DOI: 10.1111/j.1432-1033.1979.tb04225.x. The Involvement of Poly(ADP‐ribose) Polymerase in the Degradation of NAD Caused by γ‐Radiation and <i>N</i>‐Methyl‐<i>N</i>‐Nitrosourea

The Involvement of Poly(ADP‐ribose) Polymerase in the Degradation of NAD Caused by γ‐Radiation and N‐Methyl‐N‐Nitrosourea

10.1111/j.1432-1033.1979.tb04225.x

Crossref journal-article

Wiley

European Journal of Biochemistry (311)

Abstract

Both N‐methylN‐nitrosourea and γ‐radiation lower cellular NAD in mouse leukaemia cells (L‐1210) in a dose‐dependent way. The minimum NAD level is reached 2 h after a brief exposure to N‐methyl‐N‐nitrosourea, but within 15 min of y‐irradiation. The cells remain metabolically active; they are able to recover their control NAD levels and are impermeable to trypan blue.Several inhibitors of poly(ADP‐ribose) polymerase inhibit the drop in cellular NAD caused by these two agents: 2 mM 5‐methylnicotinamide, 1 mM theophylline or 1 mM theobromine inhibit the effect of N‐methyl‐N‐nitrosourea on cellular NAD level; 200 uM thymidine, 500 uM 5‐methyl‐nicotinamide, 500 αM theophylline and 500 αM theobromine prevent the lowering of cellular NAD by y‐irradiation. The extent to which the drop in cellular NAD is inhibited is dependent on both the concentration of cytotoxic agent and of polymerase inhibitor. Caffeine will inhibit the drop in NAD but only at 10 mM, while nicotonic acid is ineffective even at this dose.The activity of poly(ADP‐ribose) polymerase in permeabilized cells immediately after y‐radiation increases with dose up to 12 krad, giving a maximal 3.4‐fold stimulation of the enzyme activity, whereas the degradation of NAD under conditions optimal for NAD glycohydrolase does not change. The activity of the polymerase shows a close temporal correlation with the NAD drop following both γ‐radiation and N‐methyl‐N‐nitrosourea. The enzyme activity is maximal when the NAD content is decreasing at the highest rate and has returned to normal levels when it ceases falling.In permeabilized cells we can distinguish poly(ADP‐ribose) polymerase and NAD glycohydrolase activity by their differential response to inhibitors. The polymerase is sensitive to 5‐methylnicotin‐amide, theophylline, theobromine and thymidine; the NAD glycohydrolase is sensitive to 5‐methyl‐nicotinamide and theophylline, but not to theobromine and thymidine.We propose that the decrease in cellular NAD level produced by y‐radiation and by N‐methyl‐N‐nitrosourea is caused by an increased flux through poly(ADP‐ribose) mediated by an increased activity of poly(ADP‐ribose) polymerase. This consequently lowers the cellular NAD level. This hypothesis implies an involvement of (ADP‐ribose)n in the cellular response to cytotoxic drugs.

Bibliography

SKIDMORE, C. J., DAVIES, M. I., GOODWIN, P. M., HALLDORSSON, H., LEWIS, P. J., SHALL, S., & ZIAâEE, A. (1979). The Involvement of Poly(ADPâribose) Polymerase in the Degradation of NAD Caused by Î³âRadiation and NâMethylâNâNitrosourea. European Journal of Biochemistry, 101(1), 135â142. Portico.

Authors 7

Christopher J. SKIDMORE (first)
Margaret I. DAVIES (additional)
Patricia M. GOODWIN (additional)
Haraldur HALLDORSSON (additional)
Pamela J. LEWIS (additional)
Sydney SHALL (additional)
Abed‐Ali ZIA'EE (additional)

References 34 Referenced 211

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10.1016/0014-4827(66)90277-1 / Exp. Cell Res. by Campagnari F. (1966)
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Dates

Type	When
Created	20 years, 5 months ago (March 3, 2005, 2:38 p.m.)
Deposited	1 year, 9 months ago (Nov. 23, 2023, 8:55 a.m.)
Indexed	3 weeks ago (Aug. 2, 2025, 12:32 a.m.)
Issued	45 years, 9 months ago (Nov. 1, 1979)
Published	45 years, 9 months ago (Nov. 1, 1979)
Published Online	17 years, 1 month ago (June 28, 2008)
Published Print	45 years, 9 months ago (Nov. 1, 1979)

Funders 0

None

BibTeX

@article{SKIDMORE_1979, title={The Involvement of Poly(ADP‐ribose) Polymerase in the Degradation of NAD Caused by γ‐Radiation and N‐Methyl‐N‐Nitrosourea}, volume={101}, ISSN={1432-1033}, url={http://dx.doi.org/10.1111/j.1432-1033.1979.tb04225.x}, DOI={10.1111/j.1432-1033.1979.tb04225.x}, number={1}, journal={European Journal of Biochemistry}, publisher={Wiley}, author={SKIDMORE, Christopher J. and DAVIES, Margaret I. and GOODWIN, Patricia M. and HALLDORSSON, Haraldur and LEWIS, Pamela J. and SHALL, Sydney and ZIA’EE, Abed‐Ali}, year={1979}, month=nov, pages={135–142} }

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