期刊
JOURNAL OF HAND SURGERY-AMERICAN VOLUME
卷 34A, 期 3, 页码 495-503出版社
W B SAUNDERS CO-ELSEVIER INC
DOI: 10.1016/j.jhsa.2008.10.032
关键词
Adhesion; tendon; TGF-beta 1
Purpose Adhesion formation around zone II flexor tendon repairs remains an important clinical challenge. Tendon healing is complex, and when uncontrolled it may lead to adhesion formation. Transforming growth factor-beta 1 (TGF-beta 1) is a multipotent growth factor known to be involved in wound healing and scar formation. It has also been shown to have a role in both tendon healing and adhesion formation. Methods Uninjured rabbit flexor tendons were divided into endotenon, epitenon, and sheath cells and cultured separately. The in vitro effect of TGF-beta 1 gene expression was determined on quiescent tendon cells using real-time polymerase chain reaction for collagen type 1, collagen type 3, fibronectin, plasminogen activator inhibitor-1 (PAL-1), and tissue plasminogen activator (t-PA). Results Endotenon-derived cells showed a statistically significant down-regulation of collagen type 1 gene expression in response to TGF-beta 1 compared with untreated endotenon cells and with both epitenon and sheath cells at a number of time points. However, endotenon cells showed an increase in collagen type 3 gene expression compared with untreated cells and epitenon cells. All cells showed a statistically significant increase in fibronectin in the later time points compared with the untreated cells. Endotenon-derived cells showed an early increase in PAI-1, whereas sheath cells showed a later increase. Conclusions We have shown that cells cultured from 3 separate parts of the flexor tendon-sheath complex respond in different ways when stimulated with TGF-beta 1. The down-regulation of collagen types 1 and 3 in endotenon cells may give further insight into the effects of TGF-beta 1 in tendon healing. Also, the upregulation of fibronectin and PAI-1, combined with a down-regulation of tissue plasminogen activator, could explain the association of TGF-beta 1 with tendon adhesion formation. Treatments aimed at improving tendon healing and the prevention of adhesions may arise from modification of the effects of TGF-beta 1. (J Hand Surg 2009;34A:495-503. Copyright (C) 2009 by the American Society for Surgery of the Hand. All rights reserved.)
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