Animal-Free CHI3L1 Protein, Human (His)

Chitinase-3-like protein 1 (CHI3L1) is a carbohydrate-binding lectin with a specific affinity for chitin, although it lacks chitinase activity. Its main role extends beyond chitin degradation, as it is implicated in tissue remodeling and cellular responses to environmental changes. CHI3L1 plays a crucial role in T-helper cell type 2 (Th2) inflammatory responses and IL-13-induced inflammation, influencing allergen sensitization, inflammatory cell apoptosis, dendritic cell accumulation, and the differentiation of M2 macrophages. Additionally, it facilitates the invasion of pathogenic enteric bacteria into colonic mucosa and lymphoid organs. CHI3L1 is involved in the activation of the AKT1 signaling pathway, leading to IL8 production in colonic epithelial cells. Furthermore, it regulates antibacterial responses in the lungs, contributing to macrophage bacterial killing, controlling bacterial dissemination, and enhancing host tolerance. In lung tissues, CHI3L1 also plays a role in regulating hyperoxia-induced injury, inflammation, and epithelial apoptosis. Structurally, CHI3L1 functions as a monomer.