What causes lipid peroxidation?

Generally, lipid peroxidation occurs when a hydroxyl radical abstracts an electron from an unsaturated fatty acid. This creates an unstable lipid radical, which can react with oxygen, forming a fatty acid peroxyl radical. Repeated cycles of lipid peroxidation can cause serious damage to cell membranes.

What effect do high levels of reactive oxygen species have on proteins lipids DNA and other macromolecules?

ROS can randomly react with lipids, proteins and nucleic acids causing oxidative stress and damage in these macromolecules, leading to pathogenesis of age-related and chronic diseases, which include cancer, cardiovascular disease, diabetes, chronic inflammation, and neurodegenerative disorders [6,7,8,9,10,11].

What is the impact of ROS on lipids?

At high levels, ROS can easily react with membrane lipids, causing an alteration of membrane permeability; with DNA, causing damage and genomic instability; with proteins, causing oxidative modifications which might result in catalytically less active enzymes or proteins more susceptible to proteolytic degradation.

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How reactive oxygen species damage DNA?

Mechanisms of oxidative damage to DNA bases. Of the reactive oxygen species, the highly reactive hydroxyl radical (•OH) reacts with DNA by addition to double bonds of DNA bases and by abstraction of an H atom from the methyl group of thymine and each of the C-H bonds of 2′-deoxyribose (2).

What causes peroxidation?

Lipid peroxidation is a process generated naturally in small amounts in the body, mainly by the effect of several reactive oxygen species (hydroxyl radical, hydrogen peroxide etc.). It can also be generated by the action of several phagocytes.

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Is ROS good or bad?

ROS are predominantly beneficial to cells, supporting basic cellular processes and viability, and oxidative stress is only an outcome of a deliberate activation of a physiological cell death pathway. Maintaining a basal level of ROS in cells is essential for life.

How does ROS cause cell death?

ROS/RNS can cause cell death by nonphysiological (necrotic) or regulated pathways (apoptotic). The mechanisms by which ROS/RNS cause or regulate apoptosis typically include receptor activation, caspase activation, Bcl-2 family proteins, and mitochondrial dysfunction.

How do reactive oxygen species affect lipids?

Lipid peroxidation by reactive oxygen species (ROS) during oxidative stress is non-enzymatic damage that affects the integrity of biological membrane, and alters the fluidity and permeability.

What is lipid ROS?

Reactive oxygen species- (ROS-) induced lipid peroxidation plays a critical role in cell death including apoptosis, autophagy, and ferroptosis. A highly evolved sophisticated antioxidant system exists that acts to protect the cells from oxidative damage.

What are the effects of ROS on DNA?

At high levels, ROS can lead to impaired physiological function through cellular damage of DNA, proteins, lipids, and other macromolecules, which can lead to certain human pathologies including cancers, neurodegenerative disorders, and cardiovascular disease, as well as aging.

How do reactive oxygen species cause mutation?

ROS can damage DNA and the division of cells with unpaired or misrepaired damage leads to mutations. The majority of mutations induced by ROS appear to involve modification of guanine, causing G→T transversions [22-25].

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