Mol. Hum. Reprod. Advance Access originally published online on September 27, 2006
Molecular Human Reproduction 2006 12(11):655-660; doi:10.1093/molehr/gal080
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Age-dependent changes in the expression of superoxide dismutases and catalase are associated with ultrastructural modifications in human granulosa cells
1Department of Biomedical Sciences and Technologies, 2Center for Assisted Reproduction, 3Department of Basic and Applied Biology, University of LAquila, LAquila, 4Department of Biomorphology, Aging Research Center, Ce.S.I., Gabriele DAnnunzio University Foundation, Chieti-Pescara, 5Department of Obstetrics, Gynecology and Perinatology, S. Andrea Hospital, La Sapienza University, Rome and 6Department of Experimental Medicine, University of LAquila, LAquila, Italy
7 To whom correspondence should be addressed at: Department of Biomedical Sciences and Technologies, University of LAquila, Via Vetoio, 67100 LAquila, Italy. E-mail: ctatone{at}univaq.it
Limited knowledge exists about changes in follicle quality associated with age. The aim of this work was to investigate whether ageing may cause oxidative stress-mediated alterations in human granulosa cells (GCs) from periovulatory follicles. GCs employed in this study were obtained from follicular aspirates of 20 younger women (range 2732 years) and 20 older women (range 3841 years) undergoing an IVF treatment. Results obtained from comparative RTPCR analysis revealed that the mean relative levels of mRNAs coding for superoxide dismutases, Cu, ZnSOD (SOD1), MnSOD (SOD2) and catalase were significantly decreased in women
38 years (P < 0.05, Students t-test). These changes were associated with a reduced expression of SOD1, SOD2 and catalase at the protein level. When examined at an ultrastructural level, most of the GCs from this group showed defective mitochondria and fewer lipid droplets than those observed in the younger group. These results indicate that GCs from older patients suffer from age-dependent oxidative stress injury and are taken as an evidence for reduced defence against reactive oxygen species (ROS) in GCs during reproductive ageing.
Key words: antioxidant enzymes/gene expression/granulosa cells/mitochondria/reproductive ageing
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