Modulation of corneal fibroblast contractility within fibrillar collagen matrices

PURPOSE: To investigate the migratory and contractile behavior of isolated human corneal fibroblasts in fibrillar collagen matrices. METHODS: A telomerase-infected, extended-lifespan human corneal fibroblast cell line (HTK) was transfected by using a vector for enhanced green fluorescent protein (GFP)-alpha-actinin. Cells were plated at low density on top of or within 100-microm-thick fibrillar collagen lattices. After 18 hours to 7 days, time-lapse imaging was performed. At each 1- to 3-minute interval, GFP and Nomarski differential interference contrast (DIC) images were acquired in rapid succession. Serum-containing (S+) medium was used initially for perfusion. After 2 hours, perfusion was switched to either serum-free (S-) or S+ medium containing the Rho-kinase inhibitor Y-27632 for 1 to 2 hours. Finally, perfusion was changed back to S+ medium for 1 hour. RESULTS: Two to 4 days after plating, many cells underwent spontaneous contraction and/or relaxation in S+ medium. A decrease in the distance between consecutive alpha-actinin-dense bodies along stress fibers was measured during contraction, and focal adhesion and matrix displacements correlated significantly. Removal of serum or inhibition of Rho-kinase induced cell body elongation and relaxation of matrix stress, as confirmed using finite element modeling. Rapid formation and extension of pseudopodia and filopodia were also observed, and transient tractional forces were generated by these extending processes. CONCLUSIONS: Cultured human corneal fibroblasts can undergo rapid changes in the subcellular pattern of force generation that are mediated, in part, by Rho-kinase. Sarcomeric shortening of stress fibers in contracting corneal fibroblasts is also demonstrated for the first time.

Vishwanath, Mridula
Ma, Lisha
Otey, Carol A.
Jester, James V.
Petroll, W. Matthew
Item Type: 
Journal Article
Publication Title: 
Investigative Ophthalmology & Visual Science
Journal Abbreviation: 
Invest. Ophthalmol. Vis. Sci.
Publication Date: 
Publication Year: 
Library Catalog: 
NCBI Published Medical (?)
PMID: 14578392

Turabian/Chicago Citation

Mridula Vishwanath, Lisha Ma, Carol A. Otey, James V. Jester and W. Matthew Petroll. 2003-11. "Modulation of corneal fibroblast contractility within fibrillar collagen matrices." Investigative Ophthalmology & Visual Science 44: 11: 4724-4735.

Wikipedia Citation

<ref> {{Cite journal | doi = | issn = 0146-0404 | volume = 44 | pages = 4724-4735 | last = Vishwanath | first = Mridula | coauthors = Ma, Lisha, Otey, Carol A., Jester, James V., Petroll, W. Matthew | title = Modulation of corneal fibroblast contractility within fibrillar collagen matrices | journal = Investigative Ophthalmology & Visual Science | date = 2003-11 | pmid = | pmc = }} </ref>