{"647953":{"#nid":"647953","#data":{"type":"news","title":"A Breakthrough in the Physics of Blood Clotting ","body":[{"value":"\u003Cp\u003EHeart attacks and strokes \u0026ndash; the leading causes of death in human beings \u0026ndash; are fundamentally blood clots of the heart and brain. Better understanding how the blood-clotting process works and how to accelerate or slow down clotting, depending on the medical need, could save lives.\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003ENew research by Georgia Tech and Emory University published in the journal \u003Cem\u003EBiomaterials\u003C\/em\u003E sheds new light on the mechanics and physics of blood clotting through modeling the dynamics at play during a still poorly understood phase of blood clotting called clot contraction.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026ldquo;Blood clotting is actually a physics-based phenomenon that must occur to stem bleeding after an injury,\u0026rdquo; said \u003Ca href=\u0022https:\/\/bme.gatech.edu\/bme\/faculty\/Wilbur-A.-Lam\u0022\u003EWilbur A. Lam\u003C\/a\u003E, W. Paul Bowers Research Chair, in the Department of Pediatrics and the \u003Ca href=\u0022https:\/\/bme.gatech.edu\/\u0022\u003EWallace H. Coulter Department of Biomedical Engineering\u003C\/a\u003E at Emory University and Georgia Institute of Technology. \u0026ldquo;The biology is known. The biochemistry is known. But how this ultimately translates into physics is an untapped area.\u0026rdquo;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EAnd that\u0026rsquo;s a problem, argues Lam and his research colleagues, since blood clotting is ultimately about \u0026ldquo;how good of a seal can the body make on this damaged blood vessel to stop bleeding, or when this goes wrong, how does the body accidentally make clots in our heart vessels or in our brain?\u0026rdquo;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EHow Blood Clotting Works\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThe workhorses to stem bleeding are platelets \u0026ndash; tiny 2-micrometer cells in the blood in charge of making the initial plug, said Lam. The clot that forms is called fibrin, which acts as a glue scaffold that the platelets attach to and pull against. Blood clot contraction arises when these platelets interact with this fibrin scaffold. To demonstrate the contraction, the researchers embedded a three-millimeter-sized Jell-O mold of a LEGO figure with millions of platelets and fibrin to recreate a simplified version of a blood clot.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026ldquo;What we don\u0026#39;t know is \u0026lsquo;How does that work?\u0026#39; \u0026lsquo;What\u0026#39;s the timing of it so all these cells work together -- do they all pull at the same time?\u0026rsquo; Those are the fundamental questions that we worked together to answer,\u0026rdquo; Lam said.\u003C\/p\u003E\r\n\r\n\u003Cp\u003ELam\u0026rsquo;s Lab collaborated with Georgia Tech\u0026rsquo;s Complex Fluids Modeling and Simulation Group headed by \u003Ca href=\u0022http:\/\/www.me.gatech.edu\/faculty\/alexeev\u0022\u003EAlexander Alexeev\u003C\/a\u003E, professor and Anderer Faculty Fellow in T\u003Ca href=\u0022http:\/\/www.me.gatech.edu\/\u0022\u003Ehe George W. Woodruff School of Mechanical Engineering\u003C\/a\u003E, to create a computational model of a contracting clot. The model incorporates fibrin fibers forming a three-dimensional network and distributed platelets that can extend filopodia, or the tentacle-like structures that extend from cells so they can attach to specific surfaces, to pull the nearby fibers.\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EModel Shows Platelets Dramatically Reducing Clot Volume\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EWhen the researchers simulated a clot where a large group of platelets was activated at the same time, the tiny cells could only reach nearby fibrins because the platelets can extend filopodia that are rather short, less than 6 micrometers. \u0026ldquo;But in a trauma, some platelets contract first. They shrink the clot so the other platelets will see more fibrins nearby, and it effectively increases the clot force,\u0026rdquo; Alexeev explained. Just due to the asynchronous platelet activity, the force enhancement can be as high as 70% leading to an 90% decrease of the clot volume.\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026ldquo;The simulations showed that the platelets work best when they\u0026rsquo;re not in total sync with each other,\u0026rdquo; said Lam. \u0026ldquo;These platelets are actually pulling at different times and by doing that they\u0026rsquo;re increasing the efficiency (of the clot).