Preservation of renal function by intensive glycemic control

Area of Science:

• Nephrology
• Endocrinology
• Diabetology

Background:

• Type 1 diabetes mellitus (T1DM) is a leading cause of end-stage renal disease.
• Diabetic nephropathy is characterized by glomerular, tubulointerstitial, and vascular lesions.
• The long-term impact of intensive glycemic control on different histological components of diabetic nephropathy requires further investigation.

Purpose of the Study:

• To evaluate the long-term effects of intensive glycemic control on the progression of diabetic nephropathy in a T1DM patient.
• To assess the impact of intensive management on glomerular, tubulointerstitial, and vascular lesions over 15 years.

Main Methods:

• Case report of a 67-year-old Japanese woman with T1DM and diabetic nephropathy.
• Two renal biopsies performed 15 years apart.
• Hemoglobin A1c (HbA1c) levels monitored, with intensive glycemic control initiated after the first biopsy.
• Histopathological comparison of renal lesions between the two biopsies.

Main Results:

• Initial HbA1c of 10.0% improved to 6.0% with intensive glycemic control, halting renal dysfunction progression for 15 years.
• Second renal biopsy showed no progression in glomerular lesions.
• Significant progression observed in tubulointerstitial fibrosis and vascular lesions despite intensive glycemic control.

Conclusions:

• Intensive blood glucose control effectively prevents the progression of glomerular lesions in diabetic nephropathy.
• Intensive glycemic control may not halt the progression of tubulointerstitial fibrosis and vascular lesions.
• Long-term histological changes underscore the complexity of managing diabetic kidney disease.