Cited by 71Tissue Engineering and Regenerative MedicineTendon Structure and TreatmentBone Tissue Engineering Materials

Human Flexor Tendon Tissue Engineering: Decellularization of Human Flexor Tendons Reduces Immunogenicity In Vivo

Raghavan, Shyam S., Woon, Colin Y.L., Kraus, Armin, Megerle, Kai, Choi, Matthew S.S., Pridgen, Brian C., Pham, Hung, Chang, James·2012·Tissue Engineering Part A

Abstract

BACKGROUND: In mutilating hand injuries, tissue engineered tendon grafts may provide a reconstructive solution. We have previously described a method to decellularize cadaveric human flexor tendons while preserving mechanical properties and biocompatibility. The purpose of this study is to evaluate the immunogenicity and strength of these grafts when implanted into an immunocompetent rat model. METHODS: Cadaveric human flexor tendons were divided into two groups. Group 1 was untreated, and Group 2 was decellularized by treatment with sodium dodecyl sulfate (SDS), ethylenediaminetetraacetic acid (EDTA), and peracetic acid (PAA). Both groups were then analyzed for the presence of major histocompatibility complexes by immunohistochemistry (IHC). Pair-matched tendons from each group were then placed into the dorsal subcutaneous tissue and anchored to the spinal ligaments of Wistar rats for 2 or 4 weeks, and harvested. The infiltration of B-cells and macrophages was determined using IHC. The explants where then subjected to mechanical testing to determine the ultimate tensile stress (UTS) and elastic modulus (EM). Statistical analysis was performed using a paired Student's t-test. RESULTS: The decellularization protocol successfully removed cells and MHC-1 complexes. At 2 weeks after implantation, there was increased infiltration of B-cells in Group 1 (untreated) compared with Group 2 (acellular), both in the capsule and tendon substance. There was improved ultimate tensile stress (UTS, 42.7 ± 8.3 vs. 22.8 ± 7.8 MPa, p<0.05) and EM (830.2 ± 206.7 vs. 421.2 ± 171.3 MPa, p<0.05) in tendons that were decellularized. At 4 weeks, there was continued B-cell infiltration in Group 1 (untreated) compared with Group 2 (acellular). There was no appreciable difference in macrophage infiltration at both time points. At 4 weeks Group 2 (acellular) demonstrated persistently greater UTS (40.5 ± 9.1 vs. 14.6 ± 4.2 MPa, p<0.05) and EM (454.05 ± 101.5 vs. 204.6 ± 91.3 MPa, p<0.05) compared with Group 1 (untreated). CONCLUSIONS: Human flexor tendons that were decellularized with SDS, EDTA, and PAA resulted in removal of cellular antigens and a decreased immune response when placed into Wistar rats. These grafts showed better mechanical properties at 2 and 4 weeks when compared with control tendons. Decellularization is an important step toward the use of tissue engineered flexor tendons in upper extremity reconstruction.

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Crossref · 10.1089/ten.tea.2011.0422

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  • Raghavan et al. found that the immunogenicity of decellular human tendons was suppressed following implantation into the subcutaneous tissue on the backs of immunologically normal rats.

    “Raghavan et al. investigated the development of an implant method to assess the surgical suitability of tendon grafts and discovered that the immunogenicity of decellular human tendons was suppressed following implantation into the subcutaneous tissue on the backs of immunologically normal rats.”

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Authors
Raghavan, S. S., Woon, C. Y. L., Kraus, A., Megerle, K., Choi, M. S. S., Pridgen, B. C., Pham, H., & Chang, J.
Affiliations
VA Palo Alto Health Care System (US)
Venue
Tissue Engineering Part A
Published
2012-04
Volume
18
Issue
7-8
Pages
796-805
ISSN
  • 1937-3341 (ISSN-L)
  • 1937-335X
OpenAlex
W2061673735
Cited by
71
References
35
Citations by year
2026: 2 · 2025: 2 · 2024: 2 · 2023: 2 · 2022: 3 · 2021: 5 · 2020: 2 · 2019: 8 · 2018: 4 · 2017: 5 · 2016: 7 · 2015: 7 · 2014: 3 · 2013: 13 · 2012: 6
FWCI
7.21
Type
journal article
Language
en
Open access
closed
Locations
  • Tissue Engineering Part A (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Surgery › Tissue Engineering and Regenerative Medicine
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Tendon Structure and Treatment
  • Physical Sciences › Engineering › Biomedical Engineering › Bone Tissue Engineering Materials
Keywords
decellularization, immunogenicity, major histocompatibility complex, B cell infiltration, macrophage infiltration, ultimate tensile strength, elastic modulus, mechanical properties, hand injuries, peracetic acid, EDTA, SDS, cadaveric tendons, immunocompetent patient, graft biocompatibility
MeSH terms
Animals, Electrophoresis, Polyacrylamide Gel, Humans, Immunohistochemistry, Male, Rabbits, Tendons, Rats, Wistar, Tissue Engineering

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