Journal of Steroid Biochemistry and Molecular Biology最新文献

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Evaluation of inhibition and eradication of bacterial biofilm by solasodin.
IF 2.7 2区 生物学
Journal of Steroid Biochemistry and Molecular Biology Pub Date : 2024-12-05 DOI: 10.1016/j.jsbmb.2024.106654
Ana Raquel Pereira da Silva, Maria do Socorro Costa, Nara Juliana Santos Araújo, Thiago Sampaio de Freitas, Cícera Laura Roque Paulo, Maria Anésia Sousa de Alencar, José Maria Barbosa-Filho, Jacqueline Cosmo Andrade-Pinheiro, Henrique Douglas Melo Coutinho
{"title":"Evaluation of inhibition and eradication of bacterial biofilm by solasodin.","authors":"Ana Raquel Pereira da Silva, Maria do Socorro Costa, Nara Juliana Santos Araújo, Thiago Sampaio de Freitas, Cícera Laura Roque Paulo, Maria Anésia Sousa de Alencar, José Maria Barbosa-Filho, Jacqueline Cosmo Andrade-Pinheiro, Henrique Douglas Melo Coutinho","doi":"10.1016/j.jsbmb.2024.106654","DOIUrl":"10.1016/j.jsbmb.2024.106654","url":null,"abstract":"<p><p>Biofilms are complex microbial structures that have a significant impact on human health, industry and the environment. These complex structures represent one of the main mechanisms of microbial resistance, and their development constitutes a serious health problem. Therefore, the aim of this study was to verify the potential for inhibition and eradication of bacterial biofilm by salosodine, which is a steroidal alkaloid sapogenin found in plants of the Solanum genus. The antibiotics gentamicin, norfloxacin, ampicillin and the antiseptic agent chlorhexidine gluconate were used as positive controls to compare the results. Solasodin showed significant results in inhibiting the formation of Enterococcus faecalis and Staphylococcus aureus biofilms at the two concentrations tested. And when comparing the effect of solasodine for the two concentrations and the effect of the antibiotic gentamicin, it was found that sapogenin showed a better percentage in inhibiting E. faecalis biofilm formation. And against Pseudomonas aeruginosa, solasodine only inhibited biofilm formation at the highest concentration compared to the control. In the biofilm eradication results, solasodine showed a significant reduction in the biomass of the S. aureus biofilm, and when compared with the percentage reduction of the antibiotics, solasodine showed a relevant result for both concentrations. Only at the lowest concentration did solasodine show a reduction in P. aeruginosa biofilm biomass, a reduction close to that of chlorhexidine gluconate. In terms of activity, solasodine has been shown to have the potential to inhibit biofilm formation. However, further tests are needed to investigate the mechanisms of action of this sapogenin on the bacterial biofilms tested.</p>","PeriodicalId":51106,"journal":{"name":"Journal of Steroid Biochemistry and Molecular Biology","volume":" ","pages":"106654"},"PeriodicalIF":2.7,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142792734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Specific and potent inhibition of steroid hormone pre-receptor regulator AKR1C2 by perfluorooctanoic acid: Implications for androgen metabolism 全氟辛酸对类固醇激素前受体调节器 AKR1C2 的特异性强效抑制:对雄激素代谢的影响。
IF 2.7 2区 生物学
Journal of Steroid Biochemistry and Molecular Biology Pub Date : 2024-11-20 DOI: 10.1016/j.jsbmb.2024.106641
Andrea Andress Huacachino , Anna Chung , Kim Sharp , Trevor M. Penning
{"title":"Specific and potent inhibition of steroid hormone pre-receptor regulator AKR1C2 by perfluorooctanoic acid: Implications for androgen metabolism","authors":"Andrea Andress Huacachino ,&nbsp;Anna Chung ,&nbsp;Kim Sharp ,&nbsp;Trevor M. Penning","doi":"10.1016/j.jsbmb.2024.106641","DOIUrl":"10.1016/j.jsbmb.2024.106641","url":null,"abstract":"<div><div>Per- and polyfluoroalkyl substances (PFAS) are ubiquitous environmental pollutants that are highly stable synthetic organofluorine compounds. One congener perfluorooctanoic acid (PFOA) can be detected in nearly all humans and is recognized as an endocrine disrupting chemical (EDC). EDCs disrupt hormone synthesis and metabolism and receptor function. One mechanism of steroid hormone action is the pre-receptor regulation of ligand access to steroid hormone