GSF3, a polysaccharide from guava (Psidium guajava L.) seeds, inhibits MCF-7 breast cancer cell growth via increasing Bax/Bcl-2 ratio or Fas mRNA expression levels.

International Journal of Biological Macromolecules
Hsiao-Chien Lin, Jin-Yuarn Lin

Abstract

Guava seed polysaccharide fraction 3 (GSF3) is an immunomodulatory polysaccharide from guava (Psidium guajava L.) seed polysaccharides. However, effects of GSF3 on the growth of breast cancer cells were not understood, yet. To clarify the GSF3 effects on breast cancer cell growth, GSF3 was subjected to treat MCF-7 cells using direct action or indirect immunotherapy using immune cells conditioned media, respectively. The viabilities of MCF-7 cells were measured using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. Changes in pro-(Bax)/anti-apoptotic (Bcl-2) and Fas mRNA expression levels in the treated MCF-7 cells were measured using two-step reverse transcription quantitative polymerase chain reaction. Our results showed that GSF3 inhibited MCF-7 cell growth through either direct action or indirect immunotherapy. GSF3 direct action significantly (P < 0.05) decreased Bcl-2 mRNA expression amount but increased pro-(Bax)/anti-apoptotic (Bcl-2) mRNA expression ratios in the treated cells. The splenocytes conditioned media cultured with GSF3 increased Fas mRNA expression amounts in the treated MCF-7 cells. There was a significant negative correlation between Th2-polarized cytokines secreted by immune cells and Fa...Continue Reading

Citations

Jul 23, 2021·Critical Reviews in Food Science and Nutrition·Sarah JamiesonAnupam Bishayee

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