Related Experiment Videos
Methylphenidate alleviates manganese-induced impulsivity but not distractibility
Stephane A Beaudin1, Barbara J Strupp2, Walter Uribe1
1Department of Microbiology and Environmental Toxicology, University of California, Santa Cruz, CA 95064, USA.
Neurotoxicology and Teratology
|April 2, 2017
Summary
Postnatal manganese (Mn) exposure causes attention and impulse control deficits. Methylphenidate (MPH) improved impulse control but not selective attention in Mn-exposed rats.
Area of Science:
- Neuroscience
- Developmental Toxicology
- Behavioral Pharmacology
Background:
- Postnatal manganese (Mn) exposure in rodents leads to persistent deficits in fine motor control and attention.
- Oral methylphenidate (MPH) has shown efficacy in treating motor control impairments caused by Mn exposure.
- The impact of MPH on attention deficits resulting from developmental Mn exposure remains largely unknown.
Purpose of the Study:
- To investigate if oral MPH can ameliorate attention and impulse control deficits induced by postnatal Mn exposure in rats.
- To examine the effects of MPH treatment on neuronal dendritic spine density in the medial prefrontal cortex (mPFC) and dorsal striatum following Mn exposure.
- To understand how Mn exposure alters brain function and behavior, and the potential therapeutic role of MPH.
Main Methods:
- Rodents were exposed to manganese (50 Mn/kg/d) or a control diet from PND 1.
- Young adult rats were tested on attention tasks assessing selective attention and impulse control.
- Animals received oral methylphenidate (2.5 mg/kg/d) during behavioral testing.
- Neuronal dendritic spine density was analyzed in the mPFC and dorsal striatum.
Main Results:
- Lifelong postnatal Mn exposure resulted in impaired impulse control and selective attention in adulthood.
- Oral MPH treatment alleviated Mn-induced impulse control deficits but did not improve selective attention.
- MPH administration impaired focused attention in Mn-exposed rats and had differential effects on behavior and neuroanatomy compared to controls.
- Mn exposure altered catecholaminergic systems, impacting behaviors and dendritic spine density in the mPFC.
Conclusions:
- Developmental manganese exposure causes lasting attention and impulse control deficits.
- Therapeutically relevant doses of MPH show potential for treating impulse control issues in Mn-exposed individuals.
- Further research with varied MPH doses is necessary to optimize treatment for both impulse control and selective attention deficits without adverse effects on focused attention.