PENN STATE (US) — Giving low doses of Ritalin to iron deficient adolescent rats appears to improve brain function, a finding that may have implications for iron-deficient human infants as well.
Higher doses proved to hurt rather than help the control animals’ focus, making them hyperactive. Control rats that were not iron deficient but received low doses of Ritalin showed no positive or negative change in performance.
When children are deprived of iron at any point during the last trimester of pregnancy or the first six months of life—a critical period of brain development—they suffer brain damage at least through early adulthood, and possibly beyond. In particular, their motor function can be impaired as well as their ability to focus.
Iron deficiency ranks in the top 10 causes of global disease and affects more than 2 billion children, who exhibit attention problems, attachment issues, and motor problems, says Byron Jones, professor of biobehavioral health at Penn State.
For the study, reported in the journal Behavioural Brain Research, iron-deficient adolescent rats were treated with methylphenidate, commonly known as Ritalin, to see if the drug would help the animals overcome the deficit.
“Most of the research community knows that iron deficiency has a major hit on dopamine systems,” Jones says. “Why hasn’t anybody tried a dopamine drug to repair or at least rescue some of what’s lost?”
Ritalin is a drug that helps regulate levels of dopamine in the brain. Most often it is prescribed to patients with attention-deficit/hyperactivity disorder. Dopamine is important in controlling many important functions of the brain, like being able to sustain attention and shift it.
Half the rats in the test group were made iron deficient beginning four days after birth, mimicking a human infant deprived of iron during brain development. Once weaned, the rats were put on iron-sufficient diets.
At 45 days, when the rats reached adolescence, testing was conducted to see if the rats’ ability to remember, respond, sustain attention and then shift attention.
For every test, they gave the rats two different bowls to dig in. In each case only one bowl contained food, but the bowls were filled with either coarse or fine gravel. Before receiving any Ritalin, each rat had time to explore the bowls and find the food.
The rats were then broken into four groups, with control and iron-deficient rats in all four groups. One group serving as the control, received no Ritalin. The other three groups were given different amounts of Ritalin. After 15 days on the medication, the rats were retested, seeing if they could find the food in either filler. The test was complicated by the addition of either mint or strawberry scents.
“Ritalin may not be the best drug—but it’s shown that we can in fact treat some of the effects” of early-life iron deficiency, Jones says.
“We’re looking now to see if in fact their brains are going to show any recovery, but there’s no evidence so far in terms of (recovery of) the dopamine receptors.”
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