1
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Vervloet MG. Can we reverse arterial stiffness by intervening on CKD-MBD biomarkers? Clin Kidney J 2023; 16:1766-1775. [PMID: 37915898 PMCID: PMC10616505 DOI: 10.1093/ckj/sfad112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Indexed: 11/03/2023] Open
Abstract
The increased cardiovascular risk of chronic kidney disease may in part be the consequence of arterial stiffness, a typical feature of kidney failure. Deranged homeostasis of minerals and hormones involved (CKD-MBD), are also strongly associated with this increased risk. It is well established that CKD-MBD is a main driver of vascular calcification, which in turn worsens arterial stiffness. However, there are other contributors to arterial stiffness in CKD than calcification. An overlooked possibility is that CKD-MBD may have detrimental effects on this potentially better modifiable component of arterial stiffness. In this review, the individual contributions of short-term changes in calcium, phosphate, PTH, vitamin D, magnesium, and FGF23 to arterial stiffness, in most studies assessed as pulse wave velocity, is summarized. Indeed, there is evidence from both observational studies and interventional trials that higher calcium concentrations can worsen arterial stiffness. This, however, has not been shown for phosphate, and it seems unlikely that, apart from being a contributor to vascular calcification and having effects on the microcirculation, phosphate has no acute effect on large artery stiffness. Several interventional studies, both by infusing PTH and by abrupt lowering PTH by calcimimetics or surgery, virtually ruled out direct effects on large artery stiffness. A well-designed trial using both active and nutritional vitamin D as intervention found a beneficial effect for the latter. Unfortunately, the study had a baseline imbalance and other studies did not support its finding. Both magnesium and FGF23 do not seem do modify central arterial stiffness.
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Affiliation(s)
- Marc G Vervloet
- Amsterdam University Medical Centres, Nephrology, Amsterdam, The Netherlands
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2
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Jensen NS, Wehland M, Wise PM, Grimm D. Latest Knowledge on the Role of Vitamin D in Hypertension. Int J Mol Sci 2023; 24:ijms24054679. [PMID: 36902110 PMCID: PMC10003079 DOI: 10.3390/ijms24054679] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 02/24/2023] [Accepted: 02/26/2023] [Indexed: 03/06/2023] Open
Abstract
Hypertension is the third leading cause of the global disease burden, and while populations live longer, adopt more sedentary lifestyles, and become less economically concerned, the prevalence of hypertension is expected to increase. Pathologically elevated blood pressure (BP) is the strongest risk factor for cardiovascular disease (CVD) and related disability, thus making it imperative to treat this disease. Effective standard pharmacological treatments, i.e., diuretics, angiotensin converting enzyme (ACE) inhibitors, angiotensin receptor blocker (ARBs), beta-adrenergic receptor blockers (BARBs), and calcium channel blockers (CCBs), are available. Vitamin D (vitD) is known best for its role in bone and mineral homeostasis. Studies with vitamin D receptor (VDR) knockout mice show an increased renin-angiotensin-aldosterone system (RAAS) activity and increased hypertension, suggesting a key role for vitD as a potential antihypertensive agent. Similar studies in humans displayed ambiguous and mixed results. No direct antihypertensive effect was shown, nor a significant impact on the human RAAS. Interestingly, human studies supplementing vitD with other antihypertensive agents reported more promising results. VitD is considered a safe supplement, proposing its great potential as antihypertensive supplement. The aim of this review is to examine the current knowledge about vitD and its role in the treatment of hypertension.
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Affiliation(s)
- Niklas S. Jensen
- Department of Biomedicine, Aarhus University, Ole Worms Allé 4, 8000 Aarhus, Denmark
| | - Markus Wehland
- Department of Microgravity and Translational Regenerative Medicine, University Clinic for Plastic, Aesthetic and Hand Surgery, Otto von Guericke University, Universitätsplatz 2, 39106 Magdeburg, Germany
- Research Group “Magdeburger Arbeitsgemeinschaft für Forschung unter Raumfahrt- und Schwerelosigkeitsbedingungen” (MARS), Otto von Guericke University, 39106 Magdeburg, Germany
| | - Petra M. Wise
- The Saban Research Institute, Children’s Hospital Los Angeles, University of Southern California, 4650 Sunset Blvd, Los Angeles, CA 90027, USA
| | - Daniela Grimm
- Department of Biomedicine, Aarhus University, Ole Worms Allé 4, 8000 Aarhus, Denmark
- Department of Microgravity and Translational Regenerative Medicine, University Clinic for Plastic, Aesthetic and Hand Surgery, Otto von Guericke University, Universitätsplatz 2, 39106 Magdeburg, Germany
- Research Group “Magdeburger Arbeitsgemeinschaft für Forschung unter Raumfahrt- und Schwerelosigkeitsbedingungen” (MARS), Otto von Guericke University, 39106 Magdeburg, Germany
- Correspondence: ; Tel.: +45-21379702
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3
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Arterial Stiffness in Thyroid and Parathyroid Disease: A Review of Clinical Studies. J Clin Med 2022; 11:jcm11113146. [PMID: 35683533 PMCID: PMC9180991 DOI: 10.3390/jcm11113146] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 05/23/2022] [Accepted: 05/30/2022] [Indexed: 01/27/2023] Open
Abstract
Growing evidence shows that arterial stiffness measurement provides important prognostic information and improves clinical stratification of cardiovascular risk. Thyroid and parathyroid diseases are endocrine diseases with a relevant cardiovascular burden. The objective of this review was to consider the relationship between arterial stiffness and thyroid and parathyroid diseases in human clinical studies. We performed a systematic literature review of articles published in PubMed/MEDLINE from inception to December 2021, restricted to English languages and to human adults. We selected relevant articles about the relationship between arterial stiffness and thyroid and parathyroid diseases. For each selected article, data on arterial stiffness were extracted and factors that may have an impact on arterial stiffness were identified. We considered 24 papers concerning hypothyroidism, 9 hyperthyroidism and 16 primary hyperparathyroidism and hypoparathyroidism. Most studies evidenced an increase in arterial stiffness biomarkers in hypothyroidism, hyperthyroidism and primary hyperparathyroidism, even in subclinical and mild forms, although heterogeneity of measurement methods and of study designs prevented a definitive conclusion, suggesting that the assessment of arterial stiffness may be considered in the clinical evaluation of cardiovascular risk in these diseases.
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4
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Yap M, Chandler O, Savas S, Xu D. Unusual cause of resistant hypertension in a 33-year-old woman with a palpable parathyroid nodule. BMJ Case Rep 2021; 14:e244067. [PMID: 34380683 PMCID: PMC8359501 DOI: 10.1136/bcr-2021-244067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/23/2021] [Indexed: 11/04/2022] Open
Abstract
A 33-year-old woman presented for investigation for a secondary cause of her long-standing treatment-resistant hypertension. Physical examination revealed a palpable thyroid nodule with subsequent ultrasound and CT scan indicating the nodule was of parathyroid origin. A palpable parathyroid nodule is known to be highly suspicious for a parathyroid carcinoma, and it remains a differential until proven otherwise. Histopathology following surgical excision confirmed a parathyroid adenoma, and during subsequent follow-up visits with her general practitioner, her antihypertensive was successfully weaned. We report a case of a large palpable parathyroid adenoma being the secondary cause of treatment-resistant hypertension.
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Affiliation(s)
- Max Yap
- Curtin Medical School, Faculty of Health Sciences, Curtin University Bentley Campus, Perth, Western Australia, Australia
| | - Owain Chandler
- Curtin Medical School, Faculty of Health Sciences, Curtin University Bentley Campus, Perth, Western Australia, Australia
| | - Stanley Savas
- Belvidere Health Center (Curtin Medical School Associated GP Teaching Clinic), Arche Health Pty Ltd, Perth, Western Australia, Australia
| | - Dan Xu
- Curtin Medical School, Faculty of Health Sciences, Curtin University Bentley Campus, Perth, Western Australia, Australia
- Curtin School of Population Health, Faculty of Health Sciences, Curtin University Bentley Campus, Perth, Western Australia, Australia
- Medical Education and General Practice, First Affiliated Hospital, Sun Yan-Sen University, Guangzhou, Guangdong, China
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5
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Graff-Baker AN, Bridges LT, Chen Q, Faries MB, Said M. Parathyroidectomy for Patients With Primary Hyperparathyroidism and Associations With Hypertension. JAMA Surg 2021; 155:32-39. [PMID: 31596437 DOI: 10.1001/jamasurg.2019.3950] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Importance Hyperparathyroidism is associated with cardiovascular disease. However, evidence for a beneficial consequence of parathyroidectomy on hypertension is limited. Objective To investigate if parathyroidectomy improves hypertension in patients with primary hyperparathyroidism (PHPT). Design, Setting, and Participants In this cohort study and retrospective database review, patients with PHPT and hypertension between January 1, 2008, and December 31, 2016, were identified. The mean arterial pressure (MAP) and number of antihypertensive medications were compared between those who did and did not undergo parathyroidectomy. The setting was a large health care system. Primary hyperparathyroidism was defined using biochemical data, and hypertension was identified by International Classification of Diseases, Ninth Revision codes. Exposure Parathyroidectomy was identified in the database by Current Procedural Terminology codes. Main Outcomes and Measures The MAP and use of antihypertensive medications were compared for patients who underwent parathyroidectomy and those who did not at 6 months, 1 year, and 2 years. Multivariable logistic regression was used to assess the adjusted odds ratios for both increased and decreased use of antihypertensive medications. Results In this cohort study of 2380 participants (79.0% female), patients undergoing parathyroidectomy (n = 501) were younger (mean [SD] age, 65.3 [9.7] vs 71.9 [10.4] years; P < .001) and took fewer antihypertensive medications at baseline (mean [SD] number of medications, 1.2 [1.1] vs 1.5 [1.3], P < .001) than nonsurgical patients (n = 1879). Patients with parathyroidectomy showed greater improvement in their MAP at all follow-up time points (the median [SD] MAP change from baseline to 1 year was 0.1 [8.7] mm Hg without parathyroidectomy vs -1.2 [7.7] mm Hg after parathyroidectomy, P = .002). Nonsurgical patients were more likely vs those with parathyroidectomy to require more antihypertensive medications at 6 months (15.9% [n = 298] vs 9.8% [n = 49], P = .001), 1 year (18.1% [n = 340] vs 10.8% [n = 54], P < .001), and 2 years (17.6% [n = 330] vs 12.2% [n = 61], P = .004). By multivariable analysis, parathyroidectomy was independently associated with freedom from an increased number of antihypertensive medications at all periods (eg, adjusted odds ratio, 0.49; 95% CI, 0.34-0.70; P < .001 at 1 year). Among patients who were initially not taking antihypertensive medications, patients with parathyroidectomy were less likely vs no surgery to start antihypertensive medication treatment at all periods (eg, 10.2% [13 of 127] vs 30.4% [136 of 447], P < .001 at 1 year). Conclusions and Relevance This study's findings suggest that, among hypertensive patients with PHPT, parathyroidectomy may be associated not only with greater decreases in their MAP but also with reduced requirements for antihypertensive medications. Parathyroidectomy decreased the number of patients who began taking antihypertensive medications. Additional study will be required to find whether there are downstream cardiovascular benefits of parathyroidectomy. Preexisting hypertension, particularly in those not already taking antihypertensive medications, should be considered when weighing surgical treatment.
