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Makoto Kurihara

Publications and source records attributed to Makoto Kurihara.

8 recordsLinked to original sources
PubMed2006

Quantitative determination of gland mucous cells-type mucin using a monoclonal antibody, HIK1083: its pathophysiological changes in human gastric juice.

BACKGROUND: Pathological alteration in gastric mucosa is caused by Helicobacter pylori infection and is detectable by histological analysis. In particular, the alteration of gland mucous cells (GMCs)-type mucin, which plays a protective role against H. pylori infection, is critical in the pathogenesis of H. pylori-related gastritis. We established an assay for GMCs-type mucin and quantitatively assessed the pathophysiological changes in its content in human gastric juice samples. METHODS: The assay method for GMCs-type mucin was based on ELISA using a monoclonal antibody (HIK1083), and was used it to measure GMCs-type mucin in gastric juice obtained from patients with or without H. pylori infection. RESULTS: All the basic characteristics of the current method were satisfactory to quantify the GMCs-type mucin content in gastric juice. The GMCs-type mucin content, but not total mucin content, was significantly higher in patients with H. pylori infection (n=17; 437+/-476 U, mean+/-SD) than in those without H. pylori infection (n=55; 168+/-322 U, p<0.05). CONCLUSIONS: The current method is suitable for the quantitative analysis of GMCs-type mucin in gastric juice. The change in GMCs-type mucin content in gastric juice may be possibly implicated in the pathophysiology of the gastric mucosa and in the patient's gastric mucosal lesions.

Animals↗
PubMed2006

Nocturnal enuresis and overactive bladder in children: an epidemiological study.

AIMS: To investigate the prevalence and characteristics of nocturnal enuresis (NE) and to examine the prevalence of overactive bladder (OAB) symptoms in primary schoolchildren. METHODS: After conducting an anonymous questionnaire survey about voiding habits and bowel habits in primary schoolchildren, a total of 6917 schoolchildren belonging to 11 primary schools were randomly enrolled in the survey. According to the International Continence Society, we defined NE as any involuntary loss of urine during sleep, occurring more frequently than once per month. Children with NE were subdivided into two groups, monosymptomatic NE (MNE) and enuretic syndrome (ES). To evaluate the characteristic differences of MNE and ES, we assessed the relationships between NE and voiding habits, and episodes of cystitis and constipation. Overactive bladder was defined as increased daytime frequency and/or urge urinary incontinence, and its prevalence was investigated. RESULTS: The response rate to the questionnaire was 76.4%. The prevalence of NE was 5.9% and was inversely related to increasing age. Monosymptomatic NE comprised 59.4% of NE cases. The annual spontaneous resolution rate of MNE was higher than that of ES. Increased daytime frequency, a history of cystitis and infrequent bowel habits were not related to MNE, but were significantly related to ES. The prevalence of OAB was 17.8%. Children with a history of cystitis had a significantly higher rate of OAB than children without it. CONCLUSIONS: Overall, NE and OAB were detected in 5.9% and 17.8% of primary schoolchildren, respectively. The link between NE and OAB symptoms, urinary tract infections and constipation deserves more attention.

Child↗
PubMed2004

Lack of the complete circular rhabdosphincter and a distinct circular smooth muscle layer around the proximal urethra in elderly Japanese women: an anatomical study.

Histological observations of semiserial sections obtained from the cadavers of 30 elderly Japanese women (aged 61-93 years) found that the urethral rhabdosphincter (URS) usually occurred as a ventrally localized structure instead of exhibiting the normal completely circular configuration. The superoinferior length, thickness and muscle fiber density of the URS area showed significant interindividual variation. A thick fascicle, extending posterolaterally from the URS and radiating to the lateral vaginal wall and other perineal tissues, was usually observed. A circular smooth muscle layer, which immediately surrounded the longitudinal smooth muscle layer, was consistently present in the proximal urethral but not in the bladder neck. These findings suggest that voluntary sphincteric action is weak or incomplete in elderly Japanese women. We therefore hypothesize that upward retraction of the midurethra by the URS, compression of the distal urethra by its posterolateral extensions, and tonus provided by the outer circular smooth muscle layer all contribute to maintaining continence in these women.

Aged↗
PubMed2004

Appearance of specific mucins recognized by monoclonal antibodies in rat gastric mucosa healing from HCl-induced gastric mucosal damage.

