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Interleukin 1-alpha
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 2ILA, 2KKI, 2L5X
Identifiers
Aliases	IL1A, IL-1A, IL1, IL1-ALPHA, IL1F1, interleukin 1 alpha, IL-1 alpha, IL-1α
External IDs	OMIM: 147760; MGI: 96542; HomoloGene: 480; GeneCards: IL1A; OMA:IL1A - orthologs
Gene location (Human) Chr. Chromosome 2 (human) Band 2q14.1 Start 112,773,925 bp End 112,784,493 bp
Gene location (Mouse) Chr. Chromosome 2 (mouse) Band 2 F1|2 62.9 cM Start 129,141,530 bp End 129,151,892 bp
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in periodontal fiber oral cavity buccal mucosa cell mucosa of urinary bladder testicle gums right testis left testis gingival epithelium islet of Langerhans Top expressed in esophagus skin of back embryo epidermis cornea spermatocyte liver corneal stroma lip placenta More reference expression data BioGPS More reference expression data
Gene ontology Molecular function cytokine activity protein binding copper ion binding interleukin-1 receptor binding Cellular component cytosol extracellular region cytoplasm extracellular space Biological process cellular response to heat response to copper ion positive regulation of angiogenesis positive regulation of gene expression immune response connective tissue replacement involved in inflammatory response wound healing positive regulation of protein secretion extrinsic apoptotic signaling pathway in absence of ligand ectopic germ cell programmed cell death positive regulation of vascular endothelial growth factor production cell population proliferation inflammatory response negative regulation of extrinsic apoptotic signaling pathway in absence of ligand positive regulation of mitotic nuclear division positive regulation of cell division positive regulation of transcription by RNA polymerase II negative regulation of cell population proliferation apoptotic process positive regulation of interleukin-6 production positive regulation of neutrophil extravasation fever generation positive regulation of monocyte chemotactic protein-1 production regulation of signaling receptor activity cytokine-mediated signaling pathway interleukin-1-mediated signaling pathway Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 3552 16175 Ensembl ENSG00000115008 ENSMUSG00000027399 UniProt P01583 P01582 RefSeq (mRNA) NM_000575 NM_001371554 NM_010554 RefSeq (protein) NP_000566 NP_001358483 NP_034684 Location (UCSC) Chr 2: 112.77 – 112.78 Mb Chr 2: 129.14 – 129.15 Mb PubMed search
Wikidata
View/Edit Human View/Edit Mouse

Interleukin-1 alpha (IL-1 alpha) also known as hematopoietin 1 is a cytokine of the interleukin 1 family that in humans is encoded by the IL1A gene. In general, Interleukin 1 is responsible for the production of inflammation, as well as the promotion of fever and sepsis. IL-1α inhibitors are being developed to interrupt those processes and treat diseases.

IL-1α is produced mainly by activated macrophages, as well as neutrophils, epithelial cells, and endothelial cells. It possesses metabolic, physiological, haematopoietic activities, and plays one of the central roles in the regulation of the immune responses. It binds to the interleukin-1 receptor. It is on the pathway that activates tumor necrosis factor-alpha.

Discovery

Interleukin 1 was discovered by Gery in 1972. He named it lymphocyte-activating factor (LAF) because it was a lymphocyte mitogen. It was not until 1985 that interleukin 1 was discovered to consist of two distinct proteins, now called interleukin-1 alpha and interleukin-1 beta.

Alternative names

IL-1α is also known as fibroblast-activating factor (FAF), lymphocyte-activating factor (LAF), B-cell-activating factor (BAF), leukocyte endogenous mediator (LEM), epidermal cell-derived thymocyte-activating factor (ETAF), serum amyloid A inducer or hepatocyte-stimulating factor (HSP), catabolin, hemopoetin-1 (H-1), endogenous pyrogen (EP), and proteolysis-inducing factor (PIF).

