Consequences of the Hsp110DE9 mutation in tumorigenesis and the 5-fluorouracil-based chemotherapy response in Msh2-deficient mice

Kathleen Noel; A 'dem Bokhari; Romane Bertrand; Florence Renaud; Pierre Bourgoin; Romain Cohen; Magali Svrcek; Anne-Christine Joly; Alex Duval; Ada Collura

doi:10.1007/s00018-022-04293-3

Consequences of the Hsp110DE9 mutation in tumorigenesis and the 5-fluorouracil-based chemotherapy response in Msh2-deficient mice

Cell Mol Life Sci. 2022 Jun 1;79(6):332. doi: 10.1007/s00018-022-04293-3.

Authors

Kathleen Noel¹, A 'dem Bokhari¹, Romane Bertrand¹, Florence Renaud¹, Pierre Bourgoin¹, Romain Cohen^{1

2}, Magali Svrcek^{1

3}, Anne-Christine Joly⁴, Alex Duval¹, Ada Collura⁵

Affiliations

¹ Sorbonne Université, UPMC Univ Paris 06, INSERM, UMRS 938, SIRIC CURAMUS, Equipe Instabilité Des Microsatellites Et Cancer, Equipe Labellisée Par La Ligue Contre Le Cancer, Centre de Recherche Saint Antoine, 75012, Paris, France.
² Sorbonne Université, Service D'oncologie Médicale, Hôpital Saint-Antoine, AP-HP, 75012, Paris, France.
³ Sorbonne Université, Laboratoire D'anatomie Et Cytologie Pathologiques, Hôpital Saint-Antoine, AP-HP, 75012, Paris, France.
⁴ UPAC and C (Unité De Préparation Des Anticancéreux Et Contrôle), Saint Antoine Hospital, AP-HP, Paris, France.
⁵ Sorbonne Université, UPMC Univ Paris 06, INSERM, UMRS 938, SIRIC CURAMUS, Equipe Instabilité Des Microsatellites Et Cancer, Equipe Labellisée Par La Ligue Contre Le Cancer, Centre de Recherche Saint Antoine, 75012, Paris, France. ada.collura@inserm.fr.

Abstract

Heat shock proteins (HSPs) play oncogenic roles in human tumours. We reported a somatic inactivating mutation of HSP110 (HSP110DE9) in mismatch repair-deficient (dMMR) cancers displaying microsatellite instability (MSI) but did not assess its impact. We evaluated the impact of the Hsp110DE9 mutation on tumour development and the chemotherapy response in a dMMR knock-in mouse model (Hsp110DE9^KIMsh2^KO mice). The effect of the Hsp110DE9 mutation on tumorigenesis and survival was evaluated in Msh2^KO mice that were null (Hsp110^wt), heterozygous (Hsp110DE9^KI/+), or homozygous (Hsp110DE9^KI/KI) for the Hsp110DE9 mutation by assessing tumoral syndrome (organomegaly index, tumour staging) and survival (Kaplan-Meier curves). 5-Fluorouracil (5-FU), which is the backbone of chemotherapy regimens in gastrointestinal cancers and is commonly used in other tumour types but is not effective against dMMR cells in vivo, was administered to Hsp110DE9^KI/KI, Hsp110DE9^KI/+, and Hsp110^wtMsh2^KO mice. Hsp110, Ki67 (proliferation marker) and activated caspase-3 (apoptosis marker) expression were assessed in normal and tumour tissue samples by western blotting, immunophenotyping and cell sorting. Hsp110^wt expression was drastically reduced or totally lost in tumours from Msh2^KOHsp110DE9^KI/+ and Msh2^KOHsp110DE9^KI/KI mice. The Hsp110DE9 mutation did not affect overall survival or tumoral syndrome in Msh2^KOHsp110DE9^KI/+ and Msh2^KOHsp110DE9^KI/KI mice but drastically improved the 5-FU response in all cohorts (Msh2^KOHsp110DE9^KI/KI: P_5fu = 0.001; Msh2^KOHsp110DE9^KI/+: P_5fu = 0.005; Msh2^KOHsp110^wt: P_5fu = 0.335). Histopathological examination and cell sorting analyses confirmed major hypersensitization to 5-FU-induced death of both Hsp110DE9^KI/KI and Hsp110DE9^KI/+ dMMR cancer cells. This study highlights how dMMR tumour cells adapt to HSP110 inactivation but become hypersensitive to 5-FU, suggesting Hsp110DE9 as a predictive factor of 5-FU efficacy.

Keywords: 5-FU chemotherapy; Hsp110; MMR deficiency; Microsatellite instability; Mouse model.

MeSH terms

Animals
Carcinogenesis / genetics
Fluorouracil* / therapeutic use
HSP110 Heat-Shock Proteins* / genetics
Mice
Microsatellite Instability
Mutation
Neoplasms* / drug therapy
Neoplasms* / genetics

Substances

HSP110 Heat-Shock Proteins
Fluorouracil