Am J Physiol Cell Physiol AJP: Lung Cellular and Molecular Physiology
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Am J Physiol Cell Physiol 270: C1164-C1174, 1996;
0363-6143/96 $5.00
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AJP - Cell Physiology, Vol 270, Issue 4 C1164-C1174, Copyright © 1996 by American Physiological Society

ARTICLES

EGF receptor mRNA and protein in rat lacrimal acinar cells: evidence of its EGF-dependent phosphotyrosilation

H. Marechal, H. Jammes, B. Rossignol and P. Mauduit
Laboratoire de Biochimie des Transports Cellulaires, Centre National de la Recherche Scientifique, Unite de Recherche Associee 116, Universite Paris-Sud, Orsay, France.

This study was designed to demonstrate the presence of the epidermal growth factor (EGF) receptor in the rat exorbital lacrimal gland. EGF receptor gene transcription was demonstrated 1) by reverse transcription-polymerase chain reaction analysis of lacrimal gland and acinar cells from RNA with a set of specific primers deduced from the rat EGF receptor sequence and 2) by Northern blot analysis of rat lacrimal gland mRNA. Lacrimal acinar cell preparations contain a low but detectable amount of specific 125I-EGF binding sites and efficiently internalize the ligand on binding at 37 degrees C. A sheep polyclonal antibody, directed against the human EGF receptor, detects a protein of 170 kDa by Western blot analysis of membrane proteins of the whole gland. This protein can be immunoprecipitated by the same antibody from whole gland membrane proteins as well as from solubilized acinar cells. Incubations of acinar cells in the presence of EGF results in an increased content of tyrosine-phosphorylated residues in immunoprecipitated 170-kDa protein. Taken together, these results demonstrate for the first time both EGF receptor gene transcription and protein expression in a lacrimal tissue, i.e., the rat exorbital lacrimal gland. These results also suggest a specific cellular location of the EGF receptor in a cell population contained in acinar cell preparations.


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 Am. J. Physiol. Cell Physiol.Home page
H. Marechal, H. Jammes, B. Rossignol, and P. Mauduit
EGF precursor mRNA and membrane-associated EGF precursor protein in rat exorbital lacrimal gland
Am J Physiol Cell Physiol, March 1, 1999; 276(3): C734 - C746.
[Abstract] [Full Text] [PDF]


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