4.8 Review

Advancing CAR-based immunotherapies in solid tumors: CAR- macrophages and neutrophils

Journal

FRONTIERS IN IMMUNOLOGY
Volume 14, Issue -, Pages -

Publisher

FRONTIERS MEDIA SA
DOI: 10.3389/fimmu.2023.1291619

Keywords

CAR macrophages; CAR neutrophils; solid tumor; cancer immunotherapy; adoptive cell therapy

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This review outlines the important roles of macrophages and neutrophils in the tumor microenvironment and their potential in cancer immunotherapy. It focuses on CAR-engineered macrophages (CAR-Ms) and neutrophils (CAR-Ns), discussing their construction strategies, preclinical and clinical studies. The limitations, challenges, and future research directions of CAR-Ms and CAR-Ns are also briefly discussed.
Macrophages and neutrophils are the main components of the innate immune system and play important roles in promoting angiogenesis, extracellular matrix remodeling, cancer cell proliferation, and metastasis in the tumor microenvironment (TME). They can also be harnessed to mediate cytotoxic tumor killing effects and orchestrate effective anti-tumor immune responses with proper stimulation and modification. Therefore, macrophages and neutrophils have strong potential in cancer immunotherapy. In this review, we briefly outlined the applications of macrophages or neutrophils in adoptive cell therapies, and focused on chimeric antigen receptor (CAR)-engineered macrophages (CAR-Ms) and neutrophils (CAR-Ns). We summarized the construction strategies, the preclinical and clinical studies of CAR-Ms and CAR-Ns. In the end, we briefly discussed the limitations and challenges of CAR-Ms and CAR-Ns, as well as future research directions to extend their applications in treating solid tumors.

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