[Experimental study of actin and myosin in the scar tissue]

To investigate the different expression of actin, myosin II in hypertrophic scars, keloids and normal skins, and to understand the relationship of actin, myosin II and the scar contracture.

Fifteen cases with hypertrophic scars, 10 cases with keloids and 15 cases with normal skins were chosen randomly. The expression of actin and myosin II were detected by immunohistochemical method in the hypertrophic scars, keloids and normal skins. The fibroblasts isolated from three types of tissue were cultured in vitro, then actin and myosin II in three different fibroblasts were measured using flow cytometry.

The immunohistochemical staining of myosin II in hypertrophic scars was positive, while the staining in keloids and normal skins were negative. The positive rate of myosin II expression in hypertrophic scars, keloids and normal skins were (95.11 +/- 2.78)%, (16.86 +/- 7.11)%, and (5.31 +/- 1.79)% respectively. There were significant difference between keloids and the two others(P < 0.01). The actin expression in three difference tissues were positive, there were no significant difference in hypertrophic scars, keloids and normal skins(P > 0.05). The positive rate of actin expression in hypertrophic scars, keoids and normal skins were(77.77 +/- 15.43)%, (88.89 +/- 10.29)%, and (82.92 +/- 13.48)% respectively, and there were no significant difference(P > 0.05).

Myosin II may play an important role in the scar contracture. Actin is the contractile protein of cell, it plays important role in cellular movement. Actin is necessary protein in the cell.