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Steroidal regulation of cell cycle progression
R L Sutherland1, J A Hamilton, K J Sweeney
1Cancer Biology Division, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, Sydney, NSW, Australia.
Ciba Foundation Symposium
|January 1, 1995
Summary
Sex steroids regulate cell cycle progression in breast cancer by controlling cyclin D1 expression. This key protein
Area of Science:
- Molecular Biology
- Cell Biology
- Endocrinology
Background:
- Sex steroid hormones and antagonists impact cell proliferation in cancer.
- Cell cycle progression is regulated by specific genes and proteins.
- Cyclin D1 is a key regulator in the cell cycle.
Purpose of the Study:
- To investigate the role of cyclin D1 in human breast cancer cell cycle control.
- To determine how sex steroids and their antagonists influence cyclin D1 expression.
- To understand the impact of cyclin D1 on cell cycle progression.
Main Methods:
- Studied human breast cancer cells.
- Analyzed cell cycle progression.
- Measured cyclin D1 gene expression.
- Investigated responses to oestrogens, progestins, and anti-oestrogens.
Main Results:
- Cyclin D1 induction is an early response to oestrogen and progestin stimulation.
- Cyclin D1 expression is rate-limiting for G1 phase progression.
- Inhibition of cyclin D1 expression occurs with anti-oestrogen treatment.
- Cyclin D1 is sufficient for cell cycle completion in G1-arrested cells.
Conclusions:
- Cyclin D1 is a critical mediator of sex steroid hormone action on breast cancer cell cycle progression.
- Targeting cyclin D1 may offer therapeutic strategies for hormone-dependent breast cancers.
- Sex steroids and antagonists modulate breast cancer cell growth via cyclin D1 regulation.