MPPED2 (metallophosphoesterase domain containing 2) functions as a tumor suppressor protein with low metallophosphoesterase activity 1. The protein displays phosphoric diester hydrolase activity and can bind cyclic nucleotides and manganese ions, consistent with its metallophosphoesterase domain structure. MPPED2 appears to regulate cell proliferation and migration through modulation of the PTEN/Akt signaling pathway 1. In cancer contexts, MPPED2 expression is frequently downregulated, likely due to promoter hypermethylation, and this downregulation correlates with poor prognosis across multiple cancer types 2. Restoration of MPPED2 expression in cancer cell lines reduces cell growth and migration, and enhances sensitivity to chemotherapy agents like temozolomide 2. The gene also shows clinical significance in non-cancer contexts, with genetic variants associated with kidney function in hypertensive patients and cardiovascular disease risk 3. Additionally, MPPED2 has been implicated in migraine susceptibility, particularly migraine with aura 4. Recent evidence suggests MPPED2 may regulate autophagy and proliferation in reproductive tissues through PI3K/AKT pathway modulation 5. Overall, MPPED2 appears to function as a multifaceted regulatory protein involved in cellular growth control and metabolic processes.