Systemic endogenous receptors and circulating physiological pathways

Systemic endogenous receptors and circulating physiological pathways is a broad conceptual grouping rather than a specific, well-defined molecular target. In the field of pharmacology, a therapeutic target is defined as a discrete biological entity, such as a protein, enzyme, or ion channel, that can be addressed by a drug to produce a clinical effect (IUPHAR/BPS Guide to PHARMACOLOGY). This term instead refers to the collective network of endogenous signaling molecules and their corresponding receptors that maintain homeostasis and regulate systemic functions across various organs and tissues. Because it encompasses a vast array of distinct physiological systems—including the endocrine, nervous, and immune systems—it lacks the molecular specificity required for targeted drug design. Consequently, it is classified as an incorrect or overly broad designation for a drug target, as effective therapeutic interventions must focus on specific components within these pathways to ensure selectivity and minimize adverse systemic effects.

Not applicable as this is a broad physiological category rather than a specific molecular target.