Alma Mater Studiorum - University of Bologna Ph.D Course in Agricultural, Environmental and Food Science and Technology Curriculum: Microbial Ecology and Plant Pathology - Cycle XXVII The role of bifidobacteria in newborn health and the intestinal microbial balance Presented by: Giuseppe Mazzola Advisor: Prof. Diana Di Gioia Co-Advisor: Dr. Irene Aloisio 8 th May 2015
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Alma Mater Studiorum - University of Bologna
Ph.D Course in Agricultural, Environmental and Food Science and Technology
Curriculum: Microbial Ecology and Plant Pathology - Cycle XXVII
The role of bifidobacteria in newborn health and the intestinal microbial balance
Presented by: Giuseppe Mazzola
Advisor: Prof. Diana Di Gioia
Co-Advisor: Dr. Irene Aloisio 8th May 2015
Gut microbial colonization in the early stage of life
Birth• Sterility?
First days• Enterobacteria• Enterococci• Bifidobacteria• Bacteroides• Clostridia
MC = control microbiota cultures. 5mL of fecal suspension
T0 = B632 colonies were 85% of the total bifidobacterial coloniesT6 = B632 colonies were 73%T24 = B632 colonies were 64%
Anti-colics activityB632 did not influence the total bacteria growth in PMC
Enterobacteriaceae were affected in PMC
Bifidobacteria resulted more abundant in PMC than MC
E. coli did not decrease in PMC
FISH:
MC PMC
q-PCR:
RAPD-PCR
Potential applications of the bifidobacteria strains: anti-Streptococcus
Antimicrobial activity of the Bifidobacterium spp. strains against Streptococcus agalactiae
Antagonistic strains:-S. agalactiae DSM2134T
-3 S. agalactiae strains (from vaginal swabs)
Antagonistic strains:-S. agalactiae DSM2134T
-3 S. agalactiae strains (from vaginal swabs)
Bifidobacterium overnight-cultures
Inibition evaluation(halo’s radius)
SPOT AGAR TEST:
Radius measured ≥ 1cm
Radius measured ≤ 0.5cm
Conclusion
The first part of this work pointed out:
1. B. breve B632 strain is a good candidate for pediatric use;2. The fructooligosaccharide (Actilight®950P) and the galactooligosaccharide (Vivinal®) are able to stimulate selectively the growth of B. breve B632 and are appropriate for a synbiotic product targeted to infants.
Next goal:
Validation in vivo of the effects of the selected probiotic (ON-GOING)
Preparation of the synbiotic product and validation in vivo
B. Achievements of new insights on early gut microbial colonization
Impact of intrapartum antibiotic prophylaxis (IAP) on the newborn gut colonization: study design
DNA processingCharacteristics:•Control (not IAP mothers)•Treated (IAP mothers)•7 and 30 days old•Breast/formula/ mixed feed•Healty•At term•Vaginally delivered•Not antibiotics•Not pro/prebiotics
M
Infants at 7 days of life: microbial quantification by q-PCR
• Intrapartum antibiotic prophylaxis (IAP) plays an important part in the prevention of GBS infections
• Infant recruitment:- 26 newborns born to GBS positive/IAP
treated mothers (IAP group)- 26 newborns born to GBS negative
mothers (Control group)
Aloisio et al., 2014
Decrease of Bidobacterium after IAP: 7.29 Log (CFU/g) in control samples vs.5.85 Log (CFU/g) in IAP samples (P<0.05)
No differences for Lactobacillus, E. coli, C. difficile, Bacteroides fragilis
Great variability in microbial composition in newborns
Infants at 7 days of life: PCR-DGGE assay
PCR amplification:•Bifidobacterium genus-specific PCR primers Bif164-F and Bif662-R targeted on the 16S rRN
Denaturing gradient gel electrophoresis:•DGGE gel 7% (w/v) polyacrylamide in 1X Tris-acetate-EDTA (TAE)•Denaturing gradient of 50 to 55% urea-formamide
Reference ladder
B. breve
B. bifidum
B. longum subsp. infantis /longum
B. pseudocatenulatum
DGGE analysis:•Identification of unknown bands by comparing the migrant distances;•Identity was confirmed or detected by cutting and sequencing of some of the bands
Exemplificative fingerprinting
Lower level of diversity in IAP with respect to Control
Infants at 7 days of life: PCR-DGGE assay
B. pseudolongum, B. pseudocatenulatum, B. longum were not influenced by IAP
Strong decrement in frequency of B. breve and B. bifidum (50% Control vs 25% IAP)
Decrement in frequency of B. dentium (38% Control vs 13% IAP)
Decrement in both BF-IAP and MF-IAP infants compared to Control infants
Increment in both BF-IAP and MF-IAP infants
16S rRNA sequencing of the variable V3 and V4 region
• Primers with overhang adapters
• Multiplexing indices
• Normalization and pooling
• Loading on the Illumina MiSeq platform
• Sequencing: recording the synthesis of DNA
strands in clusters of sample templates. Each
newly attached base liberates a fluorescent dye
that is excited by diode lasers (530 & 660 nm)
and imaged using two digital cameras.
