The role of monoglyceride lipase gene in promoting proliferation, metastasis, and free fatty acid accumulation in uveal melanoma cells.

Uveal melanoma is a malignant tumor originating from melanocytes in the eye's uvea, often detected during routine ophthalmic examinations due to its typically asymptomatic nature. Despite effective local treatments, up to 50% of patients develop hematogenous metastases, highlighting the need for better prognostic markers and therapeutic targets. In this study, we developed an innovative Metastasis-Related Gene Signature (MERGS) score to classify patients from various cohorts. By establishing this scoring method, we discovered underlying mechanisms responsible for significant differences between samples with high and low MERGS scores. We identified a set of ten genes to construct MERGS, which showed a high predictive accuracy for patient survival. Further, Monoglyceride Lipase (MGLL) emerged as the most important gene in distinguishing uveal melanoma metastasis. Functional studies demonstrated that knocking down MGLL significantly inhibited proliferation, invasion, and migration of uveal melanoma cells in vitro and in vivo, while overexpression of MGLL enhanced these malignant behaviors. Additionally, MGLL modulated free fatty acid (FFA) levels within these cells. Our findings reveal MGLL as a crucial player in uveal melanoma progression and propose it as a novel therapeutic target, potentially leading to improved management and outcomes for patients with this disease.