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Trans fatty acids promote the growth of some Lactobacillus strains.

Five Lactobacillus strains (2 L. gasseri, 2 L. plantarum and 1 L. reuteri) were cultured in modified MRS medium containing fatty acids (FAs) instead of Tween 80 for 24 h at 37 degrees C, to learn the effect of saturated and unsaturated FAs on the Lactobacillus growth. Free FAs included palmitic (16:0), palmitoleic (c9-16:1), stearic (18:0), oleic (c9-18:1), elaidic (t9-18:1), cis-vaccenic (c11-18:1), vaccenic (t11-18:1), linoleic (c9, c12-18:2), conjugated linoleic (c9, t11- and t10, c12-18:2), alpha-linolenic (c9, c12, c15-18:3), alpha-eleostearic (c9, t11, t13-18:3), eicosapentaenoic (20:5), and docosahexaenoic (22:6) acids. Among free FAs, oleic acid stimulated the growth of all Lactobacillus strains, whereas palmitoleic acid had almost no affect on the Lactobacillus growth. Saturated FAs such as stearic and palmitic acids inhibited or did not affect the Lactobacillus growth. Polyunsaturated FAs such as alpha-linolenic, eicosapentaenoic and docosahexaenoic acids strongly inhibited the Lactobacillus growth at 7.6 x 10(-4) m. Octadecenoic acids such as oleic, elaidic, cis-vaccenic and vaccenic acids remarkably promoted the growth of L. gasseri, regardless of the different double bond positions and configurations. When oleic or cis-vaccenic acid was incubated with L. gasseri, the FAs was transformed to cyclopropane FAs (methyleneoctadecanoic acids) after incorporation into the cells. On the other hand, trans FAs such as elaidic and vaccenic acids incorporated into the cells were not converted to another FAs. Conjugated linoleic and alpha-eleostearic acids having a trans double bond promoted the Lactobacillus growth. The growth of L. gasseri was also stimulated by trans-rich free FAs from hydrogenated canola and fish oils. These results showed that octadecenoic acid and trans FAs had strong promotion activities for the Lactobacillus growth due to their incorporation into membrane lipids.

Anti-Bacterial Agents↗

Plasmids in Lactobacillus.

This review describes Lactobacillus plasmids on distribution, structure, function, vector construction, vector stability, application, and prospective. About 38% of species of the genus Lactobacillus were found to contain plasmids with different sizes (from 1.2 to 150 kb) and varied numbers (1 or more). Some Lactobacillus plasmids with small sizes were highly similar to those of single strand plasmids from other Gram-positive bacteria. The extensive sequence homologies of plus origins, replication initiation proteins, minus origins, cointegration sites, and the presence of single strand intermediates supported the fact that these small Lactobacillus plasmids replicate with a rolling-circle replication mechanism. Some Lactobacillus plasmid replicons were of broad host range that could function in other Gram-positive bacteria, and even in Escherichia coli, while replicons of other Gram-positive bacteria also function in Lactobacillus. Although most Lactobacillus plasmids are cryptic, some plasmid-encoded functions have been discovered and applied to vector construction and Lactobacillus identification, detection, and modification.

DNA, Bacterial↗

[Studies of the factors linked to the bacteriostatic ability of Lactobacillus in human vagina].

OBJECTIVE: To study the factors linked to the bacteriostatic ability of Lactobacillus in human vagina, and the relationship between the Lactobacillus and the Candida albicans. METHODS: The content of H2O2, in the upper culture mediums of Lactobacilli were detected at different incubation time. Selecting the strains with vary bacteriostatic ability by Oxford cup test, detecting pH of these strains cultured after different time. After co-cultivation of the Lactobacillus, which has the strongest bacteriostatic ability, Candida albicans and Staphylococci for different incubation time, quantities of these mixed cultures were investigated. RESULTS: The date of pH and the size of the bacteriostatic ring are negative correlation. There is not obvious relationship between the ability of producing H2O2 and the bacteriostatic ability of Lactobacillus. The study of the relationship between bacteria shows that the quantity of Staphylococci is as this: Staphylococci alone > Staphylococci + Lactobacillus > Staphylococci + Lactobacillus + Candida albicans. CONCLUSION: The bacteriostatic ability of Lactobacillus is positivly related to its acid producing ability, and is not obvious to H2O2 content. After 36 hours cultivation time, Candida albicans can boost up the bacteriostatic ability of Lactobacillus.

