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- W2014090135 abstract "Lung cancer is the leading cause of cancer death worldwide. A diet rich in fruit and vegetables has been shown to reduce the lung cancer risk. However, clinical trials with beta-carotene and retinoids have disappointed, resulted in increased mortality from lung cancer and cardiovascular disease.We have investigated the effects of the two major retinol metabolites, 9-cis-retinoic acid (9-Cis-RA), and 13-cis-retinoic acid (13-Cis-RA), on cell proliferation (MTT assays), intracellular cAMP (cAMP immunoassays), PKA activation (non-radioactive PKA activation assays), and ERK1/2 phosphorylation (Western blots) in immortalized human small airway epithelial cells, HPL1D, a human lung adenocarcinoma cell line, NCI-H322, immortalized human bronchial epithelial cells, BEAS-2B, and in the human small cell lung carcinoma cell line, NCI-H69.Both retinoids increased intracellular cAMP and PKA activation in all cell lines. In BEAS-2B and NCI-H69 cells, the stimulation of cAMP/PKA reduced the phosphorylation of ERK1/2 and inhibited cell proliferation whereas phosphorylation of ERK1/2 and cell proliferation were increased in HPL1D and NCI-H322 cells.Our data have identified a novel mechanism of action of 9-Cis-RA and 13-Cis-RA: activation of PKA in response to increased cAMP. The observed stimulation of cAMP/PKA may inhibit the development of small cell lung carcinoma and other tumors derived from large airway epithelia whereas it may selectively promote the development of lung tumors derived from small airway epithelial cells, such as adenocarcinoma." @default.
- W2014090135 created "2016-06-24" @default.
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- W2014090135 date "2006-01-01" @default.
- W2014090135 modified "2023-09-23" @default.
- W2014090135 title "Cyclic adenosine monophosphate-dependent cell type-specific modulation of mitogenic signaling by retinoids in normal and neoplastic lung cells" @default.
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- W2014090135 doi "https://doi.org/10.1016/j.cdp.2006.07.008" @default.
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