Yoshio Takei
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View article: What comparative endocrinology tells us about the original function of the insulin superfamily
What comparative endocrinology tells us about the original function of the insulin superfamily Open
Comparative endocrinology is a research subfield in endocrinology that delves into deeper understanding of the endocrine system from an evolutionary or phylogenetic perspective. To date, this approach has contributed significantly to the d…
View article: Isospin breaking in the $^{71}$Kr and $^{71}$Br mirror system
Isospin breaking in the $^{71}$Kr and $^{71}$Br mirror system Open
Isospin symmetry is a fundamental concept in nuclear physics. Even though isospin symmetry is partially broken, it holds approximately for most nuclear systems, which makes exceptions very interesting from the nuclear structure perspective…
View article: Circulating isotocin, not angiotensin II, is the major dipsogenic hormone in eels
Circulating isotocin, not angiotensin II, is the major dipsogenic hormone in eels Open
Angiotensin II (AngII) is generally known as the most important dipsogenic hormone throughout vertebrates, while two other neurohypophysial hormones, vasopressin and oxytocin, are not dipsogenic in mammals. In this study, we found that sys…
View article: Additional file 1 of The digestive tract as an essential organ for water acquisition in marine teleosts: lessons from euryhaline eels
Additional file 1 of The digestive tract as an essential organ for water acquisition in marine teleosts: lessons from euryhaline eels Open
Additional file 1: Supplementary Table 1. Primer sequences for quantitative real time PCR
View article: Two-proton Radioactivity: the Interesting Case of \(^{67}\)Kr and Further Studies
Two-proton Radioactivity: the Interesting Case of \(^{67}\)Kr and Further Studies Open
We report on the observation of 67Kr that has been produced in an experiment
\nperformed at the RIKEN/BigRIPS facility. The two-proton decay
\nof 67Kr has been evidenced and this nucleus is thus the fourth observed long
\nlived ground-stat…
View article: Molecular mechanisms for intestinal HCO<sub>3</sub><sup>-</sup>secretion and its regulation by guanylin in seawater-acclimated eels
Molecular mechanisms for intestinal HCO<sub>3</sub><sup>-</sup>secretion and its regulation by guanylin in seawater-acclimated eels Open
The intestine of marine teleosts secretes HCO 3 - into the lumen and precipitates Ca 2+ and Mg 2+ in the imbibed seawater as carbonates to decrease luminal fluid osmolality and facilitate water absorption. However, reports on studies on th…
View article: Gastrointestinal: A case of small bowel obstruction caused by a bezoar, preoperatively found by double‐balloon enteroscopy
Gastrointestinal: A case of small bowel obstruction caused by a bezoar, preoperatively found by double‐balloon enteroscopy Open
An 80-year-old woman with a medical history of hypertension was admitted to our hospital because of recurring abdominal pain and vomiting for 2 months. At a previous hospital, an abdominal computed tomography (CT) detected a dilatated smal…
View article: Molecular mechanisms for intestinal HCO3− secretion and its regulation by guanylin in seawater-acclimated eels
Molecular mechanisms for intestinal HCO3− secretion and its regulation by guanylin in seawater-acclimated eels Open
The intestine of marine teleosts secretes HCO3− into the lumen and precipitates Ca2+ and Mg2+ in the imbibed seawater as carbonates to decrease luminal fluid osmolality and facilitate water absorption. However, hormonal regulation of HCO3−…
View article: The Amphibious Mudskipper: A Unique Model Bridging the Gap of Central Actions of Osmoregulatory Hormones Between Terrestrial and Aquatic Vertebrates
The Amphibious Mudskipper: A Unique Model Bridging the Gap of Central Actions of Osmoregulatory Hormones Between Terrestrial and Aquatic Vertebrates Open
Body fluid regulation, or osmoregulation, continues to be a major topic in comparative physiology, and teleost fishes have been the subject of intensive research. Great progress has been made in understanding the osmoregulatory mechanisms …
View article: Drinking by amphibious fish: convergent evolution of thirst mechanisms during vertebrate terrestrialization
Drinking by amphibious fish: convergent evolution of thirst mechanisms during vertebrate terrestrialization Open
Thirst aroused in the forebrain by angiotensin II (AngII) or buccal drying motivates terrestrial vertebrates to search for water, whereas aquatic fish can drink surrounding water only by reflex swallowing generated in the hindbrain. Indeed…
View article: Renoguanylin stimulates apical CFTR translocation and decreases HCO3− secretion through PKA activity in the Gulf toadfish (<i>Opsanus beta</i>)
Renoguanylin stimulates apical CFTR translocation and decreases HCO3− secretion through PKA activity in the Gulf toadfish (<i>Opsanus beta</i>) Open
The guanylin peptides – guanylin, uroguanylin, and renoguanylin (RGN) – are endogenously produced hormones in teleost fish enterocytes that are activators of guanylyl cyclase-C (GC-C) and are potent modulators of intestinal physiology, par…
View article: Development of an animal-borne blood sample collection device and its deployment for the determination of cardiovascular and stress hormones in phocid seals
Development of an animal-borne blood sample collection device and its deployment for the determination of cardiovascular and stress hormones in phocid seals Open
An animal-borne blood sampler with data-logging functions was developed for phocid seals, which collected two blood samples for the comparison of endocrinological/biochemical parameters under two different conditions. The sampler can be tr…
View article: Sulfur utilization of corals is enhanced by endosymbiotic algae
Sulfur utilization of corals is enhanced by endosymbiotic algae Open
Sulfur-containing compounds are important components of all organisms, but few studies have explored sulfate utilization in corals. Our previous study found that the expression of a sulfur transporter (SLC26A11) was upregulated in the pres…
View article: The role of the rectum in osmoregulation and the potential effect of renoguanylin on SLC26a6 transport activity in the Gulf toadfish (<i>Opsanus beta</i>)
The role of the rectum in osmoregulation and the potential effect of renoguanylin on SLC26a6 transport activity in the Gulf toadfish (<i>Opsanus beta</i>) Open
Teleosts living in seawater continually absorb water across the intestine to compensate for branchial water loss to the environment. The present study reveals that the Gulf toadfish ( Opsanus beta) rectum plays a comparable role to the pos…
View article: Circulating fibrocytes correlate with the asthma control test score
Circulating fibrocytes correlate with the asthma control test score Open
The results of this study showed that the number of circulating fibrocytes is inversely correlated with clinical asthma control parameters, further supporting the relevance of measuring circulating fibrocytes as a marker of clinical contro…
View article: The differential role of renoguanylin in osmoregulation and apical Cl<sup>−</sup>/HCO<sub>3</sub><sup>−</sup>exchange activity in the posterior intestine of the Gulf toadfish (<i>Opsanus beta</i>)
The differential role of renoguanylin in osmoregulation and apical Cl<sup>−</sup>/HCO<sub>3</sub><sup>−</sup>exchange activity in the posterior intestine of the Gulf toadfish (<i>Opsanus beta</i>) Open
The guanylin family of peptides are effective regulators of intestinal physiology in marine teleosts. In the distal intestinal segments, they inhibit or reverse fluid absorption by inhibiting the absorptive short-circuit current ( I sc ). …
View article: From Aquatic to Terrestrial Life: Evolution of the Mechanisms for Water Acquisition
From Aquatic to Terrestrial Life: Evolution of the Mechanisms for Water Acquisition Open
It is generally accepted that ancient fishes first experienced freshwater (FW), and then variably by lineage moved onto the land or re-entered the seas during evolution. As both land and sea are desiccating environments, animals must chang…