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Pim2 is important for regulating DNA damage response in multiple myeloma cells

J Ramachandran1, L Santo1, K T Siu1

  • 1Massachusetts General Hospital Cancer Center, MGH Cancer Center, Harvard Medical School, Boston, MA, USA.

Blood Cancer Journal
|August 27, 2016
PubMed

Insights

Pan proviral integration (PIM) inhibition shows promise for treating multiple myeloma (MM). Pim2 kinase plays a key role in MM cell death and regulates the DNA damage response, offering new therapeutic strategies.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Therapeutics

Background:

  • Pan proviral integrations of Moloney virus (PIM) kinases are implicated in multiple myeloma (MM) pathogenesis.
  • PIM kinase inhibitors are under clinical investigation for MM treatment.
  • The specific roles of individual PIM kinases in MM remain to be fully elucidated.

Purpose of the Study:

  • To investigate the role of different PIM kinases in multiple myeloma.
  • To determine the specific contribution of Pim2 to MM cell viability and therapeutic response.
  • To explore the novel function of Pim2 in the DNA damage response (DDR) pathway.

Main Methods:

  • Utilized human-derived MM cell lines for in vitro studies.
  • Employed xenograft mouse models to assess tumor burden reduction.
  • Performed gene knockdown and overexpression experiments for Pim2.
  • Analyzed downstream markers of the DNA damage response.
  • Investigated the effect of doxorubicin (Dox) treatment on Pim2 levels and MM cell survival.

Main Results:

  • Pim2 was identified as a significant contributor to MM cell cytotoxicity.
  • Pim2 knockdown upregulated key DNA damage response (DDR) markers, mimicking doxorubicin effects.
  • Doxorubicin treatment led to decreased Pim2 levels, indicating its position downstream of DNA damage.
  • Pim2 overexpression provided a survival advantage against doxorubicin via antiapoptotic activity.

Conclusions:

  • Pim2 plays a critical role in multiple myeloma cell cytotoxicity and survival.
  • Pim2 acts as a negative regulator of the DNA damage response pathway in MM.
  • These findings reveal a novel mechanism of PIM kinase activity and suggest Pim2 as a therapeutic target for MM.

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