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Hokke S, Arias N, Armitage JA, Puelles VG, Fong K, Geraci S, Gretz N, Bertram JF, Cullen-McEwen LA. Maternal glucose intolerance reduces offspring nephron endowment and increases glomerular volume in adult offspring. Diabetes Metab Res Rev 2016; 32:816-826. [PMID: 27037899 DOI: 10.1002/dmrr.2805] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 03/09/2016] [Accepted: 03/25/2016] [Indexed: 12/16/2022]
Abstract
BACKGROUND Animal studies report a nephron deficit in offspring exposed to maternal diabetes, yet are limited to models of severe hyperglycaemia which do not reflect the typical clinical condition and which are associated with foetal growth restriction that may confound nephron endowment. We aimed to assess renal morphology and function in offspring of leptin receptor deficient mice (Leprdb /+) and hypothesized that exposure to impaired maternal glucose tolerance (IGT) would be detrimental to the developing kidney. METHODS Nephron endowment was assessed in offspring of C57BKS/J Leprdb /+ and +/+ mice at embryonic day (E)18 and postnatal day (PN)21 using design-based stereology. Transcutaneous measurement of renal function and total glomerular volume were assessed in 6-month-old offspring. Only +/+ offspring of Leprdb /+ dams were analysed. RESULTS Compared with +/+ dams, Leprdb /+ dams had a 20% and 35% decrease in glucose tolerance prior to pregnancy and at E17.5 respectively. Offspring of IGT Leprdb /+ dams had approximately 15% fewer nephrons at E18.5 and PN21 than offspring of +/+ dams. There was no difference in offspring bodyweight. Despite normal renal function, total glomerular volume was 13% greater in 6-month-old offspring of IGT Leprdb /+ dams than in +/+ offspring. CONCLUSIONS IGT throughout gestation resulted in a nephron deficit that was established early in renal development. Maternal IGT was associated with glomerular hypertrophy in adult offspring, likely a compensatory response to maintain normal renal function. Given the increasing prevalence of IGT, monitoring glucose from early in gestation may be important to prevent altered kidney morphology. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Stacey Hokke
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia
| | - Nicole Arias
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia
| | - James A Armitage
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia
- School of Medicine (Optometry), Deakin University, Waurn Ponds, VIC, Australia
| | - Victor G Puelles
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia
| | - Karen Fong
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia
| | - Stefania Geraci
- Medical Research Center, University of Heidelberg, Mannheim, Germany
| | - Norbert Gretz
- Medical Research Center, University of Heidelberg, Mannheim, Germany
| | - John F Bertram
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia
| | - Luise A Cullen-McEwen
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia.
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Hokke S, Puelles VG, Armitage JA, Fong K, Bertram JF, Cullen-McEwen LA. Maternal Fat Feeding Augments Offspring Nephron Endowment in Mice. PLoS One 2016; 11:e0161578. [PMID: 27547968 PMCID: PMC4993378 DOI: 10.1371/journal.pone.0161578] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Accepted: 06/23/2016] [Indexed: 12/18/2022] Open
Abstract
Increasing consumption of a high fat 'Western' diet has led to a growing number of pregnancies complicated by maternal obesity. Maternal overnutrition and obesity have health implications for offspring, yet little is known about their effects on offspring kidney development and renal function. Female C57Bl6 mice were fed a high fat diet (HFD, 21% fat) or matched normal fat diet (NFD, 6% fat) for 6 weeks prior to pregnancy and throughout gestation and lactation. HFD dams were overweight and glucose intolerant prior to mating but not in late gestation. Offspring of NFD and HFD dams had similar body weights at embryonic day (E)15.5, E18.5 and at postnatal day (PN)21. HFD offspring had normal ureteric tree development and nephron number at E15.5. However, using unbiased stereology, kidneys of HFD offspring were found to have 20-25% more nephrons than offspring of NFD dams at E18.5 and PN21. Offspring of HFD dams with body weight and glucose profiles similar to NFD dams prior to pregnancy also had an elevated nephron endowment. At 9 months of age, adult offspring of HFD dams displayed mild fasting hyperglycaemia but similar body weights to NFD offspring. Renal function and morphology, measured by transcutaneous clearance of FITC-sinistrin and stereology respectively, were normal. This study demonstrates that maternal fat feeding augments offspring nephron endowment with no long-term consequences for offspring renal health. Future studies assessing the effects of a chronic stressor on adult mice with augmented nephron number are warranted, as are studies investigating the molecular mechanisms that result in high nephron endowment.
