start-ver=1.4 cd-journal=joma no-vol=34 cd-vols= no-issue= article-no= start-page=21 end-page=27 dt-received= dt-revised= dt-accepted= dt-pub-year=2018 dt-pub=201804 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Cytoskeletal elements in an acoelomorph worm, Praesagittifera naikaiensis kn-title=無腸動物Praesagittifera naikaiensis における細胞骨格要素 en-subtitle= kn-subtitle= en-abstract= kn-abstract=Acoel flatworms can move in a variety of ways such as muscular and ciliary movements via cytoskeletal elements and their neural regulations. However, those locomotive mechanisms have not yet been fully elucidated. In this study, we examined the distribution of cytoskeletal elements including filamentous actin (F-actin) and tubulin, and the neuroanatomical organization in an acoelomorph worm, Praesagittifera naikaiensis (P. naikaiensis). Video microscopy revealed the elongation/contraction and the bending/rotation processes, and the ciliary gliding movement of P. naikaiensis. Histochemical and morphological analysis demonstrated that F-actin networks of inner longitudinal and outer circular muscle fibers were positioned along the entire surface of the body, and that the average distance between the circular muscle fibers in the contracted organism was decreased in the anterior region compared with that in the elongated organism. Electron microscopy showed dense bodies on the muscle cells of P. naikaiensis, which indicates that those muscle cells have the appearance of vertebrate smooth muscle cells. Immunohistochemical analysis revealed that ?-tubulin-positive signals on the ciliary microtubules had close contact with the F-actin network, and that neurite bundles labelled with anti dSap47 antibody as a neuronal marker run along the anterior-posterior body axis. These results indicate that the well-organized cytoskeletal elements and their neural control systems are preserved in P. naikaiensis, and that their mechanisms involved in those regulation systems are similar to those vertebrate systems. Further studies are needed to clarify the physiological mechanisms underlying the muscular and ciliary movements in P. naikaiensis. en-copyright= kn-copyright= en-aut-name=IkedaRisa en-aut-sei=Ikeda en-aut-mei=Risa kn-aut-name=池田理佐 kn-aut-sei=池田 kn-aut-mei=理佐 aut-affil-num=1 ORCID= en-aut-name=FujiwaraChiho en-aut-sei=Fujiwara en-aut-mei=Chiho kn-aut-name=藤原稚穂 kn-aut-sei=藤原 kn-aut-mei=稚穂 aut-affil-num=2 ORCID= en-aut-name=HamadaMayuko en-aut-sei=Hamada en-aut-mei=Mayuko kn-aut-name=濱田麻友子 kn-aut-sei=濱田 kn-aut-mei=麻友子 aut-affil-num=3 ORCID= en-aut-name=SakamotoTatsuya en-aut-sei=Sakamoto en-aut-mei=Tatsuya kn-aut-name=坂本竜哉 kn-aut-sei=坂本 kn-aut-mei=竜哉 aut-affil-num=4 ORCID= en-aut-name=SaitoNoboru en-aut-sei=Saito en-aut-mei=Noboru kn-aut-name=齋藤昇 kn-aut-sei=齋藤 kn-aut-mei=昇 aut-affil-num=5 ORCID= en-aut-name=AndoMotonori en-aut-sei=Ando en-aut-mei=Motonori kn-aut-name=安藤元紀 kn-aut-sei=安藤 kn-aut-mei=元紀 aut-affil-num=6 ORCID= affil-num=1 en-affil=Graduate School of Education, Okayama University kn-affil=岡山大学大学院教育学研究科 affil-num=2 en-affil=Graduate School of Education, Okayama University kn-affil=岡山大学大学院教育学研究科 affil-num=3 en-affil=Ushimado Marine Institute, Faculty of Science, Okayama University kn-affil=岡山大学・理学部附属臨海実験所 affil-num=4 en-affil=Ushimado Marine Institute, Faculty of Science, Okayama University kn-affil=岡山大学・理学部附属臨海実験所 affil-num=5 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil=岡山大学大学院環境生命科学研究科 affil-num=6 en-affil=Graduate School of Education, Okayama University kn-affil=岡山大学大学院教育学研究科 END start-ver=1.4 cd-journal=joma no-vol= cd-vols= no-issue= article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2020 dt-pub=20200906 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Variation of pro‐vasopressin processing in parvocellular and magnocellular neurons in the paraventricular nucleus of the hypothalamus: Evidence from the vasopressin‐related glycopeptide copeptin en-subtitle= kn-subtitle= en-abstract= kn-abstract=Arginine vasopressin (AVP) is synthesized in parvocellular‐ and magnocellular neuroendocrine neurons in the paraventricular nucleus (PVN) of the hypothalamus. Whereas magnocellular AVP neurons project primarily to the posterior pituitary, parvocellular AVP neurons project to the median eminence (ME) and to extrahypothalamic areas. The AVP gene encodes pre‐pro‐AVP that comprises the signal peptide, AVP, neurophysin (NPII), and a copeptin glycopeptide. In the present study, we used an N‐terminal copeptin antiserum to examine copeptin expression in magnocellular and parvocellular neurons in the hypothalamus in the mouse, rat, and macaque monkey. Although magnocellular NPII‐expressing neurons exhibited strong N‐terminal copeptin immunoreactivity in all three species, a great majority (~90%) of parvocellular neurons that expressed NPII was devoid of copeptin immunoreactivity in the mouse, and in approximately half (~53%) of them in the