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Endocrinology, Vol 134, 971-981, Copyright © 1994 by Endocrine Society
ARTICLES |
SK Das, H Tsukamura, BC Paria, GK Andrews and SK Dey
Department of Obstetrics-Gynecology, Ralph L. Smith Research Center, University of Kansas Medical Center, Kansas City 66160.
The present study examined several aspects of epidermal growth factor receptor (EGF-R) in the mouse uterus during the peri-implantation period and after ovarian hormone treatment of adult ovariectomized mice. The cell-specific distribution, regulation of expression, and binding kinetics were assessed by immunohistochemistry, Northern blot analysis, and ligand binding assays, respectively. Affinity cross- linking studies ascertained the size of the EGF-R, and its bioactivity was examined by determining EGF-dependent subcellular protein tyrosine kinase activity and receptor autophosphorylation. In the intact uterus and separated cell types, EGF-R was detected in the stroma, deciduum, and myometrium, but not in the luminal or glandular epithelium. Uterine EGF-R mRNA transcript profiles showed some differences between pregnant and ovariectomized mice regardless of steroid hormone treatments. Two major [6.5- and 2.7-kilobase (kb)] and two less abundant (9.6- and 5.0- kb) transcripts were detected in pregnant uterine poly(A)+ RNA. Three additional transcripts (< 2.0 kb) were detected in decidual poly(A)+ RNA, and a larger transcript (8.0 kb) was detected in uterine poly(A)+ RNA isolated from ovariectomized mice. Scatchard analysis of EGF binding also revealed apparent differences in binding kinetics between pregnant and ovariectomized mice, although EGF was cross-linked to a 170-kilodalton protein under these conditions. Two classes (Kd, approximately 0.2 and approximately 2.0 nM) of binding sites were noted in pregnant mice, whereas a single class (Kd, approximately 1.0 nM) was found in ovariectomized mice. 17 beta-Estradiol (E2) caused a rapid transient upregulation of uterine EGF-R mRNA levels and increased the number of EGF-binding sites in ovariectomized mice, as did an injection of progesterone (P4). However, the bioactivity of EGF-R could not be detected in uteri of ovariectomized mice treated with oil or P4. E2 treatment was found to be essential for EGF-R bioactivity. Taken together, the results suggest that in the adult mouse uterus, EGF-R status is influenced by factors other than P4 and E2, the epithelium is not the direct target for the actions of EGF-related growth factors as thought previously, the mitogenic effects of these growth factors on epithelial cells in vivo are perhaps mediated by other uterine cell- types expressing EGF-R, and, lastly, these growth factors are not likely to be functional in the uterus in the absence of estrogen. The present observations are supportive of the concept of paracrine or juxtacrine interactions between EGF-related growth factor ligands of luminal epithelial origin and blastocyst EGF-R in the process of implantation.
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