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Effect of hyperoxia on reduced glutathione in alveolar macrophages and polymorphonuclear leukocytes
Abstract:
Reduced glutathione (GSH) protects alveolar macrophages (AMs) and polymorphonuclear leukocytes (PMNs) against oxidative damage. To obtain further knowledge of the oxygen toxicity we determined GSH in AMs and PMNs of guinea pigs exposed to an oxygen concentration of 85% for up to 90 h. AMs and PMNs from control animals contained 17.93 and 11.67 nmol GSH/mg protein, respectively. During the exposure to a FIO2 of 85% we observed a significant continuous increase of GSH in AMs. By 90 h of oxygen exposure, AMs contained 51.22 nmol GSH/mg protein. In addition, the protein content of AMs decreased during hyperoxia. In contrast, no change of the GSH amount and protein content was detectable in PMNs. The increase of GSH in AMs could serve as an adaptation of the cells to hyperoxia. The lack of the GSH increase in PMNs could be due to the different oxygen concentrations between the lung and the peritoneal cavity. The greater GSH content in AMs may account for the difference between these cells in their susceptibility to oxidant injury.
Insights
Reduced glutathione (GSH) increases in alveolar macrophages (AMs) during oxygen exposure, suggesting adaptation. Polymorphonuclear leukocytes (PMNs) showed no change, potentially due to differing oxygen levels and varying susceptibility to oxidative damage.
Area of Science:
- Cellular biology
- Biochemistry
- Toxicology
Background:
- Reduced glutathione (GSH) is crucial for protecting cells from oxidative damage.
- Alveolar macrophages (AMs) and polymorphonuclear leukocytes (PMNs) are key immune cells susceptible to oxidative stress.
Purpose of the Study:
- To investigate the changes in GSH levels in AMs and PMNs of guinea pigs exposed to hyperoxia (85% oxygen).
- To understand the cellular adaptation mechanisms against oxygen toxicity.
Main Methods:
- Guinea pigs were exposed to 85% oxygen for up to 90 hours.
- GSH levels and protein content were measured in AMs and PMNs.
- Control groups were used for comparison.
Main Results:
- GSH levels significantly increased in AMs during oxygen exposure, reaching 51.22 nmol/mg protein by 90 hours.
- AM protein content decreased during hyperoxia.
- PMNs showed no significant changes in GSH levels or protein content.
Conclusions:
- The observed increase in GSH in AMs suggests an adaptive response to hyperoxia.
- The lack of GSH increase in PMNs may be related to different oxygen environments and cellular susceptibility.
- Differential GSH content may explain varying susceptibility of AMs and PMNs to oxidant injury.