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Distinct Contractile Systems for Electromechanical and Pharmacomechanical Coupling in Smooth Muscle

  • Valéria Lamounier-Zepter
  • Leonidas G. Baltas
  • Ingo Morano
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 538)

Abstract

The smooth muscle cells express diverse isoforms of the molecular motor Type II myosin. Three different genes coding for myosin heavy chains (MyHC) are expressed, namely one smooth-muscle specific (SM-MyHC), and two non-muscle- specific myosin heavy chain (NM-MyHC), NM-MyHCA, and NM-MyHCB, located on chromosomes 16, 22, and 17, respectively1. Different splice variants of the SM-MyHC are generated due to the alternatively spliced mutually exclusive exons 5b and 392, 3. Elimination of exon 5b in a knock-out mouse model demonstrated that a high contractile state depends on the presence of myosin with 5′-inserted heavy chains4.

Keywords

Myosin Heavy Chain Electromechanical Coupling Myosin Light Chain Kinase Phasic Contraction Tonic Contraction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 2003

Authors and Affiliations

  • Valéria Lamounier-Zepter
    • 1
  • Leonidas G. Baltas
    • 1
  • Ingo Morano
    • 1
    • 2
  1. 1.Max-Delbrück-Center for Molecular MedicineBerlinGermany
  2. 2.Johannes-Müller Institute of PhysiologyHumboldt-University (Charité)BerlinGermany

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