| Modification Notes |
The P2Y receptor family consists of G-protein coupled receptors, which mediate the effects of extracellular nucleotides, primarily through the activation of phospholipase C. The P2Y receptors are important in the activation of leukocytes and platelets in response to inflammation or vascular damage. Leukotriene B4 receptor 1 (LTB4-R1), also designated P2Y purinoceptor 7, is a receptor for extracellular ATP, UTP and ADP. Through modulation of L-type calcium currents, LTB4-R1 is involved in the regulation of cardiac muscle contraction. It is also a receptor for leukotriene B4 (LTB4), a potent chemoattractant involved in inflammation and immumne response. Leukotriene B4 receptor 2 (LTB4R2) is a ubiquitously expressed 358-amino acid receptor for LTB4. It is an integral membrane protein acting as a receptor for leukotrienes, is widely expressed and mediates chemotaxis of macrophages and granulocytes. |