Studies on antitumor cyclic hexapeptides RA obtained from Rubiae Radix, Rubiaceae. III. On derivatives of RA-V and their in vivo activities.
作者:HIDEJI ITOKAWA、KOICHI TAKEYA、NOBORU MORI、TORU SONOBE、NOBUAKI SERISAWA、TOSHINORI HAMANAKA、SUSUMU MIHASHI
DOI:10.1248/cpb.32.3216
日期:——
With the aim of obtaining compounds with strong antitumor activity and weak toxicity, we have synthesized a series of alkylethers, fatty acid esters, benzoates and other derivatives of RA-V, an antitumor cyclic hexapeptide discovered in Rubiae Radix, and examined their antitumor activities against P-388 lymphocytic leukemia. It was found that the introduction of C1 and C6 chains (hydrophobic coefficient log P=about 3.2 and 5.8, respectively) on the phenol moiety of RA-V gave the most desirable compounds in terms of antitumor activity and toxicity. The caproic ester of RA-V, the n-hexylether of RA-V and RA-VII (C1) also exhibited strong antitumor activity against other experimental tumors (L-1210 lymphocytic leukemia, B-16 melanoma and MM2 mammary carcinoma).
为了获得具有强抗癌活性和低毒性的化合物,我们合成了一系列由茜草根中发现的一种抗癌环己肽RA-V衍生的烷基醚、脂肪酸酯、苯甲酸酯等,并检验了它们对P-388淋巴细胞白血病的抗癌活性。发现将C1和C6链(疏水系数log P分别约为3.2和5.8)引入RA-V的酚部分所得到的化合物在抗癌活性和毒性方面最为理想。RA-V己酸酯、RA-V正己基醚和RA-VII(C1)也显示出对其他实验性肿瘤(L-1210淋巴细胞白血病、B-16黑色素瘤和MM2乳腺癌)的强抗癌活性。