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Clark JL, Rech L, Chaity N, Sihag J, Taylor CG, Aliani M. Possible deleterious hormonal changes associated with low-sodium diets. Nutr Rev 2015; 73:22-35. [PMID: 26024055 DOI: 10.1093/nutrit/nuu003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The average salt intake of people in Canada, the United States, and Europe is about 3,400 mg of sodium per day, which exceeds the recommended intake levels set by various health organizations. The World Health Organization recommends a worldwide reduction of sodium intake to less than 2,000 mg per day. Most research to date has focused on the negative effects of high-sodium intake; however, little information is available on the metabolic effects of low-sodium intakes. This review focuses on the hormonal changes associated with low-sodium diets, especially the hormones involved in metabolism and cardiovascular and renal function. Based largely on rodent studies, low-sodium diets have been associated with changes in glycemic control, energy metabolism, cardiovascular disease risk, cholesterol concentrations, inflammation, and functioning of the renin-angiotensin-aldosterone system. Overall, research has revealed mixed results regarding the impact of dietary sodium intake on various hormones. Further research is required to assess the effects of sodium reduction on hormones and their associated pathways in order to determine the likelihood of any unintended effects.
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Affiliation(s)
- Jaime L Clark
- J.L. Clark, L. Rech, N. Chaity, J. Sihag, C.G. Taylor, and M. Aliani are with the Department of Human Nutritional Sciences, University of Manitoba, Winnipeg, Manitoba, Canada. J.L. Clark, L. Rech, C.G. Taylor, and M. Aliani are with the Canadian Centre for Agri-Food Research in Health and Medicine, St Boniface Research Centre, Winnipeg, Manitoba, Canada. C.G. Taylor is with the Department of Physiology, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Leslie Rech
- J.L. Clark, L. Rech, N. Chaity, J. Sihag, C.G. Taylor, and M. Aliani are with the Department of Human Nutritional Sciences, University of Manitoba, Winnipeg, Manitoba, Canada. J.L. Clark, L. Rech, C.G. Taylor, and M. Aliani are with the Canadian Centre for Agri-Food Research in Health and Medicine, St Boniface Research Centre, Winnipeg, Manitoba, Canada. C.G. Taylor is with the Department of Physiology, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Nazia Chaity
- J.L. Clark, L. Rech, N. Chaity, J. Sihag, C.G. Taylor, and M. Aliani are with the Department of Human Nutritional Sciences, University of Manitoba, Winnipeg, Manitoba, Canada. J.L. Clark, L. Rech, C.G. Taylor, and M. Aliani are with the Canadian Centre for Agri-Food Research in Health and Medicine, St Boniface Research Centre, Winnipeg, Manitoba, Canada. C.G. Taylor is with the Department of Physiology, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Jyoti Sihag
- J.L. Clark, L. Rech, N. Chaity, J. Sihag, C.G. Taylor, and M. Aliani are with the Department of Human Nutritional Sciences, University of Manitoba, Winnipeg, Manitoba, Canada. J.L. Clark, L. Rech, C.G. Taylor, and M. Aliani are with the Canadian Centre for Agri-Food Research in Health and Medicine, St Boniface Research Centre, Winnipeg, Manitoba, Canada. C.G. Taylor is with the Department of Physiology, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Carla G Taylor
- J.L. Clark, L. Rech, N. Chaity, J. Sihag, C.G. Taylor, and M. Aliani are with the Department of Human Nutritional Sciences, University of Manitoba, Winnipeg, Manitoba, Canada. J.L. Clark, L. Rech, C.G. Taylor, and M. Aliani are with the Canadian Centre for Agri-Food Research in Health and Medicine, St Boniface Research Centre, Winnipeg, Manitoba, Canada. C.G. Taylor is with the Department of Physiology, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Michel Aliani
- J.L. Clark, L. Rech, N. Chaity, J. Sihag, C.G. Taylor, and M. Aliani are with the Department of Human Nutritional Sciences, University of Manitoba, Winnipeg, Manitoba, Canada. J.L. Clark, L. Rech, C.G. Taylor, and M. Aliani are with the Canadian Centre for Agri-Food Research in Health and Medicine, St Boniface Research Centre, Winnipeg, Manitoba, Canada. C.G. Taylor is with the Department of Physiology, University of Manitoba, Winnipeg, Manitoba, Canada.
