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Boustani J, Lecoester B, Baude J, Latour C, Limagne E, Ladjohoulou R, Morgand V, Froidurot L, Ghiringhelli F, Truc G, Adotévi O, Mirjolet C. Targeting two radiation-induced immunosuppressive pathways to improve the efficacy of normofractionated radiation therapy in a preclinical colorectal cancer model. Int J Radiat Biol 2024:1-10. [PMID: 38506658 DOI: 10.1080/09553002.2024.2331115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Accepted: 03/07/2024] [Indexed: 03/21/2024]
Abstract
PURPOSE We have previously demonstrated in a murine colorectal cancer model that normofractionated RT (normoRT: 18 × 2 Gy) induced MDSC infiltration and PD-L1 expression, while hypofractionated RT (hypoRT: 3 × 8 Gy) induced Treg. Here, we wanted to assess whether the association of normoRT with treatments that target two radiation-induced immunosuppressive pathways (MDSC and PD-L1) could improve tumor control. MATERIALS AND METHODS Subcutaneous tumors were induced using colon tumor cells (CT26) in immunocompetent mice (BALB/c) and were treated with RT alone (18 × 2 Gy or 3 × 8 Gy), or concomitantly with 5-Fluorouracil (5FU) (10 mg/kg) to deplete MDSC, and/or anti-PD-L1 (10 mg/kg). We assessed the impact of these combinations on tumor growth and immune cells infiltration by flow cytometry. In addition, we performed tumor rechallenge experiments and IFN-γ ELISpots to study the long-term memory response. RESULTS Even though tumor growth was significantly delayed in the RT + 5FU compared to 5FU and untreated groups (p < .05), there was no significant difference between RT + 5FU (CRT) and RT alone. The rate of MDSC increased significantly 1 week after the end of normoRT (8.09% ± 1.03%, p < .05) and decreased with the addition of 5FU (3.39% ± 0.69%, p < .05). PD-L1 expressing tumor cells were increased after treatment. Adding anti-PD-L1 significantly delayed tumor growth, achieved the highest complete response rate, and induced a long-lasting protective specific anti-tumor immunity. CONCLUSIONS These results tend to demonstrate the interest of inhibiting two radiation-induced immunosuppressive mechanisms. In patients, the combination of normoRT with 5FU is already the standard of care in locally advanced rectal cancer. Adding an anti-PD-L1 to this treatment could show promising results.
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Affiliation(s)
- Jihane Boustani
- Department of Radiation Oncology, University Hospital of Besançon, Besançon, France
- INSERM, EFS BFC, UMR1098, RIGHT, Interactions Greffon-Hôte-Tumeur/Ingénierie Cellulaire et Génique, University of Bourgogne Franche-Comté, Besançon, France
| | - Benoit Lecoester
- INSERM, EFS BFC, UMR1098, RIGHT, Interactions Greffon-Hôte-Tumeur/Ingénierie Cellulaire et Génique, University of Bourgogne Franche-Comté, Besançon, France
| | - Jérémy Baude
- Department of Radiation Oncology, Centre George François Leclerc, Dijon, France
| | - Charlène Latour
- INSERM UMR 1231, Dijon, France
- Cancer Biology Research Platform, Unicancer-Georges-Francois Leclerc Cancer Center, Dijon, France
| | - Emeric Limagne
- INSERM UMR 1231, Dijon, France
- Cancer Biology Research Platform, Unicancer-Georges-Francois Leclerc Cancer Center, Dijon, France
| | - Riad Ladjohoulou
- INSERM UMR 1231, Dijon, France
- Cancer Biology Research Platform, Unicancer-Georges-Francois Leclerc Cancer Center, Dijon, France
| | - Véronique Morgand
- INSERM UMR 1231, Dijon, France
- Cancer Biology Research Platform, Unicancer-Georges-Francois Leclerc Cancer Center, Dijon, France
| | - Lisa Froidurot
- INSERM UMR 1231, Dijon, France
- Cancer Biology Research Platform, Unicancer-Georges-Francois Leclerc Cancer Center, Dijon, France
| | - François Ghiringhelli
- INSERM UMR 1231, Dijon, France
- Cancer Biology Research Platform, Unicancer-Georges-Francois Leclerc Cancer Center, Dijon, France
| | - Gilles Truc
- Department of Radiation Oncology, Centre George François Leclerc, Dijon, France
- Cancer Biology Research Platform, Unicancer-Georges-Francois Leclerc Cancer Center, Dijon, France
| | - Olivier Adotévi
- INSERM, EFS BFC, UMR1098, RIGHT, Interactions Greffon-Hôte-Tumeur/Ingénierie Cellulaire et Génique, University of Bourgogne Franche-Comté, Besançon, France
- Department of Medical Oncology, University Hospital of Besançon, Besançon, France
| | - Céline Mirjolet
- INSERM UMR 1231, Dijon, France
- Cancer Biology Research Platform, Unicancer-Georges-Francois Leclerc Cancer Center, Dijon, France
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Laurent PA, Kownacka A, Boidot R, Limagne E, Morgand V, Froidurot L, Aubignac L, Ghiringhelli F, Créhange G, Mirjolet C. Influence du haut-débit de dose de radiothérapie externe en technique FFF sur la réponse immune antitumorale. Cancer Radiother 2019. [DOI: 10.1016/j.canrad.2019.07.057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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