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Saturday, August 23, 2014

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Drug rescues memory lost to Alzheimer's disease

Study in mice finds oral therapy helps prevent neuron damage

— Irvine, Calif., July 14, 2009 —

A drug similar to one used in clinical trials for treatment of rheumatoid arthritis and psoriasis has been found to rescue memory in mice exhibiting Alzheimer's symptoms.

The discovery by UC Irvine scientists offers hope that a new treatment may be on the horizon for people in the early stages of Alzheimer's, the leading cause of elderly dementia afflicting more than 5 million people in the U.S. and for which no cure exists.

The drug, called PMX205, prevented inflamed immune cells from gathering in brain regions with Alzheimer's lesions called amyloid plaques. Cell inflammation in these areas accelerates neuron damage, exacerbating the disease.

"We used a multidisciplinary approach combining an understanding of immunology and neurobiology to uncover a completely different target than other therapies," said Andrea Tenner, lead author of the study that led to the findings and a molecular biology & biochemistry professor at UCI.

Study results are reported in the July 15 edition of The Journal of Immunology.

For 12 weeks, Tenner and colleagues added PMX205 to the drinking water of mice genetically altered to develop age-related Alzheimer's-like symptoms. The treatment occurred at an age when plaques were accumulating in their brains.

Scientists gave the treated mice learning and memory tests and then examined their brains for evidence of the disease. Alzheimer's mice that were not given the drug performed significantly worse on the test than normal mice. But - in all but one case - the treated Alzheimer's mice performed almost as well as the normal mice. Those with the rescued cognitive ability had more than 50 percent fewer Alzheimer's lesions and inflammatory immune cells than the untreated diseased mice.

PMX53, a similar drug that can be taken orally, passed Phase 1 human clinical trials for safety with no major problems reported. Possible side effects include an increased susceptibility to some infections. PMX205 is a modified version that may be more potent for treatment of brain disorders.

"This approach may work even better if combined with treatments targeting other problems in the Alzheimer's brain," said Tenner, also a professor of pathology and neurobiology & behavior, as well as a member of UCI's Institute for Immunology and Institute for Memory Impairments and Neurological Disorders, or UCI MIND.

In addition to Tenner, UCI graduate student Rahasson Ager and senior researcher Marisa Fonseca worked on this study. They collaborated with Australian scientists Trent Woodruff and Steve Taylor, who demonstrated the drug's effectiveness in rat models of other diseases.

The research was supported by the National Institutes of Health and the National Health and Medical Research Council of Australia.

University of California, Irvine: Founded in 1965, UCI is a top-ranked university dedicated to research, scholarship and community service. Led by Chancellor Michael Drake since 2005, UCI is among the fastest-growing University of California campuses, with more than 27,000 undergraduate and graduate students, 1,100 faculty and 9,200 staff. The top employer in dynamic Orange County, UCI contributes an annual economic impact of $4.2 billion. For more UCI news, visit http://today.uci.edu/.

News Radio: UCI maintains on campus an ISDN line for conducting interviews with its faculty and experts. Use of this line is available for a fee to radio news programs/stations that wish to interview UCI faculty and experts. Use of the ISDN line is subject to availability and approval by the university.

Andrea Tenner
Andrea Tenner and colleagues identified a drug that reduces damaging inflamed immune cells (red, background) and Alzheimer's lesions called amyloid plaques (green, background) from gathering in brains of mice, preventing the loss of cognitive abilities.
Photo by Daniel A. Anderson / University Communications

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University Communications
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clawhon@uci.edu

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