Mesenchymal stromal cells support the viability and differentiation of follicular lymphoma-infiltrating follicular helper T-cells.
The biology of follicular lymphoma (FL) is largely dictated by the immune-effector and stromal cells that comprise its tumor microenvironment. FL-infiltrating T-cell populations that are thought to be fundamental to FL biology are follicular helper T-cells (TFH), follicular regulatory T-cells (TFR), a recently described population that regulates TFH activity, and regulatory T-cells (Treg). These T-cell populations have dynamic interactions with mesenchymal stromal cells (MSCs) in the tumor microenvironment. Whereas MSCs have been shown to support FL B-cell and Treg viability, their effects on FL-infiltrating TFH and TFR cells have not been described. Herein we show that MSCs support the viability of FL-infiltrating TFH and TFR, as well as Tregs, in part through an IL-6-dependent mechanism. We further demonstrate that MSCs mediate TFH to TFR conversion by inducing the expression of FoxP3 in TFH cells, demonstrating for the first time that human TFR can be derived from TFH cells. Given that the balance of TFH and TFR populations likely dictate, in part, the biology of this disease, our data support the potential for targeting MSCs as a therapeutic strategy.
James P. Wilmot Cancer Center, University of Rochester Medical Center, Rochester, New York, United States of America.
Michael T
MT
Brady
James P. Wilmot Cancer Center, University of Rochester Medical Center, Rochester, New York, United States of America.
Shannon P
SP
Hilchey
Department of Biostatistics and Computational Biology, University of Rochester Medical Center, Rochester, New York, United States of America.
Ollivier
O
Hyrien
James P. Wilmot Cancer Center, University of Rochester Medical Center, Rochester, New York, United States of America.
Stephen A
SA
Spence
James P. Wilmot Cancer Center, University of Rochester Medical Center, Rochester, New York, United States of America.
Steven H
SH
Bernstein
D001402:B-Lymphocytes / Q000276:immunology; D002470:Cell Survival; D002478:Cells, Cultured; D051858:Forkhead Transcription Factors / Q000096:biosynthesis; D006801:Humans; D015850:Interleukin-6 / Q000378:metabolism / Q000502:physiology; D016246:Lymphocytes, Tumor-Infiltrating / Q000166:cytology / Q000276:immunology*; D008224:Lymphoma, Follicular / Q000276:immunology*; D038041:Lymphopoiesis; D059630:Mesenchymal Stem Cells / Q000378:metabolism / Q000502:physiology*; D014066:Palatine Tonsil / Q000166:cytology; D006377:T-Lymphocytes, Helper-Inducer / Q000166:cytology / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000166:cytology / Q000276:immunology*
C418974:FOXP3 protein, human; D051858:Forkhead Transcription Factors; D015850:Interleukin-6