Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Delivery system for gene therapy may help treat arthritis

Drs. Andrew L. Mellor and Lei Huang at Georgia Health Sciences University have shown a system called DNA nanoparticles, used to deliver genes or drugs directly into cells to treat a variety of diseases, may help arthritis without delivering anything.

Credit: Phil Jones, GHSU Photographer
Drs. Andrew L. Mellor and Lei Huang at Georgia Health Sciences University have shown a system called DNA nanoparticles, used to deliver genes or drugs directly into cells to treat a variety of diseases, may help arthritis without delivering anything.

Credit: Phil Jones, GHSU Photographer

Abstract:
A DNA-covered submicroscopic bead used to deliver genes or drugs directly into cells to treat disease appears to have therapeutic value just by showing up, researchers report.

Delivery system for gene therapy may help treat arthritis

Augusta, GA | Posted on May 14th, 2012

Within a few hours of injecting empty-handed DNA nanoparticles, Georgia Health Sciences University researchers were surprised to see increased expression of an enzyme that calms the immune response.

In an animal model of rheumatoid arthritis, the enhanced expression of indoleomine 2,3 dioxygenase, or IDO, significantly reduced the hallmark limb joint swelling and inflammation of this debilitating autoimmune disease, researchers report in the study featured on the cover of The Journal of Immunology.

"It's like pouring water on a fire," said Dr. Andrew L. Mellor, Director of the GHSU's Medical College of Georgia Immunotherapy Center and the study's corresponding author. "The fire is burning down the house, which in this case is the tissue normally required for your joints to work smoothly," Mellor said of the immune system's inexplicable attack on bone-cushioning cartilage. "When IDO levels are high, there is more water to control the fire."

Several delivery systems are used for gene therapy, which is used to treat conditions including cancer, HIV infection and Parkinson's disease. The new findings suggest the DNA nanoparticle technique has value as well for autoimmune diseases such as arthritis, type 1 diabetes and lupus. "We want to induce IDO because it protects healthy tissue from destruction by the immune system," Mellor said.

The researchers were exploring IDO's autoimmune treatment potential by inserting the human IDO gene into DNA nanoparticles. They hoped to enhance IDO expression in their arthritis model when Dr. Lei Huang, Assistant Research Scientist and the paper's first author, serendipitously found that the DNA nanoparticle itself produced the desired result. Exactly how and why is still being pursued. Early evidence suggests that immune cells called phagocytes, white blood cells that gobble up undesirables like bacteria and dying cells, start making more IDO in response to the DNA nanoparticle's arrival. "Phagocytes eat it and respond quickly to it and the effect we measure is IDO," Mellor said.

Dr. Tracy L. McGaha, GHSU immunologist and a co-author on the current study, recently discovered that similar cells also prevented development of systemic lupus erythematosus in mice.

Follow-up studies include documenting all cells that respond by producing more IDO. GHSU researchers already are working with biopolymer experts at the Massachusetts Institute of Technology, the University of California, Berkeley and the Georgia Institute of Technology to identify the optimal polymer.

The polymer used in the study is not biodegradable so the researchers need one that will eventually safely degrade in the body. Ideally, they'd also like it to target specific cells, such as those near inflamed joints, to minimize any potential ill effects.

"It's like a bead and you wrap the DNA around it," Mellor said of the polymer. While the DNA does not have to carry anything to get the desired response in this case, DNA itself is essential to make cells express IDO. To ensure that IDO expression was responsible for the improvements, they also performed experiments in mice given an IDO inhibitor in their drinking water and in mice genetically altered to not express IDO. "Without access to the IDO pathway, the therapy no longer works," Mellor said.

Drs. Andrew Mellor and David Munn reported in 1998 in the journal Science that the fetus expresses IDO to help avoid rejection by the mother's immune system. Subsequent studies have shown tumors also use IDO for protection and clinical trials are studying the tumor-fighting potential of an IDO inhibitor. On the flip side, there is evidence that increasing IDO expression can protect transplanted organs and counter autoimmune disease.

Mellor is the Bradley-Turner and Georgia Research Alliance Eminent Scholar in Molecular Immunogenetics at MCG. The research was funded by the Carlos and Marguerite Mason Trust and the National Institutes of Health and a patent is pending on the findings.

####

For more information, please click here

Contacts:
Toni Baker

706-721-4421

Copyright © Georgia Health Sciences University

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

NREL Announces New Center Directors to lead R&D, Analysis Efforts September 30th, 2014

Yale University and Leica Microsystems Partner to Establish Microscopy Center of Excellence: Yale Welcomes Scientists to Participate in Core Facility Opening and Super- Resolution Workshops October 20 Through 31, 2014 September 30th, 2014

Speed at its limits September 30th, 2014

Research mimics brain cells to boost memory power September 30th, 2014

Govt.-Legislation/Regulation/Funding/Policy

NREL Announces New Center Directors to lead R&D, Analysis Efforts September 30th, 2014

A Heartbeat Away? Hybrid "Patch" Could Replace Transplants: TAU researcher harnesses gold nanoparticles to engineer novel biocompatible cardiac patch September 30th, 2014

How things coil: Researchers discover that simulation technology designed for Hollywood can be used as a predictive tool for understanding fundamental engineering problems September 29th, 2014

UT Arlington researchers develop transparent nanoscintillators for radiation detection for medical safety and homeland security September 29th, 2014

Nanomedicine

Speed at its limits September 30th, 2014

Ad-REIC vaccine: A magic bullet for cancer treatment September 30th, 2014

New Topical Hemostatic Agent: Neutral Self-Assembling Peptide Hydrogel September 30th, 2014

A Heartbeat Away? Hybrid "Patch" Could Replace Transplants: TAU researcher harnesses gold nanoparticles to engineer novel biocompatible cardiac patch September 30th, 2014

Discoveries

Research mimics brain cells to boost memory power September 30th, 2014

Ad-REIC vaccine: A magic bullet for cancer treatment September 30th, 2014

New Topical Hemostatic Agent: Neutral Self-Assembling Peptide Hydrogel September 30th, 2014

Chemical interactions between silver nanoparticles and thiols: A comparison of mercaptohexanol again September 30th, 2014

Announcements

Park Systems Announces Outsourced Analytical Services Including AFM Surface Imaging, Data Analysis and Interpretation September 30th, 2014

Ad-REIC vaccine: A magic bullet for cancer treatment September 30th, 2014

New Topical Hemostatic Agent: Neutral Self-Assembling Peptide Hydrogel September 30th, 2014

Chemical interactions between silver nanoparticles and thiols: A comparison of mercaptohexanol again September 30th, 2014

Patents/IP/Tech Transfer/Licensing

‘Small’ transformation yields big changes September 16th, 2014

Berkeley Lab Licenses Boron Nitride Nanotube Technology: New material has unique mechanical and electronic properties September 13th, 2014

Secure Computing for the ‘Everyman': Quantum computing goes to market in tech transfer agreement with Allied Minds September 2nd, 2014

New analytical technology reveals 'nanomechanical' surface traits August 29th, 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