CLEC4E

CLEC4E Full Name

C-type lectin domain family 4, member E

CLEC4E Introduction

C-type lectin domain family 4 member E (CLEC4E), commonly known as macrophage-inducible C-type lectin (Mincle), is a pattern recognition receptor (PRR) of the C-type lectin receptor family encoded by the CLEC4E gene within the NK gene complex on chromosome 12p13.31. Mincle is predominantly expressed on myeloid lineage cells, including macrophages, dendritic cells, and neutrophils, and its expression is strongly induced by inflammatory stimuli such as LPS, TNF-α, and IL-6. As a key innate immune sensor, Mincle recognizes a diverse array of pathogen-associated molecular patterns (PAMPs) and damage-associated molecular patterns (DAMPs).

Figure 1. CLEC4E signaling and cellular responses.

Ligand Recognition and Signal Transduction
Mincle recognizes carbohydrate-containing ligands, with its best-characterized exogenous ligand being trehalose-6,6'-dimycolate (TDM), also known as cord factor, a major virulence factor of Mycobacterium tuberculosis. Mincle also senses fungal pathogens through recognition of α-mannose-containing structures on Candida albicans and Malassezia species, and responds to endogenous danger signals such as spliceosome-associated protein 130 (SAP130) released from necrotic cells. Ligand binding triggers Mincle signaling through its association with the ITAM-bearing adaptor protein FcRγ. Syk kinase recruitment to phosphorylated FcRγ ITAMs initiates a signaling cascade involving CARD9-BCL10-MALT1 complex formation, leading to NF-κB activation and the production of pro-inflammatory cytokines including TNF, IL-6, and IL-1β.

Mincle in Infectious Disease, Sterile Inflammation, and Vaccine Adjuvant Development
Beyond its established role in anti-mycobacterial immunity, Mincle participates in the pathogenesis of sterile inflammatory conditions, including obesity-induced adipose tissue inflammation, ischemic stroke, and non-alcoholic steatohepatitis (NASH). In these contexts, Mincle senses endogenous DAMPs released from dying cells, perpetuating chronic inflammatory cycles. The potent immunostimulatory capacity of Mincle has also been harnessed for adjuvant development: synthetic TDM analogs and Mincle agonistic antibodies are under investigation as vaccine adjuvants to enhance cellular and humoral immune responses. The selective Mincle agonist trehalose-6,6-dibehenate (TDB) has shown particular promise in preclinical models as a Th1/Th17-polarizing adjuvant for tuberculosis and cancer vaccines.

Alternate Names for CLEC4E

CLEC4E; C-type lectin domain family 4, member E; C type (calcium dependent, carbohydrate recognition domain) lectin, superfamily member 9 , CLECSF9; C-type lectin domain family 4 member E; mincle; C type lectin domain family 4 member E; C type lectin superfamily member 9; C-type (calcium dependent carbohydrate recognition domain) lectin superfamily member 9; CLEC 4E; CLECSF9