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Parisien-La Salle S, Corbeil G, El-Haffaf Z, Duranceau C, Latour M, Karakiewicz PI, Lacroix A, Bourdeau I. Genetic Dissection of Primary Aldosteronism in a Patient With MEN1 and Ipsilateral Adrenocortical Carcinoma and Adenoma. J Clin Endocrinol Metab 2022; 108:26-32. [PMID: 36179244 DOI: 10.1210/clinem/dgac564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 09/23/2022] [Indexed: 02/03/2023]
Abstract
BACKGROUND Adrenal tumors are found in up to 40% of patients with multiple endocrine neoplasia type 1 (MEN1). However, adrenocortical carcinomas (ACC) and primary aldosteronism (PA) are rare in MEN1. CASE A 48-year-old woman known to have primary hyperparathyroidism and hypertension with hypokalemia was referred for a right complex 8-cm adrenal mass with a 38.1 SUVmax uptake on 18F-FDG PET/CT. PA was confirmed by saline suppression test (aldosterone 1948 pmol/L-1675 pmol/L; normal range [N]: <165 post saline infusion) and suppressed renin levels (<5 ng/L; N: 5-20). Catecholamines, androgens, 24-hour urinary cortisol, and pituitary panel were normal. A right open adrenalectomy revealed a concomitant 4-cm oncocytic ACC and a 2.3-cm adrenocortical adenoma. Immunohistochemistry showed high expression of aldosterone synthase protein in the adenoma but not in the ACC, supporting excess aldosterone production by the adenoma. GENETIC ANALYSIS After genetic counseling, the patient underwent genetic analysis of leucocyte and tumoral DNA. Sequencing of MEN1 revealed a heterozygous germline pathogenic variant in MEN1 (c.1556delC, p.Pro519Leufs*40). The wild-type MEN1 allele was lost in the tumoral DNA of both the resected adenoma and carcinoma. Sequencing analysis of driver genes in PA revealed a somatic pathogenic variant in exon 2 of the KCNJ5 gene (c.451G>A, p.Gly151Arg) only in the aldosteronoma. CONCLUSION To our knowledge, we describe the first case of adrenal collision tumors in a patient carrying a germline pathogenic variant of the MEN1 gene associated with MEN1 loss of heterozygosity in both oncocytic ACC and adenoma and a somatic KCNJ5 pathogenic variant leading to aldosterone-producing adenoma. This case gives new insights on adrenal tumorigenesis in MEN1 patients.
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Affiliation(s)
- Stéfanie Parisien-La Salle
- Division of Endocrinology, Department of Medicine, Research Center, Centre hospitalier de l'Université de Montréal (CHUM), Montreal, QC, H2X 0C1, Canada
| | - Gilles Corbeil
- Division of Endocrinology, Department of Medicine, Research Center, Centre hospitalier de l'Université de Montréal (CHUM), Montreal, QC, H2X 0C1, Canada
| | - Zaki El-Haffaf
- Division of Genetics, Department of Medicine, Research Center, Centre hospitalier de l'Université de Montréal (CHUM), Montreal, QC, H2X 0C1, Canada
| | - Caroline Duranceau
- Division of Endocrinology, Department of Medicine, Chicoutimi Hospital, Université du Québec à Chicoutimi, Chicoutimi, QC, H2X 0C1, Canada
| | - Mathieu Latour
- Department of Pathology and Cellular Biology, Centre hospitalier de l'Université de Montréal (CHUM), Montreal, QC, H2X 0C1, Canada
| | - Pierre I Karakiewicz
- Division of Urology, Department of Surgery, Centre Hospitalier de l'Université de Montréal, Montréal, QC, H2X 0C1, Canada
| | - André Lacroix
- Division of Endocrinology, Department of Medicine, Research Center, Centre hospitalier de l'Université de Montréal (CHUM), Montreal, QC, H2X 0C1, Canada
| | - Isabelle Bourdeau
- Division of Endocrinology, Department of Medicine, Research Center, Centre hospitalier de l'Université de Montréal (CHUM), Montreal, QC, H2X 0C1, Canada
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Pitsava G, Faucz FR, Stratakis CA, Hannah-Shmouni F. Update on the Genetics of Primary Aldosteronism and Aldosterone-Producing Adenomas. Curr Cardiol Rep 2022; 24:1189-1195. [PMID: 35841527 PMCID: PMC9667367 DOI: 10.1007/s11886-022-01735-z] [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] [Accepted: 06/07/2022] [Indexed: 11/03/2022]
