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Optimized preservation of CNS morphology for the identification of glycogen in the Pompe mouse model
Tatyana V Taksir1, Denise Griffiths, Jennifer Johnson
1Department of Pathology, Genzyme Corporation, One Mountain Road, Framingham, MA 01701-9322, USA. tatyana.taksir@genzyme.com
Abstract:
Pompe disease (glycogenosis type II) is a rare lysosomal disorder caused by a mutational deficiency of acid alpha-glucosidase (GAA). This deficiency leads to glycogen accumulation in multiple tissues: heart, skeletal muscles, and the central nervous system. A knockout mouse model mimicking the human condition has been used for histological evaluation. Currently, the best method for preserving glycogen in Pompe samples uses epon-araldite resin. Although the preservation by this method is excellent, the size of the tissue is limited to 1 mm(3). To accurately evaluate brain pathology in the Pompe mouse model, a modified glycol methacrylate (JB-4 Plus) method was developed. This approach allowed the production of larger tissue sections encompassing an entire mouse hemisphere (8 x 15 mm) while also providing a high level of morphological detail and preservation of glycogen. Application of the JB-4 Plus method is appropriate when a high level of cellular detail is desired. A modified paraffin method was also developed for use when rapid processing of multiple samples is a priority. Traditional paraffin processing results in glycogen loss. The modified paraffin method with periodic acid postfixation resulted in improved tissue morphology and glycogen preservation. Both techniques provide accurate anatomic evaluation of the glycogen distribution in Pompe mouse brain.
Insights
New histological methods improve glycogen preservation in Pompe disease mouse models. Modified glycol methacrylate and paraffin techniques allow for larger tissue sections and detailed evaluation of brain pathology.
Area of Science:
- Biochemistry
- Neuropathology
- Histology
Background:
- Pompe disease (glycogenosis type II) is a rare lysosomal storage disorder resulting from acid alpha-glucosidase (GAA) deficiency.
- GAA deficiency causes glycogen accumulation in vital organs, including the brain, impacting cellular function.
- Current histological methods, like epon-araldite resin, limit tissue sample size, hindering comprehensive analysis.
Purpose of the Study:
- To develop improved histological techniques for evaluating glycogen accumulation in the Pompe disease mouse model.
- To enable the examination of larger brain tissue sections for a more accurate assessment of pathology.
- To optimize methods for preserving glycogen and cellular morphology in Pompe mouse brain samples.
Main Methods:
- Development of a modified glycol methacrylate (JB-4 Plus) embedding method for larger tissue sections (8 x 15 mm).
- Adaptation of a modified paraffin embedding technique with periodic acid postfixation for rapid processing and improved glycogen preservation.
- Histological evaluation of Pompe mouse brain tissue using both modified methods.
Main Results:
- The modified JB-4 Plus method successfully preserved glycogen and provided high morphological detail in large tissue sections (entire hemisphere).
- The modified paraffin method demonstrated improved glycogen preservation and tissue morphology compared to traditional paraffin processing.
- Both techniques facilitated accurate anatomical evaluation of glycogen distribution in the Pompe mouse brain.
Conclusions:
- Modified JB-4 Plus and paraffin methods offer superior alternatives for histological evaluation of Pompe disease mouse models.
- These techniques overcome the limitations of traditional methods, allowing for detailed analysis of brain pathology and glycogen distribution.
- Optimized histological approaches are crucial for advancing research into Pompe disease and developing effective therapeutic strategies.
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