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Involvement of ERK and JNK pathways in IFN-γ-induced B7-DC expression on tumor cells
Junfang Deng1, Yigang Qian, Lei Geng
1Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, Key Laboratory of Combined Multi-Organ Transplantation, Ministry of Public Health, Key Laboratory of Organ Transplantation, Zhejiang Province, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China.
Purpose:
B7-DC on tumor cells was demonstrated to promote tumor immunity; however, the precise mechanism responsible for the aberrant B7-DC expression remains unknown. Interferon gamma (IFN-γ) can induce B7-DC expression on macrophages and has been shown to regulate anti-tumor immunity by various mechanisms. This study was designed to investigate the relationship of IFN-γ and B7-DC on tumor cells and further explored the signal transduction pathways involved.
Methods:
RT-PCR and flow cytometry were used for the analysis of B7-DC expression on various tumor cells. The phosphorylation of p38, ERK1/2, JNK, Akt, and JAK2 was determined by Western blot.
Results:
IFN-γ markedly up-regulated B7-DC expression on various tumor cells and resulted in the phosphorylation of JAK2, JNK, ERK, p38, and Akt. Inhibition of ERK or JNK pathway significantly decreased IFN-c-induced B7-DC expression, whereas inhibition of phosphorylation of Akt, p38, and JAK2 had very little effect on IFN-γ-induced B7-DC expression.
Conclusions:
Our findings demonstrate that the pretreatment of tumor cells with IFN-γ enhances B7-DC expression through ERK and JNK pathways.
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