Abstract
PURPOSE OF THE REVIEW Primary aldosteronism (PA) is the leading cause of secondary hypertension, accounting for over 10% of patients with high blood pressure. It is characterized by autonomous production of aldosterone from the adrenal glands leading to low-renin levels. The two most common forms arise from bilateral adrenocortical hyperplasia (BAH) and aldosterone-producing adenoma (APA). We discuss recent discoveries in the genetics of PA. RECENT FINDINGS Most APAs harbor variants in the KCNJ5, CACNA1D, ATP1A1, ATP2B3, and CTNNB1 genes. With the exception of β-catenin (CTNNB1), all other causative genes encode ion channels; pathogenic variants found in PA lead to altered ion transportation, cell membrane depolarization, and consequently aldosterone overproduction. Some of these genes are found mutated in the germline state (CYP11B2, CLCN2, KCNJ5, CACNA1H, and CACNA1D), leading then to familial hyperaldosteronism, and often BAH rather than single APAs. Several genetic defects in the germline or somatic state have been identified in PA. Understanding how these molecular abnormalities lead to excess aldosterone contributes significantly to the elucidation of the pathophysiology of low-renin hypertension. It may also lead to new and more effective therapies for this disease acting at the molecular level.
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Affiliation(s)
- Georgia Pitsava
- Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA
- Section On Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA
| | - Fabio R Faucz
- Section On Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA
| | - Constantine A Stratakis
- Section On Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA
- ELPEN Pharmaceuticals, Pikermi, Athens, Greece
- Human Genetics & Precision Medicine, IMBB, FORTH, Heraklion, Greece
| | - Fady Hannah-Shmouni
- Section On Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA.
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Nanba K, Rainey WE. GENETICS IN ENDOCRINOLOGY: Impact of race and sex on genetic causes of aldosterone-producing adenomas. Eur J Endocrinol 2021; 185:R1-R11. [PMID: 33900205 PMCID: PMC8480207 DOI: 10.1530/eje-21-0031] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 04/26/2021] [Indexed: 11/08/2022]
Abstract
Primary aldosteronism (PA) is a common cause of secondary hypertension. Recent technological advances in genetic analysis have provided a better understanding of the molecular pathogenesis of this disease. The application of next-generation sequencing has resulted in the identification of somatic mutations in aldosterone-producing adenoma (APA), a major subtype of PA. Based on the recent findings using a sequencing method that selectively targets the tumor region where aldosterone synthase (CYP11B2) is expressed, the vast majority of APAs appear to harbor a somatic mutation in one of the aldosterone-driver genes, including KCNJ5, ATP1A1, ATP2B3, CACNA1D, CACNA1H, and CLCN2. Mutations in these genes alter intracellular ion homeostasis and enhance aldosterone production. In a small subset of APAs, somatic activating mutations in the CTNNB1 gene, which encodes β-catenin, have also been detected. Accumulating evidence suggests that race and sex impact the somatic mutation spectrum of APA. Specifically, somatic mutations in the KCNJ5 gene, encoding an inwardly rectifying K+ channel, are common in APAs from Asian populations as well as women regardless of race. Associations between APA histology, genotype, and patient clinical characteristics have also been proposed, suggesting a potential need to consider race and sex for the management of PA patients. Herein, we review recent findings regarding somatic mutations in APA and discuss potential roles of race and sex on the pathophysiology of APA as well as possible clinical implications.
