Redefining nucleotide-binding oligomerization domain-like receptors: from immune sentinels to multifunctional...

Area of Science:

• Immunology
• Cell Biology
• Molecular Biology

Background:

• Nucleotide-binding oligomerization domain (NOD)-like receptors (NLRs) are key intracellular pattern recognition receptors in innate immunity.
• While canonical inflammasome NLRs (e.g., NLRP3, NLRC4) and microbial sensors (e.g., NOD1, NOD2) are well-studied, many NLR functions remain unclear.
• A significant portion of the NLR family's roles in biological processes beyond direct pathogen detection is not fully understood.

Purpose of the Study:

• To address the knowledge gap regarding the functions of less-characterized NLRs.
• To highlight the critical, context-dependent roles of NLRs beyond their traditional roles in pathogen sensing.
• To expand the understanding of NLR functions into new biological domains.

Main Methods:

• Literature review and synthesis of existing research on NLR family members.
• Classification of NLRs based on identified functional roles beyond pathogen sensing.
• Analysis of context-dependent NLR functions across various biological systems.

Main Results:

• NLRs function as critical immune modulators.
• Specific NLRs regulate essential cellular processes like autophagy and mitophagy.
• NLRs act as tissue-specific effectors and play roles in reproduction.

Conclusions:

• The functions of NLRs are diverse and highly context-dependent, extending far beyond classical inflammasome activation.
• Understanding these broader roles is crucial for comprehending complex cellular regulatory networks.
• Recognizing the expanded functions of NLRs opens new avenues for therapeutic strategies beyond traditional immunology.