Adult↗

Detection and identification of Lactobacillus species in crops of broilers of different ages by using PCR-denaturing gradient gel electrophoresis and amplified ribosomal DNA restriction analysis.

The microflora of the crop was investigated throughout the broiler production period (0 to 42 days) using PCR combined with denaturing gradient gel electrophoresis (PCR-DGGE) and selective bacteriological culture of lactobacilli followed by amplified ribosomal DNA restriction analysis (ARDRA). The birds were raised under conditions similar to those used in commercial broiler production. Lactobacilli predominated and attained populations of 10(8) to 10(9) CFU per gram of crop contents. Many of the lactobacilli present in the crop (61.9% of isolates) belonged to species of the Lactobacillus acidophilus group and could not be differentiated by PCR-DGGE. A rapid and simple ARDRA method was developed to distinguish between the members of the L. acidophilus group. HaeIII-ARDRA was used for preliminary identification of isolates in the L. acidophilus group and to identify Lactobacillus reuteri and Lactobacillus salivarius. MseI-ARDRA generated unique patterns for all species of the L. acidophilus group, identifying Lactobacillus crispatus, Lactobacillus johnsonii, and Lactobacillus gallinarum among crop isolates. The results of our study provide comprehensive knowledge of the Lactobacillus microflora in the crops of birds of different ages using nucleic acid-based methods of detection and identification based on current taxonomic criteria.

Aging↗

Single-stranded DNA plasmid, vector construction and cloning of Bacillus stearothermophilus alpha-amylase in Lactobacillus.

Vector plasmids were constructed by ligating chloramphenicol and erythromycin resistance genes to TaqI-digested DNA of a cryptic plasmid from Lactobacillus plantarum. The minimal region of Lactobacillus plasmid DNA that was required for DNA replication was defined and a single-stranded DNA intermediate replication system was observed. Homologies with other origins of replication of plasmids from Gram-positive bacteria, replicating via rolling circle mechanism, were found. It was shown that the constructed vectors, named pPSC20 and pPSC22, were transformable into L. plantarum, Lactobacillus acidophilus, Lactobacillus reuteri, Lactobacillus fermentum, Lactobacillus helveticus, Lactococcus lactis subsp. lactis, Bacillus subtilis, and Escherichia coli. Using plasmid pPSC22, the alpha-amylase gene of Bacillus stearothermophilus was cloned and expressed in several Lactobacillus species.

DNA, Single-Stranded↗

Lactobacillus species prevents colitis in interleukin 10 gene-deficient mice.

BACKGROUND & AIMS: Intestinal luminal microflora, or their products, are likely an important initiating factor in the pathogenesis of inflammatory bowel disease. The aim of this study was to determine the role of colonic aerobic luminal bacteria and Lactobacillus species in the development of colitis in interleukin (IL)-10 gene-deficient mice. METHODS: Intestine from 2-16-week-old mice was scored histologically and cultured for bacteria. Lactobacillus sp. repopulation of the colonic lumen was achieved via daily rectal delivery of Lactobacillus reuteri or oral lactulose therapy. RESULTS: At 2 weeks of age, IL-10 gene-deficient mice showed no colonic injury but did display abnormal colonic bacterial colonization with increased colonic mucosal aerobic adherent and translocated bacteria in conjunction with reduced Lactobacillus sp. levels. In association with the abnormal colonic bacterial colonization, colitis developed by 4 weeks of age. Restoring Lactobacillus sp. to normal levels reduced levels of colonic mucosal adherent and translocated bacteria and attenuated the development of the colitis. CONCLUSIONS: In the neonatal period, IL-10 gene-deficient mice have decreased levels of colonic Lactobacillus sp. and an increase in colonic mucosal adherent and translocated bacteria. Normalizing Lactobacillus sp. levels reduced colonic mucosal adherent and translocated bacteria and prevented colitis.

Age Factors↗

[Role of Lactobacillus as protector against vaginal candidiasis].

