Abstract:
:We have previously found that ex vivo expanded human CD4+CD25+Treg cells suppress proliferation of lymphoma B-cell lines. Here we demonstrate that the immunomodulatory drug lenalidomide potentiates suppression of lymphoma B-cell proliferation by freshly isolated CD4+CD25+Tregs, as well as suppression by Tregs expanded polyclonally in the presence of rapamycin from CD4+CD25+T cells or CD4+CD25+CD127loT cells. The regulation of lymphoma cell proliferation by Tregs pre-expanded with "third-party" allogeneic MoDCs in the presence of rapamycin was also potentiated by lenalidomide. Lenalidomide contributed to the suppression exerted by Tregs despite concomitant downregulation of Treg proliferation. Lenalidomide did not reduce the suppression of conventional T cells by expanded Tregs. The exposure of polyclonally expanded Tregs to lenalidomide did not significantly alter their phenotype. There was no uniform pattern of lenalidomide effect on Treg-mediated regulation of lymphoma B cells freshly isolated from patients. Freshly isolated lymphoma cells activated with multimeric CD40L and IL-4 to support their survival in vitro varied in their sensitivity to lenalidomide, and the regulatory effect of Tregs on such lymphoma cells ranged from suppression to help in individual patients. Lenalidomide potentiated or attenuated Treg effects on the survival of freshly isolated lymphoma cells. A combination of lenalidomide treatment with adoptive transfer of CD4+CD25+Tregs or CD4+CD25+CD127loTregs expanded ex vivo could be used to suppress proliferation of residual lymphoma in select patients with lymphoma responsive to the regulation by Tregs and sensitive to lenalidomide.
journal_name
Clin Exp Medjournal_title
Clinical and experimental medicineauthors
Grygorowicz MA,Borycka IS,Nowak E,Paszkiewicz-Kozik E,Rymkiewicz G,Błachnio K,Biernacka M,Bujko M,Walewski J,Markowicz Sdoi
10.1007/s10238-016-0411-8subject
Has Abstractpub_date
2017-05-01 00:00:00pages
193-207issue
2eissn
1591-8890issn
1591-9528pii
10.1007/s10238-016-0411-8journal_volume
17pub_type
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