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Mesenchymal Stem Cells

Mesenchymal Stem Cells

Mesenchymal stem cells (MSCs) are adult stem cells that can differentiate into most connective tissue cell types, except for hematopoietic cells, depending upon the source of MSCs. For example, bone-marrow-derived MSCs (BM-MSCs) can differentiate into osteocytes, hepatocytes, and pancreatic and neuronal cells. MSCs can be isolated from various sources such as bone marrow, placenta, adipose tissue, teeth, and Wharton’s jelly, a gelatinous substance in the umbilical cord. The ease of their...

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Evaluation of Stem Cell Therapies in a Bilateral Patellar Tendon Injury Model in Rats

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Prevascularized Bone Marrow-Derived Mesenchymal Stem Cell Sheets Promote Tendon-Bone Integration in Rotator Cuff

Yexin Li¹, Yang Chen¹, Yaxi Zhu²

¹Department of Orthopaedics, The Second Xiangya Hospital, Central South University, Changsha, People's Republic of China.

The Journal of Bone and Joint Surgery. American Volume

|March 12, 2026

Summary

Prevascularized bone marrow-derived mesenchymal stem cell sheets significantly improved rotator cuff tendon-bone healing by promoting vascularization and enhancing structural integrity. This approach may offer a new biologic adjunct for rotator cuff repair.

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Published on: May 21, 2013

Area of Science:

Regenerative Medicine
Biomaterials Science
Orthopedic Surgery

Background:

Rotator cuff healing is limited by poor vascularization at the tendon-bone interface.
Cell sheet technology shows promise for interfacial repair, but prevascularization strategies are underexplored.

Purpose of the Study:

To investigate the efficacy of prevascularized bone marrow-derived mesenchymal stem cell (BMSC) sheets in enhancing tendon-bone healing.
To assess the impact of prevascularization on vascularization, structural properties, and mechanical strength at the tendon-bone interface.

Main Methods:

Bilateral infraspinatus tendon repair was performed in rabbits.
BMSC sheets, with or without prevascularization via coculture with endothelial cells, were implanted at the tendon-bone interface.
Healing was evaluated using gross observation, histology, immunohistochemistry, gene expression, and biomechanical testing at 6 weeks.

Main Results:

Prevascularized BMSC sheets significantly increased vascularization at the tendon-bone interface compared to non-prevascularized sheets.
Enhanced expression of collagen type II alpha 1 and interleukin 10 was observed with prevascularized sheets.
Biomechanical testing revealed significantly greater ultimate failure load and stiffness in the prevascularized group.

Conclusions:

Prevascularization of BMSC sheets effectively promotes angiogenesis and improves the structural and mechanical aspects of tendon-bone healing.
Prevascularized BMSC sheets represent a promising biologic adjunct for enhancing rotator cuff repair outcomes.