Vrije Universiteit Brussel

 

Publications on Multiple Myeloma

Inhibiting Dickkopf-1 (Dkk1) Removes Suppression of Bone Formation and Prevents the Development of Osteolytic Bone Disease in Multiple Myeloma
  • Inhibiting Dickkopf-1 (Dkk1) Removes Suppression of Bone Formation and Prevents the Development of Osteolytic Bone Disease in Multiple Myeloma.

    Heath DJ, Chantry AD, Buckle CH, Coulton L, Shaughnessy JD, Evans HR, Snowden JA, Stover DR, Vanderkerken K, Croucher PI.

    J Bone Miner Res 24 (3), 425-36, 2009.

    Abstract:
    Multiple myeloma (MM) is associated with the development of osteolytic bone disease, mediated by increased osteoclastic bone resorption and impaired osteoblastic bone formation. Dickkopf-1 (Dkk1), a soluble inhibitor of wingless/int (Wnt) signaling and osteoblastogenesis, is elevated in patients with MM and correlates with osteolytic bone disease. In this study, we investigated the effect of inhibiting Dkk1, on the development of osteolytic lesions in the 5T2MM murine model of myeloma. We demonstrated that Dkk1 is expressed by murine 5T2MM myeloma cells. Injection of 5T2MM cells into C57BL/KaLwRij mice resulted in the development of osteolytic bone lesions (p<0.05), mediated by increased osteoclast numbers (p<0.001) and a decrease in osteoblast numbers (p<0.001) and mineralising surface (p<0.05). Mice bearing 5T2MM cells were treated with an anti-Dkk1 antibody (BHQ880, 10mg/Kg, i.v. twice weekly for four weeks) from time of paraprotein detection. Anti-Dkk1 treatment prevented 5T2MM-induced suppression of osteoblast numbers (p<0.001) and surface (p<0.001). Treatment increased mineralising surface by 28% and bone formation rate by 25%; however, there was no change in mineral apposition rate. Inhibiting Dkk1 had no effect on osteoclast numbers. MicroCT analysis demonstrated that anti-Dkk1 treatment significantly protected against 5T2MM induced trabecular bone loss (p<0.05) and reduced the development of osteolytic bone lesions (p<0.05). Treatment had no significant effect on tumour burden. These data suggest that inhibiting Dkk1 prevents the suppression of bone formation and in doing so is effective in preventing the development of osteolytic bone disease in myeloma, offering an effective therapeutic approach to treating this clinically important aspect of myeloma.

 

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