Abstract
In the present study, acute stress responses of adult female Notopterus chitala were scrutinized by antioxidant status and inflammation reaction in the gill and liver at five different salinity exposures (0, 3, 6, 9, 12 ppt). Oxidative defense was assessed by determining superoxide dismutase (SOD), catalase (CAT), glutathione S-transferase, and glutathione reductase activities, while malondialdehyde (MDA), glutathione, and xanthine oxidase levels were determined as indicators of oxidative load. Pro-inflammatory cytokines (IL-1β, IL-6, IL-10, and TNFα) and caspase 1 levels were also analyzed. Expression levels of transcription factors (NRF2 and NF-κB) and molecular chaperons (HSF, HSP70, and HSP90) were estimated to evaluate their relative contribution to overcome salinity stress. MDA showed a significant (P < 0.05) increase (gill, + 25.35–90.14%; liver, + 23.88–80.59%) with salinity; SOD (+ 13.72–45.09%) and CAT (+ 12.73–33.96%) exhibited a sharp increase until 9 ppt, followed by a decrease at the highest salinity (12 ppt) (gill, − 3.92%; liver, − 2.18%). Levels of cytokines were observed to increase (+ 52.8–127.42%) in a parallel pattern with increased salinity. HSP70 and HSP90 expressions were higher in gill tissues than those in liver tissues. NRF2 played pivotal role in reducing salinity-induced oxidative load in both the liver and gills. Serum cortisol and carbonic anhydrase were measured and noted to be significantly (P < 0.05) upregulated in salinity stressed groups. Gill Na+-K+-ATPase activity decreased significantly (P < 0.05) in fish exposed to 6, 9, and 12 ppt compared to control. Present study suggests that a hyperosmotic environment induces acute oxidative stress and inflammation, which in turn causes cellular death and impairs tissue functions in freshwater fish species such as Notopterus chitala.
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The datasets generated and/or analyzed during the current study are not publicly available but are available from the corresponding author on reasonable request.
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Moniruzzaman, M., Mukherjee, M., Kumar, S. et al. Effects of salinity stress on antioxidant status and inflammatory responses in females of a “Near Threatened” economically important fish species Notopterus chitala: a mechanistic approach. Environ Sci Pollut Res 29, 75031–75042 (2022). https://doi.org/10.1007/s11356-022-21142-9
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DOI: https://doi.org/10.1007/s11356-022-21142-9