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Front Psychiatry

Title:		Testosterone Acts Within the Medial Amygdala of Rats to Reduce Innate Fear to Predator Odor Akin to the Effects of Toxoplasma gondii Infection
Author(s):		Singh DK; Hari Dass SA; Abdulai-Saiku S; Vyas A;
Address:		"School of Biological Sciences, Nanyang Technological University, Singapore, Singapore"
Journal Title:		Front Psychiatry
Year:		2020
Volume:		20200702
Issue:
Page Number:		630 -
DOI:		10.3389/fpsyt.2020.00630
ISSN/ISBN:		1664-0640 (Print) 1664-0640 (Electronic) 1664-0640 (Linking)
Abstract:		"Rats infected with the protozoan Toxoplasma gondii exhibit a reduced aversion to cat odor. This behavioral change is thought to increase trophic transmission of the parasite. Infected male rats also show a greater testicular synthesis of testosterone and epigenetic change in arginine vasopressin within the medial amygdala. Here, we show that exogenous supply of testosterone within MeA of uninfected castrates recapitulates reduction in innate fear akin to behavioral change attributed to the parasite. We also show that castration post establishment of chronic infection precludes changes in fear and medial amygdala arginine vasopressin in the infected male rats. These observations support the role of gonadal hormones and pursuant neuroendocrine changes in mediating the loss of fear in the infected rats. This work also demonstrates that testosterone acting specifically within the medial amygdala sufficiently explains reduced defensive behaviors often observed during the appetitive component of reproductive behaviors"
Keywords:		androgen behavioral manipulation defensive behaviors parasites pheromones semiochemicals;
Notes:		"PubMed-not-MEDLINESingh, Dhiraj Kumar Hari Dass, Shantala Arundathi Abdulai-Saiku, Samira Vyas, Ajai eng Switzerland 2020/07/28 Front Psychiatry. 2020 Jul 2; 11:630. doi: 10.3389/fpsyt.2020.00630. eCollection 2020"