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Vol. 12, Issue 9, 2730-2741, September 2001

Alpha-Smooth Muscle Actin Expression Upregulates Fibroblast Contractile Activity

Boris Hinz,* Giuseppe Celetta,* James J. Tomasek,dagger Giulio Gabbiani,* and Christine Chaponnier*

 *Department of Pathology, CMU, University of Geneva, 1211 Geneva 4, Switzerland; and  dagger Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73104

To evaluate whether alpha -smooth muscle actin (alpha -SMA) plays a role in fibroblast contractility, we first compared the contractile activity of rat subcutaneous fibroblasts (SCFs), expressing low levels of alpha -SMA, with that of lung fibroblasts (LFs), expressing high levels of alpha -SMA, with the use of silicone substrates of different stiffness degrees. On medium stiffness substrates the percentage of cells producing wrinkles was similar to that of alpha -SMA-positive cells in each fibroblast population. On high stiffness substrates, wrinkle production was limited to a subpopulation of LFs very positive for alpha -SMA. In a second approach, we measured the isotonic contraction of SCF- and LF-populated attached collagen lattices. SCFs exhibited 41% diameter reduction compared with 63% by LFs. TGFbeta 1 increased alpha -SMA expression and lattice contraction by SCFs to the levels of LFs; TGFbeta -antagonizing agents reduced alpha -SMA expression and lattice contraction by LFs to the level of SCFs. Finally, 3T3 fibroblasts transiently or permanently transfected with alpha -SMA cDNA exhibited a significantly higher lattice contraction compared with wild-type 3T3 fibroblasts or to fibroblasts transfected with alpha -cardiac and beta - or gamma -cytoplasmic actin. This took place in the absence of any change in smooth muscle or nonmuscle myosin heavy-chain expression. Our results indicate that an increased alpha -SMA expression is sufficient to enhance fibroblast contractile activity.


dagger Corresponding author. E-mail address: Giulio.Gabbiani{at}medecine.unige.ch.


Molecular Biology of the Cell
Vol. 12, 2730-2741, September 2001
Copyright © 2001 by The American Society for Cell Biology



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B. Hinz, G. Gabbiani, and C. Chaponnier
The NH2-terminal peptide of {alpha}-smooth muscle actin inhibits force generation by the myofibroblast in vitro and in vivo
J. Cell Biol., May 13, 2002; 157(4): 657 - 663.
[Abstract] [Full Text] [PDF]


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D.P. Brock, R. Marty-Roix, and M. Spector
{alpha}-Smooth-muscle Actin in and Contraction of Porcine Dental Pulp Cells
Journal of Dental Research, March 1, 2002; 81(3): 203 - 208.
[Abstract] [Full Text] [PDF]




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