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Integrating Mathematical Modeling with High-Throughput Imaging Explains How Polyploid Populations Behave in
Gregory J Kimmel1, Mark Dane2, Laura M Heiser1,2
1Department of Integrated Mathematical Oncology, Moffitt Cancer Center, Tampa, Florida.
Cancer Research
|September 17, 2020
Summary
Nutrient-deprived breast cancer cells invade aggressively. Heterogeneous cell populations invade faster if phenotypes are imbalanced, but slower if balanced, suggesting ploidy can guide combination therapies.
Area of Science:
- Oncology
- Mathematical Biology
- Cancer Cell Biology
Background:
- Breast cancer invasion is a multistep process involving primary tumor growth, stroma invasion, and metastasis.
- Nutrient-limiting conditions promote aggressive cell morphologies and chemotaxis, driving invasion.
- The differential response of coexisting cancer cell subpopulations to nutrient limitations and its impact on collective invasion remain unclear.
Purpose of the Study:
- To investigate cancer cell invasion dynamics in nutrient-limiting environments using homogeneous and heterogeneous cell populations.
- To explore how variations in energy efficiency and chemotactic ability among subpopulations influence metapopulation invasion.
- To identify potential biomarkers and therapeutic strategies for modulating invasion based on phenotypic heterogeneity.
Main Methods:
- Integration of mathematical modeling with experimental data from microenvironmental perturbations.
- Simulation of invasion dynamics for homogeneous and heterogeneous cancer cell populations with defined phenotypes.
- Analysis of spatial segregation and competition between subpopulations based on nutrient efficacy and chemotaxis.
Main Results:
- Invasion distance is influenced by the balance between nutrient efficacy and chemotactic superiority in heterogeneous populations.
- Imbalanced phenotypes lead to spatial segregation, with one subpopulation dominating the invasion front.
- Balanced phenotypes result in competition between subpopulations, decelerating overall invasion.
- Ploidy is investigated as a potential biomarker for phenotypic heterogeneity.
Conclusions:
- Phenotypic heterogeneity in cancer cell subpopulations significantly impacts invasion dynamics.
- An imbalance in phenotypic traits accelerates invasion, while balance decelerates it.
- Ploidy may serve as a biomarker to personalize combination therapies, including cytotoxic drugs and mTOR inhibitors (mTOR-I), by optimizing drug dosage to promote beneficial subpopulation competition.
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