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PubMed2005

The effects of Lactobacillus-fermented milk on lipid metabolism in hamsters fed on high-cholesterol diet.

The objective of this study was to evaluate the effects of local Lactobacillus strains (NTU 101 and 102) on cholesterol-lowering effects in vivo. Thirty male hamsters were housed, divided into five groups, and fed on a cholesterol diet (5 g/kg diet) to induce hypercholesterolemia. Milk fermented by Lactobacillus paracasei subsp. paracasei NTU 101, Lactobacillus plantarum NTU 102, and Lactobacillus acidophilus BCRC 17010 was administrated for this study. After treatment with different fermented milk, blood was taken and liver was removed for the determination of lipoproteins, including total cholesterol, high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C), and triglyceride. Lactobacilli and bifidobacteria decreased (10(5)) in the control group; when hamsters were fed on fermented milk, the number of lactobacilli (10(7)-10(8)) and bifidobacteria (10(5)-10(7)) was increased. Serum and liver total cholesterol levels were significantly reduced by about 26.4, 23.5, and 30.1% and by about 17.7, 15.9, and 13.4% when hamsters were given fermented milk. However, serum HDL-C and LDL-C were also reduced. The results of this study showed that the hypocholesterolemic effect of local Lactobacillus strains was attributed to its ability to lower serum and liver total cholesterol levels. Thus, local Lactobacillus strains could significantly increase probiotic count.

Animals↗
PubMed2005

Influence of sample type and collection method on Streptococcus mutans and Lactobacillus spp. counts in the oral cavity.

OBJECTIVES: This study compared three methods of Streptococcus mutans and Lactobacillus spp. detection in the oral cavity: saliva swab (SS)-sample of stimulated saliva collected with swab; whole saliva (WS)-sample of 2 ml of stimulated saliva; and the dental plaque method (DP)-plaque sample of all dental surfaces. METHODS: Thirty children were included in this study. In the first 15 children, the SS and WS methods were carried out before the dental plaque collection, and in the following 15, the sequence was inverted to evaluate possible interference of the methods sequence. The samples were diluted and inoculated in SB20 and Rogosa agar, respectively for S.mutans and Lactobacillus spp., at 37 degrees C for 48 h. RESULTS: The results (cfu/mL) of S. mutans were analysed by the statistical Friedman's test. The levels of Lactobacillus spp. were analysed by descriptive statistics due to the high proportion of zero counts in the culture. In the first sequence of methods, the number of S. mutans counted for the SS method was inferior to DP and WS (P<0.05), and the results for the WS and DP methods were similar. The detection of Lactobacillus spp. was observed just by the WS (100%) and SS (14.3%) methods. However, in the second experimental set the number of S. mutans detected by the DP method was similar to those of the SS and WS, however, the WS method showed higher values than SS (P<0.05). A greater number of Lactobacillus spp. was detected by the WS method (100%), followed by SS (55.5%) and DP (33.3%). CONCLUSIONS: The dental plaque collection and the sample of stimulated whole saliva presented similar results in the S. mutans count. The most suitable method to detect the Lactobacillus spp. level in the oral cavity is the stimulated whole saliva method.

Child↗
PubMed2005

Effects of Lactobacillus GG on genes expression pattern in small bowel mucosa.

BACKGROUND AND AIMS: Probiotics have been used for cure and prevention of several clinical conditions. However, further insights into the mechanism of action are needed to understand the rationale of their use. The aim of this study was to investigate the influence of Lactobacillus GG on the genetic expression patterns in the small bowel mucosa. METHODS: Six male patients (38+/-5 years) with endoscopically proven oesophagitis were enrolled. All patients were treated for 1 month with esomeprazole and randomised to receive Lactobacillus GG or placebo. After 1 month of treatment, upper endoscopy was repeated. Biopsies of the duodenal mucosa were taken prior to and after the treatment, and the genes expression patterns were assessed using GeneChip Human U133A array. Genes with significant expression changes were selected and analysed to identify specific cellular pathways modified by Lactobacillus GG. To support the array data, 10 target genes were studied using Syber-Green PCR. RESULTS: Microarray analysis showed that Lactobacillus GG administration determined the up- and down-regulation of 334 and 92 genes, respectively. Real-time PCR confirmed the reliability of the analysis. Lactobacillus GG mainly affected the expression of genes involved in immune response and inflammation (TGF-beta and TNF family members, cytokines, nitric oxide synthase 1, defensin alpha 1), apoptosis, cell growth and cell differentiation (cyclins and caspases, oncogenes), cell-cell signalling (ICAMs and integrins), cell adhesion (cadherins), signal transcription and transduction. CONCLUSIONS: These data indicate that administration of Lactobacillus GG is associated with a complex genetic response of the duodenal mucosa, reflected by the up- and down-regulation of several genes involved in specific cellular pathways.

