Publications by authors named "Satoru Inoguchi"

Article Synopsis
  • Bladder cancer (BC) is a serious condition with high rates of mortality and limited treatment options, prompting research into cellular mechanisms for potential breakthroughs.
  • The study focused on the long non-coding RNA (lncRNA) brain cytoplasmic RNA 1, finding that its downregulation in BC cells hindered their growth, movement, and ability to form clusters while promoting cell death.
  • Serum exosomal levels of this lncRNA were significantly higher in BC patients compared to healthy individuals, suggesting it could serve as a valuable diagnostic marker and therapeutic target.
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  • * Studies revealed that gemcitabine-resistant cells have higher levels of phosphoglycerate dehydrogenase (PHGDH) and altered metabolic pathways, which enhance survival and growth despite treatment.
  • * Targeting PHGDH and combining a specific tyrosine kinase inhibitor with other treatments showed promising results in reducing tumor growth and promoting cell death in resistant bladder cancer cells in laboratory tests.
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Background: Kidney transplant recipients (KTRs) are at risk of severe coronavirus disease 2019 (COVID-19), and even now that Omicron subvariants have become dominant, cases of severe disease are certain to occur. The aims of this retrospective study were to evaluate the efficacy of antiviral treatment for COVID-19 and to identify risk factors for severe disease in KTRs during Omicron subvariant-dominant periods.

Methods: A total of 65 KTRs diagnosed with COVID-19 who received antiviral treatment between July 2022 and September 2023 were analyzed.

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  • Multitargeted receptor tyrosine kinase inhibitors like sunitinib are commonly used to treat advanced renal cell carcinoma (RCC), but many patients develop resistance to this treatment.
  • Research has identified that increased expression of secretogranin II (SCG2) in sunitinib-resistant RCC cells may play a role in this resistance and is linked to poorer survival rates.
  • Further investigations revealed that reducing SCG2 levels inhibited cell migration and angiogenesis, indicating that SCG2 may influence sunitinib resistance by affecting the VEGF signaling pathway in RCC cells.
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Combination chemotherapy with gemcitabine and cisplatin (GC) is recommended as the primary treatment for advanced bladder cancer (BC). However, the benefits of this approach are limited owing to the acquisition of drug resistance. Here, we found that gemcitabine-resistant and cisplatin-resistant BCs do not exhibit cross-resistance, and that these BCs exhibit different mRNA patterns, as revealed using RNA sequence analysis.

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  • * Researchers developed a method to isolate exosomes from cell samples and found that miR-1 in these exosomes can inhibit RCC cell growth, migration, and invasion, while lower levels of miR-1 were linked to worse patient outcomes.
  • * Additionally, the study identified MYO15A, a gene whose high expression correlates with poor RCC prognosis, as a potential tumor marker, with its levels increased in RCC patients compared to healthy individuals.
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Objectives: We analyzed the clinical outcomes of laparoscopic adrenalectomy for pheochromocytomas in hemodialysis compared with nonhemodialysis patients.

Methods: Fifty-seven patients (7 hemodialysis and 50 nonhemodialysis) were included in the study. We analyzed the differences in clinical parameters and outcomes between the hemodialysis patient groups and nonhemodialysis patient groups as well as identified predictors for an intraoperative hypertensive spike.

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  • Cancer metabolism, especially glutamine metabolism via SLC1A5, is gaining attention as a therapeutic target, with SLC1A5 linked to enhanced cancer cell growth.
  • In clear cell renal cell carcinoma (ccRCC), SLC1A5 expression correlates with poor survival, highlighting its role as a prognostic factor.
  • Inhibiting SLC1A5 using siRNAs or the V9302 inhibitor reduces ccRCC tumor growth and invasion, and these effects are associated with cellular senescence, potentially guiding new treatment strategies.
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Purpose: To evaluate the treatment outcomes and postoperative complications associated with the systematic multi-site hydrodistention implantation technique (SMHIT) for primary vesicoureteral reflux (VUR) and to determine its mid-term efficacy and safety.

Patients And Methods: We retrospectively reviewed the data for 17 ureters from 12 consecutive children, aged ≥1 year, with grade II-IV reflux and a history of febrile urinary tract infections (FUTI), who underwent a single-session of SMHIT. The primary outcome was the absence of postoperative FUTI (clinical success).

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Objective: To determine the long-term safety and efficacy of ureteric reimplantation with psoas bladder hitch (PBH) in patients aged <12 months with unilateral obstructive megaureter (OM).

Patients And Methods: We retrospectively compared a group of patients aged <12 months (study group) with an group of patients aged ≥12 months (comparison group), who underwent PBH for OM between September 2007 and April 2017, in terms of preoperative patient characteristics, intra- and peri-operative results, and postoperative results.

Results: The study group comprised seven infants, five boys and two girls.

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In microRNA (miRNA) biogenesis, the guide-strand of miRNA integrates into the RNA induced silencing complex (RISC), whereas the passenger-strand is inactivated through degradation. Analysis of our miRNA expression signature of bladder cancer (BC) by deep-sequencing revealed that microRNA (miR)-145-5p (guide-strand) and miR-145-3p (passenger-strand) were significantly downregulated in BC tissues. It is well known that miR-145-5p functions as a tumor suppressor in several types of cancer.

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Here, we found that members of the microRNA-29 family (miR-29a/b/c; "miR-29s") were significantly reduced in clear cell renal cell carcinoma (ccRCC) tissues, suggesting that they functioned as tumour suppressors. Restoration of all mature members of the miR-29 family inhibited cancer cell proliferation, migration and invasion. LOXL2 was a direct target gene of miR-29s, as shown by genome-wide gene expression analysis and luciferase reporter assay.

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Recent clinical trials of chemotherapeutics for advanced bladder cancer (BC) have shown limited benefits. Therefore, new prognostic markers and more effective treatment strategies are required. One approach to achieve these goals is through the analysis of RNA networks.

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Purpose: We observed abnormal expression of the microRNA-23b/27b (miR-23b/27b) cluster in our previous study of miRNA expression signatures. However, the relationship between aberrant miRNA expression and clear cell renal cell carcinoma is not well established. We investigated the functional significance of the miR-23b/27b cluster in clear cell renal cell carcinoma cells and evaluated these miRNAs as biomarkers to predict the risk of clear cell renal cell carcinoma.

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Here, we found that microRNA-24-1 (miR-24-1) is significantly reduced in bladder cancer (BC) tissues, suggesting that it functions as a tumour suppressor. Restoration of mature miR-24-1 inhibits cancer cell proliferation and induces apoptosis. Forkhead box protein M1 (FOXM1) is a direct target gene of miR-24-1, as shown by genome-wide gene expression analysis and luciferase reporter assay.

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Our recent study of the microRNA expression signature of prostate cancer (PCa) revealed that microRNA-224 (miR-224) is significantly downregulated in PCa tissues. Here, we found that restoration of miR-224 significantly inhibits PCa cell migration and invasion. Additionally, we found that oncogenic TPD52 is a direct target of miR-224 regulation.

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