Navigation Links
How do Lactobacilli treat Helicobacter pylori-related diseases?
Date:9/9/2008

Some studies have demonstrated H. pylori stimulates the release of interleukin-8 (IL-8) from gastric epithelia, which initiates inflammatory damage to gastric mucosa and plays a crucial role in the pathogenesis of H. pylori infections. H. pylori lipopolysaccharide (H. pylori-LPS) is the major initiator in H. pylori-induced IL-8 production via activation of Toll-like receptor 4 (TLR4) pathway in gastric epithelia. Considering the novel finding that H. pylori is an indigenous biota in gastric microflora including Lactobacilli and hypothesis that the disturbance of gastric microecosystem plays a more important role in pathogenetic mechanisms of H. pylori, the eradiation of H. pylori doesn't seem justified to everyone. The speculation on validity of restoration of the gastric microecosystem has been demonstrated by therapeutic effects of Lactobacilli administration on H. pylori-associated diseases. But whether Lactobacilli inhibit H. pylori-LPS-induced IL-8 production through blocking H. pylori-LPS-activated TLR4 pathway hasn't been well researched.

A research article to be published on August 28, 2008 in the World Journal of Gastroenterology addresses this question. The research team led by Prof. Hong-Sheng Ma from West China Hospital of Sichuan University treated SGC-7901 cells with H. pylori Sydney strain 1 lipopolysaccharide (H. pyloriSS1-LPS) in the absence or presence of a pretreatment with viable Lactobacillus bulgaricus (LBG). The results indicated that viable LBG prevented H. pyloriSS1-LPS-activated TLR4 pathway in SGC-7901 cells, leading to its inhibitory effect on IL-8 production stimulated by H. pyloriSS1-LPS. Considering some evidence implied that supernatant recovered from Lactobacilli culture MRS broth contained some latent soluble proteins secreted by Lactobacilli, SGC-7901 cells were treated with H. pyloriSS1-LPS in the absence or presence of a pretreatment with supernatant recovered from LBG culture MRS broth (LBG-S). It was demonstrated that LBG-S had the same inhibitory effect on H. pyloriSS1-LPS-activated TLR4 signaling transduction as viable LBG. In a recent novel study, two soluble proteins with molecular sizes of 75 and 40 kDa were purified from supernatant recovered from Lactobacillus rhamnosus GG culture MRS broth and named p75 and p40 respectively, which ameliorated apoptosis of intestinal epithelia treated with tumor necrosis factor α, interferon-γ or IL-1α and promoted cell growth through activating Akt and blocking p38 mitogen-activated protein kinase and stress-activated protein kinase/c-Jun amino-terminal kinase signaling. So LBG-S in this experiment probably contained the similar or even same proteins, which could intervene in H. pyloriSS1-LPS-activated TLR4 signaling through modulating other pathways in SGC-7901 cells.

This evaluation of LBG as a probiotic model revealed an important and novel relationship between H. pylori-LPS-activated TLR4 signaling and selective microflora. This report adds to our understanding of the signal pathways in the gastric epithelia involved in inflammatory responses that are regulated by probiotics and pathogenic bacteria composing the gastric microecosystem. Further studies of the soluble components secreted by Lactobacilli may benefit to the exploration of new drugs against H. pylori-associated diseases in the future.


'/>"/>

Contact: Lai-Fu Li
wjg@wjgnet.com
86-105-908-0039
World Journal of Gastroenterology
Source:Eurekalert

Related medicine news :

1. A potential approach to treatment of hepatitis B virus infection
2. Gulf Coast Dialysis Caregivers, Volunteers Brace for Hurricane Ike; Prepare to Maintain Power, Continued Access for Patients to Life-Saving Treatment
3. Blood Pressure Treatment Can Be Used Against Stroke
4. Young African-American Males Face Mental Health Crisis; Experts Call For New Treatment Strategies and Better Access to Care
5. Hospitals Participating in Get With The Guidelines(SM) Program Follow Heart Attack Treatment Guidelines Better Than Others
6. Drug Re-Sensitizes Breast Tumors to Treatment
7. Age Spots Are No Match for Cosmetic Dermatology Treatments
8. Important Information on Fibromyalgia and Access to Treatments
9. PET scans lead to treatment changes in majority of colorectal cancer patients
10. 13% of Seniors Report Being Mistreated
11. First Major Medical Meeting Convening for MRI-guided Focused Ultrasound to Treat Cancer, Stroke, Fibroids, Other Conditions
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/16/2017)... ... January 16, 2017 , ... ... Dental Center, is currently offering complimentary consultations and financing for orthodontics for a ... for bite irregularities and learn about their orthodontic options. Walk-in, late-evening, Saturday, and ...
(Date:1/16/2017)... ... 2017 , ... Permobil has just completed the acquisition of ... systems has a well-earned reputation for premium quality, with a focus on fit ... in the custom seating business, which enjoys strong demand, and it complements Permobil’s ...
(Date:1/16/2017)... ... 16, 2017 , ... Atlanta-based incentive company Incentive Solutions ... wheelchair accessibility industry, BraunAbility . Incentive Solutions will provide BraunAbility a debit ... With this new incentive plan, BraunAbility plans to continue their tradition of excelling ...
(Date:1/16/2017)... (PRWEB) , ... January 16, 2017 , ... ... editor, attorney, science teacher, http://www.ageofautism.com/legal , Sharon Kleyne, America’s leading water ... Heckenlively to her nationally syndicated radio program, The Sharon Kleyne Hour Power of ...
(Date:1/16/2017)... ... 2017 , ... In 1985, the International Association of Eating ... an international multidisciplinary group of healthcare treatment providers and helping professions who treat ... mission at the grassroots level, iaedp launched MemberSHARE, an online peer community solely ...
Breaking Medicine News(10 mins):
(Date:1/16/2017)...  This report by Persistence Market Research examines ... the period 2016–2024. The primary objective of the ... to market opportunities in the global peripherally inserted ... the various dynamics that are expected to influence ... global peripherally inserted central catheters market over the ...
(Date:1/16/2017)... 16, 2017 Derek H. Potts , ... was recently appointed Liaison Counsel in California,s ... Xarelto cases. In this role, Potts was assigned to ... actively assist the Court and Co Lead Plaintiff,s Counsel. ... Adelman Jackson Fairchild & Wade and Ruth ...
(Date:1/16/2017)... ROCKVILLE, Md. , Jan. 16, 2017 /PRNewswire/ ... tomography (CT) systems market is valued at $4.9 ... applications for CT, coupled with an aging population ... incidence of chronic disease, is propelling the market ... report, Computed Tomography Markets , focuses on ...
Breaking Medicine Technology: