Various endogenous and exogenous small molecules

The term Various endogenous and exogenous small molecules refers to a broad and heterogeneous collection of chemical compounds rather than a specific biological macromolecule or therapeutic target. Endogenous small molecules are naturally occurring substances within an organism, such as hormones, neurotransmitters, and metabolic intermediates, which play critical roles in physiological signaling and homeostasis (National Center for Biotechnology Information, 2023). Exogenous small molecules include synthetic drugs, environmental toxins, and dietary components that enter the body from external sources (Nature Education, 2014). Because this term describes a diverse group of ligands that interact with a wide array of receptors, enzymes, and transporters, it does not constitute a single, actionable target for drug discovery. Instead, it represents the chemical space from which many therapeutic agents and their natural counterparts are derived, making the entry too non-specific for standard pharmacological classification.

Other names

Small moleculesEndogenous ligandsExogenous compoundsMetabolites

Not applicable as this refers to a broad category of ligands rather than a specific therapeutic target.