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Polat S, Karaburgu S, Unluhizarci K, Dundar M, Ozkul Y, Arslan YK, Karaca Z, Kelestimur F. Unexpectedly high mutation rate of cyp11b1 compared to cyp21a2 in randomly-selected turkish women: a large screening study. J Endocrinol Invest 2023; 46:2367-2377. [PMID: 37055708 DOI: 10.1007/s40618-023-02093-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 04/06/2023] [Indexed: 04/15/2023]
Abstract
PURPOSE Congenital adrenal hyperplasia (CAH) is a group of autosomal recessive disorders resulting from enzyme deficiencies associated with steroidogenesis. The clinical presentation of non-classic CAH (NCAH) in females is often indistinguishable from other hyperandrogenic disorders like polycystic ovary syndrome (PCOS). The data on the prevalence of NCAH in unselected women in the literature is scanty. The research aimed to evaluate the prevalence of NCAH, carrier frequencies, and the correlation between clinical symptoms and genotype in Turkish women. METHODS The study group comprised two hundred and seventy randomly-selected unrelated asymptomatic women of reproductive age (18-45). Subjects were recruited from female blood donors. All volunteers underwent clinical examination and hormone measurements. The protein-encoding exons and exon-intron boundaries of the CYP21A2, CYP11B1, HSD3β2 and CYP21A2 promoter were sequenced by direct DNA sequencing. RESULTS After genotyping, seven (2.2%) individuals were diagnosed with NCAH. The heterozygous carrier frequencies of CYP21A2, CYP21A2 promoter, CYP11B1, and HSD3β2 genes with 34, 34, 41, and 1 pathologic mutation were determined at 12.6%, 12.6%, 15.2%, and 0.37% of volunteers, respectively. Gene-conversion (GC) frequencies between CYP21A2/CYP21A1P and CYP11B1/CYP11B2 were determined as 10.4% and 14.8%, respectively. CONCLUSION Despite GC-derived higher mutation frequency determined in the CYP11B1 gene, the reason for the low frequency of NCAH due to 11OHD compared to 21OHD might be that gene-conversion arises with active CYP11B2 rather than an inactive pseudogene. HSD3β1 exhibits high homology with HSD3β2 located on the same chromosome; remarkably, it demonstrates low heterozygosity and no GC, most probably the outcome of a tissue-specific expression pattern.
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Affiliation(s)
- S Polat
- Department of Medical Genetics, Medical Faculty, Erzincan Binali Yıldırım University, Basbaglar Mah., 24100, Erzincan, Merkez, Turkey.
| | - S Karaburgu
- Department of Endocrinology, Medical Faculty, Erciyes University, Kayseri, Turkey
| | - K Unluhizarci
- Department of Endocrinology, Medical Faculty, Erciyes University, Kayseri, Turkey
| | - M Dundar
- Department of Medical Genetics, Medical Faculty, Erciyes University, Kayseri, Turkey
| | - Y Ozkul
- Department of Medical Genetics, Medical Faculty, Erciyes University, Kayseri, Turkey
| | - Y K Arslan
- Department of Biostatistics, Medical Faculty, Çukurova University, Adana, Turkey
| | - Z Karaca
- Department of Endocrinology, Medical Faculty, Erciyes University, Kayseri, Turkey
| | - F Kelestimur
- Department of Endocrinology, Medical Faculty, Erciyes University, Kayseri, Turkey
- Department of Endocrinology, Medical Faculty, Yeditepe University, Istanbul, Turkey
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Feng Y, Lian X, Guo K, Zhang G, Huang X. A comprehensive analysis of metabolomics and transcriptomics to reveal major metabolic pathways and potential biomarkers of human preeclampsia placenta. Front Genet 2022; 13:1010657. [PMID: 36263435 PMCID: PMC9574103 DOI: 10.3389/fgene.2022.1010657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Accepted: 09/14/2022] [Indexed: 11/13/2022] Open
Abstract
Background: The etiology of preeclampsia (PE) remains unclear. With the utilization of metabolomics, dysregulated production of several metabolic components in human plasma, such as lipids, amino acids, androgens and estrogens, was found to be important in the pathogenesis of PE. Transcriptomics adds more in-depth information, and the integration of transcriptomics and metabolomics may yield further insight into PE pathogenesis than either one alone.Objectives: We investigated the placental metabolomics and transcriptomics of PE patients to identify affected metabolic pathways and potential biological targets for exploring the disease pathogenesis.Methods: Integrated transcriptomics and metabolomics were used to analyze five paired human placentas from patients with severe PE and normal pregnancies. This was followed by further validation of our findings in a publicly available dataset of 173 PE vs. 157 control placentas. In addition, weighted gene coexpression network construction was performed to assess the correlation between genetic alterations and diseases.Results: We identified 66 and 41 differentially altered metabolites in negative and positive ion modes, respectively, in the PE group compared to the control group, and found 2,560 differentially expressed genes. Several pathways were aberrantly altered in the PE placenta at both the metabolic and transcriptional levels, including steroid hormone biosynthesis, the cAMP signaling pathway, neuroactive ligand–receptor interactions, taste transduction and prion diseases. Additionally, we found 11 differential metabolites and 11 differentially expressed genes involved in the steroid hormone biosynthesis pathway, indicating impaired metabolism of steroid hormones in the PE placenta. Furthermore, we found that CYP11A1, HSD3B2, and HSD17B6 are highly correlated with diseases.Conclusion: Our findings provide a profile of the dysregulated steroid hormone biosynthesis in PE placenta, we observed a dysregulated cortisol-to-cortisone ratio, testosterone accumulation, decreased testosterone downstream metabolites, impaired production of estrone and estriol, and aberrant hydroxylation and methylation of estradiol. Disorders of placental steroid hormone metabolism might be a consequence or a compensatory change in pathological placentation in PE, which underscores the need to investigate the physiology of steroid hormone metabolites in the etiology of PE.
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Affiliation(s)
- Yan Feng
- Fetal Care Center, Department of Obstetrics and Gynecology, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Xinlei Lian
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, South China Agricultural University, Guangzhou, China
| | - Kaimin Guo
- Department of Obstetrics and Gynecology, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Guanglan Zhang
- Fetal Care Center, Department of Obstetrics and Gynecology, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Xuan Huang
- Fetal Medicine Center, Department of Obstetrics and Gynecology, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
- *Correspondence: Xuan Huang,
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Liu Z, Zhang R, Zhang W, Xu Y. Structure-based rational design of hydroxysteroid dehydrogenases for improving and diversifying steroid synthesis. Crit Rev Biotechnol 2022:1-17. [PMID: 35834355 DOI: 10.1080/07388551.2022.2054770] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
A group of steroidogenic enzymes, hydroxysteroid dehydrogenases are involved in steroid metabolism which is very important in the cell: signaling, growth, reproduction, and energy homeostasis. The enzymes show an inherent function in the interconversion of ketosteroids and hydroxysteroids in a position- and stereospecific manner on the steroid nucleus and side-chains. However, the biocatalysis of steroids reaction is a vital and demanding, yet challenging, task to produce the desired enantiopure products with non-natural substrates or non-natural cofactors, and/or in non-physiological conditions. This has driven the use of protein design strategies to improve their inherent biosynthetic efficiency or activate their silent catalytic ability. In this review, the innate features and catalytic characteristics of enzymes based on sequence-structure-function relationships of steroidogenic enzymes are reviewed. Combining structure information and catalytic mechanisms, progress in protein redesign to stimulate potential function, for example, substrate specificity, cofactor dependence, and catalytic stability are discussed.
