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Analysis of spine morphological plasticity in developing hippocampal pyramidal neurons
Author(s) -
Parnass Zev,
Tashiro Ayumu,
Yuste Rafael
Publication year - 2000
Publication title -
hippocampus
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.767
H-Index - 155
eISSN - 1098-1063
pISSN - 1050-9631
DOI - 10.1002/1098-1063(2000)10:5<561::aid-hipo6>3.0.co;2-x
Subject(s) - filopodia , dendritic filopodia , spine (molecular biology) , hippocampal formation , dendritic spine , neuroscience , biology , hippocampus , anatomy , actin , microbiology and biotechnology
Dendritic spines are targets of most excitatory inputs in the central nervous system (CNS) and are morphologically heterogeneous. Ultrastructural studies have traditionally classified spines into four major categories (filopodia, stubby, thin, and mushroom) based on their distinct morphologies. The recent discovery of rapid morphological plasticity of spines has raised the possibility that those categories, rather than being intrinsically different populations of spines, represent instead temporal snapshots of a single dynamic phenomenon. We examined this question with two‐photon time‐lapse imaging of developing hippocampal pyramidal neurons, transfected with E‐GFP in cultured slices. After blind scoring to morphologically classify spines into the four traditional groups, we analyzed the fate of populations of spines over a period of 2–4 h. We found considerable morphological conversions among all categories, although systematic trends were detected. While most stubbies and spines (defined for our analysis as the combination of thin and mushroom protrusions) retained their basic morphologies, most filopodia transformed into stubbies and spines, although they could also extend out of existing spines. Our results suggest that in developing hippocampal pyramidal neurons, traditional morphological distinctions are stable over short (<4 h) periods of time, but that at the same time, considerable mixing among these groups takes place. Hippocampus 2000;10:561–568. © 2000 Wiley‐Liss, Inc.