BACKGROUND: To evaluate the possible protector role of Lactobacillus against vaginal candidiasis. PATIENTS AND METHOD: In vitro studies performed to assess the capacity of 15 Lactobacillus strains to block the adhesion of two Candida albicans and one C. glabrata strain to vaginal epithelial cells and to inhibit the growth of these yeasts. Moreover, the presence of Lactobacillus was analyzed in 115 vaginal exudates from women with vaginal candidiasis. RESULTS: Only 8 of the 15 lactobacilli studied significantly blocked the adhesion of C. albicans Y18 to vaginal cells. Lactobacilli from group III showed the greatest blocking capacity (62.9%), followed by group II (50.6%) and group I (26.1%). In solid assays, none of the 15 Lactobacillus strains studied was able to inhibit growth of the 3 yeasts. However, in liquid assays some lactobacilli evidenced a certain degree of inhibitory power against C. albicans Y17 (35.7%, 41.7% and 38.1% of light transmittance for Lactobacillus groups I, II and III, respectively). Lactobacillus was detected in 89.6% of women with vaginal candidiasis (by microscopy in 87.8% and by culture in 72.2%). CONCLUSIONS: These results lead us to suggest that probably Lactobacillus provides protection against vaginal candidiasis.

Adult↗

Lactobacillus strains isolated from Danbo cheese as adjunct cultures in a cheese model system.

Isolates of Non-Starter Lactic Acid Bacteria (NSLAB) from six ripened Danbo cheeses of different ages and of different brands were examined. Special emphasis was on the genus Lactobacillus with the aim of investigating their role in cheese maturation. Thirty-three isolates were typed by the PCR-based method, Randomly Amplified Polymorphic DNA (RAPD). Ten RAPD types were found and 70% of the isolates were of RAPD types found in more than one cheese. The different RAPD types were identified to species level by Temporal Temperature Gradient Gel Electrophoresis (TTGE). Most of the isolates were identified as Lactobacillus paracasei (76%), but also Lactobacillus curvatus, Lactobacillus plantarum, Lactobacillus rhamnosus and some taxa originating from the starter culture were detected. In one cheese, no lactobacilli were found. One strain of the most frequent Lactobacillus RAPD type from each of the five cheeses with a Lactobacillus flora was used as adjunct cultures in a cheese model system. Four of the five adjuncts were re-isolated during ripening. Two adjunct containing model cheeses received higher flavour scores than the control while two other were associated with off-flavours. The two model cheeses with off-flavour had a similar microflora and both were after 13 weeks of ripening dominated by a strain identified as L. plantarum.

Bacterial Typing Techniques↗

Signalling mechanisms involved in the induction of inducible nitric oxide synthase by Lactobacillus rhamnosus GG, endotoxin, and lipoteichoic acid.

BACKGROUND AND AIMS: Probiotic Lactobacillus rhamnosus GG (Lactobacillus GG) has been found beneficial in the treatment of viral and antibiotic-associated diarrhea. Recently, it has also been shown to induce nitric oxide (NO) production, and have some other immunostimulatory effects. The aim of the present study was to investigate the mechanisms involved in the induction of inducible nitric oxide synthase (iNOS) and NO production by Lactobacillus GG. METHODS AND RESULTS: iNOS expression and NO production induced by Lactobacillus GG, lipopolysaccharide (LPS), and lipoteichoic acid (LTA) was abrogated by NOS inhibitors L-NMMA and 1400W, by a protein synthesis inhibitor cycloheximide, by a tyrosine kinase inhibitor genistein and by a NF-kappaB inhibitor pyrrolidinedithiocarbamate (PDTC) in J774 macrophages. Polymyxin B inhibited NO production induced by LPS, but did not inhibit Lactobacillus GG induced NO production. p42/44 MAP-kinase inhibitor PD98059, dexamethasone and cyclosporine A inhibited partially iNOS protein expression and NO formation in Lactobacillus GG, LPS and LTA treated cells. Ro 31-8220 (protein kinase C inhibitor) and SB203580 (p38 MAP-kinase inhibitor) had only a minor effect on NO production. CONCLUSIONS: Lactobacillus GG induced NO production through iNOS pathway and the mechanisms mediating that process were very similar with those involved in LPS and LTA induced NO synthesis.

Animals↗

Characterization and selection of vaginal Lactobacillus strains for the preparation of vaginal tablets.

