Related Experiment Video
Updated: May 11, 2026
07:02
A Computerized Test Battery to Study Pharmacodynamic Effects on the Central Nervous System of Cholinergic Drugs in Early Phase Drug Development
Published on: February 11, 2019
Piracetam prevents scopolamine-induced memory impairment and decrease of NTPDase, 5'-nucleotidase and adenosine
Patricia C Marisco1, Fabiano B Carvalho, Michelle M Rosa
1Graduation Program in Pharmacology, Center of Health Sciences (CCS), Federal University of Santa Maria, Santa Maria, RS, CEP 97105-900, Brazil.
Neurochemical Research
|May 17, 2013
Summary
Piracetam enhances memory by protecting against scopolamine-induced impairment and oxidative stress. It maintains key enzyme activities, suggesting the purinergic system is a target.
Area of Science:
- Neuroscience
- Biochemistry
- Pharmacology
Background:
- Piracetam is known to improve cognitive function, but its precise mechanism of action remains unclear.
- Scopolamine administration induces memory deficits, making it a valuable tool for studying cognitive impairment.
- Extracellular adenine nucleotide metabolism involves enzymes like NTPDase, 5'-nucleotidase, and ADA, which play roles in neurotransmission and cellular function.
Purpose of the Study:
- To investigate the effect of piracetam on enzymes involved in extracellular adenine nucleotide metabolism in the context of scopolamine-induced memory impairment.
- To explore the role of the purinergic system in piracetam's cognitive-enhancing effects.
- To assess piracetam's impact on oxidative stress markers in the brain.
Main Methods:
- Animals were subjected to scopolamine-induced memory impairment using inhibitory avoidance and object recognition tasks.
- Piracetam was administered intracerebroventricularly prior to training.
- Enzyme activities (NTPDase, 5'-nucleotidase, ADA) and TBARS levels were measured in hippocampal and cerebral cortex synaptosomes.
Main Results:
- Scopolamine significantly reduced the activities of NTPDase, 5'-nucleotidase, and ADA in both hippocampus and cerebral cortex.
- Piracetam fully prevented the memory impairment induced by scopolamine and normalized the decreased enzyme activities.
- Piracetam also inhibited the scopolamine-induced increase in TBARS levels, indicating a reduction in oxidative stress.
Conclusions:
- Piracetam's memory-enhancing effects are linked to the maintenance of extracellular adenine nucleotide metabolism enzyme activities.
- Piracetam demonstrates neuroprotective properties by mitigating oxidative stress associated with scopolamine-induced cognitive impairment.
- The purinergic system is suggested as a potential molecular target for piracetam's therapeutic actions.
Related Concept Videos
01:30Cognitive Enhancers: Cholinesterase Inhibitors and NMDA Receptor Antagonists
Cognitive enhancers, also known as "smart drugs," are substances used to enhance memory, mental alertness, and concentration. These can be natural or synthetic and improve cognition in conditions like Alzheimer's disease (AD) and other neurodegenerative diseases. Some common examples include caffeine, amphetamines, methylphenidate, modafinil, arecoline, donepezil, vortioxetine, and piracetam. These enhancers work on the principle of synaptic plasticity and altered circuit function. They...
01:22Alzheimer's Disease: Treatment
Alzheimer's Disease (AD), a neurodegenerative disorder, is pathologically identified by amyloid plaques and neurofibrillary tangles composed of tau protein. AD pharmacotherapy aims to manage cognitive symptoms, delay disease progression, and treat behavioral symptoms. The treatment is primarily symptomatic and palliative, with no definitive disease-modifying therapy available. Cholinesterase inhibitors, including donepezil (Aricept), rivastigmine (Exelon), and galantamine (Razadyne), are...
01:20Antiepileptic Drugs: Modulators of Neurotransmitter Release Mediated by SV2A Protein
Antiepileptic drugs, such as levetiracetam (Keppra) and brivaracetam (Briviact), have emerged as crucial tools in managing epilepsy. These medications exert their therapeutic effects by targeting the synaptic vesicle protein SV2A, a transmembrane glycoprotein primarily found in the brain.
SV2A is a transmembrane glycoprotein located predominantly in the brain, modulating the release of neurotransmitters for neuronal communication. Both levetiracetam and brivaracetam exhibit a high affinity for...
SV2A is a transmembrane glycoprotein located predominantly in the brain, modulating the release of neurotransmitters for neuronal communication. Both levetiracetam and brivaracetam exhibit a high affinity for...
01:24Parkinson's Disease: Treatment
Neurodegenerative disorders, such as Parkinson's Disease (PD), involve the gradual and irreversible destruction of neurons in particular brain areas. These disorders exhibit standard features like proteinopathies, selective vulnerability of some neurons, and an interaction of intrinsic properties, genetics, and environmental influences in neural injury.
Parkinson's Disease is primarily a result of the loss of dopaminergic neurons in the substantia nigra pars compacta. The cornerstone of its...
Parkinson's Disease is primarily a result of the loss of dopaminergic neurons in the substantia nigra pars compacta. The cornerstone of its...
01:14Antiepileptic Drugs: Glutamate Antagonists
Glutamate is a fundamental neurotransmitter in the central nervous system, playing a vital role in neuronal communication and various cognitive processes. Glutamate stands as the principal excitatory neurotransmitter in the brain. Its presence is crucial for the communication between neurons, underpinning essential processes such as synaptic transmission, neuronal excitability, and plasticity. These functions are vital for higher-order cognitive processes, including learning and memory. The...
01:27Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase
Phase II biotransformation reactions are essential for detoxifying and eliminating xenobiotics, including many pharmaceutical compounds. These reactions typically involve conjugation, the covalent attachment of polar endogenous groups such as glucuronic acid, sulfate, methyl, or acetyl moieties to functional groups introduced during Phase I metabolism. The resulting conjugates are more water-soluble, enabling efficient renal or biliary excretion.The major classes of Phase II enzymes include...