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Affiliation(s)
- Amanda N Graff-Baker
- John Wayne Cancer Institute, Santa Monica, California.,Department of Surgery, Kaiser Permanente San Jose Medical Center, San Jose, California
| | - Letitia T Bridges
- Department of Surgery, Kaiser Permanente Woodland Hills Medical Center, Woodland Hills, California
| | - Qiaoling Chen
- Department of Research & Evaluation, Kaiser Permanente Southern California, Pasadena
| | - Mark B Faries
- The Angeles Clinic and Research Institute, Los Angeles, California
| | - Meena Said
- John Wayne Cancer Institute, Santa Monica, California.,Department of Surgery, Kaiser Permanente Woodland Hills Medical Center, Woodland Hills, California
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6
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Oinonen L, Tikkakoski A, Koskela J, Eräranta A, Kähönen M, Niemelä O, Mustonen J, Pörsti I. Parathyroid hormone may play a role in the pathophysiology of primary hypertension. Endocr Connect 2021; 10:54-65. [PMID: 33289696 PMCID: PMC7923049 DOI: 10.1530/ec-20-0446] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 12/03/2020] [Indexed: 12/15/2022]
Abstract
Parathyroid hormone has been related with the risk of hypertension, but the matter remains controversial. We examined the association of parathyroid hormone with central blood pressure and its determinants in 622 normotensive or never-treated hypertensive subjects aged 19-72 years without diabetes, cardiovascular or renal disease, or cardiovascular medications. The methods were whole-body impedance cardiography and analyses of pulse wave and heart rate variability. Cardiovascular function was examined in sex-specific tertiles of plasma parathyroid hormone (mean concentrations 3.0, 4.3 and 6.5 pmol/L, respectively) during head-up tilt. Explanatory factors for haemodynamics were further investigated using linear regression analyses. Mean age was 45.0 (s.d. 11.7) years, BMI 26.8 (4.4) kg/m2, seated office blood pressure 141/90 (21/12) mmHg, and 309 subjects (49.7%) were male. Only five participants had elevated plasma parathyroid hormone and calcium concentrations. Highest tertile of parathyroid hormone presented with higher supine and upright aortic diastolic blood pressure (P < 0.01) and augmentation index (P < 0.01), and higher upright systemic vascular resistance (P < 0.05) than the lowest tertile. The tertiles did not present with differences in pulse wave velocity, cardiac output, or measures of heart rate variability. In linear regression analyses, parathyroid hormone was an independent explanatory factor for aortic systolic (P = 0.005) and diastolic (P = 0.002) blood pressure, augmentation index (P = 0.002), and systemic vascular resistance (P = 0.031). To conclude, parathyroid hormone was directly related to central blood pressure, wave reflection, and systemic vascular resistance in subjects without cardiovascular comorbidities and medications. Thus, parathyroid hormone may play a role in the pathophysiology of primary hypertension.
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Affiliation(s)
- Lasse Oinonen
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- Correspondence should be addressed to L Oinonen:
| | - Antti Tikkakoski
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- Department of Clinical Physiology, Tampere University Hospital, Tampere, Finland
| | - Jenni Koskela
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- Department of Internal Medicine, Tampere University Hospital, Tampere, Finland
| | - Arttu Eräranta
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
| | - Mika Kähönen
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- Department of Clinical Physiology, Tampere University Hospital, Tampere, Finland
| | - Onni Niemelä
- Department of Laboratory Medicine and Medical Research Unit, Seinäjoki Central Hospital, Seinäjoki, Finland
| | - Jukka Mustonen
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- Department of Internal Medicine, Tampere University Hospital, Tampere, Finland
| | - Ilkka Pörsti
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- Department of Internal Medicine, Tampere University Hospital, Tampere, Finland
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7
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Abstract
PURPOSE OF REVIEW To discuss selected endocrine causes of hypertension and to provide practical clinical recommendations regarding the evaluation and treatment of these disorders. RECENT FINDINGS More than 15 endocrine disorders with varying rates of prevalence can cause hypertension. For example, primary aldosteronism may exist in up to 20% of patients with resistant hypertension. Recognition of these important secondary causes of hypertension is essential to provide contemporary targeted therapies in order to improve long-term disease outcomes. Clinicians must have a broad understanding of the prevalence, clinical presentation, and current diagnostic modalities for endocrine causes of hypertension to facilitate prompt referral, identification, and optimal management of these disorders. Endocrine causes of hypertension are multifactorial and, in some cases, widely prevalent. It is important for clinicians considering secondary causes of hypertension to be knowledgeable about the underlying pathophysiology of these disorders and to understand when additional evaluation and treatment may be needed.
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8
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Sass MR, Wewer Albrechtsen NJ, Pedersen J, Hare KJ, Borbye-Lorenzen N, Kiss K, Vilsbøll T, Knop FK, Poulsen SS, Jørgensen NR, Holst JJ, Ørskov C, Hartmann B. Secretion of parathyroid hormone may be coupled to insulin secretion in humans. Endocr Connect 2020; 9:747-754. [PMID: 32698134 PMCID: PMC7424341 DOI: 10.1530/ec-20-0092] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Accepted: 07/01/2020] [Indexed: 12/12/2022]
Abstract
OBJECTIVE Parathyroid hormone (PTH) is a key hormone in regulation of calcium homeostasis and its secretion is regulated by calcium. Secretion of PTH is attenuated during intake of nutrients, but the underlying mechanism(s) are unknown. We hypothesized that insulin acts as an acute regulator of PTH secretion. METHODS Intact PTH was measured in plasma from patients with T1D and matched healthy individuals during 4-h oral glucose tolerance tests (OGTT) and isoglycemic i.v. glucose infusions on 2 separate days. In addition, expression of insulin receptors on surgical specimens of parathyroid glands was assessed by immunochemistry (IHC) and quantitative PCR (qPCR). RESULTS The inhibition of PTH secretion was more pronounced in healthy individuals compared to patients with T1D during an OGTT (decrementalAUC0-240min: -5256 ± 3954 min × ng/L and -2408 ± 1435 min × ng/L, P = 0.030). Insulin levels correlated significantly and inversely with PTH levels, also after adjusting for levels of several gut hormones and BMI (P = 0.002). Expression of insulin receptors in human parathyroid glands was detected by both IHC and qPCR. CONCLUSION Our study suggests that insulin may act as an acute regulator of PTH secretion in humans.
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Affiliation(s)
- Marie Reeberg Sass
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Nicolai Jacob Wewer Albrechtsen
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Department of Clinical Biochemistry, Rigshospitalet, Copenhagen, Denmark
| | - Jens Pedersen
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Department of Endocrinology and Nephrology, Nordsjællands University Hospital, Hillerød, Denmark
| | - Kristine Juul Hare
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Nis Borbye-Lorenzen
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Center for Neonatal Screening, Department of Congenital Disorders, Statens Serum Institute, Copenhagen, Denmark
| | - Katalin Kiss
- Department of Pathology, Rigshospitalet, Copenhagen, Denmark
| | - Tina Vilsbøll
- Steno Diabetes Center Copenhagen, Gentofte, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Center for Clinical Metabolic Research, Gentofte Hospital, University of Copenhagen, Hellerup, Denmark
| | - Filip Krag Knop
- Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Steno Diabetes Center Copenhagen, Gentofte, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Center for Clinical Metabolic Research, Gentofte Hospital, University of Copenhagen, Hellerup, Denmark
| | - Steen Seier Poulsen
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Niklas Rye Jørgensen
- Department of Clinical Biochemistry, Rigshospitalet, Copenhagen, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Jens Juul Holst
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Cathrine Ørskov
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Bolette Hartmann
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Correspondence should be addressed to B Hartmann:
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9
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Abstract
Although untreated primary hyperparathyroidism is associated with increased cardiovascular mortality, controversy exists regarding the therapeutic effects of parathyroidectomy on cardiovascular health. This review will examine the evidence linking primary hyperparathyroidism (PHPT) and cardiovascular disease, specifically hypertension, and evaluate the available literature regarding the natural history of hypertension after successful parathyroidectomy.
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Affiliation(s)
- Sarah B Fisher
- Department of Surgical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Nancy D Perrier
- Department of Surgical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
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10
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Oinonen L, Koskela J, Eräranta A, Tikkakoski A, Kähönen M, Niemelä O, Mustonen J, Pörsti I. Plasma total calcium concentration is associated with blood pressure and systemic vascular resistance in normotensive and never-treated hypertensive subjects. Blood Press 2019; 29:137-148. [PMID: 31790289 DOI: 10.1080/08037051.2019.1696180] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Purpose: The underlying causes of primary hypertension are not fully understood. Evidence on the relation of plasma calcium concentration with blood pressure (BP) is inconsistent and relies largely on studies utilizing office BP measurements in populations using cardiovascular drugs. In many studies adjustment for confounders was not optimal. In this cross-sectional study we examined the association of plasma total calcium concentration with the haemodynamic determinants of blood pressure.Subjects and methods: Supine haemodynamics were recorded using pulse wave analysis, whole-body impedance cardiography, and heart rate variability analysis in 618 normotensive or never-treated hypertensive subjects (aged 19-72 years) without diabetes, cardiovascular or renal disease, or cardiovascular medications. Linear regression analysis was used to investigate factors associated with haemodynamic variables.Results: Mean age was 45.0 years, body mass index 26.8 kg/m2, seated office BP 141/89 mmHg, and 307 subjects (49.7%) were male. Mean values of routine blood and plasma chemistry analyses were within the reference limits of the tests except for low-density lipoprotein cholesterol (3.05 mmol/l). In the laboratory, mean supine radial BP was 131/75 mmHg, and both systolic and diastolic BP correlated directly with plasma total calcium concentration (r = 0.25 and r = 0.22, respectively, p < 0.001 for both). In regression analysis plasma total calcium concentration was an independent explanatory variable for radial and aortic systolic and diastolic BP, and systemic vascular resistance, but not for cardiac output, pulse wave velocity, or any of the heart rate variability parameters.Conclusion: Plasma total calcium concentration was directly associated with systolic and diastolic BP and systemic vascular resistance in normotensive or never-treated hypertensive subjects without comorbidities and cardiovascular medications. Higher plasma calcium concentration potentially plays a role in primary hypertension via an effect on vascular resistance.