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Ni XP, Butler AA, Cone RD, Humphreys MH. Central receptors mediating the cardiovascular actions of melanocyte stimulating hormones. J Hypertens 2006; 24:2239-46. [PMID: 17053546 DOI: 10.1097/01.hjh.0000249702.49854.fa] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE Alpha and gamma-melanocyte stimulating hormones (MSH) are peptides that possess potent hypertensinogenic actions when injected intravenously or intracerebroventricularly. We sought to define the central receptor(s) mediating these cardiovascular actions. METHODS We gave bolus injections of synthetic alpha or gamma-MSH intravenously or intracerebroventricularly to anesthetized wild-type (Mc3r+/+, Mc4r+/+) mice and mice with targeted disruption of the gamma-MSH receptor (Mc3r-/-) or the melanocortin 4 receptor (Mc4r-/-). RESULTS Gamma-MSH injected intravenously increased mean arterial pressure (MAP) and heart rate (HR) dose-dependently, with the effect being evident at 10 mol/kg; the maximum increase, at 10 mol/kg, was 38 mmHg in both strains from similar control MAP. Parallel increases in HR also occurred. Injection of the sodium channel blocker, benzamil, 4 microg/kg intracerebroventricularly, before intravenous gamma-MSH completely prevented the increases in MAP and HR in both strains. Injection of 2 x 10 mol/g body weight alpha-MSH intravenously had no effect on MAP or HR in Mc4r wild-type or -/- mice. However, the same dose given intracerebroventricularly to wild-type mice increased MAP from 76 +/- 4 to 95 +/- 5 mmHg at 10 min (P < 0.01) and HR from 416 +/- 15 to 480 +/- 15 beats/min (P < 0.01). In Mc4r-/- mice, the intracerebroventricular administration of the peptide did not alter these variables, in contrast to the results in wild-type mice. CONCLUSION Both MSH peptides exert their hypertensinogenic effects through central sites of action, which probably reflect the activation of sympathetic outflow. The actions of intracerebroventricular alpha-MSH appear to be mediated via Mc4r, whereas those of gamma-MSH are independent of its receptor Mc3r, but reflect the activation of a sodium channel in the central nervous system. These results help to reconcile the hypertensive action of gamma-MSH injections with the hypertension observed in states of gamma-MSH deficiency.
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MESH Headings
- Amiloride/analogs & derivatives
- Amiloride/pharmacology
- Animals
- Blood Pressure/drug effects
- Blood Pressure/physiology
- Dose-Response Relationship, Drug
- Heart Rate/drug effects
- Heart Rate/physiology
- Hypertension/metabolism
- Hypertension/physiopathology
- Mice
- Mice, Knockout
- Models, Animal
- Receptor, Melanocortin, Type 3/genetics
- Receptor, Melanocortin, Type 3/physiology
- Receptor, Melanocortin, Type 4/genetics
- Receptor, Melanocortin, Type 4/physiology
- Sodium Channel Blockers/pharmacology
- Sympatholytics/pharmacology
- alpha-MSH/pharmacology
- gamma-MSH/pharmacology
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Affiliation(s)
- Xi-Ping Ni
- Division of Nephrology, San Francisco General Hospital and University of California San Francisco, San Francisco, California 94143-1341, USA
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Kishi K, Sonomura T, Fujimoto H, Kimura M, Yamada K, Sato M, Juri M. Physiologic effect of stent therapy for inferior vena cava obstruction due to malignant liver tumor. Cardiovasc Intervent Radiol 2006; 29:75-83. [PMID: 16328694 DOI: 10.1007/s00270-004-0324-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
PURPOSE To understand systemic the influence of stent therapy for inferior vena cava (IVC) obstruction due to advanced liver tumor. METHODS Seven patients with symptomatic IVC obstruction due to advanced primary (n = 4) or secondary (n = 3) liver tumor were subjected to stent therapy. Enrollment criteria included high IVC pressure over 15 mmHg and the presence of edema and ascites. Z-stents were deployed using coaxial sheath technique via femoral venous puncture. Physiologic and hematobiochemical parameters were analyzed. RESULTS All procedures were successful, and the stents remained patent until patient death. Promptly after stent placement, the IVC flow recovered, and the venous blood pressure in the IVC below the obstruction level showed a significant decrease from 20.8 +/- 1.2 mmHg (mean +/- SE) to 10.7 +/- 0.7 mmHg (p < 0.01). Transient mild increase of right atrial pressure was observed in 1 patient. During the following week prominent diuresis was observed in all patients. Mean urine output volume in the 3 days before the stent therapy was 0.81 +/- 0.09 l/day compared with 2.1 +/- 0.2 l/day (p < 0.01) in the 3 days after. The edema and ascites decreased in all patients. The caval pressure change correlated well (r > 0.6) with the urine volume increase, and with the decreased volume of edema and ascites. The urine volume increase correlated well with the decrement of edema, but not with that of ascites. Improvements for various durations in the levels of blood urea nitrogen, serum creatinine, lactate dehydrogenase, fibrinogen, and platelet count were found (p < 0.05). These hematobiochemical changes were well correlated with each other and with the decrement of ascites. Two patients showed a low blood sodium level of 128.5 mEq/l after intensive natriuresis, and one of them died on day 21 with hepatic failure, which was interpreted as maladaptation aggravation. The mean survival time was 94.1 +/- 34.1 days (mean +/- SD), ranging from 21 to 140 days after stent treatment. CONCLUSION The stent therapy for IVC obstruction due to malignant liver tumors was followed by a series of physiologic and hematobiochemical consequences, most of them favorable but some possibly unfavorable. Rational interpretations and predictions of sequelae based on physiologic science including cardiology, hepatology, and nephrology would facilitate the best management of stent therapy for malignant IVC obstruction.
