Xenotoxic damage in inflammatory diseases, including IBD (inflammatory bowel disease), is compounded by reduced activity of the xenobiotic transporter ABCG2 (ATP-binding-cassette G2) during the inflammatory state. An association between the activation of the unfolded protein response pathway and inflammation prompted us to investigate the possibility that reduced ABCG2 activity is causally link...

Cancer stem cells (CSCs) are often characterized by the elevated expression of drug-resistance related stem-cell surface markers, such as CD133 and ABCG2. Recently, we reported that CSCs have a high level of expression of the IL-6 receptor (IL-6R). The purpose of this study was to investigate the effect of anticancer drugs on the expression of the drug resistance-related cancer stem cell marker...

objective(s): abc transporters comprise a large family of transmembrane proteins that use the energy provided by atp hydrolysis to translocate a variety of substrates across biological membranes. all members of the human abcg subfamily, except for abcg2, are cholesterol-transporter. the aim of this study was to determine the liver, the small intestine and kidney abcg5 relative gene expression i...

ATP-binding cassette transporter, sub-family G, member 2 (ABCG2/BCRP) is a xenobiotic transporter and also regulates serum uric acid levels as a urate transporter. We have shown that the severity of ABCG2 dysfunction can be estimated by simple genotyping of two dysfunctional variants, Q126X (rs72552713) and Q141K (rs2231142). This genotyping method is widely accepted for the risk analysis of hy...

ABCG2 is a multidrug resistance efflux pump expressed in many diverse tumors. The overexpression of ABCG2 is associated with resistance to a wide variety of anticancer agents, providing a noticeable setback to successful cancer therapy. Therapies targeting ABCG2 may therefore be a promising candidate for reversal of chemoresistance. The anti-ABCG2 single-chain variable fragment (scFv) antibody ...

Human ABCG2, a member of the ATP-binding cassette transporter superfamily, represents a promising target for sensitizing MDR in cancer chemotherapy. Although lots of ABCG2 inhibitors were identified, none of them has been tested clinically, maybe because of several problems such as toxicity or safety and pharmacokinetic uncertainty of compounds with novel chemical structures. One efficient solu...

BACKGROUND In addition to the kidney, the intestine is one of the most important organs involved in uric acid excretion. However, the mechanism of urate excretion in the intestine remains unclear. Therefore, the relationship between soluble uric acid and the gut excretion in human intestinal cells was explored. The relevant signaling molecules were then also examined. METHODS HT-29 and Caco-2...

The placenta plays an important role in modulating xenobiotic passage from mother to fetus. Studies in mice have demonstrated that placental ABCB1 and ABCG2 can affect the transfer of drugs across the placental barrier, suggesting a role for these transporters in protecting the fetus from environmental toxicants or drugs ingested by the mother during pregnancy. To assess the role of these trans...

The epidermal growth factor receptor (EGFR) regulates cellular expression levels of breast cancer resistance protein (humans: ABCG2, rodents: Abcg2) via its downstream signaling pathways. Drugs that inhibit EGFR signaling (e.g., tyrosine kinase inhibitors, antibodies) may lead to ABCG2-mediated drug-drug interactions (DDIs) by changing the disposition of concomitantly administered ABCG2 substra...

Overexpression of the ATP-dependent drug efflux pump ABCG2 is a major molecular mechanism of multidrug resistance in cancer and might be a predictive biomarker for drug response. Contradictory results have been reported for immunohistochemical studies of ABCG2 protein expression in colorectal cancer (CRC), probably because of the use of different antibodies and scoring approaches. In this study...