Adult↗
PubMed2004

Identification, characterisation and specificity of a cell wall lytic enzyme from Lactobacillus fermentum BR11.

Screening of a genomic library with an antiserum raised against whole Lactobacillus fermentum BR11 cells identified a clone expressing an immunoreactive 37-kDa protein. Analysis of the 3010-bp DNA insert contained within the clone revealed four open reading frames (ORFs). One ORF encodes LysA, a 303 amino acid protein which has up to 35% identity with putative endolysins from prophages Lj928 and Lj965 from Lactobacillus johnsonii and Lp1 and Lp2 from Lactobacillus plantarum as well as with the endolysin of Lactobacillus gasseri bacteriophage Phiadh. The immunoreactive protein was shown to be encoded by a truncated ORF downstream of lysA which has similarity to glutamyl-tRNA synthetases. The N-terminus of LysA has sequence similarity with N-acetylmuramidase catalytic domains while the C-terminus has sequence similarity with putative cell envelope binding bacterial SH3b domains. C-terminal bacterial SH3b domains were identified in the majority of Lactobacillus bacteriophage endolysins. LysA was expressed in Escherichia coli and unusually was found to have a broad bacteriolytic activity range with activity against a number of different Lactobacillus species and against Lactococcus lactis, streptococci and Staphylococcus aureus. It was found that LysA is 2 and 8000 times more active against L. fermentum than L. lactis and Streptococcus pyogenes, respectively.

Amino Acid Sequence↗
PubMed2005

The use of Lactobacillus GG in irritable bowel syndrome in children: a double-blind randomized control trial.

OBJECTIVE: To determine whether oral administration of the probiotic Lactobacillus GG under randomized, double-blinded, placebo-controlled conditions would improve symptoms of irritable bowel syndrome (IBS) in children. STUDY DESIGN: Fifty children fulfilling the Rome II criteria for IBS were given Lactobacillus GG or placebo for 6 weeks. Response to therapy was recorded and collected on a weekly basis using the Gastrointestinal Symptom Rating Scale (GSRS). RESULTS: Lactobacillus GG was not superior to placebo in relieving abdominal pain (40.0% response rate in the placebo group vs 44.0% in the Lactobacillus GG group; P=.774). There was no difference in the other gastrointestinal symptoms, except for a lower incidence of perceived abdominal distention (P=.02 favoring Lactobacillus GG). CONCLUSIONS: Lactobacillus GG was not superior to placebo in the treatment of abdominal pain in children with IBS but may help relieve such symptoms as perceived abdominal distention.

Abdominal Pain↗
PubMed2005

Development of a strain-specific assay for detection of viable Lactobacillus sp. HOFG1 after application to cattle feed.

A strain-specific assay was developed for the detection of viable Lactobacillus on cattle feed. The DNA sequences of the 16S rRNA gene and four different 16S/23S rRNA intergenic spacer regions (ISR) from Lactobacillus sp. HOFG1 were determined. Based on these sequences, a strain-specific primer was designed for the amplification of one of the ISRs. When combined with a Lactobacillus group primer, the polymerase chain reaction (PCR) assay detected only Lactobacillus sp. HOFG1 and not other closely related L. animalis or L. murinus strains. The feed assay uses a combination of enrichment culturing and PCR to detect and enumerate viable Lactobacillus sp. HOFG1 after its application onto cattle feed. The high degree of primer specificity and use of selective culturing allows for the detection of viable Lactobacillus which is useful in tracking bacteria applied to complex feed mixtures that contain a high background of endogenous bacteria.

Animal Feed↗
PubMed2000

Strain-dependent induction of cytokine profiles in the gut by orally administered Lactobacillus strains.

