Concept encyclopediaMetabolism
Free radicals
reactive oxygen species, ROS, oxidative stress
Free radicals are reactive molecular fragments that occur even in healthy cells, and can damage the cell. When unsaturated oils are exposed to free radicals they can create chain reactions of free radicals that spread the damage in the cell, and contribute to the cell's aging.
Free radicals, also known as reactive oxygen species (ROS), are highly reactive molecular fragments that can damage cells. They occur naturally in healthy cells, but can also be generated by external factors such as ionizing radiation . The rate of lipid peroxidation, a process in which free radicals damage cell membranes, is dependent on the concentration of the promoter, but is suppressed by higher concentrations of ascorbate . Formate, a hydroxyl radical scavenger, can inhibit the peroxidation process promoted by ionizing radiation .
Evidence suggests that ROS are involved in primary pathological mechanisms, particularly in response to extraneous physical or chemical perturbations such as radiation . Hydroxyl radicals, a type of ROS, are generated by ionizing radiation and can indiscriminately attack neighboring molecules . The biological response to radiation may be modulated by alterations in factors affecting cellular antioxidant status and the availability of activating mechanisms .
The tau protein has been shown to have protective effects against ROS, and its lack can cause serious neurodegenerative changes . Administering an antioxidant, such as NAC, can protect against ROS in a manner similar to the tau protein, confirming its role in lipid peroxidation . Excessive lipid accumulation, such as that caused by a low-carb/high-fat diet, can lead to ROS and contribute to neurodegenerative diseases like Alzheimer's .
Mitochondrial dysfunction is a major cause of cardiovascular disease (CVD), and oxidative stress downstream of mitochondrial dysfunction is a key mechanism in the development of CVD . The cellular link between fatty acids and ROS is essentially the mitochondrion, a key organelle for the control of insulin secretion . Mitochondria are the main source of ROS and are also the primary target of oxidative attacks .
In cancer, ROS derived mostly from fat oxidation drive cancer growth and metastases . The majority of ROS are generated not during normal oxidative metabolism, but during reverse electron flow, which occurs when there is a functional or physical block at one or more of the electron transport chain (ETC) complexes .
Free radicals can damage cells by creating chain reactions of free radicals that spread the damage in the cell, contributing to the cell's aging .
People also ask
- What causes the generation of free radicals in cells?The corpus describes that free radicals can be generated by external factors such as ionizing radiation, and also naturally in healthy cells.
- Can antioxidants protect against free radical damage?Peat argued that administering an antioxidant, such as NAC, can protect against free radicals in a manner similar to the tau protein.
- What is the relationship between mitochondrial dysfunction and free radical production?The cellular link between fatty acids and free radicals is essentially the mitochondrion, a key organelle for the control of insulin secretion, and mitochondria are the main source of free radicals.