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Endogenous antipyretics
1Division of Endocrinology, Diabetes, Metabolism and Molecular Medicine, Department of Medicine, Tupper Research Institute, Tufts University School of Medicine and New England Medical Center, Boston, MA 02111, USA. jtatro@lifespan.org
Abstract:
Fever is the hallmark of the stereotyped host response to microbial infection, although it is just one of a number of high-risk strategies employed by the infected host to clear itself of invading pathogens. The febrile response is accompanied by activation of multiple endogenous antipyretic systems that serve to suppress its magnitude or duration. These include neuroactive substances of neural and humoral origin, some of which (e.g., glucocorticoids, melanocortins, and IL-10) have broad-ranging anti-inflammatory actions. Glucocorticoids, vasopressin, and melanocortins appear to exert their antipyretic effects by acting on receptors within the brain, but beyond this the mechanisms involved are unknown. It is hypothesized, but not proven, that endogenous antipyretic systems protect the host against the destructive consequences of unchecked fever. Importantly, pharmacological blockade of the actions of endogenous antipyretic systems increases fevers of even low to moderate intensity. Therefore, in addition to protecting against catastrophic consequences of high fever, endogenous antipyretic systems seem to play a fundamental physiological role in determining the normal course of fever. Elucidating the neural and biochemical mechanisms involved in suppression of fever by physiological antipyretic systems will yield a rich benefit, both by advancing the basic understanding of host defense strategies, and by permitting the design of novel antipyretic and anti-inflammatory strategies for therapeutic intervention in human disease.
Insights
Fever is a host defense strategy, but the body has natural systems to control it. Understanding these antipyretic systems can lead to new treatments for fever and inflammation.
Area of Science:
- Immunology
- Neuroscience
- Physiology
Background:
- Fever is a key host defense mechanism against microbial infections.
- The febrile response is regulated by endogenous antipyretic systems that limit its intensity and duration.
- These systems involve neuroactive substances like glucocorticoids, melanocortins, and IL-10, which also possess anti-inflammatory properties.
Purpose of the Study:
- To investigate the physiological role of endogenous antipyretic systems in regulating fever.
- To explore the neural and biochemical mechanisms underlying fever suppression.
- To identify potential therapeutic targets for novel antipyretic and anti-inflammatory strategies.
Main Methods:
- The abstract does not specify methods, but implies studies on host defense mechanisms and fever regulation.
- Research likely involves investigating the effects of blocking endogenous antipyretic systems.
- Analysis of neuroactive substances and their receptor interactions within the brain.
Main Results:
- Endogenous antipyretic systems, including glucocorticoids, vasopressin, and melanocortins, act on brain receptors to reduce fever.
- Pharmacological blockade of these systems exacerbates fever, even at low intensities.
- These systems play a fundamental role in determining the normal course of fever.
Conclusions:
- Endogenous antipyretic systems are crucial for controlling fever and preventing potential harm from unchecked high temperatures.
- Elucidating these mechanisms advances our understanding of host defense strategies.
- This knowledge can inform the development of new therapeutic interventions for inflammatory diseases and fever management.