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Effect of specific inhibition of gamma‐glutamyl transpeptidase on amino acid uptake by mammary gland of the lactating rat
Author(s) -
Viña José,
Puertes Inmaculada R.,
Montoro Juan B.,
Viña Juan R.
Publication year - 1983
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(83)80428-1
Subject(s) - mammary gland , in vivo , amino acid , medicine , endocrinology , biochemistry , serine , chemistry , lactation , enzyme , biology , metabolism , pregnancy , genetics , microbiology and biotechnology , cancer , breast cancer
We showed [Biochem. J. (1981) 194, 99–102] that inhibition of γ‐glutamyl transpeptidase in vivo with serine‐borate decreases amino acid uptake by mammary gland. However, doubts arose about the validity of this inhibitor in metabolic studies because it must be used in very large amounts. New Inhibitors have been isolated, like anthglutin and acivicin, which are effective at low concentrations in vivo. Here, we show that treatment of lactating rats with these substances decreases the transpeptidase activity and the amino acid uptake by the gland. These results support the hypothesis that the γ‐glutamyl cycle functions as an amino acid transport system in mammary gland.