Multiple, undefined cellular targets

The classification 'Multiple, undefined cellular targets' is a placeholder used in pharmacology and drug databases to describe agents whose specific molecular mechanisms of action have not been fully elucidated (DrugBank Online, 2024). This designation often applies to drugs that exert their effects through non-specific physical-chemical interactions, such as altering membrane fluidity or pH, rather than binding to a single protein pocket (ChEMBL Database, 2023). It is also commonly used for complex mixtures, such as botanical extracts, where the therapeutic effect is the result of synergistic interactions across numerous unidentified pathways (Nature Reviews Drug Discovery, 2018). For biotech analysts, this category highlights a significant knowledge gap, as the lack of a defined target complicates the optimization of drug potency and the prediction of adverse effects. While phenotypic screening can identify such compounds based on their clinical or cellular outcomes, modern drug development typically aims to deconvolve these targets to improve safety and efficacy (PubMed, PMID: 28253960). Consequently, this category represents a transitional state in the characterization of a drug's pharmacology.

Other names

Undefined targetsUnknown targetsNon-specific cellular targetsPolypharmacological targetsUnassigned targets

The mechanism of action involves non-specific interactions with multiple cellular components, such as lipid bilayers, or a broad spectrum of proteins without a primary high-affinity binding site (DrugBank Online, 2024).