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Affiliation(s)
- Stacey Hokke
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Melbourne, Victoria, Australia
| | - Victor G. Puelles
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Melbourne, Victoria, Australia
| | - James A. Armitage
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Melbourne, Victoria, Australia
- School of Medicine (Optometry), Deakin University, Waurn Ponds, Victoria, Australia
| | - Karen Fong
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Melbourne, Victoria, Australia
| | - John F. Bertram
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Melbourne, Victoria, Australia
| | - Luise A. Cullen-McEwen
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Melbourne, Victoria, Australia
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Schlote J, Schröder A, Dahlmann A, Karpe B, Cordasic N, Daniel C, Hilgers KF, Titze J, Amann K, Benz K. Cardiovascular and renal effects of high salt diet in GDNF+/- mice with low nephron number. Kidney Blood Press Res 2013; 37:379-91. [PMID: 24247178 DOI: 10.1159/000355716] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/07/2013] [Indexed: 11/19/2022] Open
Abstract
AIMS To test the suggested association of low nephron number and later development of renal and cardiovascular disease we investigated the effects of high sodium diet in heterozygous GDNF+/- mice. METHODS Aged wild type and GDNF+/- mice were grouped together according to high sodium (HS, 4%) or low sodium (LS, 0.03%) diet for 4 weeks. The heart, the aorta and the kidneys were processed for morphometric and stereological evaluations and TaqMan PCR. RESULTS On HS GDNF+/- mice showed significantly higher drinking volume and urine production than wt and mean arterial blood pressure tended to be higher. Heart weight was higher in GDNF+/- than in wt, but the difference was only significant for LS. HS significantly increased cardiac interstitial tissue in GDNF+/-, but not in wt. On LS GDNF+/- mice had significantly larger glomeruli than wt and HS led to an additional two fold increase of glomerular area compared to LS. On electron microscopy glomerular damage after HS was seen in GDNF+/-, but not in wt. Dietary salt intake modulated renal IL-10 gene expression in GDNF+/-. CONCLUSION In the setting of 30% lower nephron number HS diet favoured maladaptive changes of the kidney as well as of the cardiovascular system.
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Affiliation(s)
- Julia Schlote
- Department of Pathology, IZKF Nachwuchsgruppe, Department of Nephrology and Hypertension, Department of Pediatrics, University of Erlangen-Nürnberg, Germany
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Gurusinghe S, Brown RD, Cai X, Samuel CS, Ricardo SD, Thomas MC, Kett MM. Does a nephron deficit exacerbate the renal and cardiovascular effects of obesity? PLoS One 2013; 8:e73095. [PMID: 24019901 PMCID: PMC3760915 DOI: 10.1371/journal.pone.0073095] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Accepted: 07/19/2013] [Indexed: 12/30/2022] Open
Abstract
It has been hypothesized that a reduced nephron endowment exacerbates the hypertensive and renal effects of obesity. We therefore examined the impact of diet-induced obesity on renal structure and function, and arterial pressure in a genetic model of reduced nephron endowment, the GDNF Heterozygous (HET) mouse. 6wk-old male GDNF WT and HET mice were placed on control or high fat (HFF) diet for 20 weeks. 24 hr arterial pressure, heart rate and activity (radiotelemetry), creatinine clearance and albumin excretion were measured, and kidneys collected (histopathology, collagen content). Bodyweights of HFF WT (50.6±1.2 g) and HET (48.8±1.4 g) mice were ∼14 g greater than control mice (37.3±1.3 g, 36.4±1.1 g respectively; Pdiet<0.001). Obesity led to significantly greater 24 hr MAP (Pdiet<0.001), heart rate (Pdiet<0.01) and lower locomotor activity (Pdiet<0.01) in HET and WT mice. Whilst there was no significant impact of genotype on 24 hr MAP response to obesity, night-time MAP of obese HET mice was significantly greater than obese WT mice (122.3±1.6 vs 116.9±1.3 mmHg; P<0.05). 24 hr creatinine clearance was 50%, and albumin excretion 180% greater in obese WT and HET mice compared to controls (Pdiet<0.05) but this response did not differ between genotypes. Obesity induced glomerulomegaly, glomerulosclerosis, tubulointerstitial expansion and increased collagen accumulation (total, collagen I, V and IV; Pdiet<0.001). Obese GDNF HET mice had exacerbated total renal collagen (P<0.01), and greater levels of the collagen I subtype compared to kidneys of obese WT mice. In summary, obese nephron-deficient GDNF HET mice were able to maintain the high creatinine clearances of obese WT mice but at the expense of higher MAP and greater renal fibrosis. Whilst modest, our findings support the hypothesis that a reduced nephron endowment increases the susceptibility to obesity-induced kidney disease and hypertension.