BACKGROUND: Mucus is an important factor in the physiological defense mechanism of the gastrointestinal tract. We have reported that two distinct antigenicities reacting with anti-mucin monoclonal antibodies (mAbs), HCM31 and RGM26, emerged in epithelial cells regenerating from acetic acid-induced gastric damage in the rat. Here, we examined whether the expression of specific mucins occurred during the healing stage of acute gastric mucosal lesions, and what was the principal alteration of the mucus in the regenerating process of gastric epithelia from slight mucosal lesions. METHODS: Eight-week-old male Wistar rats were used. The animals were administered 0.6 N hydrochloric acid, or 0.5% carboxymethyl cellulose sodium salt into their stomachs. Twenty-four, 48, and 72 h after the HCl administration, their stomachs were removed. Immunohistochemical observation was performed after staining with the mAbs, RGM21, RGM26, HIK1083, or HCM31. RESULTS: Twenty-four hours after the administration of HCl, mucous cells stained with RGM26 emerged in the deeper area of the surface epithelial cells in the damaged corpus mucosa. After 48 h, HCM31-positive cells were noted in the epithelial cells where the mucosal damage reached more deeply. CONCLUSIONS: The appearance of specific mucin species was observed in the regenerating epithelia of the rat during the healing process from acute gastric mucosal damage.

Animals↗
PubMed2004

The micturition habits and prevalence of daytime urinary incontinence in Japanese primary school children.

PURPOSE: We assessed the prevalence of daytime urinary incontinence (DUI) and the daytime frequency of voiding by age and sex in neurologically normal children in primary school. We also investigated the association of DUI with background factors. MATERIALS AND METHODS: We performed an anonymous questionnaire survey of DUI in primary school children. A total of 11 primary schools in Hiroshima City were randomly selected and 6,917 school children 7 to 12 years old were enrolled. DUI was defined as any involuntary leakage of urine during the daytime occurring more frequently than once monthly in the 6 months before the survey. Slight dampness of the child underwear was also regarded as DUI. RESULTS: The overall response rate was 76.4% of 6,917 school children. The prevalence of DUI was 6.3% and it was inversely related to age, decreasing from about 9% at age 7 to 2% at age 12 years. Children urinated about 5 or 6 times daily and increased daytime frequency occurred in 14.6% of all children. Daytime frequency of voids, history of cystitis and infrequent bowel habits had a statistically significant positive correlation with DUI. CONCLUSIONS: We found that the overall prevalence of DUI in primary school children was 6.3%, gradually decreasing with age. Increased daytime frequency, history of cystitis and infrequent bowel habits were significantly related to DUI. The link between DUI and daytime frequency, urinary tract infections and constipation deserves more attention.

Child↗
PubMed2003

Characterization of rat gastric mucins using a monoclonal antibody, RGM23, recognizing surface mucous cell-type mucins.

A novel anti-mucin monoclonal antibody (mAb), designated RGM23, was developed against mucin purified from rat gastric mucosa. RGM23 reacted with the mucin attached to the ELISA well. The reactivity was lost by trypsin treatment, but not by periodate oxidation, indicating that RGM23 recognizes the peptide moiety of the mucin molecule. Histochemical study showed that RGM23 stained the corpus and antral surface mucosa of rat stomach, but not their glandular mucosa, nor duodenal, small intestinal or large intestinal mucosa. The area stained with RGM23 was coincident with that stained with 45M1, a mAb reacting with MUC5AC mucin. Examination of the mucin subunits extracted from rat stomach by Sepharose CL-4B and Q-Sepharose chromatography and CsTFA equilibrium centrifugation showed that RGM23 reacted with the surface mucous cell-type mucins that were stained with periodate-Schiff (PAS) and reacted with mAb RGM21. The gastric gland-type mucin, which reacted with mAb HIK1083, did not react with RGM23. On Q-Sepharose chromatography, a part of the RGM21-reactive mucins was only faintly stained with PAS and did not react with RGM23. The results together indicated that RGM23 probably reacted with the rat MUC5AC (rMuc5AC) mucin present in the surface mucosa of the stomach, and that the surface mucosal cells in rat stomach may contain mucin bearing non-rMuc5AC core protein in addition to rMuc5AC mucins.

Animals↗
PubMed2003

[A rapid determination kit for acetaminophen].

Acetaminophen (APAP: N-Acetyl-p-amino-phenol) is widely used as a nonprescription analgesic and antipyretic drug. Although APAP is usually well tolerated when used at the recommended dose, overdose has been associated with lethal hepatic necrosis. This toxicity has been correlated with elevated serum or plasma APAP levels and/or a halftime of elimination from these fluids exceeding four hours. Therefore a rapid method for determination of APAP is needed to treat a patient with an acute APAP overdose. We developed a simple and rapid method for determination of APAP and prepared a test kit. The test kit was based on the colorimetric method (indophenol method), but not including stinking reagents. The reaction mixture assumed pale blue to dark blue according to APAP concentrations and the determination range was 10-200 micrograms/mL with the naked eye. It took only 15 minutes for this test. In addition, the test kit could be adapted to APAP test in urine. We believe that the new APAP determination kit will be a useful tool for emergency diagnosis.

Acetaminophen↗