Document Detail

Growth hormone improves hippocampal adult cell survival and counteracts the inhibitory effect of prolonged sleep deprivation on cell proliferation.
MedLine Citation:
PMID:  21256199     Owner:  NLM     Status:  Publisher    
Sleep deprivation (SD) produces numerous deleterious changes in brain cells, including apoptosis. It has been demonstrated that growth hormone (GH) stimulates cell growth and counteracts apoptosis, although this anti-apoptotic effect has not been tested against SD. To determine the protective effect of GH administration on cell proliferation and survival in the dentate gyrus (DG) of the hippocampus after sleep deprivation; we injected Wistar adult rats with a low dose of recombinant human GH (rhGH 5ng/kg) per seven days and then we gently sleep deprived the animals for 48 consecutive hours. 5-Bromodeoxiuridine (BrdU) was administered to assess cell proliferation after the GH treatment and NeuN was used as marker of cell fate. Our results indicate that GH produced a three fold increase in the number of BrdU positive cells within the DG [Control=1044±106.38 cells, rhGH=2952±99.84 cells, P<0.01]. In contrast, 48h of SD significantly reduced cell proliferation but this effect was antagonized by the GH administration [SD=540±18.3 cells, rhGH+SD=1116±84.48 cells, P<0.004]. Paradoxically, SD and GH administration increased cell survival separately but no significantly compared with control animals. However, cell survival was increased in animals treated with rhGH+SD compared to rats injected with saline solution [P<0.04]. Within the survival cells, the percentage of neurons was higher in SD animals [95%] compared with saline group, while this percentage (NeuN positive cells) was increased in animals treated with rhGH+SD [120%] compared with rhGH [25%] alone. Our findings indicate that GH strongly promotes cell proliferation in the adult brain and also protects the hippocampal neuronal precursors against the deleterious effect of prolonged sleep loss.
Fabio García-García; Alberto K De la Herrán-Arita; Enrique Juárez-Aguilar; Citlalli Regalado-Santiago; Diana Millán-Aldaco; Carlos Blanco-Centurión; René Drucker-Colín
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-1-20
Journal Detail:
Title:  Brain research bulletin     Volume:  -     ISSN:  1873-2747     ISO Abbreviation:  -     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-1-31     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7605818     Medline TA:  Brain Res Bull     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011. Published by Elsevier Inc.
Instituto de Ciencias de la Salud, Departamento de Biomedicina, Universidad Veracruzana, Av. Luis Castelazo-Ayala s/n, Col. Industrial-Animas, Xalapa, Veracruz, México, C.P. 91190, Mexico.
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