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Affiliation(s)
- Kazutaka Nanba
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, 48109
- Department of Endocrinology and Metabolism, National Hospital Organization Kyoto Medical Center, Kyoto, 612-8555, Japan
| | - William E. Rainey
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, 48109
- Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, 48109
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Puar TH, Loh WJ, Lim DS, Loh LM, Zhang M, Foo RS, Lee L, Swee DS, Khoo J, Tay D, Kam JW, Dekkers T, Velema M, Deinum J, Kek PC. Aldosterone-potassium ratio predicts primary aldosteronism subtype. J Hypertens 2021; 38:1375-1383. [PMID: 31851033 DOI: 10.1097/hjh.0000000000002348] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE Prediction models have been developed to predict either unilateral or bilateral primary aldosteronism, and these have not been validated externally. We aimed to develop a simplified score to predict both subtypes and validate this externally. METHODS Our development cohort was taken from 165 patients who underwent adrenal vein sampling (AVS) in two Asian tertiary centres. Unilateral disease was determined using both AVS and postoperative outcome. Multivariable analysis was used to construct prediction models. We validated our tool in a European cohort of 97 patients enrolled in the SPARTACUS trial who underwent AVS. Previously published prediction models were also tested in our cohorts. RESULTS Backward stepwise logistic regression analysis yielded a final tool using baseline aldosterone-to-lowest-potassium ratio (APR, ng/dl/mmol/l), with an area under receiver-operating characteristic curve of 0.80 (95% CI 0.70-0.89). In the Asian development cohort, probability of bilateral disease was 90.0% (with APR <5) and probability of unilateral disease was 91.4% (with APR >15). Similar results were seen in the European validation cohort. Combining both cohorts, probability of bilateral disease was 76.7% (with APR <5), and probability for unilateral was 91.7% (with APR >15). Other models had similar predictive ability but required more variables, and were less sensitive for identifying bilateral PA. CONCLUSION The novel aldosterone-to-lowest-potassium ratio is a convenient score to guide clinicians and patients of various ethnicities on the probability of primary aldosteronism subtype. Using APR to identify patients more likely to benefit from AVS may be a cost-effective strategy to manage this common condition.
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Affiliation(s)
- Troy H Puar
- Department of Endocrinology, Changi General Hospital
| | - Wann J Loh
- Department of Endocrinology, Changi General Hospital
| | - Dawn St Lim
- Department of Endocrinology, Singapore General Hospital, SingHealth
| | - Lih M Loh
- Department of Endocrinology, Singapore General Hospital, SingHealth
| | - Meifen Zhang
- Department of Endocrinology, Changi General Hospital
| | - Roger S Foo
- Cardiovascular Research Institute, Centre for Translational Medicine, MD6, National University Health System.,Genome Institute of Singapore
| | - Lynette Lee
- Department of Endocrinology, Changi General Hospital.,Department of Endocrinology, Singapore General Hospital, SingHealth
| | - Du S Swee
- Department of Endocrinology, Singapore General Hospital, SingHealth
| | - Joan Khoo
- Department of Endocrinology, Changi General Hospital
| | - Donovan Tay
- Department of Endocrinology, Sengkang General Hospital
| | - Jia W Kam
- Department of Clinical Trial Research Unit, Changi General Hospital, SingHealth, Singapore
| | - Tanja Dekkers
- Department of Internal Medicine, Division of Vascular Medicine
| | - Marieke Velema
- Department of Internal Medicine, Division of Endocrinology, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Jaap Deinum
- Department of Internal Medicine, Division of Vascular Medicine
| | - Peng C Kek
- Department of Endocrinology, Singapore General Hospital, SingHealth
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Update on Genetics of Primary Aldosteronism. Biomedicines 2021; 9:biomedicines9040409. [PMID: 33920271 PMCID: PMC8069207 DOI: 10.3390/biomedicines9040409] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 04/06/2021] [Accepted: 04/07/2021] [Indexed: 12/13/2022] Open
Abstract
Primary aldosteronism (PA) is the most common form of secondary hypertension, with a prevalence of 5–10% among patients with hypertension. PA is mainly classified into two subtypes: aldosterone-producing adenoma (APA) and bilateral idiopathic hyperaldosteronism. Recent developments in genetic analysis have facilitated the discovery of mutations in KCNJ5, ATP1A1, ATP2B3, CACNA1D, CACNA1H, CLCN2, and CTNNB1 in sporadic or familial forms of PA in the last decade. These findings have greatly advanced our understanding of the mechanism of excess aldosterone synthesis, particularly in APA. Most of the causative genes encode ion channels or pumps, and their mutations lead to depolarization of the cell membrane due to impairment of ion transport. Depolarization activates voltage-gated Ca2+ channels and intracellular calcium signaling and promotes the transcription of aldosterone synthase, resulting in overproduction of aldosterone. In this article, we review recent findings on the genetic and molecular mechanisms of PA.
