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Journal of Steroid Biochemistry and Molecular Biology

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https://www.readbyqxmd.com/read/28734989/hydroxyvitamin-d-assays-an-historical-perspective-from-deqas
#1
G D Carter, J Berry, R Durazo-Arvizu, E Gunter, G Jones, J Jones, H L J Makin, P Pattni, C T Sempos, P Twomey, E L Williams, S A Wise
Recent years have seen a substantial increase in demand for 25-hydroxyvitamin D (25-OHD) assays. DEQAS (the Vitamin D External Quality Assessment Scheme) has been monitoring the performance of these assays since 1989. The first DEQAS distribution was in June 1989 and results were submitted by 13 laboratories in the UK, two of which used HPLC/UV; the rest used ligand binding assays with a tritium tracer. Inter-laboratory CVs (ALTM) ranged from 29.3% (42.7 nmol/L) to 53.7% (20.0 nmol/L). Currently the scheme has participants in 56 countries using 30 methods or variants of methods...
July 19, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28734988/can-adverse-effects-of-excessive-vitamin-d-supplementation-occur-without-developing-hypervitaminosis-d
#2
REVIEW
Mohammed S Razzaque
Vitamin D is a fat-soluble hormone that has endocrine, paracrine and autocrine functions. Consumption of vitamin D-supplemented food & drugs have increased significantly in the last couple of decades due to campaign and awareness programs. Despite such wide use of artificial vitamin D supplements, serum levels of 25 hydroxyvitamin D [25(OH)D] does not always reflect the amount of uptake. In contrast to the safe sunlight exposure, prolonged and disproportionate consumption of vitamin D supplements may lead to vitamin D intoxication, even without developing hypervitaminosis D...
July 19, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28734987/bioavailable-and-free-25-hydroxyvitamin-d-and-vitamin-d-binding-protein-in-polycystic-ovary-syndrome-relationships-with-obesity-and-insulin-resistance
#3
Negar Naderpoor, Soulmaz Shorakae, Sally K Abell, Aya Mousa, Anju E Joham, Lisa J Moran, Nigel K Stepto, Poli Mara Spritzer, Helena J Teede, Barbora de Courten
Polycystic ovary syndrome (PCOS) is a common condition characterised by both reproductive and metabolic features (obesity, insulin resistance, diabetes risk). Some evidence suggests that women with PCOS have lower vitamin D levels compared to healthy controls. Vitamin D binding protein (DBP) is the main carrier of vitamin D in circulation and plays an important role in regulating vitamin D concentration and bioavailability for target tissues. To our knowledge, no previous studies have examined DBP, bioavailable and free 25-hydroxyvitamin D (25(OH)D) in women with PCOS...
July 19, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28716761/recent-developments-for-introducing-a-hexafluoroisopropanol-unit-into-the-vitamin-d-side-chain
#4
REVIEW
Fumihiro Kawagoe, Toru Sugiyama, Motonari Uesugi, Atsushi Kittaka
Among numerous studies on synthetic approaches to and the biological activities of vitamin D analogues, we herein focused on falecalcitriol, an analogue of calcitriol (1α,25-dihydroxyvitamin D3), in which a 26,26,26,27,27,27-hexafluoroisopropanol unit has been introduced into the side chain. Falecalcitriol was designed to escape from the metabolism of CYP24A1 and has been used as a drug to treat secondary hypoparathyroidism since 2001. Its metabolite, the 23-hydroxy form, retains biological activity and resistants to further metabolism...
July 14, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28716760/properties-of-purified-cyp2r1-in-a-reconstituted-membrane-environment-and-its-25-hydroxylation-of-20-hydroxyvitamin-d3
#5
Chloe Y S Cheng, Tae-Kang Kim, Saowanee Jeayeng, Andrzej T Slominski, Robert C Tuckey
Recent studies indicate that CYP2R1 is the major 25-hydroxylase catalyzing the first step in vitamin D activation. Since the catalytic properties of CYP2R1 have been poorly studied to date and it is a membrane protein, we examined the purified enzyme in a membrane environment. CYP2R1 was expressed in E. coli and purified by nickel affinity- and hydrophobic interaction-chromatography and assayed in a reconstituted membrane system comprising phospholipid vesicles plus purified human NADPH-P450 oxidoreductase...
