Navigation Links
LSUHSC study IDs proteins regulating water retention in salt-sensitive hypertension
Date:10/22/2010

New Orleans, LA Research conducted by scientists at LSU Health Sciences Center New Orleans has found that two proteins in the brain act as valves to turn the hormone that regulates water retention in the body on and off. Their findings may lead to advances in treatment for diseases like high blood pressure, congestive heart failure, and cirrhosis of the liver. The research is published in the November 1, 2010 issue of Endocrinology.

Daniel Kapusta, PhD, Professor of Pharmacology at LSU Health Sciences Center New Orleans, and Richard Wainford, PhD, LSUHSC Instructor of Pharmacology, report the role of these brain proteins, called Gαq and Gαz, in producing elevated secretion of the hormone, vasopressin, and water retention in salt-sensitive hypertension, a condition in which blood pressure becomes elevated when salt is consumed. It is estimated that salt-sensitive hypertension occurs in about 26% of Americans with normal blood pressure and in 58% of those whose blood pressure is already high.

"Throughout the day, vasopressin, a peptide hormone produced by the hypothalamus, is released into the circulation from the pituitary gland and plays a vital role as the flood-gate keeper to prevent excessive loss of water from the kidneys," notes Dr. Kapusta. "Under most conditions, the water-retaining action of vasopressin is vital for survival. However, it has remained essentially a black box as to why, in susceptible individuals, the regulatory mechanisms that control vasopressin secretion cannot turn off when the body already has elevated water content."

For 21-days, the research team fed groups of male salt-resistant and salt-sensitive rats a diet containing either normal or high salt. Then they measured how the treatments influenced the animal's ability to excrete water and how the salt stress altered levels of vasopressin, Gαq and Gαz.

The consumption of high salt triggered a decrease in Gαq proteins in the brain of salt-resistant, but not salt-sensitive, rats. In salt-sensitive rats, the team demonstrated that reducing brain Gαq proteins returned plasma vasopressin to normal levels, decreased salt-induced water retention, and restored the animal's ability to excrete water.

"Our findings are novel and provide evidence that the Gαq sub-unit proteins in the hypothalamus act as a molecular/cellular switch to control the level of vasopressin secretion," says Dr. Wainford.

The researchers concluded that reducing brain Gαq proteins plays a critical counter-regulatory role in preventing the secretion of too much vasopressin in those with salt-resistance and may represent a new therapeutic target in diseases associated with fluid retention.


'/>"/>

Contact: Leslie Capo
lcapo@lsuhsc.edu
504-568-4806
Louisiana State University Health Sciences Center
Source:Eurekalert

Related biology news :

1. LSUHSC awarded patent for compound inhibiting cancer and other diseases
2. LSUHSC research identifies key contributor to Alzheimers disease process
3. LSUHSC student awarded top national honor for diabetes research
4. LSUHSC public health researcher finds reason for weight gain
5. LSUHSC research describes function of key protein in cancer spread
6. LSUHSCs Kolls awarded $1.8 million to improve vaccine strategies for P. carinii pneumonia
7. LSUHSC research helps link schizophrenia to specific DNA region
8. LSUHSCs Bazan awarded ARRA grant to preserve vision
9. LSUHSC shows for first time infant inhalation of ultrafine air pollution linked to adult lung disease
10. Grant supports LSUHSC research on how like cell receptor systems determine very different functions
11. LSUHSC researchers working to prevent diabetic neuropathy
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:11/22/2016)... --  MedNet Solutions , an innovative SaaS-based eClinical technology ... is pleased to announce that the company has been ... Awards as "Most Outstanding in eClinical Solutions" for ... recognition and growth for MedNet, which has effectively supported ... iMedNet ™ , MedNet,s flagship eClinical technology ...
(Date:11/19/2016)... Securus Technologies, a leading provider of civil ... corrections and monitoring, announced today that it has offered ... an independent technology judge determine who has the largest ... telephone calling platform, and the best customer service. ... of what we do – which clearly is not ...
(Date:11/17/2016)... -- AIC announces that it has just released a new white paper authored by Zettar ... high speed data transfer storage solutions. Photo - http://photos.prnewswire.com/prnh/20161116/440463 ... ... ... Setting up a high performance computing or HPC system can be ...
Breaking Biology News(10 mins):
(Date:12/8/2016)... ... December 08, 2016 , ... KBioBox llc announced today the ... KbioBox developed a sophisticated “3 click” gene dditing off target analysis program and ... website, https://www.kbiobox.com/ and powered by the company’s proprietary BioEngine. Scientists, ...
(Date:12/8/2016)... , Dec. 8, 2016 Soligenix, Inc. ... company focused on developing and commercializing products to treat ... announced today that it will be hosting an Investor ... ET on the origins of innate defense regulators (IDRs) ... review of oral mucositis and the recently announced and ...
(Date:12/8/2016)...   Biocept, Inc . (NASDAQ: ... actionable liquid biopsy tests to improve the management ... its Target Selector™ Circulating Tumor Cell platform demonstrated ... of actionable biomarkers in patients with metastatic breast ... Cannon Research Institute (SCRI), the research arm of ...
(Date:12/7/2016)... Dec. 7, 2016 /PRNewswire/ - OncoQuest Inc. ("OncoQuest"), ... commercialization of immunotherapeutic products for the treatment of ... an Antibody Manufacturing Development Program with Cytovance Biologics ... for its oregovomab antibody product. Supported by recent ... clinical study in ovarian cancer patients, OncoQuest has ...
Breaking Biology Technology: