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Updated: Aug 14, 2026
Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells
Published on: January 29, 2014
[A study of complement fixation test by trinitrophenyl-cap-liposome: application of viral antibody test]
T Yamauchi1, Y Yamamoto, Y Sawayanagi
1Virology Laboratory, SRL, Inc., Hachioji.
Insights
A new diagnostic method uses trinitrophenyl-liposomes (TNP-L) instead of red blood cells in complement fixation (CF) tests for viral infections. This TNP-L approach offers improved reproducibility and precision for viral diagnostics.
Area of Science:
- Immunology
- Virology
- Biochemistry
Context:
- Complement fixation (CF) tests are crucial for diagnosing viral infections.
- Traditional CF tests utilize sensitized erythrocytes, which have limitations.
- Liposomes are increasingly used in immunological research.
Purpose:
- To evaluate the efficacy of trinitrophenyl-liposomes (TNP-L) as a replacement for sensitized erythrocytes in CF tests.
- To assess the performance of TNP-L in viral diagnostics.
Summary:
- Trinitrophenyl-liposomes (TNP-L), sensitized with antibodies, were used in a modified CF test.
- TNP-L dissolve in the presence of animal complements, releasing enclosed carboxyfluorescein.
- The TNP-L based CF test demonstrated good agreement with the traditional erythrocyte-based method.
Impact:
- The TNP-L method eliminates individual differences associated with red blood cells.
- It overcomes the short storage-term limitations of red blood cells.
- This technique offers high reproducibility and intra-day precision for viral diagnostics.
Abstract:
The complement fixation (CF) test is used as one of the diagnostic laboratory procedures for viral infections. The liposome is employed in the immunological method for basic research and we used the trinitrophenyl-cap-liposome (TNP-L) instead of sensitized erythrocyte for CF test. "TNP-L" consists of a plasma membrane of trinitrophenyl bases sensitized with antibody and is dissolved easily by animal complements. Carboxyfluorescein enclosed in liposome is released in fixed quantities according to liposome dissolution. Therefore, as our conclusion, the above CF method has a good agreement to that of sensitized erythrocyte. TNP-L method has advantages to be able to eliminate the individual differences and shorter storage-term of red blood cells and is also satisfactory for utilization with high reproducibility and intra day precision.
