Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Penn-Led Collaboration Mimics Library of Bio-Membranes for Use In Nanomedicine, Drug Delivery

Cryo-TEM and 3-D intensity profiles of (A and D) polygonal dendrimersomes. (B and E) Bicontinuous cubic particles co-exist with low concentration of spherical dendrimersomes. (C and F) Micelles. (G and J) Tubular dendrimersomes. (H and K) Rodlike, ribbon and helical micelles. (I and L) Disk-like micelles and toroids. Credit: University of Pennsylvania
Cryo-TEM and 3-D intensity profiles of (A and D) polygonal dendrimersomes. (B and E) Bicontinuous cubic particles co-exist with low concentration of spherical dendrimersomes. (C and F) Micelles. (G and J) Tubular dendrimersomes. (H and K) Rodlike, ribbon and helical micelles. (I and L) Disk-like micelles and toroids. Credit: University of Pennsylvania

Abstract:
An international collaboration led by chemists and engineers from the University of Pennsylvania has prepared a library of synthetic biomaterials that mimic cellular membranes and that show promise in targeted delivery of cancer drugs, gene therapy, proteins, imaging and diagnostic agents and cosmetics safely to the body in the emerging field called nanomedicine.

The study appears in the current issue of the journal Science.

Penn-Led Collaboration Mimics Library of Bio-Membranes for Use In Nanomedicine, Drug Delivery

Philadelphia, PA | Posted on May 22nd, 2010

The research provides the first description of the preparation, structure, self-assembly and mechanical properties of vesicles and other selected complex nano-assemblies made from Janus dendrimers.

The so-called dendrimersomes are stable, bilayer vesicles that spontaneously form from the exact chemical composition of Janus dendrimers. The team reported a myriad of bilayer capsule populations, uniform in size, stable in time in a large variety of media and temperatures, that are tunable by temperature and chemistry with superior mechanical properties to regular liposomes and impermeable to encapsulated compounds. They are capable of incorporating pore-forming proteins, can assemble with structure-directing phospholipids and block copolymers and offer a molecular periphery suitable for chemical functionalization without affecting their self-assembly.

Co-authors Virgil Percec of Penn's Department of Chemistry and Daniel A. Hammer of Penn's Department of Bioengineering, joined by Frank Bates and Timothy Lodge of the University of Minnesota, Michael Klein of Temple University and Kari Rissanen of the Jyväskylä University, in Finland, have chemically coupled hydrophilic and hydrophobic dendrons to create amphiphilic Janus dendrimers with a rich palette of morphologies including cubosomes, disks, tubular vesicles and helical ribbons and confirmed the assembled structures using cryogenic transmission electron microscopy and fluorescence microscopy.

"Dendrimersomes marry the stability and mechanical strength obtainable from polymersomes, vesicles made from block copolymers, with the biological function of stabilized phospholipid liposomes," said Percec, the P. Roy Vagelos Chair and Professor of Chemistry at Penn, "but with superior uniformity of size, ease of formation and chemical functionalization."

"These materials show special promise because their membranes are the thickness of natural bilayer membranes, but they have superior and tunable materials properties," said Hammer, the Alfred G. and Meta A. Ennis Professor of Bioengineering at Penn. "Because of their membrane thickness, it will be more straightforward to incorporate biological components into the vesicle membranes, such as receptors and channels."

"No other single class of molecules including block copolymers and lipids is known to assemble in water into such a diversity of supramolecular structures," said Bates, the Regents Professor and Head of the Chemical Engineering and Materials Science Department at the University of Minnesota.

Self-assembled nanostructures, obtained from natural and synthetic amphiphiles, increasingly serve as mimics of biological membranes and enable the targeted delivery of drugs, nucleic acids, proteins, gene therapy and imaging agents for diagnostic medicine. The challenge for researchers is creating these precise molecular arrangements that combine to function as safe biological carriers while carrying payload within.

