Abstract:
:The alarmin IL-33 is an IL-1 family member that stimulates pleiotropic immune reactions depending on the target tissue and microenvironmental factors. In this study, we have investigated the role of IL-33/ST2 axis in antitumor response to melanoma. Injection of IL-33 in mice-bearing subcutaneous B16.F10 melanoma resulted in significant tumor growth delay. This effect was associated with intratumoral accumulation of CD8+ T cells and eosinophils, decrease of immunosuppressive myeloid cells, and a mixed Th1/Th2 cytokine expression pattern with local and systemic activation of CD8+ T and NK cells. Moreover, intranasal administration of IL-33 determined ST2-dependent eosinophil recruitment in the lung that prevented the onset of pulmonary metastasis after intravenous injection of melanoma cells. Accordingly, ST2-deficient mice developed pulmonary metastasis at higher extent than wild-type counterparts, associated with lower eosinophil frequencies in the lung. Of note, depletion of eosinophils by in vivo treatment with anti-Siglec-F antibody abolished the ability of IL-33 to both restrict primary tumor growth and metastasis formation. Finally, we show that IL-33 is able to activate eosinophils resulting in efficient killing of target melanoma cells, suggesting a direct antitumor activity of eosinophils following IL-33 treatment. Our results advocate for an eosinophil-mediated antitumoral function of IL-33 against melanoma, thus opening perspectives for novel cancer immunotherapy strategies.
journal_name
Oncoimmunologyjournal_title
Oncoimmunologyauthors
Lucarini V,Ziccheddu G,Macchia I,La Sorsa V,Peschiaroli F,Buccione C,Sistigu A,Sanchez M,Andreone S,D'Urso MT,Spada M,Macchia D,Afferni C,Mattei F,Schiavoni Gdoi
10.1080/2162402X.2017.1317420subject
Has Abstractpub_date
2017-04-20 00:00:00pages
e1317420issue
6eissn
2162-4011issn
2162-402Xpii
1317420journal_volume
6pub_type
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