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Interaction between human mature adipocytes and lymphocytes induces T-cell proliferation.

Abstract：

BACKGROUND AIMS:Adipose tissue is a critical organ that plays a major role in energy balance regulation and the immune response through intricate signals. METHODS:We report on the inter-relation between mature adipocytes and lymphocytes in terms of adipocyte-derived T-cell chemo-attractants and adipocyte metabolic effects on lymphocytes. RESULTS:During the culture time, mature adipocytes changed their structural and functional properties into de-differentiated cells. Isolated mature adipocytes expressed significantly higher levels of CIITA, major histocompatibility complex II (human leukocyte antigen [HLA]-DR) and costimulatory signal molecule CD80 compared with adipocytes after the de-differentiation process. Moreover, human leukocyte antigen-G, which may prevent the immune responses of mesenchymal stromal cells, was expressed at lower level in mature adipocytes compared with de-differentiated adipocytes. In line with these molecular data, functional results showed different immunoregulatory properties between adipocytes before and after the de-differentiation process. Mature adipocytes stimulated the proliferation of total lymphocytes and immunoselected cell populations CD3+, CD4+ and CD8+ in a direct contact-dependent way that involved the major histocompatibility complex I and II pathways. Moreover, adipocytes secreted potential chemo-attractant factors, but data showed that adipocyte-derived culture medium was not sufficient to activate lymphocyte proliferation, suggesting that a direct contact between adipocytes and immune cells was needed. However, specific mature adipocyte cytokines enhanced lymphocyte proliferation in a mixed lymphocyte reaction. CONCLUSIONS:In conclusion, cross-talk occurs between adipocytes and lymphocytes within adipose tissue involving T-cell chemo-attraction by mature adipocytes. Our findings, together with current observations in the field, provide a rationale to identify adipocyte-lymphocyte cross-talk that instigates adipose inflammation.

journal_name

Cytotherapy

journal_title

Cytotherapy

authors

Poloni A,Maurizi G,Ciarlantini M,Medici M,Mattiucci D,Mancini S,Maurizi A,Falconi M,Olivieri A,Leoni P

doi

10.1016/j.jcyt.2015.06.007

subject

Has Abstract

pub_date

2015-09-01 00:00:00

pages

1292-301

issue

eissn

1465-3249

issn

1477-2566

pii

S1465-3249(15)00937-8

journal_volume

pub_type

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Interaction between human mature adipocytes and lymphocytes induces T-cell proliferation.