Which pattern recognition receptors are important in detecting oral biofilm components in epithelial cells?

Which pattern recognition receptors are important in detecting oral biofilm components in epithelial cells?

• A. NOD-like receptors and G protein-coupled receptors contribute to detection.
• B. Toll-like receptors (TLRs) and NOD-like receptors contribute to detection.
• C. Nuclear receptors detect microbial components.
• D. Ion channels detect microbial components.

Answer: (B)

Detecting oral biofilm components in epithelial cells relies on pattern recognition receptors that sense conserved microbial structures. Toll-like receptors on the cell surface and in endosomes recognize a range of bacterial components such as LPS, lipoproteins, flagellin, and unmethylated CpG DNA, activating signaling pathways (often via MyD88 or TRIF) that lead to inflammatory mediator production. NOD-like receptors sense intracellular bacterial fragments, like peptidoglycan motifs, and recruit RIP2 to drive NF-κB and MAP kinase signaling, further boosting the inflammatory response. Together, these two receptor families provide the main detection system for oral biofilm components. Nuclear receptors and ion channels are not the primary detectors of microbial PAMPs in this context, and while GPCRs can modulate signaling, they do not serve as the principal pattern recognition receptors for biofilm components.