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<p><b>Hydration driven transport of deformable lipid vesicles through fine pores and the skin barrier.</b></p> <p>G. Cevc, D. Gebauer</p> <p><b>Biophys. J. 84: 1010-1024 (2003).</b></p> <p>We studied aggregate transport through semi-permeable, nano-porous barriers experimentally and theoretically. By measuring and modelling the effect of hydration gradient across such barriers, spontaneous transbarrier transport of suitable lipid aggregates in vesicular form was proven to be driven by partial aggregate de/hydration at the application site. By generalizing Onsager transport model we derived a set of equations that rationalize all pertinent observations. Dehydration-induced vesicle motion starts with a lag time. This corresponds to the time needed to reach the limiting vesicle hydration; both are proportional to the starting excess water volume and decrease with increasing relative humidity at application site. The rate of transbarrier transport is insensitive to these parameters but increases with vesicle deformability and volume exchange capability. Both these properties depend on membrane composition. Reversible demixing of bilayer components is the cause of non-linear bilayer characteristics and also potentially affects the effective membrane hydrophilicity. High hydrophilicity of vesicle surface and extreme aggregate shape adaptability together are necessary for successful material transport across the skin. This demonstrates the significance of basic biophysical investigations for better understanding of biological systems and for the practical use of artificial, nature inspired carriers in drug delivery.</p> <p><a href="index.html"><----</a> | <a href="../.././index.html" target="_top" onmouseover="putstattext('What is special about IDEA?'); return true;">Home</a> | <a href="../../about-us/index.html" target="_top" onmouseover="putstattext('About IDEA history, people, external collaboratory and future plans.'); return true;">About us</a> | <a href="../../corporate_factsheet/index.html" target="_top" onmouseover="putstattext('Corporate Factsheet'); return true;">Corporate Factsheet</a> | <a href="../../science/index.html" target="_top" onmouseover="putstattext('Academic collaborations, publications, etc.'); return true;">Science</a> | Publications | <a href="../../product_opportunities/index.html" target="_top" onmouseover="putstattext('IDEA offers better compliance, local drug targeting and patent protection.'); return true;">Product opportunities</a> | <a href="../../financial/index.html" target="_top" onmouseover="putstattext('Investors and basic financial data.'); return true;">Finance</a> | <a href="../../press_releases/index.html" target="_top" onmouseover="putstattext('Original texts.'); return true;">Press releases</a> | <a href="../../latest_newsletter/index.html" target="_top" onmouseover="putstattext('IDEAS latest newsletter'); return true;">Latest newsletter</a> | <a href="../../press_clippings/index.html" target="_top" onmouseover="putstattext('IDEA in the press.'); return true;">Press clippings</a> | <a href="../../conferences/index.html" target="_top" onmouseover="putstattext('Here you will find many dates where you can meet us and where we can talk...'); return true;">Conferences</a> | <a href="../../career/index.html" target="_top" onmouseover="putstattext('We constantly seek best talents and dedication, offering much in return.'); return true;">Career</a> | <a href="../../contact/index.html" target="_top" onmouseover="putstattext('We would like to hear from you!'); return true;">Contact</a> | <a href="../../faq/index.html" target="_top" onmouseover="putstattext('Product bio/acceptability, liposome/Transfersome, ...'); return true;">Scientific FAQ</a> | <a href="../../glossary/index.html" target="_top" onmouseover="putstattext(''); return true;">Glossary</a> | <a href="../../sitemap/index.html" target="_top" onmouseover="putstattext('Get an impression on IDEA!'); return true;">Site Map</a> | <a href="../../search/index.html" target="_top" onmouseover="putstattext('Find documents based on keywords!'); return true;">Search</a> |  </p>