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Affiliation(s)
- Lasse Oinonen
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
| | - Jenni Koskela
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland.,Department of Internal Medicine, Tampere University Hospital, Tampere, Finland
| | - Arttu Eräranta
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
| | - Antti Tikkakoski
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland.,Department of Clinical Physiology, Tampere University Hospital, Tampere, Finland
| | - Mika Kähönen
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland.,Department of Clinical Physiology, Tampere University Hospital, Tampere, Finland
| | - Onni Niemelä
- Department of Laboratory Medicine and Medical Research Unit, Seinäjoki Central Hospital, Seinäjoki, Finland
| | - Jukka Mustonen
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland.,Department of Internal Medicine, Tampere University Hospital, Tampere, Finland
| | - Ilkka Pörsti
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland.,Department of Internal Medicine, Tampere University Hospital, Tampere, Finland
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11
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Pal R, Mukherjee S, Bhadada SK, Bhansali A, Puravoor J, Behera A. Persistence of "non-dipping" pattern in blood pressure after curative parathyroidectomy in apparently normotensive patients with symptomatic primary hyperparathyroidism. MINERVA ENDOCRINOL 2019; 45:181-188. [PMID: 31789012 DOI: 10.23736/s0391-1977.19.03104-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
BACKGROUND The prevalence of hypertension in primary hyperparathyroidism (PHPT) varies from 20-80% with data being based on office-based blood pressure measurements. Little is known about ambulatory monitoring of blood pressure (AMBP) in PHPT and changes in blood pressure (BP) variables post-curative parathyroidectomy. Hence, we conducted a prospective study wherein we performed AMBP in apparently normotensive patients with PHPT and reevaluated them 3 months post-curative parathyroidectomy. METHODS Consecutive patients with symptomatic PHPT aged 20 years and above underwent 24 hours AMBP at enrollment and at 3 months after successful parathyroidectomy. Pre- and postoperative BP variables were compared and correlated with serum calcium, creatinine and intact parathyroid hormone (iPTH) levels. RESULTS After exclusion, 17 symptomatic PHPT patients were enrolled in the study. AMBP detected hypertension in 4 (23.5%) patients. There was a significant reduction in the average nighttime systolic (P=0.007) and diastolic BP (P=0.034) after parathyroidectomy. However, the average 24 hours systolic/diastolic BP, daytime systolic/diastolic BP and average 24 hours mean arterial pressure did not differ before and after surgery. Non-dipping blood pressure pattern was seen in 53% of patients at presentation and persisted in 50% of cases after successful surgery. None of the biochemical parameters significantly correlated with any BP variable. CONCLUSIONS AMBP can help detect hypertension in patients with PHPT that remains unrecognized with routine office-based blood pressure measurement. In addition, AMBP detects loss of normal dipping pattern in BP that persists in almost half of the patients even after successful parathyroidectomy, perhaps because of permanent vascular damage induced by PHPT.
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Affiliation(s)
- Rimesh Pal
- Departments of Endocrinology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Soham Mukherjee
- Departments of Endocrinology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Sanjay K Bhadada
- Departments of Endocrinology, Postgraduate Institute of Medical Education and Research, Chandigarh, India -
| | - Anil Bhansali
- Departments of Endocrinology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Jayaprakash Puravoor
- Departments of Endocrinology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Arunanshu Behera
- Departments of General Surgery, Postgraduate Institute of Medical Education and Research, Chandigarh, India
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12
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13
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Vatakencherry RMJ, Saraswathy L. Association between vitamin D and hypertension in people coming for health check up to a tertiary care centre in South India. J Family Med Prim Care 2019; 8:2061-2067. [PMID: 31334180 PMCID: PMC6618207 DOI: 10.4103/jfmpc.jfmpc_236_19] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 03/20/2019] [Accepted: 04/09/2019] [Indexed: 12/13/2022] Open
Abstract
INTRODUCTION Vitamin D has many effects apart from its role in calcium metabolism and bone health. Vitamin D is derived from endogenous ultraviolet-B induced vitamin D synthesis in the skin, and the current high prevalence of vitamin D deficiency in India, can be attributed to lifestyle related low sunlight exposure. Identification of the vitamin D receptor (VDR) in almost all human cells, suggests a role in extra skeletal diseases. Studies have shown that vitamin D deficiency is an independent risk factor for hypertension. AIM To evaluate the association between vitamin D and hypertension in people coming for health check up to a tertiary care center in South India. MATERIALS AND METHODS Study was carried out as a cross sectional study in a tertiary care hospital in South India. Participants (520) were both males and females (337 males and 183 females), between the age group of 20-60 years attending the comprehensive health check up clinic of our hospital. STATISTICAL ANALYSIS Statistical analysis was done using IBM SPSS statistics 20.0. RESULTS Severe vitamin D deficiency was highly prevalent in people with hypertension than in people without hypertension (P value <0.001). CONCLUSION Since India is a tropical country, till recently it was believed that vitamin D deficiency and its ill effects are uncommon. But it was found that, vitamin D deficiency was highly prevalent in people with hypertension in South India, emphasizing the need of early vitamin D supplementation. Therefore, to reduce cardiovascular morbidity, early identification of vitamin D deficiency and appropriate vitamin D supplementation may be of primary importance in population, especially like ours, having high prevalence.
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Affiliation(s)
- Rose Mary J. Vatakencherry
- Department of Physiology, Amrita School of Medicine, Amrita Institute of Medical Sciences, Amrita Vishwa Vidyapeetham University, Kochi, Kerala
| | - L Saraswathy
- Department of Physiology, Amrita School of Medicine, Amrita Institute of Medical Sciences, Amrita Vishwa Vidyapeetham University, Kochi, Kerala
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Chiodini I, Cairoli E, Palmieri S, Pepe J, Walker MD. Non classical complications of primary hyperparathyroidism. Best Pract Res Clin Endocrinol Metab 2018; 32:805-820. [PMID: 30665548 DOI: 10.1016/j.beem.2018.06.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Several studies suggested that the condition of primary hyperparathyroidism (PHPT) may be associated not only with the classical bone, kidney and gastrointestinal consequences, but also with cardiovascular, neuromuscular and articular complications, impaired quality of life and increased cancer risk. However, the only cardiovascular complications associated with PHPT, which seems to improve after parathyroidectomy, is left ventricular hypertrophy, while, data regarding the reversibility of hypertension, valve calcifications and increased vascular stiffness are inconsistent. Parathyroidectomy seems to ameliorate neuropsychological, cognitive disturbances and quality of life in moderate-severe PHPT, while data in mild PHPT are less clear. At variance, the effect of parathyroidectomy on neuromuscular and articular complications is still unknown, and no studies demonstrated a reduction of cancer risk after recovery from PHPT. Overall, to date, cardiovascular and neuropsychological evaluation are not recommended solely because of PHPT, nor cardiovascular disease, muscle weakness, and neuropsychological complications are indication for parathyroidectomy.
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Affiliation(s)
- I Chiodini
- Unit for Bone Metabolism Diseases and Diabetes & Lab. of Endocrine and Metabolic Research, Istituto Auxologico Italiano, IRCCS, Milan, Italy; Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy.
| | - E Cairoli
- Unit for Bone Metabolism Diseases and Diabetes & Lab. of Endocrine and Metabolic Research, Istituto Auxologico Italiano, IRCCS, Milan, Italy; Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - S Palmieri
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy; Unit of Endocrinology, Fondazione IRCCS Cà Granda, Milan, Italy
| | - J Pepe
- Department of Internal Medicine and Medical Disciplines, "Sapienza" University, Rome, Italy
| | - M D Walker
- Department of Medicine, Division of Endocrinology, Columbia University College of Physicians and Surgeons, New York, NY, USA
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Verdoia M, Pergolini P, Rolla R, Nardin M, Barbieri L, Schaffer A, Bellomo G, Marino P, Suryapranata H, De Luca G. Parathyroid Hormone Levels and High-Residual Platelet Reactivity in Patients Receiving Dual Antiplatelet Therapy With Acetylsalicylic Acid and Clopidogrel or Ticagrelor. Cardiovasc Ther 2017; 34:209-15. [PMID: 27086085 DOI: 10.1111/1755-5922.12188] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND High-residual-on-treatment platelet reactivity still represents a challenging issue, potentially vanishing the benefits of dual antiplatelet treatment in patients with coronary artery disease. However, very few is known on the determinants of suboptimal response to antiplatelet agents. Recent interests have emerged on the potential prothrombotic effect of parathyroid hormone (PTH). Therefore, the aim of the present study was to assess the impact of parathyroid hormone (PTH) on platelet reactivity in patients receiving DAPT after an acute coronary syndrome or PCI. METHODS Patients treated with DAPT (ASA and clopidogrel or ticagrelor) were scheduled for platelet function assessment at 30- to 90-days postdischarge. By whole blood impedance aggregometry, HRPR was considered for ASPI test >862 AU*min (for ASA) and ADP test values ≥417 AU*min (for ADP antagonists). RESULTS We included 362 patients on DAPT, 125 (34.5%) receiving clopidogrel, and 237 (65.5%) on ticagrelor. Patients were divided according to PTH quartiles values (<45.8; 45.8-60.3; 60.4-88; ≥88.1 pg/mL). Higher PTH was associated with older age (P = 0.001); renal failure (P < 0.001), higher HDL cholesterol (P = 0.006) and creatinine (P < 0.001) and lower 25-OH cholecalciferol (P < 0.001). Suboptimal response to ASA was infrequent (2.8%), and not influenced by the levels of PTH (P = 0.57). ADP-mediated platelet aggregation was significantly increased in patients with higher PTH (P = 0.03), with an absolute increase in the prevalence of HRPR to ADP antagonists for higher PTH (24.7% vs. 40%, P = 0.007 for 4th vs. 1-3rd quartiles, adjusted OR[95%CI] = 2.04[1.14-3.64], P = 0.02). By the use of the ROC curve, we identified PTH levels above 96.7 pg/mL as the best predictor of HRPR with ADP antagonists (adjusted OR[95%CI] = 2.52[1.31-4.87], P = 0.006). Higher rate of HRPR was confirmed for PTH >96.7 pg/mL among the subgroup of patients on clopidogrel (51.5 vs. 85.7%, P = 0.001; adjusted OR[95%CI] = 12.5[2.6-60.9], P = 0.002), but not among ticagrelor-treated patients (11.3 vs. 16.7%, P = 0.31; adjusted OR[95%CI] = 1.55[0.56-4.6], P = 0.42). CONCLUSION In patients receiving dual antiplatelet therapy for coronary artery disease, higher PTH levels are associated with an increased ADP-mediated platelet reactivity and suboptimal response to clopidogrel, especially for values above 96.7 pg/mL, while not influencing the effectiveness of ASA and ticagrelor.
