Deoxyguanosine

Publication Title: 
Free Radical Research

Previous studies have shown that glucose-6-phosphate dehydrogenase (G6PD)-deficient cells are under increased oxidative stress and undergo premature cellular senescence. The present study demonstrates that G6PD-deficient cells cultured under 3% oxygen concentration had an extended replicative lifespan, as compared with those cultured under atmospheric oxygen level. This was accompanied by a reduction in the number of senescence-associated beta-galactosidase (SA-beta-Gal) positive and morphologically senile cells at comparable population doubling levels (PDL).

Author(s): 
Ho, Hung-Yao
Cheng, Mei-Ling
Cheng, Pei-Fen
Chiu, Daniel Tsun-Yee
Publication Title: 
Acupuncture & Electro-Therapeutics Research

Diagnoses of bone marrow associated malignancies such as Acute & Chronic Lymphocytic Leukemia, Acute & Chronic Myelogenous (Myeloid) Leukemia, Hodgkin's Lymphoma & Non-Hodgkin's Lymphoma, and Multiple Myeloma are often missed without a blood test. However, in 2008, Omura Y reported several newly discovered organ representation areas that exist between the lower end of the eyebrows and upper end of the upper eyelid. This space was divided into 5 organ representation areas.

Author(s): 
Omura, Yoshiaki
O'Young, Brian
Jones, Marilyn
Nihrane, Abdalla
Duvvi, Harsha
Paluch, Kamila
Shimotsuura, Yasuhiro
Ohki, Motomu
Publication Title: 
Free Radical Biology & Medicine

The free radical, or oxidative stress, theory of aging proposes that the accumulation of oxidative cellular damage is a major contributor to the aging process and a key determinant of species longevity. This study investigates the oxidative stress theory in a novel model for aging research, the sea urchin. Sea urchins present a unique model for the study of aging because of the existence of species with tremendously different natural life spans, including some species with extraordinary longevity and negligible senescence.

Author(s): 
Du, Colin
Anderson, Arielle
Lortie, Mae
Parsons, Rachel
Bodnar, Andrea
Publication Title: 
The Journal of Nutrition

Restriction of energy intake (ER), without malnutrition of essential nutrients, has repeatedly been demonstrated to increase longevity in rodents. In the antioxidant theory of aging the lack of balance between the generation of free radicals and free radical scavenging was thought to be a main causal agent, in the aging process. From this point of view the antiaging effect induced by ER might be due to the lower rate of free-radical production and related damage induced by a lower metabolic rate. The antiaging effects of ER might also occur in humans.

Author(s): 
Velthuis-te Wierik, E. J.
van Leeuwen, R. E.
Hendriks, H. F.
Verhagen, H.
Loft, S.
Poulsen, H. E.
Van den Berg, H.
Publication Title: 
Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society

It is well documented that reactive oxygen species (ROS) are involved in the aetiology of age related diseases. Over the last decades, strong efforts have been made to identify antioxidants in human foods and numerous promising compounds have been detected which are used for the production of supplements and functional foods. The present paper describes the advantages and limitations of methods which are currently used for the identification of antioxidants. Numerous in vitro methods are available which are easy to perform and largely used in screening trials.

Author(s): 
Hoelzl, C.
Bichler, J.
Ferk, F.
Simic, T.
Nersesyan, A.
Elbling, L.
Ehrlich, V.
Chakraborty, A.
Knasm¸ller, S.
Publication Title: 
American Journal of Physiology. Endocrinology and Metabolism

Adiponectin, a physiologically active polypeptide secreted by adipocytes, shows insulin-sensitizing, anti-inflammatory, and antiatherogenic properties in rodents and humans. To assess the effects of chronic hyperadiponectinemia on metabolic phenotypes, we established three lines of transgenic mice expressing human adiponectin in the liver.

Author(s): 
Otabe, Shuichi
Yuan, Xiaohong
Fukutani, Tomoka
Wada, Nobuhiko
Hashinaga, Toshihiko
Nakayama, Hitomi
Hirota, Naotoshi
Kojima, Masayasu
Yamada, Kentaro
Publication Title: 
Psychoneuroendocrinology

Chronic psychological stress appears to accelerate biological aging, and oxidative damage is an important potential mediator of this process. However, the mechanisms by which psychological stress promotes oxidative damage are poorly understood. This study investigates the theory that cortisol increases in response to an acutely stressful event have the potential to either enhance or undermine psychobiological resilience to oxidative damage, depending on the body's prior exposure to chronic psychological stress.

Author(s): 
Aschbacher, Kirstin
O'Donovan, Aoife
Wolkowitz, Owen M.
Dhabhar, Firdaus S.
Su, Yali
Epel, Elissa
Publication Title: 
Journal of Biological Regulators and Homeostatic Agents

There is increasing evidence that psychosocial stress can be viewed as a system-wide derangement of cellular homeostasis, with heightened oxidative stress and triggered proinflammatory mechanisms. The aim of this study is twofold: a) to replicate findings that psychological stress increases oxidative damage and b) to determine whether a fermented papaya preparation known to exert significant protective antioxidant properties could buffer such increases in nuclear DNA damage while also inducing epigenetic protective mechanisms.

Author(s): 
Marotta, F.
Naito, Y.
Padrini, F.
Xuewei, X.
Jain, S.
Soresi, V.
Zhou, L.
Catanzaro, R.
Zhong, K.
Polimeni, A.
Chui, D. H.
Publication Title: 
The Journal of Investigative Dermatology

Solar UV radiation, in particular its UVB component, is the primary cause of many adverse biological effects, the most damaging of which is skin cancer. Here, we assessed the photochemopreventive effect of delphinidin, a major anthocyanidin present in many pigmented fruits and vegetables, on UVB-mediated responses in human immortalized HaCaT keratinocytes and SKH-1 hairless mouse skin. We found that pretreatment of cells with delphinidin (1-20 microM for 24 hours) protected against UVB (15-30 mJ/cm2, 24 hours)-mediated (i) decrease in cell viability and (ii) induction of apoptosis.

Author(s): 
Afaq, Farrukh
Syed, Deeba N.
Malik, Arshi
Hadi, Naghma
Sarfaraz, Sami
Kweon, Mee-Hyang
Khan, Naghma
Zaid, Mohammad Abu
Mukhtar, Hasan
Publication Title: 
Journal of the American College of Nutrition

OBJECTIVE: While tomato product supplementation, containing antioxidant carotenoids, including lycopene, decreases oxidative stress, the role of purified lycopene as an antioxidant remains unclear. Thus, we tested the effects of different doses of purified lycopene supplementation on biomarkers of oxidative stress in healthy volunteers.

Author(s): 
Devaraj, Sridevi
Mathur, Surekha
Basu, Arpita
Aung, Hnin H.
Vasu, Vihas T.
Meyers, Stuart
Jialal, Ishwarlal

Pages

Subscribe to RSS - Deoxyguanosine