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Berkel Kasikci M, Guilois-Dubois S, Billet K, Jardin J, Guyot S, Morzel M. Interactions between Salivary Proteins and Apple Polyphenols and the Fate of Complexes during Gastric Digestion. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024. [PMID: 38603459 DOI: 10.1021/acs.jafc.4c00468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/13/2024]
Abstract
Beneficial polyphenols in apples can reach the stomach as complexes formed with salivary proteins. The present study aimed at documenting the interactions between salivary proteins and cider apple polyphenols and the fate of complexes during gastric digestion. A polyphenolic extract was mixed with human saliva, and interactions were characterized by analyzing proteins and polyphenols in the insoluble and soluble fractions of the mixtures, before and after in vitro gastric digestion. Results confirmed that proline-rich proteins can efficiently precipitate polyphenols and suggested that two zinc-binding proteins can also form insoluble complexes with polyphenols. The classes of polyphenols involved in such complexes depended on the polyphenol-to-protein ratio. In vitro gastric digestion led to extensive proteolysis of salivary proteins, and we formulate the hypothesis that the resulting peptides can interact with and precipitate some procyanidins. Saliva may therefore partly modulate the bioaccessibility of at least procyanidins in the gastric compartment.
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Affiliation(s)
- Müzeyyen Berkel Kasikci
- INRAE, Institut Agro, STLO, 35042 Rennes, France
- Department of Food Engineering, Manisa Celal Bayar University, 45140 Manisa, Turkey
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2
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Gupta N, Kumar A, Verma VK. Strategies adopted by gastric pathogen Helicobacter pylori for a mature biofilm formation: Antimicrobial peptides as a visionary treatment. Microbiol Res 2023; 273:127417. [PMID: 37267815 DOI: 10.1016/j.micres.2023.127417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 05/15/2023] [Accepted: 05/21/2023] [Indexed: 06/04/2023]
Abstract
Enormous efforts in recent past two decades to eradicate the pathogen that has been prevalent in half of the world's population have been problematic. The biofilm formed by Helicobacter pylori provides resistance towards innate immune cells, various combinatorial antibiotics, and human antimicrobial peptides, despite the fact that these all are potent enough to eradicate it in vitro. Biofilm provides the opportunity to secrete various virulence factors that strengthen the interaction between host and pathogen helping in evading the innate immune system and ultimately leading to persistence. To our knowledge, this review is the first of its kind to explain briefly the journey of H. pylori starting with the chemotaxis, the mechanism for selecting the site for colonization, the stress faced by the pathogen, and various adaptations to evade these stress conditions by forming biofilm and the morphological changes acquired by the pathogen in mature biofilm. Furthermore, we have explained the human GI tract antimicrobial peptides and the reason behind the failure of these AMPs, and how encapsulation of Pexiganan-A(MSI-78A) in a chitosan microsphere increases the efficiency of eradication.
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Affiliation(s)
- Nidhi Gupta
- Department of Microbiology, University of Delhi South Campus, Benito Juarez Marg, New Delhi 110021, India.
| | - Atul Kumar
- Department of Microbiology, University of Delhi South Campus, Benito Juarez Marg, New Delhi 110021, India
| | - Vijay Kumar Verma
- Department of Microbiology, University of Delhi South Campus, Benito Juarez Marg, New Delhi 110021, India.
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3
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Wu E, Zhu J, Ma Z, Tuo B, Terai S, Mizuno K, Li T, Liu X. Gastric alarmin release: A warning signal in the development of gastric mucosal diseases. Front Immunol 2022; 13:1008047. [PMID: 36275647 PMCID: PMC9583272 DOI: 10.3389/fimmu.2022.1008047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Accepted: 09/14/2022] [Indexed: 11/13/2022] Open
Abstract
Alarmins exist outside cells and are early warning signals to the immune system; as such, alarmin receptors are widely distributed on various immune cells. Alarmins, proinflammatory molecular patterns associated with tissue damage, are usually released into the extracellular space, where they induce immune responses and participate in the damage and repair processes of mucosal diseases.In the stomach, gastric alarmin release has been shown to be involved in gastric mucosal inflammation, antibacterial defense, adaptive immunity, and wound healing; moreover, this release causes damage and results in the development of gastric mucosal diseases, including various types of gastritis, ulcers, and gastric cancer. Therefore, it is necessary to understand the role of alarmins in gastric mucosal diseases. This review focuses on the contribution of alarmins, including IL33, HMGB1, defensins and cathelicidins, to the gastric mucosal barrier and their role in gastric mucosal diseases. Here, we offer a new perspective on the prevention and treatment of gastric mucosal diseases.
