Cluster of Differentiation 14 (CD14)

Molecular Classification

Pattern recognition receptor, Co-receptor

Disease Roles

InfectionSepsisInflammation

Cluster of Differentiation 14 Overview

CD14 is a key cell surface antigen and pattern recognition receptor primarily expressed on monocytes and macrophages. It exists in two forms: membrane-bound (mCD14) and soluble (sCD14). CD14 binds pathogen-associated molecular patterns (PAMPs), particularly LPS, and acts as a co-receptor with TLR4/MD-2 to initiate inflammatory signaling pathways. It plays a crucial role in innate immunity against bacterial infection but is also implicated in excessive inflammation and sepsis. Altered expression of CD14 is observed in various disease states beyond classical immune responses.

Mechanism of Action

CD14 acts as a co-receptor with TLR4/MD-2, facilitating LPS binding and subsequent activation of downstream signaling pathways, including NF-kB and type I interferon production.

Biological Functions

Innate immunity activation

Lipopolysaccharide (LPS) recognition

Toll-like receptor (TLR) signaling

Inflammatory response

Disease Associations

Infection

Sepsis

Inflammation

Organ injury

Safety Considerations

Excessive inflammatory response
Septic shock

Interacting Drugs

LPS antagonists (potential)

TLR4 antagonists (indirect)

Associated Biomarkers

Biomarker
sCD14 levels as a marker of inflammation and infection