AIMS: To characterize and select Lactobacillus strains for properties that would make them a good alternative to the use of antibiotics to treat human vaginal infections. METHODS AND RESULTS: Ten Lactobacillus strains belonging to four different Lactobacillus species were analysed for properties relating to mucosal colonization or microbial antagonism (adhesion to human epithelial cells, hydrogen peroxide production, antimicrobial activity towards Gardnerella vaginalis and Candida albicans and coaggregation with pathogens). The involvement of electrostatic interactions and the influence of bacterial metabolic state in the binding of lactobacilli to the cell surface were also studied. Adherence to epithelial cells varied greatly among the Lactobacillus species and among different strains belonging to the same Lactobacillus species. The reduction in surface negative electric charge promoted the binding of several Lactobacillus strains to the cell membrane whereas lyophilization reduced the adhesion capacity of many isolates. The antimicrobial activity of lactobacilli culture supernatant fluids was not directly related to the production of H2O2. CONCLUSIONS: Three strains (Lactobacillus brevis CD2, Lact. salivarius FV2 and Lact. gasseri MB335) showed optimal properties and were, therefore, selected for the preparation of vaginal tablets. The selected strains adhered to epithelial cells displacing vaginal pathogens; they produced high levels of H2O2, coaggregated with pathogens and inhibited the growth of G. vaginalis. SIGNIFICANCE AND IMPACT OF THE STUDY: The dosage formulation developed in this study appears to be a good candidate for the probiotic prophylaxis and treatment of human vaginal infections.

Bacterial Adhesion↗

Study of the effect of lactobacillus GG supplementation in combination with and without arginine aspartate on lipoproteins and liver peroxidation in cholesterol-fed rats.

The effect of diet integration with lactobacillus GG and arginine aspartate administered singly or together to rats submitted to a cholesterol-enriched diet have been evaluated by measuring both the changes in the levels of cholesterol and triglycerides and the variations of the most indicative parameters of peroxidation in plasma lipoproteins and livers. The administration of lactobacillus GG alone is able to induce a significant hypocholesterolaemic effect while the arginine aspartate singly or together with the lactobacillus does not seem to promote any significant hypocholesterolaemic effect. The cholesterol levels (expressed as mg x dL-1) are in fact: 45.5 for the control diet; 185.4 for the cholesterol-enriched diet; 131.1 for the cholesterol-enriched diet + lactobacillus; 178.2 for the cholesterol enriched diet + arginine aspartate and 122.4 for the cholesterol-enriched diet + lactobacillus + arginine aspartate. On the contrary, the co-administration of lactobacillus and arginine aspartate gives rise to a very high preventive activity against the cholesterol-induced peroxidation damages both in the plasma lipoproteins and in the liver. Such preventive activity is higher by far than that obtainable when lactobacillus or arginine aspartate are administered singly to the rats.

Animals↗

Digestive and bacterial enzyme activities in broilers fed diets supplemented with Lactobacillus cultures.

A study was carried out to investigate the effects of adherent Lactobacillus cultures on 1) amylolytic, lipolytic, and proteolytic enzyme activities in the contents of the small intestine (from the distal end of the duodenum to the ileocecal junction) and 2) bacterial beta-glucuronidase and beta-glucosidase activities in the intestinal contents and feces of broiler chickens. Three dietary treatments were randomly assigned to three groups of chicks, i.e., basal diet only (control group), basal diet + 0.1% dried culture of Lactobacillus acidophilus, and basal diet + 0.1% dried culture of a mixture of 12 Lactobacillus strains. The results showed that supplementation of the adherent Lactobacillus cultures to chickens, either as a single strain of L. acidophilus or as a mixture of 12 Lactobacillus strains, increased significantly (P < 0.05) the levels of amylase in the small intestine. However, the proteolytic and lipolytic activities in the small intestine were not affected by addition of either of the adherent Lactobacillus cultures. Addition of either L. acidophilus or a mixture of 12 Lactobacillus strains was also found to reduce significantly (P < 0.05) the intestinal and fecal beta-glucuronidase and fecal beta-glucosidase but not the intestinal beta-glucosidase at 40 d of feeding.

Amylases↗

Lactobacillus kimchii sp. nov., a new species from kimchi.