July 14, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28716759/vitamin-d-levels-in-childhood-and-adolescence-and-cardiovascular-risk-factors-in-a-cohort-of-healthy-australian-children
#6
Larry Ke, Rebecca S Mason, Louise A Baur, Chris T Cowell, Xiaoying Liu, Sarah P Garnett, Kaye E Brock
As the prevalence of obesity appears to be increasing in Australia's youth the overall objective of this study was to examine serum 25-hydroxyvitamin D (25OHD) concentrations in a cohort of 8-year-olds (n=249) followed up at age 15 (n=162) and explore associations between 25OHD with cardiovascular disease (CVD) risk factors in these populations. This was done in two stages: the first, two cross-sectional analyses (at ages 8 and 15); and the second, a prospective analysis from age 8 to 15. At both ages data on 25OHD, blood lipids, and anthropometry were measured...
July 14, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28711487/aucubin-promotes-angiogenesis-via-estrogen-receptor-beta-in-a-mouse-model-of-hindlimb-ischemia
#7
Lu Chen, Yue Yang, Lusha Zhang, Chunxiao Li, Joel Wake Coffie, Xiao Geng, Lizhen Qiu, Xingyu You, Zhirui Fang, Min Song, Xiumei Gao, Hong Wang
Aucubin (AU) is an iridoid glycoside that has been shown to display estrogenic properties and has various pharmacological effects. Herein, we described the angiogenic properties of AU. In the study, hindlimb ischemia was induced by ligation of femoral artery on the right leg of ovariectomized mice. AU treatment significantly accelerated perfusion recovery and reduced tissue injury in mice muscle. Quantification of CD31-positive vessels in hindlimb muscles provided evidences that AU promoted angiogenesis in peripheral ischemia...
July 12, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28710021/identification-of-tumor-autonomous-and-indirect-effects-of-vitamin-d-action-that-inhibit-breast-cancer-growth-and-tumor-progression
#8
REVIEW
Abhishek Aggarwal, David Feldman, Brian J Feldman
Several epidemiological studies have found that low vitamin D levels are associated with worse prognosis and poorer outcomes in patients with breast cancer (BCa), although some studies have failed to find this association. In addition, prior research has found that BCa patients with vitamin D deficiency have a more aggressive molecular phenotype and worse prognostic biomarkers. As vitamin D deficiency is common in patients diagnosed with BCa, elucidating the cause of the association between poor outcomes and vitamin D deficiency promises to have a significant impact on improving care for patients with BCa including enabling the development of novel therapeutic approaches...
July 11, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28694196/effect-of-sulfonated-steroids-on-steroidogenic-cytochrome-p450-dependent-steroid-hydroxylases
#9
J Neunzig, R Bernhardt
In the last decades, sulfonated steroids evolved from inactive metabolites intended for excretion to highly relevant compounds involved in many physiological processes. Investigations of the impact of sulfonated steroids on the steroid hormone biosynthesis revealed that, on the one hand, these can serve as substrate for steroidogenic cytochromes P450 and, on the other hand, these are able to influence the catalytic properties of these enzymes. In this review the relevance of sulfonated steroids for the steroid hormone biosynthesis will be discussed...
July 7, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28684382/a-regulatory-role-of-androgen-in-ovarian-steroidogenesis-by-rat-granulosa-cells
#10
Toru Hasegawa, Yasuhiko Kamada, Takeshi Hosoya, Shiho Fujita, Yuki Nishiyama, Nahoko Iwata, Yuji Hiramatsu, Fumio Otsuka
Excess androgen and insulin-like growth factor (IGF)-I in the ovarian follicle has been suggested to be involved in the pathophysiology of polycystic ovary syndrome (PCOS). Here we investigated the impact of androgen and IGF-I on the regulatory mechanism of ovarian steroidogenesis using rat primary granulosa cells. It was revealed that androgen treatment with dihydrotestosterone (DHT) amplified progesterone synthesis in the presence of FSH and IGF-I, whereas it had no significant effect on estrogen synthesis by rat granulosa cells...
July 3, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28684381/treatment-for-the-endocrine-resistant-breast-cancer-current-options-and-future-perspectives
#11
REVIEW
Chun-Yu Liu, Chia-Yun Wu, Karineh Petrossian, Tzu-Ting Huang, Ling-Ming Tseng, Shiuan Chen
Endocrine resistance remains a challenge and an unmet need for managing hormone receptor-positive breast cancer. The mechanisms of endocrine resistance are multifaceted and are likely to evolve over time following various single or combination therapies. The purpose of this review article is to provide general understanding of molecular basis of endocrine resistance of breast cancer and to offer comprehensive review on current treatment options and potential new treatment strategies for endocrine resistant breast cancers...
