Norepinephrine and GTP-γ-S increase myofilament Ca2+ sensitivity in α-toxin permeabilized arterial smooth muscle

Junji Nishimura, Michael A Kolber, Cornelis van Breemen

Research output: Contribution to journalArticle

240 Citations (Scopus)

Abstract

A new method for preparing permeabilized smooth muscle fibers from rabbit mesenteric artery has been developed using α-toxin, a transmembrane pore-making exo-protein produced by Staphylococcus aureus. After α-toxin treatment the fibers developed tension as a function of Ca2+ concentration (EC50 = 890 nM). But they could not contract without added ATP, indicating ATP is permeable. When the sarcoplasmic reticulum was loaded with 5×10-7 M Ca2+ solution, NE induced a transient contraction in 2 mM EGTA 0 M Ca2+ solution and a transient and maintained contraction in 5×10-7 M Ca2+ solution. GTP-γ-S, a non-hydrolyzable analogue of GTP, substituted for NE in producing these contractile effects. The analysis of the relationship between Ca2+ and maintained tension revealed that NE and GTP-γ-S cause increases in Ca2+ sensitivity of myofilament shifting the EC50 to 280 nM and 160 nM, respectively. We conclude that NE or GTP-γ-S causes an increase in myofilament Ca2+ sensitivity and that G protein may be involved in receptor signal transduction system. α-Toxin is a useful tool to permeabilize the smooth muscle tissue to ions and small molecules without any damage of receptor and signal transduction system.

Original languageEnglish
Pages (from-to)677-683
Number of pages7
JournalBiochemical and Biophysical Research Communications
Volume157
Issue number2
DOIs
StatePublished - Dec 15 1988
Externally publishedYes

Fingerprint

Myofibrils
Guanosine Triphosphate
Smooth Muscle
Muscle
Norepinephrine
Signal transduction
Signal Transduction
Adenosine Triphosphate
Mesenteric Arteries
Fibers
Egtazic Acid
Sarcoplasmic Reticulum
GTP-Binding Proteins
Staphylococcus aureus
Ions
Tissue
Rabbits
Muscles
Molecules
Proteins

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

Cite this

Norepinephrine and GTP-γ-S increase myofilament Ca2+ sensitivity in α-toxin permeabilized arterial smooth muscle. / Nishimura, Junji; Kolber, Michael A; van Breemen, Cornelis.

In: Biochemical and Biophysical Research Communications, Vol. 157, No. 2, 15.12.1988, p. 677-683.

Research output: Contribution to journalArticle

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