Hippurate, 3-hydroxyphenyl-acetic acid, and 2,4,6-trihydroxybenzoic acid monohydrate treated NK cells (2x105 cells per dose, duplicate) were isolated to determine Smad4 gene expression, Total mRNA was reverse-transcribed using iScript RT Supermix (Bio-Rad, Hercules, CA, USA). PCR was performed as described previously (40 (link)–42 (link)) with iTaq Univer SYBR Green Supermix (Bio-Rad). Human Smad4 primers were purchased from Integrated DNA Technologies (IDT), Inc. (Coralville, IA, USA). Relative expression of a gene in cells was determined by comparing the threshold cycle (Ct) of the gene against the Ct of a housekeeping gene, Gapdh.
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