Abstract
Heme oxygenase 1 (HO-1) expression is recognized as a marker of cellular response to oxidative stress; since ageing is believed to be related to oxidative “wear and tear”, HO-1 may represent a candidate biomarker of ageing. In our study, the hepatic expression of HO-1 mRNA, evaluated by RT-PCR in 2.5–24 month-old rats, was higher at 6 months than at 2.5 months of age, but thereafter increased no further: on the contrary, a declining trend was observed. However, while 2.5 month-old rats responded to acute ethanol intoxication by displaying increased expression of liver HO-1 mRNA, and 6 month-old rats exhibited a mild response, 18 month-old rats did not show any response; this phenomenon suggests that during development and ageing the transcriptional response to oxidative stress decreases. In our view, the finding that HO-1 expression did not increase progressively during ageing may be explained by a decreased transcriptional ability to respond to stress in older animals, rather than by a reduction in oxidative stress.
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Abbreviations
- HO:
-
Heme oxygenase
- HSP:
-
Heat shock protein
- MDA:
-
Malondialdehyde
- HNE:
-
4-Hydroxy-2-nonenal
- TBA:
-
Thiobarbituric acid
- TCA:
-
Trichloroacetic acid
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Acknowledgements
This work has been supported by Grants from the University of Genova, MIUR PRIN #2004063943_001 and #2004068552_002, and FIRB 2001 #RBAU01JBH8_003.
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Stefania Patriarca and Anna Lisa Furfaro equally contributed to this paper.
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Patriarca, S., Furfaro, A.L., Cosso, L. et al. Heme oxygenase 1 expression in rat liver during ageing and ethanol intoxication. Biogerontology 8, 365–372 (2007). https://doi.org/10.1007/s10522-006-9079-x
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DOI: https://doi.org/10.1007/s10522-006-9079-x