Rapid generation of clinical-grade antiviral T cells: selection of suitable T-cell donors and GMP-compliant manufacturing of antiviral T cellsReportar como inadecuado




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Journal of Translational Medicine

, 12:336

Cell, tissue and gene therapy

Abstract

BackgroundThe adoptive transfer of allogeneic antiviral T lymphocytes derived from seropositive donors can safely and effectively reduce or prevent the clinical manifestation of viral infections or reactivations in immunocompromised recipients after hematopoietic stem cell HSCT or solid organ transplantation SOT. Allogeneic third party T-cell donors offer an alternative option for patients receiving an allogeneic cord blood transplant or a transplant from a virus-seronegative donor and since donor blood is generally not available for solid organ recipients. Therefore we established a registry of potential third-party T-cell donors allogeneic cell registry, alloCELL providing detailed data on the assessment of a specific individual memory T-cell repertoire in response to antigens of cytomegalovirus CMV, Epstein-Barr virus EBV, adenovirus ADV, and human herpesvirus HHV 6.

MethodsTo obtain a manufacturing license according to the German Medicinal Products Act, the enrichment of clinical-grade CMV-specific T cells from three healthy CMV-seropositive donors was performed aseptically under GMP conditions using the CliniMACS cytokine capture system CCS after restimulation with an overlapping peptide pool of the immunodominant CMVpp65 antigen. Potential T-cell donors were selected from alloCELL and defined as eligible for clinical-grade antiviral T-cell generation if the peripheral fraction of IFN-γ T cells exceeded 0.03% of CD3 lymphocytes as determined by IFN-γ cytokine secretion assay.

ResultsStarting with low concentration of IFN-γ T cells 0.07-1.11% we achieved 81.2%, 19.2%, and 63.1% IFN-γCD3 T cells 1.42 × 10, 0.05 × 10, and 1.15 × 10 after enrichment. Using the CMVpp65 peptide pool for restimulation resulted in the activation of more CMV-specific CD8 than CD4 memory T cells, both of which were effectively enriched to a total of 81.0% CD8IFN-γ and 38.4% CD4IFN-γ T cells. In addition to T cells and NKT cells, all preparations contained acceptably low percentages of contaminating B cells, granulocytes, monocytes, and NK cells. The enriched T-cell products were stable over 72 h with respect to viability and ratio of T lymphocytes.

ConclusionsThe generation of antiviral CD4 and CD8 T cells by CliniMACS CCS can be extended to a broad spectrum of common pathogen-derived peptide pools in single or multiple applications to facilitate and enhance the efficacy of adoptive T-cell immunotherapy.

KeywordsAdoptive immunotherapy Antiviral T cells alloCELL GMP-compliant manufacturing CliniMACS CCS Stem cell transplantation Adoptive T-cell transfer Electronic supplementary materialThe online version of this article doi:10.1186-s12967-014-0336-5 contains supplementary material, which is available to authorized users.

Sabine Tischer, Christoph Priesner, Ulrike Koehl and Britta Eiz-Vesper contributed equally to this work.

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Autor: Sabine Tischer - Christoph Priesner - Hans-Gert Heuft - Lilia Goudeva - Wolfgang Mende - Marc Barthold - Stephan Kloeß - L

Fuente: https://link.springer.com/







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