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Endocytose

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Endocytose (Endocytose)

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Cours n°2 Biologie Cellulaire

Endocytose
Il existe plusieurs types d’endocytose.

Défini3on : capture de molécules ou par6cules extracellulaires dans des vésicules ou vacuoles dérivées de la
membrane plasmique

L’endocytose médiée par récepteurs
- Vésicules recouvertes de clathrine

L’endocytose de phase-fluide (pinocytose)
- Vésicules lisses
- Cavéoles
- Macropinocytose

La phagocytose
- Grosses par6cules insolubles

Voir document prépara6on TP

1. Forma3on de la vésicule d’endocytose : le manteau de clathrine




Coté cytosolique on voit qu’il y a une invagina6on. On observe également du matériel biologique.
On observe des réseaux plats ou incurvés.


Les LDL qui transportent du cholestérol dans le sang ont des
récepteurs à la surface de la cellule.

On ne connait pas de régulateur pour l’endocytose.

AP-2 est cons6tué de 4 sous-unités, c’est l’adaptateur qui va
récupérer la clathrine.

• La matériel endocyté peut avoir des des3nés variées




Dés qu’on est dans l’endosome précoce le pH diminue.

Il y a des phénomènes de recyclages de matériel.




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