Peroxisome proliferator-activated receptor-γ agonists prevent in vivo remodeling of human artery induced by alloreactive T cells

Zuzana Tobiasova, Lufeng Zhang, Tai Yi, Linfeng Qin, Thomas D. Manes, Sanjay Kulkarni, Marc I. Lorber, Frederick C. Rodriguez, Je Min Choi, George Tellides, Jordan S. Pober, Ivana Kawikova, Alfred L.M. Bothwell

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


BACKGROUND-: Ligands activating the transcription factor peroxisome proliferator-activated receptor-γ (PPARγ) have antiinflammatory effects. Vascular rejection induced by allogeneic T cells can be responsible for acute and chronic graft loss. Studies in rodents suggest that PPARγ agonists may inhibit graft vascular rejection, but human T-cell responses to allogeneic vascular cells differ from those in rodents, and the effects of PPARγ in human transplantation are unknown. METHODS AND RESULTS-: We tested the effects of PPARγ agonists on human vascular graft rejection using a model in which human artery is interposed into the abdominal aorta of immunodeficient mice, followed by adoptive transfer of allogeneic (to the artery donor) human peripheral blood mononuclear cells. Interferon-γ-dependent rejection ensues within 4 weeks, characterized by intimal thickening, T-cell infiltrates, and vascular cell activation, a response resembling clinical intimal arteritis. The PPARγ agonists 15-deoxy-prostaglandin-J2, ciglitazone, and pioglitazone reduced intimal expansion, intimal infiltration of CD45RO memory T cells, and plasma levels of inflammatory cytokines. The PPARγ antagonist GW9662 reversed the protective effects of PPARγ agonists, confirming the involvement of PPARγ-mediated pathways. In vitro, pioglitazone inhibited both alloantigen-induced proliferation and superantigen-induced transendothelial migration of memory T cells, indicating the potential mechanisms of PPARγ effects. CONCLUSION-: Our results suggest that PPARγ agonists inhibit allogeneic human memory T cell responses and may be useful for the treatment of vascular graft rejection.

Original languageEnglish (US)
Pages (from-to)196-205
Number of pages10
Issue number2
StatePublished - Jul 12 2011
Externally publishedYes


  • PPARλ
  • T-lymphocytes
  • arteriosclerosis
  • mice
  • vascular diseases

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)


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