Abstract
The more differentiated components of a primary tumor may produce substances that reduce the growth rate and metastatic potential of more aggressive components. In the Dunning R-3327 prostatic adenocarcinoma model, cancer cell motility is required for metastatic potential. Medium conditioned by the non-motile, non-metastatic G subline contains proteins of molecular weight 50–100 kDa that inhibited the motility of the highly motile, highly metastatic MAT-LyLu subline. G subline-conditioned medium was separated by DEAE-cellulose chromatography using a linear gradient of 0–0.5 spm NaCl in 100 mspm Tris at pH 8.3. The motility inhibitory activity of G-conditioned medium was localized to column fractions 51–70 that contained 18% of the applied protein and only 6.5% of the proteins secreted by the G cells. Analysis of pooled fractions 51–00 and 61–70 by two-dimensional gel electrophoresis identified five protein families, with a total of 12 charged proteins of molecular weights approximating 66, 54, 50, 41 and 34 kDa, that were not present or present in reduced quantities in column fractions that did not inhibit motility. Isolation and identification of motility inhibitory protein may prove it the first substance discovered that is produced by a more differentiated component of a neoplasm that directly inhibits a metastasis-associated property.
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Mohler, J.L., Bakewell, W.E., Sharief, Y. et al. Detection of candidates for cancer cell motility inhibitory protein in the Dunning adenocarcinoma model. Clin Exp Metast 13, 474–480 (1995). https://doi.org/10.1007/BF00118186
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DOI: https://doi.org/10.1007/BF00118186