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Updated: Apr 19, 2026
Functional Neuroimaging Using Ultrasonic Blood-brain Barrier Disruption and Manganese-enhanced MRI
Published on: July 12, 2012
Investigation of the pruritus-induced functional activity in the rat brain using manganese-enhanced MRI
Keun-Yeong Jeong1, Ji-Hyuk Kang2
1Gachon Institute of Pharmaceutical Science, Gachon University, Incheon, Republic of Korea.
Purpose:
To provide clear information on the activation regions of itching, we investigated the functional activity of cerebral regions in the pruritus-induced rat model using manganese-enhanced magnetic resonance imaging (MEMRI).
Materials And Methods:
Itching was induced via neonatal capsaicin treatment in Sprague-Dawley rats (itching rats), and scratching behavior of the control, itching, and gabapentin (GBP)-treated itching rats was compared. Then the activated or deactivated brain regions were investigated in the control, itching, and GBP-treated itching rats using a 4.7T MRI system.
Results:
While the itching rats engaged in vigorous scratching (121.2 ± 22.4 times), the scratching behavior was decreased in the GBP-treated itching rats (30.6 ± 8.8 times). GBP induced the attenuation of functional activity in two regions -7.10 mm from bregma, in one region -6.65 mm from bregma, and in one region -6.06 mm from bregma. The brain regions related to itching were as follows: parafascicular nucleus, thalamus, superior/inferior colliculus, periaqueductal gray, cingulate cortex, amygdala, midbrain regions, lateral habenula, and hypothalamic areas.
Conclusion:
Our MEMRI investigation indicates new functional activity of cerebral regions in rats due to the effect of itching or GBP. This information could be used to monitor the therapeutic effects of novel agents or for clinical strategies to treat pathological itch.
Insights
This study used manganese-enhanced magnetic resonance imaging (MEMRI) to map brain activity during itching in rats. Gabapentin (GBP) treatment reduced scratching and altered functional activity in specific brain regions, offering insights into itch pathways.
Area of Science:
- Neuroscience
- Medical Imaging
- Pharmacology
Background:
- Pruritus, or itching, is a complex sensation with poorly understood central nervous system mechanisms.
- Investigating the neural correlates of itching is crucial for developing effective treatments for chronic itch conditions.
Purpose of the Study:
- To elucidate the functional activity of cerebral regions involved in itch using manganese-enhanced magnetic resonance imaging (MEMRI).
- To investigate the effects of gabapentin (GBP) on brain activation patterns in a rat model of pruritus.
Main Methods:
- Itching was induced in Sprague-Dawley rats using neonatal capsaicin treatment.
- Scratching behavior was quantified in control, itching, and GBP-treated rats.
- Manganese-enhanced magnetic resonance imaging (MEMRI) at 4.7T was employed to map activated/deactivated brain regions.
Main Results:
- Itching rats exhibited significantly more scratching behavior (121.2 ± 22.4 times) compared to GBP-treated rats (30.6 ± 8.8 times).
- Gabapentin (GBP) treatment attenuated functional activity in specific brain regions, including the parafascicular nucleus, thalamus, superior/inferior colliculus, periaqueductal gray, cingulate cortex, amygdala, midbrain, lateral habenula, and hypothalamus.
- MEMRI identified distinct patterns of cerebral activation and deactivation associated with itching and GBP treatment.
Conclusions:
- MEMRI reveals novel functional cerebral activity related to itching and gabapentin (GBP) effects in rats.
- These findings provide a basis for monitoring therapeutic interventions for pathological itch.
- The study offers potential insights for developing clinical strategies to manage chronic itch.