rat, whereas in monkey hypothalamus, virtually all NPII‐immunoreactive parvocellular neurons contained strong copeptin immunoreactivity. Immunoelectron microscopy in the mouse clearly showed copeptin‐immunoreactivity co‐localized with NPII‐immunoreactivity in neurosecretory vesicles in the internal layer of the ME and posterior pituitary, but not in the external layer of the ME. Intracerebroventricular administration of a prohormone convertase inhibitor, hexa‐d‐arginine amide resulted in a marked reduction of copeptin‐immunoreactivity in the NPII‐immunoreactive magnocellular PVN neurons in the mouse, suggesting that low protease activity and incomplete processing of pro‐AVP could explain the disproportionally low levels of N‐terminal copeptin expression in rodent AVP (NPII)‐expressing parvocellular neurons. Physiologic and phylogenetic aspects of copeptin expression among neuroendocrine neurons require further exploration. en-copyright= kn-copyright= en-aut-name=KawakamiNatsuko en-aut-sei=Kawakami en-aut-mei=Natsuko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=OtuboAkito en-aut-sei=Otubo en-aut-mei=Akito kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=MaejimaSho en-aut-sei=Maejima en-aut-mei=Sho kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=TalukderAshraf H. en-aut-sei=Talukder en-aut-mei=Ashraf H. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=SatohKeita en-aut-sei=Satoh en-aut-mei=Keita kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=OtiTakumi en-aut-sei=Oti en-aut-mei=Takumi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=TakanamiKeiko en-aut-sei=Takanami en-aut-mei=Keiko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=UedaYasumasa en-aut-sei=Ueda en-aut-mei=Yasumasa kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= en-aut-name=ItoiKeiichi en-aut-sei=Itoi en-aut-mei=Keiichi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=9 ORCID= en-aut-name=MorrisJohn F. en-aut-sei=Morris en-aut-mei=John F. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=10 ORCID= en-aut-name=SakamotoTatsuya en-aut-sei=Sakamoto en-aut-mei=Tatsuya kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=11 ORCID= en-aut-name=SakamotoHirotaka en-aut-sei=Sakamoto en-aut-mei=Hirotaka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=12 ORCID= affil-num=1 en-affil=Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=2 en-affil=Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=3 en-affil=Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=4 en-affil=Laboratory of Information Biology, Graduate School of Information Sciences, Tohoku University kn-affil= affil-num=5 en-affil=Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=6 en-affil=Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=7 en-affil=Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=8 en-affil=Department of Physiology, Kyoto Prefectural University of Medicine kn-affil= affil-num=9 en-affil=Laboratory of Information Biology, Graduate School of Information Sciences, Tohoku University kn-affil= affil-num=10 en-affil=Department of Physiology, Anatomy and Genetics, University of Oxford kn-affil= affil-num=11 en-affil=Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=12 en-affil=Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University kn-affil= en-keyword=copeptin kn-keyword=copeptin en-keyword=hypothalamo‐pituitary?adrenal system kn-keyword=hypothalamo‐pituitary?adrenal system en-keyword=immunohistochemistry kn-keyword=immunohistochemistry en-keyword=paraventricular nucleus of the hypothalamus kn-keyword=paraventricular nucleus of the hypothalamus en-keyword=processing kn-keyword=processing en-keyword=vasopressin kn-keyword=vasopressin en-keyword=RRID: AB_2722604 kn-keyword=RRID: AB_2722604 en-keyword=RRID: AB_2061966 kn-keyword=RRID: AB_2061966 en-keyword=RRID: AB_2314234 kn-keyword=RRID: AB_2314234 en-keyword=RRID: AB_10013361 kn-keyword=RRID: AB_10013361 en-keyword=RRID: AB_2313960 kn-keyword=RRID: AB_2313960 en-keyword=RRID: AB_2722605 kn-keyword=RRID: AB_2722605 en-keyword=RRID: AB_90782 kn-keyword=RRID: AB_90782 END start-ver=1.4 cd-journal=joma no-vol=11 cd-vols= no-issue= article-no= start-page=541 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2020 dt-pub=20200819 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Transcriptomic Analysis of the Kuruma PrawnMarsupenaeus japonicusReveals Possible Peripheral Regulation of the Ovary en-subtitle= kn-subtitle= en-abstract= kn-abstract=Crustacean reproduction has been hypothesized to be under complex endocrinological regulation by peptide hormones. To further improve our understanding of the mechanisms underlying this complex regulation, knowledge is needed regarding the hormones not only of the central nervous system (CNS) such as the X-organ/sinus gland (XOSG), brain, and thoracic ganglia, but also the peripheral gonadal tissues. For example, in vertebrates, some