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Glucocorticoid deficiency

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https://www.readbyqxmd.com/read/28732066/inhibition-of-pulmonary-%C3%AE-carotene-15-15-oxygenase-expression-by-glucocorticoid-involves-ppar%C3%AE
#1
Xiaoming Gong, Raju Marisiddaiah, Lewis P Rubin
β-carotene 15,15'-oxygenase (BCO1) catalyzes the first step in the conversion of dietary provitamin A carotenoids to vitamin A. This enzyme is expressed in a variety of developing and adult tissues, suggesting that its activity may regulate local retinoid synthesis. Vitamin A and related compounds (retinoids) are critical regulators of lung epithelial development, integrity, and injury repair. A balance between the actions of retinoids and glucocorticoids (GCs) promotes normal lung development and, in particular, alveolarization...
2017: PloS One
https://www.readbyqxmd.com/read/28726773/t-cell-autonomous-death-induced-by-regeneration-of-inert-glucocorticoid-metabolites
#2
Lourdes Rocamora-Reverte, Holger M Reichardt, Andreas Villunger, GJan Wiegers
Glucocorticoids (GC) are essential regulators of T-cell development and function. Activation of the immune system increases systemic adrenal-derived GC levels which downregulate immune activity as part of a negative feedback control system. Increasing evidence shows, however, that GC can also be derived from extra-adrenal sources such as the thymus or intestine, thus providing local control of GC-mediated effects. The thymus reportedly produces GC, but whether thymic epithelial cells or thymocytes produce GC acting either in an autocrine or paracrine fashion is not clear...
July 20, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28679951/a-salt-sensing-kinase-in-t-lymphocytes-sgk1-drives-hypertension-and-hypertensive-end-organ-damage
#3
Allison E Norlander, Mohamed A Saleh, Arvind K Pandey, Hana A Itani, Jing Wu, Liang Xiao, Jooeun Kang, Bethany L Dale, Slavina B Goleva, Fanny Laroumanie, Liping Du, David G Harrison, Meena S Madhur
We previously showed that angiotensin II (Ang II) increases T cell production of IL-17A, and that mice deficient in IL-17A have blunted hypertension and attenuated renal and vascular dysfunction. It was recently shown that salt enhances IL-17A production from CD4+ T cells via a serum- and glucocorticoid-regulated kinase 1-dependent (SGK1-dependent) pathway. Thus, we tested the hypothesis that SGK1 signaling in T cells promotes hypertension and contributes to end-organ damage. We show that loss of T cell SGK1 results in a blunted hypertensive response to Ang II infusion by 25 mmHg...
July 6, 2017: JCI Insight
https://www.readbyqxmd.com/read/28676523/macrophage-11%C3%AE-hsd1-deficiency-promotes-inflammatory-angiogenesis
#4
Zhenguang Zhang, Agnes E Coutinho, Janet Tak Yun Man, Tiina M J Kipari, Patrick Hadoke, Donald M Salter, Jonathan R Seckl, Karen Chapman
11β-hydroxysteroid dehydrogenase-1 (11β-HSD1) predominantly converts inert glucocorticoids into active forms, thereby contributing to intracellular glucocorticoid levels. 11β-HSD1 is dynamically regulated during inflammation, including in macrophages where it regulates phagocytic capacity. The resolution of inflammation in some disease models including inflammatory arthritis, is impaired by 11β-HSD1 deficiency or inhibition. However, 11β-HSD1 deficiency/inhibition also promotes angiogenesis, which is beneficial in mouse models of surgical wound healing, myocardial infarction or obesity...
July 4, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28666938/death-of-adrenocortical-cells-during-murine-acute-t-cruzi-infection-is-not-associated-with-tnf-r1-signaling-but-mostly-with-the-type-ii-pathway-of-fas-mediated-apoptosis
#5
Ana R Pérez, Flavia Lambertucci, Florencia B González, Eduardo A Roggero, Oscar A Bottasso, Juliana de Meis, Maria T Ronco, Silvina R Villar
Earlier studies from our laboratory demonstrated that acute experimental Trypanosoma cruzi infection promotes an intense inflammation along with a sepsis-like dysregulated adrenal response characterized by normal levels of ACTH with raised glucocorticoid secretion. Inflammation was also known to result in adrenal cell apoptosis, which in turn may influence HPA axis uncoupling. To explore factors and pathways which may be involved in the apoptosis of adrenal cells, together with its impact on the functionality of the gland, we carried out a series of studies in mice lacking death receptors, such as TNF-R1 (C57BL/6-(Tnfrsf1a tm1Imx) or TNF-R1(-/-)) or Fas ligand (C57BL/6 Fas-deficient lpr mice), undergoing acute T...
