Document Detail


Characterization of avascular corneal wound healing fibroblasts. New insights into the myofibroblast.
MedLine Citation:
PMID:  3565534     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The characteristics and derivation of corneal wound healing fibroblasts (myofibroblasts) were evaluated by studying the temporal changes in the cellular actin distribution of corneal fibrocytes following full thickness 3-mm diameter central corneal wounds in the rabbit. Under certain conditions these wounds heal without neovascularization, allowing for the detailed analysis of invading fibroblasts with minimal contamination by other cell types. The authors employed transmission electron microscopy to localize microfilaments, fluorescent microscopy using NBD-phallacidin, a mushroom toxin which binds specifically to f-actin and oligomeres of g-actin, to localize actin filaments, and isoelectric focusing gels to characterize actin isotypes. During the early stages of wound healing (1-7 days) there is a gradual change in the corneal fibrocytes adjacent to the wound margin characterized by the development of extensive rough endoplasmic reticulum, microtubules, a prominent Golgi apparatus, and a cortical microfilament network. This is in contrast to the normal fibrocyte, which, for the most part, lacks these structures. The development of microfilaments correlated with increased NBD-phallacidin fluorescence of fibrocytes adjacent to the wound as compared with fibrocytes farther removed from the site of injury. Fibroblasts appearing within the wound from 7 days to 2 months after injury had ultrastructural characteristics similar to those of myofibroblasts, including parallel arrays of microfilaments, stress fibers and cell-cell, cell-matrix attachments. Furthermore, these cells stained intensely with NBD-phallacidin, supporting the ultrastructural findings. At 1 month after injury, cells contained within the wound possessed predominantly nonmuscle isoactins (gamma) as seen by silver staining of isoelectric focusing gels, but little or no (smooth muscle) isoactins could be detected. Moreover, no significant differences could be detected between electrophoretic profiles obtained from wounded versus normal corneas. These morphologic and biochemical data suggest that the corneal fibrocyte may develop into a fibroblastlike cell similar to the myofibroblast, and is characterized by a marked increase in filamentous actin.
Authors:
J V Jester; M M Rodrigues; I M Herman
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The American journal of pathology     Volume:  127     ISSN:  0002-9440     ISO Abbreviation:  Am. J. Pathol.     Publication Date:  1987 Apr 
Date Detail:
Created Date:  1987-05-13     Completed Date:  1987-05-13     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0370502     Medline TA:  Am J Pathol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  140-8     Citation Subset:  AIM; IM    
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MeSH Terms
Descriptor/Qualifier:
Actins / analysis
Animals
Cell Differentiation
Cornea / cytology*,  injuries
Fibroblasts / cytology*
Microscopy, Electron
Rabbits
Wound Healing
Chemical
Reg. No./Substance:
0/Actins
Comments/Corrections

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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