Low mobility of phosphatidylinositol 4,5-bisphosphate underlies receptor specificity of Gq-mediated ion channel regulation in atrial myocytes.
AuthorsCho H, Kim YA, Yoon JY, Lee D, Kim JH, Lee SH, Ho WK
JournalProc Natl Acad Sci U S A
PubMed ID16217031
'We have shown previously that cardiac G protein-gated inwardly rectifying K+ (GIRK) channels are inhibited by Gq protein-coupled receptors (GqPCRs) via phosphatidylinositol 4,5-bisphosphate (PIP2) depletion in a receptor-specific manner. To investigate the mechanism of receptor specificity, we examined whether the activation of GqPCRs induces localized PIP2 depletion. When we applied ... More
Separation of phospholipids in microfluidic chip device: application to high-throughput screening assays for lipid-modifying enzymes.
AuthorsLin S, Fischl AS, Bi X, Parce W
JournalAnal Biochem
PubMed ID12633607
Phospholipid molecules such as ceramide and phosphoinositides play crucial roles in signal transduction pathways. Lipid-modifying enzymes including sphingomyelinase and phosphoinositide kinases regulate the generation and degradation of these lipid-signaling molecules and are important therapeutic targets in drug discovery. We now report a sensitive and convenient method to separate these lipids ... More