This study aimed to identify markers of cellular senescence in injured kidney tissue using imaging mass cytometry (IMC). Human kidney cells (HK-2 cells) were treated with cyclosporine A (Cs-A) to induce senescence, then stained with an anti-p21 antibody. The p21 antibody signal increased with Cs-A treatment and was localized to the cell cytoplasm. Future work will include validating increased p21 expression through PCR and western blotting. The goal is to use IMC to detect p21 in injured and control human kidney biopsy samples to better understand acute kidney injury and senescence.