title: Effect of mechanical stimulation on cell proliferation in mouse epidermis and on growth regulation by endogenous factors (chalones).
abstract: Mechanical stimulation of dorsal mouse skin by skin massage or removal of the horny layer results in a mutually comparable increase in DNA-labelling and mitotic activity. However, only after injury such as removal of the horny layer hyperplasia develops. This phenomenon, called "hyperplastic transformation" is characterized by a transient abolition of the epidermal G1 chalone responsiveness. There is some indication that the susceptibility to a heat labile factor, probably the epidermal G2 chalone, is not affected. Skin massage neither interferes with the responsiveness to epidermal G1 chalone nor induces "hyperplastic transformation". Mouse tail epidermis shows a "functional hyperplasia" and responds to the G1 chalone. To explain these observations, it is assumed that the epidermal stem cell population is heterogeneous consisting of G1 chalone-sensitive and G1 chalone-insensitive cells.
mesh_terms: D000818:Animals; D004247:DNA / Q000096:biosynthesis; D005260:Female; D006131:Growth Inhibitors / Q000494:pharmacology*; D007700:Kinetics; D051379:Mice; D008938:Mitosis / Q000187:drug effects; D010812:Physical Stimulation; D012867:Skin / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism
chemical_list: D006131:Growth Inhibitors; D004247:DNA