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PTPN3 expressed in activated T lymphocytes is a candidate for a non-antibody-type immune checkpoint inhibitor

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Abstract

It has been shown that protein tyrosine phosphatase non-receptor type (PTPN) 3 inhibits T-cell activation. However, there is no definitive conclusion about how the inhibition of PTPN3 in lymphocytes affects immune functions in human lymphocytes. In the present study, we showed that PTPN3 inhibition significantly contributes to the enhanced activation of activated human lymphocytes. The PTPN3 expression of lymphocytes was significantly increased through the activation process using IL-2 and anti-CD3 mAb. Interestingly, inhibiting the PTPN3 expression in activated lymphocytes significantly augmented the proliferation, migration, and cytotoxicity through the phosphorylation of zeta-chain-associated protein kinase 70 (ZAP-70), lymphocyte-specific protein tyrosine kinase (LCK), and extracellular signal-regulated kinases (ERK). Lymphocyte activation by PTPN3 inhibition was observed only in activated CD3+ T cells and not in NK cells or resting T cells. In therapy experiments using autologous tumors and lymphocytes, PTPN3 inhibition significantly augmented the number of tumor-infiltrated lymphocytes and the cytotoxicity of activated lymphocytes. Our results strongly imply that PTPN3 acts as an immune checkpoint in activated lymphocytes and that PTPN3 inhibitor may be a new non-antibody-type immune checkpoint inhibitor for cancer therapy.

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Abbreviations

DALs:

DC-stimulated activated lymphocytes

ERK:

Extracellular signal-regulated kinases

GAPDH:

Glyceraldehyde-3-phosphate dehydrogenase

LCK:

Lymphocyte-specific protein tyrosine kinase

MOI:

Multiplicity of infection

ntTILs:

Non-tumor-tissue-infiltrating-administrated lymphocytes

PTP:

Protein tyrosine phosphatase

PTPN:

Protein tyrosine phosphatase non-receptor type

shRNA:

Short hairpin RNA

Zap-70:

Zeta-chain-associated protein kinase 70

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Acknowledgements

We thank Ms. Emi Onishi for skillful technical assistance.

Funding

This study was supported by the Japan Society for the Promotion of Science KAKENHI Grant Numbers JP15K10055, JP17H04283, and JP18K08682.

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Authors and Affiliations

Authors

Contributions

AF was involved in the analysis of all experiments. KN, AI, and MK were involved in the gene transfection. YO and SI were involved in the interpretation of data. MU and NK were involved in the acquisition and analysis of data. TM, TN, and HO were involved in the design of the work.

Corresponding author

Correspondence to Hideya Onishi.

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Conflict of interest

The authors declare that they have no conflicts of interest.

Ethical approval and ethical standards

All procedures performed in studies involving human participants were in accordance with the ethical standards of the Kyushu University Ethics Committee (study approval numbers 29-251 and 28-277) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. All procedures performed in studies involving animals were in accordance with the ethical standards of the Animal Care and Use Committee of Kyushu University (study approval numbers A29-376-0 and A29-333-0).

Informed consent

Written informed consent was obtained from all participants included in the study to the use of their PBMC and tumor specimen for research and for publication before blood collection.

Animal source

All mice were obtained from Charles River Laboratories Japan, Yokohama, Japan.

Cell line authentication

SUIT-2 is a human pancreatic ductal adenocarcinoma cell line, and SCC-9 is a human tongue squamous cell carcinoma cell line. Both cell lines were purchased from American Type Culture Collection (ATCC) previously and were stored in liquid nitrogen. All cell lines were cultured for no more than 2–3 weeks after thawing, routinely checked for mycoplasma infection while cultured, and showed consistent phenotypes by microscopy prior to in vitro and in vivo experiments.

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Fujimura, A., Nakayama, K., Imaizumi, A. et al. PTPN3 expressed in activated T lymphocytes is a candidate for a non-antibody-type immune checkpoint inhibitor. Cancer Immunol Immunother 68, 1649–1660 (2019). https://doi.org/10.1007/s00262-019-02403-y

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  • DOI: https://doi.org/10.1007/s00262-019-02403-y

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