U 73343 is an inactive analog of the putative phospholipase C antagonist U 73122. Phospholipase C is a class of membrane-associated enzymes, which plays an important role in signal transduction pathways by cleaving phosphatidylinositol 4,5-bisphosphate into diacylglycerol and inositol 1,4,5-trisphosphate, which serve as second messengers. Therefore, U 73343 can be used as a negative control of U 73122 for elucidating the role of phospholipase C in a variety of biological events such as gastric acid secretion and hormone-stimulated calcium signals.?
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. Journal of Pharmacology and Experimental Therapeutics, 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. Biochimica et Biophysica Acta, 1994, 1224(3): 575-582.
