Therapeutic Target Mapping to Advance Drug Repurposing for Cardiovascular Disease: A Perspective from an Explanted...

Background: Although cardiovascular disease (CVD) significantly impacts the quality of life of millions of patients worldwide, the high costs of developing new drugs and conducting clinical trials for CVD hinder therapeutic development in this field. Repurposing approved drugs, of which the safety has already been tested can significantly reduce the time and cost required for treating CVD. From the perspective of pharmacology, repurposed drugs are selected to specifically target CVD patients carrying the matching drug targets, enabling tailored, personalized intervention. In the context of drug repurposing, therapeutic target mapping is a process used to assess the enrichment of molecules that can be affected by a drug in order to produce a therapeutic effect. Methods: This narrative review summarizes the workflows and challenges of performing therapeutic target mapping to assess the potential of repurposing existing drugs for treating CVD. We also share our perspective of how retrospective studies of human specimens can contribute to therapeutic target mapping based on experience from the Bruce McManus Cardiovascular Biobank (BMCB), a large explanted heart biobank located in Vancouver, Canada. The literature we discuss was identified by non-systematic searches of PubMed, using search terms "human-derived specimens", "drug repurposing", and "cardiovascular disease". We reviewed articles from 2012 to 2026 and prioritized studies conducted after 2019 to discuss recent advances in the field. Conclusions: Human specimens of high molecular quality are needed for evaluating the enrichment of drug targets in CVD. Therapeutic target mapping in diseased cardiovascular tissue requires integrated expertise from medical, translational, and applied sciences to identify suitable human specimens for molecular phenotyping, and to design hypothesis-driven approaches to validate the drugs suggested for repurposing.