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Drilling for oil : Tumor-surrounding adipocytes fueling cancer cells to support tumor progression.

Conference of Pr Catherine Muller-Staumont, IPBS, Toulouse

Lipid-filled mature adipocytes are frequently found in proximity to invasive human solid tumors such as breast and prostate cancers. At the tumor invasive front, adipocytes exhibit a decrease in size and lipid content, cells that we named Cancer associated Adipocytes (CAAs) (Dirat et al, Cancer Research, 2011). We further shown that CAAs release free fatty acids (FFAs) or fatty acids contained in extra-cellular vesicles and that these FFAs are taken up by tumor cells and used to promote tumor progression by mechanisms that include, but is not limited to, mitochondrial fatty acid oxidation (FAO) (Wang et al, JCI insight, 2017 ; Laurent et al, Molecular Cancer Research, 2019; Clement et al, EMBO J, 2020). I will discuss recent advances in our understanding of this metabolic symbiosis between adipocytes and cancer cells and underlines the differences in this metabolic crosstalk between the various types of cancer and their localization (including bone metastasis where the adipocytes present at proximity of cancer cells exhibit a peculiar phenotype, Attané et al, Cell Reports, 2020). The known association between obesity and cancer mortality clearly reinforces interest in this research area. Obesity is characterized by increased adipose depot size associated with changes at tissue level, including for adipocytes increased in lipid content and metabolic dysfunctions. We will see the emerging results showing that this state could affect metabolic symbiosis between tumor-surrounding adipocytes and cancer cells. Once well established, the metabolic symbiosis between cancer cells and adipocytes will undoubtedly offer new therapeutic avenues in the treatment of cancer in obese and nonobese patients.

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