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Impaired mucus-bica...
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Henriksnäs, JohannaUppsala universitet,Institutionen för medicinsk cellbiologi
(författare)
Impaired mucus-bicarbonate barrier in Helicobacter pylori-infected mice
- Artikel/kapitelEngelska2006
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American Physiological Society,2006
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Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:uu-22678
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-22678URI
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https://doi.org/10.1152/ajpgi.00017.2006DOI
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http://kipublications.ki.se/Default.aspx?queryparsed=id:112231563URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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To resist the harsh intrinsic milieu, several lines of defense exist in the stomach. The aim of this study was to investigate the effect of the gastric pathogen Helicobacter pylori on these mechanisms in vivo. We used FVB/N mice expressing human alpha-1,3/4-fucosyl transferase ( producing Lewis b epitopes) and inoculated with H. pylori 1. Mice were anesthetized with isoflurane or Hypnorm-midazolam, the stomach was exteriorized, and the surface of the corpus mucosa was exposed. Mucus thickness was measured with micropipettes, juxtamucosal pH (pH(jm)) was measured with pH-sensitive microelectrodes, blood flow was measured with laser-Doppler flowmetry, and mRNA levels of the bicarbonate transporter SLC26A9 were quantified with real-time PCR. The increase in mucosal blood flow seen in response to luminal acid (pH 1.5) in control animals (140 +/- 9% of control) was abolished in infected mice. The firmly adherent mucus layer was significantly thinner in infected mice (31 +/- 2 mu m) than in control mice (46 +/- 5 mu m), and no mucus accumulation occurred in infected mice. pHjm decreased significantly more on exposure to luminal acid in infected mice ( luminal pH 1.5, pH(jm) 2.4 +/- 0.7) than in control mice (pH(jm) 6.4 +/- 0.5). Despite reduced pHjm, SLC26A9 mRNA expression was significantly, by increased 1.9-fold, in infected mice. The reduction in pH(jm) by infection with H. pylori might be due to a reduced firmly adherent mucus layer, increased mucus permeability to H+, and/or inhibition of bicarbonate transport. The upregulation of SLC26A9 in H. pylori-infected epithelium might be a result of continuous inhibition of the transporter, e. g., by ammonium, a H. pylori product, which has been previously shown to inhibit SLC26A9.
Ämnesord och genrebeteckningar
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juxtamucosal pH
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blood flow
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laser-Doppler flowmetry
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permeability
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MEDICINE
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MEDICIN
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Phillipson, MiaUppsala universitet,Institutionen för medicinsk cellbiologi(Swepub:uu)mjo07958
(författare)
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Storm, Martin
(författare)
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Engstrand, LarsKarolinska Institutet
(författare)
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Soleimani, Manoocher
(författare)
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Holm, LenaUppsala universitet,Institutionen för medicinsk cellbiologi(Swepub:uu)pho23887
(författare)
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Uppsala universitetInstitutionen för medicinsk cellbiologi
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:American Journal of Physiology - Gastrointestinal and Liver Physiology: American Physiological Society291:3, s. G396-G4030193-18571522-1547
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