Molecular neuroanatomy and chemoarchitecture of the neurosecretory preoptic-hypothalamic area in zebrafish larvae

Herget, U., Wolf, A., Wullimann, M.F., and Ryu, S.
The Journal of comparative neurology   522(7): 1542-64 (Journal)
Registered Authors
Herget, Ulrich, Ryu, Soojin, Wullimann, Mario F.
neuroendocrine system, hypothalamus, preoptic region, paraventricular nucleus, zebrafish, neurosecretory preoptic area
MeSH Terms
  • Amino Acid Sequence
  • Animals
  • Female
  • Imaging, Three-Dimensional
  • Immunohistochemistry
  • In Situ Hybridization
  • Larva/anatomy & histology*
  • Larva/metabolism*
  • Microscopy, Confocal
  • Neuropeptides/genetics
  • Neuropeptides/metabolism
  • Neurosecretory Systems/anatomy & histology
  • Neurosecretory Systems/growth & development
  • Neurosecretory Systems/metabolism*
  • Preoptic Area/anatomy & histology
  • Preoptic Area/growth & development
  • Preoptic Area/metabolism*
  • Species Specificity
  • Transcription Factors/genetics
  • Transcription Factors/metabolism
  • Zebrafish/anatomy & histology
  • Zebrafish/growth & development
  • Zebrafish/metabolism*
  • Zebrafish Proteins/genetics
  • Zebrafish Proteins/metabolism
24127437 Full text @ J. Comp. Neurol.

The paraventricular nucleus (PVN) in mammals is the main hypothalamic nucleus controlling hormone release in the pituitary and plays pivotal roles in homeostasis. While the location of a PVN-homologous region has been described in adult fish as the neurosecretory preoptic area (NPO), this region has not been clearly defined in larval zebrafish due to the difficulty in defining cytoarchitectonic nuclear boundaries in the larval brain. Here we identify the precise location of the larval zebrafish NPO using conserved transcription factor and neuropeptide gene expressions. Our results identify the dorsal half of the preoptic-hypothalamic orthopedia a (otpa) domain as the larval NPO and the homologous region to the mammalian PVN. Further, by reconstructing the locations of cells producing zebrafish neuropeptides that are found in the mammalian PVN (CCK, CRH, ENK, NTS, SS, VIP, OXT, AVP) we provide, for the first time, the 3D arrangement of the NPO neuropeptide map in the larval zebrafish brain. Our results show striking conservation of transcription factor expression (otp, arx, dlx5a, isl1) in and around the NPO/PVN together with neuropeptide expression within it. Finally, we describe the exact anatomical location of cells producing Oxt and Avp in the adult zebrafish. Thus, our results identify the definitive borders and extent of the PVN homologous region in larval zebrafish and serve as an important basis for cross-species comparisons of PVN/NPO structure and function.

Genes / Markers
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Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Engineered Foreign Genes