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Affiliation(s)
- Zhiyong Liu
- Lab of Brewing Microbiology and Applied Enzymology, School of Biotechnology and Key Laboratory of Industrial Biotechnology of Ministry of Education, Jiangnan University, Wuxi, China
| | - Rongzhen Zhang
- Lab of Brewing Microbiology and Applied Enzymology, School of Biotechnology and Key Laboratory of Industrial Biotechnology of Ministry of Education, Jiangnan University, Wuxi, China
| | - Wenchi Zhang
- Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Yan Xu
- Lab of Brewing Microbiology and Applied Enzymology, School of Biotechnology and Key Laboratory of Industrial Biotechnology of Ministry of Education, Jiangnan University, Wuxi, China
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Gao H, Xu J, Ma Q, Tang F, Ga Q, Li Y, Guan W, Ge RL, Yang YZ. Association Between the Polymorphism of Steroid Hormone Metabolism Genes and High-Altitude Pulmonary Edema in the Chinese Han Population. Int J Gen Med 2022; 15:787-794. [PMID: 35087285 PMCID: PMC8787081 DOI: 10.2147/ijgm.s345495] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Accepted: 12/08/2021] [Indexed: 11/23/2022] Open
Abstract
Purpose Steroid hormone metabolism plays an essential role in high-altitude pulmonary edema (HAPE) progression. This study aimed to investigate the association between polymorphism in seven steroid hormone metabolism genes (STAR, HSD3B1, HSD3B2, CYP17A1, CYP21A2, CYP11B1, and CYP11B2) and HAPE susceptibility among Han Chinese. Patients and Methods A total of 41 tagSNPs in the seven genes were genotyped using Sequenom MassARRAY SNP assays from 169 HAPE patients (HAPE-p) and 309 matched Han Chinese individuals resistant to HAPE (HAPE-r). The genotypic and allele frequencies, odds ratios (ORs), and 95% confidence intervals (95% CIs) were calculated. Results Four SNPs, including the allele C of rs6203 (p = 0.034, OR [95% CI] = 1.344 [1.022−1.767]) in HSD3B1, allele G of rs3740397 (p = 0.044, OR [95% CI] = 1.314 [1.007−1.714]) and allele C of rs10786712 (p = 0.039, OR [95% CI] = 0.751 [0.572−0.986]) in CYP17A1, and allele T of rs6402 (p = 0.006, OR [95% CI] = 0.504 [0.306−0.830]) in CYP11B1, were significantly associated with HAPE. The distribution of the genotypes of these SNPs also significantly differed between the HAPE-p and HAPE-r groups. Moreover, six haplotypes (the linkage disequilibrium block including rs10883783, rs4919686, rs3740397, rs3824755, and rs10786712) of CYP17A1 were also significantly associated with HAPE. Conclusion The four SNPs located in HSD3B1 (rs6203), CYP17A1 (rs3740397 and rs10786712), and CYP11B1 (rs6402) and the six haplotypes of CYP17A1 are likely to have an effect on HAPE.
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Affiliation(s)
- Hui Gao
- Research Center for High Altitude Medical Sciences, School of Medicine, Qinghai University, Qinghai, People’s Republic of China
- Basic Medical Sciences, School of Medicine, Qinghai University, Qinghai, People’s Republic of China
| | - Jin Xu
- Basic Medical Sciences, School of Medicine, Qinghai University, Qinghai, People’s Republic of China
| | - Qiang Ma
- Basic Medical Sciences, School of Medicine, Qinghai University, Qinghai, People’s Republic of China
| | - Feng Tang
- Research Center for High Altitude Medical Sciences, School of Medicine, Qinghai University, Qinghai, People’s Republic of China
| | - Qin Ga
- Research Center for High Altitude Medical Sciences, School of Medicine, Qinghai University, Qinghai, People’s Republic of China
| | - Yuhong Li
- Department of Respiration, Affiliated Hospital, Qinghai University, Qinghai, People’s Republic of China
| | - Wei Guan
- Department of Respiration, Affiliated Hospital, Qinghai University, Qinghai, People’s Republic of China
| | - Ri-Li Ge
- Research Center for High Altitude Medical Sciences, School of Medicine, Qinghai University, Qinghai, People’s Republic of China
| | - Ying-Zhong Yang
- Research Center for High Altitude Medical Sciences, School of Medicine, Qinghai University, Qinghai, People’s Republic of China
- Basic Medical Sciences, School of Medicine, Qinghai University, Qinghai, People’s Republic of China
- Correspondence: Ying-Zhong Yang Tel/Fax +86 971 6143168 Email
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Mannervik B, Ismail A, Lindström H, Sjödin B, Ing NH. Glutathione Transferases as Efficient Ketosteroid Isomerases. Front Mol Biosci 2021; 8:765970. [PMID: 34881290 PMCID: PMC8645602 DOI: 10.3389/fmolb.2021.765970] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 11/01/2021] [Indexed: 01/01/2023] Open
Abstract
In addition to their well-established role in detoxication, glutathione transferases (GSTs) have other biological functions. We are focusing on the ketosteroid isomerase activity, which appears to contribute to steroid hormone biosynthesis in mammalian tissues. A highly efficient GST A3-3 is present in some, but not all, mammals. The alpha class enzyme GST A3-3 in humans and the horse shows the highest catalytic efficiency with kcat/Km values of approximately 107 M-1s-1, ranking close to the most active enzymes known. The expression of GST A3-3 in steroidogenic tissues suggests that the enzyme has evolved to support the activity of 3β-hydroxysteroid dehydrogenase, which catalyzes the formation of 5-androsten-3,17-dione and 5-pregnen-3,20-dione that are substrates for the double-bond isomerization catalyzed by GST A3-3. The dehydrogenase also catalyzes the isomerization, but its kcat of approximately 1 s-1 is 200-fold lower than the kcat values of human and equine GST A3-3. Inhibition of GST A3-3 in progesterone-producing human cells suppress the formation of the hormone. Glutathione serves as a coenzyme contributing a thiolate as a base in the isomerase mechanism, which also involves the active-site Tyr9 and Arg15. These conserved residues are necessary but not sufficient for the ketosteroid isomerase activity. A proper assortment of H-site residues is crucial to efficient catalysis by forming the cavity binding the hydrophobic substrate. It remains to elucidate why some mammals, such as rats and mice, lack GSTs with the prominent ketosteroid isomerase activity found in certain other species. Remarkably, the fruit fly Drosophila melanogaster, expresses a GSTE14 with notable steroid isomerase activity, even though Ser14 has evolved as the active-site residue corresponding to Tyr9 in the mammalian alpha class.
