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Published on: March 12, 2015
Effect of interferon-gamma in experimental Cryptosporidium parvum infection
1Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.
Abstract:
The activity of recombinant murine interferon-gamma (IFN-gamma) against infection by Cryptosporidium parvum was evaluated in immunosuppressed rats. Daily intraperitoneal doses of at least 125,000 U/kg significantly (P < .05) reduced the intensity of subsequent ileal infection. In addition, daily administration of 500,000 U/kg significantly (P < .05) inhibited colonization of the biliary tract. When administered for 11 days to rats with established C. parvum infection, IFN-gamma significantly (P < .05) reduced the number of parasites in the small intestine, but this treatment was ineffective against infection of the biliary tract and large intestine. Although the parasite loads in the common bile duct and large intestine were not significantly reduced, there were fewer cases of infection among the treated rats than in the control group. The data suggest that treatment with IFN-gamma may limit cryptosporidiosis of the small intestine.
Insights
Recombinant murine interferon-gamma (IFN-gamma) effectively reduced Cryptosporidium parvum infection intensity in rat ileum. While less effective in the biliary tract and large intestine, IFN-gamma shows potential for limiting small intestine cryptosporidiosis.
Area of Science:
- Immunology
- Parasitology
- Pharmacology
Background:
- Cryptosporidium parvum is an opportunistic protozoan parasite causing significant gastrointestinal illness.
- Immunosuppression increases susceptibility and severity of cryptosporidiosis.
- Interferon-gamma (IFN-gamma) is a cytokine with known immunomodulatory and anti-parasitic properties.
Purpose of the Study:
- To evaluate the efficacy of recombinant murine interferon-gamma (IFN-gamma) in treating Cryptosporidium parvum infection in an immunosuppressed rat model.
Main Methods:
- Immunosuppressed rats were infected with Cryptosporidium parvum.
- Daily intraperitoneal administration of varying doses of recombinant murine IFN-gamma was employed.
- Parasite loads in the ileum, biliary tract, and large intestine were assessed.
Main Results:
- Significant reduction in ileal parasite intensity was observed with IFN-gamma doses of 125,000 U/kg.
- Inhibition of biliary tract colonization occurred at 500,000 U/kg.
- Treatment of established infections reduced small intestine parasites but was ineffective against biliary and large intestine infections.
Conclusions:
- Recombinant murine IFN-gamma demonstrates significant efficacy in reducing Cryptosporidium parvum infection in the small intestine of immunosuppressed rats.
- IFN-gamma may be a potential therapeutic agent for limiting cryptosporidiosis, particularly in the small intestine.
- Further investigation is warranted for its efficacy against biliary and large intestinal infections.
