In Vivo MR Imaging of Tumor-Associated Macrophages: The Next Frontier in Cancer Imaging

Magnetic Resonance Insights
Runze YangJeff F Dunn

Abstract

There is a complex interaction between cancer and the immune system. Tumor-associated macrophages (TAMs) can be subverted by the cancer to adopt a pro-tumor phenotype to aid tumor growth. These anti-inflammatory, pro-tumor TAMs have been shown to contribute to a worsened outcome in several different types of cancer. Various strategies aimed at combating the pro-tumor TAMs have been developed. Several therapies, such as oncolytic viral therapy and high-intensity focused ultrasound, have been shown to stimulate TAMs and suppress tumor growth. Targeting TAMs is a promising way to combat cancer, but sensitive imaging methods that are capable of detecting these therapeutic responses are needed. A promising idea is to use imaging contrast agents to label TAMs to determine their relative number and location within, and around the tumor. This can provide information about the efficacy of TAM depletion therapies, as well as macrophage-stimulating therapies. In this review, we describe various in vivo MRI methods capable of tracking TAMs, and conclude with a short section on tracking TAMs in patients.

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Citations

Mar 7, 2020·Expert Opinion on Drug Discovery·Sahana KumarAshish Kulkarni
Mar 3, 2020·Frontiers in Medicine·Justine PerrinJacques Barbet
May 1, 2021·Biomedicines·Melanie A KimmMoritz Wildgruber
Aug 28, 2021·Nanomaterials·Rossella CanesePasquina Marzola

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Methods Mentioned

BETA
nuclear magnetic resonance
fluorescence microscopy
Fluorescence Lifetime Imaging Microscopy
transgenic
flow cytometry

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