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Leucinostatin A inhibits prostate cancer growth through reduction of insulin‐like growth factor‐I expression in prostate stromal cells
Author(s) -
Kawada Manabu,
Inoue Hiroyuki,
Ohba ShunIchi,
Masuda Tohru,
Momose Isao,
Ikeda Daishiro
Publication year - 2009
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.24915
Subject(s) - biology , stromal cell , cancer research , growth factor , prostate cancer , cell growth , cancer cell , prostate , cancer , microbiology and biotechnology , biochemistry , receptor , genetics
Abstract Targeting stroma in tumor tissues is an attractive new strategy for cancer treatment. We developed in vitro coculture system, in which the growth of human prostate cancer DU‐145 cells is stimulated by prostate stromal cells (PrSC) through insulin‐like growth factor I (IGF‐I). Using this system, we have been searching for small molecules that inhibit tumor growth through modulation of tumor‐stromal cell interactions. As a result, we have found that leucinostatins and atpenins, natural antifungal antibiotics, inhibit the growth of DU‐145 cells cocultured with PrSC more strongly than that of DU‐145 cells alone. In this study we examined the antitumor effects of these small molecules in vitro and in vivo . When DU‐145 cells were coinoculated with PrSC subcutaneously in nude mice, leucinostatin A was found to significantly suppress the tumor growth more than atpenin B. The antitumor effect of leucinostatin A in vivo was not obtained against the tumors of DU‐145 cells alone. RT‐PCR experiments revealed that leucinostatin A specifically inhibited IGF‐I expression in PrSC without effect on expressions of other IGF axis molecules. Leucinostatins and atpenins are known to abrogate mitochondrial functions. However, when we used mitochondrial DNA‐depleted, pseudo‐ρ 0 cells, we found that one of leucinostain A actions certainly depended on mitochondrial function, but it actually inhibited the growth of DU‐145 cells more strongly in coculture with pseudo‐ρ 0 PrSC and reduced IGF‐I expression in pseudo‐ρ 0 PrSC. Taken together, our results suggested that leucinostatin A inhibited prostate cancer cell growth through reduction of IGF‐I expression in PrSC.