Related Experiment Video
Updated: Jun 16, 2025
Perturbations of Circulating miRNAs in Irritable Bowel Syndrome Detected Using a Multiplexed High-throughput Gene Expression Platform
Published on: November 30, 2016
Lower Expression of SARS-CoV-2 Host Cell Entry Genes in the Intestinal Mucosa of IBD Patients With Quiescent or
Laura Francesca Pisani1, Gugliemo Albertini Petroni2, Giorgia Crespi3,4
1Unit of Immunology and Functional Genomics, Centro Cardiologico Monzino IRCCS, Milan, Italy.
Background:
Long-term immunosuppressive therapy typically increases the risk of viral infection, yet during the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic, inflammatory bowel disease (IBD) patients showed reduced severe coronavirus disease 2019 (COVID-19) susceptibility. This suggests potential overlapping molecular mechanisms between IBD and COVID-19 that warrant investigation.
Methods:
From April 2020 to April 2022, we enrolled 363 IBD patients and 146 healthy donors. Serum samples were analyzed by enzyme-linked immunoadsorption assay to determine the presence of anti-SARS-CoV-2 antibodies and to measure concentrations of the host-soluble factors sACE2 and mannose-binding lectin (MBL), which have SARS-CoV-2 neutralizing activity. Furthermore, colonic mucosa biopsies were analyzed by real-time PCR to confirm the upregulation of MBL2 as well as to assess the expression of genes encoding SARS-CoV-2 entry molecules (ie, ACE2, TMPRSS2, TMPRSS4, ADAM17, AGTR1).
Results:
Intestinal mucosa expression of ACE2, TMPRSS2, and TMPRSS4 genes was significantly lower in IBD than in healthy individuals, regardless of the type of medication, while ADAM17 and AGT1R were similar across groups. Serum sACE2 levels changed minimally, whereas circulating MBL levels were significantly higher in CD and somewhat elevated in UC patients versus controls. Parallel trends in MBL2 gene expression were observed in IBD patients' intestinal mucosa.
Conclusions:
Overall, our study indicates that the presence of higher basal circulating levels of MBL in CD patients and the decreased intestinal mucosa expression of the SARS-CoV-2 receptor ACE2 and the host cell priming proteases TMPRSS2 and TMPRSS4 in both CD and UC patients may reduce COVID-19 risk, underscoring the potential protective role of these biomarkers in IBD populations against SARS-CoV-2 infection.
Related Concept Videos
01:30Inflammatory Bowel Disease II: Crohn's Disease
Inflammatory bowel disease, commonly known as IBD, refers to a collection of disorders that lead to persistent inflammation of the gastrointestinal tract. The two types of IBD are ulcerative colitis, which impacts the colon, and Crohn's disease, which can involve any part of the gastrointestinal segment.
Crohn's disease
Crohn's disease is a chronic, systemic inflammatory bowel disease (IBD) that predominantly affects the gastrointestinal tract. It is marked by...
01:27Inflammatory Bowel Disease I: Ulcerative Colitis
Inflammatory bowel disease, or IBD, encompasses a group of disorders characterized by chronic inflammation or ulceration of the gastrointestinal tract.
Risk Factors
The exact cause of IBD remains unclear, although it is believed to be due to a mix of genetic, environmental, microbial, and immune factors. Genetic factors are significant in determining susceptibility to IBD, with family history being a critical risk factor. Individuals with a first-degree relative who has IBD are at...
01:23Renewal of Intestinal Stem Cells