receptors by aldo-keto reductases. Here we report PFOA inhibition of AKR family 1 member C2 (AKR1C2), leading to dysregulation of androgen action. Spectrofluorimetric inhibitor screens identified PFOA as a competitive and tight binding inhibitor of AKR1C2, whose role is to inactivate 5α-dihydrotestosterone (5α-DHT). Further site directed mutagenesis studies along with molecular docking simulations revealed the importance of residue Valine 54 in mediating AKR1C2 inhibitor specificity. Binding site restrictions were explored by testing inhibition of other related PFAS chemicals, confirming that steric hinderance is a key factor. Furthermore, radiochromatography using HPLC and in line radiometric detection confirmed the accumulation of 5α-DHT as a result of PFOA inhibition of AKR1C2. We showed that PFOA could enhance the transactivation of AR in reporter genes assays in which 5α-DHT metabolism was blocked by AKR1C2 inhibition in HeLa cells. Taken together, these data suggest PFOA has a role in disrupting androgen action through inhibiting AKR1C2. Our work identifies an EDC function for PFOA not previously revealed.</div></div>","PeriodicalId":51106,"journal":{"name":"Journal of Steroid Biochemistry and Molecular Biology","volume":"246 ","pages":"Article 106641"},"PeriodicalIF":2.7,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142689428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of cholecalciferol supplementation on changes in total 25OHD, free 25OHD, and free 25OHD % in relation to calcium, bone, and glucose homeostasis in young, infertile men 补充胆钙化醇对年轻不育男性总25OHD、游离25OHD和游离25OHD%变化的影响与钙、骨骼和葡萄糖稳态的关系
IF 2.7 2区 生物学
Journal of Steroid Biochemistry and Molecular Biology Pub Date : 2024-11-20 DOI: 10.1016/j.jsbmb.2024.106640
Sam Kafai Yahyavi , Rune Holt , Mads Joon Jorsal , Lív Bech Árting , Ebbe Eldrup , Anders Juul , Niels Jørgensen , Martin Blomberg Jensen
{"title":"Influence of cholecalciferol supplementation on changes in total 25OHD, free 25OHD, and free 25OHD % in relation to calcium, bone, and glucose homeostasis in young, infertile men","authors":"Sam Kafai Yahyavi ,&nbsp;Rune Holt ,&nbsp;Mads Joon Jorsal ,&nbsp;Lív Bech Árting ,&nbsp;Ebbe Eldrup ,&nbsp;Anders Juul ,&nbsp;Niels Jørgensen ,&nbsp;Martin Blomberg Jensen","doi":"10.1016/j.jsbmb.2024.106640","DOIUrl":"10.1016/j.jsbmb.2024.106640","url":null,"abstract":"<div><h3>Background and objective</h3><div>While all types of vitamin D metabolites are bound to vitamin D binding protein and albumin leaving only a small fraction in its free active form, only serum concentrations of total 25-hydroxy vitamin D (25OHD) are used to determine vitamin D status in clinical practice. This study aimed to describe the association of total 25-hydroxy vitamin D (25OHD), calculated free 25OHD, and free 25OHD% (free 25OHD × 100 %/total 25OHD) with mineral, bone, and metabolic variables and assess the impact of cholecalciferol supplementation.</div></div><div><h3>Research design and methods</h3><div>Secondary data from a single-center, double-blinded, randomized, placebo-controlled clinical trial (NCT01304927) in 307 infertile men. The treatment group (n = 151) initially received 300,000 IU cholecalciferol as a bolus followed by 1400 IU daily for 150 days and was compared to a placebo group (n = 156).</div></div><div><h3>Results</h3><div>At baseline men with free 25OHD% &gt; 0.03 % had lower serum triglycerides (mmol/L) (0.8 vs. 1.0; p = 0.002), lower LDL (mmol/L) (2.7 vs. 3.1; p = 0.003), lower fasting blood glucose (mmol/L) (4.9 vs. 5.2; p = 0.012), and lower PTH (pmol/L) (3.8 vs. 4.6; p = 0.015) compared to men with free 25OHD% &lt; 0.02 %. When the study population was stratified according to total 25OHD or free 25OHD, the metabolic markers and bone variables did not show any differences. Cholecalciferol supplementation increased total 25OHD after 150 days compared to placebo and the difference was highest in men with lowest vitamin D status. Cholecalciferol supplementation did not change free 25OHD%.</div></div><div><h3>Conclusion</h3><div>The free 25OHD% is better associated with metabolic health markers such as serum triglycerides, LDL, and fasting blood glucose, but not bone or calciotrophic markers except parathyroid hormone. The free 25OHD% is not affected by cholecalciferol supplementation.</div></div>","PeriodicalId":51106,"journal":{"name":"Journal of Steroid Biochemistry and Molecular Biology","volume":"246 ","pages":"Article 106640"},"PeriodicalIF":2.7,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142693887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
