Differential expression of mRNAs for endothelin-related proteins in human endometrium, myometrium and leiomyoma.
The expression of mRNAs encoding endothelin-1 (ET-1) and its receptors (ETA-R and ETB-R) as well as the ET degrading enzyme, neutral endopeptidase 24.11 (NEP), was determined in tissue samples of endometrium, myometrium and leiomyoma by using a reverse transcriptase polymerase chain reaction (RT-PCR) technique. ET-1 mRNA was detected in all samples studied. The level of ET-1 mRNA was higher in endometrium than in myometrium (p < 0.01) and leiomyoma (p < 0.001). The ETA-R mRNA was more abundant in endometrium than in myometrium (p < 0.001). For ETB-R mRNA there was no difference between these tissues. In contrast to ETA-R mRNA, which was more abundant in leiomyoma than in myometrium (p < 0.01), the ETB-R mRNA was less abundant in leiomyoma (p < 0.01). The NEP mRNA was detected in all endometrial samples but not in myometrium and leiomyoma. Our results show that the expression and relative levels of mRNAs encoding ET-1, ETA-R, ETB-R, and NEP vary in different tissue compartments of the human uterus. Since the net biological action of ET-1 in a particular cell type presumably depends on the balance between the peptide itself, its receptors and degrading enzymes, these results suggest different roles for ET-1 action in uterine endometrium, myometrium and leiomyoma. The difference in relative abundance of ETA-R and ETB-R mRNAs between myometrium and leiomyoma suggests that an altered ET-R gene expression may be a contributing factor in myomal growth.
Pekonen
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F
Minerva Foundation Institute for Medical Research, Helsiniki University Central Hospital, Finland.
Nyman
T
T
Rutanen
E M
EM
D001483:Base Sequence; D018076:DNA, Complementary / Q000737:chemistry; D004717:Endometrium / Q000378:metabolism*; D016232:Endothelins / Q000235:genetics*; D005260:Female; D015870:Gene Expression; D006801:Humans; D007889:Leiomyoma / Q000378:metabolism*; D008969:Molecular Sequence Data; D009215:Myometrium / Q000378:metabolism*; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000378:metabolism*; D017466:Receptors, Endothelin / Q000235:genetics*; D014594:Uterine Neoplasms / Q000378:metabolism*
D018076:DNA, Complementary; D016232:Endothelins; D012333:RNA, Messenger; D017466:Receptors, Endothelin