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Multiple myeloma cells directly stimulate bone resorption in vitro by down-regulating mature osteoclast apoptosis

Iman El Hajj Dib1, Iman El Hajj Dib, Mélanie Gressier

  • 1Laboratoire de Biologie et Pharmacie Clinique, UPRES-EA 2086 Université de Picardie Jules Verne, Amiens Cedex, France.

Leukemia Research
|February 20, 2008
PubMed

Insights

Multiple myeloma cells can inhibit osteoclast apoptosis, increasing bone resorption. This effect is mediated by M-CSF, a factor secreted by certain myeloma cells, highlighting a new mechanism in multiple myeloma bone disease.

Area of Science:

  • Oncology
  • Cell Biology
  • Bone Biology

Background:

  • Multiple myeloma (MM) causes significant bone destruction, primarily through increased osteoclast formation.
  • The direct impact of multiple myeloma cells on osteoclast survival (apoptosis) remains largely unexplored.

Purpose of the Study:

  • To investigate whether multiple myeloma cells can directly influence osteoclast apoptosis.
  • To identify the mechanisms by which multiple myeloma cells might affect osteoclast survival and bone resorption.

Main Methods:

  • Utilized conditioned media (CM) from various multiple myeloma cell lines (U266, RPMI8226, LP-1, OPM-2).
  • Assessed effects on mature rabbit osteoclast apoptosis and bone resorption.
  • Investigated the role of M-CSF and its receptor using neutralizing antibodies and imatinib mesylate.

Main Results:

  • CM from U266 and RPMI8226 cells stimulated bone resorption and inhibited osteoclast apoptosis.
  • This anti-apoptotic effect correlated with high M-CSF secretion by these MM cells.
  • Neutralizing M-CSF or inhibiting its receptor with imatinib mesylate reversed the observed effects.

Conclusions:

  • Multiple myeloma cells can directly decrease osteoclast apoptosis, contributing to bone disease.
  • Macrophage colony-stimulating factor (M-CSF) secreted by myeloma cells is a key mediator of this effect.
  • Targeting M-CSF signaling presents a potential therapeutic strategy for multiple myeloma bone complications.

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