A Review of Limbic System-Associated Membrane Protein in Tumorigenesis

Area of Science:

• Neuroscience and Oncology
• Cell Adhesion Molecules
• Tumor Suppressor Genes

Background:

• Limbic system-associated membrane protein (LSAMP) is an IgLON superfamily cell-adhesion molecule crucial for neural development and synaptic plasticity.
• Aberrant LSAMP expression is linked to neuropsychiatric disorders and influences brain plasticity and hypothalamic modulation.

Purpose of the Study:

• To review the role of LSAMP in normal physiology and pathophysiology.
• To explore LSAMP's implications in oncogenesis across various cancers.
• To examine the contribution of LSAMP gene defects to cancer development.

Main Methods:

• Systematic review of research articles on LSAMP's function in malignancies.
• Analysis of studies reporting LSAMP's role in clear cell renal cell carcinoma, prostatic adenocarcinoma, lung adenocarcinoma, osteosarcoma, neuroblastoma, AML, and epithelial ovarian cancer.
• Examination of LSAMP gene function defects in oncogenesis.

Main Results:

• LSAMP functions as a putative tumor suppressor; its loss correlates with aggressive phenotypes and metastatic disease.
• Loss of LSAMP facilitates epithelial-mesenchymal transition (EMT), promoting cell migration and metastasis.
• LSAMP modulates RTK pathways, influencing tumorigenesis via RTK expression and downstream signaling (ERK, Akt, β-catenin).

Conclusions:

• LSAMP is a tumor suppressor protein whose loss promotes EMT and metastasis in various cancers.
• LSAMP's role in RTK modulation is significant in oncogenesis.
• LSAMP defects are associated with aggressive and metastatic disease, highlighting its clinical relevance.