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Affiliation(s)
- Enqin Wu
- Department of Gastroenterology, Digestive Disease Hospital, Affiliated Hospital of Zunyi Medical University, Zunyi, China
| | - Jiaxing Zhu
- Department of Gastroenterology, Digestive Disease Hospital, Affiliated Hospital of Zunyi Medical University, Zunyi, China
| | - Zhiyuan Ma
- Department of Gastroenterology, Digestive Disease Hospital, Affiliated Hospital of Zunyi Medical University, Zunyi, China
| | - Biguang Tuo
- Department of Gastroenterology, Digestive Disease Hospital, Affiliated Hospital of Zunyi Medical University, Zunyi, China
| | - Shuji Terai
- Division of Gastroenterology & Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Kenichi Mizuno
- Division of Gastroenterology & Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Taolang Li
- Department of General Surgery, Affiliated Hospital of Zunyi Medical University, Zunyi, China
- *Correspondence: Xuemei Liu, ; Taolang Li,
| | - Xuemei Liu
- Department of Gastroenterology, Digestive Disease Hospital, Affiliated Hospital of Zunyi Medical University, Zunyi, China
- *Correspondence: Xuemei Liu, ; Taolang Li,
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4
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Pero R, Angrisano T, Brancaccio M, Falanga A, Lombardi L, Natale F, Laneri S, Lombardo B, Galdiero S, Scudiero O. Beta-defensins and analogs in Helicobacter pylori infections: mRNA expression levels, DNA methylation, and antibacterial activity. PLoS One 2019; 14:e0222295. [PMID: 31537016 PMCID: PMC6752957 DOI: 10.1371/journal.pone.0222295] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Accepted: 08/26/2019] [Indexed: 12/19/2022] Open
Abstract
Antimicrobial peptides can protect the gastric mucosa from bacteria, but Helicobacter pylori (H. pylori) can equally colonize the gastric apparatus. To understand beta-defensin function in H. pylori-associated chronic gastritis, we investigated susceptibility, human beta-defensin mRNA expression, and DNA methylation changes to promoters in the gastric mucosa with or without H. pylori infection. We studied the expression of HBD2 (gene name DEFB4A), HBD3 (DEFB103A), and HBD4 (DEFB104) using real-time PCR in 15 control and 10 H. pylori infection patient gastric specimens. This study demonstrates that H. pylori infection is related to gastric enhancement of inducible HBD2, but inducible HBD3 and HBD4 expression levels remained unchanged. HBD2 gene methylation levels were overall higher in H. pylori-negative samples than in H. pylori-positive samples. We also assessed antimicrobial susceptibility using growth on blood agar. The H. pylori strain Tox+ was susceptible to all defensins tested and their analogs (3N, 3NI). These results show that HBD2 is involved in gastritis development driven by H. pylori, which facilitates the creation of an epigenetic field during H. pylori-associated gastric tumorigenesis.
