Potentiating effect of reovirus on immune checkpoint inhibition in microsatellite stable colorectal cancer.

2022-10

Augustine, Titto

John, Peter

Friedman, Tyler

Jiffry, Jeeshan

Guzik, Hillary

Mannan, Rifat

Gupta, Riya

Delano, Catherine

Mariadason, John M

Zang, Xingxing

Maitra, Radhashree

Goel, Sanjay

anti-PD-1

colorectal cancer

combinatorial therapy

immune checkpoint

microsatellite instability

reovirus

translational

Journal Article

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10.3389/fonc.2022.1018767

The majority of colorectal cancers (CRCs) are microsatellite stable (MSS) and resistant to immunotherapy. The current study explores the possibility of using oncolytic reovirus to sensitize MSS CRC to immune checkpoint inhibition. While reovirus reduced metabolic activity among KRAS Mut cells, microarray/computational analysis revealed microsatellite status-oriented activation of immune-response pathways. Reovirus plus anti-PD-1 treatment increased cell death among MSS cells ex vivo. Reduced tumorigenicity and proliferative index, and increased apoptosis were evident among CT26 [MSS, KRAS Mut], but not in MC38 [microsatellite unstable/MSI, KRAS Wt] syngeneic mouse models under combinatorial treatment. PD-L1-PD-1 signaling axis were differentially altered among CT26/MC38 models. Combinatorial treatment activated the innate immune system, pattern recognition receptors, and antigen presentation markers. Furthermore, we observed the reduction of immunosuppressive macrophages and expansion of effector T cell subsets, as well as reduction in T cell exhaustion. The current investigation sheds light on the immunological mechanisms of the reovirus-anti-PD-1 combination to reduce the growth of MSS CRC.

link

Frontiers in Oncology 2022

Frontiers in Oncology