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23 results on '"Kumada, Nao"'

4. Camera-trapping estimates of the relative population density of Sympetrum dragonflies: application to multihabitat users in agricultural landscapes

Author

Yoshioka, Akira, primary, Mitamura, Toshimasa, additional, Matsuki, Nobuhiro, additional, Shimizu, Akira, additional, Ouchi, Hirofumi, additional, Oguma, Hiroyuki, additional, Jo, Jaeick, additional, Fukasawa, Keita, additional, Kumada, Nao, additional, Jingu, Shoma, additional, and Tabuchi, Ken, additional

Published
2023
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18. Mammal assemblages recorded by camera traps inside and outside the evacuation zone of the Fukushima Daiichi Nuclear Power Plant accident

Author

Kumada Nao, Fukasawa Keita, Mishima Yoshio, Osawa Takeshi, Yoshioka Akira, and Totsu Kumiko

Subjects
0106 biological sciences, Ecology, Continuous monitoring, 010603 evolutionary biology, 01 natural sciences, law.invention, Fukushima daiichi, law, Nuclear power plant, Radioactive contamination, Environmental science, Mammal, Physical geography, Ecology, Evolution, Behavior and Systematics, 010606 plant biology & botany
Abstract

In 2011, the Fukushima Daiichi Power Plant accident resulted in the evacuation of about 81,000 people from the evacuation zone, which suffered from high levels of radioactive contamination. Large-scale and long-term land abandonment can cause changes in species assemblages. Despite the extensive global attention this incident received, open and spatially-explicit datasets of mammal fauna from Fukushima remain quite limited. We established a continuous monitoring protocol using camera traps for mammals both inside and outside the evacuation zone; this paper presents our first dataset. These data represent the monitoring results from 45 camera traps from May 2014 to October 2014, including the location and actuation time of each camera, and the list of video records. After the publication of this initial data paper, we intend to continue monitoring until 2023 and the dataset will be hereafter updated with new observations.

Published
2016
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23. Sympathoexcitatory input from hypothalamic paraventricular nucleus neurons projecting to rostral ventrolateral medulla is enhanced after myocardial infarction.

Author

Koba S, Hanai E, Kumada N, and Watanabe T

Subjects
Animals, Disease Models, Animal, Male, Medulla Oblongata metabolism, Neural Pathways metabolism, Neural Pathways physiopathology, Neuroanatomical Tract-Tracing Techniques, Optogenetics, Paraventricular Hypothalamic Nucleus metabolism, Rats, Sprague-Dawley, Sympathetic Nervous System metabolism, Heart Failure physiopathology, Kidney innervation, Medulla Oblongata physiopathology, Myocardial Infarction physiopathology, Paraventricular Hypothalamic Nucleus physiopathology, Sympathetic Nervous System physiopathology, Vasomotor System physiopathology
Abstract

Elevated sympathetic vasomotor tone seen in heart failure (HF) may involve dysfunction of the hypothalamic paraventricular nucleus neurons that project to the rostral ventrolateral medulla (PVN-RVLM neurons). This study aimed to elucidate the role of PVN-RVLM neurons in the maintenance of resting renal sympathetic nerve activity (RSNA) after myocardial infarction (MI). In male rats, the left coronary artery was chronically ligated to induce MI. The rats received PVN microinjections of an adeno-associated viral (AAV) vector encoding archaerhodopsin T (ArchT) with the reporter yellow fluorescence protein (eYFP). The ArchT rats had abundant distributions of eYFP-labeled, PVN-derived axons in the RVLM. In anesthetized ArchT rats with MI ( n = 12), optogenetic inhibition of the PVN-RVLM pathway achieved by 532-nm-wavelength laser illumination to the RVLM significantly decreased RSNA. This effect was not found in sham-operated ArchT rats ( n = 6). Other rat groups received RVLM microinjections of a retrograde AAV vector encoding the red light-drivable halorhodopsin Jaws (Jaws) with the reporter green fluorescence protein (GFP) and showed expression of GFP-labeled cell bodies and dendrites in the PVN. Laser illumination of the PVN at a 635 nm wavelength elicited significant renal sympathoinhibition in Jaws rats with MI ( n = 9) but not in sham-operated Jaws rats ( n = 8). These results indicate that sympathoexcitatory input from PVN-RVLM neurons is enhanced after MI, suggesting that this monosynaptic pathway is part of the central nervous system circuitry that plays a critical role in generating an elevated sympathetic vasomotor tone commonly seen with HF. NEW & NOTEWORTHY Using optogenetics in rats, we report that sympathoexcitatory input from hypothalamic paraventricular nucleus neurons that project to the rostral ventrolateral medulla is enhanced after myocardial infarction. It is suggested that this monosynaptic pathway makes up a key part of central nervous system circuitry underlying sympathetic hyperactivation commonly seen in heart failure.

Published
2020
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