Exploring the pharmacology of the leukotriene B-4 receptor BLT1, without the confounding effects of BLT2
Publikation/Tidskrift/Serie: European Journal of Pharmacology
Förlag: Elsevier Science B.V.
Most previous studies of leukotriene B-4 (LTB4) pharmacology using primary leukocyte cultures and myeloid cell lines do not differentiate between leukotriene BLT1 and BLT1 receptor activation because both receptors are often expressed by these cells. Here we show that in HeLa cells expressing BLT1 but not BLT2 receptors, BLT1 receptor activation resulted in IP3 mediated calcium release from intracellular stores initially, followed by calcium influx through cell membrane channels. BLT1 calcium signalling was sensitive to the activity of protein kinase C (PKC). protein kinase A (PKA) and protein-tyrosine kinases (PTKs), as well as changes in membrane cholesterol levels and treatments that are known to disrupt normal membrane physiology and/or lipid rafts. Inhibition of MAP kinases, Rho-associated kinases, or phosphomositol-3-kinases (PI3K) had no effect on BLT1 receptor induced calcium signalling, and the receptor was insensitive to the redox state of the extracellular compartment. (C) 2004 Elsevier B.V. All rights reserved.
- Medicine and Health Sciences
- leukotriene B-4
- g-protein coupled receptor
- ISSN: 0014-2999