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Effect of Mn++ on blood sugar level in rats
Abstract:
Mn++ produced hypoglycemia in normal rats. The effect was dose-dependent. However, Mn++ did not produce hypoglycemia in alloxan-treated rats. There was a rise in liver glycogen following Mn++ treatment which was correlated with fall in blood sugar at 1 1/2 and 3 hr. There was also increase in the glucose uptake by rat diaphragm upto 47% between 2 and 3 hr. The results suggest that functioning, intact pancreatic beta-cells are necessary for the action of Mn++ and that Mn++ may have a peripheral effect on glucose entry into the cells.
Insights
Manganese (Mn++) lowers blood sugar in normal rats in a dose-dependent manner. This effect requires intact pancreatic beta-cells and may involve increased glucose uptake by peripheral tissues.
Area of Science:
- Biochemistry
- Endocrinology
- Pharmacology
Background:
- Manganese (Mn++) is an essential trace element with various biological roles.
- The precise mechanisms by which Mn++ influences glucose metabolism are not fully understood.
Purpose of the Study:
- To investigate the effect of manganese (Mn++) on blood glucose levels in rats.
- To determine the role of pancreatic beta-cells and peripheral tissues in Mn++-induced hypoglycemia.
Main Methods:
- Administered varying doses of Mn++ to normal and alloxan-treated rats.
- Measured blood glucose and liver glycogen levels at different time points.
- Assessed glucose uptake by isolated rat diaphragm in vitro.
Main Results:
- Mn++ significantly reduced blood glucose in a dose-dependent manner in normal rats.
- Alloxan-induced diabetes abolished the hypoglycemic effect of Mn++.
- Mn++ treatment led to increased liver glycogen and enhanced glucose uptake by rat diaphragm.
Conclusions:
- Functioning pancreatic beta-cells are essential for Mn++ to induce hypoglycemia.
- Mn++ may exert a peripheral effect, promoting glucose entry into cells.
- These findings shed light on the complex interplay between manganese and glucose homeostasis.