Fig. 4: CXCL7 upregulates PHGDH and activates serine metabolism in cancer cells. | Cell Death & Disease

Fig. 4: CXCL7 upregulates PHGDH and activates serine metabolism in cancer cells.

From: Chemotherapy-induced macrophage CXCL7 expression drives tumor chemoresistance via the STAT1/PHGDH-serine metabolism axis and SAM paracrine feedback to M2 polarization

Fig. 4

A Left: GSEA of enriched pathways in differentially expressed genes (DEGs) between HT29-control and HT29-CXCL7 groups. Right: Comparative analysis of PHGDH FPKM values between groups. B The expression level of PHGDH in control and CXCL7-overexpressing cells with or without the CXCR2 inhibitor, as determined by RT-qPCR. C Western blot detection of serine biosynthesis enzymes (PHGDH, PSAT1, PSPH).GAPDH was used as the loading control. D Kaplan‒Meier analysis of overall survival in TCGA-CRC patients stratified by PHGDH expression. E Left: Metabolite enrichment pathway bubble plot. Middle: Heatmap of differential metabolites. Right: Schematic of serine/one-carbon metabolism. F Heatmap visualization of DEGs in glycine, serine, and threonine metabolism pathways. G ELISA analysis of SAM levels in CXCL7-overexpressing cells and PHGDH-inhibited cells. H TUNEL assays of CXCL7-overexpressing cells transfected with NC-siRNA or PHGDH-siRNA, with or without SAM treatment(scale bar, 50 μm). I The drug sensitivity of CXCL7-overexpressing cells transfected with NC-siRNA or PHGDH-siRNA, with or without SAM treatment. All data are presented as mean ± SD. *P < 0.05; n.s.not significant.

Back to article page