| Project/Area Number |
06806035
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Basic veterinary science/Basic zootechnical science
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| Research Institution | Nagoya University |
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Principal Investigator |
HIRUNAGI Kanjun Nagoya Univ., Agricultural Sciences, Asso.Prof., 農学部, 助教授 (00126898)
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| Co-Investigator(Kenkyū-buntansha) |
WATANABE Thoru Nagoya Univ., Agricultural Sciences, Pfor., 農学部, 教授 (30023427)
EBIHARA Shizufumi Nagoya Univ., Agricultural Sciences, Asso.Prof., 農学部, 助教授 (50135331)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1995: ¥300,000 (Direct Cost: ¥300,000)
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| Keywords | Pigeon / VIP neuron / GnRH neuron / Deep brain photoreceptor / Lateral septum / Immunoelectron microscopy / 髄液接触ニューロン / VIP |
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| Research Abstract |
In the lateral septum of the avian brain, the presence of vasoactive intestinal polypeptide (VIP) -and gonadotrophin releasing hormone (GnRH) -containing neurons has been reported. An accumulation of VIP-like immunoreactive (ir) neurons is found in the area adjacent to the lateral ventricles which is called pars medialis of lateral septal organ (LSOm) and many of them displayd the characteristic features of CSF-contacting neurons. Recently, this type of neuron is considered as a candidate of deep brain photoreceptor in birds. GnRH-ir neurons are located in the deeper layr of LSOm. In the present study, we used double-labeling techniques at the light (LM) and electron-microscopic (EM) levels to investigate whether VIP-and GnRH-ir neurons communicate in the lateral septum of the pigeon. At the LM levels, VIP-ir neurons and GnRH-ir neurons were seen in close association and some VIP-ir fibers ran near GnRH-ir cell bodies. Examination of these neurons at the EM revealed that VIP-ir axon terminals had synaptoid contacts with perikarya and dendrite of GnRH-ir neurons. These results suggest that VIP neurons could communicate directly with GnRH neurons in the lateral septum of the pigeon and this area might play an important role for reproductive phenomena.
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