ACTH modulation on corticosterone, melatonin, testosterone and innate immune response in the tree frog Hypsiboas faber

Autor(es)

Giorgi Barsotti, Adriana Maria ; de Assis, Vania Regina ; Monteiro Titon, Stefanny Christie ; Titon Junior, Braz ; da Silva Ferreira, Zulma Felisbina ; Gomes, Fernando Ribeiro

• Tipo de documento: Artigo Científico
• Fonte: COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY; v. 204, p. 177-184, FEB 2017.
• Citações Web of Science: 6

Resumo

The modulation exerted by glucocorticoids in physiological responses to stressors is essential for maintaining short-term homeostasis. However, highly frequent and/or prolonged activation of the hypothalamic-pituitary-adrenal/interrenal axis may inhibit processes that are important to long-term fitness and health, including reproduction and immunocompetence. The present study evaluates the response to adrenocorticotropic hormone (ACTH) injection in the adult male tree frog, Hypsiboas faber, as indicated by levels of plasma corticosterone (CORT), plasma testosterone (T), ocular melatonin (MEL), hematocrit and immune functioning (total leukocyte count and bacterial killing ability against Escherichia coli). All levels were measured 1, 3 and 6 h after treatment. ACTH increased CORT levels whilst decreasing T and MEL levels at 1 h post-treatment. 6 h after ACTH injection, hematocrit and MEL levels increased. ACTH treatment did not significantly modulate the immune measures over the time-range sampled. The hormonal changes observed in response to ACTH treatment suggest that stressors could act as inhibitors of reproductive activity, as well as differentially modulating melatonin levels at different time-points. (C) 2016 Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 11/10560-8 - Níveis plasmáticos de corticosterona, testosterona e imunocompetência em Bufonídeos.
• Beneficiário: Vania Regina de Assis
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 06/54699-1 - Fragmentação das florestas, distribuição geográfica e evolução fisiológica em anuros neotropicais
• Beneficiário: Fernando Ribeiro Gomes
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 13/00900-1 - Estudo comparativo das relações entre imunocompetência e níveis plasmáticos de esteróides inter-renais e gonadais em sapos
• Beneficiário: Fernando Ribeiro Gomes
• Modalidade de apoio: Auxílio à Pesquisa - Regular