gonadal peptide hormones including activin, inhibin, follistatin, and relaxin are known to be involved in the reproductive physiology. Therefore, it is highly likely that some peptide factors from the ovary are serving as the signals among peripheral tissues and central nervous tissues in crustaceans. In this work, we sought to find gonadal peptide hormones and peptide hormone receptors by analyzing the transcriptome of the ovary of the kuruma prawnMarsupenaeus japonicus. The generated ovarian transcriptome data led to the identification of five possible peptide hormones, including bursicon-alpha and -beta, the crustacean hyperglycemic hormone (CHH)-like peptide, insulin-like peptide (ILP), and neuroparsin-like peptide (NPLP). Dominant gene expressions for the bursicons were observed in the thoracic ganglia and the ovary, in the CNS for the CHH-like peptide, in the heart for NPLP, and in the ovary for ILP. Since the gene expressions of CHH-like peptide and NPLP were affected by a CHH (Penaeus japonicussinus gland peptide-I) from XOSG, we produced recombinant peptides for CHH-like peptide and NPLP usingEscherichia coliexpression system to examine their possible peripheral regulation. As a result, we found that the recombinant NPLP increased vitellogenin gene expression in incubated ovarian tissue fragments. Moreover, contigs encoding putative receptors for insulin-like androgenic gland factor, insulin, neuroparsin, and neuropeptide Y/F, as well as several contigs encoding orphan G-protein coupled receptors and receptor-type guanylyl cyclases were also identified in the ovarian transcriptome. These results suggest that reproductive physiology in crustaceans is regulated by various gonadal peptide hormones, akin to vertebrates. en-copyright= kn-copyright= en-aut-name=TsutsuiNaoaki en-aut-sei=Tsutsui en-aut-mei=Naoaki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=KobayashiYasuhisa en-aut-sei=Kobayashi en-aut-mei=Yasuhisa kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=IzumikawaKouichi en-aut-sei=Izumikawa en-aut-mei=Kouichi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=SakamotoTatsuya en-aut-sei=Sakamoto en-aut-mei=Tatsuya kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil=Faculty of Science, Ushimado Marine Institute, Okayama University kn-affil= affil-num=2 en-affil=Faculty of Science, Ushimado Marine Institute, Okayama University kn-affil= affil-num=3 en-affil=Research Institute for Fisheries Science, Okayama Prefectural Technology Center for Agriculture, Forestry, and Fisheries kn-affil= affil-num=4 en-affil=Faculty of Science, Ushimado Marine Institute, Okayama University kn-affil= en-keyword=peptide hormone kn-keyword=peptide hormone en-keyword=Marsupenaeus japonicus kn-keyword=Marsupenaeus japonicus en-keyword=ovary kn-keyword=ovary en-keyword=reproduction kn-keyword=reproduction en-keyword=transcriptome kn-keyword=transcriptome en-keyword=vitellogenesis kn-keyword=vitellogenesis END start-ver=1.4 cd-journal=joma no-vol=21 cd-vols= no-issue=18 article-no= start-page=6748 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2020 dt-pub=20200914 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Introducing the Amphibious Mudskipper Goby as a Unique Model to Evaluate Neuro/Endocrine Regulation of Behaviors Mediated by Buccal Sensation and Corticosteroids en-subtitle= kn-subtitle= en-abstract= kn-abstract=Some fish have acquired the ability to breathe air, but these fish can no longer flush their gills effectively when out of water. Hence, they have developed characteristic means for defense against external stressors, including thirst (osmolarity/ions) and toxicity. Amphibious fish, extant air-breathing fish emerged from water, may serve as models to examine physiological responses to these stressors. Some of these fish, including mudskipper gobies such asPeriophthalmodon schlosseri,Boleophthalmus boddartiand ourPeriophthalmus modestus, display distinct adaptational behaviors to these factors compared with fully aquatic fish. In this review, we introduce the mudskipper goby as a unique model to study the behaviors and the neuro/endocrine mechanisms of behavioral responses to the stressors. Our studies have shown that a local sensation of thirst in the buccal cavity-this being induced by dipsogenic hormones-motivates these fish to move to water through a forebrain response. The corticosteroid system, which is responsive to various stressors, also stimulates migration, possibly via the receptors in the brain. We suggest that such fish are an important model to deepen insights into the stress-related neuro/endocrine-behavioral effects. en-copyright= kn-copyright= en-aut-name=KatayamaYukitoshi en-aut-sei=Katayama en-aut-mei=Yukitoshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=SaitoKazuhiro en-aut-sei=Saito en-aut-mei=Kazuhiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=SakamotoTatsuya