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Related Experiment Video

Updated: Jul 12, 2026

Rapid Quantification of Oxidized and Reduced Forms of Glutathione Using Ortho -phthalaldehyde in Cultured Mammalian Cells In Vitro
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Glucocorticoids and oxidative stress.

G Bjelaković1, S Beninati, D Pavlović

  • 1Institute of Biochemistry, CC Nis, Faculty of Medicine, University of Nisg, Nis, Serbia. bjelakovic@junis.ni.ac.yu

Journal of Basic and Clinical Physiology and Pharmacology
|August 25, 2007
PubMed
Summary

Glucocorticoids (GC) can cause adverse effects like hypertension and depression by increasing oxidative stress. Tetrahydrobiopterin (BH4) is crucial for mitigating these harmful impacts, offering a potential therapeutic target.

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Area of Science:

  • Biomedical Science
  • Pharmacology
  • Endocrinology

Background:

  • Glucocorticoids (GC) are widely used to treat autoimmune diseases, allergies, and lymphoproliferative disorders.
  • GC therapy is often limited by adverse reactions, including cardiovascular issues, osteoporosis, and diabetes, stemming from GC excess.
  • Oxidative stress is increasingly recognized as a key factor in endothelial dysfunction and cardiovascular aging.

Purpose of the Study:

  • To investigate the role of oxidative stress in glucocorticoid-induced adverse effects.
  • To explore the impact of dexamethasone on reactive oxygen species (ROS) production and physiological dysregulation.
  • To examine the link between GC excess, reduced nitric oxide (NO) and serotonin/melatonin levels, and the involvement of tetrahydrobiopterin (BH4).

Main Methods:

  • The study focuses on the biochemical mechanisms underlying GC toxicity.
  • Analysis of oxidative stress markers and their correlation with GC-induced pathologies.
  • Investigation of the role of tetrahydrobiopterin (BH4) as a cofactor in nitric oxide synthesis.

Main Results:

  • Dexamethasone, a GC, induces overproduction of reactive oxygen species (ROS), leading to physiological dysregulation.
  • GC-induced hypertension is associated with reduced nitric oxide (NO) levels.
  • Excess GC levels correlate with depression due to decreased serotonin and melatonin, with tetrahydrobiopterin (BH4) being a common cofactor.

Conclusions:

  • Oxidative stress is a primary mechanism for glucocorticoid-induced adverse effects, particularly endothelial dysfunction and cardiovascular senescence.
  • Tetrahydrobiopterin (BH4) plays a critical role in synthesizing nitric oxide, serotonin, and melatonin, and its availability may be crucial for mitigating GC toxicity.
  • Targeting BH4 metabolism could offer a novel therapeutic strategy to counteract the detrimental effects of glucocorticoid excess.