TGF-β of lung cancer microenvironment upregulates B7H1 and GITRL expression in dendritic cells and is associated with regulatory T cell generation

Ni,Xiao  Yan; Sui,Hua  Xiu; Liu,Yao; Ke,Shi  Zhong; Wang,Yi  Nan; Gao,Feng  Guang

doi:10.3892/or.2012.1822

TGF-β of lung cancer microenvironment upregulates B7H1 and GITRL expression in dendritic cells and is associated with regulatory T cell generation

Authors:
- Xiao Yan Ni
- Hua Xiu Sui
- Yao Liu
- Shi Zhong Ke
- Yi Nan Wang
- Feng Guang Gao
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Affiliations: Department of Immunology, Basic Medicine Science, Medical College, Xiamen University, Xiamen 361005, P.R. China
Published online on: May 18, 2012 https://doi.org/10.3892/or.2012.1822
Pages: 615-621

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Abstract

The effects of TGF-β on dendritic cells (DCs) on the tumor microenvironment are not well understood. We report, here, the establishment of an in vitro lung cancer microenvironment by co-incubation of seminaphtharhodafluor (SNARF) labeled Lewis lung cancer (LLC) cells, carboxyfluorescein succinimidyl ester (CFSE) labeled fibroblasts and 4-chloromethyl-7-hydroxycoumarin (CMHC) labeled DCs. Raw 264.7, EL4 and NCI-H446 cells were able to synthesize TGF-β which was determined by flow cytometry and western blotting, respectively. Furthermore, TGF-β efficiently increased regulatory T-cell (Treg) expansion and upregulated DC B7H1 and GITRL expression. TGF-β and the co-incubation of LLC cells, fibroblasts with DCs could augment the expression of B7H1 and GITRL molecules of DCs. The data presented here indicate that the B7H1 and GITRL molecules may play an important role in TGF-β-induced Treg expansion of lung cancer microenvironment.

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