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Cancer Immunology, Immunotherapy

, Volume 68, Issue 2, pp 257–268 | Cite as

Hyperresponsiveness to interferon gamma exposure as a response mechanism to anti-PD-1 therapy in microsatellite instability colorectal cancer

  • Wenli Yuan
  • Deyao Deng
  • Hongchao Jiang
  • Changling Tu
  • Xueqin Shang
  • Hongchun He
  • Ruize Niu
  • Jian DongEmail author
Original Article
  • 371 Downloads

Abstract

Colorectal cancer (CRC) with high-level microsatellite instability (MSI-H) tends to be associated with a better response to programmed death receptor-1 (PD-1) blockade than does microsatellite stable CRC. However, emerging evidence makes the use of programmed death ligand-1 (PD-L1) as a biomarker problematic. Here, we sought to characterize the interactions between PD-L1 expression and the response to PD-1 blockade therapy in BALB/c mice with a subcutaneous tumor challenge. We further focused on interferon gamma (IFNγ)-induced PD-L1 expression in an in vitro setting to evaluate the responsiveness to IFNγ exposure and the specific signaling of PD-1 in HCT116 and SW480 cell lines. In this study, enhanced PD-L1 expression increased survival in CT26 cells, and PD-1 blockade increased the CTL profile and apoptotic cells in mice with CRC. Our in vitro findings showed that PD-L1 expression was significantly upregulated by a low-dose IFNγ treatment, and the MSI-H cell line might exhibit hyperresponsiveness to IFNγ exposure partly through the JAK–STAT pathway. These results suggest that intrinsic PD-L1 in cooperation with extrinsic IFNγ exposure in CRC may be more responsive to anti-PD-1 therapy, mainly through the CTL profile in the tumor microenvironment.

Keywords

Colorectal cancer Microsatellite instability IFNγ PD-L1 CTL 

Abbreviations

CRC

Colorectal cancer

CTL

Cytotoxic T lymphocyte

DAPI

4′,6-Diamidino-2-phenylindole

EGFR

Epidermal growth factor receptor

FCM

Flow cytometry

HE

Hematoxylin and eosin

IFNγ

Interferon gamma

JAK/STAT3

Janus kinase/signal transducer and activator of transcription 3

MAPK

Mitogen-activated protein kinase

MSI-H

High-level microsatellite instability

MSS

Microsatellite stable

PD-1

Programmed death-1

PD-L1

Programmed death ligand-1

PI3K/AKT

Phosphatidylinositol 3 kinase/protein kinase B

PTEN

Phosphatase and tensin homology deleted on chromosome 10

RT-PCR

Reverse-transcription quantitative polymerase chain reactions

TUNEL

TdT-mediated dUTP nick-end labeling

Notes

Acknowledgements

We would like to thank Xiaojin Li (Central laboratory, the second hospital of Yunnan Province) for his technical assistance in flow cytometry.

Author contributions

Conceived and designed the experiments: WY and JD. Performed the experiments: WY, CT, XS, HJ and HH. Analyzed the data: WY and JD. Contributed reagents/animals: DD, HJ and RN. Wrote the paper: WY and JD.

Funding

This study was partially supported by the Association Foundation Program of Yunnan Provincial Science and Technology Department and Kunming Medical University (Grant number: 2017FE468(-228)), by the Foundation of Yunnan Medical Science and Technology (Grant number: 2016NS124), and by the National Natural Science Foundation of China (Grant number: 81660472).

Compliance with ethical standards

Conflict of interest

The authors declare no conflicts of interest.

Ethical approval and ethical standards

The animal study was approved by the Animal Experimental Ethical Committee of Kunming Medical University (date of approval: June 2017). The experimental mice used in this study were obtained from the Laboratory Animal Center of Kunming Medical University. All experimental procedures were conducted according to the protocols approved by the National Institute of Health’s Guidelines for the Care and Use of Laboratory Animals. This article does not contain any studies with human participants performed by any of the authors.

Cell line authentication

Human CRC cell lines HCT116 and SW480 were obtained from the Institute of Zoology, Chinese Academy of Sciences (Kunming, China), and rat CRC CT26 cells were purchased from the Cell Bank of the Chinese Academy of Sciences (Shanghai, China). Cell Bank, Type Culture Collection, Chinese Academy of Sciences (CBTCCCAS) can provide the Certificate of STR Analysis.

Supplementary material

262_2018_2270_MOESM1_ESM.pdf (264 kb)
Supplementary material 1 (PDF 263 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Clinical LaboratoryThe Fourth Affiliated Hospital of Kunming Medical UniversityKunmingPeople’s Republic of China
  2. 2.The Third Affiliated Hospital of Kunming Medical University, Yunnan Cancer Hospital, Yunnan Cancer CenterKunmingPeople’s Republic of China
  3. 3.The Affiliated Children’s Hospital of Kunming Medical UniversityKunmingPeople’s Republic of China
  4. 4.Department of Cadre Medical Branch, Yunnan Cancer Hospital, Yunnan Cancer CenterThe Third Affiliated Hospital of Kunming Medical UniversityKunmingPeople’s Republic of China
  5. 5.Department of OncologyThe Fourth Affiliated Hospital of Kunming Medical UniversityKunmingPeople’s Republic of China
  6. 6.Department of General SurgeryThe Fourth Affiliated Hospital of Kunming Medical UniversityKunmingPeople’s Republic of China
  7. 7.Department of Laboratory ZoologyKunming Medical UniversityKunmingPeople’s Republic of China

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