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Divergent effects of unilateral and subtotal nephrectomy on insulin sensitivity in rats
Yoshiyuki Kato1, Yoichi Ohno, Matsuhiko Hayashi
1Department of Internal Medicine, Tokyo Senbai Hospital, Tokyo, Japan.
Objectives:
Insulin resistance is associated with chronic renal failure, which may amplify its cardiovascular pathologic manifestations. We previously showed the presence of insulin resistance in mild renal insufficiency due to chronic glomerulonephritis. These observations may be explained by a decrease in insulin sensitivity due to renal dysfunction. The aim of the present study was to evaluate the effects of unilateral and subtotal nephrectomy on insulin sensitivity.
Methods:
Unilateral heminephrectomy and five-sixths nephrectomy (5/6Nx) were performed in male Sprague-Dawley rats, measuring steady-state plasma glucose (SSPG) during the insulin suppression test.
Results:
The glomerular filtration rate (GFR) decreased significantly from sham-operated rats, to unilateral heminephrectomy group, to 5/6Nx rats. SSPG was unexpectedly lower in the unilateral heminephrectomy group than in controls, suggesting that unilateral heminephrectomy increased the sensitivity to insulin despite a mild decrease in renal function. However, when the analysis was limited to the 5/6Nx group, SSPG was inversely correlated with GFR (r = -0.65, p < 0.05). When renal failure caused by 5/6Nx had reached end stage, the rats became insulin resistant, despite a profound reduction in renal mass.
Conclusion:
It is suggested that unilateral heminephrectomy reduced GFR and increased the sensitivity to insulin. When rats became uremic, insulin sensitivity decreased, even, in 5/6Nx.
Insights
Unilateral heminephrectomy improved insulin sensitivity despite reduced kidney function, but severe renal failure led to insulin resistance. This highlights the complex relationship between kidney mass and metabolic health.
Area of Science:
- Nephrology
- Endocrinology
- Metabolic Research
Background:
- Insulin resistance is linked to chronic renal failure and cardiovascular issues.
- Previous studies indicated insulin resistance in mild renal insufficiency.
- Renal dysfunction may decrease insulin sensitivity.
Purpose of the Study:
- To investigate the impact of unilateral and subtotal nephrectomy on insulin sensitivity in rats.
- To explore the relationship between reduced kidney function and insulin sensitivity.
Main Methods:
- Performed unilateral heminephrectomy and five-sixths nephrectomy (5/6Nx) in male Sprague-Dawley rats.
- Measured steady-state plasma glucose (SSPG) using the insulin suppression test.
- Assessed glomerular filtration rate (GFR).
Main Results:
- GFR significantly decreased with increasing nephrectomy severity.
- Unilateral heminephrectomy unexpectedly increased insulin sensitivity (lower SSPG).
- In the 5/6Nx group, reduced GFR correlated with insulin resistance, especially in end-stage renal failure.
Conclusions:
- Unilateral nephrectomy appears to enhance insulin sensitivity despite mild GFR reduction.
- Progressive renal failure (uremia) leads to decreased insulin sensitivity, even after significant kidney mass reduction.
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