Artificial sweeteners and male infertility: Network toxicology and experimental evidence reveal FGFR1 as the critical target.

BACKGROUNDArtificial sweeteners (ASs) are widely used sugar substitutes, but chronic exposure is linked to male infertility. We integrated computational prediction, network analysis, and wet-lab validation to explore mechanisms.

METHODSSeven ASs were screened in AdmetSAR 3.0; high-confidence positives were prioritized. Targets were predicted by SwissTargetPrediction, SEA, and TargetNet, and intersected with the top 50 % GeneCards testicular-injury genes to define candidate targets. STRING PPI and enrichment analyses were performed, followed by machine-learning feature selection and independent dataset validation. Ligand-target binding was evaluated by molecular docking and 100-ns molecular dynamics (MD) simulations. Single-cell RNA-seq (Male Health Atlas) mapped core-gene expression across testicular clusters. TM3 Leydig cells were exposed to aspartame (0.5-2 mM) for 48 h and analyzed by RT-qPCR.

RESULTSAspartame, neotame, and sucralose showed high-confidence reproductive-toxicity signals. Ninety-one candidate targets were identified, and FGFR1 emerged as the core gene with good discrimination in two datasets. Docking and MD supported stable AS-FGFR1 binding, especially for aspartame. FGFR1 was enriched in Leydig and vascular-associated cells. Aspartame upregulated FGFR1, DUSP6, and SPRY2 and downregulated STAR.

CONCLUSIONSFGFR1-associated signaling may link AS exposure to impaired male reproductive function, warranting in vivo and protein-level validation.