A bacteriocin-producing lactic acid bacterium, which was isolated from the Korean fermented-vegetable food kimchi, was subjected to a polyphasic taxonomic study using phenotypic characterization and phylogenetic and genetic methods. This organism (MT-1077T) has phenotypic properties that are consistent with the description characterizing the genus Lactobacillus. Phylogenetic analysis based on 16S rDNA sequences showed clearly that strain MT-1077T is a member of the genus Lactobacillus. The closest phylogenetic relatives are Lactobacillus alimentarius KCTC 3593T and Lactobacillus farciminis LMG 9200T, with levels of 16S rDNA similarity of 98.4 and 98.2%, respectively. Levels of 16S rDNA similarity between strain MT-1077T and other Lactobacillus species were less than 93.0%. Differences in some phenotypic characteristics and DNA-DNA relatedness data indicated that strain MT-1077T should be distinguished from L. alimentarius KCTC 3593T and L. farciminis LMG 9200T. On the basis of the data presented, it is proposed that strain MT-1077T should be placed in the genus Lactobacillus as a new species, Lactobacillus kimchii sp. nov. The type strain of the new species is strain MT-1077T (= KCTC 8903PT = JCM 10707T).

Bacterial Typing Techniques↗

The aggregation of human platelets by Lactobacillus species.

The ability to aggregate human platelets was examined for five Lactobacillus rhamnosus strains and five Lactobacillus paracasei subsp. paracasei strains isolated from patients with infective endocarditis (IE), 25 laboratory isolates from the same two species, and 14 strains from five other oral species, namely Lactobacillus acidophilus, Lactobacillus fermentum, Lactobacillus oris, Lactobacillus plantarum and Lactobacillus salivarius. Amongst the L. rhamnosus strains, platelets were aggregated by all five IE strains and 8/16 laboratory strains. For the L. paracasei subsp. paracasei strains, the respective numbers were 2/5 and 2/9. Aggregation also occurred with 11/14 strains of the other five species; each species was represented. The optimal ratio of bacteria to platelets for aggregation was approximately 1:1, and there was considerable variation in the lag phase that preceded aggregation, depending on the source of the platelets. Overall, the lag phase varied between 0.25 +/- 0.1 and 20.4 +/- 3.2 min and the percentage aggregation ranged between 70 +/- 2.6 and 104 +/- 13.5%. Confirmation that aggregation was being observed came from studies with five strains on the inhibitory effects of EDTA, dipyridamole, apyrase, imipramine, acetylsalicylic acid and quinacrine. Inhibition of aggregation by L. rhamnosus strains by the peptide arginine-glycine-aspartic acid-serine (RGDS) further indicated a role for fibronectin and/or fibrinogen. Pronase treatment of cells for 1 h and extraction of bacterial surface components with 0.1 M-Tris/HCl (pH 8.5) at 37 degrees C for 1 h stopped aggregation in 8/9 IE strains. Extracted surface proteins (200 micrograms) completely inhibited platelet aggregation by 8/9 of the homologous strains.(ABSTRACT TRUNCATED AT 250 WORDS)

Bacteremia↗

Characterization of lactobacilli from Scotch malt whisky distilleries and description of Lactobacillus ferintoshensis sp. nov., a new species isolated from malt whisky fermentations.

Sixty-four strains of Lactobacillus were isolated from fermentation samples from 23 malt whisky distilleries located in the major whisky producing regions of Scotland. The strains were assigned to 26 ribotype patterns. Strains of some ribotype patterns were widely distributed and recovered from distilleries throughout Scotland, while strains representing other ribotypes were particular to a specific region or even a certain distillery. Repeated sampling of a single distillery over a 12 month period showed that the range of bacteria present, as indicated by ribotyping, was stable, but was influenced by changes in malt supply and the period of closure for annual maintenance. Partial 16S rDNA sequence analysis of ribotype representatives revealed Lactobacillus brevis, Lactobacillus fermentum, Lactobacillus paracasei and Lactobacillus pentosus as the major species present in the distilleries; however, four isolates could not be identified by this procedure. Determination of the full 16S rDNA gene sequence from one of these isolates (strain R7-84) revealed >98.5% similarity to Lactobacillus buchneri and its phylogenetic neighbours. DNA from two other strains showed greater than 70% hybridization to DNA from R7-84 under non-stringent renaturation conditions and DNA from strain R7-84 shared less than 65% hybridization with members of the L. buchneri group. It is proposed that these three strains should be placed in a new species for which the name Lactobacillus ferintoshensis represented by the type strain R7-84(T) is suggested.