en-aut-sei=Sakamoto en-aut-mei=Tatsuya kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil=Ushimado Marine Institute, Faculty of Science, Okayama University kn-affil= affil-num=2 en-affil=Ushimado Marine Institute, Faculty of Science, Okayama University kn-affil= affil-num=3 en-affil=Ushimado Marine Institute, Faculty of Science, Okayama University kn-affil= en-keyword=stressors kn-keyword=stressors en-keyword=thirst kn-keyword=thirst en-keyword=angiotensin II kn-keyword=angiotensin II en-keyword=corticosteroids kn-keyword=corticosteroids en-keyword=amphibious fish kn-keyword=amphibious fish END start-ver=1.4 cd-journal=joma no-vol=525 cd-vols= no-issue=7 article-no= start-page=1586 end-page=1598 dt-received= dt-revised= dt-accepted= dt-pub-year=2017 dt-pub=20170501 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Identification of the sexually dimorphic gastrin-releasing peptide system in the lumbosacral spinal cord that controls male reproductive function in the mouse and Asian house musk shrew (Suncus murinus) en-subtitle= kn-subtitle= en-abstract= kn-abstract=Several regions of the brain and spinal cord control male reproductive function. We previously demonstrated that the gastrin-releasing peptide (GRP) system, located in the lumbosacral spinal cord of rats, controls spinal centers to promote penile reflexes during male copulatory behavior. However, little information exists on the male-specific spinal GRP system in animals other than rats. The objective of this study was to examine the functional generality of the spinal GRP system in mammals using the Asian house musk shrew (Suncus murinus; suncus named as the laboratory strain), a specialized placental mammal model. Mice are also used for a representative model of small laboratory animals. We first isolated complementary DNA encoding GRP in suncus. Phylogenetic analysis revealed that suncus preproGRP was clustered to an independent branch. Reverse transcription-PCR showed that GRP and its receptor mRNAs were both expressed in the lumbar spinal cord of suncus and mice. Immunohistochemistry for GRP demonstrated that the sexually dimorphic GRP system and male-specific expression/distribution patterns of GRP in the lumbosacral spinal cord in suncus are similar to those of mice. In suncus, we further found that most GRP-expressing neurons in males also express androgen receptors, suggesting that this male-dominant system in suncus is also androgen-dependent. Taken together, these results indicate that the sexually dimorphic spinal GRP system exists not only in mice but also in suncus, suggesting that this system is a conserved property in mammals. en-copyright= kn-copyright= en-aut-name=TamuraKei en-aut-sei=Tamura en-aut-mei=Kei kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=KobayashiYasuhisa en-aut-sei=Kobayashi en-aut-mei=Yasuhisa kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=HirookaAsuka en-aut-sei=Hirooka en-aut-mei=Asuka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=TakanamiKeiko en-aut-sei=Takanami en-aut-mei=Keiko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=OtiTakumi en-aut-sei=Oti en-aut-mei=Takumi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=JogaharaTakamichi en-aut-sei=Jogahara en-aut-mei=Takamichi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=OdaSen-ichi en-aut-sei=Oda en-aut-mei=Sen-ichi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=SakamotoTatsuya en-aut-sei=Sakamoto en-aut-mei=Tatsuya kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= en-aut-name=SakamotoHirotaka en-aut-sei=Sakamoto en-aut-mei=Hirotaka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=9 ORCID= affil-num=1 en-affil=Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=2 en-affil=Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=3 en-affil=Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=4 en-affil=Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=5 en-affil=Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=6 en-affil= Laboratory of Animal Management and Resources, Department of Zoology, Okayama University of Science kn-affil= affil-num=7 en-affil= Laboratory of Animal Management and Resources, Department of Zoology, Okayama University of Science kn-affil= affil-num=8 en-affil=Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=9 en-affil=Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University kn-affil= en-keyword=RRID kn-keyword=RRID en-keyword=AB_2060157 kn-keyword=AB_2060157 en-keyword=RRID: AB_2571636 kn-keyword=RRID: AB_2571636 en-keyword=RRID: AB_626757 kn-keyword=RRID: AB_626757 en-keyword=Suncus murinus (suncus) kn-keyword=Suncus murinus (suncus) en-keyword=gastrin-releasing peptide kn-keyword=gastrin-releasing peptide en-keyword=male reproductive function kn-keyword=male reproductive function en-keyword=sexual dimorphism kn-keyword=sexual dimorphism en-keyword=spinal cord kn-keyword=spinal cord END