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Affiliation(s)
- Seshini Gurusinghe
- Department of Physiology, Monash University, Clayton, Victoria, Australia
| | - Russell D. Brown
- Department of Physiology, Monash University, Clayton, Victoria, Australia
| | - Xiaochu Cai
- Department of Physiology, Monash University, Clayton, Victoria, Australia
| | - Chrishan S. Samuel
- Department of Pharmacology, Clayton, Victoria, Australia
- Howard Florey Institute, University of Melbourne, Parkville, Victoria, Australia
- Department of Biochemistry and Molecular Biology, University of Melbourne, Parkville, Victoria, Australia
| | - Sharon D. Ricardo
- Department of Anatomy and Cell Biology, Monash University, Clayton, Victoria, Australia
| | - Merlin C. Thomas
- Baker IDI Heart and Diabetes Institute, Prahran, Victoria, Australia
| | - Michelle M. Kett
- Department of Anatomy and Cell Biology, Monash University, Clayton, Victoria, Australia
- * E-mail:
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Cullen-McEwen LA, Douglas-Denton RN, Bertram JF. Estimating total nephron number in the adult kidney using the physical disector/fractionator combination. Methods Mol Biol 2012; 886:333-50. [PMID: 22639275 DOI: 10.1007/978-1-61779-851-1_30] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Nephron number has emerged as a useful parameter for assessing the roles of specific genes and feto-maternal environmental factors in kidney development. Nephron number is also of clinical interest due to increasing evidence suggesting that low nephron number is associated with increased risk for developing chronic adult disease, including cardiovascular and renal disease. The physical disector/fractionator combination is considered the gold standard method for estimating total nephron number in kidneys. Here we describe the use of this method to estimate total nephron number in mouse and rat kidneys, and variations to the method required to estimate nephron number in larger species, including human.
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Affiliation(s)
- Luise A Cullen-McEwen
- Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia
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Moritz KM, De Matteo R, Dodic M, Jefferies AJ, Arena D, Wintour EM, Probyn ME, Bertram JF, Singh RR, Zanini S, Evans RG. Prenatal glucocorticoid exposure in the sheep alters renal development in utero: implications for adult renal function and blood pressure control. Am J Physiol Regul Integr Comp Physiol 2011; 301:R500-9. [DOI: 10.1152/ajpregu.00818.2010] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Treatment of the pregnant ewe with glucocorticoids early in pregnancy results in offspring with hypertension. This study examined whether glucocorticoids can reduce nephron formation or alter gene expression for sodium channels in the late gestation fetus. Sodium channel expression was also examined in 2-mo-old lambs, while arterial pressure and renal function was examined in adult female offspring before and during 6 wk of increased dietary salt intake. Pregnant ewes were treated with saline (SAL), dexamethasone (DEX; 0.48 mg/h) or cortisol (CORT; 5 mg/h) over days 26–28 of gestation (term = 150 days). At 140 days of gestation, glomerular number in CORT and DEX animals was 40 and 25% less, respectively, compared with SAL controls. Real-time PCR showed greater gene expression for the epithelial sodium channel (α-, β-, γ-subunits) and Na+-K+-ATPase (α-, β-, γ-subunits) in both the DEX and CORT group fetal kidneys compared with the SAL group with some of these changes persisting in 2-mo-old female offspring. In adulthood, sheep treated with dexamethasone or cortisol in utero had elevated arterial pressure and an apparent increase in single nephron glomerular filtration rate, but global renal hemodynamics and excretory function were normal and arterial pressure was not salt sensitive. Our findings show that the nephron-deficit in sheep exposed to glucocorticoids in utero is acquired before birth, so it is a potential cause, rather than a consequence, of their elevated arterial pressure in adulthood. Upregulation of sodium channels in these animals could provide a mechanistic link to sustained increases in arterial pressure in cortisol- and dexamethasone-exposed sheep, since it would be expected to promote salt and water retention during the postnatal period.
