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Microbial Ecology

Probiotic Lactobacillus plantarum 299v Does Not Counteract Unfavorable Phytohemagglutinin-Induced Changes in the Rat Intestinal Microbiota

Gabriele Gross, Jessica Wildner, Arjan Schonewille, Jan L. W. Rademaker, Roelof van der Meer, Johannes Snel
Gabriele Gross
1Department Health and Safety, NIZO food research, P.O. Box 20, 6710 BA Ede, The Netherlands
2Animal Breeding and Genomics Centre, Animal Sciences Group of Wageningen UR, P.O. Box 65, 8200 AB Lelystad, The Netherlands
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Jessica Wildner
1Department Health and Safety, NIZO food research, P.O. Box 20, 6710 BA Ede, The Netherlands
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Arjan Schonewille
1Department Health and Safety, NIZO food research, P.O. Box 20, 6710 BA Ede, The Netherlands
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Jan L. W. Rademaker
1Department Health and Safety, NIZO food research, P.O. Box 20, 6710 BA Ede, The Netherlands
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Roelof van der Meer
1Department Health and Safety, NIZO food research, P.O. Box 20, 6710 BA Ede, The Netherlands
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Johannes Snel
1Department Health and Safety, NIZO food research, P.O. Box 20, 6710 BA Ede, The Netherlands
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  • For correspondence: Hans.Snel@nizo.nl
DOI: 10.1128/AEM.00514-08
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ABSTRACT

Application of phytohemagglutinin (PHA) in weaning feed has been suggested to stimulate intestinal epithelium maturation. In this study, PHA strongly affected the fecal bacterial population structure of rats. Escherichia coli overgrowth was not prevented by probiotic mannose-adhering Lactobacillus plantarum 299v. Therefore, use of PHA in weaning feed deserves careful evaluation.

Plant lectins such as kidney bean-derived phytohemagglutinin (PHA) have gained renewed interest for potential use in animal feed and infant nutrition since a positive impact on weaning adaptation and gut health has been suggested based on stimulation of the functional maturation of the gastrointestinal tract of suckling rats and piglets (24, 25, 34, 39). In contrast, several detrimental effects of PHA on gut microbiota and physiology such as reduced growth rates, loss of body weight, diarrhea, and epithelial hyperplasia have been demonstrated in several species (4, 5, 12, 33).

Previously, PHA has been reported to dose dependently induce bacterial overgrowth in the intestine, which is associated with weight loss, malabsorption, and villus damage (2, 3). It has been suggested that PHA increases the turnover of epithelial cells, promoting the expression of mannosylated receptor glycans on the gut surface and thus leading to increased adhesion and subsequent proliferation of mannose-sensitive type 1-fimbriated Escherichia coli (31, 32). One would assume that based on this mechanism multiple bacterial strains besides E. coli that adhere to these additional receptor sites are stimulated by PHA. Therefore, the first aim of the present study was to investigate the influence of PHA on overall composition and dynamics of the intestinal and fecal microbiota of young adult rats. To this end, fragment length polymorphism analysis of the amplified 16S ribosomal terminal restriction fragment (T-RFLP) was performed and the 16S-23S ribosomal intergenic spacer (IGS) was evaluated, in addition to bacterial plate counts and real-time PCR quantification of exemplary bacteria.

In addition to E. coli, mannose-specific adhesion has been demonstrated for Lactobacillus plantarum, e.g., the probiotic strain 299v (1, 29). Addition of mannose-adhering probiotics may prevent disturbances of the intestinal microbiota like overgrowth of E. coli and could therefore contribute to an improved introduction of PHA in weaning feeds. Therefore, the second objective of the present study was to assess whether an orally administered mannose-adhering L. plantarum strain could prevent E. coli stimulation in the PHA-affected rat intestine by mannose-specific competitive exclusion and thereby counteract the adverse effects of PHA.

Crude red kidney bean extract containing PHA was purchased from the Laboratory of Biochemistry and Glycobiology at the University of Ghent, Belgium. It was isolated from Phaseolus vulgaris basically according to the method of Pusztai et al. (32).