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Tezuka Y, Yamazaki Y, Nakamura Y, Sasano H, Satoh F. Recent Development toward the Next Clinical Practice of Primary Aldosteronism: A Literature Review. Biomedicines 2021; 9:biomedicines9030310. [PMID: 33802814 PMCID: PMC8002562 DOI: 10.3390/biomedicines9030310] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 03/08/2021] [Accepted: 03/15/2021] [Indexed: 11/24/2022] Open
Abstract
For the last seven decades, primary aldosteronism (PA) has been gradually recognized as a leading cause of secondary hypertension harboring increased risks of cardiovascular incidents compared to essential hypertension. Clinically, PA consists of two major subtypes, surgically curable and uncurable phenotypes, determined as unilateral or bilateral PA by adrenal venous sampling. In order to further optimize the treatment, surgery or medications, diagnostic procedures from screening to subtype differentiation is indispensable, while in the general clinical practice, the work-up rate is extremely low even in the patients with refractory hypertension because of the time-consuming and labor-intensive nature of the procedures. Therefore, a novel tool to simplify the diagnostic flow has been recently in enormous demand. In this review, we focus on recent progress in the following clinically important topics of PA: prevalence of PA and its subtypes, newly revealed histopathological classification of aldosterone-producing lesions, novel diagnostic biomarkers and prediction scores. More effective strategy to diagnose PA based on better understanding of its epidemiology and pathology should lead to early detection of PA and could decrease the cardiovascular and renal complications of the patients.
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Affiliation(s)
- Yuta Tezuka
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan;
| | - Yuto Yamazaki
- Department of Pathology, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan; (Y.Y.); (H.S.)
| | - Yasuhiro Nakamura
- Division of Pathology, Faculty of Medicine, Tohoku Medical and Pharmaceutical University, Sendai 981-8558, Japan;
| | - Hironobu Sasano
- Department of Pathology, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan; (Y.Y.); (H.S.)
| | - Fumitoshi Satoh
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan;
- Division of Clinical Hypertension, Endocrinology and Metabolism, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan
- Correspondence:
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Nanba K, Yamazaki Y, Bick N, Onodera K, Tezuka Y, Omata K, Ono Y, Blinder AR, Tomlins SA, Rainey WE, Satoh F, Sasano H. Prevalence of Somatic Mutations in Aldosterone-Producing Adenomas in Japanese Patients. J Clin Endocrinol Metab 2020; 105:5897223. [PMID: 32844168 PMCID: PMC7947976 DOI: 10.1210/clinem/dgaa595] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 08/24/2020] [Indexed: 11/19/2022]
Abstract
CONTEXT Results of previous studies demonstrated clear racial differences in the prevalence of somatic mutations among patients with aldosterone-producing adenoma (APA). For instance, those in East Asian countries have a high prevalence of somatic mutations in KCNJ5, whereas somatic mutations in other aldosterone-driving genes are rare. OBJECTIVES To determine somatic mutation prevalence in Japanese APA patients using an aldosterone synthase (CYP11B2) immunohistochemistry (IHC)-guided sequencing approach. METHOD Patients with a unilateral form of primary aldosteronism who underwent adrenalectomy at the Tohoku University Hospital were studied. Based on CYP11B2 immunolocalization of resected adrenals, genomic DNA was isolated from the relevant positive area of 10% formalin-fixed, paraffin-embedded tissue of the APAs. Somatic mutations in aldosterone-driving genes were studied in APAs by direct Sanger sequencing and targeted next-generation sequencing. RESULTS CYP11B2 IHC-guided sequencing determined APA-related somatic mutations in 102 out of 106 APAs (96%). Somatic KCNJ5 mutation was the most frequent genetic alteration (73%) in this cohort of Japanese patients. Somatic mutations in other aldosterone-driving genes were also identified: CACNA1D (14%), ATP1A1 (5%), ATP2B3 (4%), and CACNA1H (1%), including 2 previously unreported mutations. KCNJ5 mutations were more often detected in APAs from female patients compared with those from male patients [95% (36/38) vs 60% (41/68); P < 0.0001]. CONCLUSION IHC-guided sequencing defined somatic mutations in over 95% of Japanese APAs. While the dominance of KCNJ5 mutations in this particular cohort was confirmed, a significantly higher KCNJ5 prevalence was detected in female patients. This study provides a better understanding of genetic spectrum of Japanese APA patients.
