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Leptin deficiency impairs maturation of dendritic cells and enhances induction of regulatory T and Th17 cells.

Authors
  • Moraes-Vieira, Pedro M M
  • Larocca, Rafael A
  • Bassi, Enio J
  • Peron, Jean Pierre S
  • Andrade-Oliveira, Vinícius
  • Wasinski, Frederick
  • Araujo, Ronaldo
  • Thornley, Thomas
  • Quintana, Francisco J
  • Basso, Alexandre S
  • Strom, Terry B
  • Câmara, Niels O S
Type
Published Article
Journal
European Journal of Immunology
Publisher
Wiley
Publication Date
Mar 01, 2014
Volume
44
Issue
3
Pages
794–806
Identifiers
DOI: 10.1002/eji.201343592
PMID: 24271843
Source
Medline
Keywords
License
Unknown

Abstract

Leptin is an adipose-secreted hormone that plays an important role in both metabolism and immunity. Leptin has been shown to induce Th1-cell polarization and inhibit Th2-cell responses. Additionally, leptin induces Th17-cell responses, inhibits regulatory T (Treg) cells and modulates autoimmune diseases. Here, we investigated whether leptin mediates its activity on T cells by influencing dendritic cells (DCs) to promote Th17 and Treg-cell immune responses in mice. We observed that leptin deficiency (i) reduced the expression of DC maturation markers, (ii) decreased DC production of IL-12, TNF-α, and IL-6, (iii) increased DC production of TGF-β, and (iv) limited the capacity of DCs to induce syngeneic CD4(+) T-cell proliferation. As a consequence of this unique phenotype, DCs generated under leptin-free conditions induced Treg or TH 17 cells more efficiently than DCs generated in the presence of leptin. These data indicate important roles for leptin in DC homeostasis and the initiation and maintenance of inflammatory and regulatory immune responses by DCs.

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