# 3D Bioprinting of Biomimetic Constructs for Rotator Cuff Augmentation

> **NIH NIH R01** · UNIVERSITY OF NEBRASKA MEDICAL CENTER · 2020 · $226,495

## Abstract

Project Summary
Rotator cuff tendon tears account for more than 4.5 million physician visits per year, and over 250,000 rotator
cuff repair surgeries are performed annually in the United States. For massive rotator cuff defect or chronic
tears with significant retraction and tissue loss, multiple strategies, including auto-, allo- and xenografts as well
as synthetic implants, have been used to augment the bone-tendon junction to improve the rates of successful
healing of these severe rotator cuff tears. Despite the current advances in tissue augmentation, the overall
failure rate has been reported to be between 38% and 65%. Obstacles in the development of approaches to
address tendon-to-bone healing are partly because (1) current augmentation options fail to mimic multizoal
structure of native rotator cuff tissue; (2) uniform matrix microenvironment impedes the heterogeneous
differentiation and vascularization of progenitor cells/mesenchymal stem cells (MSC); (3) limited knowledge
has been gained about how MSC differentiation status and vascularization pattern within different zonal region
affect rotator cuff healing. We have developed a novel strategy by combining 3D bioprinting technique with
biotextile technique to generate engineered rotator cuff constructs with zonal structure and spatial bioactive
factor distribution. The proposed studies will test the hypothesis that tendon-to-bone regeneration is enhanced
in vitro and in vivo by spatial differentiation of adipose derived MSC (ADMSC) and spatial control of
vascularization degree in pre-designed region in the optimized bioprinted microenvironment. The specific aims
of the studies are (i) determine how spatial differentiation of ADMSC within bioprinted rotator cuff constructs
affect tendon-to-bone healing; and (ii) determine how the spatially incorporated bioactive factors regulate
ADMSC differentiation, vascularization and rotator cuff repair. A massive rabbit infraspinatus tendon defect
model will be employed for both of the aims. The primary outcome measures will include inflammation,
construct integration, collagen fiber alignment, collagen types in different regions, muscle quality and fat
infiltration, and tensile biomechanics. This proposal will develop biological augmentation strategies to promote
scarless healing. Our approach is to better understand the roles of exogenous stem cells and vasculature on
tendon-to-bone interface regeneration in vitro and in vivo.

## Key facts

- **NIH application ID:** 9933808
- **Project number:** 5R01AR073225-03
- **Recipient organization:** UNIVERSITY OF NEBRASKA MEDICAL CENTER
- **Principal Investigator:** Bin Duan
- **Activity code:** R01 (R01, R21, SBIR, etc.)
- **Funding institute:** NIH
- **Fiscal year:** 2020
- **Award amount:** $226,495
- **Award type:** 5
- **Project period:** 2018-06-01 → 2023-05-31

## Primary source

NIH RePORTER: https://reporter.nih.gov/project-details/9933808

## Citation

> US National Institutes of Health, RePORTER application 9933808, 3D Bioprinting of Biomimetic Constructs for Rotator Cuff Augmentation (5R01AR073225-03). Retrieved via AI Analytics 2026-05-25 from https://api.ai-analytics.org/grant/nih/9933808. Licensed CC0.

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