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Impact of rituximab on the T-cell flow cytometric crossmatch.

Abstract：

:Rituximab is frequently used in the setting of ABO-incompatible renal transplants, and highly sensitized patients. Its interference with B-cell flow cytometric crossmatch (B-FCXM) is well known. However, its effect on the T-cell flow cytometric crossmatch (T-FCXM) has not been described. We aimed to evaluate the effect of rituximab on the T-FCXM using non-pronase and pronase treated donor lymphocytes and compare results with the single antigen bead (SAB) assay. In this retrospective study, 28 patients on rituximab therapy were evaluated against 30 donors. Using non-pronase treated donor lymphocytes, all 30 FCXMs showed strong B-cell positivity {median (IQR) B-cell ratio: 184.65 (253.17)} which significantly reduced {1.0 (1.18); p < 0.00001} with pronase treatment. 'T-cell tailing' phenomenon was observed in 17/30 FCXMs in the non-pronase group as a 'tail of T-cells', indicating a rare sub-population. However, it disappeared in the pronase-treated group. SAB assay did not show donor-specific antibodies (DSA) in all 17 patients with 'T-cell tailing' phenomenon. Although, rituximab is described to impact only B-FCXM, we have consistently found 'T-cell tailing' in 57% of T-FCXMs, which clears with pronase treatment. The 'T-cell tailing' led to weak positive T-FCMX ratios due to increased MFI in the FL1 channel. However, the absence of DSA in all recipients reinforces the fact that this is a false positive finding and should not be misconstrued as a possible class I DSA. Structural homology of Fc receptors on activated T-cells to CD20 could be a possible explanation of the same and provide insight into a novel mechanism of action of rituximab.

journal_name

Transpl Immunol

journal_title

Transplant immunology

authors

Doss SA,Mittal S,Daniel D

doi

10.1016/j.trim.2020.101360

subject

Has Abstract

pub_date

2021-02-01 00:00:00

pages

101360

eissn

0966-3274

issn

1878-5492

pii

S0966-3274(20)30197-0

journal_volume

64

pub_type

杂志文章

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