17β-Estradiol Modulates SIRT1 and Halts Oxidative Stress-Mediated Cognitive Impairment in a Male Aging Mouse Model
Mehtab Khan,
Rahat Ullah,
Shafiq Ur Rehman,
Shahid Ali Shah,
Kamran Saeed,
Tahir Muhammad,
Hyun Young Park,
Myeung Hoon Jo,
Kyonghwan Choe,
Bart P.F. Rutten,
Myeong Ok Kim
Affiliations
Mehtab Khan
Division of Life sciences and Applied Life Science (BK 21plus), College of Natural Science, Gyeongsang National University, Jinju 52828, Korea
Rahat Ullah
Division of Life sciences and Applied Life Science (BK 21plus), College of Natural Science, Gyeongsang National University, Jinju 52828, Korea
Shafiq Ur Rehman
Division of Life sciences and Applied Life Science (BK 21plus), College of Natural Science, Gyeongsang National University, Jinju 52828, Korea
Shahid Ali Shah
Division of Life sciences and Applied Life Science (BK 21plus), College of Natural Science, Gyeongsang National University, Jinju 52828, Korea
Kamran Saeed
Division of Life sciences and Applied Life Science (BK 21plus), College of Natural Science, Gyeongsang National University, Jinju 52828, Korea
Tahir Muhammad
Division of Life sciences and Applied Life Science (BK 21plus), College of Natural Science, Gyeongsang National University, Jinju 52828, Korea
Hyun Young Park
Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience (MHeNS), Medical Center (MUMC+), Faculty of Health, Medicine and Life Sciences, Maastricht University, European Graduate School of Neuroscience (EURON), 6229ER Maastricht, The Netherlands
Myeung Hoon Jo
Division of Life sciences and Applied Life Science (BK 21plus), College of Natural Science, Gyeongsang National University, Jinju 52828, Korea
Kyonghwan Choe
Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience (MHeNS), Medical Center (MUMC+), Faculty of Health, Medicine and Life Sciences, Maastricht University, European Graduate School of Neuroscience (EURON), 6229ER Maastricht, The Netherlands
Bart P.F. Rutten
Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience (MHeNS), Medical Center (MUMC+), Faculty of Health, Medicine and Life Sciences, Maastricht University, European Graduate School of Neuroscience (EURON), 6229ER Maastricht, The Netherlands
Myeong Ok Kim
Division of Life sciences and Applied Life Science (BK 21plus), College of Natural Science, Gyeongsang National University, Jinju 52828, Korea
Oxidative stress has been considered the main mediator in neurodegenerative disease and in normal aging processes. Several studies have reported that the accumulation of reactive oxygen species (ROS), elevated oxidative stress, and neuroinflammation result in cellular malfunction. These conditions lead to neuronal cell death in aging-related neurodegenerative disorders such as Alzheimer’s disease (AD) and Parkinson’s disease. Chronic administration of d-galactose (d-gal) for a period of 10 weeks causes ROS generation and neuroinflammation, ultimately leading to cognitive impairment. In this study, we evaluated the estrogen receptor α (ERα)/silent mating type information regulation 2 homolog 1 (SIRT1)-dependent antioxidant efficacy of 17β-estradiol against d-gal-induced oxidative damage-mediated cognitive dysfunction in a male mouse model. The results indicate that 17β-estradiol, by stimulating ERα/SIRT1, halts d-gal-induced oxidative stress−mediated JNK/NF-ҡB overexpression, neuroinflammation and neuronal apoptosis. Moreover, 17β-estradiol ameliorated d-gal-induced AD-like pathophysiology, synaptic dysfunction and memory impairment in adult mouse brains. Interestingly, inhibition of SIRT1 with Ex527 (a potent and selective SIRT1 inhibitor) further enhanced d-gal-induced toxicity and abolished the beneficial effect of 17β-estradiol. Most importantly, for the first time, our molecular docking study reveals that 17β-estradiol allosterically increases the expression of SIRT1 and abolishes the inhibitory potential of d-ga. In summary, we can conclude that 17β-estradiol, in an ERα/SIRT1-dependent manner, abrogates d-gal-induced oxidative stress−mediated memory impairment, neuroinflammation, and neurodegeneration in adult mice.
