Cited by 172Neuroscience and Neuropharmacology ResearchMemory and Neural MechanismsNeurogenesis and neuroplasticity mechanisms

Dendritic spines disappear with chilling but proliferate excessively upon rewarming of mature hippocampus

Kirov, S.A, Petrak, L.J, Fiala, J.C, Harris, K.M·2004·Neuroscience

Abstract

More dendritic spine synapses occur on mature neurons in hippocampal slices by 2 h of incubation in vitro, than in perfusion-fixed hippocampus. What conditions initiate this spinogenesis and how rapidly do the spines begin to proliferate on mature neurons? To address these questions, CA1 field of the hippocampus neurons expressing green fluorescent protein in living slices from mature mice were imaged with two-photon microscopy. Spines disappeared and dendrites were varicose immediately after slice preparation in ice-cold artificial cerebrospinal fluid (ACSF). Electron microscopy (EM) revealed disrupted dendritic cytoplasm, enlarged or free-floating postsynaptic densities, and excessive axonal endocytosis. Upon warming dendritic varicosities shrank and spines rapidly reappeared within a few minutes illustrating the remarkable resilience of mature hippocampal neurons in slices. When membrane impermeant sucrose was substituted for NaCl in ACSF dendrites remained spiny at ice-cold temperatures and EM revealed less disruption. Nevertheless, spine number and length increased within 30 min in warm ACSF even when the extracellular calcium concentration was zero and synaptic transmission was blocked. When slices were first recovered for several hours and then chilled in 6 degrees C ACSF many spines disappeared and the dendrites became varicose. Upon re-warming varicosities shrank and spines reemerged in the same position from which they disappeared. In addition, new spines formed and…

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Crossref · 10.1016/j.neuroscience.2004.04.053

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Authors
Kirov, S. A., Petrak, L. J., Fiala, J. C., & Harris, K. M.
Affiliations
  • Augusta University (US)
  • Boston University (US)
Corresponding author
Kirov, S.A
Venue
Neuroscience
Publisher
Elsevier BV
Published
2004-01
Volume
127
Issue
1
Pages
69-80
ISSN
0306-4522 (ISSN-L)
OpenAlex
W2126033680
Cited by
172
References
56
Citations by year
2026: 2 · 2025: 5 · 2024: 5 · 2023: 3 · 2022: 3 · 2021: 4 · 2020: 5 · 2019: 3 · 2018: 2 · 2017: 7 · 2016: 7 · 2015: 7 · 2014: 12 · 2013: 6 · 2012: 12
FWCI
5.63
Type
journal article
Language
en
Open access
closed
Locations
  • Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute of Mental Health (K01 MH 02000, K01MH002000)
  • National Institute of Neurological Disorders and Stroke (R01NS033574, NS21184, NS33574)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
Keywords
dendritic spines, spine plasticity, spinogenesis, CA1 pyramidal neurons, rewarming, dendritic varicosities, postsynaptic density, sucrose replacement, neuronal recovery, ion homeostasis, two-photon imaging
MeSH terms
Animals, Calcium, Cerebrospinal Fluid, Cold Temperature, Dendrites, Hippocampus, Homeostasis, Male, Mice, Transgenic, Microscopy, Electron, Synaptic Transmission, Neuronal Plasticity, Sucrose, Synapses, Synaptic Membranes, Temperature, Water-Electrolyte Balance, Cell Size, Mice

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