# Regulation of Dental Pulp Stem Cell Polarization for Tubular Dentin Regeneration

> **NIH NIH R01** · UNIVERSITY OF MISSOURI-COLUMBIA · 2024 · $417,340

## Abstract

Project Summary
Stem-cell based strategy has been widely considered as a promising approach to replace damaged pulp and
dentin structures and restore their biological functions in regenerative endodontics. However, regeneration of
functional tubular dentin has been a challenge owing to the lack of understanding dental pulp stem cell (DPSC)
polarization and differentiation as well as the underlying mechanism that are prerequisite for tubular dentin
regeneration. A unique biomimetic 3D platform was recently developed to study DPSC polarization and
differentiation in the PI’s group. This platform can precisely manipulate single cells on each microisland of the
3D platform and is an excellent tool to decipher the biophysical and biochemical signals that initiate and regulate
DPSC polarization at the single cell level. A variety of biophysical factors were screened using this 3D platform,
and the nanofibrous architecture and tubular structure of the matrix were identified to be the two critical
biophysical factors that initiate and regulate DPSC polarization. The combination of RNA-seq with laser
microdissection techniques and a conditional knockout model further identified that TGF-1 is a crucial
biochemical factor for odontogenesis. Consequently, the hypothesis of this work is that DPSC polarization is
controlled by a dynamic signaling network composed of a set of critical biophysical and biochemical factors, and
integration of these factors in scaffolding design will regenerate tubular dentin from DPSCs. Therefore, the
overall objective of this proposal is to explore and optimize the parameters that initiate/modulate DPSC
polarization, understand the underlying mechanism of DPSC polarization, and regenerate tubular dentin in vivo.
To accomplish the overall objective for this project, three specific aims are proposed. Aim 1 will explore how the
biomimetic tubular matrix modulates DPSC polarization and differentiation. Aim 2 will examine how TGF-1
regulates DPSC polarization and differentiation. Aim 3 will integrate TGF-1 into the biomimetic tubular matrix
to regenerate tubular dentin in vivo. Successfully completing this work will fundamentally advance the
understanding of DPSC polarization and differentiation, and greatly promote the ability to develop new bio-
inspired matrices to regenerate functional tubular dentin for regenerative dental therapies.

## Key facts

- **NIH application ID:** 10903890
- **Project number:** 5R01DE032540-03
- **Recipient organization:** UNIVERSITY OF MISSOURI-COLUMBIA
- **Principal Investigator:** Xiaohua Liu
- **Activity code:** R01 (R01, R21, SBIR, etc.)
- **Funding institute:** NIH
- **Fiscal year:** 2024
- **Award amount:** $417,340
- **Award type:** 5
- **Project period:** 2024-01-19 → 2028-08-31

## Primary source

NIH RePORTER: https://reporter.nih.gov/project-details/10903890

## Citation

> US National Institutes of Health, RePORTER application 10903890, Regulation of Dental Pulp Stem Cell Polarization for Tubular Dentin Regeneration (5R01DE032540-03). Retrieved via AI Analytics 2026-05-24 from https://api.ai-analytics.org/grant/nih/10903890. Licensed CC0.

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