Abstract
To study platelet cell calcium in dogs, we measured the fura-2-determined calcium concentration (Cai) in platelets derived from blood drawn through indwelling arterial catheters in four dogs. Platelet samples were obtained 3 days a week for 39 days. Canine platelet Cai averages 40.5 +/- 1.7 nmol/L when corrected for extracellular fura-2 dye (n = 46); this mean is significantly smaller than the value obtained without such a correction (50.2 +/- 2.0 nmol/L, P < .05). The amplitude of thrombin-induced Ca2+ transients is proportional to basal Cai, increasing 4.9 +/- 0.9 nmol/L peak Ca2+ per nmol/L increase in baseline Ca2+.
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