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Cholinergic response of isolated rat atria to recombinant rat interferon-gamma.

Authors: Borda, E  Leiros, CP  Sterin-Borda, L  De Bracco, MM 
Citation: Borda E, etal., J Neuroimmunol. 1991 Apr;32(1):53-9.
Pubmed: (View Article at PubMed) PMID:1900518

Addition of recombinant rat interferon-gamma (IFN-gamma) to beating rat atria decreased the contractile strength in a dose-dependent manner. The effect was specific of IFN-gamma since it was abrogated by monoclonal anti-rat IFN-gamma. It required the activation of the cholinergic system of the heart as inhibition of both nicotinic (10(-7) M hexametonium) and muscarinic cholinoceptors (10(-7) M atropine) prevented the reaction. Hemicholinium (2 x 10(-5) M) and tetrodotoxin (5 x 10(-7) M) also reduced the response. Likewise, IFN-gamma potentiated the action of the muscarinic agonist carbachol. IFN-gamma simulated the biological effect of cholinergic agonists because: (a) it increased cGMP formation; (b) it decreased cAMP formation; and (c) it reduced heart contractility at doses that can be considered physiologic. IFN-gamma also modified the muscarinic receptor by interfering with the binding of the radiolabelled antagonist quinuclidinyl benzilate [( 3H]QNB). It is suggested that IFN-gamma binding to IFN-gamma receptors in the heart may lead to a cholinergic response by interaction of both receptor systems on the surface of atrial cells.

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CRRD Object Information
CRRD ID: 2311499
Created: 2009-07-21
Species: All species
Last Modified: 2009-07-21
Status: ACTIVE



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