Publications by authors named "Rieko Nakata"

Background And Aim: Tofacitinib and aminosalicylic acid (5-ASA) are commonly used to treat ulcerative colitis (UC). However, evidence on the effect of concomitant 5-ASA use in patients receiving tofacitinib is limited. This study investigated the effects of 5-ASA combined with tofacitinib in UC patients.

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Urinary collagen peptides, the breakdown products of endogenous collagen, have been used as biomarkers for various diseases. These non-invasive biomarkers are easily measured via mass spectrometry, aiding in diagnostics and therapy effectiveness. The objective of this study was to investigate the effects of consuming collagen-containing meat on collagen peptide composition in human blood and urine.

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  • The study investigates the risk of developing active tuberculosis (TB) in patients with Crohn's disease (CD) who are treated with various biologic therapies, focusing on TNF-α inhibitors compared to other biologics like ustekinumab (UST) and vedolizumab (VDZ).
  • Researchers analyzed data from a large Japanese medical claims database, studying the association between biologic treatments and active TB occurrence across 28,811 patients, with a detailed assessment of treatment types and durations.
  • The results indicated that TNF-α inhibitors significantly increase the risk of active TB, with none of the patients treated with UST or VDZ developing the infection, highlighting the safety of these alternatives for CD patients.
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In this study, we investigated the biological profile of lectins isolated from raw and boiled Japanese red Kintoki beans (red kidney beans [RKB]; Phaseolus vulgaris). Lectins in beans showing agglutination activity were retained after heating. Raw and boiled RKB lectins were fractionated using carboxymethyl- and diethylaminoethyl-Sepharose, respectively.

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Background: Eosinophilic gastrointestinal disorders (EGIDs) are chronic allergic diseases categorized as eosinophilic esophagitis (EoE) and non-EoE EGIDs. Few studies regarding the association between EGIDs and coronavirus disease 2019 (COVID-19) have been reported. Although most Japanese individuals received the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) vaccine, the incidence of COVID-19 remained high in 2022.

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The coronavirus disease (COVID-19) pandemic has had a considerable impact on the global healthcare system and potentially the clinical course of patients with inflammatory bowel disease (IBD). Although IBD is a chronic disease, its therapy (except steroid therapy) does not increase the risk of contracting or aggravating COVID-19. However, the clinical course of patients is significantly influenced by environmental factors.

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The activation of peroxisome proliferator-activated receptor alpha (PPARα), a ligand-dependent transcription factor that regulates lipid oxidation-related genes, has been employed to treat hyperlipidemia. Emerging evidence indicates that Ppara gene expression decreases in adipose tissue under obese conditions; however, the underlying molecular mechanisms remain elusive. Here, we demonstrate that nitric oxide (NO) suppresses Ppara expression by regulating its promoter activity via suppression of specificity protein 1 (Sp1) transcriptional activity in adipocytes.

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  • Ustekinumab is effective for treating Crohn's disease, but many patients lose response within 2 years, prompting this study to evaluate its long-term efficacy and predictability.
  • The study included 59 patients and found that only 38.2% had a clinical response at week 8; factors linked to loss of efficacy included baseline disease severity and certain cytokine levels.
  • It was concluded that measuring serum MCP-1 levels and knowing a patient's biologic treatment history could help predict the effectiveness of ustekinumab over time.
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  • Choline helps the liver make important chemicals that are needed for health by providing methyl groups.
  • Scientists studied special proteins (PNPLA8 and PNPLA7) in mice that help break down a type of fat called phosphatidylcholine into another form called glycerophosphocholine, which helps in using choline properly.
  • Mice lacking these proteins showed problems like slower growth and less fat storage, showing how important these proteins are for keeping the liver healthy and managing fats in the body.
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  • Endoscopic mucosal healing is a key treatment target for ulcerative colitis (UC) patients, and the neutrophil-to-lymphocyte ratio (NLR) serves as a potential marker for predicting relapses.
  • A study conducted on 129 UC patients with low Mayo Endoscopic Subscores found that those with higher NLRs had a significantly lower relapse-free rate compared to those with lower NLRs over a follow-up period of about 46 months.
  • The findings suggest that the NLR can be a valuable tool in clinical settings for identifying patients at risk of relapse and guiding treatment strategies.
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Background: Autonomic dysfunction is a factor in irritable bowel syndrome (IBS). However, there are no reports of autonomic nervous system (ANS) activity during natural defecation in patients with IBS. We aimed to clarify the relationship between ANS activity and life events, such as defecation and abdominal symptoms, using real-time recording.

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A total of 306 patients with eosinophilic esophagitis (EoE) were analyzed at our department. Proton pump inhibitors or potassium-competitive acid blockers were used as the first-line treatment in 286 (93.5%) patients.