Specific-pathogen-free male Wistar rats (WU, Harlan, Horst, The Netherlands), eight per group, 8 weeks old, were housed individually in metabolic cages as described earlier (38). All animals were supplied ad libitum with demineralized drinking water and a purified standard diet basically according to the work of Reeves et al. (36) with a high fat (200 g/kg of body weight) and calcium (17.2 g/kg CaHPO4·2H2O) content. Food intake and body weight were recorded daily. The experimental protocol was approved by the animal welfare committee of Wageningen University, The Netherlands.

Animals were acclimated to housing and dietary conditions for 8 days. Starting from day 9, animals were daily additionally fed with 3 g vanilla custard mix containing two-thirds-weight vanilla custard (vanilla vla; De Zaanse Hoeve, Albert Heijn, Zaandam, The Netherlands) and either one-third-weight DeMan-Rogosa-Sharpe broth (MRSB) (Merck, Amsterdam, The Netherlands) or one-third-weight MRSB containing approximately 1010 CFU/ml L. plantarum 299v (NIZO B2260; bacterial counts were confirmed by plating), grown at 37°C overnight in MRSB under anaerobic conditions.

On days 11 and 12, 0.5 ml physiological salt solution with red kidney bean extract containing 33 mg PHA was orally administered to all animals by gastric gavage twice daily. A smaller group of animals (n = 3) that received 0.5 ml physiological salt solution without PHA and custard mix without L. plantarum 299v supplementation was included for reference values. On day 13, animals were sacrificed by carbon dioxide inhalation, and samples from jejunum and ileum were excised for microbiological analyses of lactobacillus and E. coli counts. Serial dilutions of fresh, homogenized fecal or intestinal samples in physiological salt solution were plated on Rogosa (Oxoid, Basingstoke, Hampshire, United Kingdom) and eosin methylene blue-Levine (Merck) agar plates. CFU counts were determined after incubation at 37°C for 24 (eosin methylene blue) or 48 (Rogosa; under anaerobic conditions) hours, respectively.

Fecal samples were collected quantitatively 2 days before and during PHA administration, pooled per 2 days, freeze-dried, and ground. DNA extraction from these samples was performed using the QIAamp DNA stool minikit (Westburg, Leusden, The Netherlands) preceded by bead beating (40). DNA was subsequently subjected to DNA fingerprinting methods and quantitative real-time PCR. T-RFLP analysis of the 16S ribosomal gene was carried out essentially as described earlier (35). Briefly, Taq PCRs were performed with DNA extracts from rat feces and bacterial reference strains as a template and the labeled eubacterial primers 8-27F and SD-BACT-0926. After gel electrophoresis, the amplified fluorescently labeled fragments were purified, digested overnight with HaeIII and HhaI, purified again, and mixed with Hi-Di-formamide (Applied Biosystems) and rhodamine X-labeled DNA Map Marker 1000 (Bioventures, Murfreesboro, TN). Subsequently, DNA was denatured, cooled to 4°C, and subjected to electrophoresis using an ABI Prism 310 Genetic Analyzer equipped with a capillary filled with Performance Optimized Polymer 4 matrix (Applied Biosystems). Peak profiles were collected using GeneScan 6.7 software (Applied Biosystems) and analyzed using BioNumerics 4.00 (Applied Maths, Sint-Martens-Latem, Belgium). Forward and reverse terminal fragment lengths of the pure reference strains were predicted using the web-based TAP T-RFLP tool provided by the Ribosomal Database Project II, release 8.1 (26). Additionally, the copy number of rRNA operons of 16S rRNA was ascertained with the online database described by Klappenbach et al. (23).

Fluorescent 16S-23S ribosomal IGS analysis of DNA samples was performed using universal eubacterial primers FgPL132 and FgPS1490 (28), with FgPL132 5′ end labeled with VIC (Applied Biosystems) in the initial PCR. Purification of PCR products, preparation of samples, and further analysis were mainly performed as described above for T-RFLP.

