Engineering a prostate-specific membrane antigen-activated tumor endothelial cell prodrug for cancer therapy

Samuel R Denmeade, Annastasiah M Mhaka, D Marc Rosen, W Nathaniel Brennen, Susan Dalrymple, Ingrid Dach, Claus Olesen, Bora Gurel, Angelo M DeMarzo, George Wilding, Michael A Carducci, Craig A Dionne, Jesper Vuust Møller, Poul Nissen, Søren Brøgger Christensen, John T Isaacs

    116 Citations (Scopus)

    Abstract

    Heterogeneous expression of drug target proteins within tumor sites is a major mechanism of resistance to anticancer therapies. We describe a strategy to selectively inhibit, within tumor sites, the function of a critical intracellular protein, the sarcoplasmic/endoplasmic reticulum calcium adenosine triphosphatase (SERCA) pump, whose proper function is required by all cell types for viability. To achieve targeted inhibition, we took advantage of the unique expression of the carboxypeptidase prostate-specific membrane antigen (PSMA) by tumor endothelial cells within the microenvironment of solid tumors. We generated a prodrug, G202, consisting of a PSMA-specific peptide coupled to an analog of the potent SERCA pump inhibitor thapsigargin. G202 produced substantial tumor regression against a panel of human cancer xenografts in vivo at doses that were minimally toxic to the host. On the basis of these data, a phase 1 dose-escalation clinical trial has been initiated with G202 in patients with advanced cancer.
    Original languageEnglish
    JournalScience Translational Medicine
    Volume4
    Issue number140
    Pages (from-to)140ra86
    ISSN1946-6234
    DOIs
    Publication statusPublished - 27 Jun 2012

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