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http://dx.doi.org/10.5397/cise.2021.00395

Protocatechuic acid impacts rotator cuff healing and reduces fatty degeneration in a chronic rotator cuff tear model in rats  

Seo, Su-Jung (Department of Orthopedic Surgery, Hallym University College of Medicine)
Park, Jae-Young (Department of Pathology, Bucheon Sejong Hospital)
Park, Hyoung-Jin (Department of Physiology, Hallym University College of Medicine)
Hwang, Jung-Taek (Department of Orthopedic Surgery, Hallym University Chuncheon Sacred Heart Hospital, Hallym University College of Medicine)
Publication Information
Clinics in Shoulder and Elbow / v.25, no.1, 2022 , pp. 5-14 More about this Journal
Abstract
Background: The purpose of this study was to verify the effect of protocatechuic acid (PCA) on tendon healing and fatty degeneration in a chronic rotator cuff model. Methods: Twenty-eight Sprague-Dawley male rats were randomly allocated into two groups: Saline+repair (SR) and PCA+repair (PR). The right shoulder was used for experimental interventions, and the left served as a control. PCA (30 mg/kg/day) was administered intraperitoneally at the site of infraspinatus tendon detachment in rats in the PR group, and the same volume of saline was administered to the same site in the SR group. The torn tendon was repaired 4 weeks after infraspinatus detachment. Four weeks after repair, hematoxylin and eosin (H&E), S100, and CD68 stains were performed to evaluate the degree of fatty degeneration and H&E and Masson trichrome stains were performed to assess tendon healing. Superoxide dismutase (SOD) was measured to test the efficacy of PCA as an antioxidant. Results: Results from histological evaluation indicated that SOD and CD68 levels at the musculotendinous region and collagen fiber parallel to the orientation at the tendon-to-bone junction were not significantly different between the SR and PR groups. The mean load-to-failure of the PR group (20.32±9.37 N) was higher than that of the SR group (16.44±6.90 N), although this difference was not statistically significant (p=0.395). The SOD activity in the operative side infraspinatus muscle of the PR group was higher than that of the SR group, but the difference was not statistically significant (p=0.053). Conclusions: The use of PCA could improve tendon healing and decrease fatty degeneration after rotator cuff repair.
Keywords
Protocatechuic acid; Antioxidant; Rotator cuff tear; Tendon healing; Fatty degeneration;
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