Abstract
KB cell strains which are resistant to the lethal effects of diphtheria toxin were isolated from the toxin-sensitive KB cell line. For one such strain, KB-R2, the concentration of diphtheria toxin required to cause a 50% reduction of incorporation of amino acids into protein was more than 2,000 times that required in the sensitive KB-S cell. The KB-R2 strain was cloned by a single-cell isolation method to yield uniform strains with an even greater resistance to toxin. Resistance is a stable, inheritable property, providing a good genetic marker, and appears to be related to some alteration in the cell membrane. Preliminary studies showed that these cell strains are resistant to poliovirus and vesicular stomatitis virus as well as to toxin.
MeSH Terms
Amino Acids/metabolism
Carbon Isotopes
Carcinoma
Cell Line
Cell-Free System
Clone Cells
Diphtheria Toxin/isolation & purification,pharmacology,toxicity
Drug Resistance
Humans
Immunity
Mouth Neoplasms
RNA Viruses
Time Factors
Valine/metabolism
Chemicals
Amino Acids
Carbon Isotopes
Diphtheria Toxin
Valine
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Moehring T J
Moehring J M
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18 references, click to expand
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