Characterization of Immunolocalization of IP3R-1 in Skin Epithelium and its Changes in Non-Melanoma Skin Cancer: An Immuno-Histochemical and Clinical-Pathological Study

BACKGROUND: The calcium ion (Ca 2+ ) signaling is a fundamental cellular process vital for proliferation and differentiation. Its dysregulation is a recognized driver of carcinogenesis, contributing to uncontrolled cellular growth, survival, and metastasis. The inositol 1,4,5-triphosphate receptor (IP3R), a pivotal Ca 2+ channel located primarily on the endoplasmic reticulum, is critical for mediating intracellular Ca 2+ release and is implicated in cancer development. AIM AND OBJECTIVES: To evaluate the immunolocalization of IP3R-1 in normal skin, squamous cell dysplasia, squamous cell carcinoma (SCC), and basal cell carcinoma (BCC), and to determine its association with clinicopathological features such as genesis, infiltration, differentiation, and aggressiveness. PATIENTS AND METHODS: This investigation employed a descriptive and analytical study design to examine IP3R-1 expression within human tissue samples. The methodology involved collecting and analyzing archival specimens from patients diagnosed with non-melanoma skin cancers and pre-malignant lesions, as well as normal skin samples for comparative assessment. The role of IP3R-1 in skin cancer was assessed by immunohistochemistry. Expression patterns were analyzed using an IP3R-1 antibody and correlated with clinicopathological data. RESULTS: Immunohistochemical analysis revealed distinct patterns of IP3R-1 expression. IP3R-1 was consistently expressed within the basal layer of normal epidermis, but was absent in suprabasal cells. A marked increase in IP3R-1 expression was observed in atypical cells within dysplastic lesions. Furthermore, significant overexpression of IP3R-1 was evident in SCC and BCC, irrespective of histological subtype or differentiation. However, no correlation was found between IP3R-1 expression and clinicopathological features. LIMITATIONS: The findings lack confirmation through direct molecular assays and are based solely on immunohistochemical expression. CONCLUSION: These findings strongly suggest that IP3R-1 plays a significant role in the development and progression of skin cancer, with its altered expression observed early in carcinogenesis. Nevertheless, its expression does not correlate with typical clinical-pathological aspects of neoplasia.