The cytosolic domain of APP induces the relocalization of dynamin 3 in hippocampal neurons.
Amyloid precursor protein (APP) has been the subject of intense research to uncover its implication in Alzheimer's disease. Its physiological function is, however, still poorly understood. Herein, we investigated its possible influence on the development of cultured hippocampal neurons. A peptide corresponding to the APP intracellular domain linked to a cell-penetrating peptide was used to alter the interactions of APP with its cytosolic partners. This treatment promoted the concentration of the cytosolic GTPase dynamin 3 (Dyn3) in neurite segments when most untreated cells displayed a homogenous punctate distribution of Dyn3. The Dyn3-labelled segments were excluded from those revealed by APP staining after aldehyde fixation. Interestingly, after aldehyde fixation MAP2 also labelled segments excluded from APP-stained segments. Thus APP is also a marker for the spacing pattern of neurites demonstrated by Taylor & Fallon (2006)J. Neurosci., 26, 1154-4463.
Meckler
X
X
Physiologie Cellulaire de la Synapse, UMR5091 CNRS, Université Victor Segalen Bordeaux 2, 146 rue Léo Saignat, 33077 Bordeaux Cedex, France.
Bertandeau
E
E
McNiven
M A
MA
Allinquant
B
B
Hémar
A
A
D016564:Amyloid beta-Protein Precursor / Q000378:metabolism*; D000818:Animals; D015153:Blotting, Western; D002478:Cells, Cultured; D003600:Cytosol / Q000378:metabolism*; D034281:Dynamins / Q000378:metabolism*; D006624:Hippocampus / Q000378:metabolism*; D007150:Immunohistochemistry; D009474:Neurons / Q000378:metabolism*; D051381:Rats
D016564:Amyloid beta-Protein Precursor; D034281:Dynamins