Abstract:
:Two new mouse epidermal cell lines have been isolated and characterized as target cells for three chemical carcinogens. The ability to grow these cells at low density (approximately 5 clonogenic cells/cm2) has permitted more precise quantitation of chemical carcinogen-induced changes in epidermal differentiation. The cell lines, designated 291 and 271c, retain the property previously observed in primary cultures of mouse epidermal cells, that is the regulation of terminal differentiation by extracellular Ca2+ ion. Altered response to extracellular Ca2+ after carcinogen treatment of these cells is the basis of the assay endpoint. Other normal properties demonstrated by these cells are keratin immunofluorescence patterns, ability to form cornified envelopes in response to Ca2+ and a lack of tumorigenicity. Both of the lines have high cloning efficiencies (up to 20%) and characteristic epidermal morphology. Their chromosome number, however, is near tetraploid. Dose response studies indicated an increase in colonies with altered response to Ca2+ proportional to the dose of three chemical carcinogens: DMBA 0.001-0.5 microgram/ml X 24 h, MCA 0.01-5 micrograms/ml X 24 h and MNNG 0.01-0.2 micrograms/ml X 1 h. The optimized assay protocol has provided a reproducible means of quantitating carcinogen-altered epidermal cells relative to carcinogen dose, and of isolating cell clones for studies of altered differentiation in carcinogenesis and chemotherapy.
journal_name
Carcinogenesisjournal_title
Carcinogenesisauthors
Kulesz-Martin M,Yoshida MA,Prestine L,Yuspa SH,Bertram JSdoi
10.1093/carcin/6.9.1245subject
Has Abstractpub_date
1985-09-01 00:00:00pages
1245-54issue
9eissn
0143-3334issn
1460-2180journal_volume
6pub_type
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