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Objective To examine the effect of the coronavirus disease 2019 (COVID-19) lockdown on lifestyle factors and psychological stress in patients with inflammatory bowel disease (IBD). Methods A retrospective study was conducted on patients with IBD in Japan 2 months after the initiation of the first state of emergency (June 16 to August 21, 2020). A self-reported questionnaire was used to collect data, and lifestyle factors and psychological stress levels before and after the state of emergency were compared.

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Coronavirus disease 2019 (COVID-19) vaccination is recommended for patients with inflammatory bowel disease (IBD). However, the acceptance of COVID-19 vaccines has not been sufficiently evaluated in patients with IBD. We aimed to assess the acceptance and hesitancy of COVID-19 vaccination and related factors among these patients.

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The government of Japan declared a state of emergency on April 16, 2020, owing to the coronavirus disease 2019 (COVID-19) pandemic. The subsequent lockdown altered lifestyles and worsened mental illnesses. Inflammatory bowel disease (IBD) is an intestinal disorder that is affected by environmental factors.

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Staphylococcus schleiferi has rarely been reported to cause pyogenic spondylitis. A 42-year-old man had been treated for Crohn's disease with immunosuppressive agents and home parenteral nutrition via a central vein (CV) port. The patient was admitted to our hospital, presenting with neck pain and a fever.

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Background: Skipping breakfast is associated with dysmenorrhea in young women. This suggests that the delay of food intake in the active phase impairs uterine functions by interfering with circadian rhythms.

Objectives: To examine the relation between the delay of feeding and uterine circadian rhythms, we investigated the effects of the first meal occasion in the active phase on the uterine clock.

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Objectives: Pouchitis is a major complication after restorative proctocolectomy with ileal pouch-anal anastomosis (IPAA) in patients with ulcerative colitis (UC). Although there have been many investigations of the neutrophil-to-lymphocyte ratio (NLR) in various diseases, its role in predicting the development of pouchitis remains unclear. We aimed to evaluate the clinical utility of the NLR for predicting the development of pouchitis after IPAA in UC patients.

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Background: Supragastric belching (SGB) may play a role in the pathophysiology of proton pump inhibitors (PPIs)-refractoriness in gastroesophageal reflux disease (GERD). SGB may be present in up to 40% of reflux symptoms in PPI-refractory GERD. Most reports on SGB have come from Western countries, and little is known about the prevalence and relevance of SGB in Asian refractory GERD patients.

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There are growing concerns that poor dietary behaviors at young ages will increase the future risk of chronic diseases in adulthood. We found that female college students who skipped breakfast had higher incidences of dysmenorrhea and irregular menstruation, suggesting that meal skipping affects ovarian and uterine functions. Since dysmenorrhea is more prevalent in those with a past history of dieting, we proposed a novel concept that inadequate dietary habits in adolescence become a trigger for the subsequent development of organic gynecologic diseases.

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Loss-of-function mutations in the solute carrier organic anion transporter family, member 2a1 gene (SLCO2A1), which encodes a prostaglandin (PG) transporter, have been identified as causes of chronic nonspecific multiple ulcers in the small intestine; however, the underlying mechanisms have not been revealed. We, therefore, evaluated the effects of systemic knockout of Slco2a1 (Slco2a1) and conditional knockout in intestinal epithelial cells (Slco2a1) and macrophages (Slco2a1) in mice with dextran sodium sulphate (DSS)-induced acute colitis. Slco2a mice were more susceptible to DSS-induced colitis than wild-type (WT) mice, but did not spontaneously develop enteritis or colitis.

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  • Helicobacter pylori is linked to gastric cancer, and this study aimed to determine if eradicating it could prevent further cancer development in early gastric cancer (EGC) patients post-endoscopic resection.
  • The study involved 770 EGC patients and compared the incidence of metachronous gastric cancer (MGC) between those who eliminated H. pylori and those who did not.
  • Results showed a significantly lower 5-year incidence of MGC in the eradicated group (3.9%) compared to the persistent group (13.2%), indicating that successful H. pylori eradication can help prevent MGC after endoscopic treatment.
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Background: We previously reported that skipping breakfast is associated with menstrual disorders of female college students during postadolescent maturation.

Objective: In this study, we investigated the effects of meal timing during circadian cycle on the ovarian function using young female rats.

Methods: Considering that rats are nocturnally active, 8-wk-old female Wistar rats were classified into 3 groups: fed during the daytime only (nonactive phase), night-time only (active phase), or control group I (without time or calorie restriction, free access to a standard caloric diet, 20.

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Scope: Peroxisome proliferator-activated receptor alpha (PPAR-α) is a ligand-activated transcription factor that regulates lipid and carbohydrate metabolism. We investigate the effects of naturally occurring PPAR-α agonists, phytol, and its metabolite phytanic acid, on obesity-induced metabolic disorders using a mouse model.

Methods And Results: A luciferase reporter assay shows that phytanic acid potently activates PPAR-α among PPAR subtypes.

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