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Western blot analysis of cerebrospinal fluid for detection of Aspergillus antigens
P Ray1, A Chakrabarti, M Jatana
1Department of Medical Microbiology and Neurosurgery, Postgraduate Institute of Medical Education and Research, Chandigarh, India.
Abstract:
Western-blot immunoassay of cerebrospinal fluid (CSF) specimens of patients with central nervous system (CNS) aspergillosis (3), CNS candidosis (1) and bacterial meningitis (2) was carried out using pooled serum from histopathologically proven deep-seated aspergillosis cases to detect unique antigenic fractions for aspergillosis in CSF. No reactivity was observed in patients with non-fungal meningitis. Four cross-reactive bands (40, 90, 200 and > 200 KD) were detectable in CSF from patients with both aspergillosis and candidosis of the CNS. Four additional bands (90-200 KD) were consistently present only in patients with aspergillosis. One prominent band (110 KD) was found only in the patient with aspergillosis who had a fatal outcome and raised the possibility of being a poor prognostic marker.
Insights
This study identified unique protein markers in cerebrospinal fluid (CSF) for diagnosing central nervous system (CNS) aspergillosis. These findings aid in differentiating fungal meningitis from bacterial infections.
Area of Science:
- Medical Mycology
- Neuroimmunology
- Diagnostic Microbiology
Background:
- Central nervous system (CNS) aspergillosis is a rare but severe fungal infection.
- Accurate and early diagnosis is crucial for effective treatment and improved patient outcomes.
- Distinguishing fungal meningitis from bacterial meningitis can be challenging.
Purpose of the Study:
- To identify unique antigenic fractions of Aspergillus in cerebrospinal fluid (CSF).
- To develop a diagnostic marker for CNS aspergillosis using Western-blot immunoassay.
- To differentiate CNS aspergillosis from candidosis and bacterial meningitis.
Main Methods:
- Western-blot immunoassay performed on CSF specimens.
- Utilized pooled serum from patients with histopathologically confirmed deep-seated aspergillosis.
- Analyzed CSF from patients with CNS aspergillosis, CNS candidosis, and bacterial meningitis.
Main Results:
- No reactivity observed in non-fungal meningitis cases.
- Four cross-reactive bands (40, 90, 200, >200 KD) detected in both aspergillosis and candidosis CSF.
- Four additional bands (90-200 KD) were specific to CNS aspergillosis.
- A 110 KD band was exclusively found in a fatal aspergillosis case, suggesting potential prognostic value.
Conclusions:
- Western-blot immunoassay can detect unique antigenic fractions in CSF for diagnosing CNS aspergillosis.
- Specific protein bands show promise in differentiating aspergillosis from other CNS infections.
- A 110 KD band may serve as a marker for poor prognosis in CNS aspergillosis.