Publications by authors named "Atsushi Asano"

Glutamic acid (Glu) and fat are recognized as primary flavor components in meat. This study aimed to determine the discrimination threshold of an untrained panel for Glu and fat in meat. Thirty-two untrained panelists were recruited among research institute employees.

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Management of a small renal mass and a renal stone in the same kidney presents several dilemmas. Simultaneous robot-assisted partial nephrectomy and pyelolithotomy via the same surgical access site is a reasonable approach in a patient with both entities. An 80-year-old woman was diagnosed with a 2.

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Real-time visualisation of chick embryo development occurring inside an opaque eggshell is a major goal of developmental biology. This goal was partially achieved when 3-day-old embryos recovered from fertilised shelled eggs, preincubated in a conventional incubator, hatched after the egg contents had been transferred into shell-less embryo culture systems constructed of transparent plastic film placed in a plastic cup. However, the hatchable shell-less embryo culture systems described thus far cannot be used to visualise the dynamic morphological changes associated with the emergence of major organ systems during the first 3 days of embryo development, as the blastoderm area needs to be covered with an opaque membrane.

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Glucagon-like peptide-1 (GLP-1) is an incretin released into the gastrointestinal tract after food ingestion, and stimulates insulin secretion from the beta cells of the pancreatic islets. Incretins have recently been reported to have extrapancreatic actions, and they are anticipated to have potential efficacy for conditions such as male infertility as well as diabetes. However, the effects of incretins on male reproductive function remain unclear.

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The preservation of liquid semen is pivotal for both industrial livestock production and genetic management/conservation of species with sperm that are not highly cryo-tolerant. Nevertheless, with regard to poultry semen, even brief in vitro storage periods can lead to a notable decline in fertility, despite the in vivo capacity to maintain fertility for several weeks when within the hen's sperm storage tubules. For fertility in sperm, intracellular calcium ions ([Ca]i) play a key role in signaling towards modifying energy metabolism.

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Article Synopsis
  • The murine epididymis has 10 segments that are critical for understanding how sperm matures, but little is known about the specific functions of these segments.
  • This study focuses on the ganglioside GM1, which is important for sperm capacitation, and discovers that GM1-enriched vesicles are uniquely found in segment 2 of the epididymis.
  • The presence of these vesicles changes in certain mouse models and after specific surgical interventions, suggesting that they play a significant role in sperm development and highlighting the distinct physiology of different epididymal segments.
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Cytochromes P450 (P450s or CYPs) are important drug-metabolizing enzymes. Because dogs are frequently used in drug metabolism studies, knowledge of dog CYP2C enzymes is essential because in humans these enzymes are abundant and play major roles in liver and intestine. The present study identified and characterized novel dog CYP2C94 along with previously identified dog CYP2C21 and CYP2C41.

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Introduction: Squamous cell carcinoma arising from a suprapubic cystostomy tract is a rare complication of an indwelling catheter and is caused by long-term inflammation and mechanical irritation. Prognosis is relatively poor. Biomarkers in the cancer pathway have not been investigated.

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Despite its importance in gamete utilization for livestock production, poultry semen cryopreservation in a liquid state, is limited in the poultry industry due to a significant decline in sperm viability and functionality during liquid storage. Lipopolysaccharide (LPS) is released from gram-negative bacteria and impairs sperm function in mammals. Using exogeneous LPS, we show this endotoxin compromises sperm viability and function, including motility and penetrability to the inner peri-vitelline layer (IPVL) during liquid storage at 4 °C.

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Can commodity polymers are made to be healable just by blending with self-healable polymers? Here we report the first study on the fundamental aspect of this practically challenging issue. Poly(ether thiourea) (PTUEG ; T =27 °C) reported in 2018 is extraordinary in that it is mechanically robust but can self-heal even at 12 °C. In contrast, poly(octamethylene thiourea) (PTUC ; T =50 °C), an analogue of PTUEG , cannot heal below 92 °C.

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Pigs are an important species used in drug metabolism studies; however, the cytochromes P450 (P450s or CYPs) have not been fully investigated in pigs.In this study, pig CYP2C32, CYP2C33, CYP2C34, CYP2C36, CYP2C42, and CYP2C49 cDNAs were isolated and found to contain open reading frames of 490 or 494 amino acids that shared 64-82% sequence identity with human CYP2C8/9/18/19.Pig genes formed a gene cluster in a genomic region that corresponded to that of the human cluster; an additional gene cluster was formed by pig and distant from the first cluster but located in the same chromosome.

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The effects of oxygen gas injection starting on day 17 of incubation (D17) in a chick shell-less culture system (cSLC) on the subsequent embryo development were examined on day 19 of incubation (D19). On D19 of cSLC, the plasma phosphorus and total cholesterol concentrations of the embryos were significantly higher (<0.05), while the plasma calcium concentrations were significantly lower (<0.

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Arylamine -acetyltransferases (NATs) are drug-metabolizing enzymes that are essential for the metabolism of endogenous substrates and xenobiotics. The molecular characteristics of NATs have been extensively investigated in humans but remain to be investigated in common marmosets and pigs, animal species that are often used in drug metabolism studies. In this study, marmoset NAT1 and pig NAT1 cDNAs were isolated from liver samples and were characterized by molecular analyses and drug-metabolism assays.

