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Updated: Jun 6, 2026

High-throughput Measurement of Dictyostelium discoideum Macropinocytosis by Flow Cytometry
Published on: September 10, 2018
PI3KC2α, a class II PI3K, is required for dynamin-independent internalization pathways
Claudia Krag1, Emily Kim Malmberg, Anna Elisabetta Salcini
1Biotech Research and Innovation Centre, BRIC, University of Copenhagen, Ole Maaløes Vej 5, DK2200 Copenhagen, Denmark.
Phosphoinositide 3-kinase C2α (PI3KC2α) regulates dynamin-independent endocytosis. This pathway is crucial for cellular uptake of molecules like diphtheria toxin (DT) and CD59, involving early endosome antigen 1 (EEA1) recruitment.
Area of Science:
- Cell Biology
- Molecular Biology
- Endocytosis Research
Background:
- Cellular uptake mechanisms independent of dynamin are not fully understood.
- Key regulators of dynamin-independent endocytosis and intracellular trafficking remain largely unknown.
Purpose of the Study:
- To identify molecular players regulating dynamin-independent endocytosis.
- To elucidate the role of phosphoinositide 3-kinases in these pathways.
Main Methods:
- Utilized a survival-based short-hairpin RNA screen with a diphtheria toxin receptor (DTR) cell line.
- Investigated the internalization of diphtheria toxin (DT) and other cargo molecules.
- Assessed the impact of PI3KC2α downregulation on endocytosis and protein relocalization.
Main Results:
- Identified PI3KC2α (phosphoinositide 3-kinase C2α) as a specific regulator of dynamin-independent DT internalization.
- Observed PI3KC2α relocalization to cargo-positive vesicles during dynamin-independent endocytosis.
- Downregulation of PI3KC2α impaired CD59 internalization and fluid-phase endocytosis.
Conclusions:
- PI3KC2α plays a general role in regulating dynamin-independent internalization pathways.
- PI3KC2α facilitates intracellular trafficking by recruiting early endosome antigen 1 (EEA1) to vesicular compartments.
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