Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Attacking a rare disease at its source with gene therapy

27.08.2014

Penn proof-of-principle animal study reduces harmful accumulation of proteins in lysosomal storage disease

Treating the rare disease MPS I is a challenge. MPS I, caused by the deficiency of a key enzyme called IDUA, eventually leads to the abnormal accumulation of certain molecules and cell death.

The two main treatments for MPS I are bone marrow transplantation and intravenous enzyme replacement therapy, but these are only marginally effective or clinically impractical, especially when the disease strikes the central nervous system (CNS). Using an animal model, a team from the Perelman School of Medicine at the University of Pennsylvania has proven the efficacy of a more elegant way to restore IDUA levels in the body through direct gene transfer. Their work was published this week online in Molecular Therapy.

"The study provides a strong proof-of-principle for the efficacy and practicality of intrathecal delivery of gene therapy for MPS patients," said lead author James M. Wilson, MD, PhD, professor of Pathology and Laboratory Medicine and director of the Penn Gene Therapy Program. "This first demonstration will pave the way for gene therapies to be translated into the clinic for lysosomal storage diseases."

... more about:
»Attacking »CNS »CSF »Health »MPS »Medicine »Wilson »blood »diseases »enzyme »vector

This family of diseases comprises about 50 rare inherited disorders marked by defects in the lysosomes, compartments within cells filled with enzymes to digest large molecules. If one of these enzymes is mutated, molecules that would normally be degraded by the lysosome accumulate within the cell and their fragments are not recycled. Many of the MPS disorders can share symptoms, such as speech and hearing problems, hernias, and heart problems. Patient groups estimate that in the United States 1 in 25,000 births will result in some form of MPS. Life expectancy varies significantly for people with MPS I. Individuals with the most severe form rarely live more than 10 years.

The team used an adeno-associated viral (AAV) vector to introduce normal IDUA to glial and neuronal cells of the brain and spinal cord in a feline model. Their aim was to treat the CNS manifestations of MPS at the source. After a single injection of the AAV9 vector expressing a normal feline IDUA gene sequence and various promoters, the investigators collected blood serum and cerebrospinal fluid (CSF) samples from the test animals and from untreated controls

Some of the treated animals displayed a sharp decline in IDUA levels in the CSF after an initial elevation in the enzyme, which the researchers attribute to an antibody response against IDUA. However, IDUA still persisted at a level sufficient to elicit a positive therapeutic response.

The team also found that one CSF enzyme was elevated in the presence of MPS and propose it could be used as a biomarker for disease activity. All the treated animals displayed a marked decrease in this enzyme, confirming a definite biochemical response to the introduction of the gene vector.

Tissue samples from the brain and spinal cord showed widespread presence of the AAV9 vector throughout all regions of the CNS. IDUA deficiency in the CNS caused by MPS1 results in the accumulation of cholesterol and lipids called gangliosides in brain tissue and accumulation of the sugar glycosaminoglycan in connective tissue and cerebral blood vessels. The animals treated with the AAV9-IDUA vector displayed an almost complete reversal of these molecular markers of MPS.

"Signs of MPS were also virtually completely corrected in the liver and spleen," notes Wilson.

Even with a possible antibody response, conclude the researchers, a single injection nearly reversed all evidence of MPS pathology in the CNS of the treated animals. Next steps could include possible human trials and the expansion of this therapeutic approach to other lysosomal diseases that attack CNS cells.

###

Co-authors also included Mark E. Haskins from Penn School of Veterinary Medicine. This work was funded by NIH grants P40-OD010939 and DK25759 and ReGenX BioSciences, LLC, a Washington, D.C.-based biotech firm that holds licenses in technology used in this study.

Editor's Note:

J.M. Wilson is an advisor to ReGenX Biosciences and Dimension Therapeutics , and is a founder of, holds equity in, and receives grants from ReGenX Biosciences and Dimension Therapeutics; in addition, he is a founder, consultant and advisor to several other biopharmaceutical companies and is an inventor on patents licensed to various biopharmaceutical companies.

