CREB3 (cAMP responsive element binding protein 3) is a transcription factor that plays critical roles in cellular stress responses and disease pathogenesis. The protein functions as a DNA-binding transcription activator for RNA polymerase II and is activated through regulated intramembrane proteolysis in the endoplasmic reticulum membrane during ER stress conditions 1. CREB3 serves as a key regulator in the unfolded protein response and integrated stress response signaling pathways, with cellular localization spanning the cytosol, nucleus, endoplasmic reticulum, and Golgi apparatus. The protein exhibits significant disease relevance, particularly in cancer where CREB3 family members modulate tumor onset and progression 1. In anaplastic thyroid carcinoma, CREB3L1 promotes tumor growth and metastasis by remodeling the tumor microenvironment through extracellular matrix signaling activation 2. Notably, CREB3 shows protective effects in amyotrophic lateral sclerosis (ALS), where gain-of-function variants like CREB3R119G decrease ALS risk and slow motor progression 3. The protein also contributes to cardiovascular and metabolic disease regulation 4 and has been implicated in ciliopathy phenotypes 5. CREB3's therapeutic potential spans multiple disease contexts, from cancer treatment targets to neuroprotective strategies.