July 3, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28676458/vitamin-d-deficiency-and-sex-specific-dysregulation-of-placental-inflammation
#12
Nancy Q Liu, Dean P Larner, Qingqiang Yao, Rene F Chun, Yuxin Ouyang, Rui Zhou, Jennifer A Tamblyn, Carol L Wagner, Martin Hewison
To investigate an immunomodulatory role for vitamin D in pregnancy we used mice raised on vitamin D-sufficient (SUFF), or -deficient (DEF) diets. At embryonic day 14, pregnant mice received intraperitoneal injection of lipopolysaccharide (LPS) or vehicle for 24hrs, with age-matched non-pregnant mice as controls. In non-pregnant mice, 6 serum analytes (IL-1β, IL-18, MDC/CCL22, MIP-1α/CCL3, EGF, IgA) were lower in DEF mice. In pregnant DEF mice only GH was higher. In non-pregnant mice LPS induced 28 analytes, with 5 (IL-18, IP-10/CXCL10, MCP-1/CCL2, MIP-1β/CCL4, MIP-3β/CCL19) being highest in DEF mice...
July 1, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28676457/on-the-role-of-classical-and-novel-forms-of-vitamin-d-in-melanoma-progression-and-management
#13
REVIEW
Andrzej T Slominski, Anna A Brozyna, Cezary Skobowiat, Michal A Zmijewski, Tae-Kang Kim, Zorica Janjetovic, Allen S Oak, Wojciech Jozwicki, Anton M Jetten, Rebecca S Mason, Craig Elmets, We Li, Robert M Hoffman, Robert C Tuckey
Melanoma represents a significant clinical problem affecting a large segment of the population with a relatively high incidence and mortality rate. Ultraviolet radiation (UVR) is an important etiological factor in malignant transformation of melanocytes and melanoma development. UVB, while being a full carcinogen in melanomagenesis, is also necessary for the cutaneous production of vitamin D3 (D3). Calcitriol (1,25(OH)2D3) and novel CYP11A1-derived hydroxyderivatives of D3 show anti-melanoma activities and protective properties against damage induced by UVB...
July 1, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28645527/inhibition-of-17beta-hydroxysteroid-dehydrogenase-type-7-modulates-breast-cancer-protein-profile-and-enhances-apoptosis-by-down-regulating-grp78
#14
Xiao-Qiang Wang, Juliette A Aka, Tang Li, Dan Xu, Charles J Doillon, Sheng-Xiang Lin
17beta-hydroxysteroid dehydrogenase type 7 (17β-HSD7) promotes breast cancer cell growth via dual-catalytic activity by modulating estradiol and DHT. Here, we clarified the expression pattern of 17β-HSD7 in postmenopausal luminal A type breast cancer with The Cancer Genome Atlas (TCGA) cohort. The impact of 17β-HSD7 inhibition on the proteome of MCF-7 cells was investigated and on cell apoptosis was revealed. MCF-7 cells were treated with an efficient inhibitor of 17β-HSD7 or with vehicle, and a differential proteomics study was performed using two-dimensional (2D) gel electrophoresis followed by mass spectrometry and ingenuity pathway analysis (IPA)...
June 20, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28642093/functional-characterization-of-3-ketosteroid-9%C3%AE-hydroxylases-in-rhodococcus-ruber-strain-chol-4
#15
Govinda Guevara, Laura Fernández de as Heras, Julián Perera, Juana María Navarro Llorens
The 3-Ketosteroid-9α-Hydroxylase, also known as KshAB [androsta-1,4-diene-3,17-dione, NADH:oxygen oxidoreductase (9α-hydroxylating); EC 1.14.13.142)], is a key enzyme in the general scheme of the bacterial steroid catabolism in combination with a 3-ketosteroid-Δ(1)-dehydrogenase activity (KstD), being both responsible of the steroid nucleus (rings A/B) breakage. KshAB initiates the opening of the steroid ring by the 9α-hydroxylation of the C9 carbon of 4-ene-3-oxosteroids (e.g. AD) or 1,4-diene-3-oxosteroids (e...
