NDLI: Insulin and prolactin synergize to induce translation of human serum albumin in the mammary gland of transgenic mice

Content Provider	Springer Nature Link
Author	Baruch, Ariela Shani, Moshe Barash, Itamar
Copyright Year	1998
Abstract	A dramatic uncoupling of the expression of chimaeric β-lactoglobulin (BLG)/human serum albumin (HSA) gene constructs at the RNA and protein levels was observed in cultured mammary explants of virgin transgenic mice. Upon explantation, both HSA RNA and protein were expressed at high levels. However, when the explants were grown in hormone-free medium, HSA RNA continued to accumulate, whereas the synthesis of the corresponding protein was dependent on the presence of insulin and prolactin with a minor contribution of hydrocortisone. The untranslated HSA RNA was indistinguishable from its translatable counterpart in its mobility on agarose gels, was transported normally from the nucleus to the cytoplasm and was translated efficiently in rabbit reticulocyte lysate. In the presence of cycloheximide, HSA RNA rapidly disappeared, suggesting a dependency on ongoing protein synthesis. Its estimated half-life of 5--6 h in hormone-free medium increased significantly in the presence o f insulin, hydrocortisone and prolactin and was comparable to that of β-casein RNA. The uncoupling of the expression of the BLG/HSA transgenes at the RNA and protein levels was also confirmed by in situ hybridization and immunohystochemistry on sections from virgin mammary explants. HSA synthesis was initiated within 13 h of the addition of insulin and prolactin in explants that had accumulated untranslated HSA RNA and was fourfold higher than that observed with insulin alone. Addition of hydrocortisone contributed to an additional 20% in HSA synthesis. We believe this is the first demonstration of translational control of exogenous milk protein gene expression in the mammary gland of transgenic animals
Starting Page	15
Ending Page	27
Page Count	13
File Format	PDF
ISSN	09628819
Journal	Transgenic Research
Volume Number	7
Issue Number	1
e-ISSN	15739368
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1998-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Human Genetics Plant Sciences Animal Anatomy / Morphology / Histology
Content Type	Text
Resource Type	Article
Subject	Genetics Animal Science and Zoology Biotechnology Agronomy and Crop Science

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