Janus dendrimer assemblies offer several advantages to other competing technologies for nano-particle delivery. Liposomes are mimics of cell membranes assembled from natural phospholipids or from synthetic amphiphiles, including polymersomes. But, liposomes are not stable, even at room temperature, and vary widely in size, requiring tedious stabilization and fractionation for all practical applications. Polymersomes, on the other hand, are stable but polydisperse, and most of them are not biocompatible, requiring scientific intervention to combine the best properties of both for nanomedicine. Dendrimersomes offer stability, monodispersity, tenability and versatility, and they significantly advance the science of self-assembled nanostructures for biological and medical applications.

The study was conducted by Percec, Daniela A. Wilson, Pawaret Leowanawat, Christopher J. Wilson, Andrew D. Hughes, Emad Aqad, Brad M. Rosen, Andreea O. Argintaru, Monika J. Sienkowska and Mark S. Kaucher of Penn's Department of Chemistry; Hammer of the Department of Bioengineering, the Department of Chemical and Biomolecular Engineering and the Institute for Medicine and Engineering at Penn; Dalia H. Levine and Anthony J. Kim of Penn's Department of Chemical and Biomolecular Engineering; Bates, Kevin P. Davis and Timothy P. Lodge of the University of Minnesota; Michael L. Klein and Russell H. DeVane of Temple University; Kari Rissanen and Jarmo Ropponen of the University of Jyväskylä in Finland; and Sami Nummelin of the University of Jyväskylä and Aalto University, both in Finland.

Research was funded by National Science Foundation-funded grants at the University of Pennsylvania and the University of Minnesota, as well as by the Academy of Finland, Temple University and the P. Roy Vagelos Chair at the University of Pennsylvania.

####

For more information, please click here

Contacts:
Media Contact:
Jordan Reese

215-573-6604

Copyright © University of Pennsylvania

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Renishaw receives Queen's Award for spectroscopy developments November 25th, 2014

JPK reports on the use of AFM and the CellHesion module to study plant cells at the University of Queensland November 25th, 2014

Vegetable oil ingredient key to destroying gastric disease bacteria: In mice, therapeutic nanoparticles dampen H. pylori bacteria and inflammation that lead to ulcers and gastric cancer November 25th, 2014

Research yields material made of single-atom layers that snap together like Legos November 25th, 2014

Synthetic Biology

New tool could help reshape the limits of synthetic biology: The 'telomerator' reshapes synthetic yeast chromosome into more flexible, realistic form, redefining what geneticists can build November 3rd, 2014

Tiny carbon nanotube pores make big impact October 29th, 2014

Smallest world record has 'endless possibilities' for bio-nanotechnology October 8th, 2014

Artificial Cells Act Like the Real Thing: Cell-like compartments produce proteins and communicate with one another, similar to natural biological systems August 18th, 2014

Govt.-Legislation/Regulation/Funding/Policy

Lawrence Livermore researchers develop efficient method to produce nanoporous metals November 25th, 2014

Renishaw receives Queen's Award for spectroscopy developments November 25th, 2014

Vegetable oil ingredient key to destroying gastric disease bacteria: In mice, therapeutic nanoparticles dampen H. pylori bacteria and inflammation that lead to ulcers and gastric cancer November 25th, 2014

Research yields material made of single-atom layers that snap together like Legos November 25th, 2014

Possible Futures

A novel method for identifying the body’s ‘noisiest’ networks November 19th, 2014

Researchers discern the shapes of high-order Brownian motions November 17th, 2014

VDMA Electronics Production Equipment: Growth track for 2014 and 2015 confirmed: Business climate survey shows robust industry sector November 14th, 2014

Open Materials Development Will Be Key for HP's Success in 3D Printing: HP can make a big splash in 3D printing, but it needs to shore up technology claims and avoid the temptation of the razor/razor blade business model in order to flourish November 11th, 2014

