Document Detail

Opioid modulation of cell proliferation in the ventricular zone of adult zebra finches (Taenopygia guttata).
MedLine Citation:
PMID:  20495180     Owner:  NLM     Status:  MEDLINE    
Besides modulating pain, stress, physiological functions, motivation, and reward, the opioid system has been implicated in developmental and adult mammalian neurogenesis and gliogenesis. In adult male songbirds including zebra finches, neurons generated from the ventricular zone (VZ) of the lateral ventricles are incorporated throughout the telencephalon, including the song control nuclei, HVC, and area X. Although the endogenous opioid met-enkephalin is present in neurons adjacent to the VZ and is upregulated in song control regions during singing, it is not known whether the opioid system can modulate adult neurogenesis/gliogenesis in zebra finches. We used quantitative RT-PCR and in situ hybridization to demonstrate that μ- and δ-opioid receptors are expressed by the VZ of adult male zebra finches. Treating cultured VZ cells from male birds with the opioid antagonist naloxone led to an increase in cell proliferation measured by 5-bromo-2-deoxyuridine incorporation, whereas administering met-enkephalin had the opposite effect, compared with saline-treated cultures. Systemically administering naloxone (2.5 mg/kg body wt) to adult male zebra finches for 4 d also led to a significant increase in cell proliferation in the ventral VZ of these birds, compared with saline-treated controls. Our results show that cell proliferation is augmented by naloxone in the VZ adjacent to the anterior commissure, suggesting that the endogenous opioids modulate adult neurogenesis/gliogenesis by inhibiting cell proliferation in songbirds.
Nazia Khurshid; L Shahul Hameed; Sivaraj Mohanasundaram; Soumya Iyengar
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-05-21
Journal Detail:
Title:  FASEB journal : official publication of the Federation of American Societies for Experimental Biology     Volume:  24     ISSN:  1530-6860     ISO Abbreviation:  FASEB J.     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-10-04     Completed Date:  2010-11-01     Revised Date:  2012-02-15    
Medline Journal Info:
Nlm Unique ID:  8804484     Medline TA:  FASEB J     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3681-95     Citation Subset:  IM    
Division of Systems Neuroscience, National Brain Research Centre, Manesar, India.
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MeSH Terms
Base Sequence
Cell Proliferation / drug effects*
Cells, Cultured
Cerebral Ventricles / drug effects*,  metabolism
DNA Primers
Enkephalin, Methionine / pharmacology*
In Situ Hybridization, Fluorescence
Naloxone / pharmacology
Neurogenesis / drug effects
RNA, Messenger / genetics
Receptors, Opioid / genetics
Reverse Transcriptase Polymerase Chain Reaction
Reg. No./Substance:
0/DNA Primers; 0/RNA, Messenger; 0/Receptors, Opioid; 465-65-6/Naloxone; 58569-55-4/Enkephalin, Methionine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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