A team at Texas A&M developed a nontoxic animal model based on infection with Theiler's murine encephalomyelitis virus (TMEV). The model produced brain cell loss and physical disabilities similar to those seen in people with Parkinson's disease. The researchers noted that many animal models use genetic changes or toxic chemicals, which may not reflect how Parkinson's begins in people.
The study measured infection, motor skills and gait. One key result was that the virus entered dopamine-producing brain cells and later those cells were destroyed at the infection site. Infected models were slower on the pole test and showed persistent differences through the end of the study.
Future work will compare the TMEV model with standard models, search for early markers and study how immune responses to viruses change the brain. The study is published in Brain, Behavior, and Immunity-Health and was supported by the National Institute for Neurological Disorders and Stroke and a Texas A&M Graduate Trainee Grant.
Difficult words
- nontoxic — not harmful or poisonous to living things
- infection — entry and growth of a virus or bacteria
- dopamine-producing — making the brain chemical dopamine
- gait — way a person or animal walks
- persistent — continuing for a long time
- immune response — how the body reacts to an infectionimmune responses
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Discussion questions
- What are the benefits of using a nontoxic infection model instead of models with toxic chemicals?
- How could finding early markers change diagnosis or treatment for people with Parkinson's disease?
- How might studying immune responses to viruses help researchers understand changes in the brain?
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