June 27, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28659593/a-quantitative-study-of-internal-and-external-interactions-of-homodimeric-glucocorticoid-receptor-using-fluorescence-cross-correlation-spectroscopy-in-a-live-cell
#6
Manisha Tiwari, Sho Oasa, Johtaro Yamamoto, Shintaro Mikuni, Masataka Kinjo
Glucocorticoid receptor (GRα) is a well-known ligand-dependent transcription-regulatory protein. The classic view is that unliganded GRα resides in the cytoplasm, relocates to the nucleus after ligand binding, and then associates with a specific DNA sequence, namely a glucocorticoid response element (GRE), to activate a specific gene as a homodimer. It is still a puzzle, however, whether GRα forms the homodimer in the cytoplasm or in the nucleus before DNA binding or after that. To quantify the homodimerization of GRα, we constructed the spectrally different fluorescent protein tagged hGRα and applied fluorescence cross-correlation spectroscopy...
June 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28650457/fibroblast-growth-factor-19-regulates-skeletal-muscle-mass-and-ameliorates-muscle-wasting-in-mice
#7
Bérengère Benoit, Emmanuelle Meugnier, Martina Castelli, Stéphanie Chanon, Aurélie Vieille-Marchiset, Christine Durand, Nadia Bendridi, Sandra Pesenti, Pierre-Axel Monternier, Anne-Cécile Durieux, Damien Freyssenet, Jennifer Rieusset, Etienne Lefai, Hubert Vidal, Jérôme Ruzzin
The endocrine-derived hormone fibroblast growth factor (FGF) 19 has recently emerged as a potential target for treating metabolic disease. Given that skeletal muscle is a key metabolic organ, we explored the role of FGF19 in that tissue. Here we report a novel function of FGF19 in regulating skeletal muscle mass through enlargement of muscle fiber size, and in protecting muscle from atrophy. Treatment with FGF19 causes skeletal muscle hypertrophy in mice, while physiological and pharmacological doses of FGF19 substantially increase the size of human myotubes in vitro...
June 26, 2017: Nature Medicine
https://www.readbyqxmd.com/read/28638668/severe-short-stature-in-an-adolescent-male-with-prader-willi-syndrome-and-congenital-adrenal-hyperplasia-a-therapeutic-conundrum
#8
Meredith Wasserman, Erin M Mulvihill, Angela Ganan-Soto, Serife Uysal, Jose Bernardo Quintos
Congenital adrenal hyperplasia (CAH) due to 21-hydroxylase deficiency results in excess androgen production which can lead to early epiphyseal fusion and short stature. Prader-Willi syndrome (PWS) is a genetic disorder resulting from a defect on chromosome 15 due to paternal deletion, maternal uniparental disomy, or imprinting defect. Ninety percent of patients with PWS have short stature. In this article we report a patient with simple-virilizing CAH and PWS who was overtreated with glucocorticoids for CAH and not supplemented with growth hormone for PWS, resulting in a significantly short adult height...
2017: Case Reports in Endocrinology
https://www.readbyqxmd.com/read/28582566/non-classic-congenital-adrenal-hyperplasia-due-to-21-hydroxylase-deficiency-revisited-an-update-with-a-special-focus-on-adolescent-and-adult-women
#9
Enrico Carmina, Didier Dewailly, Héctor F Escobar-Morreale, Fahrettin Kelestimur, Carlos Moran, Sharon Oberfield, Selma F Witchel, Ricardo Azziz
BACKGROUND: Non-classic congenital hyperplasia (NCAH) due to 21-hydroxylase deficiency is a common autosomal recessive disorder characterized by androgen excess. OBJECTIVE AND RATIONALE: We conducted a systematic review and critical assessment of the available evidence pertaining to the epidemiology, pathophysiology, diagnosis and management of NCAH. A meta-analysis of epidemiological data was also performed. SEARCH METHODS: Peer-reviewed studies evaluating NCAH published up to October 2016 were reviewed...