Interpretation of the population fingerprint profiles was facilitated by comparison with peak profiles of bacterial reference strains selected according to the main interest of this study. L. plantarum 299v (NIZO B2260), Lactobacillus acetotolerans (NIZO B1529), Lactobacillus casei subsp. paracasei (NIZO B1125), Lactobacillus reuteri (NIZO B1534), Lactobacillus acidophilus (NIZO B1532), and Lactobacillus animalis (NIZO B1530), all isolated from human intestine or rat feces, were obtained from the NIZO culture collection. Four bacterial isolates (lactic acid bacterium [NIZO B2380], E. coli [NIZO B2384], and Enterobacteriaceae strains [NIZO B2383 and NIZO B2386]) with distinct morphologies were recovered from plating of rat fecal samples from this study as described above and stored as frozen glycerol stocks. Lactic acid bacteria were cultured in MRSB or skim milk (BD Difco, Alphen aan den Rijn, The Netherlands), and Enterobacteriaceae strains were grown in brain heart infusion broth (Merck), all at 37°C. DNA of the bacterial reference strains was extracted using InstaGene Matrix (Bio-Rad Laboratories, Hercules, CA). The predicted and observed terminal restriction fragment (TRF) sizes of the reference strains confirmed the identity of these strains, although fragment lengths differed for up to 5 bp in most cases (data not shown). However, comparable variations have also been reported in other studies (7).

Numbers of E. coli and L. plantarum bacteria in freeze-dried fecal samples were also quantified using real-time PCR with specific 16S rRNA-targeted primers, mainly as described by Huijsdens et al. (16) and Bron et al. (6), respectively, using diluted DNA extracts from rat fecal samples. Standard curves were prepared from DNA isolated from liquid cultures of E. coli strain ATCC JM109 and L. plantarum 299v, respectively.

To illustrate the degree of diarrhea by determination of percent dry weight, lyophilized fecal material was reconstituted with distilled water to 20% dry weight. After homogenization, samples were incubated for 1 h at 37°C, with mixing every 15 min, followed by centrifugation at 13,500 × g at 37°C for 20 min. The supernatant was centrifuged for 2 min, and osmolarity was measured (Osmomat 030-D; Gonotec, Berlin, Germany). Assuming an osmolarity of intestinal contents of 300 mosmol/liter, even in the diarrheal state (11), the dry weight of fecal samples was calculated.

Results of measurements of physiological parameters and of bacterial counts obtained by microbiological and real-time PCR analyses are expressed as mean values ± standard errors of the means. Differences between the results of control and treatment groups were tested for significance using Student's t test (two sided, considered statistically significant when P < 0.05).

PHA-induced shifts in rat intestinal microbial populations.

The present study proves the applicability of T-RFLP and 16S-23S IGS analyses to characterize microbial communities in rat feces. These molecular fingerprint analyses showed clearly that PHA administration induced changes in intestinal bacterial population structure (Fig. 1 and 2) and resulted in an increased diversity of the predominant intestinal microbiota (Fig. 1 and 2, arrows). In other studies, the effect of kidney beans or PHA on E. coli was most pronounced, but also increases of Streptococcus sp., bifidobacteria, and, not consistently, Lactobacillus have been reported in rats (3, 5, 10, 32).

FIG. 1.
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FIG. 1.

16S-23S ribosomal IGS analysis from individual animals (rows). Profiles are grouped according to experimental conditions and illustrate the effect of PHA on rat fecal microbial community structure. Amplified spacer fragments that were found to be specifically affected by PHA treatment are indicated with white arrows. Bands of the reference strains matching those found to be different among the rat fecal profiles are circled. ROX, rhodamine X.

FIG. 2.
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FIG. 2.

HhaI forward T-RFLP analysis from individual animals (rows). Profiles are grouped according to experimental conditions. Bands from L. plantarum 299v and E. coli reference profiles can be recognized in the fecal profiles. TRFs that were found to be specifically affected by PHA treatment are indicated with white arrows; fragments specifically found after L. plantarum supplementation are marked with a black arrow. Bands of the reference profiles matching those found to be different among the rat fecal profiles are circled. ROX, rhodamine X.

