Retinohypothalamic projections and immunocytochemical analysis of the suprachiasmatic region of the desert iguana Dipsosaurus dorsalis

Daniel Janik, Vincent M. Cassone, Gary E Pickard, Michael Menaker

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Two separate and distinct retinal projections to the hypothalamus in the iguanid lizard Dipsosaurus dorsalis were described using horseradish peroxidase and cobalt-filling techniques. Both of the projections were unilateral and completely crossed; one terminated in the supraoptic nucleus and the other in the suprachiasmatic nucleus. Immunocytochemical analysis showed that the supraoptic nucleus contained cell bodies and fibers that cross-react with antibodies raised against arginine vasopressin, while the suprachiasmatic nucleus contained arginine vasopressin-like immunoreactive fibers emanating from cells in the nearby paraventricular nucleus. The suprachasmatic nucleus contained a dense plexus of fibers that cross-reacted with neuropeptide-Y antibody. Antiserum against vasoactive intestinal polypeptide showed no reactivity in any part of the forebrain, while antiserum against serotonin showed sparse and uniform reactivity throughout the forebrain, including the suprachiasmatic nucleus. These results, together with other data, indicate that the suprachiasmatic nucleus of D. dorsalis is homologous to the suprachiasmatic nuclei of rodents, structures known to contain circadian pacemakers. We suggest that the suprachiasmatic nucleus may play a similar role in the circadian system of D. dorsalis.

Original languageEnglish (US)
Pages (from-to)399-406
Number of pages8
JournalCell & Tissue Research
Volume275
Issue number3
DOIs
StatePublished - Mar 1 1994

Fingerprint

Iguanas
Suprachiasmatic Nucleus
Arginine Vasopressin
Fibers
Immune Sera
Pacemakers
Supraoptic Nucleus
Antibodies
Neuropeptide Y
Vasoactive Intestinal Peptide
Horseradish Peroxidase
Prosencephalon
Cobalt
Serotonin
Cells
Lizards
Paraventricular Hypothalamic Nucleus
Hypothalamus
Rodentia

Keywords

  • Dipsosaurus dorsalis (Lacertilia)
  • Hypothalamus
  • Neuropeptide Y
  • Retinal projections
  • Suprachiasmatic nucleus
  • Vasotocin

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Histology
  • Cell Biology

Cite this

Retinohypothalamic projections and immunocytochemical analysis of the suprachiasmatic region of the desert iguana Dipsosaurus dorsalis. / Janik, Daniel; Cassone, Vincent M.; Pickard, Gary E; Menaker, Michael.

In: Cell & Tissue Research, Vol. 275, No. 3, 01.03.1994, p. 399-406.

Research output: Contribution to journalArticle

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