Ebola virus delta peptide is an enterotoxin

Area of Science:

• Virology
• Gastroenterology
• Molecular Biology

Background:

• Severe gastrointestinal symptoms were frequently observed during the 2013-2016 West African Ebola virus (EBOV) outbreak, correlating with poor patient outcomes.
• Delta peptide, a product of EBOV soluble glycoprotein (sGP) processing, is present in infected individuals.

Purpose of the Study:

• To investigate the role of EBOV delta peptide as a potential enterotoxin contributing to gastrointestinal pathology.
• To elucidate the molecular mechanisms underlying delta peptide-induced intestinal damage.

Main Methods:

• Utilized the murine ligated ileal loop model to assess the enterotoxic effects of delta peptide.
• Administered biologically relevant concentrations of delta peptide into ileal loops.
• Performed transcriptomic analyses to identify gene expression changes following delta peptide exposure.

Main Results:

• Injection of delta peptide into murine ileal loops caused significant intestinal fluid accumulation.
• Observed gross alterations in villous architecture and loss of goblet cells.
• Transcriptomic data revealed delta peptide upregulates cell damage and survival pathways while downregulating transporter/exchanger gene expression.

Conclusions:

• Delta peptide functions as a potent enterotoxin, inducing diarrhea through cellular damage and altered gene expression related to fluid secretion.
• These findings suggest that delta peptide may be a key factor in the gastrointestinal pathology associated with EBOV infection.