Penn Medicine is one of the world's leading academic medical centers, dedicated to the related missions of medical education, biomedical research, and excellence in patient care. Penn Medicine consists of the Raymond and Ruth Perelman School of Medicine at the University of Pennsylvania (founded in 1765 as the nation's first medical school) and the University of Pennsylvania Health System, which together form a $4.3 billion enterprise.

The Perelman School of Medicine has been ranked among the top five medical schools in the United States for the past 17 years, according to U.S. News & World Report's survey of research-oriented medical schools. The School is consistently among the nation's top recipients of funding from the National Institutes of Health, with $392 million awarded in the 2013 fiscal year.

The University of Pennsylvania Health System's patient care facilities include: The Hospital of the University of Pennsylvania -- recognized as one of the nation's top "Honor Roll" hospitals by U.S. News & World Report; Penn Presbyterian Medical Center; Chester County Hospital; Penn Wissahickon Hospice; and Pennsylvania Hospital -- the nation's first hospital, founded in 1751. Additional affiliated inpatient care facilities and services throughout the Philadelphia region include Chestnut Hill Hospital and Good Shepherd Penn Partners, a partnership between Good Shepherd Rehabilitation Network and Penn Medicine.

Penn Medicine is committed to improving lives and health through a variety of community-based programs and activities. In fiscal year 2013, Penn Medicine provided $814 million to benefit our community.

Karen Kreeger | Eurek Alert!
Further information:
http://www.uphs.upenn.edu

Further reports about: Attacking CNS CSF Health MPS Medicine Wilson blood diseases enzyme vector

More articles from Life Sciences:

nachricht HKUST researchers discover ways to regenerate corticospinal tract axons
06.07.2015 | Hong Kong University of Science and Technology

nachricht Southampton researchers go with the flow to help protect endangered European eel
06.07.2015 | University of Southampton

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Viaducts with wind turbines, the new renewable energy source

Wind turbines could be installed under some of the biggest bridges on the road network to produce electricity. So it is confirmed by calculations carried out by a European researchers team, that have taken a viaduct in the Canary Islands as a reference. This concept could be applied in heavily built-up territories or natural areas with new constructions limitations.

The Juncal Viaduct, in Gran Canaria, has served as a reference for Spanish and British researchers to verify that the wind blowing between the pillars on this...

Im Focus: X-rays and electrons join forces to map catalytic reactions in real-time

New technique combines electron microscopy and synchrotron X-rays to track chemical reactions under real operating conditions

A new technique pioneered at the U.S. Department of Energy's Brookhaven National Laboratory reveals atomic-scale changes during catalytic reactions in real...

Im Focus: Iron: A biological element?

Think of an object made of iron: An I-beam, a car frame, a nail. Now imagine that half of the iron in that object owes its existence to bacteria living two and a half billion years ago.

Think of an object made of iron: An I-beam, a car frame, a nail. Now imagine that half of the iron in that object owes its existence to bacteria living two and...

Im Focus: Thousands of Droplets for Diagnostics

Researchers develop new method enabling DNA molecules to be counted in just 30 minutes

A team of scientists including PhD student Friedrich Schuler from the Laboratory of MEMS Applications at the Department of Microsystems Engineering (IMTEK) of...

Im Focus: Bionic eye clinical trial results show long-term safety, efficacy vision-restoring implant

Patients using Argus II experienced significant improvement in visual function and quality of life

The three-year clinical trial results of the retinal implant popularly known as the "bionic eye," have proven the long-term efficacy, safety and reliability of...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

World Conference on Regenerative Medicine in Leipzig: Last chance to submit abstracts until 2 July

25.06.2015 | Event News

World Conference on Regenerative Medicine: Abstract Submission has been extended to 24 June

16.06.2015 | Event News

MUSE hosting Europe’s largest science communication conference

11.06.2015 | Event News

 
Latest News

Aluminum Clusters Shut Down Molecular Fuel Factory

06.07.2015 | Power and Electrical Engineering

Veja Mate Offshore orders 67 wind turbines including record long-term service

06.07.2015 | Press release

The quantum middle man

06.07.2015 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>