Synthesis and biological evaluation of bombesin constrained analogues.
JOURNAL OF MEDICINAL CHEMISTRY(2000)
摘要
Analogues of bombesin which incorporate dipeptide or turn mimetics have been synthesized. One of them (compound 11) containing a seven-membered lactam ring revealed a good affinity for GRP/BN receptors on rat pancreatic acini (K-i value of 1.7 +/- 0.4 nM) and on Swiss 3T3 cells (K-i value of 1.0 +/- 0.2 nM). On the basis of this observation, antagonists containing the same dipeptide mimic were obtained by modification of the C-terminal part of the bombesin analogues. The most potent constrained compounds (15 and 17) were able to antagonize 1 nM bombesin-stimulated amylase secretion from rat pancreatic acini with high potency (K-i = 21 +/- 3 and 3.3 +/- 1.0 nM, respectively) and 10(-7) M bombesin-stimulated [H-3]thymidine incorporation into Swiss 3T3 cells (K-i = 7.8 +/- 2.0 and 0.5 +/- 0.1 nM, respectively).
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