alexa Up-regulation of the neuronal serotoninergic phenotype in vitro: BDNF and cAMP share Trk B-dependent mechanisms.
Pharmaceutical Sciences

Pharmaceutical Sciences

Biochemistry & Pharmacology: Open Access

Author(s): Rumajogee P, Madeira A, Verg D, Hamon M, Miquel MC

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Abstract The effects of brain-derived neurotrophic factor (BDNF) and cAMP on the neuronal serotoninergic phenotype were studied in primary cultures of E14 rat embryonic rostral raphe. Short treatments (for 18 h) with BDNF or dibutyryl-cAMP induced an almost two-fold increase in the number of serotoninergic neurones and a dramatic extension and ramification of their neurites. These changes were associated with marked increases in the levels of mRNAs encoding the serotonin transporter, the 5-HT1A and 5-HT1B receptors and the BDNF receptor tyrosine kinase B (TrkB). Concomitant blockade of tyrosine kinases by genistein suppressed all the up-regulating effects of BDNF and cAMP on 5-hydroxytryptamine (5-HT) neurones. These findings suggest that an auto-amplifying mechanism underlies the promoting effect of BDNF on the differentiation of serotoninergic neurones through TrkB activation, which is also triggered by cAMP.
This article was published in J Neurochem and referenced in Biochemistry & Pharmacology: Open Access

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