Stage-dependent localization of F-actin and Na + /K + -ATPase in zebrafish embryos detected using optimized cryosectioning immunostaining protocol.

Autor: Karaica D; Molecular Toxicology Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia., Mihaljević I; Laboratory for Molecular Ecotoxicology, Ruđer Bošković Institute, Zagreb, Croatia., Vujica L; Laboratory for Molecular Ecotoxicology, Ruđer Bošković Institute, Zagreb, Croatia., Bošnjak A; Department of Biology, Faculty of Science, University of Zagreb, Zagreb, Croatia., Dragojević J; Laboratory for Molecular Ecotoxicology, Ruđer Bošković Institute, Zagreb, Croatia., Otten C; Laboratory for Molecular Ecotoxicology, Ruđer Bošković Institute, Zagreb, Croatia., Babić N; Department of Biology, Faculty of Science, University of Zagreb, Zagreb, Croatia., Lončar J; Laboratory for Molecular Ecotoxicology, Ruđer Bošković Institute, Zagreb, Croatia., Smital T; Laboratory for Molecular Ecotoxicology, Ruđer Bošković Institute, Zagreb, Croatia.
Jazyk: angličtina
Zdroj: Microscopy research and technique [Microsc Res Tech] 2023 Mar; Vol. 86 (3), pp. 294-310. Date of Electronic Publication: 2022 Dec 01.
DOI: 10.1002/jemt.24270
Abstrakt: The increasing use of the zebrafish model in biomedical and (eco)toxicological studies aimed at understanding the function of various proteins highlight the importance of optimizing existing methods to study gene and protein expression and localization in this model. In this context, zebrafish cryosections are still underutilized compared with whole-mount preparations. In this study, we used zebrafish embryos (24-120 hpf) to determine key factors for the preparation of high-quality zebrafish cryosections and to determine the optimal protocol for (immuno)fluorescence analyses of Na + /K + -ATPase and F-actin, across developmental stages from 1 to 5 dpf. The results showed that the highest quality zebrafish cryosections were obtained after the samples were fixed in 4% paraformaldehyde (PFA) for 1 h, incubated in 2.5% bovine gelatin/25% sucrose mixture, embedded in OCT, and then sectioned to 8 μm thickness at -20°C. Fluorescence microscopy analysis of phalloidin-labeled zebrafish skeletal muscle revealed that 1-h-4% PFA-fixed samples allowed optimal binding of phalloidin to F-actin. Further immunofluorescence analyses revealed detailed localization of F-actin and Na + /K + -ATPase in various tissues of the zebrafish and a stage-dependent increase in their respective expression in the somitic muscles and pronephros. Finally, staining of zebrafish cryosections and whole-mount samples revealed organ-specific and zone-dependent localizations of the Na + /K + -ATPase α1-subunit. RESEARCH HIGHLIGHTS: This study brings optimization of existing protocols for preparation and use of zebrafish embryos cryosections in (immuno)histological analyses. It reveals stage-dependent localization/expression of F-actin and Na + /K + -ATPase in zebrafish embryos.
(© 2022 Wiley Periodicals LLC.)
Databáze: MEDLINE
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