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Tumor suppression involves down-regulation of interleukin 3 expression in hybrids between autocrine mastocytoma and interleukin 3-dependent parental mast cells

Diamantis, I. D. and Nair, A. P. and Hirsch, H. H. and Moroni, C.. (1989) Tumor suppression involves down-regulation of interleukin 3 expression in hybrids between autocrine mastocytoma and interleukin 3-dependent parental mast cells. Proceedings of the National Academy of Sciences of the United States of America, Vol. 86, H. 23. pp. 9299-9302.

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Official URL: http://edoc.unibas.ch/dok/A5257905

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Abstract

Interleukin 3 (IL-3)-dependent PB-3c mouse mastocytes can be transformed by the v-Ha-ras oncogene to generate autocrine IL-3-producing mastocytomas. Hybrid cell lines were constructed by fusing an IL-3-producing mastocytoma cell line with its IL-3-dependent normal parental cell. Unlike the mastocytoma parent cell line, hybrid cell lines required growth factor for in vitro proliferation, indicating that the IL-3-dependent phenotype is dominant. IL-3 mRNA, expressed at high levels in the tumor cells, appeared down-regulated in the cell hybrids. In contrast, p21v-Ha-ras levels were not reduced in the hybrids. The hybrid lines generated tumors in vivo with drastically prolonged latency times when compared to the tumor parent (10 versus 2 weeks). We propose that down-regulation of IL-3 mRNA production after cell fusion is responsible for the loss of growth autonomy in the hybrids and is likely to play a role in the partial suppression of tumor formation in vivo. Our data are consistent with the hypothesis that a tumor suppressor, present in PB-3c cells, acts as a negative regulator of IL-3 expression.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Growth and Development (Moroni)
03 Faculty of Medicine > Departement Biomedizin > Former Units at DBM > Growth and Development (Moroni)
UniBasel Contributors:Moroni, Christoph
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:National Academy of Sciences
ISSN:0027-8424
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:22 Mar 2012 14:20
Deposited On:22 Mar 2012 13:19

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