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Quantitative susceptibility mapping in rats with minimal hepatic encephalopathy: Does iron overload aggravate
Xuhong Yang1, Minglei Wang2, Wenxiao Liu3
1School of Clinical Medicine, Ningxia Medical University, Yinchuan 750004, China.
Background And Aims:
Minimal hepatic encephalopathy (MHE) is a mild form of hepatic encephalopathy that lacks observable signs and symptoms. Nevertheless, MHE can cause neurocognitive dysfunction, although the neurobiological mechanisms are not fully understood. Here, the effects of hippocampal iron deposition on cognitive function and its role in MHE were investigated.
Materials And Methods:
Eighteen rats were assigned to experimental and control groups. MHE was induced by thioacetamide. Spatial memory and exploratory behavior were assessed by the Morris water and elevated plus mazes. Hippocampal susceptibility was measured by quantitative susceptibility mapping, iron deposition in the hippocampus and liver by Prussian blue staining, and inflammatory cytokine and ferritin levels in the hippocampus were measured by ELISA.
Results:
MHE rats showed impaired spatial memory and exploratory behavior (P < 0.05 for all parameters). The bilateral hippocampal susceptibility values were significantly raised in MHE rats, together with evidence of neuroinflammation (increased pro-inflammatory and reduced anti-inflammatory cytokine levels (all P < 0.05). Further analysis indicated good correlations between hippocampal susceptibility values with latency time and inflammatory cytokine levels in MHE but not in control rats.
Conclusion:
MHE induced by thioacetamide was associated with hippocampal iron deposition and inflammation, suggesting that iron overload may be an important driver of neuroinflammatory responses.
Insights
Minimal hepatic encephalopathy (MHE) is linked to hippocampal iron buildup and inflammation, impacting cognitive function. This study suggests iron overload may drive neuroinflammation in MHE.
Area of Science:
- Neuroscience
- Hepatology
- Biochemistry
Background:
- Minimal hepatic encephalopathy (MHE) presents subtle neurocognitive deficits.
- The underlying neurobiological mechanisms of MHE remain unclear.
- Investigating hippocampal iron deposition in MHE is crucial.
Purpose of the Study:
- To examine the impact of hippocampal iron deposition on cognitive function in MHE.
- To explore the role of iron in the neurobiology of MHE.
- To understand the relationship between iron, inflammation, and cognition in MHE.
Main Methods:
- Thioacetamide-induced MHE model in rats.
- Assessment of spatial memory and exploratory behavior using behavioral mazes.
- Quantitative susceptibility mapping for hippocampal iron, Prussian blue staining for iron deposition, and ELISA for cytokine and ferritin levels.
Main Results:
- MHE rats exhibited impaired spatial memory and exploratory behavior.
- Significantly elevated hippocampal susceptibility and neuroinflammation (cytokine imbalance) were observed in MHE rats.
- Hippocampal susceptibility correlated with cognitive deficits and inflammatory markers in MHE.
Conclusions:
- Thioacetamide-induced MHE is associated with hippocampal iron deposition and inflammation.
- Iron overload in the hippocampus may be a key factor driving neuroinflammation in MHE.
- These findings highlight a potential mechanism linking iron metabolism and cognitive dysfunction in MHE.
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