Case Report

International Journal of Hematology

, 75:534

First online:

Synergistic Growth Inhibition of YM529 with Biologic Response Modifiers (BRMs) in Myeloma Cells

  • Kenichiro YataAffiliated withDivision of Hematology, Department of Internal Medicine, Kawasaki Medical School Email author 
  • , Takemi OtsukiAffiliated withDepartment of Hygiene, Kawasaki Medical School
  • , Osamu YamadaAffiliated withDivision of Hematology, Department of Internal Medicine, Kawasaki Medical School
  • , Hideho WadaAffiliated withDivision of Hematology, Department of Internal Medicine, Kawasaki Medical School
  • , Yoshihito YawataAffiliated withDepartment of Care Work, Kawasaki College of Allied Health Professions
  • , Takashi SugiharaAffiliated withDivision of Hematology, Department of Internal Medicine, Kawasaki Medical School

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Abstract

Bisphosphonates (BPs) are effective in the management of bone disease in patients with multiple myeloma. Recent reports have suggested that they may also have an antitumor activity. YM529 is a new synthetic BP with more than 1000 times the bone resorption inhibitory activity of pamidronate. To clarify the direct effects of YM529 on myeloma cells, the cell proliferation and cell cycle perturbation were analyzed using 12 myeloma cell lines established in our laboratory. The growth inhibition was dose dependent. The cells accumulated in [2n≪4n] of the cell cycle and subsequently formed an apoptotic sub-G1 fraction. Combined treatment with all-trans retinoic acid, thalidomide, or interferon-α enhanced the growth inhibitory effects of YM529 on these cells. However, there were no remarkable effects of YM529 on the messenger RNA expression for angiogenic factors, cell cycle regulators, or cytokines related to myeloma cells. These results indicate that YM529 is beneficial not only to bone lesions but also for its direct antitumor effects on myeloma cells.

Key words

Myeloma Bisphosphonate YM529 Cell line