The deposition and storage of hepatic lipids in the frog Ascaphus truei (Stejneger) : an electron microscopic histochemical and chromatographic study Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/8w32r768j

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  • Electron microscopic, histochemical and thin-layer chromatographic techniques have been used to study some cytological changes associated with seasonal lipid deposition in the liver of Ascaphus. Histochemical and chromatographic information has shown that unsaturated triglycerides occur in great quantities in the liver of pre-ovulatory females and may serve as a solvent for estrogenic compounds as well as for carotenoids. This infiltration of hepatic cells is definitely sexually dimorphic and the livers of males show only a limited seasonal variability. A tri-laminate interface, of about the same dimensions as typical plasma membranes, was observed around the intracellular lipids. This interface suggests that pinocytotic uptake augments the stores produced by intracellular lipogenesis proposed by other authors. The failure to observe colloidal lipid globules, chylomicra, anywhere in the liver suggests a subtle movement of lipids from extra hepatic reserves such as the skeletal muscle and other tissues. Preliminary electron microscopic and chromatographic data indicate a seasonal cessation of bile secretion during the winter fasting period. The sequence of morphological changes characteristic of the post-ovulatory rejuvenation phase further indicate that the rough vesicular endoplasmic reticulum represents a developmental stage in the formation of the compact tubular reticulum of the parenchymal cells.
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