Summary
It was recently reported (Endoh et al. 1981, Exp Cell Biol 49:272–277) that conditioned medium of neonatal mouse brain (CM-NB) inhibited the growth of mouse neuroblastoma cells. In this work we fractionated CM-NB by size exclusion high performance liquid chromatography, and separated two active principles (28,000 and 62,000 daltons) Each or a combination of the 28,000 and 62,000 dalton fractions showed a differential inhibitory effect on DNA synthesis or clonal growth of the three human lung cell lines: the normal diploid fibroblast WI38 cells were less susceptible than their simian virus 40-transformed VA13 cells and carcinoma A549 cells. This preferential growth-inhibition of malignant cells was also observed for rat fibroblast 3Y1 and its simian virus 40-transformed W3Y cells, and for two other normal and five other malignant cell lines. The growth-inhibitory activity of CM-NB or the 28,000 and 62,000 dalton fractions was lost by pronase, trypsin, tetrahydrofuran, acetonitrile, or dithiothreitol in the presence of guanidine, and also labile to heat, vigorous agitation, or freeze-thawing. The activity was also found in the conditioned medium of prenatal mouse brain, but not in either the conditioned medium of the adult brain and of the secondary culture of the neonatal brain, or in the homogenate and rinsing fluid of the neonatal brain. Thus the mouse brain at the terminal stage of ontogenesis liberates proteinaceous factors, which exhibit a preferential growth-inhibition of tumor or transformed cells and act on malignant cells of human and rodent origin.
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Abbreviations
- CM-NB:
-
the conditioned medium of the neonatal mouse brain
- NBCF:
-
neonatal mouse brain-derived carcinostatic factor
- Hepes:
-
4-(2-hydroxymethyl)-1-piperazine-ethanesulfonic acid
- MEM-H:
-
Eagle's minimum essential medium/10 mM Hepes
- MEM-HF:
-
MEM-H supplemented with 10% fetal calf serum
- HPLC:
-
high performance liquid chromatography
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This work was supported in part by a Research Grant from the Ministry of Education, Science and Culture, Japan
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Miwa, N., Mizuno, S. Inhibition of tumor cell growth by protein factors derived from the developing mouse brain. J Cancer Res Clin Oncol 110, 196–202 (1985). https://doi.org/10.1007/BF00399273
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DOI: https://doi.org/10.1007/BF00399273