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Cristina Muñoz-Pinedo

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    MA23 - Preclinical Models and Genetics of Malignant Pleural Mesothelioma (ID 353)

    • Event: WCLC 2019
    • Type: Mini Oral Session
    • Track: Mesothelioma
    • Presentations: 1
    • Now Available
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      MA23.02 - CDK4/6 Inhibitors Show Antitumor Effects in Preclinical Models of Malignant Pleural Mesothelioma (Now Available) (ID 1866)

      14:30 - 16:00  |  Author(s): Cristina Muñoz-Pinedo

      • Abstract
      • Presentation
      • Slides


      Novel therapeutic approaches are needed to improve the clinical outcome of patients with malignant pleural mesothelioma (MPM). In the current study, we investigate the antitumor activity of CDK4/6 inhibitors in preclinical models of MPM.


      MPM cell lines (H28, H226, H2052, H2452, MSTO-211H) and primary cultures (ICO_MPM1, ICO_MPM2, ICO_MPM3) were treated with abemaciclib or palbociclib for 24 and 72 hours. Cell viability was evaluated by cell counting and crystal violet assays. Cell death and cell cycle distribution were analyzed by flow cytometry and senescence was quantified by β-galactosidase expression. For transcriptomic studies, mRNA expression was assessed through RNA sequencing analysis. Gene set enrichment analysis (GSEA) was used to identify signaling pathways deregulated in MSTO-211H cells treated with CDK4/6 inhibitors. MSTO-211H cells were implanted subcutaneously in athymic mice that were randomly assigned to the following cohorts (n=7): i) vehicle; ii) cisplatin + pemetrexed; iii) palbociclib alone and iv) palbociclib + gemcitabine. Tumors’ size and mice weight was monitored during 4 weeks to evaluate efficacy.


      Treatment with abemaciclib or palbociclib at 100nM induced a significant decrease in cell proliferation (mean 50.9% ± 7.6; mean 47.3% ± 9.9, respectively) in distinct MPM cell models, including cells derived from patients who progressed to prior cisplatin and pemetrexed. Both CDK4/6 inhibitors induced G1-phase cell cycle arrest, while cell death was slightly affected (up to 1-5%). At concentrations ranging from 250 to 500nM, the percentage of senescent cells was increased after abemaciclib (15-26%) and palbociclib (18-25%) treatment in all the analyzed cell models. GSEA revealed that CDK4/6 inhibitors promote interferon signaling pathway and MHC presentation. In the in vivo experiment, a significant reduction in tumor growth was observed in response to palbociclib alone or combined with gemcitabine for 4 weeks (vehicle = 1335.8±586.4 mm3; cisplatin + pemetrexed= 726±573.5 mm3; palbociclib = 479±235.7 mm3; palbociclib + gemcitabine = 517±487.4 mm3; p< 0.05).


      CDK4/6 inhibitors reduce cell proliferation in culture models of MPM mainly by blocking cell proliferation at G1 and by inducing senescence. Palbociclib alone or combined with gemcitabine reduces in vivo tumor growth of subcutaneously implanted MSTO-211H cells compared to chemotherapy.

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