GPER1 activation by estrogenic compounds in the inflammatory profile of breast cancer cells 雌激素化合物在乳腺癌细胞炎症特征中的 GPER1 激活。
IF 2.7 2区 生物学
Journal of Steroid Biochemistry and Molecular Biology Pub Date : 2024-11-19 DOI: 10.1016/j.jsbmb.2024.106639
Segovia-Mendoza Mariana , Reyes-Plata Brenda , Prado-Garcia Heriberto , Lemini Cristina , Barrera David , Ángeles-López Guadalupe
{"title":"GPER1 activation by estrogenic compounds in the inflammatory profile of breast cancer cells","authors":"Segovia-Mendoza Mariana ,&nbsp;Reyes-Plata Brenda ,&nbsp;Prado-Garcia Heriberto ,&nbsp;Lemini Cristina ,&nbsp;Barrera David ,&nbsp;Ángeles-López Guadalupe","doi":"10.1016/j.jsbmb.2024.106639","DOIUrl":"10.1016/j.jsbmb.2024.106639","url":null,"abstract":"<div><div>Breast cancer (BC) is the most frequent female neoplasm worldwide. Its establishment and development have been related to inflammatory cytokine expression. Steroid hormones such as estradiol (E<sub>2</sub>) can regulate proinflammatory cytokine secretion through interaction with its nuclear receptors. However, little is known regarding the activation of its membrane estrogen receptor (GPER1) and the inflammatory cytokine environment in BC. We have studied the synthesis and biological effects of molecules analogs to E<sub>2</sub> for hormone replacement therapy (HRT), such as pentolame. Nevertheless, its interaction with GPER1 and the modulation of inflammatory cytokines in different BC types has been barely studied and deserves deeper investigation. In this research, the role of GPER1 in the proliferation and modulation of inflammatory cytokines involved in carcinogenesis and metastatic processes in different BC cell lines was assessed by binding to various compounds. To achieve this goal, the presence of GPER1 was identified in different BC cell lines. Subsequently, cell proliferation after exposure to E<sub>2</sub>, pentolame and GPER1 agonist, G1, was subsequently determined alone or in combination with the GPER1 antagonist, G15. Finally, the pro-inflammatory cytokine secretion derived from the supernatants of BC cells exposed to the previous treatments was also assessed. Interestingly, GPER1 activation or inhibition has significant effects on the cytokine regulation associated with invasion in BC. Notably, pentolame did not induce cell proliferation or increase the proinflammatory cytokine expression compared to E<sub>2</sub> in BC cell lines. In addition, pentolame did not induce the presence of the cell adhesion molecule PECAM-1. In contrast, E2 treatment weakly induced the expression of PECAM-1 in MCF-7 and HCC1937 cells, and G1 treatment showed this effect only in MCF-7 cells. The results suggest that GPER1 might be a significant inflammatory modulator with angiogenic-related effects in BC cells. In addition, pentolame might represent an HRT alternative in patients with BC predisposition.</div></div>","PeriodicalId":51106,"journal":{"name":"Journal of Steroid Biochemistry and Molecular Biology","volume":"245 ","pages":"Article 106639"},"PeriodicalIF":2.7,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142689423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of parabens on human and rat placental 3β-hydroxysteroid dehydrogenase isoforms: Structure activity relationship and docking analysis 对羟基苯甲酸酯对人和大鼠胎盘 3β- 羟类固醇脱氢酶异构体的影响:结构活性关系和对接分析。
IF 2.7 2区 生物学
Journal of Steroid Biochemistry and Molecular Biology Pub Date : 2024-11-19 DOI: 10.1016/j.jsbmb.2024.106638
Jie Xiang , Mingzhu Zhong , Qian Zhang , Yang Zhu , Peipei Pan , Huitao Li , Qianjin Fei , Rongying Ou , Ren-shan Ge , Weibing Zhang
