Interleucina 12: Diferenzas entre revisións

Contido eliminado Contido engadido
Miguelferig (conversa | contribucións)
Miguelferig (conversa | contribucións)
Liña 69:
A IL-12 únese ao receptor de IL-12, que é un receptor heterodimérico formado por '''IL-12R-β1''' e '''IL-12R-β2'''. O IL-12R-β2 consdérase que desempeña un papel clave na función da IL-12, xa que se encontra en células T activadas e é estimulado por citocinas que promoven o desenvolvemento de [[célula T colaboradora|células Th1]] e inhibido polos que promoven o desenvolvemento das [[célula T colaboradora|células Th2]]. Despois da unión, o IL-12R-β2 é [[fosforilación|fosforilado]] nunha [[tirosina]] e proporciona sitios de unión para as [[quinase]]s '''Tyk2''' e '''Jak2'''. Estas son importantes na activación de [[factor de transcrición|factores de transcrición]] proteicos fundamentais como [[STAT4]], que están implicados na sinalización de IL-12 na células T e NK. Esta vía denomínase [[vía JAK-STAT]].<ref>{{cite journal |author=Wang KS, Frank DA, Ritz J |title=Interleukin-2 enhances the response of natural killer cells to interleukin-12 through up-regulation of the interleukin-12 receptor and STAT4 |journal=Blood |volume=95 |issue=10 |pages=3183–90 |date=May 2000 |pmid=10807786 |url=http://bloodjournal.hematologylibrary.org/cgi/pmidlookup?view=long&pmid=10807786}}</ref>
 
== A IL-12 ande a autoimmunityautoinmunidade ==
 
A IL-12 está ligada coa [[autoinmunidade]]. A administración de IL-12 a persoas que padecen [[enfermidade autoinmune|enfermidades autoinmunes]] empeora o proceso autoinmune. Crese que isto se debe ao seu papel clave na indución das respostas inmnes Th1. En contraste, os [[knockout de xenes]] para IL-12 en ratos ou o tratamento dos ratos con [[anticorpo]]s específicos contra IL-12 causan unha mellora da doeenza.
IL-12 is linked with [[autoimmunity]]. Administration of IL-12 to people suffering from [[autoimmune disease]]s was shown to worsen the autoimmune phenomena. This is believed to be due to its key role in induction of Th1 immune responses. In contrast, IL-12 [[gene knock-out]] in mice or a treatment of mice with IL-12 specific antibodies ameliorated the disease.
 
theNun resultsestudo foundcon inratos micealérxicos areaos [[cacahuete]]s, comprobouse que carecían de IL-12, o que suxire que a molécula detén normalmente as profoundalerxias alimentarias. Estase agora a investigar se os resultados atopados en ratos son igual de intensos inen humanshumanos.<ref>{{cite journal |author=Temblay JN, Bertelli E, Arques JL, Regoli M, Nicoletti C |title=Production of IL-12 by Peyer patch-dendritic cells is critical for the resistance to food allergy |journal=J. Allergy Clin. Immunol. |volume=120 |issue=3 |pages=659–65 |date=September 2007 |pmid=17599398 |doi=10.1016/j.jaci.2007.04.044 |url=http://linkinghub.elsevier.com/retrieve/pii/S0091-6749(07)00942-6}}</ref><ref>{{cite news |title=Food allergy molecule discovered |newspaper=BBC News |date=1 July 2007 |url=http://news.bbc.co.uk/2/hi/health/6254576.stm}}</ref>
Results published in the Journal of Allergy and Clinical Immunology from a study where mice that were bred to be allergic to peanuts, Interleukin-12 has been shown to not be present, suggesting that the molecule normally stops allergies to food developing. Further investigation is underway, to determine whether
the results found in mice are as profound in humans.<ref>{{cite journal |author=Temblay JN, Bertelli E, Arques JL, Regoli M, Nicoletti C |title=Production of IL-12 by Peyer patch-dendritic cells is critical for the resistance to food allergy |journal=J. Allergy Clin. Immunol. |volume=120 |issue=3 |pages=659–65 |date=September 2007 |pmid=17599398 |doi=10.1016/j.jaci.2007.04.044 |url=http://linkinghub.elsevier.com/retrieve/pii/S0091-6749(07)00942-6}}</ref><ref>{{cite news |title=Food allergy molecule discovered |newspaper=BBC News |date=1 July 2007 |url=http://news.bbc.co.uk/2/hi/health/6254576.stm}}</ref>
 
== IL-12 and IL-12 receptor β1 mutations ==