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Growth regulation of human prostate cancer cells by bone morphogenetic protein-2
H Ide1, T Yoshida, N Matsumoto
1Genetics Division, National Cancer Center Research Institute, Tokyo, Japan.
Abstract:
Bone morphogenetic proteins (BMPs) belong to the transforming growth factor-beta (TGF-beta) family and have been identified as factors that stimulate bone formation in vivo. They turned out to be multifunctional molecules regulating the growth, differentiation, and apoptosis in various target cells. Some BMPs and their receptors (BMPRs) are expressed on prostate cancer cells. We have reported previously that BMPR-IB mRNA expression is highest in the prostate, a characteristic that is not shared by the other BMPRs, BMPR-IA and BMPR-II. However, the amounts of BMPR-IB mRNA were significantly low in prostate tissues after androgen withdrawal therapy. They were also low in prostate cancer cell lines. Semiquantitative RT-PCR showed that BMPR-IB mRNA was induced by androgen in the androgen-sensitive human prostatic cancer cell line LNCaP, whereas the expression of BMPR-IA and BMPR-II mRNAs was not affected by androgen. When the recombinant human BMP-2 was added to the LNCaP cells in the presence of androgen, cell growth was inhibited. In contrast, the growth rate was increased by the addition of the same ligand when the cells were cultured in the absence of androgen; under this condition, the amounts of BMPR-IB mRNA were decreased significantly. These observations showed that the amounts of BMPR-IB, but not those of BMPR-IA, were regulated by androgen and further suggest that BMPR-IA and BMPR-IB differentially modulate prostate cancer cell growth in response to BMP under different hormonal conditions; BMPR-IA elicits growth stimulation, and BMPR-IB conveys a negative regulatory signal in response to BMP-2.
Insights
Androgen regulates bone morphogenetic protein receptor-IB (BMPR-IB) expression in prostate cancer cells. BMPR-IB levels influence cell growth differently based on androgen presence, impacting prostate cancer progression.
Area of Science:
- Molecular Biology
- Cancer Research
- Endocrinology
Background:
- Bone morphogenetic proteins (BMPs) are key regulators of cell growth and differentiation.
- BMPs and their receptors (BMPRs) are implicated in prostate cancer biology.
- BMPR-IB mRNA expression is notably high in prostate tissues but decreases with androgen withdrawal.
Purpose of the Study:
- To investigate the role of androgen in regulating BMPR-IB expression in prostate cancer.
- To determine how BMPR-IA and BMPR-IB differentially affect prostate cancer cell growth under varying hormonal conditions.
Main Methods:
- Semiquantitative reverse transcription-polymerase chain reaction (RT-PCR) was used to analyze BMPR mRNA expression.
- Androgen-sensitive human prostate cancer cell line (LNCaP) was cultured with and without androgen.
- Recombinant human BMP-2 was added to assess its effect on cell growth and BMPR expression.
Main Results:
- Androgen significantly induced BMPR-IB mRNA expression in LNCaP cells, while BMPR-IA and BMPR-II were unaffected.
- BMP-2 inhibited cell growth in the presence of androgen but stimulated it in its absence.
- BMPR-IB mRNA levels decreased significantly when cells were cultured without androgen.
Conclusions:
- Androgen differentially regulates BMPR-IB expression, impacting prostate cancer cell behavior.
- BMPR-IA and BMPR-IB play distinct roles in modulating prostate cancer cell growth based on hormonal status.
- BMPR-IA promotes growth stimulation, while BMPR-IB mediates negative regulation in response to BMP-2.