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The situation is further complicated by the finding that elevated Ca2+ itself was a strong stimulus for cAMP elevation in GLUTag cells, presumably via AC1 activation.
STC1 induction was similar for all three receptor splice variants and was mimicked by the adenylate cyclase activator forskolin, indicating that cAMP elevation is sufficient to induce STC1.
Once we had arrived at the other side, we made our way across a rock-strewn field to get to our base camp, elevation twelve thousand six hundred and thirty-one feet.
Near Swiss Camp — elevation 3,770 feet — there is a huge depression where one such lake forms each July, but by that point no one is around to see it: it would be far too dangerous.
cAMP elevation activated PKA.
In contrast, we found that glucose-evoked cAMP elevation was unaffected by removing Ca2+ from the bath (Figure 6C,D).
Significantly, nifedipine, but not wortmannin, inhibited the induction of CREB phosphorylation by eA5 (Figure 8E) consistent with VSCCs but not PI3K lying on the pathway to cAMP elevation.
In that study, glucose-dependent cAMP elevation occurred only after calcium elevation, and large cAMP oscillations (at ≈0.5/min) occurred in synchrony with Ca2+ fluctuations.
Similarly, VAKGL but not the control peptide VAAGL at 10 µM concentration also completely prevented this acute morphine-induced cAMP elevation (Fig. 4A).
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The GDP/GTP exchange factor RalGDS has recently been shown to activate Ral proteins in response to [Ca2+]i and cAMP elevations in endothelial cells [27].
We validated cAMP sponge at the single cell level using a FRET-based imaging approach and demonstrated that it was able to block agonist-induced cAMP elevations (EPAC H30, figure 4a c) and the downstream PKA activation (AKAR3, Figure 4d).
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