Trombospondina 1: Diferenzas entre revisións

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Miguelferig (conversa | contribucións)
Miguelferig (conversa | contribucións)
Liña 101:
 
A proteína trombospondina 1 é un dos membros da familia das [[trombospondina]]s. É unha glicoproteína de matriz multidominio que é un inhibidor natural da [[neovascularización]] e a [[tumoroxénese]] en tecidos sans. A esta proteína atribuíuselle unha modulación positiva e negativa da adhesión das [[célula endotelial|células endoteliais]], motilidade e crecemento, o cal non debería ser sorprendente tendo en conta que interacciona con polo menos 12 receptores de adhesión celular, como o [[CD36]], as [[integrina]]s αv e β1, o [[sindecano]] e a proteína asociada á integrina (IAP ou [[CD47]]). Tamén interacciona con numerosas [[protease]]s implicadas na [[anxioxénese]], como o [[plasminóxeno]], [[uroquinase]], [[metaloproteinase de matriz]], [[trombina]], [[catepsina]] e [[elastase]].
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Thrombospondin-1 binds to the [[reelin]] receptors, [[ApoER2]] and [[VLDLR]], thereby affecting neuronal migration in the [[rostral migratory stream]].<ref name="pmid18946489">{{cite journal | vauthors = Blake SM, Strasser V, Andrade N, Duit S, Hofbauer R, Schneider WJ, Nimpf J | title = Thrombospondin-1 binds to ApoER2 and VLDL receptor and functions in postnatal neuronal migration | journal = The EMBO Journal | volume = 27 | issue = 22 | pages = 3069–80 | date = Nov 2008 | pmid = 18946489 | pmc = 2585172 | doi = 10.1038/emboj.2008.223 }}</ref>
 
TheA varioustrombospondina functions1 ofúnese theaos TSRsreceptores havede been[[reelina]], attributed[[ApoER2]] toe several recognition motifs. Characterization of these motifs has led to the use of recombinant proteins that contain these motifs; these recombinant proteins are deemed useful in cancer therapy. The TSP-1[[VLDLR]], 3TSRafectando (a recombinantmigración versionneuronal ofna the[[corrente THBS1migratoria antiangiogenic domain containing all three thrombosopondin-1 type 1 repeats) can activate transforming growth factor beta 1 (TGFβ1) and inhibit endothelial cell migration, angiogenesis, and tumor growthrostral]].<ref name="pmid22509329pmid18946489">{{cite journal | vauthors = Lopez-DeeBlake ZPSM, ChitturStrasser SVV, PatelAndrade BN, StantonDuit RS, WakeleyHofbauer MR, LippertSchneider BWJ, MenakerNimpf A, Eiche B, Terry R, Gutierrez LSJ | title = Thrombospondin-1 typebinds 1to repeatsApoER2 inand aVLDL modelreceptor ofand inflammatoryfunctions bowelin disease:postnatal transcriptneuronal profile and therapeutic effectsmigration | journal = PLoSThe EMBO OneJournal | volume = 727 | issue = 422 | pages = e345903069–80 | yeardate = 2012Nov 2008 | pmid = 2250932918946489 | pmc = 33180032585172 | doi = 10.13711038/journalemboj.pone2008.0034590223 }}</ref>
 
As diversas funcións das TSR foron atribuídas a varios motivos de recoñecemento. A caracterización destes motivos levou ao uso de proteínas rfecombinantes que conteñen estes motivos; estas proteínas recombinantes considéranse útiles na terapia do cancro. A TSP-1 3TSR (unha versión recombinante do dominio antianxioxénico THBS1 contén os tres dominios de repeticións de trombosopondina 1 tipo 1) pode activar o [[factor de crecemento transformante beta 1]] (TGFβ1) e inhibe a migración de células endoteliais, a anxioxénese e o crecemento tumoral.<ref name="pmid22509329">{{cite journal | vauthors = Lopez-Dee ZP, Chittur SV, Patel B, Stanton R, Wakeley M, Lippert B, Menaker A, Eiche B, Terry R, Gutierrez LS | title = Thrombospondin-1 type 1 repeats in a model of inflammatory bowel disease: transcript profile and therapeutic effects | journal = PLoS One | volume = 7 | issue = 4 | pages = e34590 | year = 2012 | pmid = 22509329 | pmc = 3318003 | doi = 10.1371/journal.pone.0034590 }}</ref>
== Estrutura ==
 
== Estrutura ==
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Thrombospondin's activity has been mapped to several domains, in particular the [[amino-terminal]] heparin-binding domain, the procollagen domain, the properdin-like type I repeats, and the globular [[carboxy-terminal]] domain. The protein also contains type II repeats with epidermal growth factor-like homology and type III repeats that contain an [[RGD motif|RGD]] sequence.<ref name="pmid17160353">{{cite journal | vauthors = Forslöw A, Liu Z, Sundqvist KG | title = Receptor communication within the lymphocyte plasma membrane: a role for the thrombospondin family of matricellular proteins | journal = Cellular and Molecular Life Sciences | volume = 64 | issue = 1 | pages = 66–76 | date = Jan 2007 | pmid = 17160353 | doi = 10.1007/s00018-006-6255-8 }}</ref>