Microenvironment proteinases, proteinase-activated receptor regulation, cancer and inflammation

Rahil Eftekhari, Stacy G. De Lima, Yu Liu, Koichiro Mihara, Mahmoud Saifeddine, Farshid Noorbakhsh, Isobel A. Scarisbrick, Morley D. Hollenberg

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We propose that in the microenvironment of inflammatory tissues, including tumours, extracellular proteinases can modulate cell signalling in part by regulating proteinase-activated receptors (PARs). We have been exploring this mechanism in a variety of inflammation and tumour-related settings that include tumour-derived cultured cells from prostate and bladder cancer, as well as immune inflammatory cells that are involved in the pathology of inflammatory diseases including multiple sclerosis. Our work showed that proteinase signalling via the PARs affects prostate and bladder cancer-derived tumour cell behaviour and can regulate calcium signalling in human T-cell and macrophage-related inflammatory cells as well as in murine splenocytes. Further, we found that the tumour-derived prostate cancer cells and immune-related cells (Jurkat, THP1, mouse splenocytes) can produce PAR-regulating proteinases (including kallikreins: kallikrein-related peptidases), that can control tissue function by both a paracrine and autocrine mechanism. We suggest that this PAR-driven signalling process involving secreted microenvironment proteinases can play a key role in cancer and inflammatory diseases including multiple sclerosis.

Original languageEnglish (US)
Pages (from-to)1023-1039
Number of pages17
JournalBiological Chemistry
Issue number9
StatePublished - Sep 25 2018


  • T-cells/macrophages/splenocytes
  • bladder cancer
  • microenvironment proteinases
  • multiple sclerosis
  • prostate cancer
  • proteinase-activated receptors (PARs)

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Clinical Biochemistry


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