Trigeminal ganglion and tooth innervation modifications following genetic and pharmacological Nogo-A inhibition
Pirenne, L.; Balic, A.; De Santis, I.; Bevilacqua, A.; Lai, C. F.; Pagella, P.; Schwab, M. E.; Mitsiadis, T. A.
Show abstract
Nogo-A is a major regulator of neural development and regeneration, but its role in tooth innervation remains largely unknown. Neurons from trigeminal ganglia support teeth homeostasis and regeneration, and disorders of their function could have significant pathophysiological consequences. In this study, we show that Nogo-A is expressed in the trigeminal ganglia and in the neurons innervating the teeth, and that its deletion affects both the number and patterning of neurons in teeth. In organotypic cultures, Nogo-A blocking antibodies affect the trigeminal ganglia-derived neuronal outgrowths and allow premature innervation of tooth germs. RNA sequencing analysis revealed that Nogo-A deletion induces alterations linked to functions at synapses and interference with neurotrophin signalling during the differentiation and maturation of trigeminal neurons. Taken together, these results reveal for the first time the importance of Nogo-A as a major regulator of tooth innervation and point to its potential as a clinical therapeutic target.
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