Monocytes in sterile inflammation: recruitment and functional consequences

Area of Science:

• Immunology
• Cell Biology

Background:

• Monocytes are crucial for initiating innate immune responses.
• Three subsets exist in mice: classical, nonclassical, and intermediate monocytes.
• Their roles in infectious diseases are well-studied, but less is known about their function in sterile injuries.

Purpose of the Study:

• To review monocyte recruitment mechanisms during sterile injury.
• To examine monocyte actions and their impact on disease outcomes in murine models.
• To discuss potential therapeutic strategies targeting monocytes.

Main Methods:

• Review of existing literature on monocyte subsets in sterile injury models.
• Analysis of mechanisms of monocyte recruitment and function.
• Inclusion of human studies for comparative insights.

Main Results:

• Monocyte subsets exhibit diverse roles in sterile injury pathogenesis.
• Recruitment, activation, and effector functions vary based on injury type and monocyte subset.
• Evidence suggests both pro- and anti-inflammatory effects depending on the context.

Conclusions:

• Monocyte subsets play a complex role in sterile injuries such as ischemia-reperfusion, atherosclerosis, and trauma.
• Understanding these roles is critical for developing targeted therapies.
• Therapeutic strategies require caution due to the dual inflammatory capacity of monocyte subsets.