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Affiliation(s)
- Karen M. Moritz
- Department of Anatomy and Developmental Biology and
- School of Biomedical Sciences, University of Queensland, St. Lucia, Australia
| | - Robert De Matteo
- Department of Anatomy and Developmental Biology and
- Department of Physiology, Monash University, Clayton, Australia; and
| | - Miodrag Dodic
- Department of Physiology, Monash University, Clayton, Australia; and
| | | | - Debbie Arena
- Department of Anatomy and Developmental Biology and
| | - E. Marelyn Wintour
- Department of Anatomy and Developmental Biology and
- Department of Physiology, Monash University, Clayton, Australia; and
| | - Megan E. Probyn
- School of Biomedical Sciences, University of Queensland, St. Lucia, Australia
| | | | | | - Simone Zanini
- School of Biomedical Sciences, University of Queensland, St. Lucia, Australia
| | - Roger G. Evans
- Department of Physiology, Monash University, Clayton, Australia; and
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Benz K, Campean V, Cordasic N, Karpe B, Neuhuber W, Mall G, Hartner A, Hilgers KF, Amann K. Early glomerular alterations in genetically determined low nephron number. Am J Physiol Renal Physiol 2011; 300:F521-30. [DOI: 10.1152/ajprenal.00490.2009] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
An association between low nephron number and subsequent development of hypertension in later life has been demonstrated. The underlying pathomechanisms are unknown, but glomerular and postglomerular changes have been discussed. We investigated whether such changes are already present in prehypertensive “glial cell line-derived neurotrophic growth factor” heterozygous mice (GDNF+/−) with lower nephron number. Twenty-six-week-old mice [22 GDNF+/−, 29 C57B6 wild-type control (wt)] were used for in vivo experiments with intra-arterial and tail cuff blood pressure measurements. After perfusion fixation, kidneys were investigated with morphological, morphometric, stereological, and immunohistochemical techniques and TaqMan PCR analysis. As expected at this age, blood pressure was comparable between GDNF+/− and wt. Nephron number per kidney was significantly lower in GDNF+/− than in wt (−32.8%, P < 0.005), and mean glomerular volume was significantly higher (+49.5%, P < 0.001). Renal damage scores, glomerular and tubular proliferation, analysis of intrarenal arteries and peritubular capillaries, expression of relevant tubular transporter proteins, as well as gene expression of profibrotic, proinflammatory, or prohypertensive markers were not significantly different between GDNF+/− and wt. Compensatory glomerular hypertrophy in GDNF+/− was accompanied by higher numbers of endothelial and mesangial cells as well as PCNA-positive glomerular cells, whereas podocyte density was significantly reduced. Further electron microscopic analysis showed marked thickening of glomerular basement membrane. In conclusion, lower nephron number is associated with marked early glomerular structural changes, in particular lower capillary supply, reduced podocyte density, and thickened glomerular basement membrane, that may predispose to glomerular sclerosis.
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Affiliation(s)
| | | | | | | | | | - Gerhard Mall
- Department of Pathology, Hospital of Darmstadt, Darmstadt, Germany
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Abstract
Development of the kidney can be altered in utero in response to a suboptimal environment. The intrarenal factors that have been most well characterized as being sensitive to programming events are kidney mass/nephron endowment, the renin-angiotensin system, tubular sodium handling, and the renal sympathetic nerves. Newborns that have been subjected to an adverse intrauterine environment may thus begin life at a distinct disadvantage, in terms of renal function, at a time when the kidney must take over the primary role for extracellular fluid homeostasis from the placenta. A poor beginning, causing renal programming, has been linked to increased risk of hypertension and renal disease in adulthood. However, although a cause for concern, increasingly, evidence demonstrates that renal programming is not a fait accompli in terms of future cardiovascular and renal disease. A greater understanding of postnatal renal maturation and the impact of secondary factors (genes, sex, diet, stress, and disease) on this process is required to predict which babies are at risk of increased cardiovascular and renal disease as adults and to be able to devise preventative measures.
