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Related Experiment Videos

Tim-3 expression in human kidney allografts.

Viviane C Ponciano1, Paulo G Renesto, Eliana Nogueira

  • 1Laboratory of Clinical and Experimental Immunology, Nephrology Division, Universidade Federal de São Paulo, Rua Botucatu 740, Vila Clementino, 04023-900, São Paulo, SP, Brazil.

Transplant Immunology
|March 3, 2007
PubMed
Summary
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T-cell immunoglobulin and mucin domain-containing protein 3 (Tim-3) expression was lower in rejected kidney grafts, correlating with regulatory roles in acute rejection. Lower Tim-3 levels indicate poorer response to anti-rejection therapy.

Area of Science:

  • Immunology
  • Transplantation immunology
  • Molecular biology

Background:

  • T-cell immunoglobulin and mucin domain-containing protein 3 (Tim-3) is a Th1-specific molecule involved in immune regulation and allograft tolerance.
  • This study investigates Tim-3 mRNA expression in rejected human kidney grafts alongside markers of T-cell activation and cytotoxicity.

Purpose of the Study:

  • To quantify intragraft Tim-3 mRNA expression in human kidney grafts undergoing acute rejection.
  • To correlate Tim-3 expression with molecular markers of T-cell activation, cytotoxicity, and response to anti-rejection therapy.

Main Methods:

  • Real-time RT-PCR was used to quantify mRNA expression of Tim-3, granzyme B, perforin, IFN-gamma, and Fas-ligand in 20 rejected human kidney grafts.
  • Protocol biopsies served as controls, and statistical analyses were performed to compare groups and assess associations.

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Main Results:

  • All studied molecules were significantly upregulated in rejected grafts compared to controls (p<0.001).
  • Severe acute rejection (Type III) showed high granzyme B and perforin expression, but the lowest Tim-3 levels.
  • Lower Tim-3 expression correlated with a lack of response to anti-rejection therapy and positively with IFN-gamma levels (r(2)=0.73; p<0.001).

Conclusions:

  • Acute rejection involves both inflammatory and regulatory factors.
  • Severe acute kidney graft rejection is characterized by increased cytotoxic molecule expression and decreased expression of potential regulatory molecules like Tim-3.