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Whole blood RNA profiling in cats dissects the host immunological response during recovery from feline infectious peritonitis
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Whole blood RNA profiling in cats dissects the host immunological response during recovery from feline infectious peritonitis
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Journal Article
Whole blood RNA profiling in cats dissects the host immunological response during recovery from feline infectious peritonitis
2025
Overview
Feline infectious peritonitis (FIP) is caused by infection with the feline coronavirus (FCoV) and is fatal if left untreated. In most cats, FCoV primarily infects the gastrointestinal tract and remains asymptomatic or causes only mild enteritis, with only a small proportion of infected cats developing FIP. An excessive and harmful immune response leading to characteristic (pyo)granulomatous phlebitis is believed to play a key role in the development of FIP, along with complex interactions between host and viral factors. Our research group recently demonstrated successful treatment of cats with naturally occurring FIP using the antiviral nucleoside analogue GS-441524. Treatment led to complete recovery without any relapses for a follow-up period of one year, demonstrating both a short- and long-term cure. To investigate differential gene expression and corresponding molecular pathways in cats with FIP before, during, and after antiviral treatment, RNA sequencing was performed on full blood samples of 18 cats treated successfully in a prospective study. Samples were analyzed before treatment, at different timepoints while on treatment with GS-441524 and after completion of treatment. Additionally, gene expression profiles were compared to 12 healthy FCoV-infected control cats and 5 healthy uninfected control cats. The results revealed both a widespread dysregulation of the blood RNA signature in cats with FIP as well as its rapid normalization within the first week of treatment. Significant changes were already apparent within the first two days of treatment. The results of the present study suggest that elimination of the virus from the blood leads to rapid control and subsequent normalization of the damaging immune response, a finding that corresponds well to the clinical response to treatment. This study illustrates the host response to treatment at the molecular level and provides further evidence that a shorter treatment duration than the 84 days predominantly practiced is sufficient.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Animals
/ Antigens
/ Antiviral Agents - therapeutic use
/ Blood
/ Cats
/ Coronavirus, Feline - immunology
/ Feces
/ Feline infectious peritonitis
/ Feline Infectious Peritonitis - blood
/ Feline Infectious Peritonitis - drug therapy
/ Feline Infectious Peritonitis - genetics
/ Feline Infectious Peritonitis - immunology
/ Feline Infectious Peritonitis - virology
/ Female
/ Genomes
/ Male
/ Recovery
/ RNA
/ Severe acute respiratory syndrome
/ Viruses
