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Transgenic Research : Volume 8, Issue 1, February 1999

Transgenic Research : Volume 7

Transgenic Research : Volume 6

Over‐expression of the murine polymeric immunoglobulin receptor gene in the mammary gland of transgenic mice

Content Provider	Springer Nature Link
Author	Groot, Nanda de Kuik‐Romeijn, Petra van Lee, Sang He de Boer, Herman A.
Copyright Year	1999
Abstract	The polymeric immunoglobulin receptor (pIgR), a transmembrane protein, transports dimeric IgA (dIgA) across the epithelial cells of the mucosal surfaces into the external secretions, for example milk from the mammary glands. The pIgR is consumed during the transcytosis of dIgA and is cleaved at the apical side of the epithelial cells, regardless of the binding to its ligand (dIgA), to form secretory component (SC). We hypothesize that the expression level of the endogenous murine pIgR gene in the epithelial cells is rate‐limiting for the transport of dIgA across the epithelial cells into the secretions. We address this key issue by generating transgenic mice over‐expressing the pIgR gene in their mammary glands in order to examine the effect on dIgA levels in the milk. Here we report on the generation of transgenic mice and analysis of the expression level of pIgR in their mammary glands. We cloned and characterized the murine pIgR gene and constructed an expression cassette bearing the pIgR gene under the control of the regulatory sequences of the bovine α$_{s1}$‐casein gene. Four transgenic lines were made, expressing the pIgR construct at RNA and protein level only in their mammary glands. The levels of the SC protein in the milk ranged from 0.1 to 2.7 mg/ml during mid‐lactation. These levels are 10–270 times higher than wild‐type SC levels (0.01 mg/ml).
Starting Page	125
Ending Page	135
Page Count	11
File Format	PDF
ISSN	09628819
Journal	Transgenic Research
Volume Number	8
Issue Number	2
e-ISSN	15739368
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	1999-01-01
Publisher Place	New York
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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Over‐expression of the murine polymeric immunoglobulin receptor gene in the mammary gland of transgenic mice

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Over‐expression of the murine polymeric immunoglobulin receptor gene in the mammary gland of transgenic mice

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