A two by six factorial design was used to investigate the effect of zinc and all-trans retinoic acid (RA) on the growth of two human breast cancer cell lines differing in their expression of metallothionein (MT) and of estrogen receptors; MCF7 cells express estrogen receptors, BT-20 cells do not. Cells were treated with zinc to induce MT then treated with six concentrations of RA. Cell proliferation, lipid peroxidation, MT protein, MT mRNA and glutathione concentrations were measured. / BT-20 cells expressed higher constitutive MT concentrations than MCF7 cells. MT was significantly induced by zinc treatment in BT-20 cells but not in MCF7 cells. Low RA concentrations stimulated growth proliferation but higher concentrations inhibited cell proliferation. High RA concentrations increased lipid peroxidation. There was a significant negative correlation between lipid peroxidation and cell proliferation. Growth inhibition and lipid peroxidation were reduced by zinc in BT-20 cells but not in MCF7 cells. Glutathione did not appear to be a significant factor. / Induction of metallothionein by zinc may modulate the growth inhibitory effects of all-trans retinoic acid in human breast cancer cells. One mechanism of growth inhibition may be through increased lipid peroxidation.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.27345 |
| Date | January 1996 |
| Creators | Hurnanen, Darin. |
| Contributors | Chan, Laurie (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science (School of Dietetics and Human Nutrition.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001554269, proquestno: MQ29720, Theses scanned by UMI/ProQuest. |
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