June 19, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28636886/sirt1-enzymatically-potentiates-1-25-dihydroxyvitamin-d3-signaling-via-vitamin-d-receptor-deacetylation
#16
Marya S Sabir, Zainab Khan, Chengcheng Hu, Michael A Galligan, Christopher M Dussik, Sanchita Mallick, Angelika Dampf Stone, Shane F Batie, Elizabeth T Jacobs, G Kerr Whitfield, Mark R Haussler, Michael C Heck, Peter W Jurutka
The hormonal metabolite of vitamin D, 1,25-dihydroxyvitamin D3 (1,25D), binds to the vitamin D receptor (VDR) and promotes heterodimerization of VDR with a retinoid-X-receptor (RXR) to genomically regulate diverse cellular processes. Herein, it is revealed for the first time that VDR is post-translationally acetylated, and that VDR immunoprecipitated from human embryonic kidney (HEK293) cells displays a dramatic decrease in acetylated receptor in the presence of 1,25D-ligand, sirtuin-1 (SIRT1) deacetylase, or the resveratrol activator of SIRT1...
June 19, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28629994/the-effect-of-estrogen-on-tendon-and-ligament-metabolism-and-function
#17
REVIEW
D R Leblanc, M Schneider, P Angele, G Volmer, D Docheva
Tendons and ligaments are crucial structures inside the musculoskeletal system. Still many issues in the treatment of tendon diseases and injuries have yet not been resolved sufficiently. In particular, the role of estrogen-like compound (ECL) in tendon biology has received until now little attention in modern research, despite ECL being a well-studied and important factor in the physiology of other parts of the musculoskeletal system. In this review we attempt to summarize the available information on this topic and to determine many open questions in this field...
June 16, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28627485/limitations-of-vitamin-d-supplementation-trials-why-observational-studies-will-continue-to-help-determine-the-role-of-vitamin-d-in-health
#18
REVIEW
Robert Scragg
Observational studies have shown that low vitamin D status is associated with an increased risk of a wide range of diseases. The body of observational evidence now is so large, that there have been many calls for randomized controlled trials (RCT) of vitamin D supplementation to confirm once and for all whether increasing body vitamin D levels prevents these diseases. These calls have arisen because of concern that confounding and reverse causation may explain many of the results from observational studies...
June 13, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28619249/metabolism-of-sex-steroids-is-influenced-by-acquired-adiposity-a-study-of-young-adult-male-monozygotic-twin-pairs
#19
Veera Vihma, Jussi Naukkarinen, Ursula Turpeinen, Esa Hämäläinen, Jaakko Kaprio, Aila Rissanen, Sini Heinonen, Antti Hakkarainen, Jesper Lundbom, Nina Lundbom, Tomi S Mikkola, Matti J Tikkanen, Kirsi H Pietiläinen
Obesity and ageing are associated with lower serum testosterone levels in men. How fat distribution or adipose tissue metabolism, independent of genetic factors and age, are related to sex steroid metabolism is less clear. We studied the associations between adiposity and serum sex hormone concentrations, and mRNA expression of genes regulating sex hormone metabolism in adipose tissue in young adult male monozygotic (MZ) twin pairs. The subjects [n=18 pairs; mean age, 32 years; individual body mass indexes (BMIs) 22-36kg/m(2)] included 9 male MZ twin pairs discordant for BMI [intra-pair difference (Δ) in BMI ≥3kg/m(2)]...
June 12, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28610873/williams-syndrome-transcription-factor-wstf-acts-as-an-activator-of-estrogen-receptor-signaling-in-breast-cancer-cells-and-the-effect-can-be-abrogated-by-1%C3%AE-25-dihydroxyvitamin-d3
#20
Johan Lundqvist, Tove Kirkegaard, Anne-Vibeke Laenkholm, Anne Katrine Duun-Henriksen, Martin Bak, David Feldman, Anne E Lykkesfeldt
A majority of estrogen receptor positive (ER+) breast cancers are growth stimulated by estrogens. The ability to inhibit the ER signaling pathway is therefore of critical importance in the current treatment of ER+ breast cancers. It has been reported that 1α,25-dihydroxyvitamin D3 down-regulates the expression of the CYP19A1 gene, encoding the aromatase enzyme that catalyzes the synthesis of estradiol. Furthermore, 1α,25-dihydroxyvitamin D3 has also been reported to down-regulate the expression of estrogen receptor α (ERα), the main mediator of ER signaling...
June 10, 2017: Journal of Steroid Biochemistry and Molecular Biology
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