Open AccessSOME EFFECTS OF BLEOMYCIN ON THE PROLIFERATION, MATURATION TIME and PROTEIN SYNTHESIS OF HAIRLESS MOUSE EPIDERMIS
Author(s) -
Iversen Olav H.,
Clausen Ole P. F.,
Iversen Ulla M.,
Rohrbach Rolf
Publication year - 1976
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.1365-2184.1976.tb01255.x
Subject(s) - hairless , epidermis (zoology) , bleomycin , mitosis , cell cycle , dna synthesis , cell growth , biology , cell , cell division , microbiology and biotechnology , biochemistry , in vitro , anatomy , genetics , chemotherapy
Hairless mice were given 2 mg Bleomycin i.p. in 1‐0 ml saline on two successive days. By a stathmokinetic method, by micro‐flow fluorometry and by autoradiography certain kinetic parameters were measured during 10 days after the last injection. Cell counts were made and the turnover time of the differentiating cells estimated. Protein synthesis was estimated by the uptake of radioactive histidine, and dry cell mass measured by weighing. Bleomycin affected cell proliferation in the epidermis by depressing biphasically both the number of cells in, and the passage of cells through, the cell cycle phases: S, G 2 and M, most probably by directly affecting late Gj cells and cells in mitosis. The time between the two minima of depressed DNA synthesis corresponded to the mean generation time of the basal cells. Histidine uptake and dry cell mass were slightly affected, but the turnover time of the differentiating cells was prolonged. Bleomycin thus had a strong long‐lasting inhibitory effect on epidermal cell proliferation and a marked inhibitory effect on epidermal cell maturation in mice.