Senescent macrophages in tumor: phenotypes, roles, and interventions

Area of Science:

• Immunology
• Oncology
• Cellular Biology

Background:

• Immune cell senescence, particularly of macrophages, is increasingly recognized in tumor initiation and development.
• Senescent macrophages (sMACs) within the tumor microenvironment (TME) display unique molecular characteristics.
• These characteristics include cell cycle arrest, senescence-associated secretory phenotype (SASP), and senescence-associated β-galactosidase (SA-β-gal) activity.

Purpose of the Study:

• To review recent advances in understanding senescent macrophages (sMACs).
• To explore the phenotypical molecular characteristics, potential functions, and intervention approaches for sMACs.
• To elucidate the role of sMACs in the TME and their contribution to the tumor-aging balance.

Main Methods:

• Literature review of recent studies on senescent macrophages.
• Analysis of molecular characteristics, including SASP and SA-β-gal phenotypes.
• Examination of sMACs' dialogue and mediation of signaling pathways in the TME.

Main Results:

• Senescent macrophages (sMACs) possess distinct molecular signatures within the TME.
• These sMACs exhibit functional richness and potential as biomarkers for identification.
• sMACs play a role in the complex interplay between tumor cells and immune cells.

Conclusions:

• Senescent macrophages are a significant component of the TME with implications for tumor progression.
• Further research into sMACs' functions and interactions is vital for understanding the tumor-aging axis.
• Targeting sMACs presents a potential avenue for novel cancer therapeutic strategies.