Mast cells and Th17 cells contribute to the lymphoma-associated pro-inflammatory microenvironment of angioimmunoblastic T-cell lymphoma

Claudio Tripodo, Giorgia Gri, Pier Paolo Piccaluga, Barbara Frossi, Carla Guarnotta, Silvia Piconese, Giovanni Franco, Valeria Vetri, Carlo Ennio Pucillo, Ada Maria Florena, Mario Paolo Colombo, Stefano Aldo Pileri

Research output: Contribution to journalArticlepeer-review

Abstract

Reports focusing on the immunological microenvironment of peripheral T-cell lymphomas (PTCL) are rare. Here we studied the reciprocal contribution of regulatory (Treg) and interleukin-17-producing (Th17) T-cells to the composition of the lymphoma-associated microenvironment of angioimmunoblastic T-cell lymphoma (AITL) and PTCL not otherwise specified on tissue microarrays from 30 PTCLs not otherwise specified and 37 AITLs. We found that Th17 but not Treg cells were differently represented in the two lymphomas and correlated with the amount of mast cells (MCs) and granulocytes, which preferentially occurred in the cellular milieu of AITL cases. We observed that MCs directly synthesized interleukin-6 and thus contribute to the establishment of a proinflammatory, Th17 permissive environment in AITL. We further hypothesized that the AITL clone itself could be responsible for the preferential accumulation of MCs at sites of infiltration through the synthesis of CXCL-13 and its interaction with the CXCR3 and CXCR5 receptors expressed on MCs. Consistent with this hypothesis, we observed MCs efficiently migrating in response to CXCL-13. On these bases, we conclude that MCs have a role in molding the immunological microenvironment of AITL toward the maintenance of pro-inflammatory conditions prone to Th17 generation and autoimmunity.

Original languageEnglish
Pages (from-to)792-802
Number of pages11
JournalAmerican Journal of Pathology
Volume177
Issue number2
DOIs
Publication statusPublished - Aug 2010

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

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