Publications by authors named "Tsukahara S"

In organisms ranging from vertebrates to plants, major components of centromeres are rapidly evolving repeat sequences, such as tandem repeats (TRs) and transposable elements (TEs), which harbour centromere-specific histone H3 (CENH3). Complete centromere structures recently determined in human and Arabidopsis suggest frequent integration and purging of retrotransposons within the TR regions of centromeres. Despite the high impact of 'centrophilic' retrotransposons on the paradox of rapid centromere evolution, the mechanisms involved in centromere targeting remain poorly understood in any organism.

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  • - The study examined the outcomes of laparoscopic retroperitoneal lymph node dissection (RPLND) in post-chemotherapy patients with nonseminomatous testicular germ-cell tumors at Kyushu University Hospital between 2016 and 2024.
  • - A total of 13 patients participated, with median tumor sizes of 11 mm, and the procedure showed low median blood loss (27 mL) and no severe complications.
  • - The results indicate that laparoscopic RPLND is a safe and effective minimally invasive option for selected patients, with no recurrence noted during a median follow-up of 18.6 months.
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  • * Researchers enrolled patients who underwent robotic prostate surgery, categorizing tumor locations based on pathology and imaging results, and assessed the effectiveness of side-specific lymph node removal.
  • * Results showed high detection accuracy for positive lymph nodes with a targeted approach, suggesting that tumor location-guided surgical strategies may lower the need for more extensive procedures while maintaining acceptable risk levels.
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[Purpose] This study aimed to clarify the association between phase angle (PhA) and the level of independence in daily living among institutionalized super older females requiring nursing care. [Participants and Methods] This three-facility cross-sectional study enrolled 173 nursing home residents (mean age 91.0 years, standard deviation 4.

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Various methods have been developed for measuring the surface tension of liquids, and the present study proposes a new method for measuring the surface tension of liquids. A small (9 mm diameter) round liquid surface was excited by sound waves with a common speaker. Nine liquids possessing various physical properties and functional groups were employed, and three resonance frequencies () were observed for each liquid in a frequency range of 20-180 Hz.

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  • Proton pump inhibitors (PPIs) are commonly used medications that may affect cancer treatment outcomes, particularly in patients with metastatic castration-resistant prostate cancer (mCRPC) receiving androgen receptor signaling inhibitors (ARSIs).
  • A study compared the effects of PPI usage on progression-free survival (PFS) and overall survival (OS) in two groups of mCRPC patients, finding that those not using PPIs (PPI-) had better PFS and OS rates than those using them (PPI+).
  • Results indicated that the PPI- group had higher PSA response rates, suggesting that PPIs may reduce the effectiveness of ARSIs in cancer treatment, warranting further research to understand the underlying mechanisms.
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  • - This study explores how androgen receptor (AR)-targeting therapy leads to oxidative stress in prostate cancer, focusing on the underlying mechanisms of this stress induction.
  • - Researchers found that reactive oxygen species (ROS) generated due to AR inhibition are linked to peroxisomes and specifically involve the PPARA gene, which is activated during this process.
  • - Targeting PPARα, through gene silencing or small molecule inhibitors, enhances cancer cell sensitivity to antiandrogens like enzalutamide, suggesting a potential new therapeutic strategy in prostate cancer treatment.
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  • This study investigated the relationship between calf and neck circumferences and skeletal muscle indices in elderly Japanese nursing home residents.
  • Conducted with 72 participants averaging 85.9 years old, the study used measuring tapes for circumference and a bioimpedance device for body composition assessment.
  • Results indicated that calf circumference strongly correlated with body composition metrics, while neck circumference showed weak correlation, suggesting calf circumference is a better indicator for health evaluations in this demographic.
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  • Androgen receptor signaling is key for prostate cancer treatment resistance, particularly in the context of increased expression of 3β-hydroxysteroid dehydrogenases (3βHSDs), with 3βHSD1 being notably involved in this process.
  • Castration-resistant tumors show elevated 3βHSD levels, highlighting their role in resistance to androgen receptor inhibitors and linking them to the regulation of the enzyme through various factors.
  • The HSD3B1 genotype, especially the rs1047303 variant, affects treatment outcomes and emphasizes the potential for personalized medicine, suggesting that targeting 3βHSDs could be an effective approach for improving prostate cancer therapy.
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  • In avian embryos, exposure to xenoestrogens like ethynylestradiol (EE2) disrupts the normal development of reproductive organs, particularly affecting the testes and Müllerian ducts (MDs).
  • The study found that EE2 led to unusual gene expression patterns, resulting in ovary-like tissues in the left testis and hypertrophy of female MDs while suppressing male MD atrophy, indicating its feminizing effects.
  • RNA sequencing revealed significant changes in gene expression, with EE2 reducing the asymmetric gene expression crucial for normal MD development, suggesting a molecular basis for reproductive organ abnormalities in birds exposed to xenoestrogens.
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Ferroptosis is a form of regulated cell death that is induced by inhibiting glutathione peroxidase 4 (GPX4), which eliminates lipid peroxidation. Ferroptosis induction is influenced by the cell environment. However, the cellular states altering ferroptosis susceptibility remain largely unknown.