Alcoholic Beverages↗

Lactobacillus rossii sp. nov., isolated from wheat sourdough.

Screening of sourdough lactic acid bacteria for bacteriocin production resulted in the isolation of a Gram-positive, catalase-negative, non-spore-forming, non-motile rod bacterium (strain CS1T) that could not be associated with any previously described species. Comparative 16S rRNA gene sequence analysis recognized strain CS1T as a distinct member of the genus Lactobacillus. By a species-specific PCR strategy, five additional strains previously isolated from sourdoughs were found to belong to the same species as strain CS1T, as confirmed by 16S rRNA gene sequence analysis. The closest related species were Lactobacillus durianis, Lactobacillus malefermentans and Lactobacillus suebicus, with which strain CS1T shared 93 % sequence similarity. For a further characterization of strain CS1T, physiological (growth temperature, CO2 production, hydrolysis of arginine, isomeric type of lactate, sugar fermentation) and chemotaxonomic (G+C content and peptidoglycan structure) properties were determined. Phenotypic characterization showed that strain CS1T was a member of the obligately heterofermentative group of the genus Lactobacillus. The DNA G+C content was 44.6 mol%. The peptidoglycan was of the A3alpha (L-Lys-L-Ser-L-Ala2) type. Physiological, biochemical and genotypic data, as well as results of DNA-DNA hybridization of genomic DNA with one of the closest phylogenetic relatives, L. durianis (34.3 %), indicated that strain CS1T represents a novel species of the genus Lactobacillus for which the name Lactobacillus rossii sp. nov. is proposed. The type strain of this species is CS1T (=ATCC BAA-822T=DSM 15814T).

Base Composition↗

Polyphasic study of wine Lactobacillus strains: taxonomic implications.

One hundred and seventy-eight lactobacilli isolated from wine were characterized by a polyphasic approach. Strains were phenotypically identified at genus and species level by classical tests including the analysis of cell morphology, homo/heterofermentative character, sugar fermentation patterns, growth at different temperatures and the optical nature of the isomer of lactic acid produced from glucose. Molecular techniques such as random amplification of polymorphic DNA (RAPD), amplified 16S rDNA restriction analysis (16S-ARDRA), PFGE-RFLP and ribotyping were used to characterize strains, and their potential for identification and/or typing was evaluated. The information obtained with these techniques was processed with the BioNumerics software in order to analyse relationships existing between isolated strains and various reference species of the genus. Then, taxonomic dendrograms were obtained, and this information allowed the proposal of molecular procedures suitable for the identification and typing of these wine micro-organisms. The techniques useful for both identification and typing were RAPD and ribotyping, while 16S-ARDRA was only useful for identification and PFGE-RFLP only for typing purposes. The wine strains were identified as Lactobacillus brevis (19 strains), Lactobacillus collinoides (2 strains), Lactobacillus hilgardii (71 strains), Lactobacillus paracasei (13 strains), Lactobacillus pentosus (2 strains), Lactobacillus plantarum (34 strains) and Lactobacillus mali (10 strains).

Bacterial Typing Techniques↗

Lactobacillus nantensis sp. nov., isolated from French wheat sourdough.

A polyphasic taxonomic study of the bacterial flora isolated from traditional French wheat sourdough, using phenotypic characterization and phylogenetic as well as genetic methods, revealed a consistent group of isolates that could not be assigned to any recognized species. These results were confirmed by randomly amplified polymorphic DNA and amplified fragment length polymorphism fingerprinting analyses. Cells were Gram-positive, homofermentative rods. Comparative 16S rRNA gene sequence analysis of the representative strain LP33T indicated that these strains belong to the genus Lactobacillus and that they formed a branch distinct from their closest relatives Lactobacillus farciminis, Lactobacillus alimentarius, Lactobacillus paralimentarius and Lactobacillus mindensis. DNA-DNA reassociation experiments with the three phylogenetically closest Lactobacillus species confirmed that LP33T (= DSM 16982T = CIP 108546T = TMW 1.1265T) represents the type strain of a novel species, for which the name Lactobacillus nantensis sp. nov. is proposed.

Bread↗