Gastric cancer containing insulin and associated with hypoglycemia

A patient with gastric cancer associated with hypoglycemia is described. Immunoassay of acid alcohol tissue extract revealed the presence of 7.6 mU. insulin per gram wet tissue weight in the primary tumor which weighed 10 gm. No insulin was detected in the hepatic metastasis. The concentration of pancreatic insulin was decreased and the serum insulin level was not elevated. Tissue insulinase activity was virtually absent in the primary tumor, whereas the hepatic metastasis showed activity comparable to that of normal liver. It is difficult to assume, however, that the release of insulin from the primary tumor, which contained such small quantities of the hormone, could be the Bole cause of hypoglycemia. An additional mechanism(s) must have been involved in the causation of hypoglycemia in this patient.

Glycogen content of mouse hemidiaphragm as a biologic indicator of insulin action

The mouse hemidiaphragm insulin assay utilizes glycogen content as the biologic indicator of insulin activity. It is statistically valid and has a mean index of precision of 0.22. The effects of alterations in the incubation medium showed that hyperosmolarity, hypo-osmolarity, and inadequate oxygenation reduced the glycogen content. There was a linear increase in glycogen content when it was plotted against the log of glucose concentration from 3 to 20 mg/ml. At these glucose concentrations, maximal insulin stimulation increased glycogen content 50–100%. Optimal pH was 7.34–7.53 and optimal incubation time was 90 min. Insulin activity of native serum (NSIA) was low in peripheral vein and much higher in pancreatic vein. Insulin activity in acid alcoholic treated dialyzed serum (TSIA) was much higher than NSIA in peripheral vein and significantly higher in pancreatic vein. NSIA was neutralizable; the additional activity made manifest by treatment was not. The effect of NSIA, TSIA, and standard insulin decreased in parallel manner with dilution.

An examination of adrenergic axons around pancreatic arterioles of the cat for the presence of acetylcholinesterase by high resolution autoradiographic and histochemical methods

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Pancreatic acinar cell regeneration. II. Enzymatic, nucleic acid, and protein changes

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Pancreatic acinar cell regeneration

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The effects of iron-dextran on squirrel monkeys (Saimiri sciurea)

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