-transparent.png){kind=logo}
The dissociating and/or residual inhibitory effects of bopindolol from beta-adrenoceptors of atria strips pretreated with this drug which was then washed out with buffers on the responses to isoprenaline were determined and compared with those of propranolol, pindolol, atenolol, and the two active metabolites of bopindolol: 18-502 and 20-785. Low concentrations of bopindolol (10(-9) to 10(-8) mol/l) and the active metabolite 18-502 (10(-9) mol/l) produced rightward shifts of the concentration-response curves. On the other hand, high concentrations of bopindolol (10(-7) mol/l) and metabolite 18-502 (10(-8) and 10(-7) mol/l) produced a reduced maximum response by isoprenaline, suggesting that these nonparallel rightward shifts have pD2 values of 7.57 (bopindolol) and 7.67 (18-502), respectively, at 0 min after washout with buffers. Pindolol (10(-7) mol/l) and propranolol (10(-7) and 10(-8) mol/l) also produced a rightward shift of isoprenaline response curves, and these concentration-response curves in guinea pig atria strips pretreated with pindolol (10(-7) mol/l) and propranolol (10(-6) mol/l) recovered to control levels. Neither of these drugs, however, reduced the maximum response by isoprenaline. A high concentration (10(-5) mol/l) of atenolol was required for a rightward shift of the isoprenaline concentration-response curve, and this drug also did not reduce the maximum response. Thus, we conclude that bopindolol and metabolite 18-502 slowly dissociate and act as noncompetitive beta-antagonists rather than easily reversible beta-adrenoceptor antagonists.
Y Hosohata, and
K Hattori, and
Y Shen, and
M Okuyama, and
H Kaneko, and
T Ohnuki, and
J Suzuki, and
T Nagatomo
December 1983,
The Journal of pharmacy and pharmacology,
Y Hosohata, and
K Hattori, and
Y Shen, and
M Okuyama, and
H Kaneko, and
T Ohnuki, and
J Suzuki, and
T Nagatomo
January 1980,
British journal of pharmacology,
Y Hosohata, and
K Hattori, and
Y Shen, and
M Okuyama, and
H Kaneko, and
T Ohnuki, and
J Suzuki, and
T Nagatomo
February 1992,
Arzneimittel-Forschung,
Y Hosohata, and
K Hattori, and
Y Shen, and
M Okuyama, and
H Kaneko, and
T Ohnuki, and
J Suzuki, and
T Nagatomo
January 1981,
Postgraduate medical journal,
Y Hosohata, and
K Hattori, and
Y Shen, and
M Okuyama, and
H Kaneko, and
T Ohnuki, and
J Suzuki, and
T Nagatomo
February 1974,
Archives internationales de pharmacodynamie et de therapie,
Y Hosohata, and
K Hattori, and
Y Shen, and
M Okuyama, and
H Kaneko, and
T Ohnuki, and
J Suzuki, and
T Nagatomo
January 1998,
Journal of smooth muscle research = Nihon Heikatsukin Gakkai kikanshi,
Y Hosohata, and
K Hattori, and
Y Shen, and
M Okuyama, and
H Kaneko, and
T Ohnuki, and
J Suzuki, and
T Nagatomo
March 1990,
The Journal of pharmacology and experimental therapeutics,
Y Hosohata, and
K Hattori, and
Y Shen, and
M Okuyama, and
H Kaneko, and
T Ohnuki, and
J Suzuki, and
T Nagatomo
December 1999,
Pharmacology,
Y Hosohata, and
K Hattori, and
Y Shen, and
M Okuyama, and
H Kaneko, and
T Ohnuki, and
J Suzuki, and
T Nagatomo
February 1993,
European journal of pharmacology,
Y Hosohata, and
K Hattori, and
Y Shen, and
M Okuyama, and
H Kaneko, and
T Ohnuki, and
J Suzuki, and
T Nagatomo
July 1999,
European journal of pharmacology,
