The class F scavenger receptor 1 (SCARF1/SREC-I) contains epidermal growth factor (EGF)-like repeats in its extracellular domain, followed by a long C-terminal cytoplasmic tail composed of serine and proline-rich regions. SCARF1 is an endocytic receptor for acetylated low density lipoprotein, HSP70, HSP90, calreticulin, gp96, and GP2 [, , , , ]. Dendritic cells (DCs),macrophages and endothelial cells use SCARF1 to recognize and engulf apoptotic cells via the complement component C1q; this mediates apoptotic cells clearance, antigen clearance and prevents autoimmunity [].
The class F scavenger receptors (SCARFs or SRECs) have two isoforms, SCARF1/SREC-I and SCARF2/SREC-II. Similar to SREC-I, SREC-II contains multiple epidermal growth factor-like repeats in its extracellular domain. However, in contrast to SREC-I, SREC-II had little activity to internalize modified low density lipoproteins (LDL). SREC-II and SREC-I display strong heterophilic trans-interaction through the extracellular domains []. They are expressed in a specific temporal and spatial pattern during epidermal development [].Mutations in the SCARF2 gene cause Van den Ende-Gupta syndrome (VDEGS), a syndrome characterised by craniofacial and skeletal abnormalities []. The class F scavenger receptor 1 (SCARF1/SREC-I) contains epidermal growth factor (EGF)-like repeats in its extracellular domain, followed by a long C-terminal cytoplasmic tail composed of serine and proline-rich regions. SCARF1 is an endocytic receptor for acetylated low density lipoprotein, HSP70, HSP90, calreticulin, gp96, and GP2 [, , , , ]. Dendritic cells (DCs), macrophages and endothelial cells use SCARF1 to recognize and engulf apoptotic cells via the complement component C1q; this mediates apoptotic cells clearance, antigen clearance and prevents autoimmunity [].