Different Lactobacillus strains are frequently used in consumer food products. In addition, recombinant lactobacilli which contain novel expression vectors can now be used in immunotherapeutic applications such as oral vaccination strategies and in T cell tolerance induction approaches for autoimmune disease. Both for food and clinical applications of lactobacilli, proper selection of wild type strains is crucial. For that purpose, eight different common Lactobacillus strains were analysed with respect to mucosal induction of pro- and anti-inflammatory cytokines, IgA-producing plasma cells in the gut, as well as systemic antibody responses against a parenterally administered antigen. Immunohistochemical analysis of cytokine-producing cells in the gut villi showed no significant induction of the cytokines IL-1alpha, IFN-gamma, IL-4 or IL-10 after oral administration of wild type Lactobacillus strains. In contrast, oral administration of L. reuteri and L. brevis induced expression of the proinflammatory/Th1 cytokines TNF-alpha, IL-2 and/or IL-1beta. Oral administration of these two strains and L. fermentum also significantly enhanced the IgG response against parenterally administered haptenated chicken gamma globulin (TNP-CGG). The five other strains did not show this adjuvanticity. L. reuteri induced relatively high levels of IgG2a compared to L. murines, a nonadjuving Lactobacillus strain. These findings imply that different Lactobacillus strains induce distinct mucosal cytokine profiles and possess differential intrinsic adjuvanticity. This suggests that rational Lactobacillus strain selection provides a strategy to influence cytokine expression and thereby influence immune responses.

Adjuvants, Immunologic↗
PubMed2003

Effect of Lactobacillus-fermented diets on bacterial translocation and intestinal flora in experimental prehepatic portal hypertension.

Spontaneous bacterial infections in cirrhosis and portal hypertension have been attributed to translocation of gut-derived bacteria, a process promoted by intestinal bacterial overgrowth and disruption of the gut mucosal barrier. Bacteriotherapy with Lactobacillus has been reported to correct bacterial overgrowth, stabilize mucosal barrier function, and decrease bacterial translocation in rat models of acute liver injury and failure. In this study we investigated the effect of Lactobacillus-supplemented diets on intestinal flora and on bacterial translocation rate in portal vein ligated rats. Lactobacillus-fermented milk (yogurt) containing at least 2 x 10(9) colony forming units/ml or placebo (water) was adminstrated by gavage twice daily (2 ml) for 9 days. Portal vein ligation was performed on day 7 of treatment. Bacterial translocation to mesenteric lymph nodes and quantification of intestinal flora was assessed by standard bacteriological cultures. Bacterial translocation was not significantly different between animals that received yogurt (82%) and those that received placebo (75%). Yogurt did not induce any significant changes in intestinal flora, whether it was produced with Lactobacillus acidophilus or Lactobacillus GG. In conclusion, in acute prehepatic portal hypertension, bacteriotherapy with Lactobacillus was unable to induce changes in bacterial translocation probably because it was unable to induce changes in bacterial flora.

Animals↗
PubMed2004

Modulation of the effect of dextran sulfate sodium-induced acute colitis by the administration of different probiotic strains of Lactobacillus and Bifidobacterium.

The pathogenic mechanism of inflammatory bowel diseases is not fully understood but colonic microflora including Lactobacillus and Bifidobacterium species may affect the induction of colonic inflammation. In this study the relative efficacy of different probiotic organisms in the prevention of colitis was compared in an induced rat colitis model. Three Lactobacillus strains and two Bifidobacterium strains were fed to Sprague-Dawley rats for 7 days prior to offering the rats 5% dextran sulfate sodium (DSS) in their drinking water to induce colitis and the administration of the probiotics continued for 7 days with the DSS. Colitis severity was assessed daily using a disease activity index (DAI). Samples were collected 7 days after colitis induction for intestinal bacterial flora and bacterial translocation. The DAI decreased significantly on days 4, 5, 6, and 7 in the Lactobacillus plantarum DSM 9843, Bifidobacterium sp. 3B1, and Bifidobacterium infantis DSM 15158 groups compared to the colitis control. It decreased significantly on days 5, 6, and 7 in the Bifidobacterium infantis DSM 15158 group compared to the Lactobacillus paracaesi DSM 13434 and Lactobacillus gasseri 5B3 groups. It also decreased significantly on day 7 in the L. plantarum DSM 9843 group compared to the L. gasseri 5B3 group. Bacterial translocation to the mesenteric lymph nodes decreased significantly in all treatment groups compared to the colitis control. Enterobacteriaceae bacterial translocation to the liver decreased in all treatment groups compared to the colitis control. Administration of certain strains of Lactobacillus and Bifidobacterium significantly improves the DAI and reduces bacterial translocation, and L. plantarum DSM 9843, Bifidobacterium sp. 3B1, and Bifidobacterium infantis DSM 15158 seem to have the best effect.

