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Published on: January 31, 2012
Effects induced by BMPS in cultures of human articular chondrocytes: comparative studies
Susan Chubinskaya1, Diane Segalite, Dmitriy Pikovsky
1Department of Biochemistry, Rush University Medical Center, Chicago, IL 60612, USA. schubins@rush.edu
Abstract:
We compared anabolic and anti-catabolic activities of selected bone morphogenetic proteins (BMP-2, -4, -6, and -7) and cartilage-derived morphogenetic proteins (CDMP-1 and -2) in human normal adult articular chondrocytes. Ankle chondrocytes were cultured in alginate beads in the presence of 10% serum and treated with either growth factors only (each at 100 ng/ml) or the combination of interleukin-1 (IL-1 beta) (0.1 ng/ml) and BMPs. Chondrocyte metabolism was assessed by proteoglycan (PG) synthesis, content, DNA content, and cell survival. The results showed that BMP-2, -4, and -7 were more potent in stimulating PGs than other growth factors tested. The highest levels of PG synthesis were detected at day 9 in the presence of BMP-7. With regard to anti-catabolic properties, the effect depended upon treatment scheme (simultaneous or sequential). Under simultaneous cultures, BMP-2, -4, and -6 failed to counteract IL-1 beta induced inhibition of PG synthesis, while the CDMPs restored this parameter to serum control levels. Only BMP-7 showed consistent and pronounced anti-catabolic activity in either culture treatment scheme. None of the factors induced cell death or chondrocyte proliferation. In conclusion, the growth factors tested showed different levels of effects on human chondrocytes in culture, but only BMP-7 displayed both strong anabolic and anti-catabolic properties.
Insights
Bone morphogenetic proteins (BMPs) and cartilage-derived morphogenetic proteins (CDMPs) were tested on human chondrocytes. BMP-7 demonstrated both strong anabolic and anti-catabolic properties, making it a promising factor for cartilage repair.
Area of Science:
- Biochemistry
- Cell Biology
- Regenerative Medicine
Background:
- Articular chondrocytes are crucial for joint health.
- Bone morphogenetic proteins (BMPs) and cartilage-derived morphogenetic proteins (CDMPs) are investigated for their roles in cartilage homeostasis.
- Understanding their anabolic and anti-catabolic effects is key for developing cartilage repair strategies.
Purpose of the Study:
- To compare the anabolic and anti-catabolic activities of specific BMPs (BMP-2, -4, -6, -7) and CDMPs (CDMP-1, -2) in human normal adult articular chondrocytes.
- To evaluate the potential of these growth factors in stimulating proteoglycan synthesis and counteracting interleukin-1 beta (IL-1 beta)-induced catabolism.
Main Methods:
- Human ankle chondrocytes were cultured in alginate beads with serum.
- Cells were treated with individual growth factors or a combination of IL-1 beta and BMPs.
- Chondrocyte metabolism was assessed via proteoglycan (PG) synthesis and content, DNA content, and cell survival.
Main Results:
- BMP-2, BMP-4, and BMP-7 significantly stimulated PG synthesis, with BMP-7 showing the highest levels at day 9.
- BMP-7 exhibited consistent and potent anti-catabolic activity against IL-1 beta, restoring PG synthesis.
- CDMP-1 and CDMP-2 also restored PG synthesis to control levels under simultaneous treatment but lacked consistent anti-catabolic effects in sequential treatments.
Conclusions:
- BMP-7 possesses both strong anabolic and significant anti-catabolic properties in human articular chondrocytes.
- While other BMPs and CDMPs show anabolic potential, BMP-7 is unique in its dual action, suggesting its therapeutic value for cartilage regeneration.
- None of the tested factors induced chondrocyte death or proliferation, indicating a favorable safety profile in vitro.
