Search PubMed⌕ Search

Biomedical subjects

J P Lepargneur

Publications and source records attributed to J P Lepargneur.

13 recordsLinked to original sources
PubMed2005

Prebiotic effects of oligosaccharides on selected vaginal lactobacilli and pathogenic microorganisms.

The purpose of this study was to select endogenous human vaginal lactobacilli strains on the basis of the main probiotic properties observed in the vaginal environment in order to use them for the evaluation of the potential prebiotic properties of oligosaccharides. From vaginal samples of 50 women with a normal flora, 17 lactobacilli strains were first isolated because of their high level of hydrogen peroxide production. Then six strains were selected mainly for their ability (i) to adhere to vaginal cells, (ii) to produce compounds in sufficient amount, such as lactic acid, having an inhibitory action on pathogens, and less importantly, (iii) to demonstrate arginine deiminase activity. These six strains were found to belong to three distinct species: Lactobacillus crispatus, L. jensenii and L. vaginalis. One strain of each species was chosen as a potential vaginal probiotic strain with regard to our criteria. These three strains were then used to evaluate the prebiotic properties of different oligosaccharide series: two fructooligosaccharide series (FOS Actilight and FOS Raftilose) and two glucooligosaccharide series varying by their osidic linkages (alpha-1,6/alpha-1,4 GOS and alpha-1,2/alpha-1,6/alpha-1,4 GOS). The test was based on the ability of the oligosaccharides to promote the growth of the three beneficial strains selected but not of pathogenic microorganisms often encountered in urogenital infections such as Candida albicans, Escherichia coli and Gardnerella vaginalis. Oligosaccharide hydrolysis was followed by HPLC analysis. This revealed that two oligosaccharide series (FOS Actilight DP3 and all alpha-1,6/alpha-1,4 GOS DP > or = 4) were used only by the lactobacilli strains, the pathogenic microorganisms being unable to metabolise them. The selected lactobacilli and oligosaccharides are good candidates for incorporation in a formula to prevent vaginal infections.

Journal Article↗
PubMed2004

[Genital infections in women, in community practice. Comparison of two studies, 1987 and 2002].

One thousand eight hundred and thirty-six clinical and biological cervico-vaginal flora samples from genital infections in women observed in community practice in 1987 were compared to 368 samples collected in 2001. The diagnosis of sexually transmitted infection (STI) was rarely made. Nonetheless, examining these samples made it possible either to prescribe a specific treatment for a confirmed infection (chlamydia, trichonomiasis, candidiasis, gonococci, vaginosis), or to modify a long-term treatment that was often ineffective and sometimes badly tolerated. Not all vulvar itching, associated or not with pelvic pain, is caused by mycosis. Treatment based on a syndromic approach was often ineffective, because clinical symptoms, whether isolated or associated, even when they were suggestive of an etiology, presented only a minor positive predictive value (the PPV for the association ichting + pelvic pain was only 10% for chlamydia, but 45% for candidiasis). The diagnosis of vaginosis, suggested for the past 10 years as an improvement in the diagnosis of vulvo-vaginitis, was made in only 13% of the cases. The only significant difference in our two studies was a lower number of cases of gonococci, chlamydiae, and ureaplasms in 2001, the settings having remained identical, except for a lower number of patients in 2001.

Adolescent↗
PubMed2002

[Protective role of the Doderleïn flora].

The vaginal flora of a healthy woman is composed of the Doderleïn bacilli (different species of lactobacilli) forming a biofilm on the mucosa. These bacteria have a beneficial effect by inhibiting growth, adhesion or spread of other microorganisms. Different mechanisms are recognized, including secretion of organic acids, production of antimicrobial substances (hydrogen peroxide, bacteriocins and biosurfactants), competition for nutrients (arginine deiminase), competition for receptors (adhesion on the epithelium), steric exclusion (biosurfactants, adhesion on the epithelium or on the fibronectin) and co-aggregation. This ecological balance can be disturbed by drugs (antibiotics and spermicides) or by local devices. A new therapeutic approach has been proposed to restore a normal flora: the use of probiotics by the association of different lactobacilli with combined antimicrobial activity.

Anti-Bacterial Agents↗
PubMed1999

[Urinary tract infection in an urban population: etiology and antibiotic sensitivity as a function of patient history].

OBJECTIVE: The aim of this study was to explore the relationship between etiological factors, bacterial isolates and Escherichia coli susceptibility to antibiotics in ambulatory patients with urinary tract infection. PATIENTS AND METHODS: A prospective study was conducted in 13 private medical laboratories in France in March 1998. Data were collected on 658 cases involving 679 strains in ambulatory patients with urinary tract infections. Data on age, gender, catheter insertion within the 7 preceding days, and history of hospitalization, urinary infection and antibiotic treatment during the 6 preceding months were recorded. The distribution of the bacterial isolates and Eschericha coli sensitivity to ciprofloxacin, cotrimoxazole, and gentamycin were studied. RESULTS: E. coli was most frequently isolated in women, in patients with no catheter or without a history of antibiotic treatment, hospitalization or urinary infection. There was no difference in E. coli sensitivity according to sex and age in women. In patients with prior antibiotic treatment, all the tested antibiotics except gentamycin were significantly less active. In case of prior hospitalization, the E. coli isolates were more resistant to amoxicillin, quinolones, cotrimoxazole and gentamycin. The level of E. coli suceptibility rose as the delay since hospitalization or urinary infection increased. CONCLUSION: Ambulatory patients comprise a heterogeneous population requiring particular attention to correctly adapt therapeutic strategies.

Adolescent↗
PubMed1997

Tetracycline-resistant Chlamydia trachomatis in Toulouse, France.

