Document Detail

Evidence that translocation of collagen fibril segments plays a role in early intrinsic tendon repair.
MedLine Citation:
PMID:  22286444     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Severed tendon repair advances with either a scar through extrinsic repair or regeneration through intrinsic repair. The authors examined whether intrinsic tendon repair reintroduces embryonic fibrillogenesis, whereby preformed collagen fibril segments are incorporated into growing collagen fibers at wound edges.
METHODS: Isolated tendons from 10-day-old chicken embryos were suspended in 1 mg/ml of the antibiotic gentamicin for 90 days, which released fibril segments that were fluorescently tagged with rhodamine. Tendons isolated from 14-day-old chicken embryos were wounded to half their diameter and then maintained as explants in stationary organ culture. Fluorescent-tagged fibril segments were introduced to wounded tendon explants in the presence of high concentrations of neomycin, an antibiotic; cycloheximide, a protein synthesis inhibitor; cytochalasin D, a disruptor of microfilaments; and colchicine, a disruptor of microtubules. At 24 hours, explants were viewed by means of fluorescent microscopy.
RESULTS: Untreated, wounded tendon explants showed the translocation of fluorescent-tagged fibril segments from the explant surface to accumulation at wound edges. In the presence of high concentrations of neomycin, cytochalasin D, or colchicine, fluorescent-tagged fibril segments failed to accumulate at wound edges and were retained on the explant surface. Inhibition of protein synthesis by cycloheximide did not alter the accumulation of fluorescent-tagged fibril segments at wound edges.
CONCLUSIONS: Inhibiting fluorescent-tagged fibril segment accumulation by antibiotics is consistent with their role in releasing fibril segments. Experimental findings show fibril segment translocation and accumulation at wound edges involves microfilaments and microtubules, but not protein synthesis. The experiments support the hypothesis that intrinsic tendon repair advances through the incorporation of fibril segments at wound edges.
J Stephen Gunn; H Paul Ehrlich
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Plastic and reconstructive surgery     Volume:  129     ISSN:  1529-4242     ISO Abbreviation:  Plast. Reconstr. Surg.     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-01-30     Completed Date:  2012-03-19     Revised Date:  2014-10-13    
Medline Journal Info:
Nlm Unique ID:  1306050     Medline TA:  Plast Reconstr Surg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  300e-306e     Citation Subset:  AIM; IM    
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MeSH Terms
Chick Embryo
Collagen / physiology*,  ultrastructure
Tendon Injuries*
Tendons / embryology
Wound Healing*
Grant Support
Reg. No./Substance:

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