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Affiliation(s)
- Monica Verdoia
- Department of Cardiology, Ospedale "Maggiore della Carità", Eastern Piedmont University, Novara, Italy
| | - Patrizia Pergolini
- Clinical Chemistry, Ospedale "Maggiore della Carità", Eastern Piedmont University, Novara, Italy
| | - Roberta Rolla
- Clinical Chemistry, Ospedale "Maggiore della Carità", Eastern Piedmont University, Novara, Italy
| | - Matteo Nardin
- Department of Cardiology, Ospedale "Maggiore della Carità", Eastern Piedmont University, Novara, Italy
| | - Lucia Barbieri
- Department of Cardiology, Ospedale "Maggiore della Carità", Eastern Piedmont University, Novara, Italy
| | - Alon Schaffer
- Department of Cardiology, Ospedale "Maggiore della Carità", Eastern Piedmont University, Novara, Italy
| | - Giorgio Bellomo
- Clinical Chemistry, Ospedale "Maggiore della Carità", Eastern Piedmont University, Novara, Italy
| | - Paolo Marino
- Department of Cardiology, Ospedale "Maggiore della Carità", Eastern Piedmont University, Novara, Italy
| | | | - Giuseppe De Luca
- Department of Cardiology, Ospedale "Maggiore della Carità", Eastern Piedmont University, Novara, Italy
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Kalla A, Krishnamoorthy P, Gopalakrishnan A, Garg J, Patel NC, Figueredo VM. Primary hyperparathyroidism predicts hypertension: Results from the National Inpatient Sample. Int J Cardiol 2017; 227:335-337. [DOI: 10.1016/j.ijcard.2016.11.080] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 11/05/2016] [Indexed: 11/28/2022]
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Tuna MM, Doğan BA, Arduç A, Imga NN, Tütüncü Y, Berker D, Güler S. Impaired endothelial function in patients with mild primary hyperparathyroidism improves after parathyroidectomy. Clin Endocrinol (Oxf) 2015; 83:951-6. [PMID: 25393455 DOI: 10.1111/cen.12666] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Revised: 10/03/2014] [Accepted: 11/10/2014] [Indexed: 11/27/2022]
Abstract
BACKGROUND Primary hyperparathyroidism (PHPT) is associated with cardiovascular morbidity; however, data on the reversibility of cardiovascular disease in mild primary hyperparathyroidism are conflicting. The aim of this study was to assess endothelial function in patients with mild PHPT before and after parathyroidectomy (Ptx). METHODS We prospectively evaluated 53 patients with mild PHPT (Group 1; 45 women, eight men; aged 52 ± 3·1 years) and 46 healthy control subjects (Group 2; 38 women, eight men; aged 46 ± 9·5 years). Endothelial function was measured as flow-mediated dilation (FMD) and carotid intima-media thickness (CIMT) using Doppler ultrasonography. Patients with diabetes mellitus, coronary heart disease, impaired renal function, hyperthyroidism, hypothyroidism and a history of smoking were excluded from the study. Patients were studied at baseline and 6-12 months after the first evaluation. RESULTS There were no differences with respect to age, gender and BMI between the two groups. Hypertension prevalence was three times higher in group 1 than in controls. % FMD was lower in group 1 than in group 2 (2·6 ± 1·2 vs 14·8 ± 9·6, P < 0·001). CIMT was higher in patients with PHPT than controls (0·69 ± 0·18 vs 0·61 ± 0·12, P = 0·045). This significance remained when hypertensive patients were excluded from the analysis. While FMD and CIMT improved significantly after Ptx, there were no differences in mild PHPT patients who followed without parathyroidectomy. CONCLUSION FMD and CIMT are impaired in patients with mild PHPT compared to controls and improved significantly after a successful Ptx. Ptx improves endothelial function in patients with mild PHPT that may lead to decreased cardiovascular morbidity and mortality.
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Affiliation(s)
- Mazhar M Tuna
- Department of Metabolism, Medical Faculty of Endocrinology, Dicle University, Diyarbakir, Turkey
| | - Berçem A Doğan
- Department of Endocrinology and Metabolism, Ankara Numune Training and Research Hospital, Ankara, Turkey
| | - Ayşe Arduç
- Diabetes, Endocrine and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Washington, DC, USA
| | - Narin Nasiroğlu Imga
- Department of Endocrinology and Metabolism, Ankara Numune Training and Research Hospital, Ankara, Turkey
| | - Yasemin Tütüncü
- Department of Endocrinology and Metabolism, Haydarpaşa Numune Training and Research Hospital, Istanbul, Turkey
| | - Dilek Berker
- Department of Endocrinology and Metabolism, Ankara Numune Training and Research Hospital, Ankara, Turkey
| | - Serdar Güler
- Department of Metabolism, Medical Faculty of Endocrinology, Hitit University, Çorum, Turkey
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Verheyen ND, Kienreich K, Gaksch M, van Ballegooijen AJ, Grübler MR, Hartaigh BÓ, Schmid J, Fahrleitner-Pammer A, Kraigher-Krainer E, Colantonio C, Belyavskiy E, Treiber G, Catena C, Brussee H, Pieske B, März W, Tomaschitz A, Pilz S. Plasma Parathyroid Hormone Is Independently Related to Nocturnal Blood Pressure in Hypertensive Patients: The Styrian Hypertension Study. J Clin Hypertens (Greenwich) 2015; 18:543-50. [DOI: 10.1111/jch.12710] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2015] [Revised: 08/12/2015] [Accepted: 08/16/2015] [Indexed: 12/21/2022]
Affiliation(s)
| | - Katharina Kienreich
- Department of Internal Medicine; Division of Endocrinology and Metabolism; Medical University of Graz; Graz Austria
| | - Martin Gaksch
- Department of Internal Medicine; Division of Endocrinology and Metabolism; Medical University of Graz; Graz Austria
| | | | - Martin R. Grübler
- Department of Internal Medicine; Division of Endocrinology and Metabolism; Medical University of Graz; Graz Austria
| | - Briain Ó. Hartaigh
- Department of Radiology; Dalio Institute of Cardiovascular Imaging; NewYork-Presbyterian Hospital and the Weill Cornell Medical College; New York NY
- Department of Internal Medicine; Section of Geriatrics; Yale School of Medicine; Adler Geriatric Center; New Haven CT
| | - Johannes Schmid
- Department of Cardiology; Medical University of Graz; Graz Austria
| | - Astrid Fahrleitner-Pammer
- Department of Internal Medicine; Division of Endocrinology and Metabolism; Medical University of Graz; Graz Austria
| | - Elisabeth Kraigher-Krainer
- Medizinische Klinik mit Schwerpunkt Kardiologie; Campus Virchow-Klinikum; Charité-Universitaetsmedizin Berlin; Berlin Germany
| | | | - Evgeny Belyavskiy
- Medizinische Klinik mit Schwerpunkt Kardiologie; Campus Virchow-Klinikum; Charité-Universitaetsmedizin Berlin; Berlin Germany
| | - Gerlies Treiber
- Department of Internal Medicine; Division of Endocrinology and Metabolism; Medical University of Graz; Graz Austria
| | - Cristiana Catena
- Clinical Institute of Medical and Chemical Laboratory Diagnostics; Medical University of Graz; Graz Austria
| | - Helmut Brussee
- Department of Cardiology; Medical University of Graz; Graz Austria
| | - Burkert Pieske
- Department of Cardiology; Medical University of Graz; Graz Austria
- Medizinische Klinik mit Schwerpunkt Kardiologie; Campus Virchow-Klinikum; Charité-Universitaetsmedizin Berlin; Berlin Germany
| | - Winfried März
- Hypertension Unit; Internal Medicine; Department of Experimental and Clinical Medical Sciences; University of Udine; Udine Italy
- Synlab Academy; Synlab Services LLC; Mannheim Germany
- Medical Clinic V (Nephrology, Hypertensiology, Endocrinology); Medical Faculty Mannheim; Ruperto Carola University Heidelberg; Mannheim Germany
| | - Andreas Tomaschitz
- Department of Cardiology; Medical University of Graz; Graz Austria
- Medizinische Klinik mit Schwerpunkt Kardiologie; Campus Virchow-Klinikum; Charité-Universitaetsmedizin Berlin; Berlin Germany
- Specialist Clinic for Rehabilitation; PV Bad Aussee; Bad Aussee Austria
| | - Stefan Pilz
- Department of Internal Medicine; Division of Endocrinology and Metabolism; Medical University of Graz; Graz Austria
- Department of Epidemiology and Biostatistics; EMGO Institute for Health and Care Research; VU University Medical Centre; Amsterdam the Netherlands
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Abstract
PURPOSE OF REVIEW To provide an overview of the association between vitamin D deficiency and atherosclerosis. RECENT FINDINGS Vitamin D exerts protective effects on atherosclerosis through multiple mechanisms. It has been shown to protect against endothelial dysfunction, vascular smooth muscle cell proliferation and migration, and modulation of the immune system, as well as the inflammatory response. In addition, vitamin D has been shown to have systemic effects on insulin resistance, dyslipidemia, and hypertension. SUMMARY Vitamin D deficiency is widely prevalent in the United States and worldwide. Although deficiency of this fat-soluble vitamin is usually associated with musculoskeletal disorder, it is associated with a wide range of disease processes that include multiple organ systems. Recently, there has been mounting evidence linking vitamin D deficiency to cardiovascular disease and atherosclerosis.
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Vaidya A, Curhan GC, Paik JM, Kronenberg H, Taylor EN. Hypertension, Antihypertensive Medications, and Risk of Incident Primary Hyperparathyroidism. J Clin Endocrinol Metab 2015; 100:2396-404. [PMID: 25885946 PMCID: PMC4454810 DOI: 10.1210/jc.2015-1619] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
CONTEXT Hypertension is associated with higher PTH levels, and specific antihypertensive medications may modulate PTH. Whether hypertension or the use of specific antihypertensive medications influences the risk of developing incident primary hyperparathyroidism (P-HPTH) is not known. OBJECTIVE The purpose of this study was to investigate whether a history of hypertension and the use of specific antihypertensive medications determine the risk for developing P-HPTH in a large prospective study. DESIGN/PARTICIPANTS A longitudinal prospective cohort of female nurses in the Nurses' Health Study I (n = 75 600), who did not have P-HPTH at baseline and completed a questionnaire assessment of lifetime history of P-HPTH were followed from 1986 to 2008. Most participants were white and postmenopausal. SETTING The study was a nationwide cohort study. MAIN OUTCOME MEASURE Incident P-HPTH was assessed initially via questionnaire and then was confirmed by medical record review. Cox proportional hazards models were used to adjust for potential confounders. RESULTS We documented 347 incident cases of P-HPTH during 1 719 416 person-years of follow-up. The age-adjusted relative risk (RR) for incident P-HPTH associated with hypertension was 1.80 (95% confidence interval [CI], 1.43-2.26), and the multivariate-adjusted RR was 1.45 (95% CI, 1.10-1.91). Among participants with a history of hypertension, the use of furosemide, when compared with the use of other antihypertensive medications, was associated with increased risk for developing P-HPTH; age-adjusted RR for incident P-HPTH was 1.79 (95% CI, 1.15-2.79) and multivariate-adjusted RR was 1.71 (95% CI, 1.08-2.71). CONCLUSIONS In a large longitudinal prospective cohort study of mostly older white women, a history of hypertension and use of furosemide were associated with a significantly higher risk of developing P-HPTH.