{"title":"Effects of parabens on human and rat placental 3β-hydroxysteroid dehydrogenase isoforms: Structure activity relationship and docking analysis","authors":"Jie Xiang ,&nbsp;Mingzhu Zhong ,&nbsp;Qian Zhang ,&nbsp;Yang Zhu ,&nbsp;Peipei Pan ,&nbsp;Huitao Li ,&nbsp;Qianjin Fei ,&nbsp;Rongying Ou ,&nbsp;Ren-shan Ge ,&nbsp;Weibing Zhang","doi":"10.1016/j.jsbmb.2024.106638","DOIUrl":"10.1016/j.jsbmb.2024.106638","url":null,"abstract":"<div><div>Parabens are widely used as preservatives in personal care products and are linked to potential disruptions in placental steroidogenesis. However, their exact impact remains unclear. This study aimed to explore the inhibition, mechanisms, structure-activity relationships (SAR) of parabens on human placental 3β-hydroxysteroid dehydrogenase type 1 (h3β-HSD1) and its rat counterpart, r3β-HSD4.3β-HSD activity was assayed in placental microsomes using pregnenolone as substrate and HPLC-MS/MS to measure progesterone and the effects of parabens on 3β-HSD was evaluated and SAR was performed. The research identified their inhibition against h3β-HSD1, with nonylparaben showing the highest potency (IC<sub>50</sub>, 4.17 µM), followed by phenylparaben, heptylparaben, hexylparaben, benzylparaben, butylparaben, propylparaben, and ethylparaben. The inhibition was characterized as mixed/noncompetitive. Additionally, these parabens inhibited progesterone secretion in human JAr cells at ≤100 µM. Similar trends were observed for r3β-HSD4. Docking simulations indicated that parabens interact with NAD<sup>+</sup> and steroid-binding sites of both enzymes. A negative correlation between LogP, molecular weight, volume, and alcohol chain carbon with IC<sub>50</sub> values highlighted the role of carbon chain length in determining inhibitory efficacy. The inhibitory potency of parabens on 3β-HSD is significantly influenced by their structural attributes, particularly the length of their carbon chains and LogP values.</div></div>","PeriodicalId":51106,"journal":{"name":"Journal of Steroid Biochemistry and Molecular Biology","volume":"245 ","pages":"Article 106638"},"PeriodicalIF":2.7,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142683458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The role of estrogen receptors in intracellular estrogen signaling pathways, an overview 雌激素受体在细胞内雌激素信号通路中的作用概述。
IF 2.7 2区 生物学
Journal of Steroid Biochemistry and Molecular Biology Pub Date : 2024-11-16 DOI: 10.1016/j.jsbmb.2024.106632
Zichang Gui , Wei Shi , Fangting Zhou , Yongqing Yan , Yuntian Li , Yang Xu
{"title":"The role of estrogen receptors in intracellular estrogen signaling pathways, an overview","authors":"Zichang Gui ,&nbsp;Wei Shi ,&nbsp;Fangting Zhou ,&nbsp;Yongqing Yan ,&nbsp;Yuntian Li ,&nbsp;Yang Xu","doi":"10.1016/j.jsbmb.2024.106632","DOIUrl":"10.1016/j.jsbmb.2024.106632","url":null,"abstract":"<div><div>To date five members of estrogen receptors (ESRs) have been reported. They are grouped into two classes, the nuclear estrogen receptors are members of the nuclear receptor family which found at nuclear, cytoplasm and plasma membrane, and the membrane estrogen receptors, such as G protein-coupled estrogen receptor 1, ESR-X and Gq-coupled membrane estrogen receptor. The structure and function of estrogen receptors, and interaction between ESR and coregulators were reviewed. In canonical pathway ESRs can translocate to the nucleus, bind to the target gene promotor with or without estrogen responsive element and regulate transcription, mediating the genomic effects of estrogen. Coactivators and corepressors are recruited to activate or inhibit transcription by activated ESRs. Many coactivators and corepressors are recruited to activate or inhibit ESR mediated gene transcription via different mechanisms. ESRs also indirectly bind to the promoter via interaction with other transcription factors, tethering the transcription factors. ESRs can be phosphorylated by several kinases such as p38, extracellular-signal-regulated kinase, and activated protein kinase B, and which activates transcription without ligand binding. Non-genomic estrogen action can be manifested by the increases of cytoplasmic NO and Ca<sup>2+</sup> through the activation of membrane ESRs. In female, ESRs signaling is crucial for folliculogenesis, oocyte growth, ovulation, oviduct and uterus. In male, ESRs signaling modulates libido, erectile function, leydig cell steroidogenesis, sertoli cell’s function, and epididymal fluid homeostatsis, supporting spermatogenesis and sperm maturation. The abnormal ESRs signaling is believed to be closely related to reproductive diseases and cancer.</div></div>","PeriodicalId":51106,"journal":{"name":"Journal of Steroid Biochemistry and Molecular Biology","volume":"245 ","pages":"Article 106632"},"PeriodicalIF":2.7,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142649028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Oxysterols in tumor immune microenvironment (TIME) 肿瘤免疫微环境中的氧基甾醇(TIME)。
