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[Physiological effects of the connecting peptide]
1Service de pédiatrie multidisciplinaire, hôpital d'Enfants de la Timone, 13385 Marseille cedex 05, France. michel.tsimaratos@ap-hm.fr
Summary
C-peptide, once thought inert, improves kidney function in insulin-dependent diabetes mellitus (IDDM) by boosting Na,K-ATPase activity. This suggests C-peptide therapy could benefit IDDM patients with renal complications.
Area of Science:
- Biochemistry
- Endocrinology
- Nephrology
Context:
- Insulin-dependent diabetes mellitus (IDDM) is linked to altered kidney function, specifically Na,K-ATPase activity.
- Diabetic nephropathy, a major complication of IDDM, involves changes in glomerular filtration and tubular function.
- C-peptide, a byproduct of insulin synthesis, was historically considered biologically inactive.
Purpose:
- To review the tubular effects of C-peptide in IDDM patients.
- To elucidate the molecular mechanisms behind C-peptide's influence on tubular Na,K-ATPase activity.
- To assess the potential therapeutic benefits of C-peptide in managing diabetic kidney disease.
Summary:
- IDDM patients exhibit altered Na,K-ATPase activity in the kidneys, contributing to renal failure.
- C-peptide replacement therapy in IDDM patients has shown improvements in both glomerular and tubular renal function.
- Animal studies indicate C-peptide stimulates Na,K-ATPase activity, explaining its renal protective effects.
Impact:
- C-peptide demonstrates biological activity, challenging previous assumptions.
- Findings support the consideration of C-peptide therapy for IDDM patients with kidney complications.
- Understanding C-peptide's mechanism could lead to novel treatments for diabetic nephropathy.