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Nanofitins targeting heat shock protein 110: an innovative immunotherapeutic modality in cancer.

Abstract : The presence of an inactivating HSP110 mutation in colorectal cancers has been correlated with an excellent prognosis and with the ability of HSP110 to favor the formation of tolerogenic (M2-like) macrophages. These clinical and experimental results suggest a potentially powerful new strategy against colorectal cancer: the inhibition of HSP110. In this work, as an alternative to neutralizing antibodies, Nanofitins (scaffold ~7 kDa-proteins) targeting HSP110 were isolated from the screening of a synthetic Nanofitin library, and their capacity to bind (immunoprecipitation, biolayer interferometry) and to inhibit HSP110 was analyzed in vitro and in vivo. Three Nanofitins were found to inhibit HSP110 chaperone activity. Interestingly, they share a high degree of homology in their variable domain and target the peptide-binding domain of HSP110. In vitro, they inhibited the ability of HSP110 to favor M2-like macrophages. The Nanofitin with the highest affinity, A-C2, was studied in the CT26 colorectal cancer mice model. Our PET/Scan experiments demonstrate that A-C2 may localized within the tumor area, in accord with the reported HSP110 abundance in the tumor microenvironment. A-C2 treatment reduced tumor growth, and was associated with an increase in immune cells infiltrating the tumor and particularly cytotoxic macrophages. These results were confirmed in a chicken chorioallantoic membrane tumor model. Finally, we showed the complementarity between A-C2 and an anti-PD-L1 strategy in the in vivo and in ovo tumor models. Altogether, Nanofitins appear to be promising new immunotherapeutic lead compounds.
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https://hal.inrae.fr/hal-03144438
Contributor : Sabine Julien <>
Submitted on : Wednesday, February 17, 2021 - 3:58:45 PM
Last modification on : Wednesday, March 31, 2021 - 11:10:10 AM

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Guillaume Marcion, François Hermetet, F. Neiers, Burhan Uyanik, Lucile Dondaine, et al.. Nanofitins targeting heat shock protein 110: an innovative immunotherapeutic modality in cancer.. International Journal of Cancer, Wiley, In press, pp.33485. ⟨10.1002/ijc.33485⟩. ⟨hal-03144438⟩

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