Abstract
Semaphorins and their receptors have diverse functions in axon guidance, organogenesis, vascularization and/or angiogenesis, oncogenesis and regulation of immune responses1,2,3,4,5,6,7,8,9,10,11. The primary receptors for semaphorins are members of the plexin family2,12,13,14. In particular, plexin-A1, together with ligand-binding neuropilins, transduces repulsive axon guidance signals for soluble class III semaphorins15, whereas plexin-A1 has multiple functions in chick cardiogenesis as a receptor for the transmembrane semaphorin, Sema6D, independent of neuropilins16. Additionally, plexin-A1 has been implicated in dendritic cell function in the immune system17. However, the role of plexin-A1 in vivo, and the mechanisms underlying its pleiotropic functions, remain unclear. Here, we generated plexin-A1-deficient (plexin-A1−/−) mice and identified its important roles, not only in immune responses, but also in bone homeostasis. Furthermore, we show that plexin-A1 associates with the triggering receptor expressed on myeloid cells-2 (Trem-2), linking semaphorin-signalling to the immuno-receptor tyrosine-based activation motif (ITAM)-bearing adaptor protein, DAP12. These findings reveal an unexpected role for plexin-A1 and present a novel signalling mechanism for exerting the pleiotropic functions of semaphorins.
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Acknowledgements
We thank K. Kubota for excellent secretarial assistance. We are grateful to H. Murayama and S. Sato for critical discussion and excellent bone analysis, including microCT and histology. We are also grateful to N. Yamamoto, H. Takayanagi, T. Nakano, I. Ishikawa, H. Arase, N. Yamada, T. Kaisho and K. Hoshino for providing materials, critical advice, discussion and encouragement. We also thank T. Yazawa, A. Kawai, J. Yoshida, K Shiozaki, N. Okita, N. Iwami and K. Nakamura for technical support. This study was supported by research grants from the Ministry of Education, Culture, Sports, Science and Technology, Japan and from the Core Research for Evolutional Science and Technology (CREST) program of the Japanese Science and Technology Agency (JST) to A.K. and H.K.
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N.T. performed the main experimental work and data analysis for bone analysis. H.T. performed the main experimental work and data analysis for the immune responses. T.T., T.T., T.O., K.Y., M.M., M.Y., D.V.R.P., K.S. and S.S. also performed experimental work. M.I. performed calcium signalling analysis. S.A., K.T., M.I. and M.O. were involved in generating knockout mice. M.I. and T.T. performed the DAP12 analysis. A.K. and H.K. co-organized and performed project planning, data analysis, discussion and writing.
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Takegahara, N., Takamatsu, H., Toyofuku, T. et al. Plexin-A1 and its interaction with DAP12 in immune responses and bone homeostasis. Nat Cell Biol 8, 615–622 (2006). https://doi.org/10.1038/ncb1416
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DOI: https://doi.org/10.1038/ncb1416
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