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. 1968 Feb;106(3):743–748. doi: 10.1042/bj1060743

Lactogenesis in the rat. Metabolism of uridine diphosphate galactose by mammary gland

N J Kuhn 1,*
PMCID: PMC1198567  PMID: 5639929

Abstract

1. Lactose synthetase activity in the rat mammary gland increases during the last day of pregnancy from an essentially zero value. There is a parallel increase of tissue lactose and of glucose 6-phosphate dehydrogenase activity. 2. Mammary-gland homogenates prepared both before and after parturition hydrolyse the lactose precursors glucose 6-phosphate, glucose 1-phosphate, UDP-glucose, UDP-galactose and also maltose, but not lactose. 3. A role of lactose synthetase as the rate-limiting enzyme for lactose biosynthesis and the possible significance of the hydrolytic activities are discussed with respect to lactogenesis.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. BAAR S., BULL J. P. Salt interference in sugar chromatography of urine. Nature. 1953 Aug 29;172(4374):414–415. doi: 10.1038/172414a0. [DOI] [PubMed] [Google Scholar]
  2. Babad H., Hassid W. Z. Soluble uridine diphosphate D-galactose: D-glucose beta-4-D-galactosyltransferase from bovine milk. J Biol Chem. 1966 Jun 10;241(11):2672–2678. [PubMed] [Google Scholar]
  3. Baldwin R. L., Milligan L. P. Enzymatic changes associated with the initiation and maintenance of lactation in the rat. J Biol Chem. 1966 May 10;241(9):2058–2066. [PubMed] [Google Scholar]
  4. Brodbeck U., Ebner K. E. Resolution of a soluble lactose synthetase into two protein components and solubilization of microsomal lactose synthetase. J Biol Chem. 1966 Feb 10;241(3):762–764. [PubMed] [Google Scholar]
  5. Brodbeck U., Ebner K. E. The subcellular distribution of the A and B proteins of lactose synthetase in bovine and rat mammary tissue. J Biol Chem. 1966 Dec 10;241(23):5526–5532. [PubMed] [Google Scholar]
  6. Ebner K. E., Denton W. L., Brodbeck U. The substitution of alpha-lactalbumin for the B protein of lactose synthetase. Biochem Biophys Res Commun. 1966 Jul 20;24(2):232–236. doi: 10.1016/0006-291x(66)90725-x. [DOI] [PubMed] [Google Scholar]
  7. GLOCK G. E., McLEAN P. Levels of enzymes of the direct oxidative pathway of carbohydrate metabolism in mammalian tissues and tumours. Biochem J. 1954 Jan;56(1):171–175. doi: 10.1042/bj0560171. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. GROSVENOR C. E., TURNER C. W. Lactogenic hormone requirements for milk secretion in intact lactating rats. Proc Soc Exp Biol Med. 1959 Aug-Sep;101:699–703. doi: 10.3181/00379727-101-25066. [DOI] [PubMed] [Google Scholar]
  9. Jermyn M. A., Isherwood F. A. Improved separation of sugars on the paper partition chromatogram. Biochem J. 1949;44(4):402–407. doi: 10.1042/bj0440402. [DOI] [PMC free article] [PubMed] [Google Scholar]
  10. Kuhn N. J., Lowenstein J. M. Lactogenesis in the rat. Changes in metabolic parameters at parturition. Biochem J. 1967 Dec;105(3):995–1002. doi: 10.1042/bj1050995. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. LANGHAM W. H., EVERSOLE W. J., HAYES F. N., TRUJILLO T. T. Assay of tritium activity in body fluids with use of a liquid scintillation system. J Lab Clin Med. 1956 May;47(5):819–825. [PubMed] [Google Scholar]
  12. MALPRESS F. H. Quantiative studies on mammary-gland enzymes involved in lactose synthesis. Biochem J. 1961 Mar;78:527–530. doi: 10.1042/bj0780527. [DOI] [PMC free article] [PubMed] [Google Scholar]
  13. REES E. D. Respiration of epithelial component of mammary gland slices. Am J Physiol. 1960 Dec;199:1067–1069. doi: 10.1152/ajplegacy.1960.199.6.1067. [DOI] [PubMed] [Google Scholar]
  14. SHATTON J. B., GRUENSTEIN M., SHAY H., WEINHOUSE S. ENZYMES OF GALACTOSE SYNTHESIS IN MAMMARY GLAND AND MAMMARY TUMORS OF THE RAT. J Biol Chem. 1965 Jan;240:22–28. [PubMed] [Google Scholar]
  15. Turkington R. W., Juergens W. G., Topper Y. J. Hormone-dependent synthesis of casein in vitro. Biochim Biophys Acta. 1965 Dec 16;111(2):573–576. doi: 10.1016/0304-4165(65)90077-2. [DOI] [PubMed] [Google Scholar]
  16. WATKINS W. M., HASSID W. Z. The synthesis of lactose by particulate enzyme preparations from guinea pig and bovine mammary glands. J Biol Chem. 1962 May;237:1432–1440. [PubMed] [Google Scholar]

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