SPINK7 (serine peptidase inhibitor Kazal type 7) is a serine protease inhibitor that serves as a critical regulator of epithelial barrier function and inflammatory responses, particularly in the esophagus. The protein is normally part of the differentiation program of human esophageal epithelium and acts as an inhibitory checkpoint for inflammatory responses 1. SPINK7 functions by maintaining the balance between proteases and protease inhibitors, preventing excessive proteolytic activity that could compromise barrier integrity 2. Loss of SPINK7 expression leads to increased activity of urokinase plasminogen activator (uPA), barrier dysfunction, and production of proinflammatory cytokines including thymic stromal lymphopoietin (TSLP) 1. This dysregulation is clinically significant in eosinophilic esophagitis (EoE), where profound loss of SPINK7 expression occurs and contributes to disease pathogenesis 2. SPINK7 also functions as a tumor suppressor, with reduced expression observed in various cancers including esophageal and oral squamous cell carcinomas 34. Additionally, SPINK7 has been identified as a p53 transcriptional target involved in DNA damage response and apoptosis 3. In inflammatory bowel disease models, neutrophil-derived Spink7 provides protection against experimental colitis by controlling chemokine and cytokine production 5.