A Humanized Monoclonal Antibody Targeting Extracellular Nicotinamide Phosphoribosyltransferase Prevents Aggressive Prostate Cancer Progression

Belinda L. Sun, Lin Tang, Xiaoguang Sun, Alexander N. Garcia, Sara M. Camp, Edwin Posadas, Anne E. Cress, Joe GN Garcia

Research output: Contribution to journalArticlepeer-review

Abstract

Prostate cancer (PCa) is the major cause of cancer-related death in males; however, effective treatments to prevent aggressive progression remain an unmet need. We have previously demonstrated that secreted extracellular nicotinamide phosphoribosyltransferase (eNAMPT) is a multifunctional innate immunity regulator that promotes PCa invasion. In the current study, we further investigate the therapeutic effects of an eNAMPT-neutralizing humanized monoclonal antibody (ALT-100 mAb) in preclinical PCa orthotopic xenograft models. We utilized human aggressive PCa cells (DU145 or PC3) for prostate implantation in SCID mice receiving weekly intraperitoneal injections of either ALT-100 mAb or IgG/PBS (control) for 12 weeks. Prostatic tumors and solid organs were examined for tumor growth, invasion, and metastasis and for biochemical and immuno-histochemistry evidence of NFκB activation. ALT-100 mAb treatment significantly improved overall survival of SCID mice implanted with human PCa orthotopic prostate xenografts while inducing tumor necrosis, decreasing PCa proliferation and reducing local invasion and distal metastases. The ALT-100 mAb inhibits NFκB phosphorylation and signaling in PCa cells both in vitro and in vivo. This study demonstrates that eNAMPT neutralization effectively prevents human PCa aggressive progression in preclinical models, indicating its high potential to directly address the unmet need for an effective targeted therapy for patients with aggressive PCa.

Original languageEnglish (US)
Article number1322
JournalPharmaceuticals
Volume14
Issue number12
DOIs
StatePublished - Dec 2021

Keywords

  • Castration-resistant prostate cancer (CRPC)
  • Damage-associated molecular pattern protein
  • ENAMPT-neutralizing monoclonal antibody (ALT-100)
  • Extracellular nicotinamide phosphoribosyltransferase (eNAMPT)
  • Ortho-topic xenograft mouse model
  • Prostate cancer

ASJC Scopus subject areas

  • Molecular Medicine
  • Pharmaceutical Science
  • Drug Discovery

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