(Journal Article): Transforming growth factor (TGF)-beta1-producing regulatory T cells induce Smad-mediated interleukin 10 secretion that facilitates coordinated immunoregulatory activity and amelioration of TGF-beta1-mediated fibrosis.
 
Kitani A, Fuss I, Nakamura K, Kumaki F, Usui T, Strober W (National Institute of Allergy and Infectious Diseases, National Institutes of Health, Building 10, Room 11N238, 10 Center Drive, Bethesda, MD 20892, USA.)
 
IN: J Exp Med 2003; 198(8):1179-1188
Impact Factor(s) of J Exp Med: 14.588 (2004), 15.302 (2003), 15.34 (2001)

Fulltext:    HTML  PDF

ABSTRACT: Interleukin (IL)-10 and transforming growth factor (TGF)-beta1 are suppressor cytokines that frequently occur together during a regulatory T cell response. Here we used a one gene doxycycline (Dox)-inducible plasmid encoding TGF-beta1 to analyze this association and test its utility. In initial studies, we showed that intranasal administration of this plasmid (along with Dox) led to the appearance of TGF-beta1-producing cells (in spleen and lamina propria) and the almost concomitant appearance of IL-10-producing cells. Moreover, we showed that these cells exert Dox-regulated suppression of the T helper cell (Th)1-mediated inflammation in trinitrobenzene sulfonic acid colitis. In subsequent in vitro studies using retroviral TGF-beta1 expression, we established that IL-10 production by Th1 cells occurs after exposure to TGF-beta1 from either an endogenous or exogenous source. In addition, using a self-inactivating retrovirus luciferase reporter construct we showed that TGF-beta1 induces Smad4, which then binds to and activates the IL-10 promoter. Furthermore, intranasal TGF-beta1 plasmid administration ameliorates bleomycin-induced fibrosis in wild-type but not IL-10-deficient mice, strongly suggesting that the amelioration is IL-10 dependent and that IL-10 protects mice from TGF-beta1-mediated fibrosis. Taken together, these findings suggest that the induction of IL-10 by TGF-beta1 is not fortuitous, but instead fulfills important requirements of TGF-beta1 function after its secretion by regulatory T cells.

TYPE OF PUBLICATION: Original article

Articles citing this article:

• Thomas D, Zaccone P, Cooke A. The Role of Regulatory T Cell Defects in Type I Diabetes and the Potential of these Cells for Therapy. Rev Diabetic Stud 2005. 2: 9-18.
  » Diabetes OD » Reversal/Prevention of Diabete... » T1DM » Re-establishing Tolerance » Modifying Immunity » Journal Article