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Abstract
A controlled frictional stimulus, produced by a rotating brush, was applied daily to hamster cheek pouch for periods of up to 14 days. Pouch epithelium was examined for changes in histological appearance, and for alteration in the rate of cell proliferation as studied by injection of Vinblastine or tritiated thymidine. Specimens which had received seven or more daily applications of friction showed a marked increase in the thickness of the stratum corneum and an increase in the size and number of cells in the stratum Malpighii. There was a significant increase in the number of metaphase figures and labelled cells per unit length of rubbed epithelium. No significant difference in the length of the DNA synthesis phase was detected. The epithelial response to friction appears to be essentially similar to the epithelial response to other forms of physical or chemical trauma.
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