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Affiliation(s)
- Bengt Mannervik
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden
| | - Aram Ismail
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden
| | - Helena Lindström
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden
| | - Birgitta Sjödin
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden
| | - Nancy H. Ing
- Department of Animal Science, Texas A&M AgriLife Research, Texas A&M University, College Station, TX, United States
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Akiyama R, Lee HJ, Nakayasu M, Osakabe K, Osakabe Y, Umemoto N, Saito K, Muranaka T, Sugimoto Y, Mizutani M. Characterization of steroid 5α-reductase involved in α-tomatine biosynthesis in tomatoes. PLANT BIOTECHNOLOGY (TOKYO, JAPAN) 2019; 36:253-263. [PMID: 31983879 PMCID: PMC6978498 DOI: 10.5511/plantbiotechnology.19.1030a] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 10/30/2019] [Indexed: 05/19/2023]
Abstract
α-tomatine and dehydrotomatine are steroidal glycoalkaloids (SGAs) that accumulate in the mature green fruits, leaves, and flowers of tomatoes (Solanum lycopersicum) and function as defensive compounds against pathogens and predators. The aglycones of α-tomatine and dehydrotomatine are tomatidine and dehydrotomatidine (5,6-dehydrogenated tomatidine), and tomatidine is derived from dehydrotomatidine via four reaction steps: C3 oxidation, isomerization, C5α reduction, and C3 reduction. Our previous studies (Lee et al. 2019) revealed that Sl3βHSD is involved in the three reactions except for C5α reduction, and in the present study, we aimed to elucidate the gene responsible for the C5α reduction step in the conversion of dehydrotomatidine to tomatidine. We characterized the two genes, SlS5αR1 and SlS5αR2, which show high homology with DET2, a brassinosteroid 5α reductase of Arabidopsis thaliana. The expression pattern of SlS5αR2 is similar to those of SGA biosynthetic genes, while SlS5αR1 is ubiquitously expressed, suggesting the involvement of SlS5αR2 in SGA biosynthesis. Biochemical analysis of the recombinant proteins revealed that both of SlS5αR1 and SlS5αR2 catalyze the reduction of tomatid-4-en-3-one at C5α to yield tomatid-3-one. Then, SlS5αR1- or SlS5αR2-knockout hairy roots were constructed using CRISPR/Cas9 mediated genome editing. In the SlS5αR2-knockout hairy roots, the α-tomatine level was significantly decreased and dehydrotomatine was accumulated. On the other hand, no change in the amount of α-tomatine was observed in the SlS5αR1-knockout hairy root. These results indicate that SlS5αR2 is responsible for the C5α reduction in α-tomatine biosynthesis and that SlS5αR1 does not significantly contribute to α-tomatine biosynthesis.
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Affiliation(s)
- Ryota Akiyama
- Graduate School of Agricultural Science, Kobe University, 1-1 Rokkoudai, Nada, Kobe, Hyogo 657-8501, Japan
| | - Hyoung Jae Lee
- Graduate School of Agricultural Science, Kobe University, 1-1 Rokkoudai, Nada, Kobe, Hyogo 657-8501, Japan
| | - Masaru Nakayasu
- Graduate School of Agricultural Science, Kobe University, 1-1 Rokkoudai, Nada, Kobe, Hyogo 657-8501, Japan
| | - Keishi Osakabe
- Faculty of Bioscience and Bioindustry, Tokushima University, Tokushima, Japan
| | - Yuriko Osakabe
- Faculty of Bioscience and Bioindustry, Tokushima University, Tokushima, Japan
| | - Naoyuki Umemoto
- RIKEN Center for Sustainable Resource Science, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Kazuki Saito
- RIKEN Center for Sustainable Resource Science, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
- Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan
| | - Toshiya Muranaka
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yukihiro Sugimoto
- Graduate School of Agricultural Science, Kobe University, 1-1 Rokkoudai, Nada, Kobe, Hyogo 657-8501, Japan
| | - Masaharu Mizutani
- Graduate School of Agricultural Science, Kobe University, 1-1 Rokkoudai, Nada, Kobe, Hyogo 657-8501, Japan
- E-mail: Tel: +81-78-803-5885 Fax: +81-78-803-5884
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Frau R, Bortolato M. Repurposing steroidogenesis inhibitors for the therapy of neuropsychiatric disorders: Promises and caveats. Neuropharmacology 2018; 147:55-65. [PMID: 29907425 DOI: 10.1016/j.neuropharm.2018.05.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Revised: 05/07/2018] [Accepted: 05/10/2018] [Indexed: 12/29/2022]
Abstract
Steroids exert a profound influence on behavioral reactivity, by modulating the functions of most neurotransmitters and shaping the impact of stress and sex-related variables on neural processes. This background - as well as the observation that most neuroactive steroids (including sex hormones, glucocorticoids and neurosteroids) are synthetized and metabolized by overlapping enzymatic machineries - points to steroidogenic pathways as a powerful source of targets for neuropsychiatric disorders. Inhibitors of steroidogenic enzymes have been developed and approved for a broad range of genitourinary and endocrine dysfunctions, opening to new opportunities to repurpose these drugs for the treatment of mental problems. In line with this idea, preliminary clinical and preclinical results from our group have shown that inhibitors of key steroidogenic enzymes, such as 5α-reductase and 17,20 desmolase-lyase, may have therapeutic efficacy in specific behavioral disorders associated with dopaminergic hyperfunction. While the lack of specificity of these effects raises potential concerns about endocrine adverse events, these initial findings suggest that steroidogenesis modulators with greater brain specificity may hold significant potential for the development of alternative therapies for psychiatric problems. This article is part of the Special Issue entitled 'Drug Repurposing: old molecules, new ways to fast track drug discovery and development for CNS disorders'.
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Affiliation(s)
- Roberto Frau
- Department of Biomedical Sciences, Division of Neuroscience and Clinical Pharmacology, University of Cagliari, Monserrato CA, Italy; Tourette Syndrome Center, University of Cagliari, Monserrato CA, Italy; Sleep Medicine Center, University of Cagliari, Monserrato CA, Italy; National Institute of Neuroscience (INN), University of Cagliari, Monserrato CA, Italy.
| | - Marco Bortolato
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Utah, Salt Lake City, UT, USA.
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Liang JJ, Rasmusson AM. Overview of the Molecular Steps in Steroidogenesis of the GABAergic Neurosteroids Allopregnanolone and Pregnanolone. CHRONIC STRESS (THOUSAND OAKS, CALIF.) 2018; 2:2470547018818555. [PMID: 32440589 PMCID: PMC7219929 DOI: 10.1177/2470547018818555] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 11/19/2018] [Indexed: 12/23/2022]
Abstract
Allopregnanolone and pregnanolone-neurosteroids synthesized from progesterone in the brain, adrenal gland, ovary and testis-have been implicated in a range of neuropsychiatric conditions including seizure disorders, post-traumatic stress disorder, major depression, post-partum depression, pre-menstrual dysphoric disorder, chronic pain, Parkinson's disease, Alzheimer's disease, neurotrauma, and stroke. Allopregnanolone and pregnanolone equipotently facilitate the effects of gamma-amino-butyric acid (GABA) at GABAA receptors, and when sulfated, antagonize N-methyl-D-aspartate receptors. They play myriad roles in neurophysiological homeostasis and adaptation to stress while exerting anxiolytic, antidepressant, anti-nociceptive, anticonvulsant, anti-inflammatory, sleep promoting, memory stabilizing, neuroprotective, pro-myelinating, and neurogenic effects. Given that these neurosteroids are synthesized de novo on demand, this review details the molecular steps involved in the biochemical conversion of cholesterol to allopregnanolone and pregnanolone within steroidogenic cells. Although much is known about the early steps in neurosteroidogenesis, less is known about transcriptional, translational, and post-translational processes in allopregnanolone- and pregnanolone-specific synthesis. Further research to elucidate these mechanisms as well as to optimize the timing and dose of interventions aimed at altering the synthesis or levels of these neurosteroids is much needed. This should include the development of novel therapeutics for the many neuropsychiatric conditions to which dysregulation of these neurosteroids contributes.
