Bilateral serotonergic projections to the dorsal hippocampus of the rat

Simultaneous localizaton of 3H-5HT and HRP after retrograde transport

Research output: Contribution to journalArticle

Abstract

Horseradish peroxidase (HRP, Sigma VI, 30-70 nl of a 10-15% solution in saline or 3H-5HT (30 Ci/mmole, 2.5 x 10-3 M containing 3.3 x 10-3 M norepinephrine in saline, 50-100 nl) was injected unilaterally into the dorsal hippocampus in separate groups of rats. HRP-labeled cells were seen in the hippocampus, medial septal nucleus, nucleus of the diagonal band, supramammillary nucleus, median raphe nucleus, interfascicular portion of the dorsal raphe nucleus, and the locus coeruleus. In contrast, 3H-5HT-labeled cells were largely restricted to the raphe nuclei. In this nucleus an equal number of ipsilateral and bilateral cells were found. Occasionally, these labeled cells stretched across the midline (bridge pattern). In another series, the 3H-5HT and HRP were injected into the same hippocampus either as a mixture or sequentially. This resulted in double labeling of the median and dorsal raphe neurons. A final group of rats received injections of 3H-5HT and HRP into opposing hippocampi. Double-labeled cells accounted for 10% of the neurons labeled. In addition, closely paired neurons composed of an HRP- and 3H-5HT-containing cell were found. In summary, the serotoninergic fibers may play a key role in harmonizing the electrical activity of the hippocampi by use of bilateral projections, paired neurons with differential projections, and bridging neurons stretching across the midline but with unilateral projections.

Original languageEnglish (US)
Pages (from-to)737-743
Number of pages7
JournalJournal of Comparative Neurology
Volume203
Issue number4
StatePublished - 1981

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Hippocampus
Neurons
Septal Nuclei
Raphe Nuclei
Posterior Hypothalamus
Locus Coeruleus
Horseradish Peroxidase
Sodium Chloride
Norepinephrine
Injections
Dorsal Raphe Nucleus

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

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title = "Bilateral serotonergic projections to the dorsal hippocampus of the rat: Simultaneous localizaton of 3H-5HT and HRP after retrograde transport",
abstract = "Horseradish peroxidase (HRP, Sigma VI, 30-70 nl of a 10-15{\%} solution in saline or 3H-5HT (30 Ci/mmole, 2.5 x 10-3 M containing 3.3 x 10-3 M norepinephrine in saline, 50-100 nl) was injected unilaterally into the dorsal hippocampus in separate groups of rats. HRP-labeled cells were seen in the hippocampus, medial septal nucleus, nucleus of the diagonal band, supramammillary nucleus, median raphe nucleus, interfascicular portion of the dorsal raphe nucleus, and the locus coeruleus. In contrast, 3H-5HT-labeled cells were largely restricted to the raphe nuclei. In this nucleus an equal number of ipsilateral and bilateral cells were found. Occasionally, these labeled cells stretched across the midline (bridge pattern). In another series, the 3H-5HT and HRP were injected into the same hippocampus either as a mixture or sequentially. This resulted in double labeling of the median and dorsal raphe neurons. A final group of rats received injections of 3H-5HT and HRP into opposing hippocampi. Double-labeled cells accounted for 10{\%} of the neurons labeled. In addition, closely paired neurons composed of an HRP- and 3H-5HT-containing cell were found. In summary, the serotoninergic fibers may play a key role in harmonizing the electrical activity of the hippocampi by use of bilateral projections, paired neurons with differential projections, and bridging neurons stretching across the midline but with unilateral projections.",
author = "Efrain Azmitia",
year = "1981",
language = "English (US)",
volume = "203",
pages = "737--743",
journal = "Journal of Comparative Neurology",
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T1 - Bilateral serotonergic projections to the dorsal hippocampus of the rat

T2 - Simultaneous localizaton of 3H-5HT and HRP after retrograde transport

AU - Azmitia, Efrain

PY - 1981

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N2 - Horseradish peroxidase (HRP, Sigma VI, 30-70 nl of a 10-15% solution in saline or 3H-5HT (30 Ci/mmole, 2.5 x 10-3 M containing 3.3 x 10-3 M norepinephrine in saline, 50-100 nl) was injected unilaterally into the dorsal hippocampus in separate groups of rats. HRP-labeled cells were seen in the hippocampus, medial septal nucleus, nucleus of the diagonal band, supramammillary nucleus, median raphe nucleus, interfascicular portion of the dorsal raphe nucleus, and the locus coeruleus. In contrast, 3H-5HT-labeled cells were largely restricted to the raphe nuclei. In this nucleus an equal number of ipsilateral and bilateral cells were found. Occasionally, these labeled cells stretched across the midline (bridge pattern). In another series, the 3H-5HT and HRP were injected into the same hippocampus either as a mixture or sequentially. This resulted in double labeling of the median and dorsal raphe neurons. A final group of rats received injections of 3H-5HT and HRP into opposing hippocampi. Double-labeled cells accounted for 10% of the neurons labeled. In addition, closely paired neurons composed of an HRP- and 3H-5HT-containing cell were found. In summary, the serotoninergic fibers may play a key role in harmonizing the electrical activity of the hippocampi by use of bilateral projections, paired neurons with differential projections, and bridging neurons stretching across the midline but with unilateral projections.

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