한빛사논문
Joonbeom Bae1,7, Longchao Liu1,7, Casey Moore1,2,7, Eric Hsu1,2, Anli Zhang1, Zhenhua Ren1, Zhichen Sun1,3, Xue Wang1, Jiankun Zhu1, Jiao Shen4,5, Jian Qiao1 & Yang-Xin Fu1,6
1Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
2Department of Immunology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
3Department of Pharmacology, Harold C. Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX, USA.
4Key Laboratory of Infection and Immunity, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.
5University of Chinese Academy of Sciences, Beijing, China.
6Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China.
7These authors contributed equally to this work: Joonbeom Bae, Longchao Liu, Casey Moore.
Corresponding authors : Correspondence to Jian Qiao or Yang-Xin Fu.
Abstract
Immune checkpoint blockade (ICB)-based immunotherapy depends on functional tumour-infiltrating lymphocytes (TILs), but essential cytokines are less understood. Here we uncover an essential role of endogenous IL-2 for ICB responsiveness and the correlation between insufficient IL-2 signalling and T-cell exhaustion as tumours progress. To determine if exogenous IL-2 in the tumour microenvironment can overcome ICB resistance, we engineered mesenchymal stem cells (MSCs) to successfully deliver IL-2 mutein dimer (SIL2-EMSC) to TILs. While MSCs have been used to suppress inflammation, SIL2-EMSCs elicit anti-tumour immunity and overcome ICB resistance without toxicity. Mechanistically, SIL2-EMSCs activate and expand pre-existing CD8+ TILs, sufficient for tumour control and induction of systemic anti-tumour effects. Furthermore, engineered MSCs create synergy of innate and adaptive immunity. The therapeutic benefits of SIL2-EMSCs were also observed in humanized mouse models. Overall, engineered MSCs rejuvenate CD8+ TILs and thus potentiate ICB and chemotherapy.
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