Cytochemical studies of hydrolytic and oxidative enzymes in sections and isolated cells from the endocrine pancreas of guinea-pigs
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Summary
- 1.
Enzyme activity was well preserved in the free islet cells with a more distinct intracellular localization than in the sections. After incubation of the free islet cells for detection of dehydrogenase activity it was still possible after subsequent granule staining, to identify A2 cells.
- 2.
Incubations for acid or alkaline phosphatases gave negative reactions in the islet cells, while incubation for glucose-6-phosphatase showed an intense activity in the islet B cells with the reaction products localized to the nuclear membrane and as irregular aggregations dispersed in the cytoplasm. After incubation for diphosphatases no activity was noted with ADP as substrate, while with IDP and TPP there was a distinct reaction in the Golgi zone of most of the islet cells. There was a positive reaction in the islet cells for ATPase and the cytoplasmic reaction product was mainly localized to mitochondria-like structures.
- 3.
Intense reactions for NADP-diaphorase and α-glycerophosphatate-Menadion reductase were observed in the islets. Most islet cells displayed moderate activity of LDH and SDH while the LDH activity in the A2 cells was somewhat stronger. The intracellular reaction products of all the oxidative enzymes appeared to be accumulated in dot-like structures dispersed in the cytoplasm.
Keywords
Islet Cell Oxidative Enzyme Histochemical Staining Cryostat Section Endocrine PancreasAbbreviations
- ADP
adenosine 5′-diphosphate
- ATP
adenosine 5′-triphosphate
- ATPase
adenosine triphosphatase
- IDP
inosine 5′-diphosphate
- LDH
lactic dehydrogenase
- NAD
nicotinamide-adenine dinucleotide, oxidized form
- NADP
nicotinamideadenine dinucleotide phosphate, oxidized form
- NADPH
nicotinamide-adenine dinucleotide phosphate, reduced form
- Nitro-BT
2,2′-di-p-nitrophenyl-5, 5′-diphenyl-3, 3′-(3,3′-dimetoxy-4, 4′-biphenylene)-ditetrazolium chloride
- PMS
phenazine metosulphate
- SDH
succino dehydrogenase
- TPP
thiamine pyrophosphate chloride
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References
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