Contribution of viable and nonviable heart myocytes to substrate oxidation.
An approach is described that allows metabolic data obtained from a mixture of vital dye-excluding (T-) and nonexcluding (T+) myocytes to be extrapolated to a homogeneous cell population. Myocytes from adult dog hearts were dispersed by enzymatic treatment and separated into two fractions: one containing predominantly T-, and the other containing predominately T+ cells. Measuring the oxidation rate and viability of each fraction allows the determination of the rate of oxidation of a homogeneous cell population when palmitate, glucose, or lactate is the oxidizable substrate. The calculated rate of oxidation of these substrates by 100% T- cells was: 0.15, 0.46, and 2.99 nmol . mg protein-1 . min-1, respectively. Oxidation of palmitate and lactate by T+ cells was one-fifth of the T-cell rate. Glucose oxidation of T+ cells was not significantly different from zero. Use of this procedure will permit study of myocardial metabolism when experimental procedures may cause altered cell viability.
D000818:Animals; D002470:Cell Survival; D004285:Dogs; D005947:Glucose / Q000378:metabolism*; D007773:Lactates / Q000378:metabolism; D009206:Myocardium / Q000166:cytology / Q000378:metabolism*; D010168:Palmitates / Q000378:metabolism; D014343:Trypan Blue
D007773:Lactates; D010168:Palmitates; D014343:Trypan Blue; D005947:Glucose