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Affiliation(s)
- Kazushi Kishi
- Department of Radiology, Wakayama Medical University, Kimiidera 811-1, Wakayama City 641-0012, Japan.
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Humphreys MH. Gamma-MSH, sodium metabolism, and salt-sensitive hypertension. Am J Physiol Regul Integr Comp Physiol 2004; 286:R417-30. [PMID: 14761863 DOI: 10.1152/ajpregu.00365.2003] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Alpha-, beta-, and gamma-melanocyte stimulating hormones (MSHs) are melanotropin peptides that are derived from the ACTH/beta-endorphin prohormone proopiomelanocortin (POMC). They have been highly conserved through evolutionary development, although their functions in mammals have remained obscure. The identification in the last decade of a family of five membrane-spanning melanocortin receptors (MC-Rs), for which the melanotropins are the natural ligands, has permitted the characterization of a number of important actions of these peptides, although the physiological function(s) of gamma-MSH have remained elusive. Much evidence indicates that gamma-MSH stimulates sympathetic outflow and raises blood pressure through a central mechanism. However, this review focuses on newer cardiovascular and renal actions of the peptide, acting in most cases through the MC3-R. In rodents, a high-sodium diet (HSD) increases the pituitary abundance of POMC mRNA and of gamma-MSH content and results in a doubling of plasma gamma-MSH concentration. The peptide is natriuretic and acts through renal MC3-Rs, which are also upregulated by the HSD. Thus the system appears designed to participate in the integrated response to dietary sodium excess. Genetic or pharmacologic induction of gamma-MSH deficiency results in marked salt-sensitive hypertension that is corrected by the administration of the peptide, probably through a central site of action. Deletion of the MC3-R also produces salt-sensitive hypertension, which, however, is not corrected by infusion of the hormone. These observations in aggregate suggest the operation of a hormonal system important in blood pressure control and in the regulation of sodium excretion. The relationship of these two actions to each other and the significance of this system in humans are important questions for future research.
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Affiliation(s)
- Michael H Humphreys
- Division of Nephrology, San Francisco General Hospital, San Francisco, California 94143, USA.
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Mebazaa A, Payen D. [Atrial natriuretic factor]. ANNALES FRANCAISES D'ANESTHESIE ET DE REANIMATION 1990; 9:153-68. [PMID: 2141971 DOI: 10.1016/s0750-7658(05)80054-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Although ANF research started 30 years ago, the atrial natriuretic factor (ANF) was only discovered recently (1981). The presence of such a factor has been suspected for many years because of histological and physiological arguments. In 1956, Kish found "dense granules" in the atrial walls of guinea pigs. Gauer and Henry could explain some of their experimental results on diuresis and natriuresis only by suggesting the presence of a third hormonal factor, but neither by the renin-angiotensin system, nor the anti-diuretic hormone. Hall et al. were the first to recognize a link between the granules and water and sodium metabolism. But it was De Bold who published the crucial experiment in 1981: injecting right atrial extracts to anaesthetized rats rapidly induced intense and transitory diuresis and natriuresis. ANF was born, and, at the same time, the concept of the heart as an endocrine gland. Indeed, ANF corresponds to the strict definition of a hormone. It has the following properties: natriuresis and diuresis via an increase in glomerular filtration fraction without any major changes in renal plasma flow; direct vasodilation of the large arteries with only few effects on small arterioles and veins. The stimuli for ANF secretion are mechanical and pharmacological, especially drugs currently used by anaesthetists. Atrial distension is the main mechanical stimulus. An increase in atrial transmural pressure is always followed by a release in ANF, but this effect is not constant for increases in intra-luminal pressure. It is the former pressure gradient alone that reflects the volume of the right atrium, the mechanical stimulus for ANF secretion. Tachycardia, or, more precisely, an increase in the atrial contraction rate, also leads to an important release of ANF. Cardiac nerves are not necessary for this, as demonstrated by studies in heart transplant patients. Only few pharmacological agents have been shown to really stimulate ANF secretion. In rats, morphine has a direct secretory effect, whereas ketamine hydrochloride, diethylether and chloral hydrate do so by increasing the release of catecholamines. The effects of alpha, beta adrenergic agonists and calcium agonists remain controversial. ANF, which has diuretic and vasodilator effects, plays a part, together with the renin-angiotensin system and the anti-diuretic hormone, in blood volume control in mammals. However, it has a special role to play, because it is a rapid release hormone: rapid vascular filling leads to an increase in ANF in less than 1 minute, with a parallel increase in diuresis.
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Affiliation(s)
- A Mebazaa
- Département d'Anesthésie et de Réanimation, Hôpital Lariboisière, Paris
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