Allospecific CD154+ T-Cytotoxic Memory Cells Identify Recipients Experiencing Acute Cellular Rejection After Renal Transplantation.

03:08 EDT 21st October 2014 | BioPortfolio

Summary of "Allospecific CD154+ T-Cytotoxic Memory Cells Identify Recipients Experiencing Acute Cellular Rejection After Renal Transplantation."

BACKGROUND.: The novel, recently described allo (antigen)-specific CD154+T cells were evaluated for their association with acute cellular rejection (ACR) in 43 adult renal transplant recipients receiving steroid-free tacrolimus after alemtuzumab induction. METHODS.: Single blood samples corresponding to "for cause" allograft biopsies were assayed for CD154+naive or memory T-helper or T-cytotoxic cells in 16-hr mixed leukocyte reaction. RESULTS.: Intra- and interassay variation was less than 10% for a variety of conditions. In logistic regression, leave-one-out cross-validation, and receiver-operating characteristic analyses, the rejection-risk threshold of allospecific CD154+T-cytotoxic memory cells (TcMs) associated best with biopsy-proven ACR with a sensitivity/specificity of 88% in 32 of 43 subjects. Sensitivity/specificity of 100%/88% was replicated in blinded prediction in the remaining 11 subjects. Allospecific CD154+TcM correlated inversely with CTLA4+TcM (Spearman r=-0.358, P=0.029) and increased significantly with increasing histological severity of ACR (P=2.99E-05, Kruskall-Wallis). CONCLUSIONS.: The strong association between ACR and allospecific CD154+TcM may be useful in minimizing protocol biopsies among recipients at reduced rejection risk.

Affiliation

1 Hillman Center for Pediatric Transplantation, Children's Hospital of Pittsburgh of UPMC, University of Pittsburgh, Pittsburgh, PA. 2 Thomas E. Starzl Transplantation Institute, University of Pittsburgh, Pittsburgh, PA. 3 Hillman Center for Pediatric Tra

Journal Details

This article was published in the following journal.

Name: Transplantation
ISSN: 1534-6080
Pages: 433-8

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Medical and Biotech [MESH] Definitions

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The in vitro formation of clusters consisting of a cell (usually a lymphocyte) surrounded by antigenic cells or antigen-bearing particles (usually erythrocytes, which may or may not be coated with antibody or antibody and complement). The rosette-forming cell may be an antibody-forming cell, a memory cell, a T-cell, a cell bearing surface cytophilic antibodies, or a monocyte possessing Fc receptors. Rosette formation can be used to identify specific populations of these cells.

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Complex mental function having four distinct phases: (1) memorizing or learning, (2) retention, (3) recall, and (4) recognition. Clinically, it is usually subdivided into immediate, recent, and remote memory.

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