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In this paper, we examined how the oxidative status (antioxidant system and oxidative damage) of larvae changed during the metamorphic climax (Gosner stages: 42-beginning, 44-middle and 46-end) and compared the patterns and levels of oxidative stress parameters between individuals developing under constant water availability (control) and those developing under decreasing water availability (desiccation group). Our results revealed that larvae developing under decreasing water availability exhibited increased oxidative damage in the middle and end stages. This was followed by lower levels of glutathione in stages 44 and 46, as well as lower values of catalase, glutathione peroxidase, glutathione S-transferase and sulfhydryl groups in stage 46 (all in relation to control animals). Comparison between stages 42, 44 and 46 within treatments showed that individuals in the last stage demonstrated the highest intensities of lipid oxidative damage in both the control and desiccation groups. As for the parameters of the antioxidant system, control individuals displayed greater variety in response to changes induced by metamorphic climax than individuals exposed to desiccation treatment. The overall decrease in water availability during development led to increased oxidative stress and modifications in the pattern of AOS response to changes induced by metamorphic climax in larvae of .
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http://dx.doi.org/10.3390/ani11040953 | DOI Listing |
Zoolog Sci
August 2025
Amphibian Research Center, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan,
To elucidate the control mechanism of tail resorption during metamorphosis, the expression of , a macrophage-apoptotic cell bridging molecule that promotes phagocytosis in mammals, was examined. In both and , the expression in the tail increased significantly during metamorphosis, reaching its peak at the metamorphic climax, when the tail shortens rapidly. This finding suggests that the up-regulation of at metamorphic climax is involved in the clearance of apoptotic tail muscles.
View Article and Find Full Text PDFJ Exp Zool A Ecol Integr Physiol
September 2025
Department of Forestry and Natural Resources, Purdue University, West Lafayette, Indiana, USA.
Peroxisome proliferator-activated receptors (PPAR) are master transcriptional regulators that maintain metabolic homeostasis in vertebrates. Amphibians are often exposed to endocrine disrupting compounds (EDCs) that could dysregulate lipid metabolism. Larvae of the African clawed frog (Xenopus laevis) are routinely used as a model to study aquatic EDC exposures, but PPAR expression has not been characterized across larval development or metamorphosis in this species.
View Article and Find Full Text PDFEnviron Pollut
July 2025
University of South Bohemia in České Budějovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, Zátiší 728/II, 389 25, Vodňany, Czech Republic.
Though bioconcentration of ionizable pharmaceuticals has received increased attention in fish and invertebrates, an understanding of bioconcentration of these contaminants of emerging concern by amphibians is lacking. Here, we investigated the bioconcentration, elimination and metabolism of a model weak base, the antihistamine diphenhydramine (DPH), at different developmental stages in the African clawed frog (Xenopus laevis), a well-established amphibian model. These developmental stages of X.
View Article and Find Full Text PDFGen Comp Endocrinol
June 2025
Comparative Endocrinology and Integrative Biology, Centre of Marine Sciences, Universidade do Algarve, Campus de Gambelas, Faro, Portugal; International Research Center for Marine Biosciences, Ministry of Science and Technology, Shanghai Ocean University, Shanghai, China. Electronic address: dpower@
The thyroid hormones (THs) are proposed as putative regulators of immune system maturation in developing teleost fish. To gain insight into this process the Senegalese sole (Solea senegalensis) that has a well-characterized TH-driven metamorphosis was used. Differential gene expression analysis was performed across developmental stages (n = 3 per stage): pre-metamorphosis, onset of metamorphosis, metamorphosis, early climax, climax, and post-metamorphic juveniles.
View Article and Find Full Text PDFImmunol Res
January 2025
School of Environment and Science, Griffith University, Southport, QLD, 4222, Australia.
The fungal disease chytridiomycosis (caused by Batrachochytrium dendrobatidis [Bd]) is a primary contributor to amphibian declines. The frog metamorphic stages, characterised by extensive physiological reorganisation and energy expenditure, have heightened susceptibility to Bd. However, little is known about how these metamorphic stages respond immunologically to Bd infection.
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