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Endocrinology Vol. 138, No. 6 2491-2500
Copyright © 1997 by The Endocrine Society

ARTICLES

Decidual/Trophoblast Prolactin-Related Protein: Characterization of Gene Structure and Cell-Specific Expression1

Kyle E. Orwig2, Guoli Dai, Christine A. Rasmussen3 and Michael J. Soares

Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, Kansas 66160

Address all correspondence and requests for reprints to: Dr. Michael Soares, Department of Physiology, University of Kansas Medical Center, Kansas City, Kansas 66160. E-mail: msoares{at}kumc.edu

Decidual/trophoblast PRL-related protein (d/tPRP) is a member of the PRL gene family and is dually expressed in uterine and placental tissues in a highly coordinated pattern during pregnancy. In the present study, we describe the isolation and characterization of the d/tPRP gene. A {lambda} DASH II Wistar-Kyoto rat genomic library was screened with a labeled d/tPRP complementary DNA, resulting in the isolation of two phage clones, RGLd-41 [17.7 kilobases (kb)] and RGLd-42 (15.8 kb). RGLd-41 alone was found to contain the full-length d/tPRP gene and was used for subsequent analyses. The d/tPRP gene possesses a six-exon, five-intron organization. Relative to other highly conserved members of the PRL gene family, d/tPRP contains a single small additional exon (exon 3) situated between exons 2 and 3 of the prototypical PRL gene. The region corresponding to exon 3 of d/tPRP encodes for a unique amino acid region found in a subset of PRL family members. A reverse transcription-PCR (RT-PCR) tissue survey for d/tPRP messenger RNA revealed that d/tPRP expression was restricted to decidual and trophoblast tissues. A single transcription start site 65 bp upstream of the initiation codon was identified in decidual tissue, whereas multiple transcription start sites ranging from 61–66 bp upstream of the initiation codon were detected in placental tissue. Various tissue culture systems (primary cultures and cell lines) were evaluated for d/tPRP expression and activation of a 3.96-kb d/tPRP promoter-luciferase reporter construct. Decidual, spongiotrophoblast, and trophoblast giant cell populations expressed d/tPRP and were capable of activating the d/tPRP promoter-reporter construct, whereas other cell types were ineffective. Limited d/tPRP promoter activation was noted in uterine stromal cell lines. In summary, d/tPRP possesses a unique six-exon, five-intron gene structure and exhibits cell-specific expression that is regulated at least in part by a 3.96-kb 5'-flanking region.




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