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Affiliation(s)
- Kazutaka Nanba
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan
- Department of Endocrinology and Metabolism, National Hospital Organization Kyoto Medical Center, Kyoto, Japan
| | - Yuto Yamazaki
- Department of Pathology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Nolan Bick
- Department of Pathology, University of Michigan, Ann Arbor, Michigan
| | - Kei Onodera
- Department of Pathology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Yuta Tezuka
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
- Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan
- Division of Clinical Hypertension, Endocrinology and Metabolism, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Kei Omata
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
- Division of Clinical Hypertension, Endocrinology and Metabolism, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Yoshikiyo Ono
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
- Division of Clinical Hypertension, Endocrinology and Metabolism, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Amy R Blinder
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan
| | - Scott A Tomlins
- Department of Pathology, University of Michigan, Ann Arbor, Michigan
- Rogel Cancer Center, University of Michigan, Ann Arbor, Michigan
- Michigan Center for Translational Pathology, University of Michigan, Ann Arbor, Michigan
- Department of Urology, University of Michigan, Ann Arbor, Michigan
| | - William E Rainey
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan
- Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan
| | - Fumitoshi Satoh
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
- Division of Clinical Hypertension, Endocrinology and Metabolism, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Hironobu Sasano
- Department of Pathology, Tohoku University Graduate School of Medicine, Sendai, Japan
- Correspondence and Reprint Requests: Hironobu Sasano, MD, PhD, Department of Pathology, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan. E-mail:
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Guo Z, Nanba K, Udager A, McWhinney BC, Ungerer JPJ, Wolley M, Thuzar M, Gordon RD, Rainey WE, Stowasser M. Biochemical, Histopathological, and Genetic Characterization of Posture-Responsive and Unresponsive APAs. J Clin Endocrinol Metab 2020; 105:5855173. [PMID: 32516371 PMCID: PMC7426003 DOI: 10.1210/clinem/dgaa367] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 06/05/2020] [Indexed: 01/27/2023]
Abstract
CONTEXT AND OBJECTIVE Posture-responsive and posture-unresponsive aldosterone-producing adenomas (APAs) account for approximately 40% and 60% of APAs, respectively. Somatic gene mutations have been recently reported to exist in approximately 90% of APAs. This study was designed to characterize the biochemical, histopathologic, and genetic properties of these 2 types of APA. METHODS Plasma levels of aldosterone and hybrid steroids (18-oxocortisol and 18-hydroxycortisol) were measured by liquid chromatography-tandem mass spectrometry. Immunohistochemistry for CYP11B2 (aldosterone synthase) and CYP17A1 (17α-hydroxylase) and deoxyribonucleic acid sequencing (Sanger and next-generation sequencing) were performed on APA tissue collected from 23 posture-unresponsive and 17 posture-responsive APA patients. RESULTS Patients with posture-unresponsive APA displayed higher (P < 0.01) levels of hybrid steroids, recumbent aldosterone and cortisol, larger (P < 0.01) zona fasciculata (ZF)-like tumors with higher (P < 0.01) expression of CYP17A1 (but not of CYP11B2) than patients with posture-responsive APA (most of which were not ZF-like). Of 40 studied APAs, 37 (92.5%) were found to harbor aldosterone-driving somatic mutations (KCNJ5 = 14 [35.0%], CACNA1D = 13 [32.5%], ATP1A1 = 8 [20.0%], and ATP2B3 = 2 [5.0%]), including 5 previously unreported mutations (3 in CACNA1D and 2 in ATP1A1). Notably, 64.7% (11/17) of posture-responsive APAs carried CACNA1D mutations, whereas 56.5% (13/23) of posture-unresponsive APAs harbored KCNJ5 mutations. CONCLUSIONS The elevated production of hybrid steroids by posture-unresponsive APAs may relate to their ZF-like tumor cell composition, resulting in expression of CYP17A1 (in addition to somatic gene mutation-driven CYP11B2 expression), thereby allowing production of cortisol, which acts as the substrate for CYP11B2-generated hybrid steroids.