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Affiliation(s)
- Raffaela Pero
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli “Federico II”, Napoli, Italy
- Task Force sugli Studi del Microbioma, Università degli Studi di Napoli “Federico II”, Napoli, Italy
- * E-mail: (RP); (OS)
| | - Tiziana Angrisano
- Dipartimento di Biologia, Università degli Studi di Napoli “Federico II”, Napoli, Italy
| | - Mariarita Brancaccio
- Dipartimento di Biologia ed Evoluzione degli Organismi Marini, Stazione Zoologica Anton Dohrn, Napoli, Italy
| | - Annarita Falanga
- Dipartimento di Farmacia, Università degli Studi di Napoli “Federico II”, Napoli, Italy
| | - Lucia Lombardi
- Dipartimento di Agraria, Università degli Studi di Napoli “Federico II”, Napoli, Italy
| | - Francesco Natale
- Dipartimento di Biologia, Università degli Studi di Napoli “Federico II”, Napoli, Italy
| | - Sonia Laneri
- Dipartimento di Farmacia, Università degli Studi di Napoli “Federico II”, Napoli, Italy
| | - Barbara Lombardo
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli “Federico II”, Napoli, Italy
- CEINGE-Biotecnologie Avanzate Scarl, Napoli, Italy
| | - Stefania Galdiero
- Dipartimento di Farmacia, Università degli Studi di Napoli “Federico II”, Napoli, Italy
| | - Olga Scudiero
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli “Federico II”, Napoli, Italy
- Task Force sugli Studi del Microbioma, Università degli Studi di Napoli “Federico II”, Napoli, Italy
- CEINGE-Biotecnologie Avanzate Scarl, Napoli, Italy
- * E-mail: (RP); (OS)
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5
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Carbohydrate-Dependent and Antimicrobial Peptide Defence Mechanisms Against Helicobacter pylori Infections. Curr Top Microbiol Immunol 2019; 421:179-207. [PMID: 31123890 DOI: 10.1007/978-3-030-15138-6_8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The human stomach is a harsh and fluctuating environment for bacteria with hazards such as gastric acid and flow through of gastric contents into the intestine. H. pylori gains admission to a stable niche with nutrient access from exudates when attached to the epithelial cells under the mucus layer, whereof adherence to glycolipids and other factors provides stable and intimate attachment. To reach this niche, H. pylori must overcome mucosal defence mechanisms including the continuously secreted mucus layer, which provides several layers of defence: (1) mucins in the mucus layer can bind H. pylori and transport it away from the gastric niche with the gastric emptying, (2) mucins can inhibit H. pylori growth, both via glycans that can have antibiotic like function and via an aggregation-dependent mechanism, (3) antimicrobial peptides (AMPs) have antimicrobial activity and are retained in a strategic position in the mucus layer and (4) underneath the mucus layer, the membrane-bound mucins provide a second barrier, and can function as releasable decoys. Many of these functions are dependent on H. pylori interactions with host glycan structures, and both the host glycosylation and concentration of antimicrobial peptides change with infection and inflammation, making these interactions dynamic. Here, we review our current understanding of mucin glycan and antimicrobial peptide-dependent host defence mechanisms against H. pylori infection.
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Mowbray CA, Niranji SS, Cadwell K, Bailey R, Watson KA, Hall J. Gene expression of AvBD6-10 in broiler chickens is independent of AvBD6, 9, and 10 peptide potency. Vet Immunol Immunopathol 2018; 202:31-40. [PMID: 30078596 DOI: 10.1016/j.vetimm.2018.06.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 05/23/2018] [Accepted: 06/07/2018] [Indexed: 02/07/2023]
Abstract
The Avian β-defensin (AvBD) gene cluster contains fourteen genes; within this, two groups (AvBD6/7 and AvBD8 -10) encode charged peptides of >+5 (AvBD6/7), indicative of potent microbial killing activities, and ≤+4 (AvBD8-10), suggestive of reduced antimicrobial activities. Chicken broiler gut tissues are constantly exposed to microbes in the form of commensal bacteria. This study examined whether tissue expression patterns of AvBD6-10 reflected microbial exposure and the encoded peptides a functional antimicrobial hierarchy. Gut AvBD6-10 gene expression was observed in hatch to day 21 birds, although the AvBD8-10 profiles were eclipsed by those detected in the liver and kidney tissues. In vitro challenges of chicken CHCC-OU2 cells using the gut commensal Lactobacillus johnsonii (104 CFU) did not significantly affect AvBD8-10 gene expression patterns, although upregulation (P < 0.05) of IL-Iβ gene expression was observed. Similarly, in response to Bacteriodes doreii, IL-Iβ and IL-6 gene upregulation were detected (P < 0.05), but AvBD10 gene expression remained unaffected. These data suggested that AvBD8-10 gene expression was not induced by commensal gut bacteria. Bacterial time-kill assays employing recombinant (r)AvBD6, 9 and 10 peptides (0.5μM - 12μM), indicated an antimicrobial hierarchy, linked to charge, of AvBD6 > AvBD9 > AvBD10 against Escherichia coli, but AvBD10 > AvBD9 > AvBD6 using Enterococcus faecalis. rAvBD10, selected due to its reduced cationic charge was, using CHCC-OU2 cells, investigated for cell proliferation and wound healing properties, but none were observed. These data suggest that in healthy broiler chicken tissues AvBD6/7 and AvBD8-10 gene expression profiles are independent of the in vitro antimicrobial hierarchies of the encoded AvBD6, 9 and 10 peptides.
