A. B. * * Systolic blood pressure (mmHg) Diastolic blood pressure (mmHg) Systolic blood pressure (mmHg) Diastolic blood pressure (mmHg) PMCA4WT PMCA4KO PMCA4WT PMCA4KO WT WT + ATA WT WT + ATA C. D. * * Figure 2: Differential effect of ablation and inhibition of PMCA4 on basal conscious blood pressure. Conscious systolic and diastolic blood pressure (BP) was not significantly altered by ablation of PMCA4 (A. mean ± SEM, n=6 & 6), however, ATA (BP recorded 90 minutes post 5mg/kg i.p injection) significantly (* P<0.05) reduced conscious BP in WT mice, (B. mean ± SEM, n=5 & 6). ATA treatment did not significantly affect conscious BP of PMCA4KO mice, (C. mean ± SEM, n=5 & 5). In PMCA4 WT mice, ATA treatment significantly (* P<0.05) reduced systolic BP, however no reduction in BP was observed following treatment with the specific nNOS inhibitor, Vinyl-L-Nio (VLN) alone or with both ATA and VLN, (D. mean ± SEM, n=11, 3, 3 & 5). Systolic blood pressure (mmHg) Diastolic blood pressure (mmHg) Systolic blood pressure (mmHg) Diastolic blood pressure (mmHg) PMCA4WT ATA VLN VLN + ATA PMCA4KO PMCA4KO + ATA PMCA4KO PMCA4KO + ATA PMCA4WT ATA VLN VLN + ATA