Synthesis and structure

IL-1α is a unique member in the cytokine family in the sense that the structure of its initially synthesized precursor does not contain a signal peptide fragment (same is known for IL-1β and IL-18). After processing by the removal of N-terminal amino acids by specific proteases, the resulting peptide is called "mature" form. Calpain, a calcium-activated cysteine protease, associated with the plasma membrane, is primarily responsible for the cleavage of the IL-1α precursor into a mature molecule. Both the 31kDa precursor form of IL-1α and its 18kDa mature form are biologically active.

The 31 kDa IL-1α precursor is synthesized in association with cytoskeletal structures (microtubules), unlike most secreted proteins, which are translated on ribosomes associated with rough endoplasmic reticulum.

The three-dimensional structure of the IL-1α contains an open-ended barrel composed entirely of beta-pleated strands. Crystal structure analysis of the mature form of IL-1α shows that it has two sites of binding to IL-1 receptor. There is a primary binding site located at the open top of its barrel, which is similar but not identical to that of IL-1β.

Production and cellular sources

IL-1α is constitutively produced by epithelial cells. It is found in substantial amounts in normal human epidermis and is distributed in a 1:1 ratio between living epidermal cells and stratum corneum. The constitutive production of large amounts of IL-1α precursor by healthy epidermal keratinocytes interfere with the important role of IL-1α in immune responses, assuming skin as a barrier, which prevents the entry of pathogenic microorganisms into the body.

The essential role of IL-1α in maintenance of skin barrier function, especially with increasing age, is an additional explanation of IL-1α constitutive production in epidermis.

With the exception of skin keratinocytes, some epithelial cells and certain cells in central nervous system, the mRNA coding for IL-1α (and, thus, IL-1α itself) is not observed in health in most of cell types, tissues, and blood, in spite of wide physiological, metabolic, haematopoietic, and immunological IL-1α activities.

A wide variety of other cells only upon stimulation can be induced to transcribe the IL-1α genes and produce the precursor form of IL-1α, Among them are fibroblasts, macrophages, granulocytes, eosinophils, mast cells and basophils, endothelial cells, platelets, monocytes and myeloid cell lines, blood T-lymphocytes and B-lymphocytes, astrocytes, kidney mesangial cells, Langerhans cells, dermal dendritic cells, natural killer cells, large granular lymphocytes, microglia, blood neutrophils, lymph node cells, maternal placental cells and several other cell types.

IL1A is found on the surface of senescent cells, where it contributes to the production of senescence-associated secretory phenotype (SASP) factors.

These data suggest that IL-1α is normally an epidermal cytokine.

Interactions

IL1A has been shown to interact with HAX1, and NDN.

Although there are many interactions of IL-1α with other cytokines, the most consistent and most clinically relevant is its synergism with TNF. IL-1α and TNF are both acute-phase cytokines that act to promote fever and inflammation. There are, in fact, few examples in which the synergism between IL-1α and TNFα has not been demonstrated. These include radioprotection, the Shwartzman reaction, PGE2 synthesis, sickness behavior, nitric oxide production, nerve growth factor synthesis, insulin resistance, loss of mean body mass, and IL-8 and chemokine synthesis.

Translation of mRNA for IL1A is highly dependent upon mTOR activity. IL1A and NF-κB mutually induce each other in a positive feedback loop.

Regulatory molecules

The most important regulatory molecule for IL-1α activity is IL-1Ra, which is usually produced in a 10- to 100-fold molar excess. In addition, the soluble form of the IL-1R type I has a high affinity for IL-1α and is produced in a 5-10 molar excess. IL-10 also inhibits IL-1α synthesis.

