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About: Internalin

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Internalins are surface proteins found on Listeria monocytogenes. They exist in two known forms, InlA and InlB. They are used by the bacteria to invade mammalian cells via cadherins transmembrane proteins and Met receptors respectively. The exact role of these proteins and their invasiveness in vivo is not completely understood. In cultured cells, InlA is necessary to facilitate Listeria entry into human epithelial cells, while InlB is necessary for Listeria internalisation in several other cell types, including hepatocytes, fibroblasts, and epithelioid cells. Internalins are mainly surface-exposed virulencefactors present in a number of Gram-positive bacteria whose role ranges from recognition of cellular receptors to aid in pathogen entry to escape from autophagy.

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  • Internalins are surface proteins found on Listeria monocytogenes. They exist in two known forms, InlA and InlB. They are used by the bacteria to invade mammalian cells via cadherins transmembrane proteins and Met receptors respectively. The exact role of these proteins and their invasiveness in vivo is not completely understood. In cultured cells, InlA is necessary to facilitate Listeria entry into human epithelial cells, while InlB is necessary for Listeria internalisation in several other cell types, including hepatocytes, fibroblasts, and epithelioid cells. Internalins are mainly surface-exposed virulencefactors present in a number of Gram-positive bacteria whose role ranges from recognition of cellular receptors to aid in pathogen entry to escape from autophagy. Listeria poses a particular threat to pregnant women because of its ability to cross the placental blood barrier through the combined binding of both InIA and InIB to host cells. Research has shown that only the combined binding of these two virulence factors allows the bacteria to cross that barrier. This is not the case in mice and guinea pigs whose cells only have affinity for InIB in mice and InIA in guinea pigs. InlB blocks the action of cytotoxic T-cells and extents the infected cell lifespan. (en)
  • インターナリン(Internalin)とは、リステリア・モノサイトゲネスの細胞表面から発見された表面タンパク質である。InlAとInlBの2種類が存在する。InlAおよびInlBは、それぞれカドヘリン膜貫通タンパク質およびMet受容体を経由して哺乳類細胞に侵入する細菌に利用される。インターナリンの正確な役割は正確には明らかになっていない。ただ培養細胞では、InlAはListeria属細菌がヒト上皮細胞に容易に侵入するのに必要であり、InlBは他の細胞(肝細胞、線維芽細胞、類上皮細胞など)への侵入に必要であることは分かっている。多くのグラム陽性細菌において、インターナリンは、病原菌が宿主のオートファジーを回避するための受容体認識に関わる。 Listeria属細菌は胎盤血の免疫障壁を突破することができ、妊婦に対する感染や胎児の死産・流産を引き起こす。この障壁突破にはInIAとInIBの両方が宿主細胞に結合することが必要である。ただし、InIBに対してのみ親和性を持つマウス、InIAにのみ親和性があるモルモットでは異なる。 (ja)
  • As internalinas são proteínas da superfície celular que se encontram na bactéria Listeria monocytogenes. As principais formas que se conhecem são: InlA, InlB, InlH e InlK. A bactéria utiliza-as para invadir células de mamíferos por meio das proteínas transmembranares caderinas (no caso de InlA) e os receptores Met (no caso de InlB). O papel exacto destas proteínas e a sua capacidade invasiva in vivo ainda não é totalmente compreendido. Em células em cultivo, InlA é necessária para facilitar a entrada de Listeria nas células epiteliais humanas, enquanto que a InlB é necessária para a internalização de Listeria em vários outros tipos de células, como os hepatócitos, fibroblastos e células epitelióides. As internalinas são essencialmente factores de virulência expostos na superfície bacteriana, cujo papel vai desde o reconhecimento de receptores celulares para ajudar à entrada do patógeno e escapar da autofagia.A Listeria monocytogenes pressupõe uma ameaça para as mulheres grávidas devido à sua capacidade de cruzar a sanguínea por meio da união à vez das InIA e InIB às células do hóspede. As investigações mostraram que só a união combinada destes dois factores de virulência permite que a bactéria cruze esta barreira. O mesmo não ocorre nos ratos e porquinhos-da-índia, cujas células só têm afinidade por InIB em ratos e por InIA nos porquinhos-das-índias. (pt)
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  • インターナリン(Internalin)とは、リステリア・モノサイトゲネスの細胞表面から発見された表面タンパク質である。InlAとInlBの2種類が存在する。InlAおよびInlBは、それぞれカドヘリン膜貫通タンパク質およびMet受容体を経由して哺乳類細胞に侵入する細菌に利用される。インターナリンの正確な役割は正確には明らかになっていない。ただ培養細胞では、InlAはListeria属細菌がヒト上皮細胞に容易に侵入するのに必要であり、InlBは他の細胞(肝細胞、線維芽細胞、類上皮細胞など)への侵入に必要であることは分かっている。多くのグラム陽性細菌において、インターナリンは、病原菌が宿主のオートファジーを回避するための受容体認識に関わる。 Listeria属細菌は胎盤血の免疫障壁を突破することができ、妊婦に対する感染や胎児の死産・流産を引き起こす。この障壁突破にはInIAとInIBの両方が宿主細胞に結合することが必要である。ただし、InIBに対してのみ親和性を持つマウス、InIAにのみ親和性があるモルモットでは異なる。 (ja)
  • Internalins are surface proteins found on Listeria monocytogenes. They exist in two known forms, InlA and InlB. They are used by the bacteria to invade mammalian cells via cadherins transmembrane proteins and Met receptors respectively. The exact role of these proteins and their invasiveness in vivo is not completely understood. In cultured cells, InlA is necessary to facilitate Listeria entry into human epithelial cells, while InlB is necessary for Listeria internalisation in several other cell types, including hepatocytes, fibroblasts, and epithelioid cells. Internalins are mainly surface-exposed virulencefactors present in a number of Gram-positive bacteria whose role ranges from recognition of cellular receptors to aid in pathogen entry to escape from autophagy. (en)
  • As internalinas são proteínas da superfície celular que se encontram na bactéria Listeria monocytogenes. As principais formas que se conhecem são: InlA, InlB, InlH e InlK. A bactéria utiliza-as para invadir células de mamíferos por meio das proteínas transmembranares caderinas (no caso de InlA) e os receptores Met (no caso de InlB). O papel exacto destas proteínas e a sua capacidade invasiva in vivo ainda não é totalmente compreendido. Em células em cultivo, InlA é necessária para facilitar a entrada de Listeria nas células epiteliais humanas, enquanto que a InlB é necessária para a internalização de Listeria em vários outros tipos de células, como os hepatócitos, fibroblastos e células epitelióides. As internalinas são essencialmente factores de virulência expostos na superfície bacterian (pt)
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  • Internalin (en)
  • インターナリン (ja)
  • Internalina (pt)
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