Figure 6(A, B): ER Ca2+ content was measured with ER-GECO1 in the periphery (A) and the center (B) or cells transfected with M3 receptors and with (red, green) or without (black, blue) ANO8. Receptor mediated store depletion was initiated by stimulating the cells with 0.5 mM carbachol in Ca2+-free solution. Cell stimulation was terminated with 10 µM atropine and ER Ca2+ uptake was initiated by perfusing the cells with a solution containing 5 mM Ca2+. The fluorescence was measured as F/F0 and normalized to the initial fluorescence in the presence of ANO8. Panel (C) shows traces of ER Ca2+ uptake at expanded time scale in the periods marked by rectangular in (A and B) and the averaged slopes of ER Ca2+ influx and (D) shows the averaged slope of Ca2+ release at the cell periphery (Peri) and cell center (Center). In (C) the traces were aligned along the Y axis to better show the difference in uptake rate. Data information: The first number in parenthesis indicates the number of similar experiments performed and the second number is the number of cells analyzed. All results are given as mean±s.e.m of the indicated number of experiments or cells analyzed, and difference were analyzed by unpaired t test.(E) Enhancement by ANO8 of the Co-IP of expressed STIM1 with PMCA4a and SERCA2 and of Orai1 with SERCA2 in resting and store depleted cells. Data information: The first number in parenthesis indicates the number of similar experiments performed and the second number is the number of cells analyzed. All results are given as mean±s.e.m of the indicated number of experiments or cells analyzed, and difference were analyzed by unpaired t test.(F) Effect of ANO8 expression on the Co-IP of the native SERCA2 and STIM1 in resting and store depleted cells. The columns are the mean±s.e.m of 3 experiments. Data information: The first number in parenthesis indicates the number of similar experiments performed and the second number is the number of cells analyzed. All results are given as mean±s.e.m of the indicated number of experiments or cells analyzed, and difference were analyzed by unpaired t test.(G) FRET ratio between STIM1 and SERCA2 in response to store depletion and its enhancement by ANO8. Data information: The first number in parenthesis indicates the number of similar experiments performed and the second number is the number of cells analyzed. All results are given as mean±s.e.m of the indicated number of experiments or cells analyzed, and difference were analyzed by unpaired t test.(H, I) Simultaneous measurements of ER Ca2+ with ER-GECO1 and PI(4,5)P2 hydrolysis with PHPLCδ-GFP in response to cell stimulation of M3 receptors. Traces are shown in (h) and the average slopes are in (i). Data information: The first number in parenthesis indicates the number of similar experiments performed and the second number is the number of cells analyzed. All results are given as mean±s.e.m of the indicated number of experiments or cells analyzed, and difference were analyzed by unpaired t test.(J) Effect of ANO8 on the Co-IP of the native STIM1 and IP3Rs. The columns are the mean±s.e.m of 3 experiments. Data information: The first number in parenthesis indicates the number of similar experiments performed and the second number is the number of cells analyzed. All results are given as mean±s.e.m of the indicated number of experiments or cells analyzed, and difference were analyzed by unpaired t test.(K) FRET ratio between expressed STIM1 and IP3R3 in response to store depletion and its enhancement by ANO8. Data information: The first number in parenthesis indicates the number of similar experiments performed and the second number is the number of cells analyzed. All results are given as mean±s.e.m of the indicated number of experiments or cells analyzed, and difference were analyzed by unpaired t test.(L) FRET ratio between expressed STIM1 and PMCA4 in response to store depletion and its enhancement by ANO8. Data information: The first number in parenthesis indicates the number of similar experiments performed and the second number is the number of cells analyzed. All results are given as mean±s.e.m of the indicated number of experiments or cells analyzed, and difference were analyzed by unpaired t test.