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Affiliation(s)
- Michelle M Kett
- Department of Physiology, Monash University, Clayton, Victoria, Australia
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Ruta LAM, Dickinson H, Thomas MC, Denton KM, Anderson WP, Kett MM. High-salt diet reveals the hypertensive and renal effects of reduced nephron endowment. Am J Physiol Renal Physiol 2010; 298:F1384-92. [PMID: 20335316 DOI: 10.1152/ajprenal.00049.2010] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
The extent to which a reduced nephron endowment contributes to hypertension and renal disease is confounded in models created by intrauterine insults that also demonstrate other phenotypes. Furthermore, recent data suggest that a reduced nephron endowment provides the "first hit" and simply increases the susceptibility to injurious stimuli. Thus we examined nephron number, glomerular volume, conscious mean arterial pressure (MAP), and renal function in a genetic model of reduced nephron endowment before and after a high-salt (5%) diet. One-yr-old glial cell line-derived neurotrophic factor wild-type (WT) mice, heterozygous (HET) mice born with two kidneys (HET2K), and HET mice born with one kidney (HET1K) were used. Nephron number was 25% lower in HET2K and 65% lower in HET1K than WT mice. Glomeruli hypertrophied in both HET groups by 33%, resulting in total glomerular volumes that were similar between HET2K and WT mice but remained 50% lower in HET1K mice. On a normal-salt diet, 24-h MAP was not different between WT, HET2K, and HET1K mice (102 +/- 1, 103 +/- 1, and 102 +/- 2 mmHg). On a high-salt diet, MAP increased 9.1 +/- 1.9 mmHg in HET1K mice (P < 0.05) and 5.4 +/- 0.9 mmHg in HET2K mice (P < 0.05) and did not change significantly in WT mice. Creatinine clearance was 60% higher in WT mice but 30% lower in HET2K and HET1K mice fed a high-salt diet than in controls maintained on a normal-salt diet. Thus a reduction in nephron number (or total glomerular volume) alone does not lead to hypertension or kidney disease in aged mice, but exposure to high salt uncovers a hypertensive and renal phenotype.
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Affiliation(s)
- Leah-Anne M Ruta
- Department of Physiology, Monash University, Clayton, Victoria, Australia
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Thrift AG, Srikanth V, Fitzgerald SM, Kalyanram K, Kartik K, Hoppe CC, Walker KZ, Evans RG. Potential roles of high salt intake and maternal malnutrition in the development of hypertension in disadvantaged populations. Clin Exp Pharmacol Physiol 2009; 37:e78-90. [PMID: 19650789 DOI: 10.1111/j.1440-1681.2009.05266.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
1. It has been argued that all major risk factors for cardiovascular disease have been identified. Yet, epidemiological studies undertaken to identify risk factors have largely focused on populations in developed nations or on the urban or relatively affluent rural populations of developing countries. Poor rural populations are seldom studied. 2. Somewhat different risk factors may operate in poor rural populations. Evidence for this is provided by the finding that, in disadvantaged rural India, the prevalence of hypertension is greater than would be expected based on established risk factors in these populations. One risk factor to be considered is a poor intrauterine environment. 3. In animals, maternal macro- and micronutrient malnutrition can lead to reduced nephron endowment. Nephron deficiency, in turn, can render blood pressure salt sensitive. The combination of nephron deficiency and excessive salt intake will predispose to hypertension. 4. Human malnutrition may have similar effects, particularly in regions of the world where malnutrition is endemic and where women are disadvantaged by existing social practices. 5. Moreover, high salt intake is endemic in many parts of Asia, including India. Therefore, we propose that maternal malnutrition (leading to reduced nephron endowment), when combined with excessive salt intake postnatally, will account, at least in part, for the unexpectedly high prevalence of hypertension in disadvantaged rural communities in India and elsewhere.
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Affiliation(s)
- Amanda G Thrift
- Department of Epidemiology and Preventive Medicine, Baker IDI Heart and Diabetes Institute, Monash University, Melbourne, Victoria, Australia.
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