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Huntington [US], March 31 : A new study led by Marshall University academics focuses on a unique mechsm for the body's salt balance management.The kidney plays a central role in the body's ability to maintain an appropriate sodium balance, which is critical for the determination of blood pressure. Disorders of sodium balance contribute to the development and progression of many common diseases, including hypertension, heart disease and stroke.Na/K-ATPase (NKA) is the enzymatic machinery that drives absorption of sodium along the renal proximal tubule. As such, it makes quite an unlikely candidate as a molecular counteractor of sodium absorption. In contrast, the Xie model for NKA receptor/signaling, named for the late Zijian Xie, Ph.D., predicts that NKA has evolved as the perfect molecular entity to sense intracellular sodium and coordinate the cellular response to temper absorption and maintain a steady delivery to the distal tubule.Using gene targeting in cells and mice to test the respective contributions of NKA signaling and ion pumping to the overall regulation of renal sodium reabsorption, the study revealed that NKA signaling is functionally dominant over NKA ion pumping in the control of renal sodium reabsorption, according to new research published earlier this month in the FASEB journal, which ranks among the top biology journals in the world."This paper represents a major advance and a paradigm shift in renal physiology/mammalian salt handling," said Sandrine Pierre, Ph.D., interim director of the Marshall Institute for Interdisciplinary Research and the corresponding author on the study. "To date, it is the most tangible proof of the validity and physiological significance of the Xie model for sodium pump signaling."Expertise in renal physiology and genetic approaches in experimental models to evaluate the non-classical Na/K-ATPase receptor function was provided by a cross-departmental team of investigators from the Marshall Institute for Interdisciplinary Research (MIIR) and the Joan C. Edwards School of Medicine. Xie, a pioneer of NKA non-ion pumping function, was a driving force behind this project from its inception."Developing the first genetic mouse model targeting NKA in renal proximal tubule cells has allowed us to unmask the dual antagonistic roles of NKA in renal Na+ and water reabsorption," said Shreya Mukherji, Ph.D., a scientist in the rare disease DDU at Takeda Pharmaceuticals U.S.A., Inc. and first author on the study, who conducted major portions of this research as a biomedical graduate student at Marshall University. "However, this is just a stepping stone. Using similar approaches, our group and others will likely dissect new regulatory networks and identify new targets in the management of hypertensive disorders and other highly prevalent chronic conditions."Disclaimer: This post has been auto-published from an agency feed without any modifications to the text and has not been reviewed by an editor

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Technology :Study gives insight into mechanism of body's regulation of salt balance

Washington [US], April 3 : An innovative mechsm of the body's regulation of salt balance is the topic of ... ...

Health :Study sheds new insights into how body handles salt

Huntington [US], March 31 : A new study led by Marshall University academics focuses on a unique mechsm for ... ...