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Affiliation(s)
- Catherine A Mowbray
- Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle Upon Tyne, NE2 4HH, UK
| | - Sherko S Niranji
- Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle Upon Tyne, NE2 4HH, UK
| | - Kevin Cadwell
- Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle Upon Tyne, NE2 4HH, UK
| | | | | | - Judith Hall
- Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle Upon Tyne, NE2 4HH, UK.
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7
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Nuding S, Gersemann M, Hosaka Y, Konietzny S, Schaefer C, Beisner J, Schroeder BO, Ostaff MJ, Saigenji K, Ott G, Schaller M, Stange EF, Wehkamp J. Gastric antimicrobial peptides fail to eradicate Helicobacter pylori infection due to selective induction and resistance. PLoS One 2013; 8:e73867. [PMID: 24040100 PMCID: PMC3770654 DOI: 10.1371/journal.pone.0073867] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2012] [Accepted: 07/31/2013] [Indexed: 12/16/2022] Open
Abstract
Background Although antimicrobial peptides protect mucus and mucosa from bacteria, Helicobacter pylori is able to colonize the gastric mucus. To clarify in which extend Helicobacter escapes the antimicrobial defense, we systematically assessed susceptibility and expression levels of different antimicrobial host factors in gastric mucosa with and without H. pylori infection. Materials and Methods We investigated the expression levels of HBD1 (gene name DEFB1), HBD2 (DEFB4A), HBD3 (DEFB103A), HBD4 (DEFB104A), LL37 (CAMP) and elafin (PI3) by real time PCR in gastric biopsy samples in a total of 20 controls versus 12 patients colonized with H. pylori. Immunostaining was performed for HBD2 and HBD3. We assessed antimicrobial susceptibility by flow cytometry, growth on blood agar, radial diffusion assay and electron microscopy. Results H. pylori infection was associated with increased gastric levels of the inducible defensin HBD2 and of the antiprotease elafin, whereas the expression levels of the constitutive defensin HBD1, inducible HBD3 and LL37 remained unchanged. HBD4 was not expressed in significant levels in gastric mucosa. H. pylori strains were resistant to the defensins HBD1 as well as to elafin, and strain specific minimally susceptible to HBD2, whereas HBD3 and LL37 killed all H. pylori strains effectively. We demonstrated the binding of HBD2 and LL37 on the surface of H. pylori cells. Comparing the antibacterial activity of extracts from H. pylori negative and positive biopsies, we found only a minimal killing against H. pylori that was not increased by the induction of HBD2 in H. pylori positive samples. Conclusion These data support the hypothesis that gastric H. pylori evades the host defense shield to allow colonization.
