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Bone morphogenetic protein-5, -6 and -7 inhibit growth and induce apoptosis in human myeloma cells
Torstein Baade Ro1, Randi Utne Holt, Anne-Tove Brenne
1Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, Trondheim N-7489, Norway. torstein.ro@medisin.ntnu.no
Abstract:
Previously, bone morphogenetic protein (BMP)-2 and -4 have been shown to inhibit proliferation and induce apoptosis in human myeloma cells. BMP-2 and -4 belong to a subgroup of BMPs using the BMP receptors Alk-3 or -6. In this study, we examined the effects on human myeloma cells of BMP-6 and -7, members of a different BMP subgroup, which mainly utilize Alk-2 as their receptor. All cell lines examined expressed mRNA for the BMP-6 and -7 receptor Alk-2. We did not detect transcripts for the BMP-2 and -4 receptors Alk-3 or Alk-6 in INA-6 and RPMI-8226 cells by RT-PCR. Accordingly, the intracellular signalling molecules Smad-1, -5 and -8 were not phosphorylated by BMP-4 in INA-6 and RPMI-8226 cells. The expression patterns of various BMP receptors in the myeloma cell lines explained the differences in responses to the various BMPs. Alk-2-expressing cell lines responded with growth inhibition and apoptosis to BMP-6 and -7, whereas cell lines lacking both Alk-3 and -6 were resistant to BMP-4. Soluble Alk-3 and -6 were able to neutralize the BMP-4 effects in BMP-4-responsive cell lines. All BMPs reduced viability in more than 70% of purified primary myeloma cell samples. BMPs have intriguing antitumor effects in vitro. Importantly, myeloma cells not responsive to BMP-2 and -4 may still be sensitive to BMP-6 or -7. It is possible that therapeutic use of BMP or BMP analogues could have an impact on both myeloma bone disease and myeloma cell growth.
Insights
Bone morphogenetic proteins (BMPs) show potential against human myeloma. BMP-6 and -7 effectively inhibit myeloma cell growth and induce apoptosis, offering new therapeutic avenues.
Area of Science:
- Biochemistry
- Molecular Biology
- Oncology
Background:
- Bone morphogenetic proteins (BMPs) are signaling molecules with known roles in bone formation and repair.
- Previous studies indicated BMP-2 and BMP-4 inhibit human myeloma cell proliferation and induce apoptosis.
- BMP-2 and -4 primarily signal through BMP receptors Alk-3 or -6.
Purpose of the Study:
- To investigate the effects of BMP-6 and BMP-7 on human myeloma cells.
- To determine the role of specific BMP receptor expression in myeloma cell response to different BMPs.
Main Methods:
- Reverse transcription polymerase chain reaction (RT-PCR) to detect BMP receptor mRNA expression in myeloma cell lines.
- Treatment of myeloma cell lines and primary myeloma cells with BMP-6, BMP-7, and BMP-4.
- Analysis of cell proliferation, apoptosis, and intracellular signaling molecule phosphorylation (Smad-1, -5, -8).
Main Results:
- All examined myeloma cell lines expressed the Alk-2 receptor, the primary receptor for BMP-6 and -7.
- Myeloma cell lines expressing Alk-2 showed growth inhibition and apoptosis in response to BMP-6 and BMP-7.
- Cell lines lacking Alk-3 and Alk-6 receptors were resistant to BMP-4, while soluble Alk-3 and -6 neutralized BMP-4 effects.
- BMPs reduced viability in over 70% of primary myeloma cell samples.
Conclusions:
- Myeloma cell response to BMPs is dependent on the expression of specific BMP receptors.
- BMP-6 and BMP-7 demonstrate significant antitumor effects in human myeloma cells, independent of BMP-2/-4 sensitivity.
- BMPs represent a promising therapeutic strategy for managing myeloma bone disease and controlling myeloma cell growth.
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