Il6 Interleukin 6 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
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| Attribute | Value |
|---|---|
| Gene Symbol | IL6 |
| Full Name | Interleukin-6 |
| Chromosomal Location | 7p15.3 |
| NCBI Gene ID | 3569 |
| Ensembl ID | ENSG00000136244 |
| UniProt ID | P05231 |
| OMIM | 147620 |
| Gene Family | IL-6 family cytokines |
| Protein Class | Cytokine, Interleukin |
The IL6 gene encodes Interleukin-6 (IL-6), a pleiotropic pro-inflammatory cytokine with critical roles in immune regulation, inflammation, hematopoiesis, and acute phase responses[1]. IL-6 is produced by various cell types including immune cells (macrophages, dendritic cells, B cells), glial cells (astrocytes, microglia), and neurons[2]. In the nervous system, IL-6 has both beneficial (neuroprotective, regenerative) and detrimental (chronic neuroinflammation, excitotoxicity) effects depending on context and timing[3]. Dysregulated IL-6 signaling is implicated in the pathogenesis of Alzheimer's disease, Parkinson's disease, multiple sclerosis, and other neurodegenerative disorders[4].
IL-6 signals through two distinct pathways:
| Pathway | Key Molecules | Biological Outcome |
|---|---|---|
| JAK/STAT3 | JAK1/2, STAT3, SOCS3 | Gene transcription, acute phase response |
| MAPK/ERK | Ras, Raf, MEK, ERK1/2 | Cell proliferation, differentiation |
| PI3K/Akt | PI3K, PDK, Akt | Cell survival, metabolism |
| NF-κB | IKK, IκB, p65/p50 | Pro-inflammatory gene expression |
| Activity | Mechanism | CNS Relevance |
|---|---|---|
| Acute Phase Response | Hepcidin, CRP induction | Systemic inflammation |
| B Cell Differentiation | Plasma cell formation | Autoantibody production |
| Hematopoiesis | Stem cell proliferation | Immune cell development |
| Neuronal Survival | STAT3 activation | Neuroprotection |
| Thermoregulation | Hypothalamic effects | Fever generation |
| Cell Type | Expression Level | Conditions |
|---|---|---|
| Astrocytes | Moderate | Injury, inflammation |
| Microglia | High | Chronic activation |
| Neurons | Low | Activity-dependent |
| Oligodendrocytes | Low | Demyelination |
| Endothelial Cells | Moderate | BBB inflammation |
IL-6 is a key mediator of chronic neuroinflammation in Alzheimer's disease[4]:
IL-6 contributes to dopaminergic neuron degeneration in PD[5]:
IL-6 plays a complex role in MS pathogenesis[6]:
| Drug | Target | Route | Indication |
|---|---|---|---|
| Tocilizumab | IL-6R | IV/SC | RA, Castleman's disease, CRS |
| Sarilumab | IL-6R | SC | Rheumatoid arthritis |
| Siltuximab | IL-6 | IV | Castleman's disease |
| Clazakizumab | IL-6 | SC | RA, PsA |
| Approach | Status | Challenges |
|---|---|---|
| IL-6R antibodies | Clinical trials | BBB penetration |
| JAK inhibitors | Preclinical | Broad immunosuppression |
| STAT3 inhibitors | Preclinical | CNS delivery |
| Gene therapy | Experimental | Targeting specificity |
[1] Kishimoto T. IL-6: from its discovery to clinical applications. Int J Mol Sci. 2020;21(7):2280. PMID:32224333
[2] Rothaug M, et al. IL-6 family of cytokines in the CNS. Adv Neurobiol. 2014;11:1-27. PMID:25207119
[3] Erta M, et al. IL-6, a pleiotropic cytokine. Front Cell Neurosci. 2012;6:44. PMID:23055952
[4] Quirié A, et al. Role of IL-6 in Alzheimer's disease. J Neurol Sci. 2012;322(1-2):96-105. PMID:22710117
[5] Ferrari CC, et al. IL-6 in Parkinson's disease. Neurodegener Dis. 2006;3(4-5):285-290. PMID:16954691
[6] Lock C, et al. IL-6 in multiple sclerosis. J Immunol. 2002;169(6):3434-3441. PMID:12218176
The study of Il6 Interleukin 6 has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
[1] Kishimoto T. IL-6: from its discovery to clinical applications. International Journal of Molecular Sciences. 2020;21(7):2280. PMID:32224333
[2] Rothaug M, et al. IL-6 family of cytokines in the central nervous system. Advances in Neurobiology. 2014;11:1-27. PMID:25207119
[3] Erta M, et al. IL-6, a pleiotropic cytokine. Frontiers in Cellular Neuroscience. 2012;6:44. PMID:23055952
[4] Quirié A, et al. Role of IL-6 in Alzheimer's disease. Journal of the Neurological Sciences. 2012;322(1-2):96-105. PMID:22710117
[5] Ferrari CC, et al. Interleukin-6 in Parkinson's disease. Neurodegenerative Diseases. 2006;3(4-5):285-290. PMID:16954691
[6] Lock C, et al. Humanized mice are resistant to IL-6 in multiple sclerosis. Journal of Immunology. 2002;169(6):3434-3441. PMID:12218176