Abstract
Peroxisome proliferator-activated receptors (PPARs) are members of the superfamily of nuclear hormone receptors involved in embryo development and differentiation of several tissues in mammals. The aim of the present study was to investigate the possible differential expression of the three PPAR subtypes (PPARα, PPARβ, and PPARγ) in relation to gender and developmental stage in zebrafish. For this purpose PPAR expression was assessed by immunohistochemistry in 7-day-old larvae, 1-month-old juveniles, and 1-year-old adults. Additionally, the activity of peroxisomal acyl-CoA oxidase (AOX), a gene regulated by PPARs, and the volume density of catalase-immunolabeled liver peroxisomes (VVP) was examined. No significant gender-related differences were detected in the tissue distribution of the three PPAR subtypes or in peroxisomal AOX activity and VVP. The percentage of PPARβ-positive hepatocytes was significantly higher in females than in males suggesting a specific regulatory role of this subtype in female zebrafish. The three PPAR subtypes were already expressed at the larval stage, with a similar tissue distribution pattern to that found in adults. For all stages, PPARα and PPARγ were expressed at higher levels than PPARβ, and PPARβ immunolabeling was stronger in juveniles than in larval or adult stages. The percentages of hepatocyte nuclei immunolabeled for PPARs was higher in early developmental stages than in adults, similarly to AOX activity and VVP. In conclusion, our results indicate that PPAR expression, the activity of its target gene AOX, and peroxisomal biogenesis are developmentally modulated in zebrafish.
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Acknowledgements
This study has been funded by the University of the Basque Country through a grant to consolidated research groups, by the Spanish Ministry of Science and Technology through project AMB99-0324 (CICYT), by the Spanish Ministry of Education and Culture through a predoctoral fellowship to Arantza lbabe, and by the European Commission (Research Directorate General, Environment Programme-Marine Ecosystems) through the BEEP project “Biological Effects of Environmental Pollution in Marine Coastal Ecosystems” (contract EVK3-CT2000-00025). The BEEP project is part of the EC IMPACTS cluster. We are indebted to Prof. H.D. Fahimi (University of Heidelberg, Germany) for the kind gift of the rabbit anti-guinea pig liver catalase antibody and for support during this study.
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Ibabe, A., Bilbao, E. & Cajaraville, M.P. Expression of peroxisome proliferator-activated receptors in zebrafish (Danio rerio) depending on gender and developmental stage. Histochem Cell Biol 123, 75–87 (2005). https://doi.org/10.1007/s00418-004-0737-2
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DOI: https://doi.org/10.1007/s00418-004-0737-2