\u0026rdquo;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThis phenomenon, dubbed by the team, asynchronous mechanical amplification, is most pronounced \u0026ldquo;when we have the right concentration of the platelets corresponding to that of healthy patients,\u0026rdquo; Alexeev said.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EResearch Could Lead to Better Ways to Treat Clotting, Bleeding Issues\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThe findings could open medical options for people with clotting issues, said Lam, who treats young patients with blood disorders as a pediatric hematologist in the Aflac Cancer \u0026amp; Blood Disorders Center at Children\u0026rsquo;s Healthcare of Atlanta.\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026ldquo;If we know why this happens, then we have a whole new potential avenue of treatments for diseases of blood clotting,\u0026rdquo; he said, emphasizing that heart attacks and strokes occur when this biophysical process goes wrong.\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003ELam explained that fine tuning this contraction process to make it faster or more robust could help patients who are bleeding from a car accident, or in the case of a heart attack, make the clotting less intense and slow it down. \u0026nbsp;\u0026ldquo;Understanding the physics of this clot contraction could potentially lead to new ways to both treat bleeding problems and clotting problems.\u0026rdquo;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EAlexeev added that their research also could lead to new biomaterials such as a new type of Band-Aid that could help augment the clotting process.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EFirst author and Georgia Tech PhD candidate \u003Ca href=\u0022https:\/\/cfms.gatech.edu\/group\/yueyi-diana-sun-phd-student\/\u0022\u003EYueyi Sun\u003C\/a\u003E says the coolest aspect of this research was the simplicity of the model and the fact that the simulations allowed her and the team to understand how the platelets work together to contract the fibrin clot as they would in the body.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026ldquo;When we started to include the heterogeneous activation suddenly it gave us the correct volume contraction,\u0026rdquo; she said. \u0026ldquo;Allowing the platelets to have some time delay so one can use what the previous ones did as a better starting point was really neat to see. I think our model can potentially be used to provide guidelines for designing novel active biological and synthetic materials.\u0026rdquo;\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003ESun agreed with her research colleagues that this phenomenon might occur in other aspects of nature. For example, multiple asynchronous actuators can fold a large net more effectively to enhance packaging efficiency without the need of incorporating additional actuators.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026ldquo;It theoretically could be an engineered principle,\u0026rdquo; said Lam. \u0026ldquo;For a wound to shrink more, maybe we don\u0026#39;t have the chemical reactions occur at the same time \u0026ndash; maybe we have different chemical reactions occur at different times. You gain better efficiency and contraction when one allows half or all of the platelets to do the work together.\u0026rdquo;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EBuilding on the research, Sun hopes to examine more closely how a single platelet force converts or is transmitted to the clot force, and how much force is needed to hold two sides of a graph together from a thickness and width standpoint. Sun also intends to include red blood cells in their model since red blood cells account for 40% of all blood and play a role in defining the clot size. \u0026ldquo;If your red blood cells are too easily trapped in your clot, then you are more likely to have a large clot, which causes a thrombosis issue,\u0026rdquo; she explained.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cem\u003EThis work is funded by the National Science Foundation (DMR Awards 1809566 and CAREER 1255288) and the National Institutes of Health (Awards R35HL145000, R21EB026591, and R01HL155330). \u0026nbsp;\u003C\/em\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003ECITATION:\u003C\/strong\u003E Y. Sun, et.al., \u0026ldquo;Platelet heterogeneity enhances blood clot volumetric contraction: An example of asynchrono-mechanical amplification.\u0026rdquo; (\u003Cem\u003EBiomaterials \u003C\/em\u003E274, 120828, 2021) \u003Ca href=\u0022https:\/\/doi.org\/10.1016\/j.biomaterials.2021.120828\u0022\u003E\u0026nbsp;https:\/\/doi.org\/10.1016\/j.biomaterials.2021.120828\u003C\/a\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E***\u003Cbr \/\u003E\r\nThe Georgia Institute of Technology, or\u0026nbsp;Georgia Tech, is a top 10 public research university developing leaders who advance technology and improve the human condition.