These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Precocious differentiation of the virgin Wistar-Kyoto rat mammary gland.
    Author: Benton ME, Chen KS, Haag JD, Sattler CA, Gould MN.
    Journal: Endocrinology; 1999 Jun; 140(6):2659-71. PubMed ID: 10342856.
    Abstract:
    The Wistar-Kyoto (WKY) rat strain expresses high levels of beta-casein in its virgin mammary glands. We found that the onset of beta-casein overexpression (BCO) occurs at 6 weeks of age, with morphological differentiation of the mammary gland detectable at 7 weeks of age. BCO was previously shown to be cell autonomous; however, we found that adrenal and ovarian hormones were permissive and necessary for the expression of the BCO phenotype, indicating that the genetic variation that initiates BCO from within the mammary epithelium can only manifest BCO in the presence of virgin hormone levels. Sequencing of the WKY and Wistar-Furth (WF) rat beta-casein promoters showed them to be identical. Culture of primary rat mammary epithelial cells (RMEC) under lactogenic conditions revealed that expression of beta-casein was independent of epidermal growth factor (EGF) in RMEC from virgin WKYv, but was dependent in WFv, RMEC. RMEC from a pregnant WFp responded similarly to WKYv RMEC, suggesting that EGF-independent beta-casein expression occurs naturally in differentiated rat mammary epithelium. However, induction of beta-casein expression in RMEC from immature WKY rats was also independent of EGF, indicating that the induction as well as maintenance of BCO do not require EGF. We suggest that an EGF-independent signaling pathway, arising from a trans-acting inherited effector(s), underlies BCO.
    [Abstract] [Full Text] [Related] [New Search]