Document Detail

Formation of Lipid Sheaths around Nanoparticle-Supported Lipid Bilayers.
MedLine Citation:
PMID:  22434657     Owner:  NLM     Status:  Publisher    
High-surface-area nanoparticles often cluster, with unknown effects on their cellular uptake and environmental impact. In the presence of vesicles or cell membranes, lipid adsorption can occur on the nanoparticles, resulting in the formation of supported lipid bilayers (SLBs), which tend to resist cellular uptake. When the amount of lipid available is in excess compared with that required to form a single-SLB, large aggregates of SLBs enclosed by a close-fitting lipid bilayer sheath are shown to form. The proposed mechanism for this process is one where small unilamellar vesicles (SUVs) adsorb to aggregates of SLBs just above the gel-to-liquid phase transition temperature, T(m) , of the lipids (as observed by dynamic light scattering), and then fuse with each other (rather than to the underlying SLBs) upon cooling below T(m) . The sacks of SLB nanoparticles that are formed are encapsulated by the contiguous close-fitting lipid sheath, and precipitate below T(m) , due to reduced hydration repulsion and the absence of undulation/protrusion forces for the lipids attached to the solid support. The single-SLBs can be released above T(m) , where these forces are restored by the free lipid vesicles. This mechanism may be useful for encapsulation/release of drugs/DNA, and has implications for the toxic effects of nanoparticles, which may be mitigated by lipid sequestration.
Selver Ahmed; Sushma Savarala; Yanjing Chen; Geoffrey Bothun; Stephanie L Wunder
Related Documents :
24651367 - Shape-responsive liquid crystal elastomer bilayers.
24548267 - Self-assembled organic nanowires for high power density lithium ion batteries.
23712567 - Calling behaviour under climate change: geographic and seasonal variation of calling te...
9119757 - Changes in cochlear function after double-membrane rupture in the guinea pig.
23474357 - Assessing vehicle effects on skin absorption using artificial membrane assays.
7338727 - Temperature-sensitive periods of sex determination in emydid turtles.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-3-21
Journal Detail:
Title:  Small (Weinheim an der Bergstrasse, Germany)     Volume:  -     ISSN:  1613-6829     ISO Abbreviation:  -     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-3-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101235338     Medline TA:  Small     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Department of Chemistry, Temple University, Philadelphia, PA, 19317, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Serum response factor regulates bone formation via IGF-1 and Runx2 signals.
Next Document:  Mechanism of the Transition-Metal-Catalyzed Hydroarylation of Bromo-Alkynes Revisited: Hydrogen vers...