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Affiliation(s)
- Anand Vaidya
- Division of Endocrinology, Diabetes, and Hypertension (A.V.), Division of Renal Medicine (G.C.C., J.M.P.), Channing Division of Network Medicine (G.C.C., J.M.P., E.N.T.), Brigham and Women's Hospital (A.V., G.C.C., J.M.P., E.N.T.), and Endocrine Unit (H.K.), Massachusetts General Hospital, Harvard Medical School (A.V., G.C.C., J.M.P., H.K.), Boston, Massachusetts 02115; and Division of Nephrology and Transplantation (E.N.T.), Maine Medical Center, Portland, Maine 04102
| | - Gary C Curhan
- Division of Endocrinology, Diabetes, and Hypertension (A.V.), Division of Renal Medicine (G.C.C., J.M.P.), Channing Division of Network Medicine (G.C.C., J.M.P., E.N.T.), Brigham and Women's Hospital (A.V., G.C.C., J.M.P., E.N.T.), and Endocrine Unit (H.K.), Massachusetts General Hospital, Harvard Medical School (A.V., G.C.C., J.M.P., H.K.), Boston, Massachusetts 02115; and Division of Nephrology and Transplantation (E.N.T.), Maine Medical Center, Portland, Maine 04102
| | - Julie M Paik
- Division of Endocrinology, Diabetes, and Hypertension (A.V.), Division of Renal Medicine (G.C.C., J.M.P.), Channing Division of Network Medicine (G.C.C., J.M.P., E.N.T.), Brigham and Women's Hospital (A.V., G.C.C., J.M.P., E.N.T.), and Endocrine Unit (H.K.), Massachusetts General Hospital, Harvard Medical School (A.V., G.C.C., J.M.P., H.K.), Boston, Massachusetts 02115; and Division of Nephrology and Transplantation (E.N.T.), Maine Medical Center, Portland, Maine 04102
| | - Henry Kronenberg
- Division of Endocrinology, Diabetes, and Hypertension (A.V.), Division of Renal Medicine (G.C.C., J.M.P.), Channing Division of Network Medicine (G.C.C., J.M.P., E.N.T.), Brigham and Women's Hospital (A.V., G.C.C., J.M.P., E.N.T.), and Endocrine Unit (H.K.), Massachusetts General Hospital, Harvard Medical School (A.V., G.C.C., J.M.P., H.K.), Boston, Massachusetts 02115; and Division of Nephrology and Transplantation (E.N.T.), Maine Medical Center, Portland, Maine 04102
| | - Eric N Taylor
- Division of Endocrinology, Diabetes, and Hypertension (A.V.), Division of Renal Medicine (G.C.C., J.M.P.), Channing Division of Network Medicine (G.C.C., J.M.P., E.N.T.), Brigham and Women's Hospital (A.V., G.C.C., J.M.P., E.N.T.), and Endocrine Unit (H.K.), Massachusetts General Hospital, Harvard Medical School (A.V., G.C.C., J.M.P., H.K.), Boston, Massachusetts 02115; and Division of Nephrology and Transplantation (E.N.T.), Maine Medical Center, Portland, Maine 04102
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Association between parathyroid hormone levels and inflammatory markers among US adults. Mediators Inflamm 2014; 2014:709024. [PMID: 24782595 PMCID: PMC3980926 DOI: 10.1155/2014/709024] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Accepted: 02/27/2014] [Indexed: 02/07/2023] Open
Abstract
Background and Aims. High levels of parathyroid hormone (PTH) appear to be associated with an increased mortality. Previous studies concerning the relationship of inflammatory markers with hyperparathyroidism have yielded inconsistent results. This study investigated whether serum PTH concentrations were independently associated with several inflammatory markers among the US adults. Materials and Methods. Using data from the National Health and Nutrition Examination Survey, we examined the relation between serum PTH and C-reactive protein (CRP), red cell distribution width (RDW), and platelet-to-lymphocyte ratio (PLR) levels with weighted linear regression. Additionally, we examined the relation with increased modified Glasgow Prognostic Score (mGPS) by using weighted logistic regression. Results. CRP, RDW, and PLR values increased with increasing serum PTH concentration. After extensively adjusting for covariates, CRP and RDW increased linearly and across PTH categories (all P < 0.001), while PLR marginally increased (P = 0.190 and P = 0.095 using PTH as a categorical and continuous variable, resp.). The odds ratio of increased mGPS was 1.11 and 1.31 across PTH categories and with increasing PTH levels continuously. Conclusion. These nationally representative data indicate that serum PTH levels are independently associated with several inflammatory markers in the US population. The casual relationship between PTH levels and inflammation remains to be elucidated.
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Luk A, Ezzat S, Butany J. Pathology, pathophysiology, and treatment strategies of endocrine disorders and their cardiac complications. Semin Diagn Pathol 2013; 30:245-62. [PMID: 24144293 DOI: 10.1053/j.semdp.2013.06.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The cardiovascular system is affected by a multitude of endocrine disorders, including dysfunction of the thyroid, calcium, glucocorticoids, insulin/glucose, and growth hormone axes. Since most of these changes in the cardiovascular system are reversible when treated, early diagnosis is important, as if left untreated, they may become fatal. This review focuses on the pathophysiology, clinical presentation, pathology, and treatment of patients with these endocrine diseases who present with a variety of cardiovascular manifestations. Neuroendocrine tumors presenting with the carcinoid syndrome and their cardiovascular manifestations are also discussed.
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Affiliation(s)
- Adriana Luk
- Department of Medicine, Toronto General Hospital/University Health Network, Toronto, Ontario, Canada
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Bosworth C, Sachs MC, Duprez D, Hoofnagle AN, Ix JH, Jacobs DR, Peralta CA, Siscovick DS, Kestenbaum B, de Boer IH. Parathyroid hormone and arterial dysfunction in the multi-ethnic study of atherosclerosis. Clin Endocrinol (Oxf) 2013; 79:429-36. [PMID: 23402353 PMCID: PMC3664253 DOI: 10.1111/cen.12163] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 12/20/2012] [Accepted: 01/29/2013] [Indexed: 12/15/2022]
Abstract
OBJECTIVE High circulating concentrations of parathyroid hormone (PTH) have been associated with increased risks of hypertension, left ventricular hypertrophy, congestive heart failure and cardiovascular mortality. Impaired arterial function is a potential mechanism for these associations. We tested whether serum PTH concentration is associated with measures of arterial function. DESIGN Cross-sectional study. PARTICIPANTS A total of 6545 persons without clinical cardiovascular disease participating in the community-based Multi-Ethnic Study of Atherosclerosis. MEASUREMENTS Brachial artery flow-mediated dilation (FMD) as well as aortic pulse pressure and arterial pulse parameters derived from Windkessel modelling of the radial pressure waveform. RESULTS Higher serum PTH concentration was associated with lower brachial artery FMD (mean difference -0·09% per 10 pg/ml PTH), higher aortic pulse pressure (0·53 mmHg per 10 pg/ml) and reduced Windkessel capacitive index C1 (large artery elasticity, -0·12 ml/mmHg × 10 per 10 pg/ml), adjusting for potential confounding variables (all P-values ≤ 0·001). These relationships were independent of serum calcium concentration, serum 25-hydroxyvitamin D concentration and estimated glomerular filtration rate and were consistent across relevant participant subgroups. Associations of PTH with aortic pulse pressure and capacitive index C1 were attenuated after adjustment for blood pressure. Serum PTH concentration was not associated with the oscillatory index C2 (small artery elasticity). CONCLUSIONS Higher serum PTH concentration was associated with impaired endothelial function, increased aortic pulse pressure and decreased capacitive index C1 in a large, diverse, community-based population. These relationships may help explain previously observed associations of elevated PTH with cardiovascular disease.
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Affiliation(s)
- Cortney Bosworth
- Division of Nephrology and Kidney Research Institute, Department of Medicine, University of Washington, Seattle, WA, USA
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Alexander RT, Dimke H, Cordat E. Proximal tubular NHEs: sodium, protons and calcium? Am J Physiol Renal Physiol 2013; 305:F229-36. [PMID: 23761670 DOI: 10.1152/ajprenal.00065.2013] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Na⁺/H⁺ exchange activity in the apical membrane of the proximal tubule is fundamental to the reabsorption of Na⁺ and water from the filtrate. The role of this exchange process in bicarbonate reclamation and, consequently, the maintenance of acid-base homeostasis has been appreciated for at least half a century and remains a pillar of renal tubular physiology. More recently, apical Na⁺/H⁺ exchange, mediated by Na⁺/H⁺ exchanger isoform 3 (NHE3), has been implicated in proximal tubular reabsorption of Ca²⁺ and Ca²⁺ homeostasis in general. Overexpression of NHE3 increased paracellular Ca²⁺ flux in a proximal tubular cell model. Consistent with this observation, mice with genetic deletion of Nhe3 have a noticable renal Ca²⁺ leak. These mice also display decreased intestinal Ca²⁺ uptake and osteopenia. This review highlights the traditional roles of proximal tubular Na⁺/H⁺ exchange and summarizes recent novel findings implicating the predominant isoform, NHE3, in Ca²⁺ homeostasis.
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Affiliation(s)
- R Todd Alexander
- Department of Pediatrics, Edmonton Clinic Health Academy, 11405-87 Ave., University of Alberta, Edmonton, AB, Canada T6G 2R7.
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van Ballegooijen AJ, Visser M, Cotch MF, Arai AE, Garcia M, Harris TB, Launer LJ, Eiríksdóttir G, Gudnason V, Brouwer IA. Serum vitamin D and parathyroid hormone in relation to cardiac structure and function: the ICELAND-MI substudy of AGES-Reykjavik. J Clin Endocrinol Metab 2013; 98:2544-52. [PMID: 23585664 PMCID: PMC3667250 DOI: 10.1210/jc.2012-4252] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
CONTEXT Emerging evidence suggests that vitamin D and PTH may play a role in the development of cardiac diseases. OBJECTIVE We investigated whether 25-hydroxyvitamin D (25OHD) and PTH concentrations are cross-sectionally associated with cardiac structure and function using magnetic resonance imaging (MRI). DESIGN, SETTING, AND PARTICIPANTS ICELAND-MI is a substudy of the Age, Gene/Environment Susceptibility-Reykjavik Study, an older-aged community-dwelling cohort with oversampling of participants with diabetes (29%) and measurements between 2004 and 2007. Serum 25OHD concentrations were measured using an immunoassay (n = 992). Intact PTH concentrations were measured using a 2-site immunoassay (n = 203). We included 969 participants for this cross-sectional analysis (mean age 76 ± 5.3 years, 51% female). Mean 25OHD was 54.2 ± 25.5 nmol/L and the median PTH was 4.5 pmol/L (range 1.5-18). MAIN OUTCOMES MRI to measure cardiac structure and function was the main outcome. RESULTS The lowest 25OHD category (<25 nmol/L) compared with the highest category (≥75 nmol/L) was associated with a smaller left and right atrial area in unadjusted analyses; however, the associations became nonsignificant after adjustment for covariates. The highest PTH quartile compared with the lowest quartile was significantly associated with a 7.3 g (95% confidence interval 0.8, 13.8) greater left ventricular (LV) mass and a 5.1% (-9.1, -1.1) lower LV ejection fraction compared with the lowest PTH quartile in the fully adjusted model. CONCLUSIONS Serum 25OHD concentrations were not associated with MRI measures in an older white population. Higher PTH concentrations were associated with greater LV mass and lower systolic function and may point to a potential role for PTH as a determinant of cardiac remodeling.
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Affiliation(s)
- A J van Ballegooijen
- Department of Health Sciences and the EMGO+ Institute for Health and Care Research, VU University, 1081 HV Amsterdam, The Netherlands.
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Vaidya A, Williams JS. The relationship between vitamin D and the renin-angiotensin system in the pathophysiology of hypertension, kidney disease, and diabetes. Metabolism 2012; 61:450-8. [PMID: 22075270 PMCID: PMC3290690 DOI: 10.1016/j.metabol.2011.09.007] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2011] [Revised: 09/14/2011] [Accepted: 09/21/2011] [Indexed: 12/01/2022]
Abstract
Vitamin D has been implicated in the pathophysiology of extraskeletal conditions such as hypertension, kidney disease, and diabetes via its ability to negatively regulate the renin-angiotensin system (RAS). This article reviews the evidence supporting a link between vitamin D and the RAS in these conditions, with specific emphasis on translational observations and their limitations. A literature review of animal and human studies evaluating the role of vitamin D in hypertension, kidney disease, and diabetes was performed. Excess activity of the RAS has been implicated in the pathogenesis of hypertension, chronic kidney disease, decreased insulin secretion, and insulin resistance. Animal studies provide strong support for 1,25-dihydroxyvitamin D(3)-mediated downregulation of renin expression and RAS activity via its interaction with the vitamin D receptor. Furthermore, the activity of vitamin D metabolites in animals is associated with reductions in blood pressure, proteinuria and renal injury, and with improved β-cell function. Many observational, and a few interventional, studies in humans have supported these findings; however, there is a lack of well-designed prospective human interventional studies to definitively assess clinical outcomes. There is a need for more well-designed prospective interventional studies to validate this hypothesis in human clinical outcomes.