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Affiliation(s)
| | - Ann M. Rasmusson
- Boston
University School of Medicine, Boston, MA,
USA
- National Center for PTSD, Women’s Health
Science Division, Department of Veterans Affairs, Boston, MA, USA
- VA Boston Healthcare System, Boston, MA,
USA
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9
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Pham JH, Will CM, Mack VL, Halbert M, Conner EA, Bucholtz KM, Thomas JL. Structure-function relationships for the selective inhibition of human 3β-hydroxysteroid dehydrogenase type 1 by a novel androgen analog. J Steroid Biochem Mol Biol 2017; 174:257-264. [PMID: 29031687 DOI: 10.1016/j.jsbmb.2017.10.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Revised: 10/02/2017] [Accepted: 10/05/2017] [Indexed: 11/26/2022]
Abstract
3β-Hydroxysteroid dehydrogenase type 1 (3β-HSD1) is selectively expressed in human placenta, mammary glands and breast tumors in women. Human 3β-HSD2 is selectively expressed in adrenal glands and ovaries. Based on AutoDock 3 and 4 results, we have exploited key differences in the amino acid sequences of 3β-HSD1 (Ser194, Arg195) and 3β-HSD2 (Gly194, Pro195) by designing a selective inhibitor of 3β-HSD1. 2,16-Dicyano-4,5-epoxy-androstane-3,17-dione (16-cyano-17-keto-trilostane or DiCN-AND) was synthesized in a 4-step procedure from androstenedione. In purified 3β-HSD inhibition studies, DiCN-AND competitively inhibited 3β- HSD1 with Ki=4.7μM and noncompetitively inhibited 3β-HSD2 with a 6.5-fold higher Ki=30.7μM. We previously reported similar isoenzyme-specific inhibition profiles for trilostane. Based on our docking results, we created, expressed and purified the chimeric S194G-1 mutant of 3β-HSD1. Trilostane inhibited S194G-1 (Ki=0.67μM) with a noncompetitive mode compared to its 6.7-fold higher affinity, competitive inhibition of 3β-HSD1 (Ki=0.10μM). DiCN-AND inhibited S194G-1 with a 6.3-fold higher Ki (29.5μM) than measured for 3β-HSD1 (Ki=4.7μM) but with the same competitive mode for both enzyme species. Since DiCN-AND noncompetitively inhibits 3β-HSD2, which has the Gly194 and Pro195 of 3β-HSD2 in place of the Ser194 and Arg195 in 3β-HSD1, this suggests that Arg195 alone in 3β-HSD1 or S194G-1 is required to bind DiCN-AND in the substrate binding site (competitive inhibition). However, both Ser194 and Arg195 are required to bind trilostane in the 3β-HSD1 substrate site based on its noncompetitive inhibition of S194G-1 and 3β-HSD2. In support of this hypothesis, DiCN-AND inhibited our chimeric R195P-1 mutant noncompetitively with a Ki=41.3μM (similar to the 3β-HSD2 inhibition profile). Since DiCN-AND competitively inhibited S194G-1 that still contains R195 but noncompetitively inhibited R195P-1 that still contains S194, our data provides strong evidence that the Arg195 being mutated to Pro195 (as present in 3β-HSD2) shifts the inhibition mode from competitive to noncompetitive in 3β-HSD1. This supports the key role of Arg195 in 3β-HSD1 for the high affinity, competitive binding of the trilostane analogs. Our new structure/function information for the design of targeted 3β-HSD1 inhibitors may lead to important new treatments for the prevention of spontaneous premature birth.
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Affiliation(s)
- Jenny H Pham
- Department of Biomedical Sciences, Macon, GA, 31207, USA
| | - Catherine M Will
- Department of Chemistry, Mercer University, Macon, GA, 31207, USA
| | - Vance L Mack
- Department of Biomedical Sciences, Macon, GA, 31207, USA
| | - Matthew Halbert
- Department of Chemistry, Mercer University, Macon, GA, 31207, USA
| | | | - Kevin M Bucholtz
- Department of Chemistry, Mercer University, Macon, GA, 31207, USA
| | - James L Thomas
- Department of Biomedical Sciences, Macon, GA, 31207, USA; Department of Ob-Gyn, Mercer University School of Medicine, Macon, GA, 31207, USA.
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Wang X, Wang G, Li X, Liu J, Hong T, Zhu Q, Huang P, Ge RS. Suppression of rat and human androgen biosynthetic enzymes by apigenin: Possible use for the treatment of prostate cancer. Fitoterapia 2016; 111:66-72. [PMID: 27102611 DOI: 10.1016/j.fitote.2016.04.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Revised: 04/15/2016] [Accepted: 04/17/2016] [Indexed: 11/30/2022]
Abstract
Apigenin is a natural flavone. It has recently been used as a chemopreventive agent. It may also have some beneficial effects to treat prostate cancer by inhibiting androgen production. The objective of the present study was to investigate the effects of apigenin on the steroidogenesis of rat immature Leydig cells and some human testosterone biosynthetic enzyme activities. Rat immature Leydig cells were incubated for 3h with 100μM apigenin without (basal) or with 1ng/ml luteinizing hormone (LH), 10mM 8-bromoadenosine 3',5'-cyclic monophosphate (8BR), and 20μM of the following steroid substrates: 22R-hydroxychloesterol (22R), pregnenolone (P5), progesterone (P4), and androstenedione (D4). The medium levels of 5α-androstane-3α, 17β-diol (DIOL), the primary androgen produced by rat immature Leydig cells, were measured. Apigenin significantly inhibited basal, 8BR, 22R, PREG, P4, and D4 stimulated DIOL production in rat immature Leydig cells. Further study showed that apigenin inhibited rat 3β-hydroxysteroid dehydrogenase, 17α-hydroxylase/17, 20-lyase, and 17β-hydroxysteroid dehydrogenase 3 with IC50 values of 11.41±0.7, 8.98±0.10, and 9.37±0.07μM, respectively. Apigenin inhibited human 3β-hydroxysteroid dehydrogenase and 17β-hydroxysteroid dehydrogenase 3 with IC50 values of 2.17±0.04 and 1.31±0.09μM, respectively. Apigenin is a potent inhibitor of rat and human steroidogenic enzymes, being possible use for the treatment of prostate cancer.
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Affiliation(s)
- Xiudi Wang
- Centre of Scientific Research, The Second Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325027, China
| | - Guimin Wang
- Centre of Scientific Research, The Second Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325027, China
| | - Xiaoheng Li
- Centre of Scientific Research, The Second Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325027, China
| | - Jianpeng Liu
- Centre of Scientific Research, The Second Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325027, China
| | - Tingting Hong
- Centre of Scientific Research, The Second Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325027, China
| | - Qiqi Zhu
- Centre of Scientific Research, The Second Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325027, China
| | - Ping Huang
- Department of Pharmacy, Zhejiang Cancer Hospital, Hangzhou, Zhejiang 310022, China.
| | - Ren-Shan Ge
- Centre of Scientific Research, The Second Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325027, China.
