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Glomerular charge selectivity in type 1 (insulin-dependent) diabetes mellitus
J G Fox1, J D Quin, K R Paterson
1Renal Unit, Royal Infirmary, Glasgow, UK.
Summary
Glomerular charge selectivity, measured by isoamylase clearance ratio, is preserved in early Type 1 diabetes but declines with increasing albuminuria. This indicates impaired kidney filtration in diabetic nephropathy.
Area of Science:
- Nephrology
- Diabetology
- Renal Physiology
Background:
- Type 1 diabetes is a leading cause of chronic kidney disease.
- Diabetic nephropathy is characterized by albuminuria and impaired glomerular filtration.
- Glomerular charge selectivity plays a crucial role in kidney filtration.
Purpose of the Study:
- To assess glomerular charge selectivity in patients with Type 1 diabetes.
- To investigate the relationship between glomerular charge selectivity and albuminuria.
- To determine if impaired charge selectivity is an early marker of diabetic nephropathy.
Main Methods:
- Assessed glomerular charge selectivity using the ratio of pancreatic isoamylase clearance to salivary isoamylase clearance (CPAm/CSAm).
- Studied 12 healthy subjects and 50 Type 1 diabetes patients across different stages of nephropathy (normoalbuminuria, microalbuminuria, clinical nephropathy).
- Analyzed correlation between CPAm/CSAm and albumin excretion rate.
Main Results:
- No significant difference in CPAm/CSAm between normal subjects and normoalbuminuric diabetic patients.
- Significantly lower CPAm/CSAm in diabetic patients with microalbuminuria or clinical nephropathy.
- Significant negative correlation (r = 0.71, p < 0.001) between CPAm/CSAm and albumin excretion rate.
Conclusions:
- Progressive impairment of glomerular charge selectivity accompanies increasing albuminuria in Type 1 diabetes.
- Reduced charge selectivity may be an early indicator of diabetic nephropathy.
- This finding highlights the importance of charge selectivity in diabetic kidney disease progression.