Abstract
The head is innervated by 12 cranial nerves (I–XII) that regulate its sensory and motor functions. Cranial nerves are composed of sensory, motor, or mixed neuronal populations. Sensory neurons perceive generally somatic sensations such as pressure, pain, and temperature. These neurons are also involved in smell, vision, taste, and hearing. Motor neurons ensure the motility of all muscles and glands. Innervation plays an essential role in the development of the various orofacial structures during embryogenesis. Hypoplastic cranial nerves often lead to abnormal development of their target organs and tissues. For example, Möbius syndrome is a congenital disease characterized by defective innervation (i.e., abducens (VI) and facial (VII) nerves), deafness, tooth anomalies, and cleft palate. Hence, it is obvious that the peripheral nervous system is needed for both development and function of orofacial structures. Nerves have a limited capacity to regenerate. However, neural stem cells, which could be used as sources for neural tissue maintenance and repair, have been found in adult neuronal tissues. Similarly, various adult stem cell populations have been isolated from almost all organs of the human body. Stem cells are tightly regulated by their microenvironment, the stem cell niche. Deregulation of adult stem cell behavior results in the development of pathologies such as tumor formation or early tissue senescence. It is thus essential to understand the factors that regulate the functions and maintenance of stem cells. Yet, the potential importance of innervation in the regulation of stem cells and/or their niches in most organs and tissues is largely unexplored. This review focuses on the potential role of innervation in the development and homeostasis of orofacial structures and discusses its possible association with stem cell populations during tissue repair.
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Acknowledgments
The authors wish to thank the European Science Foundation (ESF) COST Action 1005 NAMABIO for the financial support of the short-term mission No. 020913-033584 (P.P.). This work was supported by the Swiss National Foundation (SNSF) grant 31003A-135633 (T.A.M.), and funds from the University of Zurich (L.J.-R., P.P., T.M.).
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Pagella, P., Jiménez-Rojo, L. & Mitsiadis, T.A. Roles of innervation in developing and regenerating orofacial tissues. Cell. Mol. Life Sci. 71, 2241–2251 (2014). https://doi.org/10.1007/s00018-013-1549-0
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DOI: https://doi.org/10.1007/s00018-013-1549-0