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Recovery of nuclei from glycol-methacrylate-embedded tissue.
E T Wright1, J W Jacobberger, T P Pretlow
1Department of Pathology, Case Western Reserve University, Cleveland, OH 44106.
Blood
|October 15, 1990
Summary
Researchers developed a method to recover nuclei from glycol methacrylate (GMA)-embedded tissues for analyzing antigens, enzyme markers, and DNA. This technique preserves cellular components crucial for diagnosing neoplastic diseases like leukemia and lymphoma.
Area of Science:
- Biopathology and Molecular Diagnostics
- Histotechnology and Tissue Processing
Background:
- Traditional paraffin embedding destroys antigens and enzyme markers crucial for classifying neoplastic diseases.
- Accurate DNA content measurement in neoplastic cells historically required fresh cell suspensions.
Purpose of the Study:
- To develop a method for recovering nuclei from glycol methacrylate (GMA)-embedded tissues.
- To enable simultaneous analysis of antigens, enzyme histochemical markers, and DNA from a single tissue sample.
Main Methods:
- Sections of GMA-embedded tonsil were processed using organic solvents or direct rehydration in phosphate-buffered saline (PBS).
- Nuclei were recovered mechanically via gentle sonication.
- DNA content was assessed using fluorescent dyes (chromomycin, Hoechst 33342, propidium iodide) on GMA sections.
Main Results:
- Acetone-fixed, GMA-embedded tissues rehydrated in PBS for six days yielded the highest nuclei recovery (3.7 x 10^7 nuclei/gram).
- Hoechst 33342 demonstrated specific nuclear binding with minimal background staining for DNA analysis.
Conclusions:
- A novel method allows efficient nuclei recovery from GMA-embedded tissues, preserving key analytes.
- This technique facilitates comprehensive analysis of antigens, enzyme markers, and DNA in neoplastic disease diagnostics.