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Detection of Pneumocystis carinii in lung-derived samples using monoclonal antibodies to an 82 kDa parasite component
Abstract:
Monoclonal antibodies against Pneumocystis carinii (PC) antigenic epitopes resistant to denaturing procedures were developed by immunization of mice with isolated parasites and a urea extract of infected human lung tissue. Paraffin sections of infected lung tissue were used as antigen in the screening for reactive clones. The target antigen was identified as an 82 kDa parasite specific component in immunoblotting. The antibody showed no cross-reactivity with human lung tissue and various rat tissues and failed to react with a number of parasites and fungi. The antigenic epitope recognized by the anti-82 kDa component was resistant to denaturing procedures involved in fixation and processing of tissues for histology. The antibodies could be used for identification of both cysts and trophozoites in fixed smears of infected lung tissue and bronchoalveolar lavage fluid from infected individuals.
Insights
New monoclonal antibodies target a resilient 82 kDa component of Pneumocystis carinii (PC). These antibodies can identify Pneumocystis pneumonia (PCP) in patient samples, aiding in diagnosis.
Area of Science:
- Immunology
- Parasitology
- Medical Diagnostics
Background:
- Pneumocystis carinii pneumonia (PCP) is a significant opportunistic infection, particularly in immunocompromised individuals.
- Accurate and rapid diagnosis of PCP is crucial for effective treatment and patient management.
- Current diagnostic methods can be limited by the sensitivity and specificity of detecting the Pneumocystis parasite.
Purpose of the Study:
- To develop novel monoclonal antibodies targeting conserved and robust antigenic epitopes of Pneumocystis carinii.
- To characterize the specificity and reactivity of these antibodies against parasite components.
- To evaluate the utility of these antibodies for the identification of Pneumocystis in clinical specimens.
Main Methods:
- Immunization of mice with isolated Pneumocystis carinii and infected human lung tissue extracts.
- Screening of hybridoma clones using paraffin-embedded infected lung tissue sections as antigen.
- Immunoblotting to identify the target antigen and assess antibody specificity, including cross-reactivity tests.
Main Results:
- Development of monoclonal antibodies recognizing a parasite-specific 82 kDa component.
- The targeted antigenic epitope demonstrated resistance to denaturing procedures used in tissue processing.
- Antibodies showed no cross-reactivity with human or rat tissues, or other tested microorganisms.
Conclusions:
- The generated monoclonal antibodies are highly specific for Pneumocystis carinii.
- Their resistance to tissue processing makes them valuable tools for histological identification.
- These antibodies can reliably detect both Pneumocystis cysts and trophozoites in fixed smears and bronchoalveolar lavage fluid, potentially improving PCP diagnostics.