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Affiliation(s)
- Zeng Guo
- Endocrine Hypertension Research Centre, University of Queensland Diamantina Institute, Greenslopes and Princess Alexandra Hospitals, Brisbane, Australia
| | - Kazutaka Nanba
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, US
- Department of Endocrinology and Metabolism, National Hospital Organization Kyoto Medical Center, Kyoto, Japan
| | - Aaron Udager
- Department of Pathology, University of Michigan Medical School, Ann Arbor, MI, US
- Michigan Center for Translational Pathology, Ann Arbor, MI, US
- Rogel Cancer Center, University of Michigan, Ann Arbor, MI, US
| | - Brett C McWhinney
- Department of Chemical Pathology, Pathology Queensland, Queensland Health, Brisbane, Australia
| | - Jacobus P J Ungerer
- Department of Chemical Pathology, Pathology Queensland, Queensland Health, Brisbane, Australia
- School of Biomedical Sciences, University of Queensland, Brisbane, Australia
| | - Martin Wolley
- Endocrine Hypertension Research Centre, University of Queensland Diamantina Institute, Greenslopes and Princess Alexandra Hospitals, Brisbane, Australia
| | - Moe Thuzar
- Endocrine Hypertension Research Centre, University of Queensland Diamantina Institute, Greenslopes and Princess Alexandra Hospitals, Brisbane, Australia
- Department of Endocrinology, Princess Alexandra Hospital, Brisbane, Australia
| | - Richard D Gordon
- Endocrine Hypertension Research Centre, University of Queensland Diamantina Institute, Greenslopes and Princess Alexandra Hospitals, Brisbane, Australia
| | - William E Rainey
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, US
- Division of Metabolism, Endocrine, and Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, US
| | - Michael Stowasser
- Endocrine Hypertension Research Centre, University of Queensland Diamantina Institute, Greenslopes and Princess Alexandra Hospitals, Brisbane, Australia
- Correspondence and Reprint Requests: Professor Michael Stowasser (MBBS, FRACP, PhD), Hypertension Unit, Princess Alexandra Hospital, 199 Ipswich Road, Woolloongabba, Brisbane, Queensland, 4102, Australia. E-mail:
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Rege J, Turcu AF, Rainey WE. Primary aldosteronism diagnostics: KCNJ5 mutations and hybrid steroid synthesis in aldosterone-producing adenomas. Gland Surg 2020; 9:3-13. [PMID: 32206594 DOI: 10.21037/gs.2019.10.22] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Primary aldosteronism (PA) is characterized by autonomous aldosterone production by renin-independent mechanisms and is most commonly sporadic. While 60-70% of sporadic PA can be attributed to bilateral hyperaldosteronism, the remaining 30-40% is caused by a unilateral aldosterone-producing adenoma (APA). Somatic mutations in or near the selectivity filter the KCNJ5 gene (encoding the potassium channel GIRK4) have been implicated in the pathogenesis of both sporadic and familial PA. Several studies using tumor tissue, peripheral and adrenal vein samples from PA patients have demonstrated that along with aldosterone, the hybrid steroids 18-hydroxycortisol (18OHF) and 18-oxocortisol (18oxoF) are a hallmark of APA harboring KCNJ5 mutations. Herein, we review the recent advances with respect to the molecular mechanisms underlying the pathogenesis of PA and the steroidogenic fingerprints of KCNJ5 mutations. In addition, we present an outlook toward the future of PA subtyping and diagnostic work-up utilizing steroid profiling.
