The regulation of smooth muscle contractility by zipper-interacting protein kinase

Eikichi Ihara, Justin A. MacDonald

Research output: Contribution to journalReview article

58 Citations (Scopus)

Abstract

Smooth muscle contractility is mainly regulated by phosphorylation of the 20 kDa myosin light chains (LC20), a process that is controlled by the opposing activities of myosin light chain kinase (MLCK) and myosin light chain phosphatase (MLCP). Recently, intensive research has revealed that various protein kinase networks including Rho-kinase, integrin-linked kinase, zipper-interacting protein kinase (ZIPK), and protein kinase C (PKC) are involved in the regulation of LC20 phosphorylation and have important roles in modulating smooth muscle contractile responses to Ca2+ (i.e., Ca2+ sensitization and Ca2+ desensitization). Here, we review the general background and structure of ZIPK and summarize our current understanding of its involvement in a number of cell processes including cell death (apoptosis), cell motility, and smooth muscle contraction. ZIPK has been found to induce the diphosphorylation of LC20 at Ser-19 and Thr-18 in a Ca2+-independent manner and to regulate MLCP activity directly through its phosphorylation of the myosin-targeting subunit of MLCP or indirectly through its phosphorylation of the PKC-potentiated inhibitory protein of MLCP. Future investigations of ZIPK function in smooth muscle will undoubtably focus on determining the mechanisms that regulate its cellular activity, including the identification of upstream signaling pathways, the characterization of autoinhibitory domains and regulatory phosphorylation sites, and the development of specific inhibitor compounds.

Original languageEnglish
Pages (from-to)79-87
Number of pages9
JournalCanadian Journal of Physiology and Pharmacology
Volume85
Issue number1
DOIs
Publication statusPublished - Jan 1 2007
Externally publishedYes

Fingerprint

Myosin-Light-Chain Phosphatase
Protein Kinases
Smooth Muscle
Phosphorylation
Protein Kinase C
Myosin-Light-Chain Kinase
rho-Associated Kinases
Myosin Light Chains
Myosins
Muscle Contraction
Cell Movement
Cell Death
Cell Count
Apoptosis
Research
Proteins

All Science Journal Classification (ASJC) codes

  • Physiology
  • Pharmacology
  • Physiology (medical)

Cite this

The regulation of smooth muscle contractility by zipper-interacting protein kinase. / Ihara, Eikichi; MacDonald, Justin A.

In: Canadian Journal of Physiology and Pharmacology, Vol. 85, No. 1, 01.01.2007, p. 79-87.

Research output: Contribution to journalReview article

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