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Updated: Oct 2, 2026
Functional Neuroimaging Using Ultrasonic Blood-brain Barrier Disruption and Manganese-enhanced MRI
Published on: July 12, 2012
A method to induce manganese accumulation in the brain of the cirrhotic rat and its evaluation
Sergio Montes1, Mireya Alcaraz-Zubeldia, Camilo Ríos
1Departamento de Neuroquímica, Instituto Nacional de Neurología y Neurocirugía, Manuel Velasco Suarez, D.F., México, Mexico.
Abstract:
Cirrhotic patients tend to accumulate manganese in their brain, especially in basal ganglia. Manganese is a well-known neurotoxic metal, however, its effect in a condition such as liver damage has not been explored deeply due to the lack of a suitable experimental model. A method to induce manganese accumulation in the brain of the cirrhotic rat is described. Cirrhosis was induced by obstruction of biliary duct and simultaneous treatment with manganese in the drinking water (0.5 or 1 mg/ml) during 4 weeks. Metal brain accumulation was low in sham-operated rats with both of the Mn concentrations used. In contrast, manganese treatment to bile obstructed rats resulted in fourfold and eightfold metal increments in the 0.5 and 1 mg/ml Mn2+ concentrations, respectively. This method is useful to induce brain manganese deposition and to study its consequences.
Insights
Cirrhotic rats accumulate significant manganese in the brain, particularly the basal ganglia. This study presents a novel method to induce manganese deposition in cirrhotic rat brains for further research.
Area of Science:
- Neuroscience
- Toxicology
- Hepatology
Background:
- Cirrhosis leads to manganese accumulation in the brain, especially the basal ganglia.
- Manganese neurotoxicity is known, but its effects in liver damage are understudied due to a lack of models.
- A reliable experimental model is needed to investigate manganese's impact on the cirrhotic brain.
Purpose of the Study:
- To develop and describe a method for inducing manganese brain accumulation in cirrhotic rats.
- To establish a model for studying the consequences of manganese neurotoxicity in liver disease.
Main Methods:
- Cirrhosis was induced in rats via bile duct obstruction.
- Manganese was administered in drinking water (0.5 or 1 mg/ml) for 4 weeks concurrently with bile duct obstruction.
- Brain manganese levels were measured and compared between bile duct-ligated and sham-operated rats.
Main Results:
- Manganese accumulation in the brain was minimal in sham-operated rats.
- Bile duct-ligated rats showed significantly higher brain manganese levels.
- Fourfold and eightfold increases in brain manganese were observed at 0.5 and 1 mg/ml manganese concentrations, respectively.
Conclusions:
- The described method effectively induces manganese deposition in the brains of cirrhotic rats.
- This model provides a valuable tool for investigating manganese neurotoxicity in the context of liver damage.
- Further studies can now explore the specific neurological consequences of this induced manganese accumulation.
