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Khalifa 2017 Physiol Rep
Additional label PBI-Shredder  + , Amplex UltraRed  +
Coupling states LEAK  + , OXPHOS  + , ET  +
Diseases Aging;senescence  + , Cardiovascular  + , Other  +
Has abstract Sex-specific differences in mitochondrial
Sex-specific differences in mitochondrial function and free radical homeostasis are reported in the context of aging but not well-established in pathogeneses occurring early in life. Here, we examine if sex disparity in mitochondria function, morphology, and redox status starts early and hence can be implicated in sexual dimorphism in cardiac as well as neurological disorders prevalent at young age. Although mitochondrial activity in the heart did not significantly vary between sexes, female brain exhibited enhanced respiration and higher reserve capacity. This was associated with lower H<sub>2</sub>O<sub>2</sub> production in female cardiac and brain tissues. Using transmission electron microscopy, we found that the number of female cardiac mitochondria is moderately greater (117 ± 3%, P = 0.049, N = 4) than male's, which increased significantly for cortical mitochondria (134 ± 4%, P = 0.001, N = 4). However, male's cardiac mitochondria exhibited fragmented, circular, and smaller mitochondria relative to female's mitochondria, while no morphologic sex-dependent differences were observed in cortical mitochondria. No sex differences were detected in Nox2 and Nox4 proteins or O2-consuming/H2O2-producing activities in brain homogenate or synaptosomes. However, a strong trend of increased EPR-detected NOX superoxide in male synaptosomes hinted at higher superoxide dismutase activity in female brains, which was confirmed by two independent protocols. We also provide direct evidence that respiring mitochondria generally produce an order-of-magnitude lower reactive oxygen species (ROS) proportions than currently estimated. Our results indicate that sex differences in mitochondrial biogenesis, bioenergetics, and morphology may start at young age and that sex-dependent SOD capacity may be responsible for differences in ROS homeostasis in heart and brain. © 2017 The Authors. Physiological Reports published by Wiley Periodicals, Inc. on behalf of The Physiological Society and the American Physiological Society.
ty and the American Physiological Society.  +
Has editor [[Kandolf G]]  +
Has info [https://www.ncbi.nlm.nih.gov/pubmed/28325789 PMID: 28325789 Open Access]  +
Has publicationkeywords Brain  + , EPR  + , Heart  + , Mitochondria  + , NADPH Oxidase  + , ROS  + , Sex  + , Superoxide dismutase  + , Synaptosome  + , Amplex Red  +
Has title Khalifa AR, Abdel-Rahman EA, Mahmoud AM, A
Khalifa AR, Abdel-Rahman EA, Mahmoud AM, Ali MH, Noureldin M, Saber SH, Mohsen M, Ali SS (2017) Sex-specific differences in mitochondria biogenesis, morphology, respiratory function, and ROS homeostasis in young mouse heart and brain. Physiol Rep 5. pii: e13125.
art and brain. Physiol Rep 5. pii: e13125.  +
Instrument and method Oxygraph-2k  + , O2k-Fluorometer  +
Mammal and model Mouse  +
MiP area Respiration  + , mt-Biogenesis;mt-density  + , Gender  +
Pathways N  + , S  + , CIV  + , NS  + , ROX  +
Preparation Homogenate  +
Tissue and cell Heart  + , Nervous system  +
Was published by MiPNetLab EG Cairo Ali SS +
Was published in journal Physiol Rep +
Was published in year 2017  +
Was written by Khalifa ARM + , Abdel-Rahman EA + , Mahmoud AM + , Ali MH + , Noureldin M + , Saber SH + , Mohsen M + , Ali SS +
Categories Publications
Modification date
"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by Semantic MediaWiki.
08:06:37, 9 April 2018  +
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