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"Alternative Medicine" Article "Alternativ medicin" artikel
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TLR9 - Cluster of Differentiation 289 TLR9 - Cluster af Differentiering 289

By Expert Author: Stephen Jones Ved ekspert Forfatter: Stephen Jones
View Summary | Submitted: 2008-07-11 | Word Count: 567 words | Views: 159 view(s) Vis Resumé | Forelagt: 2008-07-11 | Ordoptælling: 567 ord | Views: 159 se (s)
Stephen Jones
Toll-like receptor 9 (TLR9) often known as CD289 (cluster of differentiation 289), is a member of the Toll-like receptor family that recognizes pathogen-associated molecular pattern. Toll-lignende receptor 9 (TLR9) ofte kendt som CD289 (klynge af differentiering 289), er medlem af Toll-lignende receptor familie, der genkender patogen-tilknyttede molekylære mønster. TLR9 was first cloned and identified as a receptor for unmethylated CpG-DNA as well as for bacterial DNA. TLR9 første gang blev klonede og identificeret som en receptor for unmethylated CPG-DNA såvel som for bakteriel DNA. It is essential not only for pro-inflammatory cytokine production and other inflammatory responses, but it also plays a role in the induction of T helper 1 (Th1) acquired immune response and in the proliferation of B cells. Det er vigtigt ikke kun for pro-inflammatoriske cytokin produktion og andre inflammatoriske reaktioner, men det spiller også en rolle i induktion af T-helper 1 (Th1) erhvervet immunrespons og i forbindelse med spredningen af B-celler. Like all other members of the TLR family, TLR9 is composed of an extracellular domain containing multiple leucine-rich repeats (LRRs), a transmembrane region, and a cytoplasmic tail containing the conserved TIR domain. Som alle andre medlemmer af TLR familie, TLR9 er sammensat af en ekstracellulære domæne indeholder flere leucin-rige gentager (LRRs), en transmembrane region, og en cytoplasmic hale indeholder de bevares TIR domæne. The TLR9 sequence encodes a 1032 aa protein containing 27 N-terminal LRRs with a calculated molecular weight of 116 kDa . Den TLR9 sekvens koder en 1032 aa protein indeholdende 27 N-terminal LRRs med en beregnet molekylevægt på 116 kDa. The gene for TLR9 has been mapped to human chromosome 3p21.3. Genet for TLR9 er blevet kortlagt for den menneskelige kromosom 3p21.3. TLR9 is most closely related to TLR7 and TLR8 with 36% and 35% overall amino acid sequence identity, respectively and thus along with TLR7 and TLR8 constitutes a new sub-family of the TLRs. TLR9 er meget tæt forbundet med TLR7 og TLR8 med 36% og 35% i alt aminosyresekvens identitet, henholdsvis og dermed sammen med TLR7 og TLR8 udgør en ny sub-familien af TLRs.

In vivo, TLR9 mRNA is expressed in spleen, lymph node, bone marrow, and PBLs. In vivo, TLR9 mRNA er udtrykt i milt, lymfeknude, knoglemarv, og PBLs. (1) Specifically, TLR9 mRNA is expressed at the highest levels in B cells and dendritic cells (DC). (1) Konkret TLR9 mRNA er udtrykt på højeste niveau i B-celler og dendritic celler (DC). In vitro, TLR9 is moderately upregulated by autocrine IFN-γ, IL-1ß, IL-6, IL-10, and TNF-α in PMA-differentiated THP-1 cells. In vitro, TLR9 er moderat upregulated ved autocrine IFN-γ, IL-1ß, IL-6, IL-10, og TNF-α i PMA-opdelte THP-1 celler. TLR9 mRNA expression in THP-1 cells is unaffected by exposure to both Gram-positive and Gram-negative bacteria. TLR9 mRNA udtryk i THP-1 celler er upåvirket af eksponering for både Gram-positive og Gram-negative bakterier. Ex vivo, TLR9 expression in monocytes and particularly in granulocytes is downregulated in response to Gram-negative bacteria. Ex vivo, TLR9 udtryk i monocytter og især i granulocytter er downregulated som svar på Gram-negative bakterier. (2, 3) TLR9 also appears to be localized internally, perhaps in lysosomic or endocytic compartments where it would more likely encounter PAMPs including unmethylated DNA. (2, 3) TLR9 også synes at være lokaliseret internt, måske i lysosomic eller endocytic rum, hvor det vil mere sandsynligt støder PAMPs herunder unmethylated DNA.

