Cited by 214Memory and Neural MechanismsNeuroscience and Neuropharmacology ResearchNeurogenesis and neuroplasticity mechanisms

Hypothalamic and other connections with dorsal CA2 area of the mouse hippocampus

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Cui, Zhenzhong, Gerfen, Charles R., Young, W. Scott·2013·Journal of Comparative Neurology

Abstract

The CA2 area is an important, although relatively unexplored, component of the hippocampus. We used various tracers to provide a comprehensive analysis of CA2 connections in C57BL/6J mice. Using various adeno-associated viruses that express fluorescent proteins, we found a vasopressinergic projection from the paraventricular nuclei of the hypothalamus (PVN) to the CA2 as well as a projection from pyramidal neurons of the CA2 to the supramammillary nuclei. These projections were confirmed by retrograde tracing. As expected, we observed CA2 afferent projections from neurons in ipsilateral entorhinal cortical layer II as well as from bilateral dorsal CA2 and CA3 using retrograde tracers. Additionally, we saw CA2 neuronal input from bilateral medial septal nuclei, vertical and horizontal limbs of the nucleus of diagonal band of Broca, supramammillary nuclei (SUM), and median raphe nucleus. Dorsal CA2 injections of adeno-associated virus expressing green fluorescent protein revealed axonal projections primarily to dorsal CA1, CA2, and CA3 bilaterally. No projection was detected to the entorhinal cortex from the dorsal CA2. These results are consistent with recent observations that the dorsal CA2 forms disynaptic connections with the entorhinal cortex to influence dynamic memory processing. Mouse dorsal CA2 neurons send bilateral projections to the medial and lateral septal nuclei, vertical and horizontal limbs of the diagonal band of Broca, and SUM. Novel connections from the PVN and to the SUM suggest important regulatory roles for CA2 in mediating social and emotional input for memory processing.

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  • Oxytocin and vasopressin-expressing cells in the paraventricular and supraoptic nuclei send projections to the hippocampus, with the highest fiber density seen in the CA2 region for vasopressin and CA2/CA3 regions for oxytocin projections.

    “OXT and AVPexpressing cells in PVN and SON send projections to the hippocampus, with the highest fiber density seen in the CA2 region for AVP and CA2/CA3 regions for OXT projections (97-100).”
  • The failure to observe vasopressinergic input to CA2 from the paraventricular nucleus may reflect an inability of the transsynaptic rabies tracing system to label peptidergic inputs.

    “we failed to observe vasopressinergic input to CA2 from the paraventricular nucleus of the hypothalamus13, which may reflect an inability of the transsynaptic rabies tracing system to label peptidergic inputs15.”

    From The hippocampal CA2 region is essential for social memory (2014) · cites this paper as [13]

  • The absence of observed CA2 output to the supramammillary nucleus suggests this output may represent an inhibitory projection from CA2, as only pyramidal neurons were labeled.

    “We also did not observe CA2 output to the supramammillary nucleus13, suggesting this output may represent an inhibitory projection from CA2 as we selectively labeled PNs.”

    From The hippocampal CA2 region is essential for social memory (2014) · cites this paper as [13]

  • The anatomical results generally support previous findings on CA2 connectivity.

    “These anatomical results generally support previous13,14 findings.”

    From The hippocampal CA2 region is essential for social memory (2014) · cites this paper as [13]

  • The large EPSPs previously evoked in CA2 pyramidal neurons by focal stimulation in CA1 stratum lacunosum may result from activation of entorhinal cortex layer II fibers that course through or near stratum lacunosum, rather than layer III axons.

    “Our present results, combined with recent results13,14 suggest that these synaptic responses recorded in CA2 PNs may result from activation of LII fibers that course through or near SLM in CA1.”

    From The hippocampal CA2 region is essential for social memory (2014) · cites this paper as [13]

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Research works printed but not linked: 4

  1. Andersen P 2007 The hippocampus book Oxford; New York Oxford University Press 37 110
  2. De Olmos J Beltramino CA Alheid G 2004 Amygdala and extendedamygdala of the rat: a cytoarchitectonical, fibroarchitechtonical, and chemoarchitectonical survery Paxinos G The Rat Nervous System 3 New Yorl Elsevier 509 603
  3. Lein ES Callaway EM Albright TD Gage FH 2005b Redefining the boundaries of the hippocampal CA2 subfield in the mouse using gene expression and 3-dimensional reconstruction J Comp Neurol 485 1 1 10 15776443
  4. Meldrum BS Corsellis JAN 1984 Epilepsy Adams JH Corsellis JAN Duchen LW Greenfield’s Neuropathology 4 New York John Wiley & Sons 928 929

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Authors
Cui, Z., Gerfen, C. R., & Young, W. S.
Affiliations
National Institutes of Health (US)
Venue
Journal of Comparative Neurology
Publisher
Wiley
Published
2013-04-04
Volume
521
Issue
8
Pages
1844-1866
ISSN
  • 0021-9967 (ISSN-L)
  • 1096-9861
OpenAlex
W1846418424
Cited by
214
References
101
Citations by year
2026: 16 · 2025: 15 · 2024: 13 · 2023: 18 · 2022: 21 · 2021: 16 · 2020: 16 · 2019: 16 · 2018: 20 · 2017: 13 · 2016: 22 · 2015: 11 · 2014: 11 · 2013: 6
FWCI
4.53
Type
journal article
Language
en
Open access
Locations
  • The Journal of Comparative Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Institute of Mental Health (Z01-MH-002498-23, ZIAMH002498, Z01MH002498, Z01-MH-002947-23)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
Keywords
hippocampus, hypothalamus, paraventricular nucleus, vasopressin, entorhinal cortex, medial septum, diagonal band of Broca, median raphe nucleus, retrograde tracing, memory processes
MeSH terms
Adenoviridae, Animals, Brain, Hypothalamus, Indoles, Functional Laterality, Male, Neural Pathways, Neurons, Stilbamidines, Gene Transfer Techniques, Entorhinal Cortex, Plant Lectins, Green Fluorescent Proteins, Mice, CA2 Region, Hippocampal

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