AUTORADIOGRAPHICAL LOCALIZATION OF OXYTOCIN BINDING-SITES ON OVINE OVIDUCT AND UTERUS THROUGHOUT THE ESTROUS-CYCLE

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Abstract

A highly specific oxytocin receptor ligand, I-125-labelled d(CH2)5[Tyr(Me)2, Thr4, Tyr-NH2(9)] vasotocin (I-125-OTA), was used to localize high affinity oxytocin receptors in ovine uterine and oviduct tissues throughout the oestrous cycle. The pattern of binding revealed by in vitro autoradiography correlated well with the results of the homogenate receptor assays using the same ligand and with previous binding assays using the tritiated ligand.

At oestrus, specific I-125-OTA binding was evident on the luminal epithelium of the caruncular and intercaruncular regions, on the epithelial cells lining the secretory uterine glands and in the stroma underlying the caruncular epithelium. In the myometrium diffuse labelling was evident in the outer longitudinal smooth muscle layer. At Day 4 of the cycle, binding to the stroma was diffuse and virtually absent from the glandular epithelium. No specific binding was evident in either tissue at Day 12 of the luteal phase, but by Day 14, prior to the decrease in peripheral progesterone concentrations, binding was again apparent on the luminal eptihelium only. Specific binding to the oviduct was localized to the smooth muscle layer of the isthmus region of oestrous ewes and was not detected at any other stage of the oestrous cycle.

These studies extend our knowledge of the distribution of oxytocin binding sites in uterine and oviduct tissues throughout the oestrous cycle and suggest that oxytocin has an important role in stimulating oviduct and uterine motility at a time crucial to successful egg collection and/or sperm embryo transport.

Original languageEnglish
Pages (from-to)127-135
Number of pages9
JournalReproduction, Fertility and Development
Volume3
Issue number2
Publication statusPublished - 1991

Keywords

  • OXYTOCIN RECEPTORS
  • MYOMETRIUM
  • ENDOMETRIUM
  • SHEEP
  • RECEPTOR-BINDING
  • EWE
  • PREGNANCY
  • RELEASE

Cite this

@article{17b24f448d5a4f529923c881556ec413,
title = "AUTORADIOGRAPHICAL LOCALIZATION OF OXYTOCIN BINDING-SITES ON OVINE OVIDUCT AND UTERUS THROUGHOUT THE ESTROUS-CYCLE",
abstract = "A highly specific oxytocin receptor ligand, I-125-labelled d(CH2)5[Tyr(Me)2, Thr4, Tyr-NH2(9)] vasotocin (I-125-OTA), was used to localize high affinity oxytocin receptors in ovine uterine and oviduct tissues throughout the oestrous cycle. The pattern of binding revealed by in vitro autoradiography correlated well with the results of the homogenate receptor assays using the same ligand and with previous binding assays using the tritiated ligand.At oestrus, specific I-125-OTA binding was evident on the luminal epithelium of the caruncular and intercaruncular regions, on the epithelial cells lining the secretory uterine glands and in the stroma underlying the caruncular epithelium. In the myometrium diffuse labelling was evident in the outer longitudinal smooth muscle layer. At Day 4 of the cycle, binding to the stroma was diffuse and virtually absent from the glandular epithelium. No specific binding was evident in either tissue at Day 12 of the luteal phase, but by Day 14, prior to the decrease in peripheral progesterone concentrations, binding was again apparent on the luminal eptihelium only. Specific binding to the oviduct was localized to the smooth muscle layer of the isthmus region of oestrous ewes and was not detected at any other stage of the oestrous cycle.These studies extend our knowledge of the distribution of oxytocin binding sites in uterine and oviduct tissues throughout the oestrous cycle and suggest that oxytocin has an important role in stimulating oviduct and uterine motility at a time crucial to successful egg collection and/or sperm embryo transport.",
keywords = "OXYTOCIN RECEPTORS, MYOMETRIUM, ENDOMETRIUM, SHEEP, RECEPTOR-BINDING, EWE, PREGNANCY, RELEASE",
author = "Jacqueline Wallace and R HELLIWELL and Morgan, {Peter John}",
year = "1991",
language = "English",
volume = "3",
pages = "127--135",
journal = "Reproduction, Fertility and Development",
issn = "1031-3613",
publisher = "CSIRO",
number = "2",

