Intracellular macromolecular targets of cytotoxic payload

The term Intracellular macromolecular targets of cytotoxic payload refers to a broad category of biological molecules, rather than a single specific protein, that serve as the ultimate site of action for the toxic component of a targeted therapeutic, such as an antibody-drug conjugate (ADC). These targets are typically essential for cellular integrity or proliferation; common examples include tubulin, which is targeted by antimitotic agents like auristatins and maytansinoids, and DNA or topoisomerase enzymes, which are targeted by DNA-damaging agents or camptothecin derivatives. In the context of ADC therapy, the drug is delivered to a specific cell surface antigen, internalized, and then the payload is released to interact with these intracellular macromolecules to induce cell death. Because this term describes a functional class of targets rather than a specific gene product or receptor, it is considered a descriptive category used in pharmacology to define the downstream mechanism of action of cytotoxic agents.

Other names

Cytotoxic payload targetsADC payload targetsIntracellular drug targetsEffector targets

Payloads exert toxicity by binding to essential intracellular structures such as tubulin (inhibiting mitosis) or DNA/topoisomerases (inducing DNA damage and apoptosis) after being released from a delivery vehicle like an antibody-drug conjugate (ADC).