Acute Disease↗
PubMed2000

Use of the DNA sequence of variable regions of the 16S rRNA gene for rapid and accurate identification of bacteria in the Lactobacillus acidophilus complex.

The Lactobacillus acidophilus complex includes Lact. acidophilus, Lactobacillus amylovorus, Lactobacillus crispatus, Lactobacillus gallinarum, Lactobacillus gasseri and Lactobacillus johnsonii. The objective of this work was to develop a rapid and definitive DNA sequence-based identification system for unknown isolates of the Lact. acidophilus complex. A approximately = 500 bp region of the 16S rRNA gene, which contained the V1 and V2 variable regions, was amplified from the isolates by the polymerase chain reaction. The sequence of this region of the 16S rRNA gene from the type strains of the Lact. acidophilus complex was sufficiently variable to allow for clear differentiation amongst each of the strains. As an initial step in the characterization of potentially probiotic strains, this technique was successfully used to identify a variety of unknown human intestinal isolates. The approach described here represents a rapid and definitive method for the identification of Lact. acidophilus complex members.

Base Sequence↗
PubMed2006

Cloacal Lactobacillus isolates from broilers show high prevalence of resistance towards macrolide and lincosamide antibiotics.

Eighty-seven Lactobacillus strains isolated from cloacal swabs of broiler chickens derived from 20 different farms in Belgium were identified to species level and tested for susceptibility to macrolide and lincosamide antibiotics. Five different Lactobacillus species were identified as being predominantly present in the cloacae of broilers: Lactobacillus crispatus, Lactobacillus salivarius subsp. salivarius, Lactobacillus amylovorus, Lactobacillus gallinarum and Lactobacillu sreuteri. Acquired resistance prevalence to macrolides and lincosamides was very high in the investigated lactobacilli: 89% of the strains were resistant to either or both lincosamide and macrolide class antibiotics. The vast majority of these resistant strains (96%) displayed constitutive resistance. More than one-half of the macrolide and/or lincosamide resistant strains carried an erm(B), erm(C), mef(A), lnu(A) gene or a combination of these genes.

Animals↗
PubMed2004

Lactobacillus peritonitis: a rare cause of peritonitis in peritoneal dialysis patients.

Lactobacilli are part of the normal gastrointestinal and female genitourinary flora in humans and they are seldom pathogenic and rarely cause human disease. In the literature, Lactobacillus peritonitis was most common in immunocompromised patients, including patients under chronic peritoneal dialysis. We also suspect that the presence of Lactobacillus spp. in the peritoneal fluid might indicate the leakage of normal flora from a perforated intraabdominal hollow organ. To access the versatile clinical pictures of Lactobacillus peritonitis, this investigation retrospectively reviewed the medical records for Lactobacillus spp. isolated from peritoneal fluid from July 1998 to January 2002 at Chang-Gung Memorial Hospital, Taipei, Taiwan. A total of 10 patients were enrolled in the study. Six of these 10 patients had concomitant intraabdominal hollow organ perforation, and peritoneal fluid cultures in these six patients also contained bacteria other than Lactobacillus spp. All six patients had recently experienced either abdominal surgery or blunt abdominal trauma. The remaining four patients who had not undergone surgery had decompensated liver cirrhosis with ascites and spontaneous bacterial peritonitis. The results suggested that the presence of Lactobacillus spp. in the peritoneal fluid other than immunocompromised patients should raise the suspicion of hollow organ perforation in patients with recent abdominal surgery or blunt abdominal trauma.

Abdominal Cavity↗
PubMed2000

Assessment of the capacity of Lactobacillus to inhibit the growth of uropathogens and block their adhesion to vaginal epithelial cells.