June 5, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/28580390/glucocorticoid-receptor-mediated-cis-repression-of-osteogenic-genes-requires-brm-swi-snf
#10
Michael J Pico, Sharareh Hashemi, Fuhua Xu, Kevin Hong Nguyen, Robert Donnelly, Elizabeth Moran, Stephen Flowers
Glucocorticoids are an effective therapy for a variety of severe inflammatory and autoimmune disorders; however, the therapeutic use of glucocorticoids is severely limited by their negative side effects, particularly on osteogenesis. Glucocorticoids regulate transcription by binding to the glucocorticoid receptor (GR), which then binds the promoters of target genes to induce either activation or repression. The gene activation effects of nuclear hormone receptors broadly require the cooperation of the chromatin remodeling complex known as SWI/SNF, which is powered by an ATPase core...
December 2016: Bone Reports
https://www.readbyqxmd.com/read/28577243/review-on-the-biological-mechanisms-associated-with-depo-provera-and-hiv-1-risk-acquisition-in-women
#11
REVIEW
Funanani Takalani, Ndumiso N Mhlongo, Suri Moonsamy, Mahmoud E S Soliman
Women constitute more than 50% out of millions of individuals infected with HIV-1, the major causative agent of acquired immune deficiency syndrome. About 40% of HIV-1 infections have been reported to initiate in the female reproductive tract. However, the mechanisms through which these infections are spread are poorly understood; hence, there is now a major concern in women who use long acting injectable hormonal contraceptives, particularly Depo-Provera and an increase of HIV-1 risk acquisition. Based on literature, Depo-Provera has an affinity for both the glucocorticoid receptor and the progesterone receptor in the female reproductive tract...
June 3, 2017: Cell Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28576284/congenital-adrenal-hyperplasia
#12
REVIEW
Diala El-Maouche, Wiebke Arlt, Deborah P Merke
Congenital adrenal hyperplasia is a group of autosomal recessive disorders encompassing enzyme deficiencies in the adrenal steroidogenesis pathway that lead to impaired cortisol biosynthesis. Depending on the type and severity of steroid block, patients can have various alterations in glucocorticoid, mineralocorticoid, and sex steroid production that require hormone replacement therapy. Presentations vary from neonatal salt wasting and atypical genitalia, to adult presentation of hirsutism and irregular menses...
May 30, 2017: Lancet
https://www.readbyqxmd.com/read/28553748/mini-review-toxic-tendinopathy
#13
Brad Bolon
Toxic tendinopathy is a rare but reproducible complication in humans, given agents of four drug classes: aromatase inhibitors, fluoroquinolone antibiotics, glucocorticoids (long-term regimens), and statins. Toxic tendinopathy in humans has been linked less consistently to treatment with anabolic steroids, antiretroviral agents (mainly protease inhibitors), metalloproteinase inhibitors (MMPI), and isotretinoin. Classic drug-induced tendinopathies appear as "tendinosis" (i.e., progressive tendon degeneration without inflammation), although cases associated with aromatase inhibitors exhibit mainly tenosynovitis...
January 1, 2017: Toxicologic Pathology
https://www.readbyqxmd.com/read/28552588/vitamin-d-supplementation-during-pregnancy-effect-on-the-neonatal-immune-system-in-a-randomized-controlled-trial
#14
Eve Hornsby, Paul E Pfeffer, Nancy Laranjo, William Cruikshank, Marina Tuzova, Augusto A Litonjua, Scott T Weiss, Vincent J Carey, George O'Connor, Catherine Hawrylowicz
BACKGROUND: Programming of the immune system during fetal development can influence asthma-related risk factors and outcomes in later life. Vitamin D is a well-recognized immune modulator, and deficiency of this nutrient during pregnancy is hypothesized to influence disease development in offspring. OBJECTIVE: We sought to investigate the effect on neonatal immunity of maternal supplementation with 4400 IU/d vitamin D3 during the second and third trimesters of pregnancy by using a subset of cord blood samples from a randomized, double-blind, placebo-controlled clinical trial (the Vitamin D Antenatal Asthma Reduction Trial)...
May 16, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28549589/serum-retinol-levels-and-neonatal-outcomes-in-preterm-infants
#15
Hsing-Jin Chen, Chyong-Hsin Hsu, Bor-Luen Chiang
BACKGROUND: Glucocorticoids are frequently administered to preterm infants, both antenatally and postnatally; however, the effect on serum retinol levels has not been determined. The risk of bronchopulmonary dysplasia is increased in premature infants with low retinol concentrations. OBJECTIVES: Our purpose was to determine the effect of glucocorticoid administration on serum retinol levels in preterm infants. METHODS: All infants <1250 g or <29 weeks' gestation admitted to the neonatal intensive care unit within 48 h of birth were eligible for inclusion...