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11
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Thomas JL, Bose HS. Regulation of human 3-beta-hydroxysteroid dehydrogenase type-2 (3βHSD2) by molecular chaperones and the mitochondrial environment affects steroidogenesis. J Steroid Biochem Mol Biol 2015; 151:74-84. [PMID: 25448736 DOI: 10.1016/j.jsbmb.2014.11.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Revised: 10/09/2014] [Accepted: 11/19/2014] [Indexed: 10/24/2022]
Abstract
Human 3-β-hydroxysteroid dehydrogenase/isomerase types 1 and 2 (3βHSD1 and 3βHSD2, respectively) are expressed in a tissue-specific pattern by different genes. Site-directed mutagenesis studies have confirmed the function of the catalytic amino acids (Tyr154, Lys 158, Ser124 in both isoenzymes), substrate/inhibitor isoform-specific residues (His156 and Arg195 in 3βHSD1) and cofactor binding residues (Asp36 provides NAD(+) specificity in both isoenzymes). However, detailed analysis of isoform-specific organelle localization and characterization is difficult due to the 93% amino acid identity between the two isoforms. With recent advances in the knowledge of mitochondrial architecture and localization of the various translocases, our laboratory has studied the mechanisms regulating mitochondrial 3βHSD2 localization. The mitochondrial N-terminal leader sequence of 3βHSD2 directs its entry into the mitochondria where it is localized to the intermembrane space (IMS). Unlike other mitochondrial proteins, the N-terminal signal sequence of 3βHSD2 is not cleaved upon mitochondrial import. 3βHSD2 interacts with the mitochondrial translocase, Tim50, to regulate progesterone and androstenedione formation. Our studies suggest that its activity at the IMS is facilitated in a partially unfolded "molten globule" conformation by the proton pump between the matrix and IMS. The unfolded protein is refolded by the mitochondrial chaperones. The protons at the IMS are absorbed by the lipid vesicles, to maintain the proton pump and recycle 3βHSD2. As a result, one molecule of 3βHSD2 may participate in multiple catalytic reactions. In summary, the steroidogenic cell recycles 3βHSD2 to catalyze the reactions needed to produce androstenedione, progesterone and 17α-hydroxyprogesterone on demand in coordination with the mitochondrial translocase, Tim50. This article is part of a Special Issue entitled 'Steroid/Sterol signaling'.
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Affiliation(s)
- James L Thomas
- Division of Basic Medical Sciences, Mercer University School of Medicine, Macon, GA 31207, USA
| | - Himangshu S Bose
- Departments of Biochemistry, Biomedical Sciences, Mercer University School of Medicine, Savannah, GA 31404, USA; Memorial University Medical Center, Anderson Cancer Institute, Savannah, GA 31404, USA.
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12
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Ye L, Guo J, Ge RS. Environmental pollutants and hydroxysteroid dehydrogenases. VITAMINS AND HORMONES 2014; 94:349-90. [PMID: 24388197 DOI: 10.1016/b978-0-12-800095-3.00013-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Hydroxysteroid dehydrogenases (HSD) are a group of steroidogenic enzymes that are involved in the steroid biosynthesis and metabolism. Four classes of HSDs, namely, 3β-, 11β-, 17β-, and 20α-HSDs, are discussed. 3β-HSDs catalyze the conversion of pregnenolone, 17α-hydroxypregnenolone, and dehydroepiandrosterone to progesterone, 17α-hydroxyprogesterone, and androstenedione, respectively. 11β-HSDs catalyze the interconversion between active cortisol and inactive cortisone. 17β-HSDs catalyze the interconversion between 17β-hydroxyl steroids and 17-ketoandrogens and estrogens. 20α-HSDs catalyze the conversion of progesterone into 20α-hydroxyprogesterone. Many environmental pollutants directly inhibit one or more enzymes of these HSDs, thus interfering with endogenous active steroid hormone levels. These chemicals include industrial materials (perfluoroalkyl compounds, phthalates, bisphenol A, and benzophenone), pesticides/biocides (methoxychlor, organotins, 1,2-dibromo-3-chloropropane, and prochloraz), and plant constituents (genistein, gossypol, and licorice). This chapter reviews these inhibitors targeting on HSDs.
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Affiliation(s)
- Leping Ye
- The 2nd Affiliated Hospital and Research Academy of Reproductive Biomedicine of Wenzhou Medical University, Wenzhou, Zhejiang, PR China
| | - Jingjing Guo
- The 2nd Affiliated Hospital and Research Academy of Reproductive Biomedicine of Wenzhou Medical University, Wenzhou, Zhejiang, PR China
| | - Ren-Shan Ge
- The 2nd Affiliated Hospital and Research Academy of Reproductive Biomedicine of Wenzhou Medical University, Wenzhou, Zhejiang, PR China.
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Rajapaksha M, Thomas JL, Streeter M, Prasad M, Whittal RM, Bell JD, Bose HS. Lipid-mediated unfolding of 3β-hydroxysteroid dehydrogenase 2 is essential for steroidogenic activity. Biochemistry 2011; 50:11015-24. [PMID: 22106846 DOI: 10.1021/bi2016102] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
For inner mitochondrial membrane (IMM) proteins that do not undergo N-terminal cleavage, the activity may occur in the absence of a receptor present in the mitochondrial membrane. One such protein is human 3β-hydroxysteroid dehydrogenase 2 (3βHSD2), the IMM resident protein responsible for catalyzing two key steps in steroid metabolism: the conversion of pregnenolone to progesterone and dehydroepiandrosterone to androstenedione. Conversion requires that 3βHSD2 serve as both a dehydrogenase and an isomerase. The dual functionality of 3βHSD2 results from a conformational change, but the trigger for this change remains unknown. Using fluorescence resonance energy transfer, we found that 3βHSD2 interacted strongly with a mixture of dipalmitoylphosphatidylglycerol (DPPG) and dipalmitoylphosphatidylcholine (DPPC). 3βHSD2 became less stable when incubated with the individual lipids, as indicated by the decrease in thermal denaturation (T(m)) from 42 to 37 °C. DPPG, alone or in combination with DPPC, led to a decrease in α-helical content without an effect on the β-sheet conformation. With the exception of the 20 N-terminal amino acids, mixed vesicles protected 3βHSD2 from trypsin digestion. However, protein incubated with DPPC was only partially protected. The lipid-mediated unfolding completely supports the model in which a cavity forms between the α-helix and β-sheet. As 3βHSD2 lacks a receptor, opening the conformation may activate the protein.
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Affiliation(s)
- Maheshinie Rajapaksha
- Mercer University School of Medicine and Memorial University Medical Center, Savannah, Georgia 31404, United States
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14
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Thomas JL, Bucholtz KM, Kacsoh B. Selective inhibition of human 3β-hydroxysteroid dehydrogenase type 1 as a potential treatment for breast cancer. J Steroid Biochem Mol Biol 2011; 125:57-65. [PMID: 20736065 PMCID: PMC2999670 DOI: 10.1016/j.jsbmb.2010.08.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2010] [Revised: 07/02/2010] [Accepted: 08/12/2010] [Indexed: 10/19/2022]
Abstract
Human 3β-hydroxysteroid dehydrogenase/isomerase type 1 (3β-HSD1) is a critical enzyme in the conversion of DHEA to estradiol in breast tumors and may be a target enzyme for inhibition in the treatment of breast cancer in postmenopausal women. Human 3β-HSD2 participates in the production of cortisol and aldosterone in the human adrenal gland in this population. In our recombinant human breast tumor MCF-7 Tet-off cells that express either 3β-HSD1 or 3β-HSD2, trilostane and epostane inhibit the DHEA-induced proliferation of MCF-7 3β-HSD1 cells with 12-16-fold lower IC(50) values compared to the MCF-7 3β-HSD2 cells. Trilostane and epostane also competitively inhibit purified human 3β-HSD1 with 12-16-fold lower K(i) values compared to the noncompetitive K(i) values measured for human 3β-HSD2. Using our structural model of 3β-HSD1, trilostane was docked in the active site of 3β-HSD1, and Arg195 in 3β-HSD1 or Pro195 in 3β-HSD2 was identified as a potentially critical residue. The R195P-1 mutant of 3β-HSD1 and the P195R-2 mutant of 3β-HSD2 were created, expressed and purified. Kinetic analyses of enzyme inhibition suggest that the high-affinity, competitive inhibition of 3β-HSD1 by trilostane may be related to the presence of Arg195 in 3β-HSD1 versus Pro195 in 3β-HSD2. In addition, His156 in 3β-HSD1 may play a role in the higher affinity of 3β-HSD1 for substrates and inhibitors compared to 3β-HSD2 containing Try156. Structural modeling of the 3β-HSD1 dimer identified a possible interaction between His156 on one subunit and Gln105 on the other. Kinetic analyses of the H156Y-1, Q105M-1 and Q105M-2 support subunit interactions that contribute to the higher affinity of 3β-HSD1 for the inhibitor, epostane, compared to 3β-HSD2. Article from the Special issue on Targeted Inhibitors.
