Luat Nguyen | PubMed Health

PubMed2006

A survey of irritable bowel syndrome in Vietnam using the Rome criteria.

Prevalence estimates for irritable bowel syndrome from surveys in Western countries are 4.4% to 22%, generally higher in women than men, and only a minority seek health care. There are few studies of bowel patterns in Asian countries. We conducted a survey of a nonpatient population in Ho Chi Minh City, Vietnam, to determine bowel patterns and the prevalence of bowel dysfunction. A forced-choice, self-report questionnaire was distributed to 738 predominantly health care workers, as well as patient relatives, at Cho Ray Hospital in Ho Chi Minh City and returned by 411 (response rate of 55.7%). Results were analyzed for men and women using Student's t-test for continuous variables and chi-square test for categorical variables. Subjects were 53.6% female, with a mean age of 27.7+/-6.9 years. Overall perception of health was excellent/very good in 13.6%, good in 54.2%, and fair/poor in 32.1% (males, 17.1%, 51.3%, and 31.5%, vs. females, 10.6%, 56.7%, and 32.7%; P=NS). The mean number of stools reported per week was 6.5 (males, 6.6, vs. females, 6.4; P=NS) and ranged between 3 and 21 stools per week in 95.5%. The frequency of irritable bowel syndrome symptoms (using Rome I criteria) was 7.2% (95% CI=4.8-10.1), with males at 4.8% (95% CI=2.2-8.9) vs. females at 9.2% (95% CI=5.7-13.9) (P=0.08). Of the subjects with irritable bowel syndrome symptoms, 6 of 29 (20.7%) had seen a physician for bowel symptoms. There were no gender differences in reported infrequent stool (12.0%), frequent stool (11.3%), hard stool (17.5%), loose stool (6.5%), straining (14.5%), incomplete emptying (16.2%), bloating (15.0%), urgency (10.0%), or mucus (2.7%). In conclusion, this survey of a nonpatient population in Vietnam showed that irritable bowel syndrome symptoms as defined by Rome criteria were common and that there were no significant differences between sexes in either stool frequency or prevalence of irritable bowel syndrome, unlike previous studies from the United States. The prevalence of irritable bowel syndrome in Vietnam in this study was in the lower range of reported data from Western countries, possibly in part related to the use of the Rome criteria. Only a minority of subjects with irritable bowel syndrome symptoms reported seeking health care for these symptoms.

Adolescent↗

PubMed2005

Cell membrane array fabrication and assay technology.

BACKGROUND: Microarray technology has been used extensively over the past 10 years for assessing gene expression, and has facilitated precise genetic profiling of everything from tumors to small molecule drugs. By contrast, arraying cell membranes in a manner which preserves their ability to mediate biochemical processes has been considerably more difficult. RESULTS: In this article, we describe a novel technology for generating cell membrane microarrays for performing high throughput biology. Our robotically-arrayed supported membranes are physiologically fluid, a critical property which differentiates this technology from other previous membrane systems and makes it useful for studying cellular processes on an industrialized scale. Membrane array elements consist of a solid substrate, above which resides a fluid supported lipid bilayer containing biologically-active molecules of interest. Incorporation of transmembrane proteins into the arrayed membranes enables the study of ligand/receptor binding, as well as interactions with live intact cells. The fluidity of these molecules in the planar lipid bilayer facilitates dimerization and other higher order interactions necessary for biological signaling events. In order to demonstrate the utility of our fluid membrane array technology to ligand/receptor studies, we investigated the multivalent binding of the cholera toxin B-subunit (CTB) to the membrane ganglioside GM1. We have also displayed a number of bona fide drug targets, including bacterial endotoxin (also referred to as lipopolysaccharide (LPS)) and membrane proteins important in T cell activation. CONCLUSION: We have demonstrated the applicability of our fluid cell membrane array technology to both academic research applications and industrial drug discovery. Our technology facilitates the study of ligand/receptor interactions and cell-cell signaling, providing rich qualitative and quantitative information.

Animals↗