Light-Inducible Spatio-Temporal Control of TLR4 and NF-κB-Gluc Reporter in Human Pancreatic Cell Line

Area of Science:

• Optogenetics
• Molecular Biology
• Cancer Research

Background:

• Augmented Toll-like receptor 4 (TLR4) expression is prevalent in pancreatic adenocarcinoma, correlating with increased tumorigenesis.
• TLR4 signaling pathways, including NF-κB and ERK1/2, are implicated in cancer progression.

Purpose of the Study:

• To engineer a novel optogenetic cell line for precise spatiotemporal control of TLR4 activation.
• To investigate the role of TLR4 in pancreatic cancer cell behavior using light-inducible activation.

Main Methods:

• Development of a TLR4-LOV fusion protein within the PANC-1 cell line for optogenetic control.
• Utilizing blue light to induce homodimerization and activate NF-κB and ERK1/2 signaling pathways.
• Performing phenotypic cell-based assays in 2D and 3D cultures to assess cellular responses.

Main Results:

• Optogenetic activation of TLR4 led to sustained p65 and ERK1/2 phosphorylation.
• Light exposure enhanced cell attachment, invadopodia formation, and migration in 3D spheroid models.
• No significant changes in proliferation or viability were observed upon TLR4 activation.

Conclusions:

• The opto-TLR4 PANC-1 cell line provides a powerful tool for dissecting TLR4 molecular mechanisms.
• This system allows for precise temporal and spatial control of cellular signaling.
• Findings offer potential strategies for developing new therapeutic interventions for pancreatic cancer.