Open AccessEPIDERMAL REGENERATION AFTER CELLOPHANE TAPE STRIPPING OF HAIRLESS MOUSE SKIN
Author(s) -
Hennings Henry,
Elgjo Kjell
Publication year - 1970
Publication title -
cell proliferation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.647
H-Index - 74
eISSN - 1365-2184
pISSN - 0960-7722
DOI - 10.1111/j.1365-2184.1970.tb00269.x
Subject(s) - hairless , colcemid , mitosis , epidermis (zoology) , cellophane , dna synthesis , mitotic index , stripping (fiber) , labelling , thymidine , dna , chemistry , regeneration (biology) , microbiology and biotechnology , biology , anatomy , biochemistry , organic chemistry , engineering , electrical engineering
After repeated applications of cellophane tape to the dorsal skin of hairless mice, the proliferative response in the treated epidermis was estimated by three different methods. The mitotic rate was determined in the interfollicular epidermis using the Colcemid technique, and the DNA synthetic activity was estimated after 3 H‐thymidine injection by counting labelled interfollicular cells in autoradiographs and by determining the specific activity of epidermal DNA. An initial 40–50% inhibition of DNA synthesis and mitosis was followed by an increase in the labelling index and the mitotic rate 8–10 hr after tape stripping. By 24 hr, peak values 5–6 times the controls were attained for both parameters. The labelling index and the mitotic rate were nearly normal at 3–4 days, but a second small peak was seen on day 5. Normal values were found on days 6 and 8. A similar pattern of response was found biochemically, but the peak of DNA specific activity was much broader and the extent of the increase was only about half as great as the increase in the labelling index. Possible reasons for these differences are discussed.