Among animals within a diet group, compositions of the microbiota were found to be similar. Increased numbers of fecal E. coli, lactic acid bacteria, and other Enterobacteriaceae were observed during PHA administration for almost all animals (Fig. 1 and 2, circles). The stimulation of E. coli indicated by the population profiles is in line with previously described effects of PHA (32) and was confirmed by E. coli-specific real-time PCR (Table 1; P = 0.00005). Furthermore, increased bacterial counts of E. coli in jejunal samples and of lactobacilli in ileal samples were determined during PHA administration compared to those of animals that had not received PHA (Table 2).

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TABLE 1.

Bacterial numbers assessed in this study in fecal samples before (days 9 and 10) and during (days 11 and 12) PHA administration, as determined by E. coli- and L. plantarum-specific real-time PCRc

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TABLE 2.

Bacterial numbers assessed in this study in intestinal samples on day 13, after 2 days of PHA administration, as determined by plating of serial dilutions on appropriate agar plates

The comparison of the two fingerprinting methods revealed that the general effects of PHA on intestinal microbial populations could clearly be visualized by 16S-23S IGS fragment length analysis but that the more complex peak profiles of T-RFLP were more powerful in the identification of particular species.

Effects of L. plantarum supplementation on PHA-affected rat intestinal microbial populations.

The HhaI forward-TRF fingerprints support the presence of L. plantarum in the samples of animals that received the L. plantarum-supplemented diet, since fragments could be detected that matched with corresponding L. plantarum-specific bands from the reference profile (Fig. 2), which was confirmed by macroscopically identical colony morphologies of the two isolates. Plating of fecal samples collected on day 11, before PHA administration, indicated that lactobacillus counts were higher in animals receiving L. plantarum (9.9 ± 0.1 log10 CFU/g) than in the control group (7.2 ± 0.4 log10 CFU/g) (P = 0.00001). (E. coli counts were 7.7 ± 0.2 and 7.9 ± 0.1 log10 CFU/g for the groups fed the standard diet and the L. plantarum-supplemented diet, respectively. There were eight samples in each group.) Furthermore, increased numbers of L. plantarum in feces of animals fed with this strain during PHA administration were detected by real-time PCR (Table 1, P = 2.6 × 10−18). These findings indicate that L. plantarum 299v is able to survive gastrointestinal passage as described earlier (13, 19) and to become part of the predominant fecal microbiota. Also in other studies, probiotic Lactobacillus strains could be tracked in T-RFLP analyses (9, 17, 22). Here, L. plantarum was also detected in fecal samples of control rats, although in lower numbers. This suggests that L. plantarum is a natural inhabitant of the intestinal tract not only of humans (27) but also of rats.

Despite the abundant presence of L. plantarum 299v in the fecal microbiota, no relevant inhibition could be observed of the PHA-induced increase of E. coli or other PHA-affected bacterial species according to the population fingerprint profiles. Basal fecal E. coli counts and the PHA-induced increase in numbers of E. coli bacteria compared to those in rats receiving the standard diet were not altered by L. plantarum supplementation (see above). PHA administration led to increased bacterial counts of both E. coli and lactobacilli in intestinal samples also in animals that received L. plantarum supplementation (Table 2). Interestingly, the number of E. coli bacteria in ileal samples after PHA administration tended to be lower in animals fed L. plantarum than in the control group (P = 0.13); the number detected was comparable to that of animals without PHA administration. However, these results contradict the findings of De Waard (8), who reported that 3 or 10 days of oral L. plantarum 299v administration prior to ingestion of the same or even a higher dose of PHA for 3 days reduced bacterial overgrowth of coliforms and loss of body weight in rats. This discrepancy might have been caused by differences in diet resulting in a higher level of E. coli in the current study, which was subsequently multiplied by PHA treatment. The results presented here support studies showing that consumption of L. plantarum 299v and other probiotic strains hardly influenced human intestinal microbiota composition (9, 14, 37). Contrasting findings indicating effects of L. plantarum 299v on other bacterial species in intestinal or fecal samples might be explained by mechanisms other than competition for adhesion sites or the use of gnotobiotic animals lacking endogenous microbiota (15, 18). Since supplementation with L. plantarum did not increase lactobacillus counts in intestinal samples (Table 2), it can be concluded that L. plantarum did not colonize the intestinal mucosa and therefore could not prevent E. coli overgrowth based on competitive exclusion.