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Affiliation(s)
- Anand Vaidya
- Division of Endocrinology, Diabetes, and Hypertension, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
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Effect of cinacalcet on renal electrolyte handling and systemic arterial blood pressure in kidney transplant patients with persistent hyperparathyroidism. Transplantation 2011; 92:883-9. [PMID: 21876476 DOI: 10.1097/tp.0b013e31822d87e8] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND The calcimimetic cinacalcet has recently been increasingly used for persistent hyperparathyroidism after renal transplantation. The present study investigated the short-term effects of cinacalcet on urinary electrolyte concentration and arterial blood pressure in kidney transplant patients with persistent hyperparathyroidism. METHODS In a prospective controlled single-center cross-over study, we examined 10 stable kidney transplant patients (mean estimated glomerular filtration rate 51±10 mL/min/1.73 m(2)) who received cinacalcet daily for persistent hyperparathyroidism. Urine specimens were collected at baseline and every 2 hr for a total study period of 6 hr after ingestion of 30 mg cinacalcet and without cinacalcet. Intact parathyroid hormone was determined at baseline and 2 hr later. Using ambulatory blood pressure measurement, arterial blood pressure was determined every 15 min. RESULTS Intact parathyroid hormone was significantly reduced with cinacalcet as compared with controls (-37±27.7% vs. -9.6±10.3%, P=0.009). With cinacalcet, urinary calcium and magnesium concentration were increased (P=0.042 and P=0.007, respectively) and differed significantly as compared with the control phase without cinacalcet. After 4 hr, an increased urinary sodium concentration was also found compared with the control phase (P=0.039). Systolic blood pressure was reduced with cinacalcet (P<0.001) and differed significantly from control phase (-13.7±9.9 mm Hg vs. -3.2±5.2 mm Hg after 2 hr, P=0.009; -18.1±10.8 mm Hg vs. -1.9±5.2 mm Hg after 4 hr, P=0.001). CONCLUSIONS In the short term, cinacalcet increases the urinary concentration of calcium, magnesium, and sodium. The observed antihypertensive effect might be beneficial in patients with a high cardiovascular risk after kidney transplantation.
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Nazarian S, St Peter JV, Boston RC, Jones SA, Mariash CN. Vitamin D3 supplementation improves insulin sensitivity in subjects with impaired fasting glucose. Transl Res 2011; 158:276-81. [PMID: 22005267 PMCID: PMC3196850 DOI: 10.1016/j.trsl.2011.05.002] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2011] [Revised: 04/18/2011] [Accepted: 05/13/2011] [Indexed: 12/20/2022]
Abstract
Vitamin D has in vitro and in vivo effects on β cells and insulin sensitivity. Vitamin D deficiency (VDD) has been associated with the onset and progression of type 2 diabetes mellitus (DM-2). However, studies involving supplementation of vitamin D in subjects with previously established diabetes have demonstrated inconsistent effects on insulin sensitivity. The aim of this open-label study was to assess the effects of high-dose vitamin D3 supplementation on insulin sensitivity in subjects with VDD and impaired fasting glucose. We studied 8 subjects with VDD and prediabetes with the modified, frequently sampled intravenous glucose tolerance (mFSIGT) test before and after vitamin D supplementation. Vitamin D3 was administered as 10,000 IU daily for 4 weeks. The mFSIGT was analyzed with MinMod Millennium (purchased from Dr. Richard Bergman, Keck School of Medicine of USC, Los Angeles, Calif) to obtain estimates of acute insulin response to glucose (AIRg), insulin sensitivity (SI), and disposition index (DI). We found that AIRg decreased (P = 0.011) and SI increased (P = 0.012) after a intervention with vitamin D. If these findings are repeated in a randomized, double-blind study, the results indicate that orally administered high-dose vitamin D3 supplementation improves insulin sensitivity in subjects with impaired fasting glucose and suggests that high-dose vitamin D3 supplementation might provide an inexpensive public health measure in preventing, or at least delaying, the progression from impaired fasting glucose to diabetes.
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Affiliation(s)
- Shaban Nazarian
- Division of Endocrinology and Diabetes, University of Minnesota, Minneapolis, USA
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Elevation of parathyroid hormone levels in atrial fibrillation. J Am Coll Cardiol 2011; 57:2542-3. [PMID: 21679857 DOI: 10.1016/j.jacc.2011.01.041] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2010] [Revised: 11/23/2010] [Accepted: 01/11/2011] [Indexed: 12/29/2022]
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Ritz D, Nourrit-Poirette F. Les effets délétères de la parathormone sur le coeur. Nephrol Ther 2011; 7:H13-6. [DOI: 10.1016/s1769-7255(11)70006-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Affiliation(s)
- Anand Vaidya
- Division of Endocrinology, Diabetes, and Hypertension, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Mass, USA
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Tiffin N, Meintjes A, Ramesar R, Bajic VB, Rayner B. Computational analysis of candidate disease genes and variants for salt-sensitive hypertension in indigenous Southern Africans. PLoS One 2010; 5:e12989. [PMID: 20886000 PMCID: PMC2946338 DOI: 10.1371/journal.pone.0012989] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2010] [Accepted: 08/29/2010] [Indexed: 01/06/2023] Open
Abstract
Multiple factors underlie susceptibility to essential hypertension, including a significant genetic and ethnic component, and environmental effects. Blood pressure response of hypertensive individuals to salt is heterogeneous, but salt sensitivity appears more prevalent in people of indigenous African origin. The underlying genetics of salt-sensitive hypertension, however, are poorly understood. In this study, computational methods including text- and data-mining have been used to select and prioritize candidate aetiological genes for salt-sensitive hypertension. Additionally, we have compared allele frequencies and copy number variation for single nucleotide polymorphisms in candidate genes between indigenous Southern African and Caucasian populations, with the aim of identifying candidate genes with significant variability between the population groups: identifying genetic variability between population groups can exploit ethnic differences in disease prevalence to aid with prioritisation of good candidate genes. Our top-ranking candidate genes include parathyroid hormone precursor (PTH) and type-1angiotensin II receptor (AGTR1). We propose that the candidate genes identified in this study warrant further investigation as potential aetiological genes for salt-sensitive hypertension.
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Affiliation(s)
- Nicki Tiffin
- Division of Nephrology and Hypertension, University of Cape Town/Groote Schuur Hospital, Cape Town, South Africa.
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Farahnak P, Lind L, Mattala K, Nilsson IL. Parathyroid Hormone's Acute Effect on Vasodilatory Function. CLINICAL MEDICINE INSIGHTS-ENDOCRINOLOGY AND DIABETES 2010; 3:37-42. [PMID: 22879785 PMCID: PMC3411527 DOI: 10.4137/cmed.s4650] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Parathyroid hormone (PTH) seems to affect the risk of cardiovascular disease. The aim of the present study was to investigate PTH's acute effect on endothelial vasodilatory function in forearm resistance vessels. Ten healthy subjects underwent forearm venous occlusion plethysmography. We measured forearm blood flow at baseline and at a stable, locally increased PTH level after intra-arterial infusion of metacholine and nitroprusside. The contralateral arm served as a control. Ionized calcium (Ca++) and PTH values were normal in all subjects at baseline (1.26 ± 0.02 mM/L, 3.6 ± 1.2 pM/L). After 30 minutes of PTH infusion, the PTH level increased in the active arm (13.8 ± 4.0 pM/L P < 0.01), while the Ca++ level was unchanged (1.25 ± 0.04; mM/L). Both the PTH and the Ca++ level in the contralateral arm remained unchanged, which indicates no systemic influence. The endothelial-dependent vasodilation was inversely correlated to the Ca++ level at baseline (r = -0.75, P < 0.05) and after PTH infusion (r = -0.68, P < 0.05). The vasodilatory function was not affected during PTH-infusion.
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Smajilovic S, Schaal-Jensen R, Jabbari R, Smajilovic U, Haunso S, Tfelt-Hansen J. Effect of intermittent versus continuous parathyroid hormone in the cardiovascular system of rats. Open Cardiovasc Med J 2010; 4:110-6. [PMID: 20461233 PMCID: PMC2866532 DOI: 10.2174/1874192401004010110] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2010] [Revised: 03/08/2010] [Accepted: 03/10/2010] [Indexed: 11/22/2022] Open
Abstract
Objective: PTH increases ionic calcium concentration in the serum, acting primarily on bone and kidney cells through the type 1 PTH receptor. Interestingly, PTH stimulates bone formation when administrated intermittently but causes severe bone loss with continuous administration. Daily injections of PTH are used as the most promising anabolic agent in the treatment of severe osteoporosis. Elevated PTH is reported an independent risk factor for left ventricle hypertrophy. Design: in rats we investigated the effect of intermittent and continuous administration of PTH on blood pressure, heart rate and development of cardiac hypertrophy and fibrosis. Results: We did not find PTH to induce heart hypertrophy. In contrast, continuous administration of PTH the mRNA level of a hypertrophic marker gene, atrial natriuretic peptide. When comparing the effect of continuously versus injected PTH collagen 1 mRNA was significantly higher in continuously treated animals. Conclusion: our data demonstrated a decrease in heart rate upon continuous administration of PTH in rats. No changes in blood pressure were observed. Moreover, neither intermittent nor continuous administration of PTH induced ventricular hypertrophy. But continuous PTH induced a marker of collagen 1. Thus, these data did not reveal any negative effects of the injection of PTH on the cardiovascular system.
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Affiliation(s)
- Sanela Smajilovic
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, University of Copenhagen, Denmark
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Al-Hilali N, Hussain N, Ataia AI, Al-Azmi M, Al-Helal B, Johny KV. Hypertension and hyperparathyroidism are associated with left ventricular hypertrophy in patients on hemodialysis. Indian J Nephrol 2009; 19:153-7. [PMID: 20535251 PMCID: PMC2875705 DOI: 10.4103/0971-4065.59337] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Conflicting data for association between left ventricular hypertrophy (LVH) and secondary hyperparathyroidism has been reported previously among dialysis patients. The present study was conducted to evaluate the association of hyperparathyroidism and hypertension with LVH. Charts of 130 patients on hemodialysis for at least six months were reviewed. All were subjected to M-mode echocardiography. Left ventricular mass (LVM) was calculated by Devereux's formula. LVM Index (LVMI) was calculated by dividing LVM by body surface area. Sera were analyzed for intact parathyroid hormone (iPTH). iPTH of > 32 pmol/l and a mean blood pressure (MAP) of > 107 mmHg were considered high. Patients were stratified into groups according to their MAP and iPTH. A total of (47.7%) patients were males and 68 (52.3%) were females. Their median age was 57 years. The median duration on dialysis was 26 months. Forty eight (36.9%) patients had high BP and 54 (41.5%) had high iPTH. Both high BP and high iPTH were present in 38 (29.2%) patients. Analysis of the relationship between LVM, LVMI, MAP and iPTH showed that LVM and LVMI were significantly (P < 0.001) higher in patients with concomitant high BP and high iPTH. LVMI was significantly higher in patients with high iPTH alone. Concomitant high iPTH and high MAP increase the risk of LVH in hemodialysis patients. High iPTH alone might contribute in escalating LVH. Adequate control of hypertension and hyperparathyroidism might reduce the risk of developing LVH.
