ZFIN ID: ZDB-PUB-070924-8
A cardiac myosin light chain kinase regulates sarcomere assembly in the vertebrate heart
Seguchi, O., Takashima, S., Yamazaki, S., Asakura, M., Asano, Y., Shintani, Y., Wakeno, M., Minamino, T., Kondo, H., Furukawa, H., Nakamaru, K., Naito, A., Takahashi, T., Ohtsuka, T., Kawakami, K., Isomura, T., Kitamura, S., Tomoike, H., Mochizuki, N., and Kitakaze, M.
Date: 2007
Source: J. Clin. Invest.   117(10): 2812-2824 (Journal)
Registered Authors: Kawakami, Koichi
Keywords: none
MeSH Terms:
  • Adult
  • Aged
  • Amino Acid Sequence
  • Animals
  • Cardiac Myosins/metabolism
  • Cardiac Output, Low/enzymology*
  • Cardiac Output, Low/genetics
  • Cardiac Output, Low/pathology
  • Cells, Cultured
  • Cloning, Molecular
  • Embryo, Nonmammalian/metabolism
  • Female
  • Heart/embryology*
  • Humans
  • Male
  • Middle Aged
  • Molecular Sequence Data
  • Myocardium/enzymology
  • Myocardium/ultrastructure*
  • Myocytes, Cardiac/metabolism
  • Myocytes, Cardiac/ultrastructure
  • Myosin Light Chains/metabolism
  • Myosin-Light-Chain Kinase/antagonists & inhibitors
  • Myosin-Light-Chain Kinase/genetics
  • Myosin-Light-Chain Kinase/metabolism*
  • Myosin-Light-Chain Kinase/physiology*
  • Oligonucleotide Array Sequence Analysis
  • Oligoribonucleotides, Antisense/pharmacology
  • Organogenesis*/genetics
  • Rats
  • Sarcomeres/metabolism*
  • Up-Regulation
  • Zebrafish/embryology
  • Zebrafish/genetics
  • Zebrafish/metabolism
  • Zebrafish Proteins/antagonists & inhibitors
  • Zebrafish Proteins/genetics
  • Zebrafish Proteins/physiology*
PubMed: 17885681 Full text @ J. Clin. Invest.
Marked sarcomere disorganization is a well-documented characteristic of cardiomyocytes in the failing human myocardium. Myosin regulatory light chain 2, ventricular/cardiac muscle isoform (MLC2v), which is involved in the development of human cardiomyopathy, is an important structural protein that affects physiologic cardiac sarcomere formation and heart development. Integrated cDNA expression analysis of failing human myocardia uncovered a novel protein kinase, cardiac-specific myosin light chain kinase (cardiac-MLCK), which acts on MLC2v. Expression levels of cardiac-MLCK were well correlated with the pulmonary arterial pressure of patients with heart failure. In cultured cardiomyocytes, knockdown of cardiac-MLCK by specific siRNAs decreased MLC2v phosphorylation and impaired epinephrine-induced activation of sarcomere reassembly. To further clarify the physiologic roles of cardiac-MLCK in vivo, we cloned the zebrafish ortholog z-cardiac-MLCK. Knockdown of z-cardiac-MLCK expression using morpholino antisense oligonucleotides resulted in dilated cardiac ventricles and immature sarcomere structures. These results suggest a significant role for cardiac-MLCK in cardiogenesis.