Thymus as a target tissue of glucocorticoid action: what are the consequences of glucocorticoids thymectomy?
Glucocorticoids represent the most powerful endogenous anti-inflammatory and immunosuppressive effectors, interfering with virtually every step of immunoinflammatory responses. Glucocorticoids are often the most effective therapy in the prevention or suppression of inflammation and other immunologically mediated processes, but their use is limited by systemic side effects induced by the over-production of reactive oxygen species, causing dysregulation of physiological processes. The thymus is an organ with both endocrine and immune functions. Glucocorticoids induce thymocyte apoptosis, causing a profound reduction in thymic mass and volume and inducing hormonal thymectomy. The clinical aspects of glucocorticoid thymectomy are not under enough investigation. These unwanted systemic side effects may be the consequence of prolonged therapeutic application of glucocorticoids and prolonged or chronic activation of the hypothalamic-pituitary adrenal axis, which may lead to increased and prolonged secretion of glucocorticoids. This review will discuss the metabolic effects of glucocorticoids in the context of thymic physiology asthe primary sex hormone-responsive organ.
Bjelaković
Gordana
G
Institute of Biochemistry, CC Nis Faculty of Medicine, University of Nis, Serbia. bjelakovic@junis.ni.ac.yu
Stojanovic
Ivana
I
Jevtovic-Stoimenov
Tatjana
T
Pavlović
Dusica
D
Kocić
Gordana
G
Kamenov
Borisav
B
Saranac
Ljiljana
L
Nikolić
Jelenka
J
Bjelaković
Bojko
B
Sokolović
Dusan
D
Basić
Jelena
J
D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D005938:Glucocorticoids / Q000096:biosynthesis / Q000494:pharmacology*; D012739:Gonadal Steroid Hormones / Q000096:biosynthesis / Q000494:pharmacology; D006066:Gonads / Q000502:physiology; D006801:Humans; D007030:Hypothalamo-Hypophyseal System / Q000502:physiology; D010913:Pituitary-Adrenal System / Q000502:physiology; D013601:T-Lymphocytes / Q000166:cytology / Q000187:drug effects; D013950:Thymus Gland / Q000187:drug effects* / Q000502:physiology
D005938:Glucocorticoids; D012739:Gonadal Steroid Hormones