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Quantification of the Immunosuppressant Tacrolimus on Dried Blood Spots Using LC-MS/MS
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Quantification of the Immunosuppressant Tacrolimus on Dried Blood Spots Using LC-MS/MS

Published on: November 8, 2015

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The calcineurin inhibitor tacrolimus reduces proteinuria in membranous nephropathy accompanied by a decrease in

Lei Peng1, Jing Ma2, Rui Cui2

  • 1Department of Nephrology, 2nd Affiliated Hospital of Harbin Medical University, Harbin, People's Republic of China; Department of Nephrology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, People's Republic of China.

Plos One
|August 29, 2014
PubMed

Insights

Tacrolimus reduces proteinuria in membranous nephropathy by lowering angiopoietin-like-4 (Angptl4) in podocytes, promoting kidney repair. This study reveals a key mechanism for tacrolimus in treating this kidney disease.

Area of Science:

  • Nephrology
  • Immunology
  • Molecular Biology

Background:

  • Membranous nephropathy (MN) is a leading cause of nephrotic syndrome in adults.
  • Tacrolimus, an immunosuppressant, shows promise in reducing proteinuria in MN patients.
  • The underlying mechanisms of tacrolimus's renoprotective effects in MN are not fully understood.

Purpose of the Study:

  • To elucidate the mechanism by which tacrolimus reduces proteinuria in a model of membranous nephropathy.
  • To investigate the role of angiopoietin-like-4 (Angptl4) in podocyte injury and proteinuria in MN.
  • To determine the effect of tacrolimus on Angptl4 expression and podocyte health.

Main Methods:

  • Passive Heymann nephritis (PHN) was induced in rats to model MN.
  • Tacrolimus or vehicle was administered from day 7 to 28 post-induction.
  • Glomerular and urinary Angptl4 levels, desmin expression, immune deposits, and IgG levels were assessed.

Main Results:

  • PHN induced significant proteinuria, increased desmin, and markedly upregulated glomerular and urinary Angptl4, primarily in podocytes.
  • Tacrolimus treatment significantly reduced proteinuria, glomerular and urinary Angptl4 levels, and desmin expression.
  • Tacrolimus also decreased glomerular immune deposits and circulating IgG levels, promoting podocyte repair.

Conclusions:

  • This study demonstrates that tacrolimus reduces Angptl4 expression in podocytes in MN.
  • Tacrolimus treatment leads to decreased proteinuria and promotes podocyte repair in MN.
  • The findings reveal a novel mechanism involving Angptl4 modulation for tacrolimus's efficacy in membranous nephropathy.

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