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The microheterogeneity of bovine serum alpha 1-acid glycoprotein
Insights
Bovine serum alpha 1-acid glycoprotein (alpha 1AGP) exhibits microheterogeneity. Elevated alpha 1AGP levels and altered Con A binding patterns in cows indicate potential bovine leukemia, unlike asymptomatic virus-infected animals.
Area of Science:
- Veterinary immunology
- Biochemistry
- Proteomics
Background:
- Bovine serum alpha 1-acid glycoprotein (alpha 1AGP) is a key acute-phase protein.
- Understanding its microheterogeneity is crucial for diagnosing bovine diseases.
- Concanavalin A (Con A) is a lectin that binds to specific carbohydrate structures.
Purpose of the Study:
- To investigate the microheterogeneity of bovine serum alpha 1AGP using Con A.
- To differentiate between healthy, leukemia-affected, and subclinically infected cattle based on alpha 1AGP profiles.
Main Methods:
- Crossed affino-immunoelectrophoresis with Concanavalin A (Con A) was employed.
- Serum samples from healthy cows, cows with leukemia, and bovine leukemia virus-infected cows were analyzed.
- Quantification of alpha 1AGP concentration and its fractions was performed.
Main Results:
- Healthy cows showed two main alpha 1AGP fractions (fraction 1 and 2) with specific Con A binding affinities, averaging 0.31 g/l.
- Bovine leukemia cases (5/8) exhibited significantly higher alpha 1AGP concentrations (>0.7 g/l) and the appearance of two additional fractions (fraction 3 and 4).
- Bovine leukemia virus-infected cows without clinical symptoms displayed normal alpha 1AGP concentrations and electrophoretic patterns, similar to healthy cows.
Conclusions:
- Altered microheterogeneity and elevated levels of bovine serum alpha 1AGP are potential biomarkers for bovine leukemia.
- Con A-based electrophoretic analysis can distinguish between healthy, leukemic, and asymptomatic virus-infected cattle.
- Further research may elucidate the specific structural changes in alpha 1AGP associated with bovine leukemia.
Abstract:
The microheterogeneity in bovine serum alpha 1-acid glycoprotein (alpha 1AGP) was examined by crossed affino-immunoelectrophoresis with concanavalin A(Con A). In healthy cows, serum alpha 1AGP revealed 2 fractions which were named fraction 1 and 2 according to the degree of binding affinity to Con A. The mean +/- SD of serum alpha 1AGP concentration was 0.31 +/- 0.09 g/l and the relative amounts of fraction 1 and 2 were approximately 67% and 33% respectively on this method. In bovine leukemia cases, 5 out of 8 had a high serum alpha 1AGP concentration of more than 0.7 g/l. On the electrophoretic pattern, the other 2 fractions (Con A weakly and non-reactive fractions, named fraction 3 and 4) were observed in 5 cases and their relative amounts of 4 fractions were 17.8-28.5%, 35.5-46.0%, 17.9-24.4% and 12.0-17.2%, respectively. In bovie leukemia virus infected cows with no clinical symptoms, however, serum alpha 1AGP concentration and the electrophoretic patterns were almost the same as those in healthy cows.