Ontogenetic changes in neuropeptide Y-like-immunoreactivity in the terminal nerve of the chum salmon and the cloudy dogfish, with special reference to colocalization with gonadotropin-releasing hormone-immunoreactivity.
We observed ontogenetic changes of neuropeptide Y (NPY)-like-immunoreactivity in the terminal nerve (TN) of the chum salmon, a teleost, and the cloudy dogfish, an elasmobranch. In the chum salmon, NPY-like-immunoreactive (NPY-IR) cells first appeared in the olfactory placode of embryos at 16 days after fertilization, and then extended sequentially and centrally in the olfactory system. Colocalization of NPY- and gonadotropin-releasing hormone (GnRH)-like-immunoreactivities was also observed in TN ganglion cells. In the cloudy dogfish, NPY-IR cells first appeared in the rudimental TN ganglion of the embryo at the 40 mm stage. Then, the NPY-IR cells and fibers in the TN system increased in density during late embryonic periods. Colocalization of NPY- and GnRH-like-immunoreactivities in TN ganglion cells was not found in the developing or the adult dogfish.
Chiba
A
A
Department of Biology, School of Dentistry at Niigata, Nippon Dental University, Japan.
Oka
S
S
Honma
Y
Y
D000367:Age Factors; D000818:Animals; D000918:Antibody Specificity; D004284:Dogfish / Q000502:physiology*; D007987:Gonadotropin-Releasing Hormone / Q000032:analysis / Q000276:immunology*; D007150:Immunohistochemistry; D009478:Neuropeptide Y / Q000032:analysis / Q000276:immunology*; D009832:Olfactory Nerve / Q000737:chemistry; D017685:Oncorhynchus keta / Q000502:physiology*; D017729:Presynaptic Terminals / Q000737:chemistry*; D013045:Species Specificity
D009478:Neuropeptide Y; D007987:Gonadotropin-Releasing Hormone