To gain insight into the mechanisms by which Lactobacillus blocks the adherence of uropathogens to vaginal epithelial cells and inhibits their growth, 15 Lactobacillus strains and 22 uropathogens were studied. Lactobacilli from hemagglutination group III, identified as Lactobacillus crispatus, showed greater capacity to block uropathogen adherence than those from hemagglutination groups II and I (61.9%, 49.5%, and 52.6% of blockage, respectively). Pseudomonas aeruginosa PA5 and Klebsiella pneumoniae KP7 were the uropathogens most susceptible to blockage, and Staphylococcus aureus SA11 and Proteus mirabilis PM1 were the most resistant. Lactobacillus inhibited uropathogen growth better in liquid assays; the 3 Lactobacillus groups showed similar inhibitory power (72.3%, 71.9%, and 74.2% of light transmittance). P. aeruginosa PA5 was the most inhibited, and Enterococcus species E15 was the least inhibited. There is considerable variation among Lactobacillus strains regarding their adherence to uroepithelium, blockage of uropathogen attachment, and inhibition of uropathogen growth. Although these properties are independent, they may coincide and therefore allow for these strains to balance the vaginal ecosystem and to make them useful as probiotics.

Adolescent↗
PubMed1999

A randomized trial of Lactobacillus acidophilus BG2FO4 to treat lactose intolerance.

BACKGROUND: Lactose intolerance is the most common disorder of intestinal carbohydrate digestion. Lactobacillus acidophilus BG2FO4 is a strain of lactobacilli with properties of marked intestinal adherence and high beta-galactosidase activity. OBJECTIVE: This study was designed to determine whether oral feeding of Lactobacillus acidophilus BG2FO4 leads to a lactose-tolerant state. DESIGN: We studied 42 subjects with self-reported lactose intolerance and performed breath-hydrogen tests to determine whether they were lactose maldigesters. Subjects with established lactose maldigestion (n = 24) were invited to be randomly assigned to an omeprazole-treated (hypochlorhydric) group or a non-omeprazole-treated group, but 6 subjects chose not to participate. All randomly assigned subjects (n = 18) ingested Lactobacillus acidophilus BG2FO4 twice per day for 7 d and stool samples were collected. Breath-hydrogen tests were performed and symptom scores were recorded at baseline and after lactobacilli ingestion. RESULTS: Lactose maldigestion was established in 24 of 42 subjects (57%) with self-reported lactose intolerance. In 18 lactose-maldigesting subjects, overall hydrogen production and symptom scores after ingestion of Lactobacillus acidophilus BG2FO4 were not significantly different from baseline values. Live Lactobacillus acidophilus BG2FO4 was recovered in stool samples from 7 subjects. CONCLUSIONS: Lactose intolerance is overreported in subjects with gastrointestinal symptoms after lactose ingestion. Treatment of lactose-maldigesting subjects with and without hypochlorhydria with Lactobacillus acidophilus BG2FO4 for 7 d failed to change breath-hydrogen excretion significantly after lactose ingestion.

Adult↗
PubMedDate not supplied

Acetaldehyde production and metabolism by human indigenous and probiotic Lactobacillus and Bifidobacterium strains.

Many human gastrointestinal facultative anaerobic and aerobic bacteria possess alcohol dehydrogenase (ADH) activity and are therefore capable of oxidizing ethanol to acetaldehyde. We examined whether human gastrointestinal lactobacilli (three strains), bifidobacteria (five strains) and probiotic Lactobacillus GG ATCC 53103 are also able to metabolize ethanol and acetaldehyde in vitro. Acetaldehyde production by bacterial suspensions was determined by gas chromatography after a 1-h incubation with 22 mM ethanol. To determine the acetaldehyde consumption, the suspensions were incubated with 50 microM or 500 microM acetaldehyde as well as with 500 microM acetaldehyde and 22 mM ethanol, i.e. under conditions resembling those in the human colon after alcohol intake. The influence of growth media and bacterial concentration on the ability of lactobacilli to metabolize acetaldehyde and to produce acetate from acetaldehyde were determined. ADH and aldehyde dehydrogenase (ALDH) activities were determined spectrophotometrically. Neither measurable ADH nor ALDH activities were found in aerobically grown Lactobacillus GG ATCC 53103 and Lactobacillus acidophilus ATCC 4356 strains. All the lactobacilli and bifidobacteria strains revealed a very limited capacity to oxidize ethanol to acetaldehyde in vitro. Lactobacillus GG ATCC 53103 had the highest acetaldehyde-metabolizing capacity, which increased significantly with increasing bacterial concentrations. This was associated with a marked production of acetate from acetaldehyde. The type of the growth media had no effect on acetaldehyde consumption. Addition of ethanol to the incubation media diminished the acetaldehyde-metabolizing capacity of all strains. However, in the presence of ethanol, Lactobacillus GG ATCC 53103 still demonstrated the highest capacity for acetaldehyde metabolism of all strains. These data suggest a beneficial impact of Lactobacillus GG ATCC 53103 on high gastrointestinal acetaldehyde levels following alcohol intake. The possible clinical implications of this finding remain to be established in in vitro studies.