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Affiliation(s)
- Sabine Nuding
- Dr. Margarete Fischer-Bosch-Institute of Clinical Pharmacology and University of Tübingen, Stuttgart, Germany
- * E-mail:
| | - Michael Gersemann
- Department of Internal Medicine I, Robert-Bosch Hospital, Stuttgart, Germany
| | - Yoshio Hosaka
- Department of Internal Medicine, Isuzu Hospital, Tokyo, Japan
| | - Sabrina Konietzny
- Department of Internal Medicine I, Robert-Bosch Hospital, Stuttgart, Germany
| | - Christian Schaefer
- Department of Internal Medicine I, Robert-Bosch Hospital, Stuttgart, Germany
| | - Julia Beisner
- Dr. Margarete Fischer-Bosch-Institute of Clinical Pharmacology and University of Tübingen, Stuttgart, Germany
| | - Bjoern O. Schroeder
- Dr. Margarete Fischer-Bosch-Institute of Clinical Pharmacology and University of Tübingen, Stuttgart, Germany
| | - Maureen J. Ostaff
- Dr. Margarete Fischer-Bosch-Institute of Clinical Pharmacology and University of Tübingen, Stuttgart, Germany
| | - Katunori Saigenji
- Department of Gastroenterology, Kitasato University, Kanagawa, Japan
| | - German Ott
- Department of Clinical Pathology, Robert-Bosch Hospital, Stuttgart, Germany
| | - Martin Schaller
- Department of Dermatology, Eberhard Karls University, Tübingen, Tübingen, Germany
| | - Eduard F. Stange
- Department of Internal Medicine I, Robert-Bosch Hospital, Stuttgart, Germany
| | - Jan Wehkamp
- Dr. Margarete Fischer-Bosch-Institute of Clinical Pharmacology and University of Tübingen, Stuttgart, Germany
- Department of Internal Medicine I, Robert-Bosch Hospital, Stuttgart, Germany
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8
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Cholesterol enhances Helicobacter pylori resistance to antibiotics and LL-37. Antimicrob Agents Chemother 2011; 55:2897-904. [PMID: 21464244 DOI: 10.1128/aac.00016-11] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The human gastric pathogen Helicobacter pylori steals host cholesterol, modifies it by glycosylation, and incorporates the glycosylated cholesterol onto its surface via a cholesterol glucosyltransferase, encoded by cgt. The impact of cholesterol on H. pylori antimicrobial resistance is unknown. H. pylori strain 26695 was cultured in Ham's F12 chemically defined medium in the presence or absence of cholesterol. The two cultures were subjected to overnight incubations with serial 2-fold dilutions of 12 antibiotics, six antifungals, and seven antimicrobial peptides (including LL-37 cathelicidin and human alpha and beta defensins). Of 25 agents tested, cholesterol-grown H. pylori cells were substantially more resistant (over 100-fold) to nine agents than were H. pylori cells grown without cholesterol. These nine agents included eight antibiotics and LL-37. H. pylori was susceptible to the antifungal drug pimaricin regardless of cholesterol presence in the culture medium. A cgt mutant retained cholesterol-dependent resistance to most antimicrobials but displayed increased susceptibility to colistin, suggesting an involvement of lipid A. Mutation of lpxE, encoding lipid A1-phosphatase, led to loss of cholesterol-dependent resistance to polymyxin B and colistin but not other antimicrobials tested. The cgt mutant was severely attenuated in gerbils, indicating that glycosylation is essential in vivo. These findings suggest that cholesterol plays a vital role in virulence and contributes to the intrinsic antibiotic resistance of H. pylori.
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9
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Watabe H, Mitsushima T, Derakhshan MH, Yamaji Y, Okamoto M, Kawabe T, Omata M, McColl KEL. Study of association between atrophic gastritis and body mass index: a cross-sectional study in 10,197 Japanese subjects. Dig Dis Sci 2009; 54:988-95. [PMID: 18787953 DOI: 10.1007/s10620-008-0468-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2008] [Accepted: 07/16/2008] [Indexed: 12/25/2022]
Abstract
OBJECTIVES The aim of this study was to elucidate the association between body mass index (BMI) and both Helicobacter pylori and atrophic gastritis. METHODS The study involved 10,197 subjects participating in a Japanese mass endoscopic gastric cancer screening program. Atrophic gastritis was assessed by pepsinogen I to II ratio. RESULTS In logistic regression models, BMI had an inverse association with atrophic gastritis, with the odds ratios (OR) decreasing progressively to 0.67 (95% confidence interval [CI] 0.57-0.79, P<0.0001) in the highest BMI quintiles (BMI >or=25.66) group compared with the lowest BMI quintiles (BMI <20.97) group. In linear regression models, atrophic gastritis predicted BMI (regression coefficient -0.326, 95% CI -0.469, -0.184, P<0.0001), whereas H. pylori antibody was not a predictor (regression coefficient 0.072, 95% CI -0.053, 0.198, P=0.3). CONCLUSIONS A small, inverse association between BMI and atrophic gastritis was found in the general population. In contrast, no association was observed between H. pylori seropositivity and BMI.
