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Expression of peroxisome proliferator-activated receptor (PPAR)-gamma in human lung cancer
K Inoue1, Y Kawahito, Y Tsubouchi
1First Department of Internal Medicine, Kyoto Prefectural University of Medicine, Japan.
Abstract:
The peroxisome proliferator-activated receptor (PPAR)-gamma is a member of the steroid nuclear receptors. Recent studies have demonstrated that PPAR-gamma is expressed in several cancer cells. We examined the PPAR-gamma expression in both normal lung and major types of human lung cancer. The expression of PPAR-gamma mRNA was detected in 2 out of 3 normal lung tissues and its protein was detected in 3 out of 5 normal lung tissues. In contrast, a small cell carcinoma cell line and all other types of lung cancer tissues expressed PPAR-gamma mRNA and its protein. Immunoreactive PPAR-gamma is strongly expressed in cancer cells and moderately in mononuclear cells, endothelial cells and fibroblasts of lung cancer tissues. Our results suggest that PPAR-gamma may play an important role in the pathogenesis and/or progression of lung cancer, and may be a novel therapeutical target for therapy of lung cancer.
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