Community analysis of bacteria colonizing intestinal tissue of neonates with necrotizing enterocolitis

BMC Microbiology

Lars Mølbak³  Karen A Krogfelt⁵  Mette Boyé³  Julie Kloppenborg⁴  Christian Pipper²  Tim K Jensen³  Bodil L Petersen⁴  Susan Bodé¹  Birgitte Smith⁵ 

[1] Neonatel Department 5023, Rigshospitalet, Blegdamsvej, 2100 Kbh. Ø, Denmark;Faculty of Life Sciences, University of Copenhagen, Bülowsvej 17, 1870 Frb., Denmark;National Veterinary Institut- DTU, Bülowsvej 27, 1790 Copenhagen V, Denmark;Pathologic Institut, Rigshospitalet, Blegdamsvej, 2100 Kbh. Ø, Denmark;Statens Serum Institut, Artillerivej 5, 2300 Kbh. S, Denmark

关键词: Ralstornia;    pneumatosis intestinalis;    necrotizing enterocolitis;    microbiota;    laser capture microdissection;    FISH;   

Others  :  1225264
DOI  :  10.1186/1471-2180-11-73

 received in 2010-10-08, accepted in 2011-04-12,  发布年份 2011

【 摘 要 】

Background

Necrotizing enterocolitis (NEC) is the most common gastrointestinal emergency in newborn neonates. Bacteria are believed to be important in the pathogenesis of NEC but bacterial characterization has only been done on human faecal samples and experimental animal studies. The aim of this study was to investigate the microbial composition and the relative number of bacteria in inflamed intestinal tissue surgically removed from neonates diagnosed with NEC (n = 24). The bacterial populations in the specimens were characterized by laser capture microdissection and subsequent sequencing combined with fluorescent in situ hybridization (FISH), using bacterial rRNA-targeting oligonucleotide probes.

Results

Bacteria were detected in 22 of the 24 specimens, 71% had moderate to high densities of bacteria. The phyla detected by 16S rRNA gene sequencing were: Proteobacteria (49.0%), Firmicutes (30.4%), Actinobacteria (17.1%) and Bacteroidetes (3.6%). A major detected class of the phylum Proteobacteria belonged to δ-proteobacteria. Surprisingly, Clostridium species were only detected in 4 of the specimens by FISH, but two of these specimens exhibited histological pneumatosis intestinalis and both specimens had a moderate to a high density of C. butyricum and C. parputrificum detected by using species specific FISH probes. A 16S rRNA gene sequence tag similar to Ralstonia species was detected in most of the neonatal tissues and members of this genus have been reported to be opportunistic pathogens but their role in NEC has still to be clarified.

Conclusion

In this study, in situ identification and community analysis of bacteria found in tissue specimens from neonates with NEC, were analysed for the first time. Although a large variability of bacteria was found in most of the analyzed specimens, no single or combination of known potential pathogenic bacteria species was dominating the samples suggestive NEC as non-infectious syndrome. However there was a significant correlation between the presence of C. butyricum & C. parputrificum and histological pneumatosis intestinalis. Finally this study emphasizes the possibility to examine the microbial composition directly on excised human tissues to avoid biases from faecal samples or culturing.

【 授权许可】

   
2011 Smith et al; licensee BioMed Central Ltd.

【 图 表 】

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