Name: design of a cyclic pressure bioreactor for the ex vivo study of aortic heart valves
Uploaded: 2011-08-23T13:00:00
Description: Watch this Scientific Journal Video about Design of a Cyclic Pressure Bioreactor for the Ex Vivo Study of Aortic Heart Valves at JoVE.com

लेखकों प्रणाली और पांडुलिपि की तैयारी के साथ सहायता के लिए Valtresa Myles के डिजाइन और निर्माण के साथ उनकी सहायता के लिए शाद Schipke और डैनियल Chesser के लिए आभारी हैं.

1. ऊतक हार्वेस्ट और तैयार <ol><li> महाधमनी वाल्व वयस्क मृत्यु के तुरंत बाद 120 से अधिक नहीं एलबीएस वजन सूअरों से एकत्र होना चाहिए. </li><li> वाल्व बाँझ फॉस्फेट के साथ दो बार धो buffered खारा (PBS) और बर्फ पर प्रयोगशाला के लिए ?...

<ol>
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W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Aortic+valve+sclerosis+is+associated+with+preclinical+cardiovascular+disease+in+hypertensive+adults:+the+Hypertension+Genetic+Epidemiology+Network+study.">Aortic valve sclerosis is associated with preclinical cardiovascular disease in hypertensive adults: the Hypertension Genetic Epidemiology Network study.</a> J Hypertens. 23, 867-8673 (2005).</li><li>Cawley, P. J., Otto, C. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Prevention+of+calcific+aortic+valve+stenosis+-+fact+or+fiction.">Prevention of calcific aortic valve stenosis - fact or fiction.</a> Annals of Medicine. 41, 100-108 (2009).</li><li>Durst, C. A., Grande-Allen, J. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Design+and+physical+characterization+of+a+synchronous+multivalve+aortic+valve+culture+system.">Design and physical characterization of a synchronous multivalve aortic valve culture system.</a> Ann Biomed Eng. 38, 319-3125 (2010).</li><li>Engelmayr, G. C., Soletti, L., Vigmostad, S. C., Budilarto, S. G., Federspiel, W. J., Chandran, K. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+novel+flex-stretch-flow+bioreactor+for+the+study+of+engineered+heart+valve+tissue+mechanobiology.">A novel flex-stretch-flow bioreactor for the study of engineered heart valve tissue mechanobiology.</a> Ann Biomed Eng. 36, 700-712 (2008).</li><li>Sucosky, P., Padala, M., Elhammali, A., Balachandran, K., Jo, H., Yoganathan, A. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Design+of+an+ex+vivo+culture+system+to+investigate+the+effects+of+shear+stress+on+cardiovascular+tissue.">Design of an ex vivo culture system to investigate the effects of shear stress on cardiovascular tissue.</a> J Biomech Eng. 130, 035001-03 (2008).</li><li>Syedain, Z. H., Tranquillo, R. T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Controlled+cyclic+stretch+bioreactor+for+tissue-engineered+heart+valves.">Controlled cyclic stretch bioreactor for tissue-engineered heart valves.</a> Biomaterials. 30, 4078-4084 (2009).</li><li>Lagana, K., Moretti, M., Dubini, G., Raimondi, M. T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+new+bioreactor+for+the+controlled+application+of+complex+mechanical+stimuli+for+cartilage+tissue+engineering.">A new bioreactor for the controlled application of complex mechanical stimuli for cartilage tissue engineering.</a> Proc Inst Mech Eng H. 222, 705-715 (2008).</li><li>Wartella, K. A., Wayne, J. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Bioreactor+for+biaxial+mechanical+stimulation+to+tissue+engineered+constructs.">Bioreactor for biaxial mechanical stimulation to tissue engineered constructs.</a> J Biomech Eng. 131, 044501-044501 (2009).</li><li>Wallis, M. C., Yeger, H., Cartwright, L., Shou, Z., Radisic, M., Haig, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Feasibility+study+of+a+novel+urinary+bladder+bioreactor.">Feasibility study of a novel urinary bladder bioreactor.</a> Tissue Eng Part A. 14, 339-348 (2008).</li><li>Butcher, J. T., Nerem, R. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Valvular+endothelial+cells+regulate+the+phenotype+of+interstitial+cells+in+co-culture:+effects+of+steady+shear+stress.">Valvular endothelial cells regulate the phenotype of interstitial cells in co-culture: effects of steady shear stress.</a> Tissue Eng. 12, 905-915 (2006).</li><li>Metzler, S. A., Pregonero, C. A., Butcher, J. T., Burgess, S. C., Warnock, J. N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cyclic+Strain+Regulates+Pro-Inflammatory+Protein+Expression+in+Porcine+Aortic+Valve+Endothelial+Cells.">Cyclic Strain Regulates Pro-Inflammatory Protein Expression in Porcine Aortic Valve Endothelial Cells.</a> J Heart Valve Dis. 17, 571-578 (2008).</li><li>Schipke, K. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Design of a cyclic pressure bioreactor for the ex vivo study of aortic heart valve mechanobiology. , (2008).</li><li>Smith, K. E., Metzler, S. A., Warnock, J. N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cyclic+strain+inhibits+acute+pro-inflammatory+gene+expression+in+aortic+valve+interstitial+cells.">Cyclic strain inhibits acute pro-inflammatory gene expression in aortic valve interstitial cells.</a> Biomechanics and Modeling in Mechanobiology. , (2009).</li><li>Warnock, J. N., Burgess, S. C., Shack, A., Yoganathan, A. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Differential+immediate-early+gene+responses+to+elevated+pressure+in+porcine+aortic+valve+interstitial+cells.">Differential immediate-early gene responses to elevated pressure in porcine aortic valve interstitial cells.</a> J Heart Valve Dis. 15, 34-41 (2006).</li><li>Brathwaite, D., Weissman, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+new+onset+of+atrial+arrhythmias+following+major+noncardiothoracic+surgery+is+associated+with+increased+mortality.">The new onset of atrial arrhythmias following major noncardiothoracic surgery is associated with increased mortality.</a> Chest. 114, 462-468 (1998).</li><li>Walsh, S. R., Oates, J. E., Anderson, J. A., Blair, S. D., Makin, C. A., Walsh, C. 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दबाव प्रणाली को सफलतापूर्वक चक्रीय दबाव है कि diastolic transvalvular दबाव के प्रतिनिधि थे महाधमनी वाल्व पत्रक अवगत कराया. हालांकि, यह सिस्टोलिक transvalvular दबाव नकल करने में सक्षम नहीं था दबाव के रूप में केवल 40 mmHg के लिए गि?...

