Collagenase-expressing salmonella targets major collagens in pancreatic cancer leading to reductions in immunosuppressive subsets and tumor growth

Nancy D. Ebelt, Vic Zamloot, Edith Zuniga, Kevin B. Passi, Lukas J. Sobocinski, Cari A. Young, Bruce R. Blazar, Edwin R. Manuel

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Therapeutic resistance in pancreatic ductal adenocarcinoma (PDAC) can be attributed, in part, to a dense extracellular matrix containing excessive collagen deposition. Here, we describe a novel Salmonella typhimurium (ST) vector expressing the bacterial collagenase Streptomyces omiyaensis trypsin (SOT), a serine protease known to hydrolyze collagens I and IV, which are predominantly found in PDAC. Utilizing aggressive models of PDAC, we show that ST-SOT selectively degrades intratumoral collagen leading to decreases in immunosuppressive subsets, tumor proliferation and viability. Ultimately, we found that ST-SOT treatment significantly modifies the intratumoral immune landscape to generate a microenvironment that may be more conducive to immunotherapy.

Original languageEnglish (US)
Article number3565
JournalCancers
Volume13
Issue number14
DOIs
StatePublished - Jul 2 2021

Bibliographical note

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • Attenuated Salmonella typhimurium
  • Collagen
  • Collagenase
  • Desmoplasia
  • Pancreatic ductal adenocarcinoma
  • Targeted therapies
  • Therapeutic resistance
  • Tumor microenvironment

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