Navigation Links
A mother's salt intake could be key to prenatal kidney development
Date:7/6/2011

Bethesda, Md. (July 6, 2011) A new animal study from Europe has drawn an association between pregnant mothers' sodium intake and their newborn's kidney development. Among the most significant aspects of the study's findings is that either too much or too little salt during pregnancy had an adverse effect on the prenatal development of the offspring's kidneys. The consequence of such disruption can lead to high blood pressure in later years.

These are the conclusions reached in the study, "Both High and Low Maternal Salt Intake in Pregnancy Alters Kidney Development in the Offspring," conducted by Nadezda Koleganova, Grzegorz Piecha, Annett Mller, Monika Weckbach, Peter Schirmacher, and Marie-Luise Gross-Weissmann, Eberhard Ritz and Luis Eduardo Becker, all with the University of Heidelberg in Heidelberg, DE; and Jens Randel Nyengaard of the University of Aarhus, Aarhus, DK. Their study is published in the online edition of the American Journal of Physiology--Renal Physiology.

Background

This research builds upon past studies that recognize that excessive salt intake causes secretion of endogenous cardiotonic steroids such as marinobufagenin (MBG). For the pregnant female, this can be harmful since high concentrations of MBG are correlated to low birth-weight and higher blood pressure in the offspring.

Previous research has also linked high blood pressure with a low nephron number, critical because the nephron is the basic structural and functional unit of the kidney. The nephron eliminates wastes from the body, regulates blood volume and blood pressure, controls levels of electrolytes and metabolites, and regulates blood pH. Its functions are vital to life and are regulated by the endocrine system.

Methodology

Sprague-Dawley rats were fed low, intermediate or high sodium diets during pregnancy and lactation. The litters were standardized to identical size at birth with 1:1 male to female ratio. The offspring were separated from their mothers at four weeks of age and subsequently received the intermediate sodium diet. The animals had free access to water and food and their body weight, food and water consumption were monitored weekly.

The kidney structure was assessed at postnatal weeks 1 and 12, and the expression of proteins known to be involved in kidney development were examined at birth and 1 week of age. Blood pressure was measured by telemetry in male offspring between the ages of two and nine months.

Results

The researchers found that the number of glomeruli (the main structural unit of the kidney) during weeks 1-12 were significantly lower, and the measured blood pressure for males after the fifth month was higher in offspring of mothers on high- or low- compared with intermediate-sodium diet. High salt diet was paralleled by higher concentrations of marinobufagenin in the amniotic fluid and an increase in the expression of both GDNF and its inhibitor, sprouty-1 in the offspring's kidney. The expression of FGF-10, a genetic signal responsible for kidney development, was lower in offspring of mothers on low-sodium diet and the expression of Pax-2 and FGF-2, tissue-specific genes that determine cell lineages, tissue patterning, and cellular proliferation was lower in offspring of mothers on high-sodium diet.

Importance of the Findings

Taken together the above findings indicate that both too low and too high maternal salt intakes retard development of new glomeruli, resulting in a nephron deficit. If the findings in the animals in this study can be extrapolated to humans, both too low and too high salt intake during pregnancy would be a risk factor for hypertension and renal damage in the offspring.

In women, each mother-to-be has specific health issues and conditions that require guidance from a health provider. This study sheds light on the issue of salt intake during pregnancy and draws attention to the possible consequences of consuming too much or too little salt during pregnancy and the impact it may have on the kidney development of an offspring.


'/>"/>

Contact: Donna Krupa
dkrupa@the-aps.org
703-634-7209
American Physiological Society
Source:Eurekalert

Related biology news :

1. New mothers can learn a lot from watching their babies
2. Parenting stress affects new mothers’ postpartum lifestyle
3. Preterm mothers milk contains less antioxidants than mothers completing their gestation
4. Mothers diets have biggest influence on children eating healthy
5. New report suggests why risk for sudden infant death syndrome is greater in babies of mothers who smoke
6. Successful mothers get help from their friends: Dolphin study
7. Discus fish parent young like mammalian mothers
8. Black mothers cite lack of desire as top reasons for not breastfeeding
9. About 94 percent of breastfeeding mothers do not follow a proper diet
10. Giving DHA supplements to breastfeeding mothers
11. HPV vaccination more likely if mothers approve
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/28/2016)... Sweden , April 28, 2016 First ... M (139.9), up 966% compared with the first quarter of 2015 ... profit totaled SEK 589.1 M (loss: 18.8) and the operating margin ... 7.12 (loss: 0.32) Cash flow from operations was SEK ... The 2016 revenue guidance is unchanged, SEK 7,000-8,500 M. ...
(Date:4/15/2016)... -- Research and Markets has announced the ...  report to their offering.  ,      ... gait biometrics market is expected to grow at ... Gait analysis generates multiple variables such ... compute factors that are not or cannot be ...
(Date:3/29/2016)... RATON, Florida , March 29, 2016 ... or the "Company") LegacyXChange "LEGX" and SelectaDNA/CSI Protect are ... DNA in ink used in a variety of writing ... theft. Buyers of originally created collectibles from athletes on ... through forensic analysis of the DNA. ...
Breaking Biology News(10 mins):
(Date:4/27/2016)... MD (PRWEB) , ... April 27, 2016 , ... ... Greg Lamka, PhD to its Scientific Advisory Board. Dr. Lamka will assist PathSensors ... plant pathogen detection. , PathSensors deploys the CANARY® test platform for the ...
(Date:4/27/2016)... PARIS , April 27, 2016 ... system disorders, today announces the appointment of Catherine Moukheibir as ... succeed MedDay,s previous Chairman, Jean Jacques Garaud , who ... The change is effective immediately. Catherine started her ... Boston and London .  She ...
(Date:4/26/2016)... ... April 26, 2016 , ... The European Patent Office (EPO) today ... three finalists for the European Inventor Award 2016 in the category "Non-European countries." The ... at a ceremony in Lisbon on June 9th. , The human capacity to walk ...
(Date:4/26/2016)... ... April 26, 2016 , ... BioFactura, Inc ., a ... round of financing. Healthy investor interest drove significant oversubscription of the original $1.5M ... known as biosimilars, to the advanced preclinical stages. , Chief Executive Officer and President, ...
Breaking Biology Technology: