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Intraglomerular Dysfunction Predicts Kidney Failure in Type 2 Diabetes.

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Intraglomerular hemodynamic dysfunction, specifically the afferent-to-efferent arteriolar resistance ratio and intraglomerular pressure, strongly predicts end-stage kidney disease in type 2 diabetes. These factors also correlate with kidney structural damage in diabetic kidney disease.

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Area of Science:

  • Nephrology
  • Diabetology
  • Cardiovascular Physiology

Background:

  • Longitudinal data linking intraglomerular hemodynamic dysfunction to end-stage kidney disease (ESKD) in type 2 diabetes (T2D) is lacking.
  • Intraglomerular pressure (PGLO) and arteriolar resistance (RA, RE) are crucial but not directly measurable in humans.

Purpose of the Study:

  • To examine the association of the afferent-to-efferent arteriolar resistance ratio (RA-to-RE) and PGLO with ESKD incidence in Pima Indian individuals with T2D.
  • To investigate the correlation of these hemodynamic parameters with kidney structural lesions in diabetic kidney disease (DKD).

Main Methods:

  • Utilized serial measures of glomerular filtration rate (GFR) and renal plasma flow (RPF) in 237 Pima Indian individuals with T2D.
  • Estimated RA, RE, and PGLO from GFR, RPF, blood pressure, hematocrit, and plasma oncotic pressure.
  • Employed latent class analysis to identify hemodynamic trajectories and correlated findings with kidney structural lesions in a subset of 111 participants.

Main Results:

  • Distinct hemodynamic trajectories, including increasing RA-to-RE ratio and elevated PGLO, strongly predicted incident ESKD (HR 4.60 and 2.96, respectively).
  • PGLO and RA-to-RE ratio were significantly correlated with mesangial fractional volume (R² = 21% and 15%, respectively), a structural predictor of DKD progression.
  • 69 out of 237 participants progressed to ESKD during a median follow-up of 17.5 years.

Conclusions:

  • Intraglomerular hemodynamic parameters, including the RA-to-RE ratio and PGLO, are significant predictors of ESKD in individuals with T2D.
  • These hemodynamic factors are also associated with structural kidney damage, highlighting their role in DKD pathogenesis and progression.