| First Author | Fairfax ST | Year | 2014 |
| Journal | Front Physiol | Volume | 5 |
| Pages | 387 | PubMed ID | 25339912 |
| Mgi Jnum | J:260039 | Mgi Id | MGI:6150184 |
| Doi | 10.3389/fphys.2014.00387 | Citation | Fairfax ST, et al. (2014) Ca(2+) signaling in arterioles and small arteries of conscious, restrained, optical biosensor mice. Front Physiol 5:387 |
| abstractText | UNLABELLED: Two-photon fluorescence microscopy and conscious, restrained optical biosensor mice were used to study smooth muscle Ca(2+) signaling in ear arterioles. Conscious mice were used in order to preserve normal mean arterial blood pressure (MAP) and sympathetic nerve activity (SNA). ExMLCK mice, which express a genetically-encoded smooth muscle-specific FRET-based Ca(2+) indicator, were equipped with blood pressure telemetry and immobilized for imaging. MAP was 101 +/- 4 mmHg in conscious restrained mice, similar to the freely mobile state (107 +/- 3 mmHg). Oscillatory vasomotion or irregular contractions were observed in most arterioles (71%), with the greatest oscillatory frequency observed at 0.25 s(-1). In a typical arteriole with an average diameter of ~35 mum, oscillatory vasomotion of a 5-6 mum magnitude was accompanied by nearly uniform [Ca(2+)] oscillations from ~0.1 to 0.5 muM, with maximum [Ca(2+)] occurring immediately before the rapid decrease in diameter. Very rapid, spatially uniform "Ca(2+) flashes" were also observed but not asynchronous propagating Ca(2+) waves. In contrast, vasomotion and dynamic Ca(2+) signals were rarely observed in ear arterioles of anesthetized exMLCK biosensor mice. Hexamethonium (30 mug/g BW, i.p.) caused a fall in MAP to 74 +/- 4 mmHg, arteriolar vasodilation, and abolition of vasomotion and synchronous Ca(2+) transients. SUMMARY: MAP and heart rate (HR) were normal during high-resolution Ca(2+) imaging of conscious, restrained mice. SNA induced continuous vasomotion and irregular vasoconstrictions via spatially uniform Ca(2+) signaling within the arterial wall. FRET-based biosensor mice and two-photon imaging provided the first measurements of [Ca(2+)] in vascular smooth muscle cells in arterioles of conscious animals. |
