The Anti-Tumorigenic Role of Cannabinoid Receptor 2 in Non-Melanoma Skin Cancer

Jennifer Ana Iden, Bitya Raphael-Mizrahi, Aaron Naim, Albert Kolomansky, Tamar Liron, Drorit Neumann, Marilena Vered, Yankel Gabet*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Five million non-melanoma skin cancers occur globally each year, and it is one of the most common malignant cancers. The dysregulation of the endocannabinoid system, particularly cannabinoid receptor 2 (CB2), is implicated in skin cancer development, progression, and metastasis. Comparing wildtype (WT) to systemic CB2 knockout (CB2-/-) mice, we performed a spontaneous cancer study in one-year old mice, and subsequently used the multi-stage chemical carcinogenesis model, wherein cancer is initiated by 7,12-dimethylbenz[a]anthracene (DMBA) and promoted by 12-O-tetradecanoylphorbol-13-acetate (TPA). We found that aging CB2-/- mice have an increased incidence of spontaneous cancerous and precancerous skin lesions compared to their WT counterparts. In the DMBA/TPA model, CB2-/- developed more and larger papillomas, had decreased spontaneous regression of papillomas, and displayed an altered systemic immune profile, including upregulated CD4+ T cells and dendritic cells, compared to WT mice. Immune cell infiltration in the tumor microenvironment was generally low for both genotypes, although a trend of higher myeloid-derived suppressor cells was observed in the CB2-/- mice. CB2 expression in carcinogen-exposed skin was significantly higher compared to naïve skin in WT mice, suggesting a role of CB2 on keratinocytes. Taken together, our data show that endogenous CB2 activation plays an anti-tumorigenic role in non-melanoma skin carcinogenesis, potentially via an immune-mediated response involving the alteration of T cells and myeloid cells coupled with the modulation of keratinocyte activity.

Original languageEnglish
Article number7773
JournalInternational Journal of Molecular Sciences
Volume24
Issue number9
DOIs
StatePublished - May 2023

Funding

FundersFunder number
Emerson Collective Cancer Research Fund
Israel Science Foundation1086/17

    Keywords

    • T cells
    • cannabinoid receptor 2
    • myeloid-derived suppressor cells
    • non-melanoma skin cancer
    • tumor microenvironment
    • tumor regression

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