Abstract
The cell-surface proteins of 6 different melanoma cell cultures have been labelled with 125I using lactaperoxidase-catalysed iodination. Fractionation of the proteins was achieved using 5--22.5% polacrylamide-gradient gel electrophoresis in the presence of sodium dodecyl sulphate (SDS) and the proteins were detected by autoradiography. Up to 24 labelled proteins were detected in the individual cell cultures, but the proteins labelled differed considerably in the 6 cultures examined. A possible reason for this, involving variation in the glycosylation of cell-surface glycoproteins is discussed. Cells of the same melanoma line had similar cell-surface proteins at different passage levels, but changes in the labelled proteins occurred when the culture conditions were altered. The cell-surface proteins of high molecular weight were cleaved by trypsin, but most of the low mol.-wt. proteins were resistant to trypsin. The "large external transformation sensitive" (LETS) protein detected as a major protein on fibroblasts in culture was not a dominant protein on the melanoma cells. It was detected on only 4/6 cell cultures. Possible relationships of the cell-surface proteins described in this study to morphology, immunological properties and proteolytic activity of human melanoma cells are discussed.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 24 print issues and online access
$259.00 per year
only $10.79 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
Rights and permissions
About this article
Cite this article
Roberts, G. Lactoperoxidase-catalysed iodination of surface proteins on human melanoma cells. Br J Cancer 38, 114–121 (1978). https://doi.org/10.1038/bjc.1978.170
Issue Date:
DOI: https://doi.org/10.1038/bjc.1978.170
This article is cited by
-
Differences in surface sialic acid and galactosyl residues of two autologous human melanoma cell lines
Medical Oncology and Tumor Pharmacotherapy (1984)
-
Procollagen localisation in normal, premalignant and malignant lesions of the epidermis
Archives of Dermatological Research (1982)