| pubmed-article:2998356 | pubmed:abstractText | Two established human tumor cell lines, epidermoid carcinoma line A431 and glioblastoma line SF268, were studied to compare the interaction of each with epidermal growth factor (EGF). SF268 cells bound [125I] EGF with 35-40 fold higher affinity than did the A431 cells. The EGF binding sites of both lines were photoaffinity labeled using 2,4-NAPS-[125I] EGF, a photoreactive derivative of EGF. Extracts of photolysed cells analyzed by SDS-PAGE showed a difference between the two cell lines in the high molecular weight component corresponding to the EGF receptor. EGF in a dose range from 0.3-200 nM had no effect on thymidine incorporation by SF268 cells, whereas thymidine incorporation by A431 cells was markedly inhibited by EGF. | lld:pubmed |