We report the first isolation of a tetracycline-resistant Chlamydia trachomatis strain in Toulouse, France. Culture of a post treatment endocervical specimen from a woman treated with tetracycline grew C. trachomatis. The patient was retreated with pristinamycin and cured. The minimal inhibitory concentration (MIC) and the minimal bactericidal concentration (MBC) of tetracycline for the patient isolate were > 64 micrograms/ml although 1% of the population of organisms showed resistance. Conversely for 34 C. trachomatis isolates recovered since 1988 from patients before treatment, in Toulouse, all the MICs of tetracycline were < or = 0.25 microgram/ml. If the isolation of tetracycline-resistant C. trachomatis was the result of persisting organisms, the management of chlamydial infections could be changed.

Chlamydia trachomatis↗
PubMed1989

[Frequency of germ isolation from urinary infections in community practice; their sensitivity to 7 antibiotics including a combination of amoxicillin and clavulanic acid. Evaluation on 1611 samples].

A multicenter study including 10 outpatient private laboratories (hospital laboratories excluded) was carried out in France. 1,611 urines samples from patients with UTI were collected during the forth trimester of 1987. The most frequently recovered pathogens were: E. coli (71%), Proteus mirabilis (9%), Staphylococcus coagulase (6%), Klebsiella (6%), Enterobacter (2%). Other sorts (Streptococcus D, Proteus sp, Pseudomonas aeruginosa, Enterobacter sp) were infrequent (less than 1%). The sensitivity of the aerobic Gram-negative bacteria to ampicillin, clavulanic acid-amoxicillin, cephalothin, gentamicin, pipemidic acid, norfloxacin and co-trimoxazole was tested.

Adult↗
PubMed1988

[Comparative study of two methods of determining plasma and salivary theophylline].

A new method for theophylline assay (Aris method), uses an immuno enzyme assay on a solid-phase (strips). We compared it to a HPLC method for 33 plasma samples and 85 saliva samples in children and adults. The correlation-coefficient between the two methods is highly significant (r = 0.976 for plasma samples and r = 0.99 for saliva samples) although we found a significant difference: the average difference is 0.789 microgram/ml for plasmatic levels and 0.55 microgram/ml for saliva levels. The values are rather low and remain widely satisfactory for posology adaptations. The reproducibility of the Aris method is similar to the HPLC method. Its sensitivity is quite satisfactory and can be improved. Yet the good correlations we obtained for plasma as well as for saliva, the rapidity, simplicity, specificity and low cost of this new technique should make the theophylline estimation easier in hospitals and laboratories.

Chromatography, Liquid↗
PubMed1986

Noninvasive and quantitative 19F nuclear magnetic resonance study of flucytosine metabolism in Candida strains.

19F nuclear magnetic resonance was used for a noninvasive and quantitative study of flucytosine (FC; 5-fluorocytosine) metabolism in two strains of Candida albicans and one strain of Candida tropicalis with various susceptibilities to FC. Three intracellular fluorinated metabolites were detected in the highly susceptible strain, F-nucleotides (Fnt), F-nucleosides, and 5-fluorouracil (5FU). Fnt were partially converted into 5FU when the spectra of the yeasts were recorded at 37 degrees C without perfusion, but the intensities of the signals were not modified at 4 or 37 degrees C if the cells were perfused. In the acid extract, the Fnt signal was resolved into three distinct peaks; none of them was attributable to 5-fluoro-2'-deoxyuridine-5'-monophosphate. The same signals were detected in the partially resistant strain, but only 5FU was observed in the highly resistant strain; the resistance of the latter strain therefore was primarily due to a defect in UMP pyrophosphorylase. At the end of the incubation period, only FC and released 5FU were present in the culture media. The concentration of the intracellular fluorinated metabolites was increased if the strain was susceptible to FC. The total amount of metabolized FC was very similar for the highly susceptible and the partially resistant strains, but the percentage of Fnt was much higher in the former (38%) than in the latter (8%); the mild resistance of the partially resistant strain therefore was attributed to the decreased activity of UMP pyrophosphorylase.

Candida↗
PubMedDate not supplied

Clinical and microbiologic features of urethritis in men in Toulouse, France.

On hundred twenty-six men who attended a hospital microbiology laboratory and 99 men who attended a private laboratory in Toulouse, France, for symptoms of urethritis were examined during 1988, for evidence of urethral pathogens. The following incidences were found: Neisseria gonorrhoeae: 24 (10.7%); Chlamydia trachomatis: 58 (25.8%); Ureaplasma urealyticum: 46 (20.4%); Gardnerella vaginalis: 21 (9.3%); Haemophilus parainfluenzae: 21 (9.3%); Streptococcus agalactiae: 15 (6.7%); Candida albicans: 10 (4.4%); and Trichomonas vaginalis: 4 (1.8%). The prevalence of these microorganisms was similar in the two groups of patients. No pathogen was isolated from 71 patients (31.6%). Mixed infections with at least two pathogens were found in 49 men (21.8%). Another goal of this study was to determine the relative prevalence of urethral pathogens in relation to clinical findings. N. gonorrhoeae was isolated significantly more often in patients who had a urethral discharge (P less than .05) that contained five or more polymorphonuclear cells per high-power field (PMN/HPF) (P less than .001). G. vaginalis was isolated significantly more often in patients who did not have an urethral discharge (P less than .05) and in men with less than five PMN/HPF (P less than .05). Isolation of C. albicans was significantly associated with pruritus (P less than .05) and balanitis (P less than .001). Like the clinical features, the gram-stained urethral smear was of limited value in diagnosis and therapeutic decision-making regarding non-gonococcal urethritis. In contrast, this study underlines the importance of full identification of urethral isolates in the management of urethritis in men.

Adult↗