TLR9 is expressed primarily on antigen presenting cells such as B cells and DC. TLR9 udtrykkes primært på antigen præsentere celler som B-celler og DC. In human DC, TLR9 is restricted to a subset of DC, plasmacytoid DC, responsible for production of high levels of type I IFN (IFNalpha). I human DC, TLR9 er begrænset til en delmængde af DC, plasmacytoid DC, der er ansvarlig for produktion af høje niveauer af type I IFN (IFNalpha). TLR9 recognizes synthetic CpG oligonucleotides and unmethylated CpG motifs in bacterial and viral DNA. TLR9 genkender syntetiske CPG oligonucleotides og unmethylated CPG motiver i bakterielle og virale DNA. Phagocytes endocytose microorganisms and lyse them in phagolysosomes, where their DNA is released and presumably interacts with TLR9, initiating an inflammatory response resulting in rapid secretion of a large quantity of IFNα and the production of inflammatory cytokines.(4) Two signaling pathways of TLR9 are thought to induce inflammatory cytokine expression: the MyD88-TRAF6-IRF5 pathway and the MyD88-TRAF6-TAK1-MAPK/IKK-AP-1/NF-κB pathway. Phagocytes endocytose mikroorganismer og lyseres dem i phagolysosomes, hvor deres DNA er frigivet og formentlig interagerer med TLR9, indleder en inflammatorisk reaktion resulterer i en hurtig sekretion af en stor mængde IFNα og produktion af inflammatoriske cytokiner. (4) To signalveje der af TLR9 er menes at inducere inflammatoriske cytokin udtryk: MyD88-TRAF6-IRF5 pathway og MyD88-TRAF6-TAK1-MAPK/IKK-AP-1/NF-κB pathway. Further TLR9 induce IFNα expression by activating IRF7 via TNF receptor-associated factor 3. Yderligere TLR9 inducere IFNα udtryk ved at aktivere IRF7 via TNF-receptor-associerede faktor 3. The cytosolic TIR domain of TLR9 recruits the adaptor molecule MyD88 and other signaling molecules such as IRAK-4, and TRAF6 that are required for the signaling complex. Den cytosolisk TIR domæne af TLR9 rekrutter adapter molekyle MyD88 og andre signaling molekyler såsom IRAK-4, og TRAF6, der er nødvendige for signalering kompleks. The transcription factors such as IRF-1, IRF-5, and IRF-7 are also recruited to the complex and activated. Omskrivning faktorer såsom Tilbageholdt-1, Tilbageholdt-5, og Tilbageholdt-7 er også rekrutteret til den komplekse og aktiveres. The complex in turn activates other signaling cascades that lead to the activation of NF-κB and AP-1. Den sammensatte igen aktiverer andre signaling kaskader, der fører til aktivering af NF-κB og AP-1. These activated transcription factors induce diverse immunity-related genes (5). Disse aktiveres transkription faktorer fremkalde forskellige immunitet-relaterede gener (5).

TLR9 signaling is recently implicated in the pathogenesis of autoimmunity, especially in systemic lupus erythematosus (SLE). TLR9 signaling er for nylig impliceret i patogenesen af autoimmunity, især i systemisk lupus erythematosus (SLE). TLR9 can suppress the pathology of autoimmunity in certain cases, although it may also act as a trigger and a center for a feedback loop of autoimmunity. TLR9 kan undertrykke patologi autoimmunity i visse tilfælde, selv om det også kan fungere som en udløsende faktor og et center for en feedback-sløjfe af autoimmunity.

Reference: 1. Reference: 1. Chuang, TH and RJ Ulevitch (2000) Eur. Chuang, TH og RJ Ulevitch (2000) Eur. Cytokine Netw. Cytokine netværk. 11:372.
2. Zarember, KA and PJ Godowski (2002) J. Immunol. Zarember, KA og PJ Godowski (2002) J. Immunol. 168:554.
3. Hornung, V. et al. Hornung, V. et al. (2002) J. Immunol. (2002) J. Immunol. 168:4531.
4. Cynthia A. Leifer The Journal of Immunology, 2004, 173: 1179-1183. Cynthia A. Leifer Journal of Immunology, 2004, 173: 1179-1183.
5. Yutaro Kumagai doi:10.1016/j.addr.2007.12.004 Article in press 2008. Yutaro Kumagai DOI: 10.1016/j.addr.2007.12.004 artikel i pressen 2008.
About the Author/Author Bio Om Forfatter / Author Bio

IMGENEX India Pvt Ltd. the only biotech company in Orissa and one of its kinds in Eastern India. IMGENEX India Pvt Ltd den eneste biotekvirksomhed i Orissa og en af sin slags i det østlige Indien. IMGENEX India started in Oct as an outsourcing branch of IMGENEX Corporation , San Diego, USA. IMGENEX Indien begyndte i oktober som en outsourcing filial af IMGENEX Corporation, San Diego, USA. Find out more information about Toll-like receptors . Få mere information om Toll-lignende receptorer.

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