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Transgenic approach to express the channelrhodopsin 2 gene in arginine vasopressin neurons of rats.

Authors
  • Ishii, Masahiro1
  • Hashimoto, Hirofumi2
  • Ohkubo, Jun-Ichi3
  • Ohbuchi, Toyoaki3
  • Saito, Takeshi4
  • Maruyama, Takashi2
  • Yoshimura, Mitsuhiro2
  • Yamamoto, Yukiyo5
  • Kusuhara, Koichi5
  • Ueta, Yoichi6
  • 1 Department of Physiology, University of Occupational and Environmental Health, Kitakyushu, 807-8555 Japan; Department of Pediatrics, University of Occupational and Environmental Health, Kitakyushu, 807-8555 Japan. , (Japan)
  • 2 Department of Physiology, University of Occupational and Environmental Health, Kitakyushu, 807-8555 Japan. , (Japan)
  • 3 Department of Otorhinolaryngology-Head and Neck Surgery, University of Occupational and Environmental Health, Kitakyushu, 807-8555 Japan. , (Japan)
  • 4 Department of Neurosurgery, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, 807-8555 Japan. , (Japan)
  • 5 Department of Pediatrics, University of Occupational and Environmental Health, Kitakyushu, 807-8555 Japan. , (Japan)
  • 6 Department of Physiology, University of Occupational and Environmental Health, Kitakyushu, 807-8555 Japan. Electronic address: [email protected] , (Japan)
Type
Published Article
Journal
Neuroscience letters
Publication Date
Sep 06, 2016
Volume
630
Pages
194–198
Identifiers
DOI: 10.1016/j.neulet.2016.08.001
PMID: 27493075
Source
Medline
Keywords
License
Unknown

Abstract

Optogenetics provides a powerful tool to regulate neuronal activity by light-sensitive ion channels such as channelrhodopsin 2 (ChR2). Arginine vasopressin (AVP; also known as the anti-diuretic hormone) is a multifunctional hormone which is synthesized in the magnocellular neurosecretory cells (MNCs) of the hypothalamus. Here, we have generated a transgenic rat that expresses an AVP-ChR2-enhanced green fluorescent protein (eGFP) fusion gene in the MNCs of the hypothalamus. The eGFP fluorescence that indicates the expression of ChR2-eGFP was observed in the supraoptic nucleus (SON) and in the magnocellular division of the paraventricular nucleus (PVN) that is known to contain AVP-secreting neurons. The eGFP fluorescence intensities in those nuclei and posterior pituitary were markedly increased after chronic salt loading (2% NaCl in drinking water for 5days). ChR2-eGFP was localized mainly in the membrane of AVP-positive MNCs. Whole-cell patch-clamp recordings were performed from single MNCs isolated from the SON of the transgenic rats, and blue light evoked repetitive action potentials. Our work provides for the first time an optogenetic approach to selectively activate AVP neurons in the rat.

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