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Rapid Quantification of Oxidized and Reduced Forms of Glutathione Using Ortho -phthalaldehyde in Cultured Mammalian Cells In Vitro
Published on: June 28, 2024
In vitro effect of reduced glutathione on platelet function
L Pacchiarini1, A Tua, G Grignani
1Department of Internal Medicine, University of Pavia, IRCCS Policlinico San Matteo, Italy.
Haematologica
|November 1, 1996
Summary
Reduced glutathione (GSH) inhibits platelet activation at higher concentrations. This suggests GSH plays a physiological role in regulating platelet reactivity, impacting aggregation and mediator release.
Area of Science:
- Biochemistry
- Hematology
- Pharmacology
Background:
- Reactive oxygen species (ROS) are implicated in platelet reactivity.
- Free-radical scavengers may inhibit platelet activation.
- Reduced glutathione (GSH) is a key antioxidant with potential roles in platelet function.
Purpose of the Study:
- To investigate the effect of reduced glutathione (GSH) on platelet functions.
- To determine GSH's impact on platelet aggregation and mediator release induced by ADP, collagen, and platelet-activating factor (PAF).
Main Methods:
- Platelet aggregation assessed using Born's method.
- Thromboxane B2 (TxB2) and platelet-derived growth factor (PDGF) levels measured via radioimmunoassay.
Main Results:
- GSH significantly inhibited ADP- and PAF-induced platelet aggregation, TxB2, and PDGF release at concentrations of 3 mM and 10 mM.
- Collagen-induced platelet activation was less sensitive to GSH; aggregation was not significantly reduced, but TxB2 and PDGF release were inhibited at higher GSH concentrations.
- The half-maximal inhibitory concentration (IC50) for GSH varied depending on the agonist, with lower values for ADP and PAF compared to collagen.
Conclusions:
- Reduced glutathione (GSH) demonstrates inhibitory effects on platelet activation.
- GSH may function as a physiological regulator of platelet reactivity.
- These findings highlight GSH's potential role in managing pathological platelet activation.
