Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Biodegradable Nanoparticles Can Bypass Mucus Barrier and Release Drugs Over Time

This biodegradable nanoparticle developed by the Justin Hanes Lab at Johns Hopkins University is shown here at microscale for easier viewing. The particle displays its polymer coating as a red fluorescent glow. Hanes' biodegradable nanoparticles have the ability to penetrate mucus barriers in the body to deliver drugs. Photo by Jie Fu/Johns Hopkins University.
This biodegradable nanoparticle developed by the Justin Hanes Lab at Johns Hopkins University is shown here at microscale for easier viewing. The particle displays its polymer coating as a red fluorescent glow. Hanes' biodegradable nanoparticles have the ability to penetrate mucus barriers in the body to deliver drugs. Photo by Jie Fu/Johns Hopkins University.

Abstract:
Johns Hopkins University researchers have created biodegradable nanosized particles that can easily slip through the body's sticky and viscous mucus secretions to deliver a sustained-release medication cargo. The researchers say these nanoparticles, which degrade over time into harmless components, could one day carry life-saving drugs to patients suffering from dozens of health conditions, including diseases of the eye, lung, gut or female reproductive tract.

Biodegradable Nanoparticles Can Bypass Mucus Barrier and Release Drugs Over Time

Baltimore, MD | Posted on January 5th, 2010

The mucus-penetrating biodegradable nanoparticles were developed by an interdisciplinary team led by Justin Hanes, then a professor of chemical and biomolecular engineering in the Whiting School of Engineering at Johns Hopkins. The team's work was reported recently in the Proceedings of the National Academy of Sciences. Hanes, now with the Department of Ophthalmology in the Johns Hopkins School of Medicine, worked with collaborators who included cystic fibrosis expert Pamela Zeitlin, a professor of pediatrics at the School of Medicine and director of pediatric pulmonary medicine at Johns Hopkins Children's Center.

These nanoparticles, Zeitlin said, could be an ideal means of delivering drugs to people with cystic fibrosis, a disease that kills children and adults by altering the mucus barriers in the lung and gut. "Cystic fibrosis mucus is notoriously thick and sticky and represents a huge barrier to aerosolized drug delivery," she said. "In our study, the nanoparticles were engineered to travel through cystic fibrosis mucus at a much greater velocity than ever before, thereby improving drug delivery. This work is critically important to moving forward with the next generation of small molecule and gene-based therapies."

Beyond their potential applications for cystic fibrosis patients, the nanoparticles also could be used to help treat disorders such as lung and cervical cancer, and inflammation of the sinuses, eyes, lungs and gastrointestinal tract, said Benjamin C. Tang, lead author of the recent journal article and a postdoctoral fellow in the Department of Chemical and Biomolecular Engineering. "Chemotherapy is typically given to the whole body and has many undesired side effects. If drugs are encapsulated in these nanoparticles and inhaled directly into the lungs of lung cancer patients, drugs may reach lung tumors more effectively, and improved outcomes may be achieved, especially for patients diagnosed with early stage non-small cell lung cancer."

In the lungs, eyes, gastrointestinal tract and other areas, the human body produces layers of mucus to protect sensitive tissue. But an undesirable side effect is that these mucus barriers can also keep helpful medications away.

In proof-of-concept experiments, previous research teams led by Hanes earlier demonstrated that latex particles coated with polyethylene glycol could slip past mucus coatings. But latex particles are not a practical material for delivering medication to human patients because they are not broken down by the body. In the new study, the researchers described how they took an important step forward in making new particles that biodegrade into harmless components while delivering their drug payload over time.

"The major advance here is that we were able make biodegradable nanoparticles that can rapidly penetrate thick and sticky mucus secretions, and that these particles can transport a wide range of therapeutic molecules, from small molecules such as chemotherapeutics and steroids to macromolecules such as proteins and nucleic acids," Hanes said. "Previously, we could not get these kinds of sustained-release treatments through the body's sticky mucus layers effectively."

The new biodegradable particles comprise two parts made of molecules routinely used in existing medications. An inner core, composed largely of polysebacic acid (PSA), traps therapeutic agents inside. A particularly dense outer coating of polyethylene glycol (PEG) molecules, which are linked to PSA, allows a particle to move through mucus nearly as easily as if it were moving through water and also permits the drug to remain in contact with affected tissues for an extended period of time.

In Hanes' previous studies with mucus-penetrating particles, latex particles could be effectively coated with PEG but could not release drugs or biodegrade. Unlike latex, however, PSA can degrade into naturally-occurring molecules that are broken down and flushed away by the body through the kidney, for example. As the particles break down, the drugs loaded inside are released.

