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A stearate-rich diet and oleate restriction directly inhibit tumor growth via the unfolded protein response

Jumpei Ogura,Koji Yamanoi,Kentaro Ishida,Eijiro Nakamura,Shinji Ito,Naoki Aoyama,Yuki Nakanishi,T. Menju,Kosuke Kawaguchi,Y. Hosoe,Mana Taki,R. Murakami,Ken Yamaguchi,J. Hamanishi,Masaki Mandai

Published 2024 in Experimental and Molecular Medicine

ABSTRACT

Fatty acids are known to have significant effects on the properties of cancer cells. Therefore, these compounds have been incorporated into therapeutic strategies. However, few studies have examined the effects of individual fatty acids and their interactions in depth. This study analyzed the effects of various fatty acids on cancer cells and revealed that stearic acid, an abundant saturated fatty acid, had a stronger inhibitory effect on cell growth than did palmitic acid, which is also an abundant saturated fatty acid, by inducing DNA damage and apoptosis through the unfolded protein response (UPR) pathway. Intriguingly, the negative effects of stearate were reduced by the presence of oleate, a different type of abundant fatty acid. We combined a stearate-rich diet with the inhibition of stearoyl-CoA desaturase-1 to explore the impact of diet on tumor growth. This intervention significantly reduced tumor growth in both ovarian cancer models and patient-derived xenografts (PDXs), including those with chemotherapy resistance, notably by increasing stearate levels while reducing oleate levels within the tumors. Conversely, the negative effects of a stearate-rich diet were mitigated by an oleate-rich diet. This study revealed that dietary stearate can directly inhibit tumor growth through mechanisms involving DNA damage and apoptosis mediated by the UPR pathway. These results suggest that dietary interventions, which increase stearic acid levels while decreasing oleic acid levels, may be promising therapeutic strategies for cancer treatment. These results could lead to the development of new cancer treatment strategies. Obesity, characterized by excessive body fat, is linked to higher cancer risks. Researchers explored how specific fatty acids impact cancer growth. The study focused on palmitate, stearate, and oleate, using various cancer cell lines and patient derived xenograft. They found that stearate significantly inhibited cancer cell growth more than palmitate. This was a controlled experiment involving human cancer cell lines and mice fed specialized diets. Results showed that stearate induced DNA damage and cancer cell death, while oleate reduced these effects. The researchers concluded that dietary stearate could suppress tumor growth, especially when combined with inhibitors of fatty acid conversion. Future research could explore dietary interventions as potential cancer treatments. This summary was initially drafted using artificial intelligence, then revised and fact-checked by the author.

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