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Dual-hit strategy for therapeutic targeting of pancreatic cancer in patient-derived xenograft tumors

  • Tista Roy Chaudhuri*
  • , Qingxiang Lin
  • , Ewa K Stachowiak
  • , Spencer R Rosario
  • , Joseph A Spernyak
  • , Wen Wee Ma
  • , Michal K Stachowiak
  • , Michelle K Greene
  • , Gerard P Quinn
  • , Simon S McDade
  • , Martin Clynes
  • , Christopher J Scott
  • , Robert M Straubinger*
  • *Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Purpose
Paracrine activation of pro-fibrotic hedgehog (HH) signaling in pancreatic ductal adenocarcinoma (PDAC) results in stromal amplification that compromises tumor drug delivery, efficacy, and patient survival. Interdiction of HH-mediated tumor-stroma crosstalk with smoothened (SMO) inhibitors (SHHi) “primes” PDAC patient-derived xenograft (PDX) tumors for increased drug delivery by transiently increasing vascular patency/permeability, and thereby macromolecule delivery. However, patient tumor isolates vary in their responsiveness, and responders show co-induction of epithelial–mesenchymal transition (EMT). We aimed to identify the signal derangements responsible for EMT induction and reverse them and devise approaches to stratify SHHi-responsive tumors noninvasively based on clinically-quantifiable parameters.

Experimental design
Animals underwent diffusion-weighted magnetic resonance (DW-MR) imaging for measurement of intratumor diffusivity. In parallel, tissue-level deposition of nanoparticle probes was quantified as a marker of vascular permeability/perfusion. Transcriptomic and bioinformatic analysis was employed to investigate SHHi-induced gene reprogramming and identify key “nodes” responsible for EMT induction.

Results
Multiple patient tumor isolates responded to short-term SHH inhibitor exposure with increased vascular patency and permeability, with proportionate increases in tumor diffusivity. Nonresponding PDXs did not. SHHi-treated tumors showed elevated FGF drive and distinctly higher nuclear localization of fibroblast growth factor receptor (FGFR1) in EMT-polarized tumor cells. Pan-FGFR inhibitor NVP-BGJ398 (Infigratinib) reversed the SHHi-induced EMT marker expression and nuclear FGFR1 accumulation without compromising the enhanced permeability effect.

Conclusions
This dual-hit strategy of SMO and FGFR inhibition provides a clinically-translatable approach to compromise the profound impermeability of PDAC tumors. Furthermore, clinical deployment of DW-MR imaging could fulfill the essential clinical–translational requirement for patient stratification.

Original languageEnglish
Pages (from-to)1367-1381
Number of pages15
JournalClinical Cancer Research
Volume30
Issue number7
Early online date20 Feb 2024
DOIs
Publication statusPublished - 01 Apr 2024

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

  1. SDG 3 - Good Health and Well-being
    SDG 3 Good Health and Well-being

Keywords

  • Cancer Research
  • Oncology

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