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Affiliation(s)
- N. Al-Hilali
- Department of Medicine, Mubarak Al-Kabeer Hospital, Kuwait
| | - N. Hussain
- Department of Medicine, Mubarak Al-Kabeer Hospital, Kuwait
| | - A. I. Ataia
- Department of Medicine, Mubarak Al-Kabeer Hospital, Kuwait
| | - M. Al-Azmi
- Department of Medicine, Mubarak Al-Kabeer Hospital, Kuwait
| | - B. Al-Helal
- Department of Medicine, Mubarak Al-Kabeer Hospital, Kuwait
| | - K. V. Johny
- Department of Medicine, Mubarak Al-Kabeer Hospital, Kuwait
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AGGRESSIVE CONTROL OF SECONDARY HYPERPARATHYROIDISM CAN RESULT IN IMMEDIATE EFFICIENT BLOOD PRESSURE CONTROL IN DIALYSIS PATIENTS. Nephrology (Carlton) 2009; 14:535-6. [DOI: 10.1111/j.1440-1797.2009.01134.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Lehmann A, Boblewski K, Bonna A, Maćkiewicz Z, Rybczyńska A. Hypertensive activity of synthesized PTH(25-34) and Ac-PTH(25-30)-NH2 in rats. Peptides 2009; 30:378-84. [PMID: 19013489 DOI: 10.1016/j.peptides.2008.10.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2008] [Revised: 10/14/2008] [Accepted: 10/14/2008] [Indexed: 11/20/2022]
Abstract
Parathyroid hormone (PTH) is secreted by parathyroid glands and is the main known factor that control plasma calcium concentration. There are many indications that PTH or products of PTH degradation influence the mean arterial blood pressure (MAP). These observations might be important in diseases accompanied with the overproduction of PTH such as primary hyperparathyroidism (PHPT). It was shown that the six amino acids PTH precursor-PRO-PTH with reversed sequence (PRO-rs), which contains a rare tripeptide -Arg-Lys-Lys- fragment, induces significant hypertensive response in rats. This strong alkali tripeptide is also present in the position 25-27 of the PTH molecule. The aim of the present study was to synthesize, by the solid phase peptide synthesis method, PTH fragments including the -Arg-Lys-Lys- sequence and test their influence on blood pressure and calcium plasma concentration in rats. Our study demonstrated that PTH(25-34) and the acetylated amide analogue of PTH(25-30), (Ac-PTH(25-30)-NH(2)) were hypertensive in the physiological doses. The presence of strong alkali sequence -Arg-Lys-Lys- in PTH(25-30) fragment is not sufficient to induce hypertension either in physiological or pharmacological doses in rats. Therefore, both the proximity of the -Arg-Lys-Lys- sequence and length of the peptide might also play roles as pressure factors.
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Affiliation(s)
- Artur Lehmann
- Department of Pathophysiology, Faculty of Pharmacy, Medical University of Gdańsk, Tuwima 15, 80-210 Gdańsk, Poland.
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McCarty MF, Barroso-Aranda J, Contreras F. Can moderate elevations of parathyroid hormone acutely increase risk for ischemic cardiac arrhythmias? Med Hypotheses 2009; 72:581-3. [PMID: 19188028 DOI: 10.1016/j.mehy.2008.12.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2008] [Accepted: 12/15/2008] [Indexed: 11/30/2022]
Abstract
There is suggestive evidence that chronic elevations of parathyroid hormone (PTH), associated with poor vitamin D status or low calcium intake, can increase risk for insulin resistance, weight gain, hypertension, and left ventricular hypertrophy, while stimulating production of acute phase reactants. New evidence that elevated PTH is prognostic for increased vascular mortality in very elderly subjects, prompts an examination of the possible impact of PTH on risk for arrhythmias. The cardiac effects of PTH are mediated by G protein-coupled receptors that activate phospholipase C (PLC). Catecholamines, angiotensin II, and endothelin have been shown to be arrhythmogenic for ischemic myocardium in animal studies; the receptors mediating this effect are all likewise linked to activation of PLC. Thus, it is reasonable to presume that a sufficient concentration of PTH can be arrhythmogenic in the ischemic heart. The extent to which this effect can be evoked by the high-normal PTH levels prevalent in many elderly subjects, can be assessed in epidemiological studies.
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Kanbay M, Turgut F, Uyar ME, Akcay A, Covic A. Causes and mechanisms of nondipping hypertension. Clin Exp Hypertens 2009; 30:585-97. [PMID: 18855262 DOI: 10.1080/10641960802251974] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Growing evidence indicates that nondippers have worsened cardiovascular outcomes than dippers. Ambulatory blood pressure monitoring with a lack of nocturnal BP fall (nondipping) have also been shown to be more closely associated with target organ damage and worsened cardiovascular outcome than in patients with essential hypertension with dipping pattern. The underlying pathogenetic mechanisms potentially linking nondipping with cardiovascular disease are not fully understood. There are multiple possible underlying pathophysiologic mechanisms in the impaired BP decline during the night. Extrinsic and intrinsic factors including abnormal neurohormonal regulation, lack of physical activity, nutritional factors such as increased dietary sodium intake, and smoking of tobacco have been implicated for blunted circadian rhythm of BP. Certain diseases such as diabetes and chronic renal diseases also affect the circadian BP rhythm. Currently, the clinical importance of nondipping is known well; however, the relationship between certain disease states and nondipping has not been fully explained yet. This paper will attempt to address to clarify the underlying basis for nondipping and the specific associations with various disease states.
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Affiliation(s)
- Mehmet Kanbay
- Department of Internal Medicine, Section of Nephrology, Fatih University School of Medicine, Ankara, Turkey.
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Abstract
OBJECTIVE The presence of parathyroid hormone receptor mRNA in a wide variety of tissues, including the endothelium, suggests that parathyroid hormone has potentially important effects in addition to the maintenance of calcium and phosphate homeostasis. We conducted a prospective study to examine the association between plasma intact parathyroid hormone levels and the subsequent risk of developing hypertension. METHODS We measured intact parathyroid hormone in 481 men without hypertension from the Health Professionals Follow-up Study. During 10 years of follow-up, we observed 142 cases of incident hypertension. Cox proportional hazards regression was used to adjust for age, race, body mass index, alcohol use, smoking, physical activity, predicted plasma 25-hydroxyvitamin D level, and other factors. RESULTS Median baseline levels of intact parathyroid hormone were 40.1 pg/ml in individuals who developed hypertension and 36.3 pg/ml in those who did not (P = 0.01). After multivariate adjustment, the relative risk for incident hypertension in men in the highest quartile of parathyroid hormone (median 56.0 pg/ml) compared with the lowest quartile of parathyroid hormone (median 26.3 pg/ml) was 1.83 (95% confidence interval 1.10-3.03; P for trend = 0.01). Analyses restricted to men in the lowest 90th percentage of the parathyroid hormone distribution (< or =58 pg/ml) yielded similar results. Further adjustment for the intake of calcium and sodium, as well as for season and fasting status at time of blood draw, did not materially change the results. CONCLUSION Plasma levels of intact parathyroid hormone, even within ranges considered normal, are positively and independently associated with a higher risk of incident hypertension.
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Abstract
The classical actions of parathyroid hormone (PTH) are well recognized, but its effects on other target tissues, such as the cardiovascular system, are less appreciated. Several studies have evaluated the effects of PTH in patients with primary hyperparathyroidism in order to understand potential cardiovascular effects in terms of hypertension, cardiovascular mortality, left ventricular function, and endothelial function. We review these studies and evaluate the cellular mechanisms that may affect these outcomes.
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Affiliation(s)
- Lorraine A Fitzpatrick
- Research and Development, Musculoskeletal Diseases, GlaxoSmithKline, 2301 Renaissance Boulevard, RN0420, King of Prussia, PA 19406, USA.
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Tai K, Need AG, Horowitz M, Chapman IM. Vitamin D, glucose, insulin, and insulin sensitivity. Nutrition 2008; 24:279-85. [PMID: 18187309 DOI: 10.1016/j.nut.2007.11.006] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2007] [Revised: 11/07/2007] [Accepted: 11/22/2007] [Indexed: 02/07/2023]
Abstract
This review examines available evidence of links between abnormalities of glucose and insulin metabolism and vitamin D deficiency. Possible mechanisms of action of vitamin D include stimulation of insulin secretion and effects on insulin sensitivity. Sun exposure usually implies greater outdoor physical activity, which in itself may have beneficial effects on insulin sensitivity, unrelated to serum 25-hydroxyvitamin D concentrations. The observed associations in humans among vitamin D, insulin, and glucose metabolism have not yet been confirmed by intervention studies and, hence, a causal association has not been established. Clinical trials are needed to determine whether vitamin D treatment of vitamin D-deficient individuals is able to prevent or treat diabetes mellitus.
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Affiliation(s)
- Kamilia Tai
- University of Adelaide Department of Medicine, Royal Adelaide Hospital, Adelaide, Australia.
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Chertow GM, Martin KJ. Current and Future Therapies for the Medical Management of Secondary Hyperparathyroidism. Semin Dial 2007. [DOI: 10.1111/j.1525-139x.1998.tb00363.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Ortega A, Pérez de Prada MT, Mateos-Cáceres PJ, Ramos Mozo P, González-Armengol JJ, González Del Castillo JM, Martín Sánchez J, Villarroel P, Santiago JL, Bosch RJ, Macaya C, Esbrit P, López-Farré AJ. Effect of parathyroid-hormone-related protein on human platelet activation. Clin Sci (Lond) 2007; 113:319-27. [PMID: 17501718 DOI: 10.1042/cs20070010] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Evidence suggests that PTHrP [PTH (parathyroid hormone)-related protein] can act as an inflammatory mediator in several pathological settings including cardiovascular disease. The aim of the present study was to determine whether PTHrP might be involved in human platelet activation. We used a turbidimetric method to determine platelet aggregation. The expression of PTH1R (PTH type 1 receptor) in human platelets was analysed by Western blot and flow cytometry analyses. PTHrP-(1–36) (10−7 mol/l) by itself failed to modify the activation of platelets. However, it significantly enhanced ADP-induced platelet activation, and also increased the ability of other agonists (thrombin, collagen and arachidonic acid) to induce platelet aggregation. H89 (10−6 mol/l) and 25×10−6 mol/l Rp-cAMPS (adenosine 3′,5′-cyclic monophosphorothioate Rp-isomer), two protein kinase A inhibitors, and 25×10−9 mol/l bisindolylmaleimide I, a protein kinase C inhibitor, partially decreased the enhancing effect of PTHrP-(1–36) on ADP-induced platelet activation. Meanwhile, 10−6 mol/l PTHrP-(7–34), a PTH1R antagonist, as well as 10−5 mol/l PD098059, a MAPK (mitogen-activated protein kinase) inhibitor, or a farnesyltransferase inhibitor abolished this effect of PTHrP-(1–36). Moreover, 10−7 mol/l PTHrP-(1–36) increased (2-fold over control) MAPK activation in human platelets. PTH1R was detected in platelets, and the number of platelets expressing it on their surface in patients during AMI (acute myocardial infarction) was not different from that in a group of patients with similar cardiovascular risk factors without AMI. Western blot analysis showed that total PTH1R protein levels were markedly higher in platelets from control than those from AMI patients. PTH1R was found in plasma, where its levels were increased in AMI patients compared with controls. In conclusion, human platelets express the PTH1R. PTHrP can interact with this receptor to enhance human platelet activation induced by several agonists through a MAPK-dependent mechanism.
