The fine structures of the VIP-Like immunoreactive neurons in the cat hypothalamus |
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| Authors: | HL Obata-Tsuto T Tsuto H Okamura T Kubo F Fukui N Yanaihara Y Ibata |
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| Institution: | 1. Department of Anatomy, Kyoto Prefectural, University of Medicine Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602, Japan;1. First Department of Surgery, Kyoto Prefectural, University of Medicine Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602, Japan;2. Department of Orthopedics,Kyoto Prefectural, University of Medicine Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602, Japan;3. Department of Neuropsychiatry, Kyoto Prefectural, University of Medicine Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602, Japan;4. Laboratory of Bioorganic Chemistry, Shizuoka College of Pharmacy, Sizuoka 422 Japan;2. Okazaki National Research Institute, National Institute for Physiological Sciences Department of Molecular Physiology, Laboratory of Neurochemistry Nishigonaka 38, Myodaiji, Okazaki 444,Japan |
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| Abstract: | The fine structures of the VIP-like immunoreactive neurons in the suprachiasmatic nucleus (SCN) and the arcuate nucleus ( ARN ) of the cat hypothalamus were investigated by electron microscopic immunocytochemistry. The VIP-like immunoreactive soma and fibers could be successfully visualized by a modified PAP method. VIP-like immunoreactive neurons in both nuclei contained immunoreactive rER, Golgi complexes and many immunoreactive granules, as well as well developed mitochondria. VIP-like immunoreactive synaptic endings with synaptic membrane specialization of Gray's type I and II were found in the SCN. Moreover VIP-like immunoreactive preterminal elements that made synaptic contact with VIP-like immunoreactive neuronal soma were also detected. On the other hand, it was difficult to detect typical preterminal endings with immunoreactivity in the ARN ; however, VIP-like immunoreactive processes in contact with the basement membrane of the capillaries were observed. These observations indicate that VIP-like immunoreactive neurons in the SCN act as intrinsic neurons and are involved in neuroendocrine function in ARN . |
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| Keywords: | Suprachiasmatic nucleus Cat hypothalamus VIP-like immunoreactive neurons |
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