Microbiota-Derived Short-Chain Fatty Acids Boost Antitumoral Natural Killer Cell Activity

Area of Science:

• Immunology
• Microbiome Research
• Cancer Biology

Background:

• The gut microbiota influences host immunity and homeostasis through metabolites like short-chain fatty acids (SCFAs).
• Emerging evidence links gut microbiome composition and metabolites to cancer, yet their impact on antitumor responses is understudied.
• Natural killer (NK) cells are crucial for antitumor immunity, directly eliminating tumor cells.

Purpose of the Study:

• To investigate the effects of SCFAs on the antitumoral activity of NK cells.
• To explore the potential of SCFAs as modulators of NK cell-mediated cancer defense.

Main Methods:

• Utilized the NK-92 cell line to assess SCFA impact on NK cell function.
• Measured NK cell cytotoxicity against cancer cells.
• Analyzed the secretion of cytokines and extracellular vesicles.

Main Results:

• SCFAs significantly boosted the antitumoral activity of NK cells.
• SCFAs induced the release of NK cell extracellular vesicles.
• SCFAs reduced the secretion of the anti-inflammatory cytokine IL-10 and increased NK cell cytotoxicity against multiple myeloma cells.

Conclusions:

• SCFAs demonstrate substantial potential in enhancing NK cell-mediated antitumor defense.
• Modulating SCFA production could represent a novel strategy in cancer immunotherapy.
• This study provides novel insights into the interplay between microbial metabolites and cellular antitumor immunity.