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Updated: Apr 25, 2026

Quantification of the Immunosuppressant Tacrolimus on Dried Blood Spots Using LC-MS/MS
Published on: November 8, 2015
The calcineurin inhibitor tacrolimus reduces proteinuria in membranous nephropathy accompanied by a decrease in
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.
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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