IF 2.7 2区 生物学
Journal of Steroid Biochemistry and Molecular Biology Pub Date : 2024-11-16 DOI: 10.1016/j.jsbmb.2024.106634
Yuanxin Liu , Jie Qin , Xiaorui Li , Guangzhen Wu
{"title":"Oxysterols in tumor immune microenvironment (TIME)","authors":"Yuanxin Liu ,&nbsp;Jie Qin ,&nbsp;Xiaorui Li ,&nbsp;Guangzhen Wu","doi":"10.1016/j.jsbmb.2024.106634","DOIUrl":"10.1016/j.jsbmb.2024.106634","url":null,"abstract":"<div><div>Oxysterols are compounds generated through oxidative reactions involving cholesterol and other steroid molecules. They play a crucial role in the tumor immune microenvironment by interacting with molecules such as the cell membrane receptor EBI2 and nuclear receptors like LXR and PXR. This interaction regulates immune cell signaling pathways, affecting proliferation, apoptosis, migration, and invasion in tumor-related processes. Activating these receptors alters the function and behavior of immune cells—such as macrophages, T cells, and dendritic cells—within the tumor microenvironment, thus promoting or inhibiting tumor development. Certain oxidized steroids can increase both the number and activation of infiltrating T cells, synergizing with anti-PD-1 to enhance anti-tumor efficacy. An in-depth study of the biological mechanisms of oxidized sterols will not only enhance our understanding of the complexity of the tumor immune microenvironment but may also reveal new therapeutic targets, providing innovative strategies for tumor immunotherapy.</div></div>","PeriodicalId":51106,"journal":{"name":"Journal of Steroid Biochemistry and Molecular Biology","volume":"245 ","pages":"Article 106634"},"PeriodicalIF":2.7,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142648886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The validation of an LC-MS/MS method for the quantification of vitamin D metabolites in human milk and their biological variability in Gambian women 验证用于定量检测冈比亚妇女母乳中维生素 D 代谢物及其生物变异性的 LC-MS/MS 方法。
IF 2.7 2区 生物学
Journal of Steroid Biochemistry and Molecular Biology Pub Date : 2024-11-14 DOI: 10.1016/j.jsbmb.2024.106633
Kerry S. Jones , Sarah R. Meadows , Georgia Billing , Albert Koulman , Ann Prentice
{"title":"The validation of an LC-MS/MS method for the quantification of vitamin D metabolites in human milk and their biological variability in Gambian women","authors":"Kerry S. Jones ,&nbsp;Sarah R. Meadows ,&nbsp;Georgia Billing ,&nbsp;Albert Koulman ,&nbsp;Ann Prentice","doi":"10.1016/j.jsbmb.2024.106633","DOIUrl":"10.1016/j.jsbmb.2024.106633","url":null,"abstract":"<div><div>Vitamin D is required for healthy growth and development, but data on human milk vitamin D content is limited. We describe a liquid chromatography tandem mass spectrometry (LC-MS/MS) method for the analysis of vitamin D metabolites in human milk, and its application in samples collected on two consecutive days from women in rural Gambia. Vitamin D compounds were extracted from 1 mL of milk by liquid-liquid extraction and derivatised with 4-phenyl-1,2,4-triazoline-3,5-dione (PTAD) prior to analysis by LC-MS/MS. The limit of quantification was 0.05 nmol/L for vitamin D<sub>2</sub>, 0.025 nmol/L for vitamin D<sub>3</sub> and 0.1 nmol/L for 25(OH)D<sub>2</sub> and 25(OH)D<sub>3</sub>. Within- and between-day imprecision was &lt;12 % for all analytes except vitamin D<sub>2</sub> (14 %).