Acetaldehyde↗
PubMed2005

Influence of beta-glucanase-producing Lactobacillus strains on intestinal characteristics and feed passage rate of broiler chickens.

Two experiments were conducted to study the effects of beta-glucanase produced by transformed Lactobacillus strains on the intestinal characteristics and feed passage rate of broiler chickens fed barley-based diets. Supplementation of transformed Lactobacillus strains to the diet of chickens significantly (P < 0.05) reduced the intestinal fluid viscosity by 21 to 46% compared with chickens fed an unsupplemented diet or a diet supplemented with parental Lactobacillus strains. The relative weights of pancreas, liver, duodenum, jejunum, ileum, ceca, and colon were reduced (P < 0.05) by 6 to 27%, and the relative length of duodenum, jejunum, ileum, and ceca was reduced (P < 0.05) by 8 to 15%. Histological examination of the intestinal tissues showed that the jejunal villus height of chickens fed a diet supplemented with transformed Lactobacillus strains was significantly (P < 0.05) higher than that of chickens fed other dietary treatments. The transformed Lactobacillus strains were found to reduce (P < 0.05) the time of feed passage rate by 2.2 h. Supplementation of transformed Lactobacillus strains to the diet improved the intestinal characteristics and feed, passage rate of the chickens.

Animal Feed↗
PubMed2000

Is lactobacillus GG helpful in children with Crohn's disease? Results of a preliminary, open-label study.

BACKGROUND: Lactobacillus GG is a safe probiotic bacterium known to transiently colonize the human intestine. It has been found to be useful in treatment of several gastrointestinal conditions characterized by increased gut permeability. In the current study, the efficacy of Lactobacillus GG was investigated in children with Crohn's disease. METHODS: In this open-label pilot evaluation viewed as a necessary preliminary step for a possible subsequent randomized placebo-controlled trial, four children with mildly to moderately active Crohn's disease were given Lactobacillus GG (10(10) colony-forming units [CFU]) in enterocoated tablets twice a day for 6 months. Changes in intestinal permeability were measured by a double sugar permeability test. Clinical activity was determined by measuring the pediatric Crohn's disease activity index. RESULTS: There was a significant improvement in clinical activity 1 week after starting Lactobacillus GG, which was sustained throughout the study period. Median pediatric Crohn's disease activity index scores at 4 weeks were 73% lower than baseline. Intestinal permeability improved in an almost parallel fashion. CONCLUSIONS: Findings in this pilot study show that Lactobacillus GG may improve gut barrier function and clinical status in children with mildly to moderately active, stable Crohn's disease. Randomized, double-blind, placebo-controlled trials are warranted for a final assessment of the efficacy of Lactobacillus GG in Crohn's disease.

Adolescent↗
PubMed1996

Lactobacillus panis sp. nov., from sourdough with a long fermentation period.

Two Lactobacillus strains isolated from rye sourdough most closely resemble Lactobacillus oris on the basis of their physiological, morphological, and chemotaxonomic characteristics. A 16S ribosomal DNA sequence analysis showed that these two strains clustered with, but were separate from, L. oris, Lactobacillus vaginalis, and Lactobacillus pontis. The results of DNA-DNA hybridization experiments indicated that the new two isolates represent a new Lactobacillus species, for which we propose the name Lactobacillus panis; strain DSM 6035T is the type strain of this species.

Base Sequence↗