Colony stimulating factors and myeloid cell biology in health and disease

Area of Science:

• Immunology
• Hematology
• Cell Biology

Background:

• Colony stimulating factors (CSFs) like GM-CSF, M-CSF, and G-CSF are critical regulators of myeloid cell development and function.
• These factors play roles in both normal physiological conditions (steady state) and inflammatory responses.
• Preclinical studies indicate potential therapeutic benefits of targeting CSFs in autoimmune and inflammatory diseases.

Purpose of the Study:

• To review recent advancements in understanding CSF function.
• To discuss the impact of CSF and CSF receptor manipulation studies on myeloid cell biology.
• To highlight the emerging role of interleukin-34 (IL-34) in CSF biology.

Main Methods:

• Analysis of studies involving CSF or CSF receptor neutralization/deletion.
• Review of data from CSF administration experiments.
• Examination of findings from preclinical and clinical investigations.

Main Results:

• CSFs are confirmed regulators of myeloid cell numbers and functions in various conditions.
• CSF targeting strategies are under clinical investigation for inflammatory and autoimmune diseases.
• The identification of IL-34 as an M-CSF receptor ligand necessitates a re-evaluation of M-CSF signaling pathways.

Conclusions:

• CSF biology is complex, with ongoing debates regarding their precise roles in specific myeloid cell populations.
• Interleukin-34 significantly impacts the understanding of macrophage-CSF (M-CSF) function.
• Further research into CSF and IL-34 pathways is crucial for developing novel immunomodulatory therapies.