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Oxidative stress is considered to be an underlying mechanism in the pathogenesis of many cellular degenerative processes. In this study, microRNAs (miRNAs) are examined as potential epigenetic regulators of the oxidative stress response. In an effort to identify miRNAs up- or down-regulated during oxidative stress, we conducted a microarray analysis to evaluate miRNA accumulation changes in Drosophila melanogaster exposed to hyperoxic versus normoxic conditions. Several miRNAs were further evaluated using qRT-PCR to determine their accumulation in whole bodies and heads as well as changes over extended hyperoxia exposures. Dme-miR-8, -11, and -970 were found to be up-regulated in both whole bodies and heads after 5 days hyperoxia exposure. Jaguar (jag), castor (cas), and derailed (drl) were identified as putative targets of these three miRNAs using miRNA target prediction algorithms. Reporter gene-based assays were used to examine the interaction of the miRNAs with the target mRNAs, and confirmed functional suppressive relationships between miR-11:cas and miR-970:drl, but not miR-8:jag. Cell-based assays were also used to assess the ability of candidate microRNAs to suppress expression of several different predicted target genes with known antioxidant activities: superoxide dismutase (Sod), heat shock protein cognate70-4 (Hsc70-4), sniffer (sni), thioredoxin-2 (trx-2), and catalase (cat). Sod was not significantly down-regulated by any miRNA, but mir-927:Hsc70-4, mir-964:Hsc70-4, mir-277:sni, mir-1013:trx-2, and mir-1012:cat interactions were all functionally verified in addition to some pairings having correlational accumulation/expression profiles under hyperoxic stress conditions.
MicroRNAs (miRNAs) are sm ...
This authoritative handbook covers all aspects of immunosenescence, with contributions from experts in the research and clinical areas. It examines methods and models for studying immunosenescence; genetics; mechanisms including receptors and signal transduction; clinical relevance in disease states including infections, autoimmunity, cancer, metabolic syndrome, neurodegenerative diseases, frailty and osteoporosis; and much more.
The editor of this volume, having research interests in the field of ROS production and the damage to cellular systems, has identified a number of enzymes showing ·OH scavenging activities details of which are anticipated to be published in the near future as confirmatory experiments are awaited. It is hoped that the information presented in this book on NDs will stimulate both expert and novice researchers in the field with excellent overviews of the current status of research and pointers to future research goals. Clinicians, nurses as well as families and caregivers should also benefit from the material presented in handling and treating their specialised cases. Also the insights gained should be valuable for further understanding of the diseases at molecular levels and should lead to development of new biomarkers, novel diagnostic tools and more effective therapeutic drugs to treat the clinical problems raised by these devastating diseases.
The molecular genetics of aging or life-span determination is an expanding field. One reason is because many people would consider it desirable if hu man life span could be extended. Indeed, it is difficult not to be fascinated by tales of the life and death of people who have succeeded in living a very long life. Because of this, we have placed at the head of this book the chapter by Perls et al. on Centenerians and the Genetics of Longevity. Perls and his coauthors convincingly argue that, while the average life expectancy might be mostly determined by environmental factors because the average person has an average genotype, extremely long life spans are genetically determined. Of course, studying humans to uncover the genetics of aging is not ideal, not so much because one cannot easily perform experiments as because they live such a long time. This is why most of this book describes the current state of research with model organisms such as yeast, worms, flies, and mice. J aswinski focuses on yeast and how metabolic activity and stress resistance affect the longevity of Saccharomyces cerevisiae. In the process, he discusses the concept of aging as applied to a unicellular organism such as yeast and the importance of metabolism and stress resistance for aging in all organisms.
Recent studies have indicated that epigenetic processes may play a major role in both cellular and organismal aging. These epigenetic processes include not only DNA methylation and histone modifications, but also extend to many other epigenetic mediators such as the polycomb group proteins, chromosomal position effects, and noncoding RNA. The topics of this book range from fundamental changes in DNA methylation in aging to the most recent research on intervention into epigenetic modifications to modulate the aging process. The major topics of epigenetics and aging covered in this book are: 1) DNA methylation and histone modifications in aging; 2) Other epigenetic processes and aging; 3) Impact of epigenetics on aging; 4) Epigenetics of age-related diseases; 5) Epigenetic interventions and aging: and 6) Future directions in epigenetic aging research. The most studied of epigenetic processes, DNA methylation, has been associated with cellular aging and aging of organisms for many years. It is now apparent that both global and gene-specific alterations occur not only in DNA methylation during aging, but also in several histone alterations. Many epigenetic alterations can have an impact on aging processes such as stem cell aging, control of telomerase, modifications of telomeres, and epigenetic drift can impact the aging process as evident in the recent studies of aging monozygotic twins. Numerous age-related diseases are affected by epigenetic mechanisms. For example, recent studies have shown that DNA methylation is altered in Alzheimer’s disease and autoimmunity. Other prevalent diseases that have been associated with age-related epigenetic changes include cancer and diabetes. Paternal age and epigenetic changes appear to have an effect on schizophrenia and epigenetic silencing has been associated with several of the progeroid syndromes of premature aging. Moreover, the impact of dietary or drug intervention into epigenetic processes as they affect normal aging or age-related diseases is becoming increasingly feasible.
In the past few years there has been the increased recognition that the effects of oxidative stress are not limited to the damage of cellular constituents. There is now evidence that reactive oxygen species (ROS) can alter cell function by acting upon the intermediates, or second messengers, in signal transductions. Such effects on signaling mechanisms probably account for the role of oxidative stress in inflammation, aging, and cancer. This volume brings together internationally recognized researchers in both the major areas covered by the book, oxidative stress and signal transduction. The work is organized in three sections. The first deals with the immediate cellular responses to oxidative stress and the production of second messengers. The second details the connection between second messengers and the gene. The third part looks more closely at the level of the gene.
Most biological pathways, physical and neurological properties are highly conserved between humans and Drosophila and nearly 75% of human disease-causing genes have a functional homologue in Drosophila. This volume provides recent advances in Drosophila models for various human diseases, with each chapter providing a review of studies involving Drosophila models, as well as detailed protocols commonly used in laboratories. Starting with a review of Drosophila’s value as a highly tractable model organism for studying human diseases, subsequent chapters present Drosophila models for specific human diseases. The book provides a useful resource for all scientists who are starting to use the Drosophila model in their studies, and for researchers working in the pharmaceutical industry and using new screening models to develop new medicines for various diseases.
This book consists of 3 volumes: Basic Science (Volume 1), Clinical Science (Volume 2) and Technology and Methodology (Volume 3). Volume 2 focuses on the clinical aspects of autophagy research, discussing the role of autophagy in neuropsychiatric disorders, the cardiovascular, immune, digestive and endocrine systems, as well as tumors, infection, the kidney, and the respiratory and hematological systems. It also addresses autophagy-related drug development. Written and edited by a team of 90 experts, and presenting the state of the art in autophagy research, this book is a valuable reference resource for researchers and clinicians alike. It can also be used as supplementary material for graduate students majoring in biology and medicine