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Affiliation(s)
- Juilee Rege
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Adina F Turcu
- Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - William E Rainey
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, USA.,Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
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Mohideen SK, Mustangin M, Kamaruddin NA, Muhammad R, Jamal ARA, Sukor N, Tan GC, Azizan EA. Prevalence and Histopathological Characteristics of KCNJ5 Mutant Aldosterone-Producing Adenomas in a Multi-Ethnic Malaysian Cohort. Front Endocrinol (Lausanne) 2019; 10:666. [PMID: 31636604 PMCID: PMC6787170 DOI: 10.3389/fendo.2019.00666] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Accepted: 09/13/2019] [Indexed: 11/16/2022] Open
Abstract
Studies on excised adrenals from primary aldosteronism patients have found that somatic mutations in KCNJ5 frequently cause excess aldosterone production in the culprit aldosterone-producing adenoma (APA). KCNJ5 mutant APAs were reported to be peculiarly overrepresented among young females and in Oriental cohorts, compared to their older male, or Caucasian counterparts. These larger APAs were also reported to have similarities with the zona fasciculata (ZF) in the adrenal both from the steroid production profile and the morphology of the cell. We therefore aimed to corroborate these findings by characterizing the APAs from a multi-ethnic Malaysian cohort. The prevalence of KCNJ5 mutations was estimated through targeted DNA sequencing of KCNJ5 in 54 APAs. Confirmation of APA sample acquisition was performed by CYP11B2 immunohistochemistry (IHC) staining. The ZF steroid production profile was based on the ZF enzyme CYP17A1 IHC staining, and ZF cell morphology was based on a high cytoplasm to nucleus ratio. Seventeen (31.5%) APAs studied, harbored a KCNJ5 mutation. No female over-representation was seen in this cohort though females were found to have a higher expression of CYP11B2 than males (p = 0.009; Mann-Whitney U test). Age at adrenalectomy correlated negatively with the percentage of ZF-like cells in the APA (p = 0.01; Spearman's rho) but not with the KCNJ5 genotype. KCNJ5 mutant APAs had a high percentage of ZF-like cells (and high CYP17A1 expression) but so did the wild-type APAs. In summary, prevalence of KCNJ5 mutant APAs in this cohort was similar to other Caucasian cohorts, however, over-representation of females did not occur, which is similar to some studies in Oriental cohorts.
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Affiliation(s)
- Syahirah Kaja Mohideen
- Department of Medicine, The National University of Malaysia (UKM) Medical Centre, Kuala Lumpur, Malaysia
| | | | - Nor Azmi Kamaruddin
- Department of Medicine, The National University of Malaysia (UKM) Medical Centre, Kuala Lumpur, Malaysia
| | | | - A. Rahman A. Jamal
- UKM Medical Molecular Biology Institute, UKM Medical Centre, Kuala Lumpur, Malaysia
| | - Norlela Sukor
- Department of Medicine, The National University of Malaysia (UKM) Medical Centre, Kuala Lumpur, Malaysia
| | - Geok Chin Tan
- Department of Pathology, UKM Medical Centre, Kuala Lumpur, Malaysia
| | - Elena Aisha Azizan
- Department of Medicine, The National University of Malaysia (UKM) Medical Centre, Kuala Lumpur, Malaysia
- *Correspondence: Elena Aisha Azizan
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