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Affiliation(s)
- Hirotsugu Watabe
- Medical Sciences, Gardiner Institute, Western Infirmary, University of Glasgow, Glasgow G11 6NT, UK
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10
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Abstract
PURPOSE OF REVIEW The purpose of this review is to summarize recent studies that investigated the role of ghrelin and ghrelin analogs in wasting conditions. RECENT FINDINGS Numerous studies have demonstrated potential beneficial effects exerted by ghrelin in a number of diseases associated with wasting. Besides ghrelin's orexigenic effect, anabolic as well as anti-inflammatory activity mediated by ghrelin have been investigated in wasting conditions such as cancer, diabetes mellitus, malabsorptive diseases, chronic obstructive pulmonary disease, anorexia nervosa, renal failure, liver failure, and chronic heart failure. Encouraging results have been obtained from experimental studies and a few clinical trials using subcutaneous administration of ghrelin and ghrelin agonists in cachexia. In-vitro studies have shown ghrelin and des-acyl ghrelin biological activities on proliferation of tumor cells and abnormal tissues. SUMMARY The recent studies support the possible positive effects of ghrelin in therapeutic approaches and adjunct treatment of a number of diseases associated with wasting. Utilization of agonists of the ghrelin receptor growth hormone secretagogue-1a is a promising approach for clinical use. Randomized and placebo-controlled studies, including large number of patients are further required.
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Affiliation(s)
- Mayra M Kamiji
- Department of Gastroenterology, Faculty of Medicine, University of São Paulo, Ribeirão Preto, Brazil
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11
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Wehrens A, Aebischer T, Meyer TF, Walduck AK. Leptin receptor signaling is required for vaccine-induced protection against Helicobacter pylori. Helicobacter 2008; 13:94-102. [PMID: 18321299 DOI: 10.1111/j.1523-5378.2008.00591.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
BACKGROUND A vaccine against Helicobacter pylori would be a desirable alternative to antibiotic therapy. Vaccination has been shown to be effective in animal models but the mechanism of protection is poorly understood. Previous studies investigating the gene expression in stomachs of vaccinated mice showed changes in adipokine expression correlated to a protective response. In this study, we investigate a well-characterized adipokine-leptin, and reveal an important role for leptin receptor signaling in vaccine-induced protection. MATERIALS AND METHODS Leptin receptor signaling-deficient (C57BL/Ks Lepr(db)), wild-type C57BL/Ks m littermates and C57BL/6 mice were vaccinated, and then challenged with H. pylori. Levels of bacterial colonization, antibody levels, and gastric infiltrates were compared. The local gene expression pattern in the stomach of leptin receptor signaling-deficient and wild-type mice was also compared using microarrays. RESULTS Interestingly, while vaccinated wild-type lean C57BL/6 and C57BL/Ks m mice were able to significantly reduce colonization compared to controls, vaccinated obese C57BL/Ks Lepr(db) were not. All mice responded to vaccination, i.e. developed infiltrates predominantly of T lymphocytes in the gastric mucosa, and made H. pylori-specific antibodies. A comparison of expression profiles in protected C57BL/6 and nonprotected C57BL/Ks Lepr(db) mice revealed a subset of inflammation-related genes that were more strongly expressed in nonprotected mice. CONCLUSIONS Our data suggest that functional leptin receptor signaling is required for mediating an effective protective response against H. pylori.
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Affiliation(s)
- Andrea Wehrens
- Department of Molecular Biology, Max-Planck Institute for Infection Biology, Charitéplatz 1, 10117 Berlin, Germany
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12
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Alpha-defensin expression in the gastric tissue of children with Helicobacter pylori-associated chronic gastritis: an immunohistochemical study. J Pediatr Gastroenterol Nutr 2008; 46:474-7. [PMID: 18367969 DOI: 10.1097/mpg.0b013e31815a9923] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
In this study, we evaluated the expression of alpha-defensin and its correlation with histological criteria in children with and without Helicobacter pylori-associated gastritis. Forty-five children were included. Immunohistochemical staining was performed and the relationship between alpha-defensin immunoscoring and H. pylori status and histological criteria was evaluated. Expression of alpha-defensin was significantly higher in the H. pylori-positive group (P < 0.001) and it was significantly associated with higher grades of chronic inflammation and neutrophil density (P < 0.001 for both). Our data show that alpha-defensin expression is increased in H. pylori infection in childhood and is associated with inflammatory tissue damage.
