U 73343 is an inactive analogue of U 73122. U 73122 is a widely used inhibitor of receptor-mediated phospholipase C (PLC), which inhibits the role of PLC in endothelin-1 (ET-1) and parathyroid hormone (PTH)-induced calcium transients. U 73343 is inactive and is often used as a negative control for U 73122[1][2].
References:
[1] Muto Y, Nagao T, Urushidani T. The putative phospholipase C inhibitor U73122 and its negative control, U73343, elicit unexpected effects on the rabbit parietal cell. J Pharmacol Exp Ther. 1997;282(3):1379-1388.
[2] Tatrai A, Lee SK, Stern PH. U-73122, a phospholipase C antagonist, inhibits effects of endothelin-1 and parathyroid hormone on signal transduction in UMR-106 osteoblastic cells. Biochim Biophys Acta. 1994;1224(3):575-582.
















