Abstract:
:Oxytocin receptors (OT-R) are known to be involved in the course of labor since a massive increase in OT-binding sites is observed in the uterus just before parturition. Vasopressin (AVP)-binding sites have also been observed and have been shown to mediate uterotonic responses. To determine exactly which subtypes of OT/AVP receptors are expressed in the rat uterus near parturition, we carried out absolute quantitations of the neurohypophysial hormone receptor (OT-R and the vasopressin receptors V1a-R, V1b-R and V2-R) mRNAs with an assay based on reverse transcription-polymerase chain reaction (RT-PCR) using in vitro transcribed mutated cRNAs as internal standards. The number of mRNA molecules/ng of total RNA was 35 +/- 6, 220 +/- 33 and 39 +/- 9 for OT-R (P < 0.01) and 16 +/- 1, 25 +/- 8 and 31 +/- 5 for V1a-R (P > 0.05) on day (D) 21, 22 and 23 of gestation (post-parturient), respectively. We did not detect V1b-R and V2-R mRNAs in the pregnant uterus. Therefore, the heterogeneity of OT and AVP receptors in the rat uterus can only be assigned to the presence of OT-R and V1a-R neurohypophysial hormone receptor subtypes, whereas V1b-R and V2-R can not be invoked. Only OT-R mRNA levels change in the uterus near parturition.
journal_name
Mol Cell Endocrinoljournal_title
Molecular and cellular endocrinologyauthors
Clerget MS,Elalouf JM,Germain Gdoi
10.1016/s0303-7207(97)00218-9subject
Has Abstractpub_date
1997-12-31 00:00:00pages
79-89issue
1eissn
0303-7207issn
1872-8057pii
S0303720797002189journal_volume
136pub_type
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