We have investigated the effects of the rat-specific vasoconstrictor agent norbormide on the mechanical and electrophysiological properties of rat non-vascular smooth muscles. Norbormide (50 microM) did not affect the resting tone of urinary bladder, tracheal, and duodenal rings. In all tissues, KCl-induced concentration-response curves were shifted downward by norbormide (5 and 50 microM). In urinary bladder and tracheal rings, norbormide inhibited contractile responses to carbachol only at the higher concentration (50 microM). In single gastric fundus myocytes, 50 microM norbormide inhibited L-type Ca(2+) current (I(Ca(L))) by about 60%, neither affecting both activation and inactivation rates of the current nor the current-voltage curve along the voltage axis. Our results indicate that rat non-vascular smooth muscles are relaxed by norbormide with a mechanism likely involving a reduction of Ca(2+) entry through L-type Ca(2+) channels.

Bova, S., Cavalli, M., Cima, L., Luciani, S., Saponara, S., Sgaragli, G.P., et al. (2003). Relaxant and Ca2+ channel blocking properties of norbormide on rat non-vascular smooth muscles. EUROPEAN JOURNAL OF PHARMACOLOGY, 470(3), 185-191.

Relaxant and Ca2+ channel blocking properties of norbormide on rat non-vascular smooth muscles.

SAPONARA, SIMONA;SGARAGLI, GIAN PIETRO;FUSI, FABIO
2003

Abstract

We have investigated the effects of the rat-specific vasoconstrictor agent norbormide on the mechanical and electrophysiological properties of rat non-vascular smooth muscles. Norbormide (50 microM) did not affect the resting tone of urinary bladder, tracheal, and duodenal rings. In all tissues, KCl-induced concentration-response curves were shifted downward by norbormide (5 and 50 microM). In urinary bladder and tracheal rings, norbormide inhibited contractile responses to carbachol only at the higher concentration (50 microM). In single gastric fundus myocytes, 50 microM norbormide inhibited L-type Ca(2+) current (I(Ca(L))) by about 60%, neither affecting both activation and inactivation rates of the current nor the current-voltage curve along the voltage axis. Our results indicate that rat non-vascular smooth muscles are relaxed by norbormide with a mechanism likely involving a reduction of Ca(2+) entry through L-type Ca(2+) channels.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11365/4196
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