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Urinary copper excretion in type 2 diabetic patients with nephropathy
1Department of Geriatric Medicine, Akita University School of Medicine, Akita, Japan. grtitoh@doc.med.akita-u.ac.jp
Nephron
|July 28, 2001
Summary
Urinary copper excretion increases in advanced diabetic nephropathy due to damaged kidney filtration. This excess copper may contribute to the progression of kidney disease in type 2 diabetes patients.
Area of Science:
- Nephrology
- Endocrinology
- Biochemistry
Background:
- Diabetic nephropathy is a common complication of type 2 diabetes.
- Urinary copper excretion has not been well-studied in relation to diabetic nephropathy stages.
Purpose of the Study:
- To investigate the association between urinary copper excretion levels and the progression of diabetic nephropathy.
- To explore the behavior of copper complexes in diabetic kidney disease.
Main Methods:
- Measured serum and urine copper, ceruloplasmin, and albumin in 41 type 2 diabetic patients and 10 controls.
- Calculated copper/albumin and copper/ceruloplasmin ratios.
- Assessed copper release from ceruloplasmin under varying pH.
Main Results:
- Urinary copper significantly increased only in macroalbuminuric patients.
- Urinary copper/albumin and copper/ceruloplasmin ratios were higher than serum ratios.
- These urinary ratios decreased with nephropathy progression.
- Copper dissociated from ceruloplasmin under acidic conditions.
Conclusions:
- In advanced diabetic nephropathy, increased urinary copper likely stems from damaged glomeruli releasing copper-albumin and ceruloplasmin-copper complexes.
- Elevated urinary copper may contribute to renal tubule damage and nephropathy progression.
- Understanding copper's role could inform future therapeutic strategies.