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Drugs Affecting Neurotransmitter Release or Uptake01:21

Drugs Affecting Neurotransmitter Release or Uptake

Certain drugs can affect how neurotransmitters called catecholamines, are released or taken back up in the adrenergic neuron. They can have different effects on the body's sympathetic transmission. Reserpine, a natural compound found in the Rauwolfia shrub, blocks a transporter called vesicular monoamine transporter (VMAT), which leads to a buildup of catecholamines in the cell and reduces sympathetic transmission. Another drug called guanethidine works in multiple ways, including blocking...
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Adrenergic Agonists: Indirect-Acting Agents

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Neurochemical Transmission: Sites of Drug Action

Neurochemical transmission, the conduction of electrical impulses between neurons mediated by neurotransmitters, plays a vital role in various physiological processes. Autonomic drugs exert their effects by modulating neurotransmission within the autonomic nervous system. For instance, drugs such as hemicholinium block the precursor uptake necessary for synthesizing acetylcholine, an essential autonomic neurotransmitter. Following synthesis, neurotransmitters are stored in vesicles. Metyrosine...
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Drug-Receptor Interaction: Agonist

Agonists are drugs that interact with specific receptors in the body to produce a biological response. When an agonist binds to a receptor, it activates or enhances the receptor's function, leading to physiological effects. The interaction between agonist drugs and receptors is crucial for their therapeutic action in various medical treatments.
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Agonism and Antagonism: Quantification

When drugs are administered, they can elicit either an agonist or antagonist effect on the body. Agonism occurs when a drug activates a specific receptor, triggering a biological response. On the other hand, antagonism happens when a drug binds to the same receptors but blocks their activation, thereby preventing a biological response.
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Related Experiment Video

Updated: Jun 29, 2026

A Method for Remotely Silencing Neural Activity in Rodents During Discrete Phases of Learning
09:22

A Method for Remotely Silencing Neural Activity in Rodents During Discrete Phases of Learning

Published on: June 22, 2015

A neurotensin agonist and antagonist decrease and increase activity, respectively, but do not preclude discrete cue

C Norman1, S K Grimond-Billa, G W Bennett

  • 1Institute of Neuroscience, School of Biomedical Sciences, University of Nottingham, Nottingham, UK.

Journal of Psychopharmacology (Oxford, England)
|October 8, 2008
PubMed
Summary
This summary is machine-generated.

Neurotensin (NT) did not enhance appetitive trace conditioning in rats. While an NT agonist showed mixed results, an NT antagonist had no effect on learning, suggesting NT

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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Pharmacology

Background:

  • Neurotensin (NT) is implicated in cognitive functions.
  • Previous studies suggest NT agonists may enhance aversive trace conditioning.
  • The role of NT in appetitive associative learning remains less understood.

Purpose of the Study:

  • To investigate the role of neurotensin (NT) in appetitive associative learning.
  • To examine the effects of an NT agonist (PD149163) and an NT antagonist (SR142948A) on appetitive trace conditioning.
  • To determine if NT modulation influences learning under different inter-stimulus intervals (ISIs).

Main Methods:

  • Appetitive trace conditioning was employed using a conditioned stimulus (CS) and food delivery (UCS).
  • Rats were tested with a 0-s (contiguous) or 10-s inter-stimulus interval (ISI).
  • The effects of varying doses of PD149163 (agonist) and SR142948A (antagonist) were evaluated, with control measures for non-specific effects.

Main Results:

  • Associative learning was observed for the 0-s CS, with a slight reduction under a low dose of the NT agonist.
  • The NT agonist did not enhance, and at a higher dose, slightly reduced, 10-s trace conditioning.
  • The NT antagonist showed no significant effects on appetitive conditioning, although non-specific behavioral changes were noted.

Conclusions:

  • Neurotensin (NT) does not appear to enhance appetitive trace conditioning in this paradigm.
  • The findings contrast with previous research on aversive conditioning, suggesting differential roles of NT in various learning contexts.
  • Further research is needed to elucidate the complex role of NT in associative learning and cognition.