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Effect of Intra-Hippocampal Injection of Human Recombinant Growth Hormone on Synaptic Plasticity in the Nucleus Basalis Magnocellularis-Lesioned Aged Rats; [Efeito Da Injecao Intrahipocampal De Hormonio Do Crescimento Humano Recombinante Sobre a Plasticidade Sinaptica Em Ratos Envelhecidos Lesados Do Nucleo Basalis Magnocellularis] Publisher Pubmed



Malek M1 ; Sarkaki A2, 4 ; Zahediasl S3 ; Rajaei Z1 ; Farbood Y2, 4
Authors
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Authors Affiliations
  1. 1. Isfahan University of Medical Sciences, School of Medicine, Department of Physiology, Isfahan, Iran
  2. 2. Ahvaz Jundishapur University of Medical Sciences, Physiology Research Center, Ahvaz, Iran
  3. 3. Shaheed Beheshti University of Medical Sciences, Research Institute for Endocrine Sciences, Endocrine Research Center, Tehran, Iran
  4. 4. Ahvaz Jundishapur University of Medical Sciences, School of Medicine, Department of Physiology, Ahvaz, Iran

Source: Arquivos de Neuro-Psiquiatria Published:2017


Abstract

In this study, we proposed that administration of hippocampal growth hormone in ageing animals with growth hormone deficiency can compensate long-term potentiation and synaptic plasticity in nucleus basalis magnocellularis (NBM)-lesioned rats. Aged male Wistar rats were randomly divided into six groups (seven in each) of sham-operated healthy rats (Cont); NBM-lesioned rats (L); NBM-lesioned rats and intrahippocampal injection of growth hormone vehicle (L + Veh); NBM-lesioned and intrahippocampal injection of growth hormone (10, 20 and 40 μg.2 μl-1) (L + GH). In vivo electrophysiological recording techniques were used to characterize maintenance of long-term potentiation at distinct times (1, 2, 3, 24 and 48 hours) after high-frequency stimulation. The population spike was enhanced significantly for about 48 hours following tetanic stimulation in rats treated with a dose-dependent growth hormone compared to the vehicle group (p < 0.05), possibly through neuronal plasticity and neurogenesis in affected areas. © 2017, Associacao Arquivos de Neuro-Psiquiatria. All rights reserved.