Abstract
Summary
Gey's strain HeLa cells were cultured in Earle T-60 flasks for almost a year in media composed of 0.25 g. yeast and 0.25 g. lactalbumin hydrolysate/1 Earle solution with 10% human or horse serum. Respiration was determined manometrically and lactate formation chemically. In preliminary experiments, 0.25% Difco trypsin (1:250) when used to separate cells, depressed respiration in some instances. Respiration of suspensions of HeLa was constant for an hour but decreased slightly after first hour. Metabolism of two lines of HeLa cells was compared. Respiration and glycolysis of cells grown in media containing homologous human serum was higher than that of cells grown in media containing horse serum. Human HeLa cells had a metabolism like that reported for tumor tissue in that respiration was low (Qo2 = 6.0) and aerobic glycolysis moderate (QO2 LA = 12.0). They differed from tumor tissue in that anerobic glycolysis was low (QN 2 LA = 5.5) and p-phenylenediamine stimulated respiration 338% (Qo2 = 26.3). There was no Pasteur Effect and Fermentation Excess was negative.
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