褪黑激素对U_(14)的抑制作用

Antitumor effect of melatonin on U_(14)

目的 探讨褪黑激素 (melatonin ,MT)对U14 的抑瘤作用及对常用化疗药环磷酰胺 (cytoxan ,CTX)的增效作用。方法 用小鼠移植性肿瘤模型 ,观察药物对荷U14 小鼠的肿瘤抑制率的影响。在可耐受剂量下治疗小鼠的实体瘤U14 ,观察药物对小鼠脾脏重量及肝脏组织结构的影响。结果 高剂量MT( 80mg·kg-1·d-1,sc)组对小鼠U14 有抑制作用 ,抑瘤率为 2 7 1% (P <0 0 5 )。高剂量组及低剂量MT( 4 0mg·kg-1·d-1,sc)组与CTX( 2 5mg·kg-1·d-1× 1,ip)合用对U14 的抑瘤作用可相加。高剂量MT与CTX合用对小鼠脾脏重量及肝脏组织结构均无明显影响。结论 MT有抑制U14 的作用 ,与CTX合用具有疗效相加的作用 ,毒性无明显增加。

AIM To study antitumor activity of melatonin in mice and its synergetic effects when MT combined with chemotherapeutic agents cytoxan(CTX). METHODS At a tolerable dose level,MT was administrated singlely or in combination with CTX to treat the transplanted murine solid tumor U 14 . The inhibition of tumor weight were observed. The weight of spleen and the hepatic cells' structure were also be measured. RESULTS The high dosed group of MT(80 mg·kg -1 ·d -1 ,sc) had a certain inhibition on the growth of the U 14 with inhibition rate of 27 1%. The low dosed group of MT(40 mg·kg -1 ·d -1 , sc) and the high dosed one combined with the CTX (25 mg·kg -1 ·d -1 ×1,ip) showed much pronounced than that of solely administration of MT. There was no significant influnce on the weight of spleen and the hepatic cells' structure. CONCLUSIONS The antitumor effect was observed by independent administration of MT. There was a synergism when MT combined with CTX but their toxicities were not obviously enhanced.