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5-Hydroxytryptamine (serotonin): biphasic dose responses.

E J Calabrese¹

¹Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts, Amherst 01003, USA. edwardc@schoolph.umass.edu

Critical Reviews in Toxicology

|August 16, 2001

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Biphasic dose-response relationships are common with serotonin (5-hydroxytryptamine or 5-HT) systems, affecting various functions. These complex responses are seen with 5-HT agonists and antagonists in diverse experimental models.

Area of Science:

Neuroscience
Pharmacology
Physiology

Background:

Serotonin (5-hydroxytryptamine or 5-HT) systems play a crucial role in regulating numerous physiological and behavioral processes.
Dose-response relationships are fundamental to understanding drug mechanisms and effects.
Biphasic responses, where a substance elicits opposite effects at different concentrations, present a complex pharmacological challenge.

Purpose of the Study:

To summarize the occurrence and implications of biphasic dose-response relationships involving serotonin (5-HT) receptor systems.
To highlight the consistent observation of these complex responses across various experimental contexts.
To underscore the significance of biphasic effects for 5-HT agonists and antagonists.

Main Methods:

Related Experiment Videos

Literature review and synthesis of existing experimental data.

Analysis of studies reporting biphasic effects related to 5-HT receptor activity.

Categorization of observed responses, including behavioral, cardiovascular, and neuromuscular effects.

Main Results:

Biphasic dose-response relationships are reliably observed in studies of 5-HT receptor systems.
These complex effects are documented across a wide spectrum of physiological and behavioral outcomes.
Examples include modulation of aggressive behavior, cardiovascular functioning, and muscle relaxation.

Conclusions:

Biphasic responses are a significant characteristic of 5-HT receptor pharmacology.
Understanding these complex dose-dependent effects is crucial for predicting the actions of 5-HT agonists and antagonists.
Further research is needed to fully elucidate the mechanisms underlying these biphasic phenomena and their interactions with other systems.