May 23, 2017: Journal of the Formosan Medical Association, Taiwan Yi Zhi
https://www.readbyqxmd.com/read/28548945/soluble-antigens-from-the-neurotropic-pathogen-angiostrongylus-cantonensis-directly-induce-thymus-atrophy-in-a-mouse-model
#16
Zhen Liu, Dong-Ming Su, Zi-Long Yu, Feng Wu, Rui-Feng Liu, Shi-Qi Luo, Zhi-Yue Lv, Xin Zeng, Xi Sun, Zhong-Dao Wu
The nematode Angiostrongylus cantonensis (A.C.) is a neurotropic pathogen; stage-III larva invade the human (non-permissive host) central nervous system (CNS) to cause eosinophilic meningitis or meningoencephalitis accompanied by immunosuppression. In an A.C.-infectedmouse (another non-permissive host) model, CNS damage-associated T cell immune deficiency and severe inflammation were proposed to result from activation of the hypothalamic-pituitary-adrenal (HPA) axis. However, glucocorticoids are anti-inflammatory agents...
May 12, 2017: Oncotarget
https://www.readbyqxmd.com/read/28546232/genetic-defects-in-pediatric-onset-adrenal-insufficiency-in-japan
#17
Naoko Amano, Satoshi Narumi, Mie Hayashi, Masaki Takagi, Kazuhide Imai, Toshiro Nakamura, Rumi Hachiya, Goro Sasaki, Keiko Homma, Tomohiro Ishii, Tomonobu Hasegawa
CONTEXT: Most patients with pediatric-onset primary adrenal insufficiency (PAI), such as 21-hydroxylase deficiency, can be diagnosed by measuring the urine or serum levels of steroid metabolites. However, the etiology is often difficult to determine in a subset of patients lacking characteristic biochemical findings. OBJECTIVE: To assess the frequency of genetic defects in Japanese children with biochemically uncharacterized PAI and characterize the phenotypes of mutation-carrying patients...
August 2017: European Journal of Endocrinology
https://www.readbyqxmd.com/read/28540625/pituitary-dysfunction-in-granulomatosis-with-polyangiitis
#18
REVIEW
Daniela Esposito, Penelope Trimpou, Dario Giugliano, Mats Dehlin, Oskar Ragnarsson
PURPOSE: Granulomatosis with polyangiitis (GPA) is a multisystem disease, characterized by necrotizing small-vessel vasculitis, which mainly affects the respiratory tract and the kidneys. Pituitary involvement in GPA is rare, present in about 1% of all cases of GPA. To date, only case reports or small case series have been published. Herein we report clinical features, imaging findings, treatment and outcomes in three patients with GPA-related pituitary dysfunction (PD). METHODS: A retrospective analysis of three cases of GPA-related PD was conducted, followed by systematic review of the English medical literature using PubMed...
May 24, 2017: Pituitary
https://www.readbyqxmd.com/read/28539411/substrate-binding-by-the-yeast-hsp110-nucleotide-exchange-factor-and-molecular-chaperone-sse1-is-not-obligate-for-its-biological-activities
#19
Veronica M Garcia, Nadinath B Nillegoda, Bernd Bukau, Kevin A Morano
The highly conserved heat shock protein 70 (Hsp70) is a ubiquitous molecular chaperone essential for maintaining cellular protein homeostasis. The related protein Hsp110 (Sse1/Sse2 in Saccharomyces cerevisiae) functions as a nucleotide exchange factor (NEF) to regulate the protein folding activity of Hsp70. Hsp110/Sse1 also can prevent protein aggregation in vitro via its substrate-binding domain (SBD), but the cellular roles of this "holdase" activity are poorly defined. We generated and characterized an Sse1 mutant that separates, for the first time, its nucleotide exchange and substrate-binding functions...
July 15, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28527581/nuclear-receptors-in-skeletal-homeostasis
#20
Hao Zuo, Yihong Wan
Nuclear receptors are a family of transcription factors that can be activated by lipophilic ligands. They are fundamental regulators of development, reproduction, and energy metabolism. In bone, nuclear receptors enable bone cells, including osteoblasts, osteoclasts, and osteocytes, to sense their dynamic microenvironment and maintain normal bone development and remodeling. Our views of the molecular mechanisms in this process have advanced greatly in the past decade. Drugs targeting nuclear receptors are widely used in the clinic for treating patients with bone disorders such as osteoporosis by modulating bone formation and resorption rates...
2017: Current Topics in Developmental Biology
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