This property of PSA enables the sustained release of drugs, said Samuel Lai, assistant research professor in the Department of Chemical and Biomolecular Engineering, while designing them for mucus penetration allows them to more readily reach inaccessible tissues.

Jie Fu, an assistant research professor, also from the Department of Chemical and Biomolecular Engineering, said, "As it degrades, the PSA comes off along with the drug over a controlled amount of time that can reach days to weeks."

Polyethylene glycol acts as a shield to protect the particles from interacting with proteins in mucus that would cause them to be cleared before releasing their contents. In a related research report, the group showed that the particles can efficiently encapsulate several chemotherapeutics, and that a single dose of drug-loaded particles was able to limit tumor growth in a mouse model of lung cancer for up to 20 days.

Hanes, Zeitlin, Lai and Fu are all affiliated with Johns Hopkins Institute for NanoBioTechnology. Other authors on the paper are Ying-Ying Wang, Jung Soo Suk, and Ming Yang, doctoral students in the Johns Hopkins Department of Biomedical Engineering; Michael P. Boyle, an associate professor in Pulmonary and Critical Care Medicine at the Johns Hopkins School of Medicine; and Michelle Dawson, an assistant professor at the Georgia Institute of Technology.

This work was supported in part by funding from the National Institutes of Health, a National Center for Research Resources Clinical and Translational Science Award, the Cystic Fibrosis Foundation, the National Science Foundation and a Croucher Foundation Fellowship.

The technology described in the journal article is protected by patents managed by the Johns Hopkins Technology Transfer office and is licensed exclusively by Kala Pharmaceuticals. Justin Hanes is a paid consultant to Kala Pharmaceuticals, a startup company in which he holds equity, and is currently a member of its board. The terms of these arrangements are being managed by The Johns Hopkins University in accordance with its conflict-of-interest policies.

The Proceedings of the National Academy of Sciences journal article can be viewed at:
www.pnas.org/content/106/46/19268.full.pdf

Related links:

Justin Hanes Group Website: www.jhu.edu/chembe/hanes/index.html
Pamela Zeitlin Group Website: www.hopkinscf.org/
Johns Hopkins Institute for NanoBioTechnology: inbt.jhu.edu
Johns Hopkins Department of Chemical and Biomolecular Engineering: www.jhu.edu/chembe/

####

About Johns Hopkins
The Johns Hopkins University opened in 1876, with the inauguration of its first president, Daniel Coit Gilman. "What are we aiming at?" Gilman asked in his installation address. "The encouragement of research ... and the advancement of individual scholars, who by their excellence will advance the sciences they pursue, and the society where they dwell."

The mission laid out by Gilman remains the university's mission today, summed up in a simple but powerful restatement of Gilman's own words: "Knowledge for the world."

For more information, please click here

Contacts:
Mary Spiro
(410) 516-4802

Copyright © Johns Hopkins

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

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

Instant-start computers possible with new breakthrough December 19th, 2014

Aculon Hires New Business Development Director December 19th, 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

Nanomedicine

Creation of 'Rocker' protein opens way for new smart molecules in medicine, other fields December 18th, 2014

Iranian Researchers Produce Electrical Pieces Usable in Human Body December 18th, 2014

Unraveling the light of fireflies December 17th, 2014

First Home-Made Edible Herbal Nanodrug Presented to Pharmacies across Iran December 17th, 2014

Announcements

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

Instant-start computers possible with new breakthrough December 19th, 2014

Aculon Hires New Business Development Director December 19th, 2014

Nanobiotechnology

Scientists trace nanoparticles from plants to caterpillars: Rice University study examines how nanoparticles behave in food chain December 16th, 2014

FEI and Oregon Health & Science University Install a Complete Correlative Microscopy Workflow in Newly Built Collaborative Science Facility December 16th, 2014

UCLA engineers first to detect and measure individual DNA molecules using smartphone microscope December 15th, 2014

Biomimetic dew harvesters: Understanding how a desert beetle harvests water from dew could improve drinking water collection in dew condensers December 8th, 2014

Alliances/Partnerships/Distributorships

SUNY Poly NanoCollege Faculty Member Selected as American Physical Society Fellow: SUNY Poly Associate Professor of Nanoscience Dr. Vincent LaBella Recognized for Significant Technological Innovations that Enable Interactive Learning December 17th, 2014

New 'electronic skin' for prosthetics, robotics detects pressure from different directions December 10th, 2014

SEMATECH Reports Significant Progress in EUV Resist Outgas Testing: Technologists from SEMATECH and JSR demonstrate outgas test results that further enable EUV lithography for high-volume manufacturing readiness December 3rd, 2014

Toward a low-cost 'artificial leaf' that produces clean hydrogen fuel December 3rd, 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