Abstract
Vascular relaxation action of crude extracts of two kinds of Coptidis rhizoma (Coptis chinensis andCoptis japonica, Ranunculaceae) was investigated and compared with that of berberine and palmatine, active alkaloid components of these plants. The results show that total extracts, berberine, and palmatine induced a concentration-dependent vasodilatation of rat thoracic aorta contracted with phenylephrine (PE). Palmatine, unlike to berberine, did not inhibit contraction induced by KCl. In calcium-free media, not only berberine but also crude extracts inhibited calcium-induced contraction. Furthermore, pretreatment of crude extracts inhibited contraction induced by PE noncompetitively. In PE-induced contraction, berberine was 2.5 times more potent thanCoptis chinensis in the relaxation of rat aorta in terms of IC50 values. Anlaysis of the effects of crude extracts on the Emax and IC50 (PE)/IC50 (KCl) ratios provides information on selectivity and indicates that extracts exhibit greater inhibition of the contrac tile response induced by PE than by KCl. We concluded that crude extracts have α-adrenoceptor blocking action and possesses inhibitory effect on calcium influx, which may be at least in part responsible for the antihypertensive action.
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References Cited
Amin, A.H., Subbauah, T.V. and Abbasi, K.M., Berberine sulphate, Antomicrobial activity, bioassay and mode of action.Can. J. Microbiol., 15, 1067–1076 (1969).
Bolton, T.B., Mechanism of action of transmitter and other substances on smooth muscle.Physiol. Rev., 59, 606 (1979).
Bova, S., Padrini, R., Goldman, W.F., Berman, D.M., and Cargnelli, G., On the mechanism of vasodilating action of berberine: possible role of inositol lipid signalling system.J. Pharmacol. Exp. Ther. 261, 318–323 (1992).
Chang, K.C., Lim, J.K. and Park, C.W., Pharmacological evaluation of GS 389, a novel tetrahydroisoquinoline analog related to higenamine, on vascular smooth muscle.Life Sci., 51, 67–74 (1992).
Chang, K.C., Ko, H.J., Cho, S.D., Yoon, Y.J. and Kim, J.H., Pharmacological characterization of effects of verapamil and GS 283 on isolated guinea pig and rat trachealis.Eur. J. Pharmacol., 236, 51–57 (1993).
Chang, K.C., Chong, W.S. and Lee, I.J., Different pharmacological characteristics of structurally similar benzylisoquinoline analogs, papaverine, higenamine, and GS 389, on isolated rat aorta and heart.Can. J. Physiol. Pharmacol., 72, 327–334 (1994).
Chiou, W-F., Yen, M-H. and Chen, C-F., Mechanism of vasodilatory effect of berberine in rat mesentery artery.Eur. J. Pharmacol., 204, 35–40 (1991).
Chun, Y.T., Yip, T.T., Lau, K.L., Kong, Y.C. and Sankawa, U., A biochemical study on the hypotensive effect of berberine in rats.Gen. Pharmacol., 10, 177–182 (1979).
Desai, A.B., Shah, K.M. and Shah, D.M., Berberine in the treatment of diarrhea.Indian Pediatr., 8, 462–465 (1971).
Godfraind, T., Mechanisms of action of calcium entry blockers.Fed. Proc., 40, 2866 (1981).
Hof, R.P., Scholtysik, G., Loutzenhiser, R., Vourela, H.H. and Neumann, P., PN-200-100, a new calcium antagonist: electrophysiological, inotropic, and chronotropic effects of guinea pig myocardial tissue and effects on contraction and calcium uptake of rabbit aorta.J. Cardiovas. Pharmacol., 6, 399–403 (1984).
King, V.F., Garcia, M.L., Himmel, D., Reuben, J.P., Lam, Y.T., Pan, J., Han, G. and Kaczorowski, G.L., Interaction of tetrandrine with slowly inactivating calcium channels.J. Biol. Chem., 263, 2238–2244 (1988).
Lacroix, P., Lonee, P. and Foster, M.C., Diproteverine (BRL 40015): a new type of calcium antagonist with potential antianginal properties.Eur. J. Pharmacol., 192, 317–327 (1991).
Lee, Y.S., Kim, C.H., Yun-Choi, H.S. and Chang, K.C., Cardiovascular effect of a naphthylmethylsubstituted tetrahydroisoquinoline, YS 49, in rat and rabbit.Life Sci., 55, PL 415–420 (1995).
Ludan, A.C., Current management of acute diarrhea. Use and abuse of drug therapy.Drugs, 36 (suppl. 4), 18–25 (1988).
Nicolas, A.J., Motley, E.D. and Ruffolo, R.R.Jr., Effects of pertussis toxin treatment on postjunctional alpha-1 and alpha-2 adrenoceptor function in the cardiovascular system of the pithed rat.J. Pharmacol. Exp. Ther., 249, 203–209 (1989).
Rabbani, G.H., Butler, T., Knight, J., Sanyal, S.C. and Alam, K., Randomized controlled trial of berberine in patients with severe congestive heart failure.Clin. Cardiol., 11, 253–260 (1988).
Ruffolo, R.R. Jr., Morgan, E.L. and Messick, K., Possible relationship between receptor reserve and the differential antagonism of alpha-1 and alpha-2 adrenoceptor-mediated pressor responses by calcium channel antagonists in the pithed rat.J. Pharmacol. Exp. Ther., 230, 587–594 (1984).
Ruffolo, R.R. Jr., Nicolas, A.J., Stadel, J.M. and Hielle, J.P., Structure and function of α-adrenoceptors.Pharmacol. Rev., 43, 475–505 (1991a).
Ruffolo, R.R. Jr., Motley, E.D. and Nicolas, A.J., The effect of pertussis toxin in α1-adrenoceptor-mediated vasoconstriction by the full agonist, cirazoline, and the partial agonist (−)-dobutamine, in pithed rats.Fund. Clin. Pharmacol., 5, 11–23 (1991b).
Ryu, B.S., Studies on pharmacological effects of Coptis rhizoma and the quality estimation of berberine. Ph.D. thesis, Kyung Hee University (1992).
Sabir, M. and Bhide, N.K., Study of some pharmacological actions of berberine.Indian J. Physiol. Pharmacol., 15, 111–112 (1971).
Shaffer, J.E., Inotropic and chronotropic activity of berberine on isolated guinea pig atria.J. Cardiovas. Pharmacol., 7, 307–315 (1985).
Subbaiah, T.V. and Amin, A.H., Effects of berberine sulfate on Entamoeba histolytica.Nature, 215, 527–528 (1967).
Taylor, C.T. and Baird, A.W., Berberine inhibition of electrogenic ion transport in rat colon.Br. J. Pharmacol., 116, 2667–2672 (1995).
Triggle, D.J., Langs, D.A. and Janis, R.A., Ca++ channels ligands: structure-function relationships of the 1,4-dihydropyridines.Med. Res. Rev., 9, 123–180 (1989).
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Lee, D.U., Chang, K.C. Calcium channel blocking and α-adrenoceptor blocking action of Coptidis rhizoma extracts and their alkaloid components in rat aorta. Arch. Pharm. Res. 19, 456–461 (1996). https://doi.org/10.1007/BF02986011
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DOI: https://doi.org/10.1007/BF02986011