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  • Title: Rabbit corticosteroid-binding globulin: primary structure and biosynthesis during pregnancy.
    Author: Seralini GE, Smith CL, Hammond GL.
    Journal: Mol Endocrinol; 1990 Aug; 4(8):1166-72. PubMed ID: 2293023.
    Abstract:
    The cDNA-deduced primary structure of rabbit corticosteroid-binding globulin (CBG) contains 383 amino acids (mol wt, 42,326), including three cysteine residues and four sites for N-glycosylation. It is primarily the product of a 1.68-kilobase hepatic mRNA, but small amounts of CBG mRNA were also found in maternal lung, spleen, and ovary and fetal kidney. In the fetus, hepatic CBG mRNA concentrations increase markedly after day 11 and were 2- to 5-fold higher than those in maternal liver during days 17-23. They then declined to very low levels at term (31 days). By contrast, maternal hepatic CBG mRNA levels did not increase until day 23; reached a peak at about day 27, and then declined to prepregnancy values by 3 days after delivery. In general, fetal and maternal hepatic CBG mRNA concentrations reflect the corresponding serum CBG levels. Our data, therefore, indicate that the marked changes in fetal and maternal plasma CBG levels during pregnancy reflect changes in the biosynthesis of the protein rather than alterations in compartmentalization or clearance.
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