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Specific components found in circulating immune complexes (CIC) in paracoccidioidomycosis
C S Unterkircher1, S C Yazaki, M T Shimizu
1School of Dentistry, Department of Pathology, São José dos Campos, UNESP, São Paulo, Brazil.
Abstract:
Circulating immune complexes (CIC) from 15 paracoccidioidomycosis (PCM) patient sera and from 20 healthy control sera were analysed. After CIC precipitation, solubilization and acid treatment, only a little reactivity to P. brasiliensis antigens was found in the free antibodies from PCM-CIC. This result has suggested that there were antibodies with a high affinity bound to fungus components. Dissociated CIC were fractionated in a column of Sephacryl S300 and the fractions that probably contained antigens were pooled and applied to an affinity column, prepared with mouse anti-gp43 monoclonal antibody. Using ECL-Western blotting assay two polypeptide with apparent mass of 43 and 62 kDa were found.
Insights
Researchers investigated circulating immune complexes (CIC) in paracoccidioidomycosis (PCM) patients. They identified specific fungal antigens bound within these complexes, aiding in understanding disease-related immune responses.
Area of Science:
- Mycology
- Immunology
- Infectious Diseases
Background:
- Paracoccidioidomycosis (PCM) is a systemic fungal infection caused by Paracoccidioides brasiliensis.
- Circulating immune complexes (CIC) are implicated in the immunopathology of various infectious diseases.
- Understanding the composition of CIC in PCM is crucial for diagnosing and managing the disease.
Purpose of the Study:
- To analyze the components of circulating immune complexes (CIC) in patients with paracoccidioidomycosis (PCM).
- To identify specific fungal antigens bound within these CIC.
- To elucidate the role of high-affinity antibody-antigen interactions in PCM pathogenesis.
Main Methods:
- Circulating immune complexes (CIC) were isolated from serum samples of PCM patients and healthy controls.
- CIC were dissociated, and free antibodies were tested for reactivity against P. brasiliensis antigens.
- Dissociated CIC components were fractionated using Sephacryl S-300 chromatography.
- Fractions containing potential antigens were purified using an affinity column with anti-gp43 monoclonal antibody.
- ECL-Western blotting was employed to detect and characterize polypeptide components.
Main Results:
- Limited reactivity of free antibodies from PCM-CIC suggested high-affinity binding to fungal components.
- Fractionation and affinity purification identified two specific polypeptides within the CIC.
- These polypeptides had apparent molecular masses of 43 kDa and 62 kDa.
- The 43 kDa polypeptide is likely related to the known gp43 antigen of P. brasiliensis.
Conclusions:
- Circulating immune complexes in PCM patients contain fungal antigens, notably polypeptides of 43 kDa and 62 kDa.
- The high-affinity binding of antibodies within CIC suggests a significant role in the host's immune response to P. brasiliensis.
- These findings contribute to understanding the immune mechanisms underlying paracoccidioidomycosis.