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Clinical Neuroscience

SEPTEMBER 30, 2016

Stress-induced corticosterone rise maintain gastric mucosal integrity in rats

LUDMILA Filaretova, MARINA Myazina, TATIANA Bagaeva

Background - To investigate contribution of glucocorticoids to the maintenance of gastric mucosal integrity during stress we predominantly used ulcerogenic stress models. Using these models we demonstrated that glucocorticoids released in response to the ulcerogenic stimuli attenuated their harmful action on the gastric mucosa. Purpose - In the present study we hypothesized that mild stressors does not damage the gastric mucosa due to gastroprotective action of glucocorticoids released in response to these stressors. Methods - To verify the hypothesis the effects of normally non-ulcerogenic mild stimuli (15-30 min cold-restraint) on the gastric mucosal integrity have been studied under the circumstances of inhibition of the hypothalamic-pituitaryadrenocortical axis in rats. The hypothalamic-pituitary-adrenocortical axis was inhibited by: 1) fast inhibitory action of metyrapone, inhibitor glucocorticoid synthesis; 2) fast inhibitory action of NBI 27914, the selective antagonist of cortricotropin- releasing factor receptor type 1; 3) delayed inhibitory action of a single pharmacological dose of cortisol injected one week before the onset of stress stimulus. Results - Each of these pretreatments significantly decreased 15-30 min cold-restraint-produced corticosterone levels: 37.2±1 vs 22.5±1.2 (p<0.05) after metyrapone; 52.1±0.9 vs 41.4±1 (p<0.05) after NBI, and 64.2±4.2 vs 16.7±1.5 (p<0.05) after cortisol pretreatment. The inhibition of stress-induced corticosterone rise resulted in an ap - pearance of gastric lesions after the onset of these mild stressors in rats. Conclusions - The results suggest that in rats with inhibited stress-induced corticosterone rise normally non-ulcerogenic stimuli are transformed into ulcerogenic ones and confirm the hypothesis. The findings further support for the point of view that glucocorticoids released during acute stress are gastroprotective factors.

Clinical Neuroscience

MARCH 30, 2014

[PERSONAL RECOLLECTIONS OF DR. HANS SELYE AND OF HIS INSTITUT DE MÈDECINE ET DE CHIRURGIE EXPÈRIMENTALES (IMCE)]

MILAGROS Salas-Prato

[This article is a short personal recollection of Dr. Hans Selye (HS) and of his institute in order to show, first, why and how he influenced us; second, who he was as a person, human being, physician, scientist, professor, mentor; third, what was the structure and functioning of the Institut de mèdecine et chirurgie expèrimentales (IMCE) and fourth, what HS’ contributions and accomplishments were.]

Clinical Neuroscience

MARCH 30, 2014

[HANS SELYE 70 YEARS LATER: STEROIDS, STRESS ULCERS & H. PYLORI]

SZABÓ Sándor

[Although Hans Selye is mostly known for his discovery & development of the stress concept, he also introduced the first physiologically sound, structure-activity classification of steroids that was also based on the chemical structure of steroids in 1943. He not only introduced the names of glucocorticoids & mineralocorticoids but discovered the anti- & pro-inflammatory properties, respectively, of these steroids in animal models. Furthermore, he not only described the first stress-induced gastric ulcers in rats (1936) & characterized the first human ‘stress ulcers’ during the air-raids in London during World War II (1943). Thus, Selye was a much more productive & creative scientist than it is generally considered.]

Clinical Neuroscience

MARCH 30, 2014

[THE SURPRISING DUAL ACTION OF GLUCOCORTICOIDS]

LUDMILA Filaretova, MAKARA Gábor

[Glucocorticoid hormones may have dual action on the stomach: physiological gastroprotective and pathological proulcerogenic one. In physiological conditions, even in acute stress situations, glucocorticoids have an adaptive effect on the stomach and, therefore, are gastroprotective. The findings that we review in this article suggest that glucocorticoids released during acute stress are naturally occurring protective factors that play an important role in maintenance of the gastric mucosal integrity.]

LAM KID

MARCH 30, 2014

[The EFEZUS study: Estimation oF the Effectiveness of Zoledronic acid in Use in Steroid-induced osteoporosis in real life]

KISS Csaba György, SURMANN Ágnes, DRESCHER Edit

[The Hungarian EFEZUS study (Estimation oF the Effectiveness of Zoledronic acid in Use in Steroid-induced osteoporosis in real life) was a multicentre, prospective, non-interventional, open-label, one-year-long study, in which we assessed the effect of zoledronic acid on bone mineral density and on the markers of bone turnover in osteoporosis developing after treatment with glucocorticoids. The mean baseline lumbar BMD was 0.762 g/cm2 and by the end of 12 month it increased to 0.818 g/cm2 (p<0.0001). The mean BMD measured at the femoral neck during visit 1 was 0.675 g/cm2, and it increased to 0.711 g/cm2 by visit 2 (end of study) (p<0.0005). The levels of bone turnover markers (cTX, nTX) significantly decreased between visits 1 and 2 (p<0.05). The mean cTX level at visit 1 was 421.2 ng/l (SD: 309 ng/l), which decreased to 253.3 ng/l (SD: 188.1 ng/l) by visit 2. The mean change in the levels of nTX was 0.65 µg/l (SD: 0.36 µg/l) and 0.39 µg/l (SD: 0.28 µg/l), respectively. There was no major change in serum and urine calcium levels. Five adverse events were reported by 4 patients during the study. ]

Lege Artis Medicinae

MAY 21, 2006

[NEW DATA ABOUT INFLAMMATORY MYOPATHIES]

DANKÓ Katalin, PONYI Andrea, CONSTANTIN Tamás

[Idiopathic inflammatory myopathies are systemic autoimmune diseases with an immune-mediated inflammation of the striated muscles which lead to progressive muscle weakness. Their cause is still unknown, but recently the understanding of the molecular immunopathology has improved, which may as well offer therapeutic targets in the future. The aim of this review is to present currently available data on the most important factors and processes that are involved in the pathogenesis of these diseases. Although glucocorticoids remain the cornerstone of the treatment for the major forms of idiopathic inflammatory myopathies, there are other efficacious immunosuppressive agents with fewer side effects. The authors discuss classic treatment regimens as well as more recent therapeutic approaches.]

Lege Artis Medicinae

JANUARY 20, 2010

[The effect of chronic stress on defense mechanisms chronic inflammation and carcinogenesis]

MOLNÁR Ildikó

[During stress, the activation of the hypothalamus- pituitary-adrenal axis and the sympathetic, sensory nervous system leads to an increased production of glucocorticoids, catecholamines and other active peptides. The specific receptors on immunocompetent and tissue cells for glucocorticoid, corticotropin-releasing hormone and histamine, substance-P, norepinephrine, calcitonin gene-related peptide can modify the cytokine production of macrophages, lymphocytes and tissue cells. Local hormonal effects have a role in the degranulation of mast cells and thus in histamine release and neurogenic inflammation. Long-term, chronic inflammations promote carcinogenesis, in which the tumourassociated macrophages have an important role. Carcinogenesis is associated with disturbed cooperation between the neuronal immune and endocrine systems.]