PXD005020

PXD005020 is an original dataset announced via ProteomeXchange.

Title	In vitro infection of AGS cell line with Helicobacter pylori oipA “on” and “off” clinical strains revealed that Outer Inflammatory Protein A (OipA) suppresses apoptosis
Description	Background: Helicobacter pylori is an important human pathogen that infects the human gastric mucosa leading to chronic inflammation which is responsible for severe gastroduodenal diseases. The Outer Inflammatory Protein A (OipA) of H. pylori is an important virulence factor. However, the role of OipA in gastric cancer and ulcer development is still not well-established. Phase variation within a CT dinucleotide repeat motif of oipA switches its expression “on” and “off”. This study aims to elucidate the role of OipA in H. pylori infection using oipA “on” and “off” clinical strains and oipA deletion mutant. Methods: Proteomics analysis was performed on AGS human gastric epithelial cell line post-infection with oipA “on” and “off” H. pylori using liquid chromatography / mass spectrometry (LC/MS). In addition, AGS apoptosis and cell cycle assays were performed. To confirm the findings, oipA deletion mutant (ΔoipA) was generated and expression of VacA was detected using Western blotting. Result: Expression of AGS proteins involve in human disease was suppressed / down-regulated post-infection with oipA “off” strains, as well as oipA mutant, compared to oipA “on” strains. Furthermore, oipA “off” strains and oipA mutant resulted in a higher level of apoptosis and G0/G1 cell-cycle arrest in AGS cells than oipA “on” strains. Interestingly, deletion of oipA was found to increase VacA production by the bacterium. Discussion: The capability of oipA “off” strains to induce apoptosis and suppress proteins having roles in human disease may suggest that these H. pylori may be less virulent or may even be protective against carcinogenesis compared to its oipA “on” counterparts. This may potentially explain the higher incidence of gastric cancer among East Asian which oipA “on” strains predominates. Conclusions: Data from this study strengthened our understanding of the role of H. pylori OipA as a virulence factor in chronic inflammation, metastasis and carcinogenesis.
HostingRepository	PRIDE
AnnounceDate	2024-10-08
AnnouncementXML	Submission_2024-10-08_11:40:05.609.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Anis Al-Maleki
SpeciesList	scientific name: Homo sapiens (Human); NCBI TaxID: 9606;
ModificationList	monohydroxylated residue; iodoacetamide derivatized residue
Instrument	6520A Quadrupole Time-of-Flight LC/MS

Revision	Datetime	Status	ChangeLog Entry
0	2016-09-22 02:17:04	ID requested
⏵ 1	2024-10-08 11:40:06	announced

Dataset with its publication pending

curator keyword: Biological, Biomedical

submitter keyword: H.pylori, LC/Q-TOF MS, proteomic, apoptosis

Jamuna Vadivelu
contact affiliation	Department of Medical Microbiology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia.
contact email	jamuna@um.edu.my
lab head
Anis Al-Maleki
contact affiliation	Department of Medicine, Faculty of Medicine, University of Malaya/ Department of Medical Microbiology, Faculty of Medicine and Health Sciences, Sana’a University.
contact email	almaleki2004@yahoo.com
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD005020
     1. Label: PRIDE project
     2. Name: In vitro infection of AGS cell line with Helicobacter pylori oipA “on” and “off” clinical strains revealed that Outer Inflammatory Protein A (OipA) suppresses apoptosis