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  • Title: [Immunochemical study of the heterogeneity of trophoblastic beta 1-glycoprotein].
    Author: Krivonosov SK, Zorin NA, Ionova NK, Reshetova TI, Efremov AD.
    Journal: Biull Eksp Biol Med; 1987 Apr; 103(4):442-4. PubMed ID: 3494478.
    Abstract:
    It has been found that in mild acid (pH 6.6) and mild-alkaline media (pH 7.7) both pregnancy proteins form complete precipitates. In more alkaline buffer solutions the form of alpha 2-glycoprotein (alpha 2-GP) precipitate is preserved, while trophoblastic beta 1-glycoprotein (TBG) shows three immunochemically identical components with different electrophoretic mobility. The form with beta-globulins mobility predominates, and minor fragments are presented by alpha- and gamma-components. All TBG forms are clearly seen at pH 8.6. In more alkaline medium (pH 10.0) the clarity of the precipitates drastically decreases. It is shown that heparin introduction into the gel of first dimension electrophoresis increases anode electrophoretic mobility of both proteins at polysaccharide concentration of at least 0.1 mg/ml. Large amounts of heparin cause the increase in TBG alpha-component precipitate area and the decrease in the form with beta-globulins mobility. At the same time alpha 2-GP precipitate area and form remain unchanged.
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