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Lactobacillus and Bifidobacterium species do not secrete protease that cleaves the MUC2 mucin which organises the colon mucus.

Författare och institution:
Durai B Subramani (Institutionen för biomedicin); Malin E V Johansson (Institutionen för biomedicin, avdelningen för medicinsk kemi och cellbiologi); Gunnar Dahlén (Institutionen för odontologi); Gunnar C. Hansson (Institutionen för biomedicin, avdelningen för medicinsk kemi och cellbiologi)
Publicerad i:
Beneficial microbes, 1 ( 4 ) s. 343-50
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
The colon epithelium is covered by two layers of mucus built around the MUC2 mucin. An inner dense and attached mucus layer does not allow bacteria to penetrate, thus keeping the epithelial cell surface free from bacteria. An outer loose mucus layer is the habitat for the commensal bacterial microbiota. The inner mucus layer is renewed from the epithelial side and gets converted into the outer layer due to proteolytic cleavages by host proteases. We have now analysed if potential probiotic bacteria, namely Lactobacillus brevis, Lactobacillus plantarum, Lactobacillus bulgaricus and Bifidobacterium lactis, can secrete protease that cleaves the MUC2 mucin. We found that none of the potential probiotic bacteria Lactobacillus and Bifidobacterium could cleave the MUC2 core protein in the form of recombinant MUC2 N and C-termini although they secreted active proteases. This was in contrast to crude mixtures of oral and faecal bacteria that cleaved the MUC2 mucin. This observation further supports the view that these potential probiotic bacteria are of no harm to the host, as these bacteria cannot disrupt the mucin organised mucus as long as they are covered by glycans.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Medicinska grundvetenskaper ->
Medicinska grundvetenskaper ->
Mikrobiologi inom det medicinska området
Animals, Bacterial Proteins, genetics, metabolism, Bifidobacterium, enzymology, genetics, isolation & purification, Cell Line, Colon, metabolism, microbiology, Extracellular Space, enzymology, genetics, Humans, Intestinal Mucosa, metabolism, microbiology, Lactobacillus, enzymology, genetics, isolation & purification, Mice, Mucin-2, chemistry, genetics, metabolism, Peptide Hydrolases, genetics, metabolism, Protein Processing, Post-Translational, Protein Structure, Tertiary
Postens nummer:
Posten skapad:
2011-12-15 08:29
Posten ändrad:
2012-07-31 14:05

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