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Affiliation(s)
- James L Thomas
- Division of Basic Medical Sciences, Mercer University School of Medicine, 1550 College St, Macon, GA 31207, USA. Thomas
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Shimodaira M, Nakayama T, Sato N, Aoi N, Sato M, Izumi Y, Soma M, Matsumoto K. Association of HSD3B1 and HSD3B2 gene polymorphisms with essential hypertension, aldosterone level, and left ventricular structure. Eur J Endocrinol 2010; 163:671-80. [PMID: 20660004 DOI: 10.1530/eje-10-0428] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND HSD3B1 and HSD3B2 are crucial enzymes for the synthesis of hormonal steroids, including aldosterone. Therefore, HSD3B gene variations could possibly influence blood pressure (BP) by affecting the aldosterone level. METHODS We performed a haplotype- and diplotype-based case-control study to investigate the association between the HSD3B gene variations and essential hypertension (EH), aldosterone level, and left ventricular hypertrophy (LVH). A total of 275 EH patients and 286 controls were genotyped for four SNPs of the HSD3B1 gene (rs3765945, rs3088283, rs6203, and rs1047303) and for two SNPs of the HSD3B2 gene (rs2854964 and rs1819698). Aldosterone and LVH were investigated in 240 and 110 subjects respectively. RESULTS Significant differences were noted for the total and the male subject groups for the recessive model (CC versus TC+TT) of rs6203 between the controls and EH patients (P=0.030 and P=0.008 respectively). The frequency of the T-C haplotype established by rs3088283-rs1047303 was significantly higher for EH patients compared with the controls (P=0.014). Even though the polymorphism of HSB3B1 was not associated with LVH, the diplotype established by rs3088283-rs1047303 in the total subject group, along with the systolic BP, diastolic BP, and aldosterone level were significantly higher for those subjects who had the T-C haplotype versus those who did not (P=0.025, P=0.014, and P=0.006 respectively). CONCLUSION rs6203 and rs1047303 in the HSD3B1 gene are useful genetic markers for EH, while polymorphisms of HSD3B1 are associated with the BP and aldosterone level.
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Affiliation(s)
- Masanori Shimodaira
- Division of Laboratory Medicine, Department of Pathology of Microbiology, Nihon University School of Medicine, Itabashi-ku, Tokyo, Japan
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16
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Goosen P, Swart AC, Storbeck KH, Swart P. Hypocortisolism in the South African angora goat: the role of 3betaHSD. Mol Cell Endocrinol 2010; 315:182-7. [PMID: 19660520 DOI: 10.1016/j.mce.2009.07.026] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2009] [Accepted: 07/23/2009] [Indexed: 11/25/2022]
Abstract
South African Angora goats are susceptible to cold stress, due to their inability to produce sufficient levels of cortisol. During adrenal steroidogenesis the production of cortisol relies on the activity of two key enzymes, namely cytochrome P450 17alpha-hydroxylase and 3beta-hydroxysteroid dehydrogenase. Cytochrome P450 17alpha-hydroxylase has previously been identified as a factor contributing to hypocortisolism in the South African Angora goat. In this comparative study, the catalytic activity of Angora and ovine 3beta-hydroxysteroid dehydrogenase, which differ by five amino acid residues, was characterized. The conversion of 17-hydroxypregnenolone and dehydroepiandosterone to their corresponding products, 17-hydroxyprogesterone and androstenedione, by the two enzymes differed significantly. The enzymes were subsequently co-expressed with Angora P450 17alpha-hydroxylase. Major differences were observed in pregnenolone metabolism with a significant reduction in the formation of the cortisol precursor, 17-hydroxyprogesterone, by cells expressing Angora 3beta-hydroxysteroid dehydrogenase, implicating 3beta-hydroxysteroid dehydrogenase as an additional factor contributing to hypocortisolism in the South African Angora goat.
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Affiliation(s)
- Pierre Goosen
- Department of Biochemistry, University of Stellenbosch, Stellenbosch 7602, South Africa
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17
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Steroid biosynthesis and renal excretion in human essential hypertension: association with blood pressure and endogenous ouabain. Am J Hypertens 2009; 22:357-63. [PMID: 19197249 DOI: 10.1038/ajh.2009.3] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
BACKGROUND Endogenous ouabain (EO) has been linked with long-term changes in sodium balance and cardiovascular structure and function. The biosynthesis of EO involves, cholesterol side-chain cleavage (CYP11A1), 3-beta-hydroxysteroid dehydrogenase (HSD3B) with sequential metabolism of pregnenolone and progesterone. Furthermore, the renal excretion of cardiac glycosides is mediated by the organic anion transporter (SLCO4C1) at the basolateral membrane and the P-glycoprotein (PGP) (encoded by MDR1) at the apical membrane of the nephron. METHODS Average 24-h ambulatory blood pressures were recorded in 729 untreated essential hypertensives. Aldosterone (Aldo), EO, urinary Na+, and K+ excretions were determined. Single-nucleotide polymorphism (SNP) and haplotype-based association study was performed with a total of 26 informative SNPs. RESULTS Plasma EO was significantly directly related to both day (r = 0.131, P < 0.01) and nighttime diastolic blood pressure (DBP) (r = 0.143, P < 0.01), and remained significantly related after correction for confounders (sex, body mass index, age). Genotype analysis for EO levels and daytime DBP gave significant results for CYP11A1 rs11638442 and MDR1 rs1045642 (T/C Ile1145) in which the minor allele tracked with higher EO levels (T/T 210.3 (147-272) vs. C/C 270.7 (193-366) pmol/l, P < 0.001). Association was found between HSD3B1 polymorphisms and/or haplotypes with blood pressure (systolic blood pressure (SBP) 140.3 (11.7) vs. 143.8 (11.2) mm Hg, P < 0.01) and plasma Aldo (P < 0.05). Haplotype-based analyses support the data of SNP analysis. CONCLUSIONS Among patients with essential hypertension, cholesterol side-chain cleavage and MDR1 loci are related to circulating EO and DBP, most likely by influencing EO synthesis and transmembrane transport, respectively. In contrast, variants in HSD3B1 are related with SBP probably via Aldo.