<table border="1"><tbody><tr><th> अभिकर्मक के नाम </th><th> कंपनी </th><th> सूचीपत्र संख्या </th><th> टिप्पणियां (वैकल्पिक) </th></tr><tr><td> DMEM </td><td> सिग्मा </td><td> D5671 </td><td></td></tr><tr><td> Dulbecco पीबीएस </td><td> सिग्मा </td><td> D5652 </td><td></td></tr><tr><td> Anti-mycotic/antibiotic समाधान </td><td> सिग्मा </td><td> A5955 </td><td></td></tr><tr><td> भ्रूण गोजातीय सीरम </td><td> ThermoScientific </td><td> SH30070 </td><td></td></tr><tr><td> Viton डायाफ्राम solenoid वाल्व </td><td> McMaster Carr </td><td> 4868K11 </td><td></td></tr><tr><td> दबाव ट्रांन्सड्यूसर </td><td> ओमेगा इंजीनियरिंग इंक, </td><td> PX302-200GV </td><td></td></tr><tr><td> लोड सेल कंडीशनर </td><td> दोहराना इलेक्ट्रॉनिक्स इंक, </td><td> 4025-101 </td><td></td></tr><tr><td> डाटा अधिग्रहण मॉड्यूल (DAQ) </td><td> मापन कम्प्यूटिंग </td><td> PMD1608 </td><td></td></tr></tbody></table>

design of a cyclic pressure bioreactor for the ex vivo study of aortic heart valves

The aortic valve, located between the left ventricle and the aorta, allows for unidirectional blood flow, preventing backflow into the ventricle. Aortic valve leaflets are composed of interstitial cells suspended within an extracellular matrix (ECM) and are lined with an endothelial cell monolayer. The valve withstands a harsh, dynamic environment and is constantly exposed to shear, flexion, tension, and compression. Research has shown calcific lesions in diseased valves occur in areas of high mechanical stress as a result of endothelial disruption or interstitial matrix damage1-3. Hence, it is not surprising that epidemiological studies have shown high blood pressure to be a leading risk factor in the onset of aortic valve disease4. 
The only treatment option currently available for valve disease is surgical replacement of the diseased valve with a bioprosthetic or mechanical valve5. Improved understanding of valve biology in response to physical stresses would help elucidate the mechanisms of valve pathogenesis. In turn, this could help in the development of non-invasive therapies such as pharmaceutical intervention or prevention. Several bioreactors have been previously developed to study the mechanobiology of native or engineered heart valves6-9. Pulsatile bioreactors have also been developed to study a range of tissues including cartilage10, bone11 and bladder12. The aim of this work was to develop a cyclic pressure system that could be used to elucidate the biological response of aortic valve leaflets to increased pressure loads. 
The system consisted of an acrylic chamber in which to place samples and produce cyclic pressure, viton diaphragm solenoid valves to control the timing of the pressure cycle, and a computer to control electrical devices. The pressure was monitored using a pressure transducer, and the signal was conditioned using a load cell conditioner. A LabVIEW program regulated the pressure using an analog device to pump compressed air into the system at the appropriate rate. The system mimicked the dynamic transvalvular pressure levels associated with the aortic valve; a saw tooth wave produced a gradual increase in pressure, typical of the transvalvular pressure gradient that is present across the valve during diastole, followed by a sharp pressure drop depicting valve opening in systole. The LabVIEW program allowed users to control the magnitude and frequency of cyclic pressure. The system was able to subject tissue samples to physiological and pathological pressure conditions. This device can be used to increase our understanding of how heart valves respond to changes in the local mechanical environment.

Watch this Scientific Journal Video about Design of a Cyclic Pressure Bioreactor for the Ex Vivo Study of Aortic Heart Valves at JoVE.com

Design of a Cyclic Pressure Bioreactor for the Ex Vivo Study of Aortic Heart Valves

एक चक्रीय दबाव शारीरिक और रोग दबाव की स्थिति के लिए हृदय वाल्व ऊतक subjecting के सक्षम bioreactor डिजाइन किया गया है. एक LabVIEW कार्यक्रम उपयोगकर्ताओं को दबाव परिमाण आयाम और आवृत्ति को नियंत्रित करने के लिए अनुमति देता है. इस डिवाइस को हृदय वाल्व ऊतक या अलग कक्षों की mechanobiology का अध्ययन करने के लिए इस्तेमाल किया जा सकता है.

डिजाइन के लिए एक चक्रीय दबाव bioreactor पूर्व vivo</emमहाधमनी हार्ट वाल्व का> अध्ययन

The aortic valve, located between the left ventricle and the aorta, allows for unidirectional blood flow, preventing backflow into the ventricle. Aortic ...

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Design of a Cyclic Pressure Bioreactor for the Ex Vivo Study of Aortic Heart Valves

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डिजाइन के लिए एक चक्रीय दबाव bioreactor पूर्व vivo अध्ययन