{"id":372,"date":"2012-11-15T12:06:52","date_gmt":"2012-11-15T17:06:52","guid":{"rendered":"http:\/\/med.virginia.edu\/membrane-biology\/?p=372"},"modified":"2026-07-09T21:49:40","modified_gmt":"2026-07-10T01:49:40","slug":"new-discovery-in-blood-pressure-regulation-from-the-isakson-lab-published-in-nature","status":"publish","type":"post","link":"https:\/\/med.virginia.edu\/membrane-biology\/new-discovery-in-blood-pressure-regulation-from-the-isakson-lab-published-in-nature\/","title":{"rendered":"New discovery in blood pressure regulation from the Isakson Lab published in Nature"},"content":{"rendered":"

\"Isakson-discovery\"<\/a><\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

UVA Discovery Helps Explain Blood Pressure Regulation
\nMay Point to New Therapeutic Target for Treating High Blood Pressure<\/p>\n

CHARLOTTESVILLE, Va., Nov. 13, 2012 \u2013 Researchers at the University of Virginia School of Medicine have shed new light on blood pressure regulation with the discovery of an unexpected mechanism by which hemoglobin controls the delivery of nitric oxide. The findings may point to a new therapeutic target for treating high blood pressure and may have far-reaching implications for many organ systems and illnesses.<\/p>\n

Hemoglobin is best known for its role in transporting oxygen in the blood. But it also can bind nitric oxide, a powerful vasodilator. By relaxing smooth muscle cells, nitric oxide widens blood vessels, decreasing blood pressure. The new UVA research shows that there is a complete system within the myoendothelial junction \u2013 the \u201cbridge\u201d between the smooth muscle and the endothelial cells lining the blood vessel walls \u2013 that allows hemoglobin to regulate nitric oxide delivery, essentially controlling the size of the blood vessel.<\/p>\n

The UVA researchers were surprised to spot hemoglobin alpha in the myoendothelial junction. At first they thought it was a mistake. \u201cWe didn\u2019t believe it. We thought it was contamination,\u201d says Brant Isakson, PhD. \u201cMaybe we had a blood smear on our fingers? \u2026 Then we started to put two and two together.\u201d<\/p>\n

What they found has earned them a place in the pages of the prestigious journal Nature.<\/p>\n

An unexpected mystery solved
\nThe UVA team had seen reports of hemoglobin alpha from other researchers looking at myoendothelial junctions. But it would typically be one protein in a list of many, reported for the sake of completeness. The UVA researchers, however, realized hemoglobin alpha was actually regulating the binding of nitric oxide, directly affecting the size of the blood vessel.<\/p>\n

\u201cTo make a complicated story short, we did find it binds the nitric oxide, and it can bind it very tightly or loosely,\u201d Isakson says. \u201cBasically what we have in this very localized structure is a complete system for regulating nitric oxide delivery to the smooth muscle.\u201d<\/p>\n

A cause of high blood pressure?
\nSome chronic problems with high blood pressure, Isakson suspects, may be the result of problems with the amount of hemoglobin in the blood vessel wall.<\/p>\n

\u201cThe implications for this research are very widespread. The most immediate thing is blood pressure regulation,\u201d Isakson says. \u201cWe\u2019re trying to find ways to specifically delete hemoglobin alpha in the blood vessel wall and look at blood pressure changes.\u201d<\/p>\n

Far-reaching implications
\nBut the mechanism the UVA researchers have identified may play an important role in many other parts of the body, and possibly in many illnesses. \u201cThere are all these scattered reports of hemoglobin and [nitrogen oxide signaling] expressed in the lungs, for example, and in neurons, and in all these other places. Maybe, just maybe, it\u2019s very similar to what we show here: That they form this macromolecular complex and that can very tightly regulate how much nitric oxide is delivered,\u201d Isakson says.<\/p>\n

\u201cIn our case, we\u2019re very interested in how that nitric oxide regulates blood pressure and dilates the smooth muscle. But you can extrapolate that to neurons. Neurons use nitric oxide for their cell communication,\u201d he says. \u201cInflammatory responses, there\u2019s another big one. Nitric oxide is anti-inflammatory. We\u2019re really extrapolating here, but if we are correct, if you can regulate how much nitric oxide is released by this complex, then you can regulate the inflammatory response.\u201d<\/p>\n

For the Nature publication<\/a>, click here.
\nThe findings have been published by Nature online and will appear in a forthcoming print edition. The paper is authored by Adam C. Straub, Alexander W. Lohman, Marie Billaud, Scott R. Johnstone, Scott T. Dwyer, Monica Y. Lee, Pamela Schoppee Bortz, Angela K. Best, Linda Columbus, Benjamin Gaston and Brant E. Isakson.<\/p>\n

Josh Barney
\nLead editor
\nUniversity of Virginia Health System
\n243-1988<\/p>\n","protected":false},"excerpt":{"rendered":"

      UVA Discovery Helps Explain Blood Pressure Regulation May Point to New Therapeutic Target for Treating High Blood Pressure CHARLOTTESVILLE, Va., Nov. 13, 2012 \u2013 Researchers at the University of Virginia School of Medicine have shed new light on blood pressure regulation with the discovery of an unexpected mechanism by which hemoglobin controls […]<\/p>\n","protected":false},"author":431,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":"","_members_access_role":[],"_members_access_error":"","_links_to":"","_links_to_target":""},"categories":[1],"tags":[40],"class_list":["post-372","post","type-post","status-publish","format-standard","hentry","category-news","tag-intranet"],"acf":false,"yoast_head":"\nNew discovery in blood pressure regulation from the Isakson Lab published in Nature - Center for Membrane and Cell Physiology<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/med.virginia.edu\/membrane-biology\/new-discovery-in-blood-pressure-regulation-from-the-isakson-lab-published-in-nature\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"New discovery in blood pressure regulation from the Isakson Lab published in Nature - 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