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Oestradiol enhances tumour regression induced by B7-I/IL-2 adenoviral gene transfer in a murine model of breast cancer
Linköping University, Faculty of Health Sciences. Linköping University, Department of Biomedicine and Surgery, Oncology. Östergötlands Läns Landsting, Centre of Surgery and Oncology, Department of Oncology UHL.
2003 (English)In: British Journal of Cancer, ISSN 0007-0920, Vol. 89, no 2, 385-390 p.Article in journal (Refereed) Published
Abstract [en]

The majority of breast cancers are oestrogen dependent and although current treatment strategies have improved, approximately 50% of the patients will develop metastasis. New treatments that result in long-term systemic immunity are therefore being developed. We have previously shown that adenoviral gene transfer of B7-I/IL-2 to murine breast cancer induces a high rate of complete turnout regression and systemic immunity. Since oestrogens not only affect breast cancer but also have been shown to modulate immune function and secretion of immune-regulatory cytokines, we explored whether administration of oestradiol altered the immune response induced by an adenoviral vector expressing B7-I/IL-2. An oestrogen-dependent murine breast cancer tumour was used in ovariectomised mice, supplemented either oestradiol or placebo. We report the somewhat unexpected finding that intratumoral injection of adenovirus expressing B7-I/IL-2 induces complete turnout regression in 76% of oestradiol-supplemented mice, while only 18% of the tumours regressed in the oestrogen-depleted group. Cured mice in both groups exhibited a similar CTL response against the tumour antigen. However, intratumoral IFN-? levels, 2 days after B7-I/IL-2 injection, were significantly higher in mice treated with oestradiol compared to placebo. This may be one mechanism explaining the higher response rate of tumours in oestradiol-replenished mice.

Place, publisher, year, edition, pages
2003. Vol. 89, no 2, 385-390 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-24981DOI: 10.1038/sj.bjc.6601099Local ID: 9394OAI: diva2:245305
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2011-01-13

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Dabrosin, Charlotta
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Faculty of Health SciencesOncologyDepartment of Oncology UHL
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