In vitro murine lymphocyte blastogenic responses to Cryptosporidium parvum
1USDA, National Animal Disease Center, Ames, Iowa 50010.
Insights
Mice exposed multiple times orally to Cryptosporidium parvum showed a significant spleen lymphocyte response to the parasite antigen. This indicates a cell-mediated immune response in the spleen against Cryptosporidium parvum.
Area of Science:
- Immunology
- Parasitology
- Cellular Biology
Background:
- Cryptosporidium parvum is a significant enteric pathogen causing opportunistic infections in immunocompromised individuals.
- Understanding the host immune response to C. parvum is crucial for developing effective treatments and vaccines.
- Cell-mediated immunity, particularly involving lymphocytes, plays a key role in controlling parasitic infections.
Purpose of the Study:
- To investigate the in vitro cell-mediated immune response of murine lymphocytes to Cryptosporidium parvum antigen.
- To determine if different routes of C. parvum exposure influence lymphocyte responsiveness.
- To identify specific immune cell populations and locations involved in the anti-Cryptosporidium immune response.
Main Methods:
- Lymphocytes were isolated from the spleen and mesenteric lymph nodes of mice exposed to C. parvum via various routes (oral, intraperitoneal, oral + intraperitoneal, multioral) or unexposed controls.
- Isolated lymphocytes were cultured in vitro with antigen prepared from C. parvum oocysts.
- Antigen-specific blastogenesis, a measure of lymphocyte proliferation and activation, was assessed to evaluate the immune response.
Main Results:
- Spleen lymphocytes from mice exposed via single oral, intraperitoneal, or combined routes did not show a significant response to C. parvum antigen stimulation.
- Spleen lymphocytes from mice with multiple oral exposures to C. parvum exhibited significant antigen-specific blastogenesis (P <= 0.01).
- Mesenteric lymph node lymphocytes did not demonstrate significant in vitro antigen-specific responses, irrespective of the in vivo priming route.
Conclusions:
- Repeated oral exposure to Cryptosporidium parvum can induce a detectable in vitro cell-mediated immune response in murine spleen lymphocytes.
- The spleen appears to be a key site for generating an antigen-specific cellular immune response to C. parvum following appropriate stimulation.
- Mesenteric lymph nodes may play a less prominent role in the detectable in vitro blastogenic response to C. parvum antigen in this model.
Abstract:
Spleen and mesenteric lymph node lymphocytes from both Cryptosporidium parvum-exposed and unexposed mice were cultured with antigen (Ag) prepared from C. parvum oocysts. Spleen lymphocytes from oral-, intraperitoneal-, or oral + intraperitoneal-exposed mice did not respond significantly (P greater than 0.05) to Ag stimulation. Spleen lymphocytes from multioral-exposed mice, however, demonstrated significant (P less than or equal to 0.01) Ag-specific blastogenesis. Mesenteric lymph node lymphocytes did not respond to in vitro Ag stimulation regardless of the route of in vivo priming. These results demonstrate an in vitro cell-mediated immune response against C. parvum by lymphocytes in murine spleen.
