Related Experiment Videos
The immunocompromised host: immune alterations in splenectomized patients and clinical implications
E Jirillo1, M L Mastronardi, M Altamura
1Immunology, University of Bari, Italy. jirillo@midim.uniba.it
Current Pharmaceutical Design
|July 23, 2003
Summary
Splenectomized patients face increased infection risks, particularly from Streptococcus pneumoniae. Research indicates impaired phagocytic activity and T helper 1 cell function contribute to these severe postsplenectomy infections (OPSI).
Area of Science:
- Immunology
- Infectious Diseases
- Microbiology
Background:
- The spleen is crucial for host defense against pathogens.
- Splenectomized individuals are susceptible to overwhelming postsplenectomy infections (OPSI), often caused by Streptococcus pneumoniae.
- Current treatments for OPSI, like pneumococcal vaccines, have limitations.
Purpose of the Study:
- To investigate the immunological deficits in splenectomized patients contributing to OPSI.
- To explore the role of T helper 1 cells and cytokines in susceptibility to S. pneumoniae infections.
Main Methods:
- Analysis of phagocytic activity in splenectomized patients.
- Measurement of Interferon-gamma (IFN-γ) and Interleukin-4 (IL-4) levels in patient sera.
- Review of existing literature on T cell responses to S. pneumoniae.
Main Results:
- Splenectomized patients frequently exhibit reduced phagocytic activity.
- Lower levels of Interferon-gamma and Interleukin-4 were observed in sera.
- Deficiencies in Interleukin-12 (IL-12) are linked to severe pneumococcal infections and Th1 cell apoptosis.
Conclusions:
- Impaired phagocytic function and a deficit in T helper 1 cell activity are common in splenectomized patients.
- Reduced levels of key cytokines like IFN-γ and IL-4 suggest a compromised cellular immune response.
- These findings highlight the importance of T cell-mediated immunity in combating S. pneumoniae and suggest potential therapeutic targets for OPSI.