Targeting the Galectin-1/Ras Interaction for Treating Malignant Peripheral Nerve Sheath Tumors

Background: Neurofibromatosis type 1 (NF1) is a common inherited neurological disorder that can lead to the development of malignant peripheral nerve sheath tumors (MPNSTs), a highly aggressive form of sarcoma. Current treatment options for MPNSTs are limited, with poor prognosis and high recurrence rates. This study aims to explore the potential of targeting the Galectin-1 (Gal-1) and Ras interaction as a novel therapeutic strategy for MPNSTs. Methods: Molecular docking simulations were conducted to identify specific residues involved in the Gal-1 and H-Ras(G12V) interaction. LLS30, a compound designed to target the Ras binding pocket on Gal-1, was developed and tested. The efficacy of LLS30 was evaluated through in vitro assays, including cell viability, apoptosis, and co-immunoprecipitation studies, as well as in vivo assays using orthotopic MPNST xenograft and experimental lung metastasis models. Transcriptome sequencing was performed to analyze the impact of LLS30 on gene expression and signaling pathways. Results: Molecular docking revealed key residues involved in the Gal-1/Ras interaction, and LLS30 was shown to bind to these residues, disrupting the interaction. LLS30 treatment resulted in Ras delocalization from the plasma membrane and suppression of the Ras/Erk signaling pathway. In vitro, LLS30 significantly reduced MPNST cell proliferation and induced apoptosis. In vivo, LLS30 demonstrated potent anti-tumor activity, reducing tumor burden and metastasis while improving survival in animal models. Transcriptome analysis showed that LLS30 downregulates critical pathways, including KRAS signaling and epithelial-mesenchymal transition (EMT). Conclusions: Interference with the Gal-1/Ras interaction could lead to suppression of the Ras signaling pathway. LLS30 effectively disrupts the Gal-1/Ras interaction, resulting in significant anti-tumor and anti-metastatic effects in MPNST models. These findings indicated that targeting Gal-1 with LLS30 offers a promising therapeutic approach for treating MPNSTs and may also be applicable to other malignancies where Gal-1 and Ras are key oncogenic drivers.