Studies on Cardiac Ingredients of Plants. XIII. Chemical Modification of Gitoxin to Cardiotonic Compounds without Vascular Contractile Effect.
作者:Akito NAGATSU、Yukitaka NAKAMURA、Kouya TAKEMOTO、Kazutaka SHIBATOMI、Shin-ichi NAGAI、Taisei UEDA、Jinsaku SAKAKIBARA、Hiroyoshi HIDAKA、Michiko FUJITA、Yoshihiro HOTTA、Kazumi TAKEYA、Masahisa ASANO、Toshihiro HASHIMOTO、Yoshinori ASAKAWA
DOI:10.1248/cpb.45.599
日期:——
Nitrated gitoxins (4) and bufotoxin homologues with various lengths of alkyl chain at C-3 of the steroid nucleus (10) were prepared from gitoxin (1). The pharmacological activities of the resulting compounds (4 and 10) were evaluated by measurement of inhibitory effect on Na+, K+-adenosine triphosphatase (ATPase) prepared from dog kidney, positive inotropic effect (PIE) on isolated guinea-pig papillary muscle preparations, and the effect on smooth muscle using the mesenteric artery from spontaneously hypertensive rats. Most of the compounds showed a smaller contractile effect on the arterial muscle. Among these compounds, gitoxin 3''-nitrate (4g) exhibited the most desirable biological activities, such as PIE comparable to that of 1, 1.25 times wider concentration-dependent range than 1, and lack of contractile activity on vascular muscle.
以甲壳素(1)为原料制备了硝化甲壳素(4)和在甾体核的 C-3 处具有不同长度烷基链的布福毒素同族体(10)。通过测量对狗肾脏制备的 Na+、K+-腺苷三磷酸酶(ATPase)的抑制作用、对离体豚鼠乳头肌制备的正性肌力作用(PIE)以及对自发性高血压大鼠肠系膜动脉平滑肌的影响,评估了所得化合物(4 和 10)的药理活性。大多数化合物对动脉肌肉的收缩效应较小。在这些化合物中,3''-硝酸基托霉素(4g)表现出最理想的生物活性,如 PIE 与 1 相当,浓度依赖性范围比 1 广 1.25 倍,对血管肌肉没有收缩活性。