Academic/Education

SUNY Poly Student Awarded Fellowship with the U.S. Department of Energy's Postgraduate Research Program: Ph.D. Candidate Accepts Postmaster's Appointment To Conduct Research At Albany NanoTech Complex November 13th, 2014

SUNY Polytechnic Institute Hosts Massive Crowd of More Than 3,000 People Who Attended Community Day Activities Across New York State: CNSE’s ‘NANOvember’ kickoff event highlights New York State’s growing high-tech sector with open house events in Albany, Utica, and Rochester November 3rd, 2014

SUNY Polytechnic Institute Invites the Public to Attend its Popular Statewide 'NANOvember' Series of Outreach and Educational Events October 23rd, 2014

First Canada Excellence Research Chair gets $10 million from the federal government for oilsands research at the University of Calgary: Federal government announces prestigious research chair to study improving oil production efficiency October 19th, 2014

Self Assembly

Live Images from the Nano-cosmos: Researchers watch layers of football molecules grow November 5th, 2014

Outsmarting Thermodynamics in Self-assembly of Nanostructures: Berkeley Lab reports method for symmetry-breaking in feedback-driven self-assembly of optical metamaterials November 4th, 2014

NYU Researchers Break Nano Barrier to Engineer the First Protein Microfiber October 23rd, 2014

NIST offers electronics industry 2 ways to snoop on self-organizing molecules October 22nd, 2014

Nanomedicine

Vegetable oil ingredient key to destroying gastric disease bacteria: In mice, therapeutic nanoparticles dampen H. pylori bacteria and inflammation that lead to ulcers and gastric cancer November 25th, 2014

Research reveals how our bodies keep unwelcome visitors out of cell nuclei November 24th, 2014

ASU, IBM move ultrafast, low-cost DNA sequencing technology a step closer to reality November 24th, 2014

An Inside Job: UC-Designed Nanoparticles Infiltrate, Kill Cancer Cells From Within November 24th, 2014

Announcements

Renishaw receives Queen's Award for spectroscopy developments November 25th, 2014

JPK reports on the use of AFM and the CellHesion module to study plant cells at the University of Queensland November 25th, 2014

Vegetable oil ingredient key to destroying gastric disease bacteria: In mice, therapeutic nanoparticles dampen H. pylori bacteria and inflammation that lead to ulcers and gastric cancer November 25th, 2014

Research yields material made of single-atom layers that snap together like Legos November 25th, 2014

Personal Care

Sunblock poses potential hazard to sea life August 20th, 2014

AQUANOVA receives Technology Leadership Award 2014 FROST & SULLIVAN honors NovaSOL® Technology again August 12th, 2014

Nanotechnology used in sunscreens: a Mexican achievement May 14th, 2014

Production of Nanocapsule from Sea-Buckthorn Extract in Iran May 3rd, 2014

Safety-Nanoparticles/Risk management

Sustainable Nanotechnologies Project November 20th, 2014

A gut reaction November 19th, 2014

Nanosafety research – there’s room for improvement October 29th, 2014

Plastic nanoparticles also harm freshwater organisms October 18th, 2014

Nanobiotechnology

Quantum mechanical calculations reveal the hidden states of enzyme active sites November 20th, 2014

Tokyo Institute of Technology research: Protein-engineered cages aid studies of cell functions November 19th, 2014

A novel method for identifying the body’s ‘noisiest’ networks November 19th, 2014

Implementation of DNA Chains in Designing Nanospin Pieces November 9th, 2014

Research partnerships

Lawrence Livermore researchers develop efficient method to produce nanoporous metals November 25th, 2014

Vegetable oil ingredient key to destroying gastric disease bacteria: In mice, therapeutic nanoparticles dampen H. pylori bacteria and inflammation that lead to ulcers and gastric cancer November 25th, 2014

Characterization of X-ray flashes open new perspectives in X-ray science: Ultra-short X-ray pulses explore the nano world November 24th, 2014

Research reveals how our bodies keep unwelcome visitors out of cell nuclei November 24th, 2014

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More












ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE