N-Butylphthalide Improves Cognitive Function in Rats after Carbon Monoxide Poisoning

Area of Science:

• Neuroscience
• Toxicology
• Pharmacology

Background:

• Cognitive impairment is a common neurological issue following carbon monoxide (CO) poisoning.
• N-Butylphthalide (NBP) has demonstrated potential neuroprotective effects in prior research.

Purpose of the Study:

• To investigate the efficacy of NBP in mitigating cognitive dysfunction induced by acute severe CO poisoning in a rat model.
• To explore the molecular mechanisms underlying NBP's neuroprotective effects.

Main Methods:

• Rats were exposed to CO to establish a poisoning model.
• Treatment groups received hyperbaric oxygen therapy, with one group additionally receiving NBP.
• Cognitive function, hippocampal ultrastructure, and protein expressions (calpain 1, CaMK II) were assessed using behavioral tests, electron microscopy, immunofluorescence, and western blot.

Main Results:

• CO poisoning led to significant cognitive impairment and hippocampal damage.
• Expressions of calpain 1 and CaMK II proteins were notably elevated post-CO exposure.
• NBP treatment improved cognitive function, preserved hippocampal ultrastructure, and reduced calpain 1 and CaMK II protein levels.

Conclusions:

• CO poisoning induces cognitive deficits through the upregulation of calpain 1 and CaMK II proteins.
• NBP administration offers neuroprotection by normalizing these protein expressions and maintaining hippocampal integrity.
• NBP shows promise as a therapeutic agent for brain injury resulting from CO poisoning.