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MCC-555, also known as RWJ-241947, is a novel peroxisome proliferator–activated receptor γ ligand [1].

The PPARγ receptors mainly express in adipose tissue, colon and macrophages involved in regulating fatty acid storage and glucose metabolism. It has been identified that PPARγ is the major functional receptor for the thiazolidinedione class of insulin-sensitizing drugs. The PPARγ receptor is implicated in the processes of adipogenesis and systemic insulin action [2].

MCC-555 (5 μmol/L) exhibited an apoptotic activity in human colorectal cancer cells. MCC-555 significantly increased NAG-1 expression in a PPARγ-independent manner. In HCT-116 cells, treatment with MCC-555 induced apoptosis. MCC-555 affected NAG-1 mRNA stability. MCC-555 treatment induced rapid phosphorylation of ERK1/2 [1]. In various solid and hematological tumor cell lines, MCC-555 showed antiproliferative activity against prostate cancer cells, with the strongest effect against the androgen-independent PC-3 prostate cancer cells [2].

In male beige/nude/X-linked immunodeficient (BNX) mice, treatment with MCC-555 profoundly suppressed growth of PC-3 prostate cancer xenografts with prominent apoptosis, fibrosis, and inflammatory and giant cell reaction. The experimented mice showed significantly decreased cholesterol [3].

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