Yajing Zhang

Gunma University, Maebashi, Gunma Prefecture, Japan

Are you Yajing Zhang?

Claim your profile

Publications (5)15.11 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Carbon dioxide (CO2) insufflation has been shown to reduce the procedure-related pain and discomfort during colonoscopy. However, the effects of CO2 insufflation on the improvement of participant's stress had not been objectively analyzed. Using a randomized, double-blinded design, 100 consecutive patients undergoing colonoscopy were assigned to have their examination performed with either CO2 or air insufflation. Patients completed a questionnaire to grade their discomfort using a visual analogue scale (VAS). The salivary alpha-amylase (SAA) level was also measured at these times as a marker of stress. The total VAS score did not show any statistically significant differences between the CO2 and air insufflation groups. However, the VAS score for abdominal fullness significantly decreased in the CO2 insufflation group in comparison to the air insufflation group in the patients who had a longer examination. The titer of the maximum SAA was significantly increased by colonoscopy (P <0.01). CO2 insufflation significantly reduced the total SAA after the colonoscopy in comparison with air insufflation (P < 0.05). The examination time and SAA tended to have a positive relationship in the air insuflation group. However, no such relationship was observed in the CO2 insufflation group. CO2 insufflation significantly reduced the post-examination discomfort, as indicated by a salivary stress marker. The use of CO, rather than air insufflation reduced the patients' stress and may contribute to better acceptance of colonoscopy. The usefulness of CO2 insufflation was more prominent when a longer examination was necessary.
    No preview · Article · Jun 2013 · Acta gastro-enterologica Belgica
  • [Show abstract] [Hide abstract]
    ABSTRACT: Background and aim: The prevalence of functional gastrointestinal disorders (FGID) in adolescents and their relationship to quality of school life (QOSL) are not fully understood. This study investigated the relationship between FGID and QOSL. Methods: Adolescents (10-17 years) were recruited from 40 schools. FGID diagnoses were based on the Questionnaire on Pediatric Gastrointestinal Symptoms-Rome III version (QPGS-RIII). QOSL was evaluated by a questionnaire and calculated as the QOSL score. Results: Five hundred and fifty-two of the 3976 students (13.9%) met the FGID criteria for one or more diagnoses according to the QPGS-RIII: 12.3% met the criteria for one, 1.5% for two or more. Irritable bowel syndrome (IBS) was the most common diagnosis (5.9%) followed by functional abdominal pain (3.1%). The prevalence of FGID was significantly higher in the female students in comparison to male students (P < 0.01). The prevalence of FGID was 9.5% in elementary school, 15.4% in junior high school, 26.0% in high school students, respectively. The prevalence of FGID was significantly increased with age (P < 0.01). The QOSL score of the patients with FGID was 10.9 ± 4.5 and that without FGID was 8.2 ± 2.8, respectively. The QOSL score of the patients with FGID was significantly worse than those without FGID (P < 0.01). The QOSL scores with IBS, aerophagia, and cyclic vomiting syndrome were significantly worse among the FGID (P < 0.01). Conclusions: The prevalence of FGID in adolescents was relatively high. The presences of FGID worsen the QOSL score. Medical intervention and/or counseling are needed for such students to improve the QOSL.
    No preview · Article · Sep 2012 · Journal of Gastroenterology and Hepatology
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: To examine the efficacy of glycyrrhizin preparation (GL-p) in the treatment of a rat model of ulcerative colitis (UC). Experimental colitis was induced by oral administration of dextran sodium sulfate. Rats with colitis were intrarectally administered GL-p or saline. The extent of colitis was evaluated based on body weight gain, colon wet weight, and macroscopic damage score. The expression levels of pro-inflammatory cytokines and chemokines in the inflamed mucosa were measured by cytokine antibody array analysis. The effect of GL-p on myeloperoxidase (MPO) activity in the inflamed mucosa and purified enzyme was assayed. GL-p treatment significantly ameliorated the extent of colitis compared to sham treatment with saline. Cytokine antibody array analysis showed that GL-p treatment significantly decreased the expression levels of pro-inflammatory cytokines and chemokines, including interleukin (IL)-1β, IL-6, tumor necrosis factor-α, cytokine-induced neutrophil chemoattractant-2, and monocyte chemoattractant protein-1 in the inflamed mucosa. Furthermore, GL-p inhibited the oxidative activity of mucosal and purified MPO. GL-p enema has a therapeutic effect on experimental colitis in rats and may be useful in the treatment of UC.
    Full-text · Article · May 2011 · World Journal of Gastroenterology
  • [Show abstract] [Hide abstract]
    ABSTRACT: We investigated the therapeutic effect of polaprezinc (PZ), N-(3-aminopropionyl)-L-histidinato zinc, in rats with experimentally-induced colitis by focusing on calcineurin (CN) inhibition. CN plays a crucial role in T-cell activation and cytokine gene expression and is targeted by immunosuppressants such as cyclosporine and FK506. Colitis was induced into male Wistar rats by trinitrobenzene sulfonic acid and was treated with intrarectally administered PZ. The inflammation was assessed by the macroscopic damage score, colon wet weight, and proinflammatory mediator expression by RT-PCR analysis. Protein expression of calcineurin and the activation of its substrate, the nuclear factor of activated T cells (NFAT) transcription factor, were also studied. Calcineurin inhibition by PZ was investigated in in vitro experiments using colonic mucosa, purified calcineurin enzyme, and Jurkat T cells. CN was activated in the colitic mucosa; PZ treatment inhibited CN activation, the expression of proinflammatory cytokines in the mucosa, and thereby ameliorated the experimental colitis in rats. In in vitro experiments, PZ inhibited CN activity, NFAT activation, interleukin-2 expression, and the growth of Jurkat T cells. In the effective concentrations, PZ did not affect cell viability. Our results suggest that PZ can be used as an immunosuppressive agent for the treatment of colitis through its inhibitory effect on CN activity.
    No preview · Article · Feb 2011 · Life sciences
  • [Show abstract] [Hide abstract]
    ABSTRACT: The present study investigated the role of calcineurin (CaN) in the proliferation of human colorectal cancers. CaN activity and protein expression were increased in human colorectal cancers. Nuclear transcription factor NFAT, a physiological substrate for CaN, was activated in human colon cancer specimen as well as in the human colon cancer cell lines. CaN inhibitor cyclosporine A (CsA) reduced cell growth in these cell lines. CsA decreased the expressions of c-Myc and the proliferating cell nuclear antigen (PCNA) but also increased p21(WAF1/CIP1) expression. Our results suggest that CaN promotes colorectal cancer proliferation probably by regulating levels of c-Myc, p21(WAF1/CIP1), and PCNA.
    No preview · Article · Jun 2009 · Cancer letters