A possible homologue of the suprachiasmatic nucleus in the hypothalamus of lampreys ( Lampetra fluviatilis L.)

This study in lampreys ( Lampetra fluviatilis L.) is concerned with the phylogenetic age of the suprachiasmatic nucleus of the hypothalamus which in mammals receives input from the retinohypothalamic tract and acts as circadian pacemaker. Tracing experiments with the fluorescent dye DiI demonstrated...

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Bibliographic Details
Published in:Neuroscience letters 1996-10, Vol.217 (2), p.173-176
Main Authors: Weigle, Christoph, Wicht, Helmut, Korf, Horst-W.
Format: Article
Language:English
Subjects:
Agnatha. Pisces
Animals
Biological and medical sciences
Carbocyanines
Endogenous oscillator
Freshwater
Fundamental and applied biological sciences. Psychology
Hypothalamus
Hypothalamus - metabolism
Hypothalamus - physiology
Immunohistochemistry
Lampetra fluviatilis
Lamprey
Lampreys - physiology
Neural Pathways - metabolism
Neural Pathways - physiology
Neuropeptides
Neuropeptides - metabolism
Phylogeny
Retinohypothalamic projections
Serotonin - metabolism
Suprachiasmatic nucleus
Suprachiasmatic Nucleus - metabolism
Suprachiasmatic Nucleus - physiology
Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution
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Summary:This study in lampreys ( Lampetra fluviatilis L.) is concerned with the phylogenetic age of the suprachiasmatic nucleus of the hypothalamus which in mammals receives input from the retinohypothalamic tract and acts as circadian pacemaker. Tracing experiments with the fluorescent dye DiI demonstrated a retinohypothalamic projection in lampreys which terminates in a distinct area of the hypothalamus corresponding to the infrachiasmatic part of the nucleus of the postoptic commissure. Immunocytochemical investigations showed vasotocinergic neurons and a relatively high concentration of neuropeptide Y-, substance P- and serotonin-immunoreactive nerve fibers in this region. These hodological and immunocytochemical data suggest that the infrachiasmatic part of the nucleus of the postoptic commissure of lampreys might be homologous to the suprachiasmatic nucleus of other craniates.
ISSN:0304-3940
1872-7972
DOI:10.1016/0304-3940(96)13105-0