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A Piglet Model of Neonatal Hypoxic-Ischemic Encephalopathy
Published on: May 16, 2015
The effects of repeated propofol anesthesia on spatial memory and long-term potentiation in infant rats under hypoxic
Mang Sun1,2, Ruixue Yuan3, Hui Liu4
1Department of Anesthesiology, Children's Hospital of Chongqing Medical University, China.
Insights
Adequate oxygen is crucial during propofol anesthesia. Propofol combined with hypoxia significantly impairs spatial memory and long-term potentiation (LTP) in young rats, increasing cell apoptosis.
Area of Science:
- Neuroscience
- Anesthesiology
- Toxicology
Background:
- Propofol is a common intravenous anesthetic agent.
- Hypoxemia (low oxygen) is a frequent complication during anesthesia.
- The impact of propofol on cognitive functions, particularly under hypoxic conditions, requires further investigation.
Purpose of the Study:
- To investigate the effects of propofol on spatial memory and long-term potentiation (LTP) in young rats exposed to varying oxygen levels.
- To determine the neuroprotective role of adequate oxygenation during propofol administration.
Main Methods:
- Eighty-four Sprague-Dawley rats (7 days old) were divided into six groups, receiving either propofol or intralipid solvent with exposure to 50% oxygen, room air, or 18% oxygen (hypoxia) daily for seven days.
- Spatial memory was assessed using the escape latency and platform location crossings in a water maze.
- Long-term potentiation (LTP) was evaluated by measuring field excitatory postsynaptic potential (fEPSP) and its induction rate.
- Apoptotic markers, including activated caspase-3, were analyzed.
Main Results:
- Propofol administration reduced fEPSP and LTP induction rates across all groups compared to controls.
- Hypoxic conditions (18% oxygen) combined with propofol significantly worsened LTP reduction and spatial memory deficits (increased escape latency, reduced platform crossings).
- The propofol-hypoxia group showed increased apoptosis and activated caspase-3 levels compared to the propofol-room air group.
Conclusions:
- Propofol impairs synaptic plasticity and spatial memory, with these effects being exacerbated under hypoxic conditions.
- Hypoxia potentiates propofol-induced neurotoxicity, evidenced by increased apoptosis.
- Maintaining adequate oxygenation during propofol anesthesia is critical for preserving cognitive function and preventing neuronal damage in young animals.
Abstract:
Propofol is widely used as an intravenous drug for induction and maintenance in general anesthesia. Hypoxemia is a common complication during perianesthesia. We want to know the effect of propofol on spatial memory and LTP (Long-term potentiation) under hypoxic conditions. In this study, 84 seven-day-old Sprague-Dawley rats were randomly assigned into six groups (n = 14)-four control groups: lipid emulsion solvent + 50% oxygen (CO), lipid emulsion solvent + room air (CA), lipid emulsion solvent + 18% oxygen (CH), and propofol + 50% oxygen (propofol-oxygen, PO); and two experiment groups: propofol + room air (propofol-air, PA), and propofol + 18% oxygen (propofol-hypoxia, PH). After receiving propofol (50 mg/kg) or the same volume of intralipid intraperitoneal (5.0 ml/kg), injected once per day for seven consecutive days, the rats were exposed to 18% oxygen, 50% oxygen and air, until recovery of the righting reflex. We found that the apoptotic index and activated caspase-3 increased in the PH group (P < 0.05) compared with the PA group, fEPSP (field excitatory postsynaptic) potential and success induction rate of LTP reduced in all propofol groups (P < 0.05). Compared with the PO group, the fEPSP and success induction rate of LTP reduced significantly in the PA and PH groups (P < 0.05). Moreover, compared with CH group, the average time of escape latency was longer, and the number of platform location crossings was significantly reduced in the PH group (P < 0.05). Thus, we believe that adequate oxygen is very important during propofol anesthesia.
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