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Production and characterization of antibodies against microcystins
Abstract:
Antibodies against a microcystin (MCYST) leucine-arginine variant (MCYST-LR) were demonstrated 4 weeks after immunization of rabbits with either MCYST-LR-polylysine- or MCYST-LR-ethylenediamine-modified bovine serum albumin. A radioimmunoassay (RIA), a direct competitive enzyme-linked immunosorbent assay (ELISA), and an indirect competitive ELISA were developed for characterization of the antibodies. Indirect ELISA and RIA revealed that MCYST-LR-ethylenediamine-bovine serum albumin was a better immunogen. Competitive RIA and direct ELISA revealed that the antibodies had good cross-reactivities with an MCYST-arginine-arginine variant (MCYST-RR), MCYST-LR, an MCYST-tyrosine-arginine variant (MCYST-YR), and nodularin (NODLN); but they had lower reactivities with variants MCYST-leucine-tyrosine (MCYST-LY) and MCYST-leucine-alanine (MCYST-LA). The antibodies did not cross-react with ozonolyzed MCYST-LR. The concentrations causing 50% inhibition of binding of reduced MCYST-LR to the antibodies by MCYST-RR, MCYST-LR, MCYST-YR, NODLN, MCYST-LA, and MCYST-LY in the RIA were 43, 105, 112, 503, 671, and 1,920 ng/ml, respectively. The concentrations causing 50% inhibition of binding of MCYST-LR-horseradish peroxidase to the antibodies by MCYST-RR, MCYST-LR, MCYST-YR, NODLN, MCYST-LY, and MCYST-LA in the ELISA were 1.75, 2.2, 3.4, 4.6, 50, and 114 ng/ml, respectively.
Insights
Antibodies against microcystin-LR were developed using modified bovine serum albumin. The resulting antibodies showed broad cross-reactivity with various microcystin variants and nodularin, crucial for toxin detection.
Area of Science:
- Environmental Chemistry
- Immunology
- Analytical Chemistry
Background:
- Microcystins (MCYSTs) are potent cyanotoxins posing risks to aquatic ecosystems and human health.
- Developing sensitive and specific antibodies is crucial for detecting MCYSTs and their variants.
Purpose of the Study:
- To develop and characterize antibodies against microcystin-LR (MCYST-LR).
- To evaluate the immunogenicity of different MCYST-LR conjugates.
- To assess the cross-reactivity profile of the generated antibodies with various MCYST variants and nodularin.
Main Methods:
- Immunization of rabbits with MCYST-LR-polylysine and MCYST-LR-ethylenediamine bovine serum albumin conjugates.
- Development and application of radioimmunoassay (RIA) and direct/indirect competitive enzyme-linked immunosorbent assays (ELISA).
- Quantification of antibody binding and cross-reactivity using inhibition assays.
Main Results:
- MCYST-LR-ethylenediamine conjugate proved to be a more effective immunogen.
- Developed antibodies exhibited significant cross-reactivity with MCYST-RR, MCYST-LR, MCYST-YR, and nodularin (NODLN).
- Lower cross-reactivity was observed with MCYST-LY and MCYST-LA; no cross-reactivity with ozonolyzed MCYST-LR.
Conclusions:
- The generated antibodies are suitable for detecting a range of microcystin variants and nodularin.
- The MCYST-LR-ethylenediamine conjugate is a promising immunogen for antibody development.
- These antibodies can be valuable tools in environmental monitoring and toxicological studies of cyanotoxins.