In vitro regulation of mammary glucose-6-phosphate dehydrogenase activity by palmitoyl coenzyme A, acetate, and polyamines
| Autor: | W. B. Schmotzer, L. V. Swanson, A. J. Young |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
medicine.medical_specialty
Glucose-6-phosphate dehydrogenase activity Spermidine Dehydrogenase Acetates Glucosephosphate Dehydrogenase General Biochemistry Genetics and Molecular Biology chemistry.chemical_compound Mammary Glands Animal Pregnancy Internal medicine Lactation Culture Techniques medicine Putrescine Glucose-6-phosphate dehydrogenase Animals chemistry.chemical_classification Analysis of Variance Palmitoyl Coenzyme A Biogenic Polyamines Fatty Acids Palmitoyl-CoA Endocrinology Enzyme medicine.anatomical_structure chemistry Cattle Female Acyl Coenzyme A |
| Zdroj: | Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine (New York, N.Y.). 193(4) |
| ISSN: | 0037-9727 |
| Popis: | An in vitro study was conducted to determine whether bovine mammary glucose-6-phosphate dehydrogenase (G6PD) activity was regulated by palmitoyl coenzyme A (CoA), acetate, spermidine, and putrescine and whether these effects were dependent upon stage of lactation. Early lactation explants incubated in media containing palmitoyl CoA or acetate had reduced (P less than 0.01) G6PD activity compared with incubated control explants. G6PD activity in early lactation explants was reduced (P less than 0.05) when incubated with 5 microM palmitoyl CoA or 1 mM acetate compared with 25 microM palmitoyl CoA or 10 mM acetate. Spermidine (0.4 mM) reversed (P less than 0.05) palmitoyl CoA-induced inhibition of early lactation G6PD activity at 5 microM, but not at 25 microM palmitoyl CoA. G6PD activity in early lactation explants was decreased (P less than 0.05) when treated with putrescine (0.4 mM) compared with explants treated with spermidine. Addition of acetate in combination with 5 microM palmitoyl CoA reversed G6PD inhibition (P less than 0.05 for 1 mM and P less than 0.01 for 10 mM) while addition of either level of acetate in combination with 25 microM palmitoyl CoA failed to reverse G6PD inhibition. G6PD activity was higher (P less than 0.01) in early lactation than mid-lactation explants. No statistical differences (P greater than 0.1) were found among any treatments in explants from mid-lactation cows. We conclude that palmitoyl CoA and acetate will inhibit G6PD activity in early lactation, but not mid-lactation explants; addition of spermidine will reverse this inhibition. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|