Abstract
Background
Serum gamma-glutamyltransferase (GGT) is a liver enzyme involved in the metabolism of glutathione (GSH), a major antioxidant in humans. GGT is a risk factor for mortality in young and middle-aged individuals but this association has been poorly investigated in the elderly.
Methods
We studied the relationship between GGT and all-cause mortality and tested whether oxidized low-density lipoproteins (oxLDL) modify this association in a cohort of 1038 elderly individuals.
Results
During the observation time (median 9 years), 401 individuals died. In a Cox regression model adjusting for potential confounders, GGT was an independent risk factor for all-cause mortality [HR (20U/L increase in serum GGT): 1.11, 95% CI 1.02–1.21, P = 0.02]. Furthermore, increasing levels of oxLDL amplified the risk excess for all-cause mortality associated with GGT (P for the effect modification = 0.003).
Conclusions
In the elderly, serum GGT is an independent risk factor for all-cause mortality and circulating oxLDL amplify the magnitude of this association.
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Acknowledgements
This work was supported by the National Research Council of Italy (CNR), Research Project “Aging: molecular and technological innovations for improving the health of the elderly population” (Prot. MIUR 2867 25.11.2011). The funding of the study complies with Ethical Standards.
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All the authors declare no conflict of interest.
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The InCHIANTI study protocol met the criteria outlined in the Declaration of Helsinki and the Italian National Research Council on Aging ethics committee approved the study protocol in September 1998.
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Written informed consent was obtained from each participant by the InCHIANTI investigators.
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Spoto, B., D’Arrigo, G., Tripepi, G. et al. Serum gamma-glutamyltransferase, oxidized LDL and mortality in the elderly. Aging Clin Exp Res 33, 1393–1397 (2021). https://doi.org/10.1007/s40520-019-01391-4
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DOI: https://doi.org/10.1007/s40520-019-01391-4