}

TY - JOUR

T1 - AUTORADIOGRAPHICAL LOCALIZATION OF OXYTOCIN BINDING-SITES ON OVINE OVIDUCT AND UTERUS THROUGHOUT THE ESTROUS-CYCLE

AU - Wallace, Jacqueline

AU - HELLIWELL, R

AU - Morgan, Peter John

PY - 1991

Y1 - 1991

N2 - A highly specific oxytocin receptor ligand, I-125-labelled d(CH2)5[Tyr(Me)2, Thr4, Tyr-NH2(9)] vasotocin (I-125-OTA), was used to localize high affinity oxytocin receptors in ovine uterine and oviduct tissues throughout the oestrous cycle. The pattern of binding revealed by in vitro autoradiography correlated well with the results of the homogenate receptor assays using the same ligand and with previous binding assays using the tritiated ligand.At oestrus, specific I-125-OTA binding was evident on the luminal epithelium of the caruncular and intercaruncular regions, on the epithelial cells lining the secretory uterine glands and in the stroma underlying the caruncular epithelium. In the myometrium diffuse labelling was evident in the outer longitudinal smooth muscle layer. At Day 4 of the cycle, binding to the stroma was diffuse and virtually absent from the glandular epithelium. No specific binding was evident in either tissue at Day 12 of the luteal phase, but by Day 14, prior to the decrease in peripheral progesterone concentrations, binding was again apparent on the luminal eptihelium only. Specific binding to the oviduct was localized to the smooth muscle layer of the isthmus region of oestrous ewes and was not detected at any other stage of the oestrous cycle.These studies extend our knowledge of the distribution of oxytocin binding sites in uterine and oviduct tissues throughout the oestrous cycle and suggest that oxytocin has an important role in stimulating oviduct and uterine motility at a time crucial to successful egg collection and/or sperm embryo transport.

AB - A highly specific oxytocin receptor ligand, I-125-labelled d(CH2)5[Tyr(Me)2, Thr4, Tyr-NH2(9)] vasotocin (I-125-OTA), was used to localize high affinity oxytocin receptors in ovine uterine and oviduct tissues throughout the oestrous cycle. The pattern of binding revealed by in vitro autoradiography correlated well with the results of the homogenate receptor assays using the same ligand and with previous binding assays using the tritiated ligand.At oestrus, specific I-125-OTA binding was evident on the luminal epithelium of the caruncular and intercaruncular regions, on the epithelial cells lining the secretory uterine glands and in the stroma underlying the caruncular epithelium. In the myometrium diffuse labelling was evident in the outer longitudinal smooth muscle layer. At Day 4 of the cycle, binding to the stroma was diffuse and virtually absent from the glandular epithelium. No specific binding was evident in either tissue at Day 12 of the luteal phase, but by Day 14, prior to the decrease in peripheral progesterone concentrations, binding was again apparent on the luminal eptihelium only. Specific binding to the oviduct was localized to the smooth muscle layer of the isthmus region of oestrous ewes and was not detected at any other stage of the oestrous cycle.These studies extend our knowledge of the distribution of oxytocin binding sites in uterine and oviduct tissues throughout the oestrous cycle and suggest that oxytocin has an important role in stimulating oviduct and uterine motility at a time crucial to successful egg collection and/or sperm embryo transport.

KW - OXYTOCIN RECEPTORS

KW - MYOMETRIUM

KW - ENDOMETRIUM

KW - SHEEP

KW - RECEPTOR-BINDING

KW - EWE

KW - PREGNANCY

KW - RELEASE

M3 - Article

VL - 3

SP - 127

EP - 135

JO - Reproduction, Fertility and Development

JF - Reproduction, Fertility and Development

SN - 1031-3613

IS - 2

ER -