# The role of T cells in tendon healing

> **NIH NIH R01** · COLUMBIA UNIVERSITY HEALTH SCIENCES · 2024 · $569,726

## Abstract

PROJECT SUMMARY
 Tendon injury is a common problem characterized by slow recovery and high recurrence. Improving
tendon healing to a functionally effective state is therefore a crucial research priority, however the basic
biological mechanisms remain unknown. Our overall objective is therefore to identify the cellular and
molecular events that distinguish healing mechanisms to improve adult tendon healing.
 One key feature in all wound healing is the immune environment. Injury initially induces an inflammatory
type 1 response, followed by transition to an anti-inflammatory type 2 response. Imbalanced type 1 or
type 2 responses are often associated with fibrotic healing or degeneration. To date, T cells have
rarely been investigated, even though T cell subpopulations regulate type 1 and type 2 immune
responses, macrophage polarization, and in some cases can directly active tissue-resident stem cells. Due
to this gap in research, the mechanisms by which specific immune cell populations create
permissive environments for effective and poor healing are not known, especially for poor healing
tissues such as tendon.
 We previously established novel models of effective tendon healing (neonatal mouse) and
fibrosis (adult mouse), and identified cellular mechanisms that distinguish these. Based on rigorous pilot data,
we now hypothesize that T cell subpopulations mediate tendon healing through direct and indirect
interactions with tenocytes and by mediating effective tendon healing or chronic inflammation via IL33-
dependent mechanisms. To test these hypotheses, we will define the role of neonatal vs adult T cell
populations and T cell-tenocyte interactions after tendon injury (Aim 1), elucidate the mechanisms of Treg-
mediated resolution of IL33 in tendon healing (Aim 2), and determine the pathological consequences of
chronic IL33 inflammation in tendon healing (Aim 3)

## Key facts

- **NIH application ID:** 10891720
- **Project number:** 5R01AR081674-02
- **Recipient organization:** COLUMBIA UNIVERSITY HEALTH SCIENCES
- **Principal Investigator:** Alice H Huang
- **Activity code:** R01 (R01, R21, SBIR, etc.)
- **Funding institute:** NIH
- **Fiscal year:** 2024
- **Award amount:** $569,726
- **Award type:** 5
- **Project period:** 2023-08-01 → 2028-07-31

## Primary source

NIH RePORTER: https://reporter.nih.gov/project-details/10891720

## Citation

> US National Institutes of Health, RePORTER application 10891720, The role of T cells in tendon healing (5R01AR081674-02). Retrieved via AI Analytics 2026-05-23 from https://api.ai-analytics.org/grant/nih/10891720. Licensed CC0.

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