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[Effect of the incubation medium pH on damage to macrophages plasma membranes]
Abstract:
In this paper we showed the pH-dependent change in the sensitivity of the membranes of murine peritoneal macrophages to UV-radiation. This relationship is discussed in terms of lipid bilayer membrane stability modification to the action of ROS and lipid peroxidation process (LPP) at different pH. Iron-ascorbate reinforced LPP also led to pH-dependent membranes damage. The increase of the cells incubation medium temperature up to 37 degrees C, which also stimulated LPP, did not change the picture of the pH-dependent damage. Decrease of the incubation medium pH did not reduce H2O2-induced cell damage. Increase of the pH intensified the cells damage.
Insights
The pH of the environment significantly affects macrophage membrane sensitivity to UV radiation and hydrogen peroxide damage. Higher pH levels intensify cell damage, while lower pH levels do not reduce it.
Area of Science:
- Cell biology
- Biochemistry
- Membrane biophysics
Context:
- Murine peritoneal macrophages are key immune cells.
- Cell membrane integrity is crucial for macrophage function.
- Reactive oxygen species (ROS) and lipid peroxidation (LPP) are implicated in cellular damage.
Purpose:
- To investigate the influence of pH on the UV-radiation sensitivity of macrophage membranes.
- To explore the role of pH in modulating membrane stability against ROS and LPP.
- To understand the combined effects of pH, temperature, and oxidative stress on macrophage damage.
Summary:
- This study demonstrates a clear pH-dependent alteration in the sensitivity of murine peritoneal macrophage membranes to UV radiation.
- The observed relationship is attributed to pH-mediated modifications in lipid bilayer stability, affecting susceptibility to ROS and LPP.
- Iron-ascorbate induced LPP also exhibited pH-dependent membrane damage, a pattern unaffected by a temperature increase to 37°C.
- Interestingly, decreased extracellular pH did not mitigate H2O2-induced cell damage, whereas increased pH exacerbated it.
Impact:
- Provides insights into the mechanisms of oxidative stress and UV damage in immune cells.
- Highlights the critical role of extracellular pH in cellular response to environmental stressors.
- Informs potential therapeutic strategies targeting macrophage function in inflammatory and disease conditions.