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Purpose: This study presents the surgical and oncological outcomes of salvage robot-assisted radical prostatectomy (RARP) after carbon ion radiotherapy at a single institution.

Methods: Patients who underwent salvage RARP for local recurrence after carbon ion radiotherapy at Kyushu University Hospital between 2020 and 2023 were included. A single surgeon performed salvage RARP with extended pelvic lymph node dissection.

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Objectives: Excellent anticancer effect for solid tumors with microsatellite instability (MSI)-high by anti-PD-1 antibody has been reported. In this study, we investigated the clinical impact of MSI status in bladder cancer.

Methods: This study included 205 Japanese patients who underwent transurethral resection for bladder cancer between 2005 and 2021.

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Background: Early detection of biochemical recurrence (BCR) after radical prostatectomy (RP) is crucial for early treatment and improving survival outcomes. The optimal prostate-specific antigen (PSA) monitoring remains unclear, and several models have been proposed. We aimed to externally validate four models for optimal PSA monitoring after RP and propose modifications to improve them.

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In ovo exposure to o,p'-dichloro-diphenyl-trichloroethane (o,p'-DDT) impairs reproduction by inducing malformation of the reproductive organs in birds, although the mechanism remains unclear. Here, we examined the effects of o,p'-DDT on the development of the reproductive organs, the expression of genes controlling sexual differentiation, and the plasma concentrations of testosterone and estradiol in Japanese quail embryos. o,p'-DDT-containing sesame oil was injected into the yolk sac on Embryonic Day (E) 3 at a dose of 500, 2,000, or 8,000 μg per egg.

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[Purpose] The present study aimed to investigate the association of phase angle with the continuing activities of residents in a geriatric health service facility for one year. We compared the phase angle among current residents in a geriatric health service facility with those who died within one year. [Participants and Methods] This one-year prospective observational study included 149 residents who entered a geriatric health service facility.

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  • A study was conducted to compare the adverse events (AEs) of two treatment combinations—cabozantinib (CAB) plus nivolumab (NIVO) and ipilimumab (IPI) plus NIVO—for metastatic renal cell carcinoma using a large real-world dataset.
  • The research analyzed data from the FDA Adverse Event Reporting System and identified that CAB + NIVO resulted in higher incidence rates for seven types of AEs, whereas IPI + NIVO had higher rates for three types of AEs, with serious AEs being more common in the IPI + NIVO group.
  • The findings indicate that different combinations of therapies produce varied toxicities, which can guide clinicians in selecting the most appropriate treatment for patients
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The medial preoptic area (MPOA) is a sexually dimorphic region of the brain that regulates social behaviors. The sexually dimorphic nucleus (SDN) of the MPOA has been studied to understand sexual dimorphism, although the anatomy and physiology of the SDN is not fully understood. Here, we characterized SDN neurons that contribute to sexual dimorphism and investigated the mechanisms underlying the emergence of such neurons and their roles in social behaviors.

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Background/aim: Testosterone is essential for prostate cancer development and growth. This study aimed to investigate the relationship between testosterone in seminal vesicles and prostate cancer incidence and its malignant phenotype.

Patients And Methods: After obtaining institutional review board approval, seminal vesicle fluid samples were collected from patients who underwent prostatectomy or cystectomy.

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The novel technique of lateral pelvic fascia preservation (LPFP) in robot-assisted radical prostatectomy (RARP) has been reported to improve urinary continence recovery. We aimed to investigate surgical and oncological outcomes after RARP using the LPFP technique and compare them with conventional RARP. This study included patients who underwent RARP with and without the LPFP technique.

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This study investigated cellular mechanisms in steroidogenesis responsible for treatment resistance to the novel antiandrogen agent darolutamide in prostate cancer. HSD3B1 was overexpressed in darolutamide-resistant cells and induced by darolutamide treatment and AR knockdown. Inversely, HSD3B1 knockdown increased cellular sensitivity to darolutamide.

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Introduction: This study aimed to highlight the comprehensive differences in adverse events between abiraterone and enzalutamide based on a big data data set.

Methods: We downloaded adverse event data sets of abiraterone and enzalutamide from the Food and Drug Administration Adverse Event Reporting System database. We used the Medical Dictionary for Regulatory Activities to treat each adverse event as a preferred term and grouped it into the System Organ Class.

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Objective: The precise diagnosis of prostate cancer (PC) is crucial to avoid underdiagnosis, overdiagnosis, and overtreatment. We aimed to compare clinically significant PC (csPC) detection between MRI/ultrasound fusion-targeted prostate (TBx) compared to systematic biopsy (SBx) in biopsy-naïve Japanese men.

Methods: We included patients with suspect PC due to elevated PSA level or abnormal digital rectal examination, or both.

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Some oncoproteins along with stress kinase general control non-derepressible 2 (GCN2) can ensure the induction of activating transcription factor 4 (ATF4) to counteract amino acid deprivation; however, little is known regarding the role of the oncogenic EGFR-PI3K pathway. In this study, we demonstrate that both mutated EGFR and PIK3CA contribute to ATF4 induction following GCN2 activation in NSCLC cells. The inhibition of EGFR or PI3K mutant proteins, pharmacologically or through genetic knockdown, inhibited ATF4 induction without affecting GCN2 activation.

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