Stable Expression and Characterization of an Optimized Mannose Receptor

Area of Science:

• Immunology
• Cell Biology
• Molecular Biology

Background:

• The mannose receptor (MR) is crucial for innate immunity, recognizing diverse pathogens.
• Studying MR function is challenging due to limited human cell line expression and unstable current models.
• Existing plasmid-based MR expression systems yield unstable proteins lacking critical domains.

Purpose of the Study:

• To develop and characterize a novel, human codon-optimized system for stable and functional MR expression.
• To improve mRNA quality and quantity for enhanced MR protein production.
• To validate the functional capacity of the optimized MR system in cellular assays.

Main Methods:

• Human codon optimization of MR gene sequences to enhance mRNA stability and translation.
• Generation of transient and stable MR expression systems using optimized plasmids.
• Confocal microscopy to assess receptor localization.
• Functional assays involving MR-mediated phagocytosis of *S. aureus* in HeLa cells.

Main Results:

• The codon-optimized system produced qualitatively and quantitatively improved MR mRNA.
• Optimized MR demonstrated correct cellular distribution via confocal imaging.
• HeLa cells transfected with the optimized MR plasmid exhibited MR-associated phagocytosis of *S. aureus*.
• MR colocalized with Toll-like receptor 2 (TLR2) and Rab5 during *S. aureus* internalization.

Conclusions:

• A novel, transfection-capable, codon-optimized MR expression system has been successfully developed.
• The optimized MR system exhibits functional characteristics comparable to the wild-type receptor.
• This system provides a robust platform for advancing the study of MR biology and function.