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- W1606861566 abstract "Mitochondria were prepared from bovine mesenteric vein and main pulmonary artery in the presence of bovine serum albumin. Standard preparations contained between 30 and 60% of mitochondrial protein. Rates of substrate oxidation were measured polarographically. Succinate was oxidized at rates of 117.1 ± 16 and 92.3 ± 13 nmol of (O2/min/mg of main pulmonary artery and mesenteric vein mitochondrial protein, respectively. Other substrates were oxidized less rapidly. The calcium content of vascular smooth muscle mitochondria prepared in the presence and absence of EDTA was found to be much higher than in mitochondria from all other sources. Initial velocities of respiration-supported calcium uptake were measured by dual-wavelength techniques. Rates were slow at 1 μm Ca2+ but increased almost linearly up to 25 μm Ca2+. The maximal velocities (12 and 4 nmol of Ca2+/s/mg of main pulmonary artery and mesenteric vein mitochondrial protein, respectively) were observed at 75 μm Ca2+, and the half-maximal transports occurred at 17 μm. At all [Ca2+]tested, the rate of Ca2+ transport was lower by mesenteric vein than by main pulmonary artery mitochondria. Vascular smooth muscle mitochondria can tolerate as much as 210 nmol of Ca2+mg of mitochondrial protein without uncoupling. These findings are discussed in terms of physiological regulation of cytosolic calcium levels in smooth muscle." @default.
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- W1606861566 date "1975-01-01" @default.
- W1606861566 modified "2023-10-15" @default.
- W1606861566 title "Subcellular fractions of smooth muscle" @default.
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- W1606861566 doi "https://doi.org/10.1016/0003-9861(75)90162-9" @default.
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