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18
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Thomas JL, Bucholtz KM, Sun J, Mack VL, Kacsoh B. Structural basis for the selective inhibition of human 3beta-hydroxysteroid dehydrogenase 1 in human breast tumor MCF-7 cells. Mol Cell Endocrinol 2009; 301:174-82. [PMID: 18955108 PMCID: PMC2667100 DOI: 10.1016/j.mce.2008.09.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2008] [Revised: 09/03/2008] [Accepted: 09/05/2008] [Indexed: 11/23/2022]
Abstract
Human 3beta-hydroxysteroid dehydrogenase/isomerase type 1 (3beta-HSD1) is a critical enzyme in the conversion of DHEA to estradiol in breast tumors and may be a target enzyme for inhibition in the treatment of breast cancer in postmenopausal women. Human 3beta-HSD2 participates in the production of cortisol and aldosterone in the human adrenal gland in this population. In our recombinant human breast tumor MCF-7 Tet-off cells that express either 3beta-HSD1 or 3beta-HSD2, trilostane and epostane inhibit the DHEA-induced proliferation of MCF-7 3beta-HSD1 cells with 12- to 16-fold lower IC(50) values compared to the MCF-7 3beta-HSD2 cells. The compounds also competitively inhibit purified human 3beta-HSD1 with 12- to 16-fold lower K(i) values compared to the noncompetitive K(i) values measured for human 3beta-HSD2. Using our structural model of 3beta-HSD1, trilostane or 17beta-acetoxy-trilostane was docked in the active site of 3beta-HSD1, and Arg195 in 3beta-HSD1 or Pro195 in 3beta-HSD2 was identified as a potentially critical residue (one of 23 non-identical residues in the two isoenzymes). The P195R mutant of 3beta-HSD2 were created, expressed and purified. Kinetic analyses of enzyme inhibition suggest that the high affinity, competitive inhibition of 3beta-HSD1 by trilostane and epostane may be related to the presence of Arg195 in 3beta-HSD1 vs. Pro195 in 3beta-HSD2.
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Affiliation(s)
- James L Thomas
- Division of Basic Medical Sciences, Mercer University School of Medicine, Mercer University, 1550 College Street, Macon, GA 31207, USA.
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19
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Targeting human glutathione transferase A3-3 attenuates progesterone production in human steroidogenic cells. Biochem J 2008; 414:103-9. [DOI: 10.1042/bj20080397] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
hGSTA3-3 (human Alpha-class glutathione transferase 3-3) efficiently catalyses steroid Δ5–Δ4 double-bond isomerization in vitro, using glutathione as a cofactor. This chemical transformation is an obligatory reaction in the biosynthesis of steroid hormones and follows the oxidation of 3β-hydroxysteroids catalysed by 3β-HSD (3β-hydroxysteroid dehydrogenase). The isomerization has commonly been ascribed to a supplementary function of 3β-HSD. The present study is the first to provide evidence that hGSTA3-3 contributes to this step in steroid hormone biosynthesis in complex cellular systems. First, we find glutathione-dependent Δ5–Δ4 isomerase activity in whole-cell extracts prepared from human steroidogenic cells. Secondly, effective inhibitors of hGSTA3-3 dramatically decrease the conversion of Δ5-androstene-3,17-dione into Δ4-androstene-3,17-dione in cell lysates. Thirdly, we show that RNAi (RNA interference) targeting hGSTA3-3 expression decreases by 30% the forskolin-stimulated production of the steroid hormone progesterone in a human placental cell line. This effect is achieved at low concentrations of two small interfering RNAs directed against distinct regions of hGSTA3-3 mRNA, and is weaker in unstimulated cells, in which hGSTA3-3 expression is low. The results concordantly show that hGSTA3-3 makes a significant contribution to the double-bond isomerization necessary for steroid hormone biosynthesis and thereby complements the indispensable 3β-hydroxysteroid oxidoreductase activity of 3β-HSD. The results indicate that the lower isomerase activity of 3β-HSD is insufficient for maximal rate of cellular sex hormone production and identify hGSTA3-3 as a possible target for pharmaceutical intervention in steroid hormone-dependent diseases.
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Thomas JL, Mack VL, Glow JA, Moshkelani D, Terrell JR, Bucholtz KM. Structure/function of the inhibition of human 3beta-hydroxysteroid dehydrogenase type 1 and type 2 by trilostane. J Steroid Biochem Mol Biol 2008; 111:66-73. [PMID: 18524572 PMCID: PMC2580795 DOI: 10.1016/j.jsbmb.2008.04.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2007] [Revised: 04/07/2008] [Accepted: 04/18/2008] [Indexed: 10/22/2022]
Abstract
The human type 1 (placenta, breast tumors) and type 2 (gonads, adrenals) isoforms of 3beta-hydroxysteroid dehydrogenase/isomerase (3beta-HSD) are key enzymes in biosynthesis of all active steroid hormones. Human 3beta-HSD1 is a critical enzyme in the conversion of DHEA to estradiol in breast tumors and may be a major target enzyme for the treatment of breast cancer. 3beta-HSD2 participates in the production of cortisol and aldosterone in the human adrenal gland. The goals of this project are to evaluate the role of the 2alpha-cyano group on trilostane (2alpha-cyano-4alpha,5alpha-epoxy-17beta-ol-androstane-3-one) and determine which amino acids may be critical for 3beta-HSD1 specificity. Trilostane without the 2alpha-cyano group, 4alpha,5alpha-epoxy-testosterone, was synthesized. Using our structural model of 3beta-HSD1, trilostane or 4alpha,5alpha-epoxy-testosterone was docked in the active site using Autodock 3.0, and the potentially critical residues (Met187 and Ser124) were identified. The M187T and S124T mutants of 3beta-HSD1 were created, expressed and purified. Dixon analyses of the inhibition of wild-type 3beta-HSD1, 3beta-HSD2, M187T and S124T by trilostane and 4alpha,5alpha-epoxy-testosterone suggest that the 2alpha-cyano group of trilostane is anchored by Ser124 in both isoenzymes. Kinetic analyses of cofactor and substrate utilization as well as the inhibition kinetics of M187T and the wild-type enzymes suggest that the 16-fold higher-affinity inhibition of 3beta-HSD1 by trilostane may be related to the presence of Met187 in 3beta-HSD1 and Thr187 in 3beta-HSD2. This structure/function information may lead to the production of more highly specific inhibitors of 3beta-HSD1 to block the hormone-dependent growth of breast tumors.
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Affiliation(s)
- James L Thomas
- Division of Basic Medical Sciences, Mercer University School of Medicine, 1550 College Street, Macon, GA 31207, USA.
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Mostaghel EA, Nelson PS. Intracrine androgen metabolism in prostate cancer progression: mechanisms of castration resistance and therapeutic implications. Best Pract Res Clin Endocrinol Metab 2008; 22:243-58. [PMID: 18471783 PMCID: PMC2474812 DOI: 10.1016/j.beem.2008.01.003] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Residual tissue androgens are consistently detected within the prostate tumors of castrate individuals and are thought to play a critical role in facilitating the androgen receptor-mediated signaling pathways leading to disease progression. The source of residual tumor androgens is attributed in part to the uptake and conversion of circulating adrenal androgens. Whether the de novo biosynthesis of androgens from cholesterol or earlier precursors occurs within prostatic tumors is not known, but it has significant implications for treatment strategies targeting sources of androgens exogenous to the prostate versus 'intracrine' sources within the prostatic tumor. Moreover, increased expression of androgen-metabolizing genes within castration-resistant metastases suggests that up-regulated activity of endogenous steroidogenic pathways may contribute to the outgrowth of 'castration-adapted' tumors. These observations suggest that a multi-targeted treatment approach designed to simultaneously ablate testicular, adrenal and intracrine contributions to the tumor androgen signaling axis will be required to achieve optimal therapeutic efficacy.
