ATP Binding Cassette Subfamily B Member 4
PFIC-3
MDR2
GBD1
MDR3
PGY3
ATP-Binding Cassette, Sub-Family B (MDR/TAP), Member 4
ATP-Binding Cassette Sub-Family B Member 4
Phosphatidylcholine Translocator ABCB4
Multidrug Resistance Protein 3
P-Glycoprotein 3
P-Glycoprotein-3/Multiple Drug Resistance-3
Multiple Drug Resistance 3
EC 3.6.3.44
EC 7.6.2.1
EC 3.6.3
MDR2/3
ABC21
ICP3
The membrane-associated protein encoded by this gene is a member of the superfamily of ATP-binding cassette (ABC) transporters. ABC proteins transport various molecules across extra- and intra-cellular membranes. ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, White). This protein is a member of the MDR/TAP subfamily. Members of the MDR/TAP subfamily are involved in multidrug resistance as well as antigen presentation. This gene encodes a full transporter and member of the p-glycoprotein family of membrane proteins with phosphatidylcholine as its substrate. The function of this protein has not yet been determined; however, it may involve transport of phospholipids from liver hepatocytes into bile. Alternative splicing of this gene results in several products of undetermined function. [provided by RefSeq, Jul 2008]
Forensic Context
A study in mice demonstrated that the ABCB4 was upregulated in common in splenocytes at day 7 post-injury following both burn and trauma-hemorrhage, where it was identified as a gene expression marker associated with the immune response [Lederer et al. DOI:10.1152/physiolgenomics.00086.2007]. In a porcine model of alcohol-induced liver fibrosis, the ABCB4 was found to be downregulated in fibrotic livers and is categorized as a transporter involved in chemotherapeutic efflux [Yasmin et al. DOI:10.1016/J.Biochi.2020.12.022]. A study in mice demonstrated that the ABCB4 gene, involved in bile acid secretion, was significantly up-regulated by alcohol in alcoholic liver disease (ALD) mice, and intervention with Gentiana dahurica Fisch ethanol extract (GDEE) further up-regulated its expression [Cao et al. DOI:10.1016/J.Jep.2020.113422].