Protein kinase C activates the non-selective cation channel in the rabbit portal vein

Masahiro Oike, Kenji Kitamura, Hirosi Kuriyama

Research output: Contribution to journalArticle

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Abstract

Effects of protein kinase C (PKC) on a non-selective cation channel current (Ins) were investigated using smooth-muscle cells of the rabbit portal vein. Neither bath application of the PKC activator, phorbol 12,13-dibutyrate (PDBu; 1 μM), nor the internal application of guanosine 5′-[γ-thio]-triphosphate (GTP[γS]; 3 μM) elicited any current at the holding potential of -60 mV. However, when GTP[γS] (3 μM) was present in the pipette, PDBu elicited a sustained inward current, in a concentration-dependent manner, at the holding potential of -60 mV. On the other hand, an inactive phorbol ester, 4α-phorbol 12,13-didecanoate (300 nM and 1 μM) had no effect on the membrane current even when GTP[γS] (3 μM) was in the pipette. The current amplitude induced by PDBu in the presence of GTP[γS] in the pipette was markedly reduced following pretreatment with 10 μM staurosporine, a PKC inhibitor. Neither a reduction in the Cl- concentration in the pipette nor addition of niflumic acid to the bath inhibited the inward current, and the reversal potential estimated from the current/voltage relationship was about -5 mV (physiological salt solution containing 5 mM Ba2+/high CSCl), which revealed that the main component of the current is Ins. An internal application of pertussis toxin markedly reduced the amplitude of Ins induced by PDBu. These results indicate that PKC activates a sustained component of Ins in cooperation with an activated pertussis-toxin-sensitive G protein in the rabbit portal vein.

Original languageEnglish
Pages (from-to)159-164
Number of pages6
JournalPflügers Archiv European Journal of Physiology
Volume424
Issue number2
DOIs
Publication statusPublished - Jul 1 1993

Fingerprint

Portal Vein
Guanosine Triphosphate
Protein Kinase C
Cations
Rabbits
Pertussis Toxin
Baths
Niflumic Acid
Phorbol 12,13-Dibutyrate
Staurosporine
Protein C Inhibitor
Guanosine
Phorbol Esters
Protein Kinase Inhibitors
GTP-Binding Proteins
Smooth Muscle Myocytes
Muscle
Salts
Cells
Membranes

All Science Journal Classification (ASJC) codes

  • Physiology
  • Clinical Biochemistry
  • Physiology (medical)

Cite this

Protein kinase C activates the non-selective cation channel in the rabbit portal vein. / Oike, Masahiro; Kitamura, Kenji; Kuriyama, Hirosi.

In: Pflügers Archiv European Journal of Physiology, Vol. 424, No. 2, 01.07.1993, p. 159-164.

Research output: Contribution to journalArticle

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