\u003Cbr \/\u003E\r\nThe Institute offers\u0026nbsp;business,\u0026nbsp;computing,\u0026nbsp;design,\u0026nbsp;engineering,\u0026nbsp;liberal arts, and\u0026nbsp;sciences\u0026nbsp;degrees. Its nearly 40,000 students, representing 50 states and 149 countries, study at the main campus in Atlanta, at campuses in France and China, and through distance and online learning.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EAs a leading technological university, Georgia Tech is an engine of economic development for Georgia, the Southeast, and the nation, conducting more than $1 billion in research annually for government, industry, and society.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EWriter: \u003C\/strong\u003EAnne Wainscott-Sargent\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":[{"value":"New Research Shows Platelets Do their Job Better When Not in Total Sync with One Another   "}],"field_summary":[{"value":"\u003Cp\u003EDuring trauma, certain platelets (tiny 2-micrometer cells in the blood in charge of making the initial plug) contract first. They shrink the clot so the other platelets will see more fibrins nearby, effectively increasing the clot force.\u0026nbsp;The simulations showed that the platelets work best when they\u0026rsquo;re not in total sync with each other. The\u0026nbsp;platelets pull\u0026nbsp;at different times --\u0026nbsp;increasing the efficiency of the clot.\u003Cbr \/\u003E\r\n\u0026nbsp;\u003C\/p\u003E\r\n","format":"limited_html"}],"field_summary_sentence":[{"value":"New research by Georgia Tech and Emory University sheds new light on the mechanics and physics of blood clotting and could lead to better ways to treat clotting and bleeding issues."}],"uid":"35692","created_gmt":"2021-06-07 17:52:02","changed_gmt":"2021-06-08 13:53:14","author":"Anne Sargent","boilerplate_text":"","field_publication":"","field_article_url":"","dateline":{"date":"2021-06-07T00:00:00-04:00","iso_date":"2021-06-07T00:00:00-04:00","tz":"America\/New_York"},"extras":[],"hg_media":{"647946":{"id":"647946","type":"image","title":"Yueyi Sun","body":null,"created":"1623085479","gmt_created":"2021-06-07 17:04:39","changed":"1623085479","gmt_changed":"2021-06-07 17:04:39","alt":"","file":{"fid":"245962","name":"First author photo in lab.jpg","image_path":"\/sites\/default\/files\/images\/First%20author%20photo%20in%20lab.jpg","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/images\/First%20author%20photo%20in%20lab.jpg","mime":"image\/jpeg","size":532098,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/images\/First%20author%20photo%20in%20lab.jpg?itok=cCW9EsKk"}},"647947":{"id":"647947","type":"image","title":"Blood clotting modeling researchers","body":null,"created":"1623085554","gmt_created":"2021-06-07 17:05:54","changed":"1623085554","gmt_changed":"2021-06-07 17:05:54","alt":"","file":{"fid":"245963","name":"Researchers Photo.jpg","image_path":"\/sites\/default\/files\/images\/Researchers%20Photo.jpg","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/images\/Researchers%20Photo.jpg","mime":"image\/jpeg","size":667024,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/images\/Researchers%20Photo.jpg?itok=Ce2s7jrJ"}}},"media_ids":["647946","647947"],"groups":[{"id":"1188","name":"Research Horizons"}],"categories":[{"id":"138","name":"Biotechnology, Health, Bioengineering, Genetics"}],"keywords":[{"id":"23731","name":"blood clotting"},{"id":"187997","name":"efficient blood clotting"},{"id":"187998","name":"physics of blood contraction"},{"id":"187915","name":"go-researchnews"},{"id":"187423","name":"go-bio"},{"id":"126571","name":"go-PetitInstitute"},{"id":"93061","name":"Institute for Electronics and Nanotechnoloy"}],"core_research_areas":[{"id":"39441","name":"Bioengineering and Bioscience"},{"id":"39431","name":"Data Engineering and Science"},{"id":"39451","name":"Electronics and Nanotechnology"}],"news_room_topics":[{"id":"71891","name":"Health and Medicine"}],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003EResearch News\u003C\/p\u003E\r\n\r\n\u003Cp\u003EAnne Wainscott-Sargent\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cdiv\u003E(404-435-5784)\u0026nbsp;\r\n\u003Cdiv\u003E\u0026nbsp;\u003C\/div\u003E\r\n\r\n\u003Cdiv\u003ETracey Reeves\u0026nbsp;\u003C\/div\u003E\r\n\r\n\u003Cdiv\u003E(404-660-2929)\u0026nbsp;\u003C\/div\u003E\r\n\r\n\u003Cdiv\u003Etracey.reeves@gatech.edu\u003C\/div\u003E\r\n\u003C\/div\u003E\r\n","format":"limited_html"}],"email":["asargent7@gatech.edu"],"slides":[],"orientation":[],"userdata":""}}}