Caldini R, Chevanne M, Magnelli L. Changes in pyridine and adenine nucleotide levels in Friend erythroleukaemia cells during growth and differentiation.
J Cell Physiol 1992;
151:172-9. [PMID:
1313819 DOI:
10.1002/jcp.1041510122]
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Abstract
Pyridine and adenine nucleotide levels were measured in Friend erythroleukaemia cells (FELC) stimulated to growth and induced to differentiate by hexamethylene bisacetamide (HMBA) and N'-methylnicotinamide (N'-MNAM). A three- to fourfold increase in the NADP(H) was found to parallel cell growth stimulation in both the presence and absence of differentiation inducers. NAD(H) increased about twofold in control and to a minor extent in HMBA-treated FELC but did not vary significantly in N'-MNAM-treated cells. ATP was significantly higher in control cells stimulated to growth than in resting ones, but it did not vary in inducer-treated cells. These data confirm the relationship between high NADP(H) levels and cell resumption to growth; moreover they show that NAD(H) pool reduction and NAD/NADH ratio rise are associated with the process of FELC differentiation. The activities of NAD pyrophosphorylase and NAD kinase are much more enhanced in growth-stimulated FELC than in resting ones. On the other hand transition from the quiescent to the proliferative state was accompanied by a decrease in the activity of poly(ADP-ribose) polymerase. A decrease in poly(ADP-ribose) polymerase activity was also found in differentiated cells in contrast to controls.
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