Our quest to isolate and characterize natural products with in vitro solid tumor selectivity is driven by access to repositories of Indo-Pacific sponge extracts. In this project an extract of a species of Haplosclerida sponge obtained from the US NCI Natural Products Repository displayed, by in vitro disk diffusion assay (DDA) and IC₅₀ determinations, selective cytotoxicity with modest potency to a human pancreatic cancer cell line (PANC-1) relative to the human lymphoblast leukemia cell line (CCRF-CEM). Two brominated indoles, the known 6-bromo conicamin (1) and the new derivative, 6-Br-8-keto-conicamin A (2), were identified and 2 (IC₅₀ 1.5 μM for the natural product vs 4.1 μM for the synthetic material) was determined to be responsible for the cytotoxic activity of the extract against the PANC-1 tumor cell line. The new natural product and ten additional analogs were prepared for further SAR testing.

我们对具有体外实体瘤选择性的天然产物的分离和表征的追求是通过访问印度太平洋海绵提取物存储库来推动的。在该项目中，通过体外纸片扩散测定 (DDA) 和 IC ₅₀测定，从美国 NCI 天然产物存储库获得的一种单链海绵的提取物显示，对人胰腺癌细胞系 (PANC- 1)相对于人淋巴细胞白血病细胞系(CCRF-CEM)。鉴定出两种溴化吲哚，即已知的 6-溴锥虫胺 ( 1 ) 和新衍生物 6-Br-8-酮-锥虫胺 A ( 2 )，2（天然产物的 IC ₅₀为 1.5 μM，天然产物的 IC 50 为 4.1 μM）合成材料）被确定为提取物针对 PANC-1 肿瘤细胞系的细胞毒活性的原因。新的天然产品和十种其他类似物已准备好进行进一步的 SAR 测试。