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Leptin modulates norepinephrine-mediated melatonin synthesis in cultured rat pineal gland.
MedLine Citation:
PMID:  23936817     Owner:  NLM     Status:  In-Data-Review    
Pineal melatonin synthesis can be modulated by many peptides, including insulin. Because melatonin appears to alter leptin synthesis, in this work we aimed to investigate whether leptin would have a role on norepinephrine- (NE-)mediated melatonin synthesis in cultured rat pineal glands. According to our data, cultured rat pineal glands express leptin receptor isoform b (Ob-Rb). Pineal expression of Ob-Rb mRNA was also observed in vivo. Administration of leptin (1 nM) associated with NE (1 µM) reduced melatonin content as well as arylalkylamine-N-acetyl transferase (AANAT) activity and expression in cultured pineal glands. Leptin treatment per se induced the expression of STAT3 in cultured pineal glands, but STAT3 does not participate in the leptin modulation of NE-mediated pineal melatonin synthesis. In addition, the expression of inducible cAMP early repressor (ICER) was further induced by leptin challenge when associated with NE. In conclusion, leptin inhibition of pineal melatonin synthesis appears to be mediated by a reduction in AANAT activity and expression as well as by increased expression of Icer mRNA. Peptidergic signaling within the pineal gland appears to be one of the most important signals which modulates melatonin synthesis; leptin, as a member of this system, is not an exception.
Rodrigo Antonio Peliciari-Garcia; Jéssica Andrade-Silva; José Cipolla-Neto; Carla Roberta de Oliveira Carvalho
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Publication Detail:
Type:  Journal Article     Date:  2013-07-01
Journal Detail:
Title:  BioMed research international     Volume:  2013     ISSN:  2314-6141     ISO Abbreviation:  Biomed Res Int     Publication Date:  2013  
Date Detail:
Created Date:  2013-08-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101600173     Medline TA:  Biomed Res Int     Country:  United States    
Other Details:
Languages:  eng     Pagination:  546516     Citation Subset:  IM    
Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, Avenue Professor Lineu Prestes 1524, Room 118, 05508-900 São Paulo, SP, Brazil.
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