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Effect of acute mucosal exposure to Lactobacillus rhamnosus GG on human colonic smooth muscle cells.

Abstract：

AIM:To define whether human colonic mucosa exposure to Lactobacillus rhamnosus GG (LGG), American Type Culture Collection (ATCC) 53103, may influence intestinal muscle cell contractility. METHODS:Human colon specimens were obtained from disease-free margins of resected segments for cancer. The mucosa and submucosa, after dissection, were sealed between 2 chambers, with the luminal side of the mucosa facing upward and covered with 5 mL of Krebs solution and the submucosal side facing downward into 20 mL of Krebs solution. LGG or normal undernatant (N-undernatant) were added to the luminal side of the mucosa for 30 minutes. Smooth muscle cells (SMCs), isolated from the circular muscle layer, were exposed to undernatant for 30 minutes from the submucosal chamber of mucosa that was either preexposed to N-undernatant or to LGG (36 x 10(-9) colony forming units/mL) (LGG-undernatant). Acetylcholine (Ach) dose-response was obtained for SMCs. RESULTS:SMCs exposed to N-undernatant presented a dose-response to Ach (maximal contraction: 32%+/-5% with 1-muM Ach) that is similar to unstimulated SMCs. Exposure to LGG-undernatant resulted both in an 18%+/-3% cell shortening and a 78%+/-7% inhibition of maximal Ach-induced contraction. When SMCs were directly exposed to LGG, a significant impairment of contraction (70%+/-5%, compared with control cells) and a dose-dependent and time-dependent shortening were observed. CONCLUSIONS:After acute exposure of colonic mucosa to LGG, a significant shortening of SMCs is observed that possibly contributes to the reduced contractile response to Ach. Further studies are needed to establish the mechanisms of this effect that could account for the clinical efficacy of probiotics in intestinal disorders.

journal_name

J Clin Gastroenterol

journal_title

Journal of clinical gastroenterology

authors

Guarino MP,Altomare A,Stasi E,Marignani M,Severi C,Alloni R,Dicuonzo G,Morelli L,Coppola R,Cicala M

doi

10.1097/MCG.0b013e31817e1cac

subject

Has Abstract

pub_date

2008-09-01 00:00:00

pages

S185-90

eissn

0192-0790

issn

1539-2031

journal_volume

42 Suppl 3 Pt 2

pub_type

杂志文章

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Effect of acute mucosal exposure to Lactobacillus rhamnosus GG on human colonic smooth muscle cells.