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Seasonal changes in hepatocyte ultrastructure correlated with the cyclic synthesis of secretory proteins in the winter flounder (Pleuronectes americanus)

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Abstract

Liver tissue was sampled from flounder (Pleuronectes americanus) throughout the year with the intention of documenting changes in the ultrastructure coincident with the production and secretion of antifreeze proteins. In the winter, hepatocytes are dedicated to the production of these proteins and, in the female, also reproductive proteins. In both sexes, liver cells in the summer contain abundant lipid and glycogen stores. In the female, there is a conspicuous hepatocyte transformation from a fat-filled cell in the summer to one with well-developed rough endoplasmic reticulum in the winter. Large amounts of rough endoplasmic reticulum (11.2 mg/gm) were recovered after subcellular fractionation of female wintertime liver. The increased appearance of secretory organelles and the high number of nucleolar profiles observed in winter animals is consistent with the elevated demand for protein secretion and synthesis in both sexes. The fractional volumes occupied by lipid droplets and mitochondria were different when comparisons were made between sex and season. Females contained a greater volume of lipid than did males, and summer animals contained more lipid than those in winter.

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Authors and Affiliations

  1. School of Microbiology and Immunology, The University of New South Wales, Sydney, Australia

    Paul E. March

  2. Division of Natural Sciences, Southampton College of Long Island University, Southampton, N.Y., USA

    Howard M. Reisman

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  1. Paul E. March
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  2. Howard M. Reisman
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March, P.E., Reisman, H.M. Seasonal changes in hepatocyte ultrastructure correlated with the cyclic synthesis of secretory proteins in the winter flounder (Pleuronectes americanus). Cell Tissue Res 281, 153–161 (1995). https://doi.org/10.1007/BF00307969

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  • DOI: https://doi.org/10.1007/BF00307969

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