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Pletnev VZ, Thomas JL, Rhaney FL, Holt LS, Scaccia LA, Umland TC, Duax WL. Rational proteomics V: structure-based mutagenesis has revealed key residues responsible for substrate recognition and catalysis by the dehydrogenase and isomerase activities in human 3beta-hydroxysteroid dehydrogenase/isomerase type 1. J Steroid Biochem Mol Biol 2006; 101:50-60. [PMID: 16889958 PMCID: PMC1971842 DOI: 10.1016/j.jsbmb.2006.06.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Mammalian 3beta-hydroxysteroid dehydrogenase/isomerase (3beta-HSD) is a member of the short chain dehydrogenase/reductase. It is a key steroidogenic enzyme that catalyzes the first step of the multienzyme pathway conversion of circulating dehydroepiandrosterone and pregnenolone to active steroid hormones. A three dimensional model of a ternary complex of human 3beta-HSD type 1 (3beta-HSD_1) with an NAD cofactor and androstenedione product has been developed based upon X-ray structures of the ternary complex of E. coli UDP-galactose 4-epimerase (UDPGE) with an NAD cofactor and substrate (PDB_AC: 1NAH) and the ternary complex of human type 1 17beta-hydroxysteroid dehydrogenase (17beta-HSD_1) with an NADP cofactor and androstenedione (PDB_AC: 1QYX). The dimeric structure of the enzyme was built from two monomer models of 3beta-HSD_1 by respective 3D superposition with A and B subunits of the dimeric structure of Streptococcus suis DTDP-D-glucose 4,6-dehydratase (PDB_AC: 1KEP). The 3D model structure of 3beta-HSD_1 has been successfully used for the rational design of mutagenic experiments to further elucidate the key substrate binding residues in the active site as well as the basis for dual function of the 3beta-HSD_1 enzyme. The structure based mutant enzymes, Asn100Ser, Asn100Ala, Glu126Leu, His232Ala, Ser322Ala and Asn323Leu, have been constructed and functionally characterized. The mutagenic experiments have confirmed the predicted roles of the His232 and Asn323 residues in recognition of the 17-keto group of the substrate and identified Asn100 and Glu126 residues as key residues that participate for the dehydrogenase and isomerization reactions, respectively.
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Affiliation(s)
- Vladimir Z. Pletnev
- Hauptman-Woodward Medical Research Institute & Dept. of Structural Biology, SUNY at Buffalo, 700 Ellicott St., Buffalo, NY 14203, USA
- Institute of Bioorganic Chemistry RAS, Ul. Miklukho-Maklaya, 16/10, 117997 Moscow, Russia
| | - James L. Thomas
- Division of Basic Medical Sciences, Mercer University School of Medicine, Macon, GA
- Department of Ob-Gyn, Mercer University School of Medicine, Macon, GA
| | - Felicia L. Rhaney
- Department of Ob-Gyn, Mercer University School of Medicine, Macon, GA
| | - Lynley S. Holt
- Division of Basic Medical Sciences, Mercer University School of Medicine, Macon, GA
| | - Launa A. Scaccia
- Division of Basic Medical Sciences, Mercer University School of Medicine, Macon, GA
| | - Timothy C. Umland
- Hauptman-Woodward Medical Research Institute & Dept. of Structural Biology, SUNY at Buffalo, 700 Ellicott St., Buffalo, NY 14203, USA
| | - William L. Duax
- Hauptman-Woodward Medical Research Institute & Dept. of Structural Biology, SUNY at Buffalo, 700 Ellicott St., Buffalo, NY 14203, USA
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An S, Cho KH, Lee WS, Lee JO, Paik YK, Jeong TS. A critical role for the histidine residues in the catalytic function of acyl-CoA:cholesterol acyltransferase catalysis: evidence for catalytic difference between ACAT1 and ACAT2. FEBS Lett 2006; 580:2741-9. [PMID: 16647063 DOI: 10.1016/j.febslet.2006.04.035] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2006] [Revised: 04/04/2006] [Accepted: 04/05/2006] [Indexed: 10/24/2022]
Abstract
To investigate a role for histidine residues in the expression of normal acyl-CoA:cholesterol acyltransferase (ACAT) activity, the histidine residues located at five different positions in two isoenzymes were substituted by alanine, based on the sequence homology between ACAT1 and ACAT2. Among the 10 mutants generated by baculovirus expression technology, H386A-ACAT1, H460A-ACAT1, H360A-ACAT2, and H399A-ACAT2 lost their enzymatic activity completely. A reduction in catalytic activity is unlikely to result from structural changes in the substrate-binding pocket, because their substrate-binding affinities were normal. However, the enzymatic activity of H386A-ACAT1 was restored to <37% of the level of the wild-type activity when cholesterol was replaced by 25-hydroxycholesterol as substrate. H527A-ACAT1 and H501A-ACAT2, termed carboxyl end mutants, exhibit activities of approximately 96% and approximately 75% of that of the wild-type. Interestingly, H425A-ACAT1 showed 59% of the wild-type activity, in contrast to its equivalent mutant, H399A-ACAT2. These results demonstrate that the histidine residues located at the active site are very crucial both for the catalytic activity of the enzyme and for distinguishing ACAT1 from ACAT2 with respect to enzyme catalysis and substrate specificity.
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Affiliation(s)
- Sojin An
- National Research Laboratory of Lipid Metabolism and Atherosclerosis, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-333, Republic of Korea
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Duax WL, Thomas J, Pletnev V, Addlagatta A, Huether R, Habegger L, Weeks CM. Determining structure and function of steroid dehydrogenase enzymes by sequence analysis, homology modeling, and rational mutational analysis. Ann N Y Acad Sci 2005; 1061:135-48. [PMID: 16467263 PMCID: PMC1635414 DOI: 10.1196/annals.1336.015] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The short-chain oxidoreductase (SCOR) family of enzymes includes over 6,000 members identified in sequenced genomes. Of these enzymes, approximately 300 have been characterized functionally, and the three-dimensional crystal structures of approximately 40 have been reported. Since some SCOR enzymes are steroid dehydrogenases involved in hypertension, diabetes, breast cancer, and polycystic kidney disease, it is important to characterize the other members of the family for which the biological functions are currently unknown and to determine their three-dimensional structure and mechanism of action. Although the SCOR family appears to have only a single fully conserved residue, it was possible, using bioinformatics methods, to determine characteristic fingerprints composed of 30-40 residues that are conserved at the 70% or greater level in SCOR subgroups. These fingerprints permit reliable prediction of several important structure-function features including cofactor preference, catalytic residues, and substrate specificity. Human type 1 3beta-hydroxysteroid dehydrogenase isomerase (3beta-HSDI) has 30% sequence identity with a human UDP galactose 4-epimerase (UDPGE), a SCOR family enzyme for which an X-ray structure has been reported. Both UDPGE and 3-HSDI appear to trace their origins back to bacterial 3alpha,20beta-HSD. Combining three-dimensional structural information and sequence data on the 3alpha,20beta-HSD, UDPGE, and 3beta-HSDI subfamilies with mutational analysis, we were able to identify the residues critical to the dehydrogenase function of 3-HSDI. We also identified the residues most probably responsible for the isomerase activity of 3beta-HSDI. We test our predictions by specific mutations based on sequence analysis and our structure-based model.
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Affiliation(s)
- William L Duax
- Hauptman-Woodward Medical Research Institute Buffalo, NY 14203, USA.
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