Apr 22, 2020

Tgfbr2 in dental pulp cells guides sensory innervation in developing teeth

BioRxiv : the Preprint Server for Biology
C. BarkleySarah Beth Peters

Abstract

Transforming growth factor {beta} (TGF{beta}) plays an important role in tooth morphogenesis and mineralization. Our laboratory established a mouse model in which Tgfbr2 was conditionally deleted in the dental pulp (DP) mesenchyme using an Osterix promoter-driven Cre recombinase (Tgfbr2cko). These mice survived postnatally, but had significant defects in bones and teeth, including reduced mineralization and short roots. H&E staining revealed reduced axon-like structures in the mutant mice. Reporter imaging demonstrated that Osterix-Cre activity was localized within the tooth and was active in the DP and derivatives, but not in neurons. Previous research has established that paracrine signals from the dental pulp attract trigeminal axons toward and into the tooth during postnatal development, yet very little is known about the signals that regulate tooth innervation. Immunofluorescent staining for a neuronal marker, {beta}3 tubulin, was performed on serial cryosections from control and mutant molars at two different postnatal stages. Confocal imaging and pixel quantification of {beta}3 tubulin demonstrated reduced innervation in P7 and P24 Tgfbr2cko first molars compared to controls, indicating that the signals necessary to prom...Continue Reading

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