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Intestinal epithelial cell apoptosis following Cryptosporidium parvum infection
D F McCole1, L Eckmann, F Laurent
1Laboratory of Mucosal Immunology, Department of Medicine, University of California, San Diego, La Jolla, California 92093-0623, USA.
Abstract:
Cryptosporidium parvum induces moderate levels of apoptosis of cultured human intestinal epithelial cells, which are maximal at 24 h after infection. Apoptosis is further increased in C. parvum-infected cells by inhibition of NF-kappaB. C. parvum infection also attenuates epithelial apoptosis induced by strongly proapoptotic agents. The data suggest C. parvum has developed strategies to limit apoptosis in order to facilitate its growth and maturation in the early period after epithelial cell infection.
Insights
Cryptosporidium parvum infection causes moderate apoptosis in human intestinal cells, peaking at 24 hours. The parasite appears to limit this cell death to aid its own growth and maturation.
Area of Science:
- Cell biology
- Infectious diseases
- Immunology
Background:
- Cryptosporidium parvum is an opportunistic protozoan parasite.
- Intestinal epithelial cells form a critical barrier against pathogens.
- Apoptosis, or programmed cell death, plays a role in maintaining tissue homeostasis.
Purpose of the Study:
- To investigate the effect of Cryptosporidium parvum infection on human intestinal epithelial cell apoptosis.
- To explore the role of NF-kappaB signaling in C. parvum-induced apoptosis.
- To understand how C. parvum modulates host cell death pathways.
Main Methods:
- Culturing human intestinal epithelial cells.
- Infection with Cryptosporidium parvum.
- Assessment of apoptosis levels at various time points post-infection.
- Inhibition of NF-kappaB signaling pathway.
Main Results:
- C. parvum infection induced moderate apoptosis in intestinal epithelial cells, with peak levels at 24 hours.
- Inhibition of NF-kappaB signaling further increased apoptosis in infected cells.
- C. parvum infection attenuated apoptosis induced by other proapoptotic stimuli.
Conclusions:
- Cryptosporidium parvum modulates host cell apoptosis.
- The parasite appears to limit epithelial cell apoptosis to facilitate its early growth and maturation.
- Understanding these mechanisms could inform therapeutic strategies against cryptosporidiosis.