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pubmed-article:19633657pubmed:abstractTextObesity and its associated metabolic syndromes represent a growing global challenge, yet mechanistic understanding of this pathology and current therapeutics are unsatisfactory. We discovered that CD4(+) T lymphocytes, resident in visceral adipose tissue (VAT), control insulin resistance in mice with diet-induced obesity (DIO). Analyses of human tissue suggest that a similar process may also occur in humans. DIO VAT-associated T cells show severely biased T cell receptor V(alpha) repertoires, suggesting antigen-specific expansion. CD4(+) T lymphocyte control of glucose homeostasis is compromised in DIO progression, when VAT accumulates pathogenic interferon-gamma (IFN-gamma)-secreting T helper type 1 (T(H)1) cells, overwhelming static numbers of T(H)2 (CD4(+)GATA-binding protein-3 (GATA-3)(+)) and regulatory forkhead box P3 (Foxp3)(+) T cells. CD4(+) (but not CD8(+)) T cell transfer into lymphocyte-free Rag1-null DIO mice reversed weight gain and insulin resistance, predominantly through T(H)2 cells. In obese WT and ob/ob (leptin-deficient) mice, brief treatment with CD3-specific antibody or its F(ab')(2) fragment, reduces the predominance of T(H)1 cells over Foxp3(+) cells, reversing insulin resistance for months, despite continuation of a high-fat diet. Our data suggest that the progression of obesity-associated metabolic abnormalities is under the pathophysiological control of CD4(+) T cells. The eventual failure of this control, with expanding adiposity and pathogenic VAT T cells, can successfully be reversed by immunotherapy.lld:pubmed
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pubmed-article:19633657pubmed:articleTitleNormalization of obesity-associated insulin resistance through immunotherapy.lld:pubmed
pubmed-article:19633657pubmed:affiliationDepartment of Pediatrics & Immunology, Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada.lld:pubmed
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