Summary
Differential induction of serine: pyruvate aminotransferase (SPT) in rat liver parenchymal cells by administration of glucagon or di-(2-ethylhexyl)phthalate (DEHP) was studied using post-embedding immunocytochemical techniques and morphometric methods. Two groups of rats were fasted for 5 days and daily received peritoneal injection of glucagon (300 μg/100 g) or physiological saline. Another two groups of rats were fed on laboratory chow with or without 2% DEHP for 2 weeks. Livers were perfusionfixed, cut into tissue sections (50–100 μ), and processed to cytochemistry for catalase, immunocytochemistry for SPT, and conventional procedures for electron microscopy. The morphometric analysis showed that glucagon injection has negligible effect on the volume and numerical density and mean diameter of peroxisomes, whereas volume density of mitochondria was decreased by 25%. By DEHP administration peroxisomes were about 3-fold increased in the volume and numerical density. Mitochondria was increased about 40% in the numerical density, but unchanged in the volume density. Light and electron microscopic immunocytochemistry demonstrated that glucagon injection exclusively enhanced mitochondrial SPT, whereas DEHP administration exclusively induced in peroxisomal SPT. Quantitative analysis showed that by the glucagon injection, the labeling density of mitochondria was increased about 4-fold, but that of peroxisomes was 1.6 times as much as control, while by DEHP administration, the labeling density of peroxisomes was enhanced about 3-fold but that of mitochondria was decreased by 13%. The results clearly indicate that glucagon induces mitochondrial SPT, whereas peroxisome proliferator, DEHP induces peroxisomal SPT.
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Yokota, S. Quantitative immunocytochemical studies on differential induction of serine. Histochemistry 85, 145–155 (1986). https://doi.org/10.1007/BF00491762
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DOI: https://doi.org/10.1007/BF00491762