gamma-Glutamyl transpeptidase in lactating mammary secretory tissue of cow and rat

Lactating cow and rat tissues were examined for gamma-glutamyl transpeptidase. The specificity of the enzyme for various amino acid acceptors was determined for mammary tissue. The relative specific activity of gamma-glutamyl transpeptidase was high in cow mammary tissue and lower in rat mammary tis...

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Bibliographic Details
Published inJournal of dairy science Vol. 61; no. 3; pp. 309 - 314
Main Authors Baumrucker, C R, Pocius, P A
Format Journal Article
LanguageEnglish
Published United States American Dairy Science Association 01.03.1978
Subjects
Amino Acids - metabolism
Animals
Cattle - metabolism
Cattle - physiology
Female
gamma-Glutamyltransferase - metabolism
Kidney - enzymology
Lactation
Mammary Glands, Animal - enzymology
Pregnancy
Rats - metabolism
Rats - physiology
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Summary:Lactating cow and rat tissues were examined for gamma-glutamyl transpeptidase. The specificity of the enzyme for various amino acid acceptors was determined for mammary tissue. The relative specific activity of gamma-glutamyl transpeptidase was high in cow mammary tissue and lower in rat mammary tissue in relation to the activity in kidney of the respective mammals. However, activity per gram wet weight of mammary tissues appeared equivalent. gamma-Glutamyl transpeptidase activity towards specific amino acids agreed with the percent extractions of these amino acids by the mammary gland of the lactating cow in vivo. We believe this is the first evidence of a possible system of amino acid transport by mammary tissues.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:0022-0302
1525-3198
DOI:10.3168/jds.S0022-0302(78)83599-1