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HEK-293 cells in 6-cm dishes were transfected with 4.2 ?g of total plasmid DNA distributed as follows: 0.24 ?g of p3TP-Lux, 0.12 ?g of pCMV/��-gal, 1.2 ?g of CaSR DNA or the indicated CaSR mutants or control plasmid, and 2.64 ?g of pCR3.1 plasmid. Next day, cells were re-plated into 12-well plates. Forty-eight hours post-transfection, cells were starved of serum for 5 H, followed by 1 H incubation in low calcium media. Then, stimulated with 4 mM calcium for 1 H and 100 pM of TGF-��1 was added to the media and incubated for 16 H. Luciferase activity was measured with a Promega (Promega Co. Fitchburg, Wisconsin) assay system and adjusted http://www.selleckchem.com/products/lgk-974.html to the transfection efficiency determined by the activity of co-transfected ��-galactosidase, measured as described [13]. C9 hepatocyte cells in 6-cm dishes were starved with low calcium media for 16 H, then stimulated with 4 mM calcium in the presence of 1 ?M of R568 for http://www.selleck.cn/products/VX-809.html 1 H, followed by addition of 100 pM TGF-��1 and incubated for 16 H at 37��C. Control cells received the appropriate vehicle. Conditioned media was centrifuged and PTHrP 1�C34 was measured by the use of a competitive enzyme immunoassay following the manufacturer's instructions (Peninsula Laboratories, Bachem. Bubendorf, Switzerland). The effect of CaSR carboxyl-terminal mutants on Smad2 activation was analyzed using Student's t test. All other results were subjected to analysis of variance and Student�CNewman�CKeuls, Tukey test, or Bonferroni test using GraphPad Prism version 2.0 software (GraphPad Software, Inc. La Jolla, CA), differences of P? http://www.selleckchem.com/products/17-AAG(Geldanamycin).html In order to determine whether CaSR regulates canonical TGF-��-dependent signaling, we tested the effect of extracellular calcium, the natural agonist of CaSR, on Smad2 phosphorylation in HEK-293 cells expressing either wild type CaSR or the E297K CaSR inactivating mutant. As shown in Figure 1A, TGF-��-dependent Smad2 phosphorylation was significantly reduced in cells in which CaSR was stimulated with 4 mM calcium. Interestingly, Smad2 protein level was reduced in cells expressing CaSR, this reduction was even more pronounced in cells stimulated with calcium followed by TGF-��. To examine the functional consequences of CaSR activation on TGF-�� receptor transcriptional events, we used a standard TGF-�� signaling reporter known to respond to activated Smads. As shown in Figure 1B, the level of luciferase activity driven by 3TP-Lux TGF-��-dependent reporter was significantly reduced by stimulation of CaSR with 4 mM calcium, whereas the simple overexpression of CaSR was sufficient to produce an inhibitory effect in cells incubated with 0.5 mM of calcium, putatively due to a marginal effect of this concentration of calcium on CaSR signaling, as reported [14]. None of these treatments had any significant effect on CaSR protein levels during the stimulation period.