Abstract
HER2-positive breast cancer (BC) is a rapidly growing and aggressive BC subtype that predominantly affects younger women. Despite improvements in patient outcomes with anti-HER2 therapy, primary and/or acquired resistance remain a major clinical challenge. Here, we sought to use a quantitative systems pharmacological (QSP) approach to evaluate the efficacy of lapatinib (LAP), abemaciclib (ABE) and 5-fluorouracil (5-FU) mono- and combination therapies in JIMT-1 cells, a HER2+ BC cell line exhibiting intrinsic resistance to trastuzumab. Concentration–response relationships and temporal profiles of cellular viability were assessed upon exposure to single agents and their combinations. To quantify the nature and intensity of drug-drug interactions, pharmacodynamic cellular response models were generated, to characterize single agent and combination time course data. Temporal changes in cell-cycle phase distributions, intracellular protein signaling, and JIMT-1 cellular viability were quantified, and a systems-based protein signaling network model was developed, integrating protein dynamics to drive the observed changes in cell viability. Global sensitivity analyses for each treatment arm were performed, to identify the most influential parameters governing cellular responses. Our QSP model was able to adequately characterize protein dynamic and cellular viability trends following single and combination drug exposure. Moreover, the model and subsequent sensitivity analyses suggest that the activation of the stress pathway, through pJNK, has the greatest impact over the observed declines of JIMT-1 cell viability in vitro. These findings suggest that dual HER2 and CDK 4/6 inhibition may be a promising novel treatment strategy for refractory HER2+ BC, however, proof-of-concept in vivo studies are needed to further evaluate the combined use of these therapies.
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The authors would like to thank Alexander Franco Anusha Ande and Brett Fleisher for technical assistance.
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Participated in research design: YLF, VR, TRV and SAO. Conducted experiments: YLF and LP. Contributed new reagents or analytic tools: YLF, VR, TRV, HM and SAO. Performed data analysis: YLF, VR, TRV, HM and SAO. Wrote or contributed to the writing of the manuscript: YLF, VR, TRV, HM and SAO.
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10928_2020_9732_MOESM1_ESM.tif
Supplementary file1 (TIF 44 KB) Supplementary Figure 1: Observations vs. individual prediction plot for estimation of 72-h time course interaction parameter (Ψ). The solid line represents the identity line, while the symbols represent observed data
10928_2020_9732_MOESM2_ESM.tif
Supplementary file2 (TIF 598 KB) Supplementary Figure 2: Concentration-effect surface plots for abemaciclib and 5-fluorouracil (A), abemaciclib and lapatinib (B), and lapatinib and 5-fluorouracil (C). The surface represents predicted cell viability assuming a psi of 1. Blue points below the simulated surface represent concentrations exhibiting additive to synergistic effects, while red points above the surface represent concentrations exhibiting antagonistic effects
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Franco, Y.L., Ramakrishnan, V., Vaidya, T.R. et al. A quantitative systems pharmacological approach identified activation of JNK signaling pathway as a promising treatment strategy for refractory HER2 positive breast cancer. J Pharmacokinet Pharmacodyn 48, 273–293 (2021). https://doi.org/10.1007/s10928-020-09732-x
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DOI: https://doi.org/10.1007/s10928-020-09732-x