Biological activity

In vitro

IL-1α possesses biological effect on cells in the picomolar to femtomolar range. In particular, IL-1α:

• stimulates keratinocytes and macrophages for induced IL-1α secretion
• induces pro-collagen type I and III synthesis
• causes proliferation of fibroblasts, induces collagenase secretion, induces cytoskeletal rearrangements, induces IL-6 and GCSF secretion
• induces cycloxygenase synthesis and prostaglandin PGE2 release
• causes phosphorylation of heat shock protein
• causes proliferation of smooth muscle cells, keratinocytes and stimulates release of other cytokines by keratinocytes
• induces TNFα release by endothelial cells and Ca2+ release from osteoclasts.
• stimulates hepatocytes for secretion of acute-phase proteins
• induces proliferation of CD4+ cells, IL-2 production, co-stimulates CD8+/IL-1R+ cells, induces proliferation of mature B-cells and immunoglobulin secretion
• kills a limited number of tumor cells types

In vivo

Shortly after an onset of an infection into organism, IL-1α activates a set of immune system response processes. In particular, IL-1α:

• stimulates fibroblasts proliferation
• induces synthesis of proteases, subsequent muscle proteolysis, release of all types of amino acids in blood and stimulates acute-phase proteins synthesis
• changes the metallic ion content of blood plasma by increasing copper and decreasing zinc and iron concentration in blood
• induces production of SASP factors by senescent cells as a result of mTOR activity
• increases blood neutrophils
• activates lymphocyte proliferation and induces fever

Topically administered IL-1α also stimulates expression of FGF and EGF, and subsequent fibroblasts and keratinocytes proliferation. This, plus the presence of large depot of IL-1α precursor in keratinocytes, suggests that locally released IL-1α may play an important role and accelerate wound healing.

IL-1α is known to protect against lethal doses of γ-irradiation in mice, possibly as a result of hemopoietin-1 activity.

Applications

Pharmaceutical

Clinical trials on IL-1α have been carried out that are specifically designed to mimic the protective studies in animals. IL-1α has been administered to patients during receiving autologous bone marrow transplantation. The treatment with 50 ng/kg IL-1α from day zero of autologous bone marrow or stem cells transfer resulted in an earlier recovery of thrombocytopenia compared with historical controls. IL-1α is currently being evaluated in clinical trials as a potential therapeutic in oncology indications.

An anti-IL-1α therapeutic antibody, MABp1, is being tested in clinical trials for anti-neoplastic activity in solid tumors. Blocking the activity of IL-1α has the potential to treat skin diseases such as acne.

References

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Further reading

• Verweij CL, Bayley JP, Bakker A, Kaijzel EL (2002). "Allele specific regulation of cytokine genes: Monoallelic expression of the IL-lA gene". Allele specific regulation of cytokine genes: monoallelic expression of the IL-1A gene. Advances in Experimental Medicine and Biology. Vol. 495. pp. 129–39. doi:10.1007/978-1-4615-0685-0_17. ISBN 978-0-306-46656-4. PMID 11774556.
• Griffin WS, Mrak RE (August 2002). "Interleukin-1 in the genesis and progression of and risk for development of neuronal degeneration in Alzheimer's disease". Journal of Leukocyte Biology. 72 (2): 233–8. doi:10.1189/jlb.72.2.233. PMC 3835694. PMID 12149413.
• Arend WP (2003). "The balance between IL-1 and IL-1Ra in disease". Cytokine & Growth Factor Reviews. 13 (4–5): 323–40. doi:10.1016/S1359-6101(02)00020-5. PMID 12220547.
• Copeland KF (Dec 2005). "Modulation of HIV-1 transcription by cytokines and chemokines". Mini Reviews in Medicinal Chemistry. 5 (12): 1093–101. doi:10.2174/138955705774933383. PMID 16375755.
• Schmidt DR, Kao WJ (January 2007). "The interrelated role of fibronectin and interleukin-1 in biomaterial-modulated macrophage function". Biomaterials. 28 (3): 371–82. doi:10.1016/j.biomaterials.2006.08.041. PMID 16978691.
• Huynh-Ba G, Lang NP, Tonetti MS, Salvi GE (April 2007). "The association of the composite IL-1 genotype with periodontitis progression and/or treatment outcomes: a systematic review". Journal of Clinical Periodontology. 34 (4): 305–17. doi:10.1111/j.1600-051X.2007.01055.x. PMID 17378887.

External links

• IL1A+protein,+human at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

This article incorporates text from the United States National Library of Medicine, which is in the public domain.

• Genes on human chromosome 2
• Interleukins