Myeloid-Derived Suppressor Cells in the Tumor Microenvironment: Current Knowledge and Future Perspectives

Area of Science:

• Immunology
• Oncology
• Cell Biology

Background:

• Tumor-infiltrating myeloid-derived suppressor cells (MDSCs) are extensively studied in murine models, with human data derived from patient samples.
• Knowledge of MDSC suppressive mechanisms in tumor-bearing hosts has informed the development of therapeutic agents targeting their activity.
• Increasing evidence highlights the role of MDSCs in tumor progression and metastasis.

Purpose of the Study:

• To review current knowledge on MDSC suppressive mechanisms.
• To summarize therapeutic strategies targeting MDSC differentiation, expansion, or activity.
• To discuss ex vivo MDSC generation methods to overcome limitations in cell availability.

Main Methods:

• Literature review of studies on MDSCs in murine models and human patient samples.
• Analysis of identified protein targets responsible for MDSC suppressive activity.
• Examination of therapeutic agents designed to counteract MDSC functions.
• Review of ex vivo methods for MDSC generation and differentiation.

Main Results:

• MDSCs employ various suppressive mechanisms in tumor-bearing hosts, informed by both animal and human studies.
• Therapeutic interventions targeting MDSCs have been developed based on identified suppressive pathways.
• The importance of MDSCs in promoting tumor progression and metastasis is increasingly recognized.
• Ex vivo generation of MDSCs offers a potential solution for limited cell availability in research.

Conclusions:

• Understanding MDSC suppressive mechanisms is critical for developing effective cancer immunotherapies.
• Targeting MDSCs presents a promising therapeutic avenue for cancer treatment.
• Advancements in ex vivo MDSC generation can facilitate further research into their complex roles in cancer.