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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Captivity effects on immune response and steroid plasma levels of a Brazilian toad (Rhinella schneideri)

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Author(s):
Monteiro Titon, Stefanny Christie [1] ; Assis, Vania Regina [1] ; Titon Junior, Braz [1] ; Cassettari, Bruna de Oliveira [1] ; Carlos Magno Fernandes, Pedro Augusto [1] ; Gomes, Fernando Ribeiro [1]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Inst Biociencias, Dept Fisiol, Lab Comportamento & Fisiol Evolut, Rua Matao Tr 14 101 Lab 300, BR-05508900 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: JOURNAL OF EXPERIMENTAL ZOOLOGY PART A-ECOLOGICAL AND INTEGRATIVE PHYSIOLOGY; v. 327, n. 2-3, p. 127-138, FEB-MAR 2017.
Web of Science Citations: 9
Abstract

Stressors can increase plasma glucocorticoid (GC) levels and decrease plasma androgen levels in different species of vertebrates. GCs can have immune-enhancing or immunosuppressive effects, which are dependent upon stress duration and intensity. The worldwide decline in amphibian populations is strongly linked to an array of different stressors. The impacts of stress on GCs, androgens, and the immune response are important to clarify and should lead to the better development of conservation strategies. The present study in adult male toads of Rhinella schneideri investigated the effects of captivity (7, 30, and 60 days) on plasma corticosterone (CORT) and plasma testosterone (T), as well as innate immune responses, specifically humoral and cell mediated responses, as indicated by bacterial killing ability (BKA) and phagocytosis by peritoneal cells, respectively. Captivity increased CORT threefold and decreased T versus controls. CORT maintained a threefold elevation throughout the captivity period, while body mass and T gradually decreased with time in captivity. BKA was lower at day 30, versus days 7 and 60, while peritoneal cell phagocytic efficiency decreased after day 30, remaining low at day 60. Moreover, phagocytosis efficiency was positively associated with T and body condition, suggesting that the effects of chronic stress on reproductive potential and immune response might be associated with the state of energetic reserves. (AU)

FAPESP's process: 13/00900-1 - Comparative study of the relationships between immunocompetence and plasmatic levels of gonadal and inter-renal steroids in toads
Grantee:Fernando Ribeiro Gomes
Support type: Regular Research Grants