Schneider-Rivas S, Paredes-Carbajal C, Mascher D, Angoa-Pérez M, Jaramillo-Gonzaléz E, Borgonio-Pérez G, Rivas-Arancibia S. EFFECTS OF TESTOSTERONE AND GROWTH HORMONE ON LONG-TERM RETENTION AND EXTINCTION OF A PASSIVE AVOIDANCE RESPONSE IN YOUNG AND AGED RATS.
Int J Neurosci 2009;
117:1443-56. [PMID:
17729155 DOI:
10.1080/00207450601125782]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Wistar rats were divided into two blocks: young and aged. Each block was then randomly divided into the following groups: (1) Control (saline solution), (2) Growth Hormone (GH), (3) Testosterone enanthate, and (4) GH plus testosterone enanthate. Animals were trained on a one-trial passive avoidance conditioning and tested for retention 24 h after training and thereafter twice a week until the extinction response occurred. Results showed that GH, testosterone, and GH plus testosterone improved long-term memory in young rats. Both GH and testosterone delayed the extinction process in young and aged rats. The GH-testosterone interaction delayed the extinction only in young rats.
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