Analysis of P-glycoprotein-mediated membrane transport in human peripheral blood lymphocytes using the UIC2 shift assay.
Authors:Park SW, Lomri N, Simeoni LA, Fruehauf JP, Mechetner E
Journal:Cytometry A
PubMed ID:12766968
'BACKGROUND: During transport-associated adenosine triphosphate hydrolysis, P-glycoprotein (Pgp) undergoes conformation transitions detected by UIC2, a functional anti-Pgp monoclonal antibody. A newly developed UIC2 shift assay is based on increased UIC2 reactivity in the presence of Pgp substrates. All peripheral blood leukocytes express low Pgp levels. The existing antibody-based detection methods ... More
Fluorescent cationic probes of mitochondria. Metrics and mechanism of interaction.
Authors:Bunting JR, Phan TV, Kamali E, Dowben RM
Journal:Biophys J
PubMed ID:2605307
'Mitochondria strongly accumulate amphiphilic cations. We report here a study of the association of respiring rat liver mitochondria with several fluorescent cationic dyes from differing structural classes. Using gravimetric and fluorometric analysis of dye partition, we find that dyes and mitochondria interact in three ways: (a) uptake with fluorescence quenching, ... More
The repetitive calcium waves in the fertilized ascidian egg are initiated near the vegetal pole by a cortical pacemaker.
Authors:Speksnijder JE
Journal:Dev Biol
PubMed ID:1397683
'Ascidian eggs respond to fertilization with a series of repetitive calcium waves that originate mostly from the vegetal/contraction pole region (J. E. Speksnijder, C. Sardet, and L. F. Jaffe, 1990, Dev. Biol. 142, 246-249), where the myoplasm is concentrated during the first phase of ooplasmic segregation. This suggests that the ... More
Transmembrane inhibitors of P-glycoprotein, an ABC transporter.
Authors:Tarasova NI, Seth R, Tarasov SG, Kosakowska-Cholody T, Hrycyna CA, Gottesman MM, Michejda CJ
Journal:J Med Chem
PubMed ID:15916428
'Drug resistance mediated by ABC transporters such as P-glycoprotein (P-gp) continues to be a major impediment to effective cancer chemotherapy. We have developed a panel of highly specific peptide inhibitors of P-gp based on the structure of the transmembrane domains of the transporter. These peptides are thought to exert their ... More
DiOC2(3) is not a substrate for multidrug resistance protein (MRP)-mediated drug efflux.
Authors:Minderman H, Vanhoefer U, Toth K, Yin MB, Minderman MD, Wrzosek C, Slovak ML, Rustum YM
Journal:Cytometry
PubMed ID:8875050
'Multidrug resistance (MDR) is often related to expression of P-glycoprotein (Pgp) or Multidrug Resistance Protein (MRP). Pgp-mediated MDR can be evaluated by determining cellular retention of fluorescent substrates by flow cytometry. This study determined if agents used to evaluate Pgp function also can be used to evaluate MRP function. Cellular ... More