Receptors in the gastrointestinal tract

Area of Science:

• Gastrointestinal physiology
• Pharmacology
• Molecular biology

Background:

• The concept of receptors has evolved into a new science, receptorology.
• Receptors are identified using various techniques, leading to the discovery of new receptor subtypes.
• Receptors in the gastrointestinal tract play a crucial role in modulating neurotransmitter release.

Purpose of the Study:

• To explore the evolving science of receptorology.
• To detail the identification and function of receptors in the gastrointestinal tract.
• To highlight the dynamic nature of receptors and their implications for disease treatment.

Main Methods:

• Binding assays
• Agonist-antagonist interaction studies
• Autoradiography
• Biochemical studies on post-receptor events

Main Results:

• Identification of numerous receptors and subtypes in the gastrointestinal tract.
• Demonstration of receptors on effector organs and nerve terminals modulating neurotransmitter release.
• Understanding of post-receptor events involving second and third messenger regulation.
• Recognition of receptors as dynamic membrane components undergoing alterations (interconversion, internalization, mobility, regulation).
• Discovery of new receptors, including tachykinin and prostaglandin subtypes, and dihydropyridine receptors in gut calcium channels.

Conclusions:

• Receptors are dynamic entities, not static, with significant alterations.
• Precise knowledge of gastrointestinal receptors, agonists, and antagonists is crucial.
• This knowledge forms the basis for more specific and effective treatments for gastrointestinal disorders.