Table III.

Selective inhibition of expression of AC and IP3R isoforms

siRNA
AC3
AC6
IP3R1
IP3R2
IP3R3
AC3 40 ± 2a 123 ± 35 103 ± 9 93 ± 14 87 ± 7 
AC6 101 ± 27 38 ± 8a 91 ± 6 101 ± 12 92 ± 10 
IP3R1 ND ND 36 ± 6a 103 ± 9 138 ± 7 
IP3R2 ND ND 96 ± 18 ≤5a 77 ± 6 
siRNA
AC3
AC6
IP3R1
IP3R2
IP3R3
AC3 40 ± 2a 123 ± 35 103 ± 9 93 ± 14 87 ± 7 
AC6 101 ± 27 38 ± 8a 91 ± 6 101 ± 12 92 ± 10 
IP3R1 ND ND 36 ± 6a 103 ± 9 138 ± 7 
IP3R2 ND ND 96 ± 18 ≤5a 77 ± 6 

Quantification of levels of expression (percentage of control, means ± SEM from three to five independent transfections) of the isoforms of AC and IP3R from HEK-PR1 cells treated with the indicated siRNA. Samples were taken from the same cells that were used for measurements of [Ca2+]i and cAMP (Fig. 9). WB was used to quantify IP3R expression and QPCR for AC (available antibodies are incapable of detecting endogenous levels of AC). ND, not determined.

a

Indicates the extent to which expression of the target protein was reduced.

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