress fibers

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry
  • Cell Biology

Cite this

Caspase-dependent cleavage of myosin light chain kinase (MLCK) is involved in TNF-α-mediated bovine pulmonary endothelial cell apoptosis. / Petrache, Irina; Birukov, Konstantin; Zaiman, Ari L.; Crow, Michael T.; Deng, Haiteng; Wadgaonkar, Raj; Romer, Lewis H.; Garcia, Joe G N.

In: FASEB Journal, Vol. 17, No. 3, 01.03.2003, p. 407-416.

Research output: Contribution to journalArticle

Petrache, Irina ; Birukov, Konstantin ; Zaiman, Ari L. ; Crow, Michael T. ; Deng, Haiteng ; Wadgaonkar, Raj ; Romer, Lewis H. ; Garcia, Joe G N. / Caspase-dependent cleavage of myosin light chain kinase (MLCK) is involved in TNF-α-mediated bovine pulmonary endothelial cell apoptosis. In: FASEB Journal. 2003 ; Vol. 17, No. 3. pp. 407-416.
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