Proteomic Insights into Small Molecule Modulation on Caudal Fin Regeneration in Zebrafish

conditions. Due to their minuscule size, these molecules can seamlessly traverse tissues and cellular membranes, influencing key biological processes such as cellular growth, differentiation, and intracellular communication, which are crucial for tissue regeneration. The zebrafish serves as an excellent model for studying regenerative growth due to its remarkable ability to regrow amputated appendages. In this study, we systematically evaluated the effect of small molecules, including ethanol, glucose, and NaCl, on zebrafish caudal fin regeneration over a 7-day period. Regenerative growth analysis indicated delayed fin regrowth across all treated groups, with glucose exposure showing the most significant impairment. Behavioral assessments showed stress-induced locomotor alterations in treated groups, with the ethanol-exposed group exhibiting the most pronounced reduction in total distance moved and velocity. Proteomic profiling using label-free quantification identified 113, 257, and 178 differentially expressed proteins in ethanol, glucose, and NaCl-treated groups, respectively. Subsequent validation using the iTRAQ labeling approach confirmed 16 commonly dysregulated proteins across all conditions, highlighting a shared molecular response associated with stress and repair mechanisms. Pathway enrichment analysis mapped differentially expressed proteins to various canonical signaling pathways, including GP6 signaling, mitochondrial dysfunction, RHO GTPase cycling, antigen processing, and metabolic regulation. Pathway analysis further revealed associations with disease and function networks specific to each treatment condition. Our findings provide valuable insights into how metabolic and ionic perturbations influence zebrafish fin regeneration at the molecular level, offering a deeper understanding of tissue repair mechanisms under stressed conditions.