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Cytoskeletal oxidative changes lead to alterations of specific cell surface receptors
W Malorni1, G Rainaldi, R Rivabene
1Department of Ultrastructures, Istituto Superiore di Sanità, Rome, Italy.
Abstract:
Electron acceptors in biological systems, termed "oxidants", have been associated with numerous cytopathic conditions. In particular, oxygen-derived free radicals have been shown to induce various subcellular oxidative injuries which can lead to different types of pathologies. It has also been suggested that oxidative stress induced by xenobiotics can determine specific subcellular alterations in in vitro models. An oxidative imbalance in cells seems in fact to affect intracellular functions including the expression of some growth factor surface receptors. In this work, we observed a specific early alteration of the microfilament system and the microtubular network induced in K562 cells by oxidative stress. In particular, we hypothesize that oxidative imbalance could lead to an impairment of the expression of these receptors, such as transferrin receptors, via a modification of the cytoskeleton. This could represent a general mechanism by which a modification of receptor regulation can lead to cell aging, injury or death.
Insights
Oxidative stress damages cellular structures like the cytoskeleton, potentially impairing growth factor receptor expression. This mechanism may explain cell aging, injury, and death.
Area of Science:
- Cell Biology
- Biochemistry
- Pathology
Background:
- Oxidants and oxygen-derived free radicals cause cellular damage and pathologies.
- Xenobiotics can induce oxidative stress, leading to subcellular alterations.
- Oxidative imbalance affects intracellular functions, including growth factor receptor expression.
Purpose of the Study:
- To investigate the early effects of oxidative stress on the cytoskeleton in K562 cells.
- To explore the link between oxidative imbalance, cytoskeleton modification, and receptor expression.
Main Methods:
- Induction of oxidative stress in K562 cells.
- Observation of alterations in the microfilament system and microtubular network.
- Hypothesizing a mechanism involving cytoskeleton modification and receptor expression.
Main Results:
- Oxidative stress induced early alterations in the microfilament system and microtubular network.
- A hypothesis was proposed linking oxidative imbalance to impaired receptor expression via cytoskeleton changes.
Conclusions:
- Oxidative imbalance may impair the expression of receptors like transferrin receptors through cytoskeleton modification.
- This mechanism could be a general pathway leading to cell aging, injury, or death.