Gastric Cancer Molecular Signatures Development
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unraveling the Molecular Links Between H. pylori Infection and Gastric Cancer
New research identifies protein signatures that connect Helicobacter pylori infection to the progression of gastric lesions and increased cancer risk, offering potential biomarkers for early detection.
The Progression of Gastric Cancer and the Role of H. pylori
Gastric cancer typically develops through a multi-step process, starting with superficial gastritis and evolving through chronic atrophic gastritis, intestinal metaplasia, and precancerous lesions before ultimately becoming malignant. Helicobacter pylori infection is a major driver of this process, responsible for approximately 90% of non-cardia gastric cancers. While treating H. pylori reduces risk, the precise molecular mechanisms linking infection to cancer development have remained elusive.
Large-Scale Proteomic and Transcriptomic Analysis
Researchers from Peking University Cancer Hospital & Institute, along with collaborators, employed large-scale proteomic profiling and single-cell transcriptomic sequencing to analyze human gastric tissues across various stages of disease. This complete approach integrated prospective follow-up data and population-level plasma proteomics to uncover robust protein signatures associated with H. pylori infection, lesion progression, and cancer risk. the study, published in cancer Biology & Medicine (DOI: 10.20892/j.issn.2095-3941.2025.0077), represents a important step towards understanding the molecular basis of H. pylori-related carcinogenesis.
The investigation involved analyzing gastric tissue samples from a total of 265 individuals – 166 from Linqu, a region in china with a high incidence of gastric cancer, and 99 patients from Beijing. The researchers profiled over 4,200 proteins, ultimately validating 28 as key markers of both H. pylori infection and gastric cancer.
Key protein Markers identified
The study identified specific proteins that are significantly altered in the presence of H. pylori infection and during the progression of gastric cancer. These include proteins that are upregulated (increased in abundance) and downregulated (decreased in abundance).Notable upregulated proteins include OLFM4 and ENO1,while downregulated proteins include GSN and IGFBP2. These changes in protein expression appear to correlate with the severity of gastric lesions and the risk of developing cancer.
| Protein | Change in expression |
|---|---|
| OLFM4 | Upregulated |
| ENO1 | Upregulated |
| GSN | Downregulated |
| IGFBP2 | Downregulated |
Single-Cell Insights into Gastric Cell Changes
Single-cell RNA sequencing, performed on 135,000 gastric cells, provided a detailed view of the changes occurring at the individual cell level. This revealed how H. pylori infection alters the gene expression profiles of different cell types within the gastric tissue, contributing to the development of precancerous lesions and ultimately, cancer.