Glucose utilization, pH reduction and density dependent inhibition in cultures of chick embryo fibroblasts.

Abstract:

:The multiplication rate of sparse cultures of chick embryo cells is only slightly lower at pH 6.9 than at pH 7.4. There is, however, a marked reduction in the multiplication rate of the pH 6.9 cultures before they reach confluency. Cultures at pH 7.4 continue to multiply beyond confluency with only a slight decrease in the multiplication rate. Eighty to ninety percent of the glucose taken up by the cells growing at each pH is converted to lactic acid which is released into the medium. Metabolic reduction in pH of the medium is almost entirely accounted for by the amount of lactic acid produced by the cells. Neither the intracellular nor extracellular accumulation of lactic acid nor the accompanying reduction in pH is sufficient to explain density dependent inhibition of the rate of multiplication of chick cells. The rate of lactic acid production and the multiplication rate of chick cells are independent of glucose concentration in the range of 2--16 mM. In view of the kinetic parameters for the uptake of glucose, this shows that glycolysis is not limited by the rate of glucose uptake and that depletion of glucose from the medium cannot account for the onset of density dependent inhibition of multiplication. However, when cells reach very high population densities, conventional glucose concentrations of 5 mM can be depleted overnight by chick cells. Since the multiplication rate of cells is dependent on glucose concentration when it falls below 2 mM, depletion of glucose may cause some growth inhibition in crowded cultures supplied with conventional medium.

journal_name

J Cell Physiol

authors

Fodge DW,Rubin H

doi

10.1002/jcp.1040850316

subject

Has Abstract

pub_date

1975-06-01 00:00:00

pages

635-42

issue

3

eissn

0021-9541

issn

1097-4652

journal_volume

85

pub_type

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