scholarly journals Efficacy of synthetic glucocorticoids in COVID-19 endothelites

Author(s):  
Francesco Ferrara ◽  
Antonio Vitiello
2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Aya Sasaki ◽  
Margaret E. Eng ◽  
Abigail H. Lee ◽  
Alisa Kostaki ◽  
Stephen G. Matthews

AbstractSynthetic glucocorticoids (sGC) are administered to women at risk of preterm delivery, approximately 10% of all pregnancies. In animal models, offspring exposed to elevated glucocorticoids, either by administration of sGC or endogenous glucocorticoids as a result of maternal stress, show increased risk of developing behavioral, endocrine, and metabolic dysregulation. DNA methylation may play a critical role in long-lasting programming of gene regulation underlying these phenotypes. However, peripheral tissues such as blood are often the only accessible source of DNA for epigenetic analyses in humans. Here, we examined the hypothesis that prenatal sGC administration alters DNA methylation signatures in guinea pig offspring hippocampus and whole blood. We compared these signatures across the two tissue types to assess epigenetic biomarkers of common molecular pathways affected by sGC exposure. Guinea pigs were treated with sGC or saline in late gestation. Genome-wide modifications of DNA methylation were analyzed at single nucleotide resolution using reduced representation bisulfite sequencing in juvenile female offspring. Results indicate that there are tissue-specific as well as common methylation signatures of prenatal sGC exposure. Over 90% of the common methylation signatures associated with sGC exposure showed the same directionality of change in methylation. Among differentially methylated genes, 134 were modified in both hippocampus and blood, of which 61 showed methylation changes at identical CpG sites. Gene pathway analyses indicated that prenatal sGC exposure alters the methylation status of gene clusters involved in brain development. These data indicate concordance across tissues of epigenetic programming in response to alterations in glucocorticoid signaling.


2014 ◽  
Vol 229 ◽  
pp. S181-S182
Author(s):  
Danilo Pitardi ◽  
Daniela Meloni ◽  
Fabio Olivo ◽  
Maria Cavarretta ◽  
Daniela Loprevite ◽  
...  

2018 ◽  
Vol 61 (1) ◽  
pp. R61-R73 ◽  
Author(s):  
Emma J Agnew ◽  
Jessica R Ivy ◽  
Sarah J Stock ◽  
Karen E Chapman

Glucocorticoids are essential in mammals to mature fetal organs and tissues in order to survive after birth. Hence, antenatal glucocorticoid treatment (termed antenatal corticosteroid therapy) can be life-saving in preterm babies and is commonly used in women at risk of preterm birth. While the effects of glucocorticoids on lung maturation have been well described, the effects on the fetal heart remain less clear. Experiments in mice have shown that endogenous glucocorticoid action is required to mature the fetal heart. However, whether the potent synthetic glucocorticoids used in antenatal corticosteroid therapy have similar maturational effects on the fetal heart is less clear. Moreover, antenatal corticosteroid therapy may increase the risk of cardiovascular disease in adulthood. Here, we present a narrative review of the evidence relating to the effects of antenatal glucocorticoid action on the fetal heart and discuss the implications for antenatal corticosteroid therapy.


Author(s):  
David J. Handelsman

The Nobel prize-winning identification of testosterone as the mammalian male sex hormone in 1935 was the culmination of an ancient pursuit to learn how the testis was responsible for masculine virility and superior muscular strength. Within two years, testosterone was being used clinically, and within a decade much of the clinical pharmacology and many applications were recognised (1, 2). Given its weighty historical legacy as the archetypal virilizing substance, testosterone was soon being evaluated to boost pharmacologically the muscular size and strength of healthy men beyond physiological development. In the years following the Second World War, the pharmaceutical industry undertook an extensive quest to identify an ‘anabolic steroid’, an androgen without virilizing properties. Although this proved futile, with the search abandoned, the now meaningless term ‘anabolic steroid’, perpetuating a distinction without a difference, has persisted long beyond its scientific obsolescence largely as a journalistic device for sensationalism and demonization (3). Systematic androgen abuse first appears an epidemic, with an epicentre among Eastern European elite athletes, in the mid 1950s (4). This timing coincided with the golden age of steroid pharmacology in the postwar pharmaceutical industry boom years, which produced the oral contraceptive and synthetic glucocorticoids, and with the early years of the Cold War. This fortuitous intersection of industrial means, unscrupulous operators, and political goals shaped the emergence of systematic androgen abuse as a convenient tool by which sociopolitically dysfunctional Eastern bloc countries could gain short-cut ascendancy through symbolic victories over Western political rivals, a challenge quickly reciprocated by athletes and trainers from the advanced noncommunist countries. This bidding war escalated into national sports doping programs operated covertly by Eastern European communist governments. These organized programs of unscrupulous cheating mixed competitive fraudulence with callous ruination of their athletes’ welfare for national political goals. Of these, only the East German program, with its dire consequences for athletes’ health, has so far been fully disclosed (5). Over the next 4 decades, androgen abuse became endemic in countries where the population is sufficiently affluent to support this consumer variant of drug abuse. Once entrenched in the community, androgen abuse spreads beyond elite sports, where it remains as a low level endemic, to nonsporting users with recreational, cosmetic, and occupational motivations for body-building, such as seeking to promote a fearsome muscular image (6).


2014 ◽  
Vol 33 (4) ◽  
pp. 307-316 ◽  
Author(s):  
Milica Manojlović-Stojanoski ◽  
Nataša Ristić ◽  
Sandra Singh ◽  
Verica Milošević

Summary Fetal development is a critical period in the life cycle which is why the placenta provides a structural and physiological barrier that protects the fetus from the outer fluctuations and inner disturbances. A variety of influences from the environment, however, might induce fetal overexposure to glucocorticoids that target the fetal hypothalamic-pituitary-adrenal (HPA) axis and influence the fetal growth trajecto-r y. Development of the HPA axis starts in the early stages of pregnancy, but the timing of HPA axis maturation and the glucocorticoid receptor (GR) expression in relation to birth is highly species-specific. The functional state of the fetal HPA axis plays a key role in the maturation of many organs necessary for intrauterine development and existence after birth. A functional HPA axis in near-term fetuses provides an adequate response to stress and also affects the timing of parturition. Due to their potent effect on the maturation of fetal tissues, synthetic glucocorticoids are used in human pregnancy at risk of preterm delivery. Dexamethasone and betamethasone, as the ones most commonly used, cross the placental enzymatic barrier (11b-hydroxysteroid dehydrogenase type 2 – 11b-HSD2) and have 25-fold higher affinity to the GR than endogenous glucocorticoids, stimulating many aspects of fetal maturation. Despite the numerous positive effects, exposure to synthetic glucocorticoids during fetal development may result in intrauterine growth retardation and fetal programming of the HPA axis function which is associated with cardiovascular, metabolic and psychiatric disorders manifested later in life. Long-term consequences indicate the need for the implementation of new studies that will provide a better understanding of the link between glucocorti-coid overexposure during fetal development and adverse outcomes in adulthood.


Sign in / Sign up

Export Citation Format

Share Document