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Regulation of relaxin 3 gene expression via cAMP-PKA in a neuroblastoma cell line.

Relaxin 3 is expressed in neurons of the brain stem that inneravate wide areas of the forebrain. Relaxin 3 mRNA levels in these neurons are increased in response to restraint stress, and by central administration of corticotropin-releasing factor (CRF). In the present study, we observed that relaxin 3 was expressed in a mouse neuroblastoma cell line, Neuro2a, and investigated the intracellular signaling that activated relaxin 3 gene transcription in vitro. By means of a clone stably transfected with a relaxin 3 promoter-EGFP gene, we observed that dibutyryl cyclic AMP and forskolin increased the relaxin 3 promoter activity. These increases were inhibited by pretreatment with PKA inhibitors, H89 and KT5720. Moreover, the promoter activity was enhanced by CRF treatment after expression of CRF-R1 receptor on the cells. Taken together, these results indicate that relaxin 3 transcription is activated via the cAMP-PKA pathway in the downstream of CRF-R1.[1]

References

  1. Regulation of relaxin 3 gene expression via cAMP-PKA in a neuroblastoma cell line. Tanaka, M., Watanabe, Y., Yoshimoto, K. J. Neurosci. Res. (2009) [Pubmed]
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