Cited by 185Neuroscience and Neuropharmacology ResearchNeural dynamics and brain functionNeurogenesis and neuroplasticity mechanisms

Mouse cortical inhibitory neuron type that coexpresses somatostatin and calretinin

Xu, Xiangmin, Roby, Keith D., Callaway, Edward M.·2006·The Journal of Comparative Neurology

Abstract

Mammalian cortex contains a diversity of inhibitory neuron types, each with distinct morphological, immunochemical, and/or physiological properties. In rat cortex, chemical markers distinguish at least four distinct and nonoverlapping neuron classes based on expression of parvalbumin (PV), somatostatin (SST), calretinin (CR), and cholecystokinin (CCK). It has generally been assumed that these classifications should also apply to other rodent species. In mouse cortex, however, we found significant colocalization of SST and CR in inhibitory neurons; about 30% of SST-positive cells contained CR, and about 33% of CR-positive cells contained SST across frontal, somatosensory (S1), and visual cortex (V1). The SST and CR colocalized cells were concentrated in layer 2/3. We further characterized morphological and physiological properties of the mouse cortical inhibitory neuron types that express SST by using "GIN" transgenic mice, in which GFP is expressed in a subset of SST inhibitory neurons (see Oliva et al. [2000] J Neurosci 20:3354-3368). Generally, both SST/CR+ cells and SST/CR- cells exhibited morphological features of Martinotti cells as described in rat cortex, and they also had similar accommodating spike-firing patterns. However, they differed significantly in quantitative comparisons of morphology and spike shapes. SST/CR+ cells had more horizontally extended dendritic fields and more primary process than did SST/CR- cells; and SST/CR- cells had narrower action potential widths and faster afterhyperpolarization than did SST/CR+ cells. Thus, our data show an important species difference in the chemical distinction of inhibitory neuron subtypes, and indicate that colocalization of CR in SST cells correlates with different morphological and physiological features.

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Crossref · 10.1002/cne.21101

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  • Further divergence in O-LM and Martinotti cell molecular profiles is evidenced by the frequent coexpression of CR with SST in Martinotti cells, a molecular signature that is absent from the hippocampus.

    “Further divergence in O-LM and Martinotti cell molecular profiles is evidenced by the frequent coexpression of CR with SST in Martinotti cells, a molecular signature that is absent from the hippocampus (203, 339, 1042, 1238).”

    From Hippocampal GABAergic Inhibitory Interneurons (2017) · cites this paper as [1238]

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Authors
Xu, X., Roby, K. D., & Callaway, E. M.
Affiliations
Salk Institute for Biological Studies (US)
Corresponding author
Callaway, Edward M.
Venue
The Journal of Comparative Neurology
Publisher
Wiley
Published
2006
Volume
499
Issue
1
Pages
144-160
ISSN
  • 0021-9967 (ISSN-L)
  • 1096-9861
OpenAlex
W2048740604
Cited by
185
References
24
Citations by year
2026: 1 · 2025: 3 · 2024: 3 · 2023: 6 · 2022: 6 · 2021: 9 · 2020: 10 · 2019: 16 · 2018: 10 · 2017: 2 · 2016: 18 · 2015: 10 · 2014: 13 · 2013: 13 · 2012: 7
FWCI
3.67
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Comparative Neurology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute of Mental Health (MH063912, R01MH063912)
  • National Eye Institute (EY-010742, R01EY010742)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
Keywords
cortical inhibitory neurons, somatostatin, calretinin, colocalization, mouse cortex, layer 2/3, Martinotti cells, dendritic morphology, afterhyperpolarization, parvalbumin, cholecystokinin, species differences
MeSH terms
Action Potentials, Animals, Animals, Newborn, Cell Count, Cerebral Cortex, Dose-Response Relationship, Radiation, Electric Stimulation, Fluorescent Antibody Technique, Mice, Inbred C57BL, Mice, Transgenic, Nerve Tissue Proteins, Neural Inhibition, Neurons, Somatostatin, Green Fluorescent Proteins, Mice, S100 Calcium Binding Protein G, Calbindin 2

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