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The effect of memory blocking antibiotics and their analogs on acetylcholinesterase
Abstract:
The ability of antibiotics to inhibit acetylcholinesterase was measured in homogenates of goldfish brain. Puromycin aminonucleoside was the most potent inhibitor followed by puromycin, cycloheximide and acetoxycycloheximide. Puromycin effectively impaired retention of active-avoidance learning in goldfish when injected either immediately before or after training, while puromycin aminonucleoside did not regardless of injection time. These results suggest that the known amnestic effects of puromycin, cycloheximide and acetoxycycloheximide are not a consequence of interference with acetylcholinesterase.
Insights
Antibiotics like puromycin were tested for their effect on goldfish brain acetylcholinesterase. While some antibiotics inhibited this enzyme, their impact on memory formation suggests the memory loss is not due to acetylcholinesterase inhibition.
Area of Science:
- Neuroscience
- Biochemistry
- Pharmacology
Background:
- Acetylcholinesterase is a key enzyme in neural function.
- Certain antibiotics are known to affect cognitive processes.
- The link between antibiotic-induced amnesia and acetylcholinesterase inhibition requires investigation.
Purpose of the Study:
- To investigate the inhibitory effects of specific antibiotics on goldfish brain acetylcholinesterase.
- To determine if antibiotic-induced memory impairment in goldfish correlates with acetylcholinesterase inhibition.
Main Methods:
- Acetylcholinesterase activity was measured in goldfish brain homogenates.
- The inhibitory potential of puromycin aminonucleoside, puromycin, cycloheximide, and acetoxycycloheximide was assessed.
- Active-avoidance learning and memory retention were tested in goldfish following antibiotic administration.
Main Results:
- Puromycin aminonucleoside exhibited the strongest inhibition of acetylcholinesterase.
- Puromycin impaired memory retention when administered before or after training.
- Puromycin aminonucleoside did not affect memory retention regardless of administration timing.
Conclusions:
- The amnestic effects of puromycin, cycloheximide, and acetoxycycloheximide are not mediated by acetylcholinesterase inhibition.
- Antibiotic-induced memory impairment may involve mechanisms other than acetylcholinesterase activity.
- Goldfish brain acetylcholinesterase is not the primary target for the observed memory-altering effects of these antibiotics.