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J. Biol. Chem., Vol. 262, Issue 35, 16755-16758, 12, 1987
ME Vrontakis, LM Peden, ML Duckworth and HG Friesen
Department of Physiology, Faculty of Medicine, University of Manitoba, Winnipeg, Canada.
The administration of high levels of estrogen is a well established method for producing prolactin-secreting pituitary tumors in rodents but the mechanism of tumor induction is not clear. In this paper we describe a cDNA clone (pEIC) which has been isolated from an estrogen- induced pituitary tumor cDNA library. The mRNA transcript corresponding to the pEIC clone is 0.9 kilobase in length and is not detectable in normal pituitaries but is expressed as early as 3 h after estrogen stimulation. Nucleotide sequence analysis of two 700-base pair recombinant clones shows that they encode a 124-amino acid protein which is 70% identical to the porcine galanin precursor. The sequence of 29 amino acid residues coded for by the pEIC cDNA clone is 88% identical with porcine galanin with only three amino acid substitutions near the C terminus. This extensive homology suggests that the pEIC cDNA clone codes for rat galanin or a protein belonging to the galanin gene family. These results provide the first evidence of a physiological regulator (estrogen) of the expression of the galanin gene. They also imply that galanin is secreted by prolactin-secreting tumors. Because intracerebroventricular injection of galanin can stimulate prolactin secretion and galanin inhibits hypothalamic dopamine release, it is conceivable that galanin may play a role in the induction of prolactin-secreting tumors.
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