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The preparation of thyroid microsomal antigen for use in the indirect micro-ELISA method for the detection of
Abstract:
Thyroid microsomes for use in assay systems for anti-thyroid-microsomal antibodies are normally prepared by ultracentrifugation. By means of gel filtration studies we show that preparations made in this way are invariably contaminated with thyroglobulin. A further purification by gel filtration is described which enables the preparation of thyroid microsomes of sufficient purity for use in a micro-ELISA method for the measurement of anti-thyroid-microsomal antibodies. Microsomes prepared in this way would also be suitable for haemagglutination and radioassays, which are also affected by thyroglobulin contamination.
Insights
Purified thyroid microsomes are essential for accurate anti-thyroid antibody testing. This study introduces a gel filtration method to remove thyroglobulin contamination, improving assays for anti-thyroid-microsomal antibodies.
Area of Science:
- Immunology
- Biochemistry
- Endocrinology
Background:
- Thyroid microsomes are critical components in diagnostic assays for anti-thyroid-microsomal antibodies.
- Conventional ultracentrifugation methods for preparing thyroid microsomes often result in contamination with thyroglobulin.
- Thyroglobulin contamination can interfere with the accuracy of various immunoassays.
Purpose of the Study:
- To investigate the extent of thyroglobulin contamination in thyroid microsomes prepared by ultracentrifugation.
- To develop and describe an improved method for purifying thyroid microsomes.
- To assess the suitability of highly purified thyroid microsomes for specific antibody detection assays.
Main Methods:
- Gel filtration chromatography was employed to analyze and purify thyroid microsomal preparations.
- Studies involved assessing the purity of microsomes using gel filtration techniques.
- A refined gel filtration protocol was developed for enhanced microsomal purification.
Main Results:
- Ultracentrifugation-based preparation of thyroid microsomes consistently showed thyroglobulin contamination.
- Gel filtration effectively separated thyroglobulin from thyroid microsomes, yielding a purer preparation.
- The purified thyroid microsomes were suitable for a micro-enzyme-linked immunosorbent assay (micro-ELISA).
Conclusions:
- Standard ultracentrifugation is insufficient for preparing pure thyroid microsomes due to thyroglobulin contamination.
- Gel filtration offers an effective purification strategy for thyroid microsomes.
- This improved purification method enhances the reliability of assays for anti-thyroid-microsomal antibodies, including micro-ELISA, haemagglutination, and radioassays.