16S Amplicon Sequencing Workflow
> 11 milion raw sequences
≈ 200,000 reads per sample
High-throughput pyrosequencing: results
Significant lower diversity in BF-IAP infants compared with BF-C Lower diversity in BF-IAP infants compared with MF-IAP (not statistically significant)
Alpha diversity at 7 days
Higher abundance of Enterobacteriaceae and lower of Bifidobacteria in BF-IAP compared to BF-C
Enterobacteriaceae continue to dominate in BF-IAP infants compared to BF-C
Conclusion
General Conclusion
Main achievements:
B. breve B632, as lyophilized strain or in a microencapsulated form, is a good candidate for a probiotic product for the prevention or relieve of infant disorders such as gas colics or streptoccoccal infections
the FOS Actilight®950P and the GOS Vivinal® are capable of selectively stimulating the probiotic B. breve B632 strain and are therefore suitable ingredients for a synbiotic product targeted to infants
Intrapartum antibiotic prophylaxis (IAP) has a negative impact toward the early intestinal colonization, in particular towards Bifidobacterium spp.
Papers related to my Ph.D work:1.M Simone, C Gozzoli, A Quartieri, G Mazzola, D Di Gioia, A Amaretti, S Raimondi, and M Rossi (2014) The probiotic Bifidobacterium breve B632 inhibited the growth of Enterobacteriaceae within colicky infant microbiota cultures. BioMed Research International Vol. 2014, Article ID 301053, 7 p.;2.D Di Gioia, I Aloisio, G Mazzola, B Biavati (2014) Bifidobacteria: their impact on gut microbiota composition and their applications as probiotics in infants. Applied Microbiology and Biotechnology 98:563–577;3.I Aloisio, G Mazzola, L T Corvaglia, G Tonti, G Faldella, B Biavati, D Di Gioia (2014) Influence of intrapartum antibiotic prophylaxis against group B Streptococcus on the early newborn gut composition and evaluation of the anti-Streptococcus activity of Bifidobacterium strains. Applied Microbiology and Biotechnology 98:6051-6060;4.G Mazzola, I Aloisio, D Di Gioia (2014) Infant development, currently the main applications of probiotics and prebiotics? In: Venema K. and do CarmoA. P. (eds) Probiotics and Prebiotics: Current Research and Future Trends. Caister Academic Press, Wageningen, chapter 26;5.G Mazzola, I Aloisio, B Biavati, D Di Gioia / Development of a synbiotic product for newborns and infants / Submitted to Food Science and Technology;6.L Corvaglia, G Tonti, S Martini, A Aceti, G Mazzola, I Aloisio, D Di Gioia, G Faldella / Influence of intrapartum antibiotic prophylaxis for Group B Streptococcus and type of feeding on gut microbiota during the first month of life / Under submission;7.G Mazzola, K Murphy, R P Ross, D Di Gioia, L Corvaglia, G Faldella, C Stanton / Early gut microbiota perturbations following intrapartum antibiotic prophylaxis to prevent group B streptococcal disease/ Under submission
Other papers:1.G Mazzola, I Stefanini, I Nikodinoska, B Melero, J Rovira, T Langerholc, M Rossi, B Biavati, D Di Gioia / Use of lactic acid bacteria as protective cultures in pork meat batter to prevent Clostridium spp. growth / Work in preparation;2.G Totaro, L Paltrinieri, G Mazzola, M Vannini, La Sisti, C Gualandi, A Ballestrazzi, S Valeri, A Pollicino, A Celli, D Di Gioia, M L Focarete / Electrospun fibers containing bio-based poly(ricinoleic acid): effect of ricinoleic acid units amount and distribution on antibacterial properties / Work in preparation;3.G Totaro, L Cruciani, M Vannini, G Mazzola, D Di Gioia, A Celli, L Sisti (2014) Synthesis of castoroil-deliveredpolyesters with antimicrobial activity. European Polymer Journal 56:174-184