期刊
CANADIAN JOURNAL OF ZOOLOGY
卷 96, 期 12, 页码 1336-1345出版社
CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS
DOI: 10.1139/cjz-2018-0012
关键词
Amphibia; LPS infection; spermatogenesis; Bidderian oogenesis; melanomacrophages; Rhinella diptycha; Cururu toad
类别
资金
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2011/21519-9, 2013/16948-3, 2014/00946-4, 2013/02067-5]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [305081/2015-2]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
Anurans can be naturally infected by the bacterium Escherichia coli (Migula, 1895) Castellani and Chalmers, 1919, which contain lipopolysaccharides (LPS) in their external membrane. LPS affects reproductive functions in mammals and extracutaneous pigmentary system of anurans. Besides the functional gonad, bufonid amphibians have an undeveloped female organ (Bidder's organ), whose function is poorly known. We aimed to investigate the effects of LPS on testis and Bidder's organ germ cells and on liver pigmentation in the toad Rhinella diptycha (Cope, 1862). Animals were inoculated with 0.1 mL of saline solution (control) or LPS solution (18 mg/kg) and then euthanized after 24 or 48 h. The organs were processed for histology and then evaluated with morphometric analysis. The LPS decreased the area of bundle spermatozoa and increased lumen spermatozoa, while in Bidder's organ, the number of degenerating oocytes decreased. Liver melanin increased after 24 h and decreased after 48 h. Our results suggest that LPS delays the release of spermatozoa, possibly due to alterations in serum levels of testosterone and (or) gonadotropins, which may also explain fewer degrading cells in Bidder's organ. Increased melanin in the liver was expected due to the bactericidal role of this pigment. Thus, LPS affected reproductive organs and induced cytoprotective responses in the liver of amphibians.
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