GK5 (glycerol kinase 5) is a tissue-specific enzyme that catalyzes the phosphorylation of glycerol to produce sn-glycerol 3-phosphate, playing crucial roles in lipid metabolism and cellular signaling. The enzyme demonstrates context-dependent functions across different pathological conditions. In cancer, GK5 exhibits tumor suppressor properties, as its expression is downregulated in high-grade glioblastoma compared to low-grade tumors 1, and reduced GK5 levels promote proliferation in glioblastoma cells 1. Similarly, GK5 appears to inhibit metastasis and proliferation in renal clear cell carcinoma 2. However, in lung cancer, GK5 demonstrates opposing effects by conferring gefitinib resistance through the SREBP1/SCD1 signaling pathway, with higher GK5 expression associated with drug resistance 3. GK5 is also involved in lipid droplet synthesis, as exposure to environmental toxins like PM2.5 and cigarette smoke increases GK5 expression, leading to enhanced lipid droplet formation in alveolar epithelial cells 4. Additionally, GK5 expression changes are implicated in metabolic disturbances, with increased GK5 levels contributing to abnormal glycerol 3-phosphate accumulation in glycerophospholipid metabolism pathways 5. These findings suggest GK5 functions as a metabolic regulator with tissue-specific and context-dependent roles in disease pathogenesis.