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Cytochrome P450s (P450s) have been identified and analyzed in dogs and pigs, species that are often used in preclinical drug studies. Moreover, P450s are clinically important for drug therapy not only in humans, but also in species under veterinary care, including dogs and cats. In the present study, seven P450s homologous to human CYP2J2, namely, dog CYP2J2; cat CYP2J2; and pig CYP2J33, CYP2J35, CYP2J91, and CYP2J93, were newly identified and characterized, along with pig CYP2J34 previously identified.

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Article Synopsis
  • Fertilization involves complex molecular processes that occur at various scales, and sperm must utilize existing pathways since they are not actively transcribing or translating proteins.
  • Differences among species affect how sperm respond to external signals, complicating our understanding of how signaling pathways activate in poultry sperm.
  • This review highlights three critical stages related to sperm membrane changes: maturation post-testicular, regulation of sperm-egg binding and acrosome reaction, and the application of membrane raft theory for poultry production and preservation.
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This study examined the effects of calcium lactate on the development of chicken embryos in a shell-less culture system (cSLCS) up to the seventeenth day of incubation. In the presence of calcium lactate, a significant reduction in embryo viability was observed during the first week of incubation in cSLCS. On day 17 of embryo development, no significant difference was observed in the blood plasma calcium concentration or tibia bone density between cSLCS and intact control embryos, whereas the tibia length was significantly shorter in cSLCS embryos than in the intact control.

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Introduction: Treatment-refractory metastatic castration-resistant prostate cancer is a heterogeneous disease classified into androgen receptor-high prostate cancer, androgen receptor-low prostate cancer, amphicrine prostate cancer co-expressing androgen receptor and neuroendocrine genes, double-negative prostate cancer lacking androgen receptor and neuroendocrine gene expression, and small cell or neuroendocrine prostate cancer without androgen receptor activity. Double-negative tumors can convert to the squamous phenotype.

Case Presentation: A 62-year-old man was newly diagnosed with prostate cancer (serum prostate-specific antigen 2613 ng/mL, Gleason score 4 + 5 = 9, cT3aN1M1b) that progressed to castration resistance 4 months after starting abiraterone with androgen deprivation therapy.

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Adenosine triphosphate (ATP) production via glycolysis and oxidative phosphorylation is essential for the maintenance of flagellar motility in sperm; however, the primary energy production pathways supporting fertilization vary among species. Inconsistency in thought exists regarding which pathways maintain ATP production and sperm motility in poultry. Glycolysis and mitochondrial oxidation contribute to flagellar motion in chicken sperm, but the relative dependence on these pathways for motility and penetrability into the inner perivitelline layer remains unclear.

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Although mechanically robust polymer materials had not been thought to self-heal, we recently found that poly(ether thiourea) PTUEG, which is a glassy polymer with high mechanical strength, self-heals even at ambient temperatures. This finding updated the above preconception. Nevertheless, it should also be noted that PTUEG, under high humidity, absorbs water and is plasticized to lose its mechanical strength.

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(Objectives) We examined the treatment outcomes in cases of chronic unilateral hematuria treated using flexible ureteroscope for observation and hemostasis. (Methods) The study included 14 patients (7 men and 7 women) with a median age of 56.5 years who underwent ureteroscopy using a digital flexible ureteroscope for chronic unilateral hematuria between March 2014 and August 2019.

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The acrosome reaction (AR) is a strictly-regulated, synchronous exocytosis that is required for sperm to penetrate ova. This all-or-nothing process occurs only once in the sperm lifecycle through a sequence of signaling pathways. Spontaneous, premature AR therefore compromises fertilization potential.

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Article Synopsis
  • Glucose is essential for sperm motility and fertility, with GLUT1 being a key glucose transporter in mammalian sperm, but its role in avian sperm, particularly chickens, is less understood.
  • In this study, researchers found that GLUT1 is localized in the midpiece of chicken spermatozoa and plays a significant role in glucose-mediated motility, as glucose enhances sperm movement for up to 80 minutes.
  • The study also highlighted that inhibiting GLUT1 reduced glucose uptake and ATP production, which negatively impacted sperm movement, revealing complex interactions between glycolysis and mitochondrial activity in avian sperm motility.
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The effect of adding ethylammonium nitrate (EAN), which is an ionic liquid (IL), on the aggregate formation of α-synuclein (α-Syn) in aqueous solution has been investigated. FTIR and Raman spectroscopy were used to investigate changes in the secondary structure of α-Syn and in the states of water molecules and EAN. The results presented here show that the addition of EAN to α-Syn causes the formation of an intermolecular β-sheet structure in the following manner: native disordered state → polyproline II (PPII)-helix → intermolecular β-sheet (α-Syn amyloid-like aggregates: α-SynA).

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SF/polyurethane composite non-woven sheet was fabricated to evaluate the cardiovascular tissue engineering materials in the wet state. The compatibility and microstructure analyses were carried out on the fabricated SF/polyurethane composite non-woven sheet by thermal analysis and solid-state NMR analysis in the wet state. To evaluate the modulus of elasticity, a tensile test was performed and supported with dynamic viscoelasticity and mechanical analysis.

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Despite knowledge that glucose metabolism is essential for the regulation of signaling cascades in the sperm that are pre-assembled into specific areas and function at multistage for fertilization, the physiological roles of glucose in avian sperm are poorly understood. Accumulated results of studies conducted in our laboratory and others indicate that sperm possess membrane microdomains, or membrane rafts, which play important roles in several processes, including the induction of acrosome reaction (AR). When characterizing proteomes associated with chicken sperm rafts, we observed marked enrichment of glucose transporter 3 (GLUT3).

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