Hypoxic Cell Macromolecules (via Bioreductive Trapping)

Hypoxic cell macromolecules, as a target class, refer to cellular proteins, nucleic acids, and other large biomolecules within cells that are located in regions of low oxygen (hypoxia), particularly within solid tumors. These macromolecules become the site of covalent binding or "trapping" by certain bioreductive drugs or probes that are selectively activated under hypoxic conditions. Bioreductive trapping involves prodrugs or imaging agents that are enzymatically reduced in low oxygen environments, forming reactive species capable of covalently binding to intracellular macromolecules such as proteins and DNA, leading to selective accumulation of the agent in hypoxic regions.

Covalent binding to intracellular macromolecules following enzymatic reduction under hypoxic conditions. This leads to accumulation of the drug or probe specifically in oxygen-deprived regions.