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Modulating Repolarization of Tumor-Associated Macrophages with Targeted Therapeutic Nanoparticles as a Potential

Xiaojie Lin1, Yan Fang1, Xuechao Jin1

  • 1Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, Liaoning 117004, P. R. China.

ACS Applied Bio Materials
|January 10, 2022
PubMed

Insights

Nanoparticles can reprogram tumor-associated macrophages (TAMs) to enhance cancer immunotherapy. This approach targets M2 macrophages, reducing immunosuppression within the tumor microenvironment (TME) for better treatment outcomes.

Area of Science:

  • Immunology
  • Nanotechnology
  • Oncology

Background:

  • Tumor-associated macrophages (TAMs) in the tumor microenvironment (TME) promote immune evasion, leading to tumor growth and therapeutic resistance.
  • Macrophages exhibit plasticity, differentiating into M1 (inflammatory) and M2 (regulatory) phenotypes, influencing immune responses.
  • Understanding macrophage polarization is crucial for developing effective cancer immunotherapies.

Purpose of the Study:

  • To review the application of nanopreparations in macrophage-centered immunotherapy.
  • To explore how nanotherapeutics can modulate TAM phenotypes and functions within the TME.
  • To provide insights into targeting macrophage plasticity for cancer treatment.

Main Methods:

  • Review of literature on macrophage biology, TME components, and nanoparticle-based drug delivery.
  • Analysis of signaling pathways regulating macrophage polarization (M1/M2).
  • Evaluation of nanotherapeutics designed to attenuate M2 macrophages and reduce TME immunosuppression.

Main Results:

  • Nanopreparations can be engineered to target and re-educate TAMs, shifting their phenotype from immunosuppressive M2 to anti-tumorigenic states.
  • Targeted nanoparticles can reduce M2 macrophage aggregation in the TME, thereby alleviating immunosuppression.
  • Detailed mechanisms of key signaling pathways governing macrophage plasticity and polarization are elucidated.

Conclusions:

  • Macrophage-targeted nanopreparations offer a promising strategy for cancer immunotherapy by modulating the TME.
  • Nanotherapeutics can overcome challenges associated with TAM-driven immunosuppression.
  • This review provides a foundation for developing novel diagnostic and therapeutic strategies centered on macrophage manipulation in various diseases.
Keywords:
immunotherapynanoparticlespolarizationsignaling pathwaystumor microenvironmenttumor-associated macrophage

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