PUBLICATION
Tributyltin impaired spermatogenesis and reproductive behavior in male zebrafish
- Authors
- Lan, X.R., Li, Y.W., Chen, Q.L., Shen, Y.J., Liu, Z.H.
- ID
- ZDB-PUB-200522-13
- Date
- 2020
- Source
- Aquatic toxicology (Amsterdam, Netherlands) 224: 105503 (Journal)
- Registered Authors
- Keywords
- Gene expression, Reproductive behavior, Spermatogenesis, Tributyltin, Zebrafish
- MeSH Terms
-
- Animals
- Apoptosis/drug effects
- Apoptosis/genetics
- Female
- Gene Expression/drug effects
- Male
- Meiosis/drug effects
- Meiosis/genetics
- Receptors, Tumor Necrosis Factor, Type I/genetics
- Reproduction/drug effects
- Sexual Behavior, Animal/drug effects*
- Spermatogenesis/drug effects*
- Spermatozoa/drug effects
- Spermatozoa/metabolism
- Testis/drug effects
- Testis/metabolism
- Trialkyltin Compounds/toxicity*
- Water Pollutants, Chemical/toxicity*
- Zebrafish/physiology*
- PubMed
- 32438217 Full text @ Aquat. Toxicol.
Citation
Lan, X.R., Li, Y.W., Chen, Q.L., Shen, Y.J., Liu, Z.H. (2020) Tributyltin impaired spermatogenesis and reproductive behavior in male zebrafish. Aquatic toxicology (Amsterdam, Netherlands). 224:105503.
Abstract
Tributyltin (TBT) was reported to affect sexual behavior and gametogenesis in fish. However, the modes of action involved are largely unclear. In order to elucidate the toxicological mechanisms of TBT in reproduction, zebrafish (Danio rerio) males were exposed to TBT at concentrations of 100 and 500 ng/L for 28 days. After exposure, the sperm count of the treated fish was sharply decreased though the testis weight and gonadosomatic index remained unchanged. Moreover, reduced number of spermatogonia and spermatozoa and increased spermatocytes were observed in TBT-treated fish by histological observation and PCNA-immunostaining. Increased number of apoptotic-positive spermatocytes was also present in TBT-treated fish, indicating an enhanced apoptosis in these cells. Consistent to decreased number of spermatogonia, down-regulated expressions of genes responsible for germ cell proliferation (cyclind1 and pcna) were observed in TBT-treated fish. In contrast, TBT elevated the expressions of genes involved in meiotic entry and maintenance (aldhla2, sycp3 and dmc1) while suppressed the mRNA level of gene responsible for terminus of meiotic entry (cyp26a1), in agreement with arrested meiosis and reduced sperm count. Furthermore, TBT significantly elevated the ratios of bax/bcl-2 and tnfrsf1a/tnfrsf1b in testis, which are markers for intrinsic- and extrinsic-apoptotic pathways, consistent with the enhanced TUNEL positive signals in spermatocytes. Moreover, TBT also significantly affected the parameter of reproductive behaviors in treated fish (reflected by decreased frequency of meeting, visits and time spent in spawning area). Consistently, the expressions of genes responsible for the modulation of reproductive behaviors in brain (such as cyp19a1b, kiss2, gnrh3 and ompb) were significantly down-regulated in treated-fish. Interestingly, disrupted reproductive behaviors of untreated female fish were also observed in the present study. The present study indicated that TBT might affect the reproduction of zebrafish male by disrupting the spermatogenesis and reproductive behavior of the fish.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping