Abstract
In this paper we investigate by means of immunohistochemistry, the tissue distribution of constitutive cytochrome P4501A (CYP1A), from hatching until 30 days posthatching in developing Siberian sturgeon, Acipenser baeri. For this purpose, a polyclonal (BN-1) antiserum developed against a conservative sequence of piscine CYP1A and a monoclonal (C10-7) antiserum directed against cod CYP1A were used on paraffin-embedded samples. From hatching onwards, distinct CYP1A immunoreactivity was distinctly observed in the following tissues and cells: envelope of oil droplets, matrix and syncytium of the yolk-sac, sinusoids, biliary epithelial cells and hepatocytes. In the digestive tract, buccopharyngeal, oesophageal, gastric and intestinal epithelia, as well as the cytoplasm and brush border of enterocytes were CYP1A-positive. Interestingly, gastric glands and melanin-plug present within lumen of the digestive system were strongly immunoreactive. Kidney (epithelia of renal tubules), gills (pillar and endothelial cells), skin (epithelial cells), muscle fibres of heart and eye (retina) were positive. In brain, we observed a strong CYP1A staining in the developing telencephalon and especially in olfactory system, as well as in those nerve fibres running ventrally toward the posterior brain. A strong CYP1A staining was observed in vascular endothelia of all organs/tissues, especially in the liver. In general, the intensity of CYP1A immunostaining increased during larval development, suggesting besides its known metabolic function (endogenous and/or exogenous), a possible participation of this heme-protein in control of cell division, regulation of growth and differentiation.
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Sarasquete, C., Ortiz, J.B. & Gisbert, E. Immunohistochemical Distribution of Cytochrome P4501A in Larvae and Fingerlings of the Siberian Sturgeon, Acipenser baeri. Histochem J 33, 101–110 (2001). https://doi.org/10.1023/A:1017900314779
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DOI: https://doi.org/10.1023/A:1017900314779