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RP105 involved in activation of mouse macrophages via TLR2 and TLR4 signaling

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Abstract

RP105 is a member of the toll-like receptor family of proteins that transmits an activation signal in B cells, playing a role in regulation of B cell growth and death; in macrophages and dendritic cells, RP105 is a specific inhibitor of TLR4 signaling. RP105 is uniquely important for regulating TLR4-dependent signaling. It also proved that RP105 is closely related to TLR2 in macrophage activation by Mycobacterium tuberculosis lipoproteins. The aim of our study is to investigate the role of RP105 in mouse macrophages activation of TLR4 and TLR2 signaling by lipopolysaccharides (LPS) and Pam3CysSerLys4 (Pam3CSK4) alone or in combination, and the interaction between TLR2 and TLR4 signaling through RP105. Our results indicate that besides exhibiting negative regulation of TNF-α and IL12-p40 secretion in macrophage activated by LPS, RP105 is also involved in macrophages activation by Pam3CSK4 through TLR2 signaling and exhibited regulation to IL-10 and RANTES production by mouse peritoneal macrophage activated by Pam3CSK4. In macrophages activation by LPS and Pam3CSK4 in combination, TLR2 signaling can overcome RP105-mediated regulation of TLR4 signaling. Thus, our data demonstrate that not only TLR4 signaling, but also RP105 appears to be an essential accessory for immune responses through TLR2 signaling. The function of TLR2 and TLR4 in response to TLR ligands could be associated with each other by RP105. These results can help us understanding the unique role of RP105 in macrophages response to TLR ligands.

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Acknowledgments

This study was supported by a Grant from the National Natural Science Foundation of China (Nos. 30972225, 30771596) and the Research Fund for the Doctoral Program of Higher Education of China (No. 20110061130010). We are grateful to Prof. Yongjun Yang and Qisheng Peng for technical assistance.

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Authors and Affiliations

  1. College of Animal Science and Veterinary Medicine, Jilin University, Changchun, 130062, People’s Republic of China

    Bo Liu, Naisheng Zhang, Zhicheng Liu, Yunhe Fu, Yongguo Cao, Depeng Li, Dejie Liang, Fengyang Li, Xiaojing Song & Zhengtao Yang

  2. Key Lab of Zoonosis Research, Ministry of Education, Institute of Zoonosis, Jilin University, Changchun, 130062, People’s Republic of China

    Shuang Feng

  3. Institute for Food Toxicology and Analytical Chemistry, University of Veterinary Medicine Hannover, 30173, Hannover, Federal Republic of Germany

    Shan Wang

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  1. Bo Liu
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Correspondence to Zhengtao Yang.

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Liu, B., Zhang, N., Liu, Z. et al. RP105 involved in activation of mouse macrophages via TLR2 and TLR4 signaling. Mol Cell Biochem 378, 183–193 (2013). https://doi.org/10.1007/s11010-013-1609-7

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