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Experimental type 2 diabetes induces enzymatic changes in isolated rat enterocytes
Isabel M Martínez1, Inmaculada Morales, Guadalupe García-Pino
1Departamento de Fisiología, Facultad de Medicina, Universidad de Extremadura, Badajoz, Spain.
Experimental Diabesity Research
|November 25, 2003
Summary
Experimental diabetes in rats alters small intestine enzymes. Diabetic rats showed increased maltase and sucrase activity, suggesting enhanced glucose absorption, while PFK-1 activity decreased.
Area of Science:
- Biochemistry
- Physiology
- Endocrinology
Background:
- Diabetes mellitus is known to induce significant functional and structural alterations in the small intestine in both humans and experimental models.
- Understanding these changes at the enzymatic level is crucial for comprehending glucose metabolism and absorption in diabetic states.
Purpose of the Study:
- To investigate the impact of experimental nonobese type 2 diabetes on the activity of key enzymes in rat enterocytes.
- Specifically, to analyze the activity of intestinal disaccharidases (maltase and sucrase) and 6-phosphofructo-1-kinase (PFK-1) in different diabetic models.
Main Methods:
- Induction of experimental nonobese type 2 diabetes in male Wistar rats using streptozotocin (STZ) at different neonatal ages (day of birth or 5th day of life).
- Isolation of enterocytes from the small intestine of diabetic (n0-STZ, n5-STZ) and nondiabetic (ND) rats.
- Measurement of glycemia, insulinemia, and enzymatic activities of maltase, sucrase, and PFK-1 in isolated enterocytes.
Main Results:
- Diabetic rats exhibited significantly higher glycemia and lower insulinemia compared to nondiabetic controls.
- Activities of sucrase and maltase were significantly elevated in diabetic rats compared to ND rats.
- PFK-1 activity was significantly lower in diabetic rats than in nondiabetic rats, with greater alterations observed in the n0-STZ model.
Conclusions:
- Experimental nonobese type 2 diabetes induces significant enzymatic modifications in rat enterocytes.
- Elevated disaccharidase activity suggests an increased capacity for glucose absorption in the diabetic small intestine.
- The observed enzymatic changes, particularly in PFK-1, highlight metabolic dysregulation in the diabetic gut, potentially favoring glucose absorption.