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The Activating Receptors of Natural Killer Cells and Their Inter-Switching Potentials
Adekunle Babajide Rowaiye1, Titilayo Asala1, Angus Nnamdi Oli2
1Department of Medical Biotechnology, National Biotechnology Development Agency, Abuja, Nigeria.
Abstract:
The global incidence of cancer is on the increase and researchers are prospecting for specific and non-selective therapies derived from the immune system. The killer activating receptors of NK cells are known to be involved in immunosurveillance against tumor and virally-infected cells. These receptors belong to two main categories, namely the immunoglobulin like and C-lectin like families. Though they have different signal pathways, all the killer activating receptors have similar effector functions which include direct cytotoxicity and the release of inflammatory cytokines such as IFN-gamma and TNF-alpha. To transduce signals that exceed the activation threshold for cytotoxicity, most of these receptors require synergistic effort. This review profiles 21 receptors: 13 immunoglobulin-like, 5 lectin-like, and 3 others. It critically explores their structural uniqueness, role in disease, respective transduction signal pathways and their status as current and prospective targets for cancer immunotherapy. While the native ligands of most of these receptors are known, much work is required to prospect for specific antibodies, peptides and multi-target small molecules with high binding affinities.
Insights
Killer activating receptors on NK cells are crucial for cancer immunosurveillance. This review details 21 receptors, their structures, and roles in cancer immunotherapy, highlighting targets for future drug development.
Area of Science:
- Immunology
- Cancer Biology
- Pharmacology
Background:
- Global cancer incidence is rising, necessitating novel immunotherapies.
- Natural Killer (NK) cell activating receptors are key in immunosurveillance against tumors and viral infections.
- These receptors, categorized into immunoglobulin-like and C-lectin-like families, mediate cytotoxicity and cytokine release.
Purpose of the Study:
- To review 21 killer activating receptors of NK cells.
- To explore their structural features, disease relevance, and signaling pathways.
- To assess their potential as targets for cancer immunotherapy.
Main Methods:
- Literature review of 21 NK cell activating receptors.
- Analysis of receptor structures, signal transduction, and effector functions.
- Evaluation of current and prospective roles in cancer immunotherapy.
Main Results:
- The review covers 13 immunoglobulin-like, 5 C-lectin-like, and 3 other activating receptors.
- Details are provided on their unique structures, signaling mechanisms, and involvement in disease.
- Native ligands for most receptors are known, but specific therapeutic agents require further development.
Conclusions:
- Killer activating receptors are vital targets for developing novel cancer immunotherapies.
- Understanding their structural and functional diversity is crucial for designing effective treatments.
- Further research is needed to develop high-affinity antibodies, peptides, and small molecules for therapeutic targeting.
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