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13
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Tan S, Liang CRMY, Yeoh KG, So J, Hew CL, Chung MCM. Gastrointestinal fluids proteomics. Proteomics Clin Appl 2007; 1:820-33. [PMID: 21136736 DOI: 10.1002/prca.200700169] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2007] [Indexed: 01/19/2023]
Abstract
Seventy million people suffer from diseases of the gastrointestinal tract annually in US, translating to US$85.5 billion in direct healthcare costs. The debilitating effects of these gastrointestinal (GI) diseases can be circumvented with good biomarkers for early detection of these disorders, which will greatly increase the success of curative treatments. GI fluids represent a potential reservoir of biomarkers for early diagnosis of various GI and systemic diseases since these fluids are the most proximal fluid bathing diseased cells. They are anticipated to have proteomes that closely reflect the ensemble of proteins secreted from the respective GI tissues. Most importantly, the disease markers present in GI fluids should be present in higher concentrations than in sera, thus offering greater sensitivity in their detection. However, proteome analysis of GI fluids can be complex mainly due to the dynamic range of protein content and the numerous PTMs of proteins in each specialized GI compartment. This review attempts to discuss the physiology of the various GI fluids, the special technical considerations required for proteome analysis of each fluid, as well as to summarize the current state of knowledge of biomarker discoveries and clinical utility of GI fluids such as salivary, gastric, pancreatic, and biliary secretions.
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Affiliation(s)
- Sandra Tan
- Department of Biochemistry, Yong Loo Lin School of Medicine, Singapore, Singapore
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14
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Park SH, Jung MH, Chung NG, Suh BK, Lee BC. Serum ghrelin and leptin concentrations in children with cancer : comparisons with normal children. KOREAN JOURNAL OF PEDIATRICS 2007. [DOI: 10.3345/kjp.2007.50.9.905] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- So Hyun Park
- Department of Pediatrics, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Min Ho Jung
- Department of Pediatrics, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Nac Gyun Chung
- Department of Pediatrics, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Byung-Kyu Suh
- Department of Pediatrics, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Byung Churl Lee
- Department of Pediatrics, College of Medicine, The Catholic University of Korea, Seoul, Korea
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Ji F, Wang ZW, Ning JW, Wang QY, Chen JY, Li YM. Effect of drug treatment on hyperplastic gastric polyps infected with Helicobacter pylori: A randomized, controlled trial. World J Gastroenterol 2006; 12:1770-3. [PMID: 16586550 PMCID: PMC4124356 DOI: 10.3748/wjg.v12.i11.1770] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
AIM: To study the effects of drug treatment on hyperplastic gastric polyps infected with Helicobacter pylori (H pylori).
METHODS: Forty-eight patients with hyperplastic gastric polyps (3-10 mm in diameter) infected with H pylori were randomly assigned to a treatment group (n = 24) which received proton-pump inhibitor (omeprazole or lansoprazole), clarithromycin, bismuth citrate and tinidazole, and a control group (n = 24) which received protective agent of gastric mucosa(tepretone). Patients underwent endoscopy and H pylori examination regularly before enrollment and 1-12 mo after treatment.
RESULTS: Twenty-two patients in the treatment group and 21 in the control group completed the entire test protocol. In the treatment group, polyps disappeared 1-12 mo (average, 6.5 ± 1.1 mo) after the treatment in 15 of 22 patients (68.2%) and H pylori infection was eradicated in 19 of the 22 patients (86.4%). However, 12 months after the study, no change in polyps or H pylori status was seen in any controls (bP < 0.01).
CONCLUSION: Most hyperplastic gastric polyps disappear after eradication of H pylori.
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Affiliation(s)
- Feng Ji
- First Affiliated Hospital, Medicine School of Zhejiang University, Hangzhou 310003, Zhejiang Provice, China.
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