期刊
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY C-TOXICOLOGY & PHARMACOLOGY
卷 271, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cbpc.2023.109700
关键词
Hair cell; Ionocyte; Lateral line; Mercury; Methylmercury; Toxicity; Zebrafish
Methylmercury affects the nervous system of fish, causing various changes in behavior and physiology. This study used zebrafish embryos as a model and found that exposure to different concentrations of MeHg resulted in decreased survival rate, delayed hatching, and impaired sensory and ion-regulatory functions in fish.
Methylmercury can interfere with the normal functioning of the nervous system, causing a variety of behavioral and physiological changes in fish. However, the influence of MeHg on the lateral line sensory and ion-regulatory functions of fish is not clear. Zebrafish embryos were utilized as a model to address this question. After exposure to water-borne MeHg (5, 10, 50, or 100 ppb) for 96 h (4-100 h post-fertilization), the survival rate declined by ca. 50 % at 100 ppb. However, MeHg at sublethal concentrations delayed hatching and decreased heart rates and body length. As to effects on the lateral line sensory system, MeHg at & GE;10 ppb decreased the number of hair cells and impaired hair bundles and Ca2+-mediated mechanical transduction. As to ion regulation, MeHg at & GE;10 ppb decreased the densities of skin stem cells and ionocytes, leading to declines in ion (Na+, K+, and Ca2+) contents and H+/NH4+ excretion levels. A gene expression analysis also revealed declines in messenger RNA levels of several ion-regulatory genes (ncc2b, trpv6v1a, trpv5/6, ncx1b, and rhcg1). This study demonstrated that the lateral line sensory and ion regulatory functions of fish are extremely sensitive to MeHg.
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