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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 μm, oscillatory vasomotion of a 5–6 μm magnitude was accompanied by nearly uniform [Ca 2+ ] oscillations from ~0.1 to 0.5 μM, 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 μg/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.

Ca2+ signaling in arterioles and small arteries of conscious, restrained, optical biosensor mice