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Optimized methods for efficient application of immunogold electron microscopy to amyloid fibrils typing
Yan Zhou1, Weining Lu1,2, Eric Burks1
1Department of Pathology and Laboratory Medicine, Boston Medical Center, Boston University Chobanian & Avedisian School of Medicine, Boston, MA, USA.
Summary
This study optimized immunogold electron microscopy (IEM) for efficient amyloid typing in fixed tissues. The improved IEM technique accurately identifies amyloid types, aiding clinical diagnosis and treatment decisions for amyloidosis.
Area of Science:
- Pathology
- Biochemistry
- Microscopy
Background:
- Amyloidosis involves abnormal protein aggregation, causing organ damage.
- Accurate amyloid typing is crucial for diagnosis and treatment.
Purpose of the Study:
- To optimize the immunogold electron microscopy (IEM) technique for efficient amyloid typing.
- To evaluate the optimized IEM technique in various fixed tissue samples.
Main Methods:
- Optimized IEM for 4% paraformaldehyde-fixed (PFA) and formalin-fixed paraffin-embedded (FFPE) tissues.
- Used Lowicryl/K4M embedding and specific stains for amyloid identification.
- Employed antibodies against kappa/lambda light chains, transthyretin, and amyloid A for typing.
Main Results:
- The optimized IEM technique allowed precise localization and rapid identification of amyloid deposits.
- 147 out of 151 specimens (97.4%) were successfully classified by type.
- Lambda light chain was predominant in fat aspirates (56.8%), and transthyretin in heart tissues (71.7%).
Conclusions:
- The optimized IEM technique improves accuracy and efficiency in amyloid typing, particularly for trace deposits.
- This method offers advantages over traditional techniques, supporting timely clinical decisions for amyloidosis patients.
