Leucinostatin A inhibits prostate cancer growth through reduction of insulin‐like growth factor‐I expression in prostate stromal cells

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 h...

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Bibliographic Details
Published in:International journal of cancer 2010-02, Vol.126 (4), p.810-818
Main Authors: Kawada, Manabu, Inoue, Hiroyuki, Ohba, Shun‐Ichi, Masuda, Tohru, Momose, Isao, Ikeda, Daishiro
Format: Article
Language:English
Subjects:
Animals
Antineoplastic Agents - pharmacology
Antineoplastic Agents - therapeutic use
Biological and medical sciences
Cell Division - drug effects
Cell Line, Tumor
Coculture Techniques
DNA Primers
Humans
IGF‐I
Male
Medical sciences
Mice
Mice, Nude
Mitochondria - drug effects
Mitochondria - pathology
Mycotoxins - pharmacology
Mycotoxins - therapeutic use
natural compound
Nephrology. Urinary tract diseases
Peptides - pharmacology
Peptides - therapeutic use
prostate cancer
prostate stroma
Prostatic Neoplasms - drug therapy
Prostatic Neoplasms - pathology
Pyridones - pharmacology
Reverse Transcriptase Polymerase Chain Reaction
Stromal Cells - drug effects
Stromal Cells - pathology
tumor growth
Tumors
Tumors of the urinary system
Urinary tract. Prostate gland
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Summary: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‐ρ0 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‐ρ0 PrSC and reduced IGF‐I expression in pseudo‐ρ0 PrSC. Taken together, our results suggested that leucinostatin A inhibited prostate cancer cell growth through reduction of IGF‐I expression in PrSC.
ISSN:0020-7136
1097-0215
DOI:10.1002/ijc.24915