Diversity in lactic dehydrogenase electrophoretic patterns with human cell cultures

Changes in the activity and isozyme patterns of glycolytic enzymes during stimulation of normal human lymphocytes with phytohaemagglutinin

A study has been made of the effects of phytohaemagglutinin on the gene expression of the glycolytic enzymes in cultured human lymphocytes. All the enzymes were found to show an average increase in activity of between 160% and 360% in stimulated cells, but the increases were greater for the enzymes comprising the second half of the pathway. The enzyme activities in stimulated cells, cultured for 72 h, were similar to the activities measured in long-term lymphoid lines. Starch-gel electrophoresis was used to examine the isozyme patterns of the enzymes before and after exposure of the lymphocytes to PHA. Six of the enzymes showed isozyme patterns unchanged by stimulation. Four of the enzymes, aldolase, triosephosphate isomerase, enolase and lactate dehydrogenase, showed different isozyme patterns in stimulated cells from those seen in uncultured or unstimulated cells. The electrophoretic results showed a good correlation in isozyme pattern between uncultured lymphocytes and cultured unstimulated lymphocytes, and between PHA-stimulated lymphocytes and long-term lymphoid lines.

Cultivated cells from diagnostic amniocentesis in second trimester pregnancies. III. The fetal urine as a potential source of clonable cells

Four independent fetal urine specimens yielded clonal growth. The mature colonies were similar to certain classes of amniotic fluid cell clones, and to those obtained from fetal kidney. Kidney specific LDH isozyme patterns, however, were not observed in any of these primary clones.

Factors affecting the lactate dehydrogenase isoenzyme pattern of cultured kidney-cortex cells

1. The lactate dehydrogenase isoenzyme pattern of cultured calf kidney-cortex cells was correlated to growth phase, changes in oxygen supply, mean generation time and changes in nutritional supply. 2. During culture of free cells and intact explants the lactate dehydrogenase isoenzyme pattern changed towards a dominance of isoenzymes containing the M subunit. 3. Of the shift in monomer proportion, 58% occurred during the lag phase and 42% during the initial part of the exponential growth phase. During the stationary phase the shift in monomer proportion reversed slightly. It was possible to relate the observed shift in monomer proportion to the glycolytic rate. 4. Factors that depressed glycolysis decreased the shift in monomer proportion. Oxygen was found to limit the decrease in the H subunit/M subunit ratio caused by anaerobic culture in vitro. 5. The results obtained support the view that the altered lactate dehydrogenase isoenzyme pattern of urine in renal ischaemia may be explained by anaerobic changes in the lactate dehydrogenase isoenzyme pattern of cortical tubule cells.