生物化学技术

In 2002, mitochondrial aldehyde dehydrogenase (ALDH-2) was identified as an organic nitrate bioactivating enzyme. This so-called nitrate reductase activity denitrates nitroglycerin (glycerol trinitrate) to its 1,2-glycerol dinitrate metabolite and nitrite. This reac ...

We expose methods for in vivo assessment of oxygen, nitric oxide (NO), and reactive oxygen species (ROS)/reactive nitrogen species (RNS), in the microcirculation during normoxia and hypoxia. We provide an example of the related mechanisms of ROS/RNS and oxygen level in the process of regulat ...

Although the healthcare field is increasingly aware of the importance of free radicals and oxidative stress, screening and monitoring has not yet become a routine test, since, dangerously, there are no symptoms of this condition. Therefore, in very few cases is oxidative stress addressed. P ...

Since lipofuscin, the so-called “aging pigment”, turned out to play a fundamental role in the aging process, particularly in the postmitotic senescence of muscle or neuronal cells, it became a focus of aging and stress research. During normal aging, lipofuscin accumulates in a nearly linear wa ...

Fluorescence-activated flow cytometry analyses were developed for determination of reactive oxygen species (ROS) formation and membrane lipid peroxidation in live spermatozoa loaded with, respectively, hydroethidine (HE) or the lipophilic probe 4,4-difluoro-5-(4-ph ...

Metabolic monitoring at the cellular level in live tissues is important for understanding cell function, disease processes, and potential therapies. Multiphoton imaging of the relative amounts of NADH and FAD (the primary electron donor and acceptor, respectively, in the electron t ...

The change produced by oxidative stress on proteins (cross-links, backbone cleavage, amino acid modification) generates structural changes with a wide range of consequences such as increased propensity to the aggregation or proteolysis, altered immunogenicity and frequent ...

Cells constantly generate reactive oxygen species (ROS) during aerobic metabolism. The ROS generation plays an important protective and functional role in the immune system. The cell is armed with a powerful antioxidant defense system to combat excessive production of ROS. Oxidative ...

Tests measuring the combined antioxidant effect of the nonenzymatic defenses in biological fluids may be useful in providing an index of the organism’s capability to counteract reactive species known as pro-oxidants, resist oxidative damage, and combat oxidative stress-related ...

Our group recently proposed OXY-SCORE, a summary index of oxidative stress, computed by combining plasma free and total malondialdehyde (F- and T-MDA), glutathione in disulphide/reduced forms (GSSG/GSH), α- and γ-tocopherol (TH), urine isoprostanes (iPF2α-III) levels, and plasma ind ...

Prostaglandin endoperoxide synthase (PGH synthase), also known as cyclooxygenase (COX), was identified over 30 years ago and is the key enzyme in the pathway by which arachidonic acid is converted to the range of biologically active lipid mediators known as the prostanoids that participa ...

Erythrocytes are readily available cells and a good model system to study the health status of individuals with pathologic complications. It can also serve as a meaningful target to study toxicant/xenobiotic-induced damages. We have prepared different concentrations of a carbamate ...

The major component of mitochondrial electrochemical potential gradient of protons is the mitochondrial membrane potential (ΔΨ), and hence it is a suitable parameter for assessment of mitochondrial function. Dissipation of the mitochondrial membrane potential causes unco ...

Reactive oxygen/nitrogen species (ROS/RNS) have been increasingly recognized as important mediators and play a number of critical roles in cell injury, metabolism, disease pathology, diagnosis, and clinical treatment. Electron paramagnetic resonance (EPR) spectroscopy e ...

Oxidative stress is functionally involved in the pathophysiology of lung diseases including asthma and chronic obstructive pulmonary disease. 8-Isoprostane, which is derived from free radical-catalyzed peroxidation of arachidonic acid, is one of the most reliable biomarke ...

Accumulated evidences indicate that reactive oxygen species (ROS) are involved in the pathophysiology of aging process. Antioxidants are believed to play an important role in the defense system to counteract ROS in the body. While excess hydrophilic antioxidants can be excreted easi ...

Recent epidemiological studies have shown that there may be a link between oxidative stress and the development of several types of chronic diseases. Studies have also shown that diets rich in fruits and vegetables may decrease the incidence of cancer and other chronic diseases. The antioxi ...

Advances in understanding the neurodegenerative pathologies are creating new opportunities for the development of neuroprotective therapies, such as antioxidant food factors, lifestyle modification and drugs. However, the biomarker by which the effect of the agent on neurod ...

The present study deals with the scientific evaluation of antioxidant potential of aqueous extract of Trichosanthes dioica fruits on diabetes-induced oxidative stress of diabetic rats. The most effective dose of mg/kg bw of fruit aqueous extract was given orally to diabetic rats for 30 da ...

There are many in vitro methods for evaluating antioxidant activity. In this chapter, we describe an operationally simple cell-based assay, oxidative hemolysis inhibition assay (OxHLIA). OxHLIA is based on inhibition of free radical-induced membrane damage in erythrocytes by ant ...