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Reversibility of structural and functional damage in a model of advanced diabetic nephropathy

Warangkana Pichaiwong1, Kelly L Hudkins, Tomasz Wietecha

  • 1Department of Pathology, University of Washington, Seattle, Washington 98195, USA.

Journal of the American Society of Nephrology : JASN
|May 4, 2013
PubMed

Insights

Leptin replacement reversed advanced diabetic nephropathy in mice, unlike renin-angiotensin-aldosterone system inhibition. This suggests leptin therapy may restore lost podocytes, offering new insights into diabetic kidney disease treatment.

Area of Science:

  • Nephrology
  • Endocrinology
  • Diabetology

Background:

  • Diabetic nephropathy (DN) reversibility is debated.
  • Leptin deficiency exacerbates DN.
  • BTBR ob/ob mice model advanced DN.

Purpose of the Study:

  • To investigate leptin replacement for reversing advanced DN in BTBR ob/ob mice.
  • To compare leptin's effects with renin-angiotensin-aldosterone system (RAAS) inhibition.
  • To explore podocyte regeneration mechanisms in DN.

Main Methods:

  • Utilized leptin-deficient BTBR ob/ob mice to model advanced diabetic nephropathy.
  • Administered leptin replacement therapy.
  • Inhibited the renin-angiotensin-aldosterone system (RAAS).
  • Assessed structural (mesangial matrix, podocyte loss) and functional (proteinuria, oxidative stress) markers of DN.
  • Used immunohistochemistry for podocyte markers (Wilms tumor 1, p57).

Main Results:

  • Leptin replacement nearly fully reversed structural and functional DN markers.
  • RAAS inhibition did not reverse advanced diabetic nephropathy.
  • Parietal epithelial cells were identified as a potential source for regenerating podocytes.
  • Podocyte regeneration was observed following leptin therapy.

Conclusions:

  • Advanced diabetic nephropathy in BTBR ob/ob mice is reversible with leptin replacement.
  • Leptin therapy, not RAAS inhibition, promotes podocyte regeneration.
  • This study provides a model for reversible advanced DN and suggests novel therapeutic strategies.

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