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Affiliation(s)
- Arantxa Ortega
- Bone and Mineral Metabolism Laboratory, Fundación Jiménez Díaz, Madrid, Spain
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Kanbay M, Isik B, Akcay A, Ozkara A, Karakurt F, Turgut F, Alkan R, Uz E, Bavbek N, Yigitoglu R, Covic A. Relation between serum calcium, phosphate, parathyroid hormone and 'nondipper' circadian blood pressure variability profile in patients with normal renal function. Am J Nephrol 2007; 27:516-21. [PMID: 17703091 DOI: 10.1159/000107489] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2007] [Accepted: 07/16/2007] [Indexed: 11/19/2022]
Abstract
BACKGROUND AND AIMS In patients with renal disease, an association between abnormal circadian blood pressure profile and abnormalities in bone and mineral metabolism, including vascular calcifications, is well known. However, such a link has not yet been reported in hypertensive patients with normal renal function. We aimed to evaluate if higher serum phosphate, calcium, parathyroid hormone (PTH) level and the calcium x phosphate (Ca x P) product would be associated with a nondipper hypertension, in patients with normal renal function and without any PTH disorder. METHODS 190 hypertensive subjects with the following inclusion criteria were enrolled: (1) normal phosphate and PTH levels; (2) glomerular filtration rate (GFR) >60 ml/min, and (3) no history of calcium, phosphate, vitamin D medication and hyperparathyroidism. RESULTS Of the total population, 76 patients (40%) were classified as dippers and 114 (60%) as nondippers. Nondipper patients had higher levels of phosphate (3.70 +/- 0.61 vs. 3.35 +/- 0.44 mg/dl, p = 0.001), Ca x P product (35.4 +/- 6.5 vs. 31.5 +/- 5.0, p = 0.001) and PTH (75.7 +/- 28.8 vs. 46.6 +/- 17.1 pg/ml, p = 0.000) compared to dipper patients. Independent predictors (multiple regression) for nondipper hypertension were PTH (beta = 0.43, p = 0.001) and phosphate (beta = 0.9, p = 0.03). CONCLUSION We demonstrate a graded independent relation between higher levels of phosphate, PTH, Ca x P product and the risk of nondipping in hypertensive patients with an estimated GFR of >60 ml/min and normal mineral metabolism.
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Affiliation(s)
- Mehmet Kanbay
- Department of Internal Medicine, Section of Nephrology, Fatih University Faculty of Medicine, Ankara, Turkey.
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Al-Hilali N, Al-Humoud H, Ninan VT, Nampoory MR, Johny KV. Blood pressure control in haemodialysis patients: an audit. Nephrology (Carlton) 2006; 11:100-4. [PMID: 16669969 DOI: 10.1111/j.1440-1797.2006.00549.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVE This audit was conducted to study the level of achievement of some criteria relevant to blood pressure control in haemodialysis patients and to evaluate if auditing process improves the quality of medical care given to these patients. METHODS The records of all 105 patients on maintenance haemodialysis were included in the study. Five criteria relevant to blood pressure control were selected for auditing. The criteria were: predialysis blood pressure control <140/80, dry weight, dialysis adequacy, salt and water intake restriction, and patient education. The auditing process was conducted at two different times 6 months apart. RESULTS The first data collected in the auditing process showed that there were only 40 patients (38%) with controlled predialysis blood pressure. In the second data collection the number of patients with controlled predialysis blood pressure had risen significantly to 78 (74.3%), P < 0.0001. The same improvement was achieved for dry weight 39 (37%) to 73 (69.5%) P < 0.0001, dialysis adequacy 38 (36.2%) to 75 (71.4%) P = 0.043, salt and water intake restriction 39 (37%) to 71 (67.6%) P = 0.045, and patient education 30 (28.6%) to 55 (52.4%) P < 0.0001. CONCLUSION Setting up audit cycles to evaluate achievement of required standard in relevant criteria contribute to better blood pressure control and leads to improvement in the care of patients on dialysis. Auditing can be an essential tool in identification of poorly controlled blood pressure, its cause and is useful in control of hypertension in the haemodialysis population.
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Abstract
Insulin resistance (IR) is associated with multiple risk factors for cardiovascular disease. Many studies have shown that IR is present in chronic renal failure (CRF), and recent evidence suggests that IR can also occur in the early stages of renal disease. Patients with diabetic nephropathy (DN) have an increase in cardiovascular mortality, and since IR may be a contributing factor, this emphasizes the importance of a detailed understanding of the mechanisms linking IR and renal dysfunction at different stages of DN. IR can be detected early on in DN, e.g. at the stage of microalbuminuria (MA) and this could indicate a common genetic trait for IR and DN. As DN progresses further, IR is aggravated and it may, in addition to other factors, possibly accelerate the decline in renal function toward end-stage renal disease (ESRD). Several potentially modifiable mechanisms including circulating hormones, neuroendocrine pathways and chronic inflammation, are said to contribute to the worsening of IR. In ESRD, uremic toxins are of major importance. In this review article, we address the association between different stages of DN and IR and attempt to summarize major findings on potential mechanisms linking DN and IR. We conclude that IR is a consequence, and potentially also a cause of DN. In addition, there are probably genetic and environmental background factors that predispose to both IR and DN.
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Affiliation(s)
- Maria Svensson
- Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden.
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Saleh F, Jorde R, Svartberg J, Sundsfjord J. The relationship between blood pressure and serum parathyroid hormone with special reference to urinary calcium excretion: the Tromsø study. J Endocrinol Invest 2006; 29:214-20. [PMID: 16682833 DOI: 10.1007/bf03345542] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The aim of the present cross-sectional epidemiological study from Tromsø, Northern Norway, was to evaluate the relation between blood pressure and serum PTH, and to examine whether this relation can be explained by a blood pressure-induced increase in urinary calcium. Ten thousand-four hundred and nineteen subjects were invited to participate and 8,128 attended. Those with serum calcium outside the reference range (2.20-2.60 mmol/l), with increased serum creatinine (upper limit 120 micromol/l for men and 100 micromol/l for women) and those using antihypertensive medication were excluded. Three thousand- six hundred and twenty subjects had complete data on outcome measures. Height, weight, blood pressure, serum calcium, PTH, and creatinine were measured and smoking status recorded. A morning urine sample was collected and urinary calcium, sodium and creatinine measured. The urinary calcium/urinary creatinine ratio (Uca/Ucr) and urinary sodium/urinary creatinine ratio (Una/Ucr) were calculated. There was a significant association between both systolic and diastolic blood pressure and serum PTH. The Uca/Ucr increased with increasing blood pressure. However, the Uca/Ucr did not affect the association between blood pressure and serum PTH in a multiple linear regression model. The relationship between blood pressure and serum PTH was also seen in subjects with similar Uca/Ucr, and a negative association between serum PTH and the Uca/Ucr was found. In conclusion, blood pressure and serum PTH are associated. This association cannot be explained by the urinary calcium excretion alone.
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Affiliation(s)
- F Saleh
- Department of Internal Medicine B, University Hospital of North Norway, 9038 Tromsø, Norway.
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Odenwald T, Nakagawa K, Hadtstein C, Roesch F, Gohlke P, Ritz E, Schaefer F, Schmitt CP. Acute Blood Pressure Effects and Chronic Hypotensive Action of Calcimimetics in Uremic Rats. J Am Soc Nephrol 2006; 17:655-62. [PMID: 16421225 DOI: 10.1681/asn.2005090914] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
A previous study in subtotally nephrectomized (SNX) rats suggested beneficial effects of the calcimimetic R-568 beyond the control of mineral metabolism. This study analyzed potential blood pressure (BP)-lowering effects of R-568. Male Sprague-Dawley rats received two-stage subtotal nephrectomy or sham operation. Telemetry devices were inserted into the abdominal aorta, and BP was measured every 5 min. R-568 (20 mg/kg per d) or solvent was infused for 4 wk followed by once-daily subcutaneous injections for 2 wk. Total body sodium was measured by neutron activation analysis. The uremia-induced increase of mean arterial pressure from baseline to day 42 in SNX solvent rats (103+/-5 to 128+/-14 mmHg, P=0.006) was attenuated by R-568 (104+/-5 to 111+/-8 mmHg; P<0.0001 for difference of slopes). The circadian rhythm was abrogated in SNX rats and not restored by R-568. In sham-operated rats, R-568 had only a minor transient antihypertensive effect. R-568 injection induced a transient rise of mean arterial pressure by 23+/-4 and 26+/-10 mmHg in sham and SNX rats but only by 9+/-3 and 10+/-5 mmHg in solvent-treated rats (P<0.01 versus baseline and solvent versus R-568). Plasma angiotensin-converting enzyme activity and aldosterone levels were similar; food intake and physical activity did not differ throughout the study. In healthy rats, total body sodium was higher after 14 d of R-568 compared with solvent infusion (37.1+/-4 versus 32.5+/-1.4 mmol/kg; P=0.01). The calcimimetic R-568 causes an initial BP increase in sham-operated and uremic rats, which in uremic rats is followed by a marked and sustained antihypertensive effect.
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Nagano N. Pharmacological and clinical properties of calcimimetics: calcium receptor activators that afford an innovative approach to controlling hyperparathyroidism. Pharmacol Ther 2005; 109:339-65. [PMID: 16102839 DOI: 10.1016/j.pharmthera.2005.06.019] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2005] [Accepted: 06/29/2005] [Indexed: 12/28/2022]
Abstract
Circulating levels of calcium ion (Ca2+) are maintained within a narrow physiological range mainly by the action of parathyroid hormone (PTH) secreted from parathyroid gland (PTG) cells. PTG cells can sense small fluctuations in plasma Ca2+ levels by virtue of a cell surface Ca2+ receptor (CaR) that belongs to the superfamily of G protein-coupled receptors (GPCR). Compounds that activate the CaR and inhibit PTH secretion are termed 'calcimimetics' because they mimic or potentiate the effects of extracellular Ca2+ on PTG cell function. Preclinical studies with NPS R-568, a first generation calcimimetic compound that acts as a positive allosteric modulator of the CaR, have demonstrated that oral administration decreases serum levels of PTH and calcium, with a leftward shift in the set-point for calcium-regulated PTH secretion in normal rats. NPS R-568 also suppresses the elevation of serum PTH levels and PTG hyperplasia and can improve bone mineral density (BMD) and strength in rats with chronic renal insufficiency (CRI). Clinical trials with cinacalcet hydrochloride (cinacalcet), a compound with an improved metabolic profile, have shown that long-term treatment continues to suppress the elevation of serum levels of calcium and PTH in patients with primary hyperparathyroidism (1HPT). Furthermore, clinical trials in patients with uncontrolled secondary hyperparathyroidism (2HPT) have demonstrated that cinacalcet not only lowers serum PTH levels, but also the serum phosphorus and calcium x phosphorus product; these are a hallmark of an increased risk of cardiovascular disease and mortality in dialysis patients with end-stage renal disease. Indeed, cinacalcet has already been approved for marketing in several countries. Calcimimetic compounds like cinacalcet have great potential as an innovative medical approach to manage 1HPT and 2HPT.
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Affiliation(s)
- Nobuo Nagano
- Pharmaceutical Development Laboratories, Kirin Brewery Company, Limited, Takasaki, Gunma, Japan.
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