Effect of PHA on physiological parameters and influence of L. plantarum on PHA-induced physiological changes.

After administration of PHA, collection of fresh fecal samples was no longer possible because samples were too watery. Calculated percentages of dry weight in feces, food intake, and accordingly body weight of the animals decreased rapidly (Table 3). Reference animals without PHA administration did not display a corresponding reduction of food intake and body weight (data not shown). L. plantarum supplementation did not have a significant effect on any of these physiological changes caused by PHA.

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TABLE 3.

Physiological parameters before (days 9 and 10) and during (days 11 and 12) PHA administrationd

Dietary application of PHA is of interest not only in the context of weaning adaptation but also with respect to cancer treatment and the prevention of gastrointestinal atrophy during parenteral nutrition (20, 21, 30). A combination of PHA and dietary factors that prevent the adverse effects of PHA might be beneficial. Alternatively to probiotics, other dietary means could be selected since, e.g., GNA, a lectin from snowdrop (Galanthus nivalis) has been shown to suppress PHA-induced E. coli overgrowth in rat small intestine via competition for mannose-binding sites in vivo (32). Notably, in the current study a comparably high dosage of PHA was applied to maximize the effect of PHA on the intestinal microbiota and to create a wide range for probiotic intervention.

In conclusion, the present study demonstrates that the effects of dietary PHA extend beyond a specific stimulation of E. coli. The adverse effects of PHA on gut physiology could not be counteracted by mannose-adhering L. plantarum 299v. Its impact on the composition of the intestinal microbiota indicates that a dose of PHA comparable with that used in this study is not advisable for nutritional applications.

ACKNOWLEDGMENTS

This work has been supported by the Centre for Human Nutrigenomics, The Netherlands.

We thank Jan Hoolwerf (NIZO food research) for excellent technical advice on molecular fingerprinting techniques.

FOOTNOTES

    • Received 3 March 2008.
    • Accepted 24 June 2008.
  • Copyright © 2008 American Society for Microbiology

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Probiotic Lactobacillus plantarum 299v Does Not Counteract Unfavorable Phytohemagglutinin-Induced Changes in the Rat Intestinal Microbiota
Gabriele Gross, Jessica Wildner, Arjan Schonewille, Jan L. W. Rademaker, Roelof van der Meer, Johannes Snel
Applied and Environmental Microbiology Aug 2008, 74 (16) 5244-5249; DOI: 10.1128/AEM.00514-08

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Probiotic Lactobacillus plantarum 299v Does Not Counteract Unfavorable Phytohemagglutinin-Induced Changes in the Rat Intestinal Microbiota
Gabriele Gross, Jessica Wildner, Arjan Schonewille, Jan L. W. Rademaker, Roelof van der Meer, Johannes Snel
Applied and Environmental Microbiology Aug 2008, 74 (16) 5244-5249; DOI: 10.1128/AEM.00514-08
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  • Top
  • Article
    • ABSTRACT
    • PHA-induced shifts in rat intestinal microbial populations.
    • Effects of L. plantarum supplementation on PHA-affected rat intestinal microbial populations.
    • Effect of PHA on physiological parameters and influence of L. plantarum on PHA-induced physiological changes.
    • ACKNOWLEDGMENTS
    • FOOTNOTES
    • REFERENCES
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KEYWORDS

Escherichia coli
Intestinal Mucosa
Lactobacillus plantarum
Phytohemagglutinins
probiotics

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