71 research outputs found
Vascular reactivity in hypertension: Altered effect of ouabain
Ouabain inhibits the relaxing effect of Ca 2+ (but not of Mn 2+ ) on contractile responses in tail artery strips isolated from spontaneously hypertensive and normotensive rats. The magnitude of ouabain inhibition was greater in vascular strips from hypertensive rats suggesting a significant difference in basic membrane function in hypertensive vascular smooth muscle.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/42713/1/18_2005_Article_BF01953743.pd
Heterogeneity of mitochondrial matrix free Ca2+: resolution of Ca2+ dynamics in individual mitochondria in situ
The role of mitochondria in Ca2+ homeostasis is controversial. We employed the Ca2+-sensitive dye rhod 2 with novel, high temporal and spatial resolution imaging to evaluate changes in the matrix free Ca2+ concentration of individual mitochondria ([Ca2+](m)) in agonist-stimulated, primary cultured aortic myocytes. Stimulation with 10 mu M serotonin (5-HT) evoked modest cytosolic Ca2+ transients [cytosolic free Ca2+ concentration ([Ca2+](cyt)) 1,000 nM) and induced pronounced, reversible elevation of [Ca2+](m) (measured as rhod 2 fluorescence) in 60% of cells. This mitochondrial Ca2+ uptake usually lagged behind the cytosolic Ca2+ transient peak by 3-5 s, and [Ca2+], declined more slowly than did bulk [Ca2+](cyt). The uptake delay may prevent mitochondria from interfering with rapid signaling events while enhancing the mitochondrial response to large, long-duration elevations of [Ca2+](cyt). The responses of arterial myocytes to modest physiological stimulation do not, however, depend on such marked changes in [Ca2+](m)
Temporal and spatial resolution of mitochondrial matrix free Ca2+ dynamics in rat aortic myocytes
Effects of internal and external cations and of ATP on sodium-calcium and calcium-calcium exchange in squid axons
Effects of ouabain on spontaneous intracellular calcium oscillations in rat cultured hippocampal neurons Forty First Annual Meeting March 2-6, 1997 Ernest N. Morial Convention Center New Orleans, Louisiana. Monday Symposia and Posters
Neuronal injury in NCX3 knockout mice following permanent focal cerebral ischemia and in NCX3 knockout cortical neuronal cultures following oxygen-glucose deprivation and glutamate exposure
- …