</div><div>From all data combined, geometric mean (-/+ 1 SD) vitamin D<sub>3</sub> concentration was 0.94 (0.43, 1.80) nmol/L and for 25(OH)D<sub>3</sub> 0.32 (0.23, 0.42) nmol/L. The within-person (intra-individual) coefficient of variation (%CV) was 32 % and 12 % for vitamin D<sub>3</sub> and 25(OH)D<sub>3</sub>, respectively. Between-person (inter-individual) %CVs were 89 % and 34 % for vitamin D<sub>3</sub> and 25(OH)D<sub>3</sub>, respectively. There was no significant association between vitamin D metabolite concentrations and milk fat (creamatocrit). Mean vitamin D content of human milk as ARA averaged 42 IU/L with 25(OH)D<sub>3</sub> responsible for around two-thirds of the biological activity. In conclusion, this work describes a reliable LC-MS/MS method for quantification of vitamin D and 25(OH)D in low volumes of human milk providing a platform for future work. This study contributes to current understanding of variability of milk vitamin D content.</div></div>","PeriodicalId":51106,"journal":{"name":"Journal of Steroid Biochemistry and Molecular Biology","volume":"245 ","pages":"Article 106633"},"PeriodicalIF":2.7,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142640276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Interactions of sphingomyelin with biologically crucial side chain-hydroxylated cholesterol derivatives 鞘磷脂与生物学上至关重要的侧链-羟基化胆固醇衍生物的相互作用。
IF 2.7 2区 生物学
Journal of Steroid Biochemistry and Molecular Biology Pub Date : 2024-11-13 DOI: 10.1016/j.jsbmb.2024.106635
Patrycja Dynarowicz-Latka , Anna Chachaj-Brekiesz , Anita Wnętrzak , Jan Kobierski , Andżelika Półtorak , Dawid Lupa , Ewelina W. Lipiec
{"title":"Interactions of sphingomyelin with biologically crucial side chain-hydroxylated cholesterol derivatives","authors":"Patrycja Dynarowicz-Latka ,&nbsp;Anna Chachaj-Brekiesz ,&nbsp;Anita Wnętrzak ,&nbsp;Jan Kobierski ,&nbsp;Andżelika Półtorak ,&nbsp;Dawid Lupa ,&nbsp;Ewelina W. Lipiec","doi":"10.1016/j.jsbmb.2024.106635","DOIUrl":"10.1016/j.jsbmb.2024.106635","url":null,"abstract":"<div><div>Oxysterols are interesting molecules due to their dual nature, reflecting beneficial and harmful effects on the body. An issue that still needs to be solved is how slight modification of their structure owing to the location of the additional polar group in the molecules affects their biological activity. With this in mind, we selected three side chain-hydroxylated oxysterols namely: 20(<em>S</em>)-hydroxycholesterol (20(<em>S</em>)-OH), 24(<em>S</em>)-hydroxycholesterol (24(<em>S</em>)-OH), and 27-hydroxycholesterol (27-OH), and examined their behavior in mixtures with the bioactive sphingolipid – sphingomyelin (SM). Our research was based on the Langmuir monolayer technique supplemented with molecular dynamics (MD) and microscopic observation of the films texture (Brewster angle microscopy, BAM, and atomic force microscopy, AFM). Additionally, since 20(<em>S</em>)-hydroxycholesterol has not been studied so far, we thoroughly characterized this oxysterol in one-component monolayers. Our studies showed differences in the interactions of the studied oxysterols and sphingomyelin. Namely, it was found that 20(<em>S</em>)-OH binds to SM, unlike 24(<em>S</em>)-OH and 27-OH, which both weakly interact with SM. This distinct behavior was interpreted within the molecular dynamics as being due to weak intermolecular interactions between 20(<em>S</em>)-OH molecules, which allowed easy incorporation of SM into the 20(<em>S</em>)-OH monolayer. In contrast, the strong oxysterol-oxysterol interactions occurring in monolayers with 24(<em>S</em>)-OH or 27-OH make this process more difficult. This may be important in the process of bone formation/resorption. Other aspects derived from our study are: <em>(i)</em> the tendency of oxysterols to incorporate into lipid rafts (leading to their modification in structure and function), as well as <em>(ii)</em> the formation of multilayer structures, in which oxysterols are arranged in the characteristic forms of “strings of beads”, which may facilitate their transport across the membrane.</div></div>","PeriodicalId":51106,"journal":{"name":"Journal of Steroid Biochemistry and Molecular Biology","volume":"245 ","pages":"Article 106635"},"PeriodicalIF":2.7,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142640273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Steroid receptors in hormone dependent or sensitive cancers: The field of play now and looking forward 激素依赖性或敏感性癌症中的类固醇受体:现在和展望未来
IF 2.7 2区 生物学
Journal of Steroid Biochemistry and Molecular Biology Pub Date : 2024-11-13 DOI: 10.1016/j.jsbmb.2024.106637
Donita Africander, Theresa Hickey
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