Abstract:Arsenic is a contaminant found worldwide in drinking water and food. Epidemiological studies have correlated arsenic exposure with reduced weight gain and improper muscular development, while in vitro studies show that arsenic exposure impairs myogenic differentiation. The purpose of this study was to use Fundulus heteroclitus or killifish as a model organism to determine if embryonic-only arsenic exposure permanently reduces the number or function of muscle satellite cells. Killifish embryos were exposed to 0… Show more
“…The high expression of the MyoD gene may be involved in the regulation of the normal structure and motor function of the tail handle muscle. Desmin is an intermediate lament protein closely related to muscle tissue development and structural stability (Szymkowicz et al, 2018). The high expression of Desmin in zebra sh myocardium, dorsal muscle, and tail handle muscle may be involved in the tissue structure.…”
Exercise can have beneficial effects on fish. However, there is few studies on the expression profile analysis of muscle growth regulation genes and impact of water flow stress on expression levels of the muscle genes in fish. In this study, myogenic regulatory genes (MyoD), myostatin-regulated genes (Mstnb), myoblast development-related genes (Desmin and MYHC) were displayed high expression in muscle tissues of adult zebrafish. MyoD, MyoG, MRF4 and MYHC are higher expression at the muscle effect stage embryos. And we explore that the 30 days old is critical muscle growth period in zebrafish. Furthermore, water flow stress can enhance the expression levels of myogenic regulatory factors (eg. MyoD, MyoG) and myoblast development-related genes (Pax7, Desmin) in the zebrafish trunk dorsal muscle, while the mRNA levels of myostatin regulatory genes, such as Mstna and Mstnb, are significantly down-regulated. Our results suggest that appropriate water flow stressing for 1–2 weeks could promote zebrafish muscle growth, while zebrafish may be in motor fatigue after four weeks of water flow stress. This research provides a foundation for further exploration of fish exercise physiology and adaptation, and is significant for fish farming and conservation.
“…The high expression of the MyoD gene may be involved in the regulation of the normal structure and motor function of the tail handle muscle. Desmin is an intermediate lament protein closely related to muscle tissue development and structural stability (Szymkowicz et al, 2018). The high expression of Desmin in zebra sh myocardium, dorsal muscle, and tail handle muscle may be involved in the tissue structure.…”
Exercise can have beneficial effects on fish. However, there is few studies on the expression profile analysis of muscle growth regulation genes and impact of water flow stress on expression levels of the muscle genes in fish. In this study, myogenic regulatory genes (MyoD), myostatin-regulated genes (Mstnb), myoblast development-related genes (Desmin and MYHC) were displayed high expression in muscle tissues of adult zebrafish. MyoD, MyoG, MRF4 and MYHC are higher expression at the muscle effect stage embryos. And we explore that the 30 days old is critical muscle growth period in zebrafish. Furthermore, water flow stress can enhance the expression levels of myogenic regulatory factors (eg. MyoD, MyoG) and myoblast development-related genes (Pax7, Desmin) in the zebrafish trunk dorsal muscle, while the mRNA levels of myostatin regulatory genes, such as Mstna and Mstnb, are significantly down-regulated. Our results suggest that appropriate water flow stressing for 1–2 weeks could promote zebrafish muscle growth, while zebrafish may be in motor fatigue after four weeks of water flow stress. This research provides a foundation for further exploration of fish exercise physiology and adaptation, and is significant for fish farming and conservation.
“…Studies have demonstrated that arsenic exposure induced skeletal muscle injury via generating more reactive oxygen species as well as restraining mitophagy and mitochondrial function in mice and duck 10–12 . Moreover, in vivo studies, arsenic exposure reduced the function of muscle satellite cells and thus impaired myogenic differentiation, which maybe mediated by NF‐κB 13,14 . In vitro studies have also confirmed that inorganic arsenic induced cytotoxicity to skeletal muscle cells by inhibiting myogenic differentiation and muscle regeneration and inducing C 2 C 12 myotube atrophy 15 .…”
Section: Introductionmentioning
confidence: 96%
“…[10][11][12] Moreover, in vivo studies, arsenic exposure reduced the function of muscle satellite cells and thus impaired myogenic differentiation, which maybe mediated by NF-κB. 13,14 In vitro studies have also confirmed that inorganic arsenic induced cytotoxicity to skeletal muscle cells by inhibiting myogenic differentiation and muscle regeneration and inducing C 2 C 12 myotube atrophy. 15 However, the mechanism of skeletal muscle metabolic dysfunction in arsenic-induced skeletal muscle atrophy remains largely unknown.…”
Arsenic is a well‐known environmental toxicant and emerging evidence suggests that arsenic exposure has potential skeletal muscle toxicity; however, the underlying mechanism has not yet been clarified. The aim of this study was to investigate the correlation among adverse effects of subchronic and chronic environmental arsenic exposure on skeletal muscle as well as specific myokines secretion and angiotensin II (AngII)–melatonin (MT) axis in rats. Four‐week‐old rats were exposed to arsenite (iAs) in drinking water at environmental relevant concentration of 10 ppm for 3 or 9 months. Results indicated that the gastrocnemius muscle had atrophied and its mass was decreased in rats exposed to arsenite for 9 months, whereas, they had no significant changes in rats exposed to arsenite for 3 months. The levels of serum‐specific myokine irisin and gastrocnemius muscle insulin‐like growth factor‐1 (IGF‐1) were increased in 3‐month exposure group and decreased in 9‐month exposure group, while serum myostatin (MSTN) was increased significantly in 9‐month exposure group. In addition, serum AngII level increased both in 3‐ and 9‐month exposure groups, while serum MT level increased in 3‐month exposure group and decreased in 9‐month exposure group. Importantly, the ratio of AngII to MT level in serum increased gradually with the prolongation of arsenite exposure. It showed a certain correlation between AngII–MT axis and gastrocnemius muscle mass, gastrocnemius muscle level of IGF‐1 or serum levels of irisin and MSTN. In conclusion, the disruption of AngII–MT axis balance may be a significant factor for skeletal muscle atrophy induced by chronic environmental arsenic exposure.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.