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Does myeloma secrete an osteoblast inhibiting factor?
C E Evans1, C S Galasko, C Ward
1Hope Hospital, Manchester, England.
The Journal of Bone and Joint Surgery. British Volume
|March 1, 1989
Summary
Multiple myeloma tumors secrete a factor that inhibits bone-forming cells called osteoblasts. This finding helps explain myeloma-induced bone destruction and suggests a potential therapeutic target.
Area of Science:
- Oncology
- Bone Biology
- Cell Biology
Background:
- Multiple myeloma is characterized by bone destruction without the typical bone-building response.
- The mechanism behind this aberrant bone remodeling in myeloma is not fully understood.
Purpose of the Study:
- To investigate whether myeloma cells secrete a humoral factor that inhibits osteoblast activity.
- To characterize the nature of this potential osteoblast-inhibiting factor.
Main Methods:
- Human bone-derived cells were cultured with myeloma cells or in medium conditioned by myeloma cells.
- Osteoblast growth was assessed using cell counts and tritiated thymidine uptake (3H-Tdr).
Main Results:
- Culture medium conditioned by myeloma cells significantly inhibited bone-derived cell growth.
- Co-culture with myeloma cells also showed some inhibitory effects on bone-derived cells.
- The inhibition was dose-dependent and related to myeloma cell density.
Conclusions:
- Myeloma cells secrete an osteoblast-inhibiting factor.
- This factor has a molecular weight of less than 50,000 Daltons.
- This discovery provides insight into myeloma-associated bone pathology.