Role of pd-l1 in gut mucosa tolerance and chronic inflammation

Marina Chulkina, Ellen J. Beswick, Irina V. Pinchuk

Research output: Contribution to journalReview articlepeer-review

25 Scopus citations


The gastrointestinal (GI) mucosa is among the most complex systems in the body. It has a diverse commensal microbiome challenged continuously by food and microbial components while delivering essential nutrients and defending against pathogens. For these reasons, regulatory cells and receptors are likely to play a central role in maintaining the gut mucosal homeostasis. Recent lessons from cancer immunotherapy point out the critical role of the B7 negative co-stimulator PD-L1 in mucosal homeostasis. In this review, we summarize the current knowledge supporting the critical role of PD-L1 in gastrointestinal mucosal tolerance and how abnormalities in its expression and signaling contribute to gut inflammation and cancers. Abnormal expression of PD-L1 and/or the PD-1/PD-L1 signaling pathways have been observed in the pathology of the GI tract. We also discuss the current gap in our knowledge with regards to PD-L1 signaling in the GI tract under homeostasis and pathology. Finally, we summarize the current understanding of how this pathway is currently targeted to develop novel therapeutic approaches.

Original languageEnglish
Article number9165
Pages (from-to)1-16
Number of pages16
JournalInternational Journal of Molecular Sciences
Issue number23
StatePublished - Dec 1 2020

Bibliographical note

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  • Gastrointestinal inflammation
  • Homeostasis
  • Inflammatory bowel disease
  • PD-L1

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry


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