Expression of P450(17α-hydroxylase) and P450(aromatase) genes in isolated granulosa, theca interna, and theca externa layers of chicken ovarian follicles during follicular growth

M. Kato, K. Shimada, Noboru Saito, K. Noda, M. Ohta

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49 Citations (Scopus)

Abstract

Concentrations of estradiol (E), testosterone (T), and progesterone (P) and levels of the 1.9-kb and 4.0-kb mRNA encoding P450(17α-hydroxylase) (P450(17α) and P450(aromatase) (P450(arom)), respectively, were measured in the isolated granulosa, theca interna, and theca externa of the largest preovulatory (F1-F4) follicles of the chicken 20 h and 3 h before expected ovulation of F1. In the granulosa layer, E and T concentrations remained low throughout this period of follicular growth, whereas P concentrations were high 3 h before ovulation in F2 and F1 follicles. E levels were highest in the theca interna and externa of the smallest (F4) follicle, decreasing progressively with follicular growth. T content of theca interna and granulosa was greater in less mature F4-F2 follicles than in the most mature (F1) follicle, whereas theca externa contained little T. P was quantifiable in significant amounts only in granulosa tissue, peaking in F2 and F1 follicles at 3 h before ovulation, at which time plasma levels of steroids also rose significantly. P450(17α) was expressed mainly in theca interna, whereas the P450(arom) mRNA levels found in theca externa reflected the pattern of E in this compartment. Expression of these two genes was very low in granulosa tissue, remaining unchanged during follicular growth. These results indicate that E and T synthesis in the chicken ovary is regulated, at least in part, at mRNA levels of P450(17α) and P450(arom) in the theca interna and theca externa layers during follicular growth.

Original languageEnglish
Pages (from-to)405-410
Number of pages6
JournalBiology of Reproduction
Volume52
Issue number2
DOIs
Publication statusPublished - 1995
Externally publishedYes

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Theca Cells
Aromatase
Ovarian Follicle
Mixed Function Oxygenases
Chickens
Growth
Genes
Ovulation
Messenger RNA
Progesterone
Testosterone
Ovary
Estradiol
Steroids

ASJC Scopus subject areas

  • Cell Biology
  • Developmental Biology
  • Embryology

Cite this

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title = "Expression of P450(17α-hydroxylase) and P450(aromatase) genes in isolated granulosa, theca interna, and theca externa layers of chicken ovarian follicles during follicular growth",
abstract = "Concentrations of estradiol (E), testosterone (T), and progesterone (P) and levels of the 1.9-kb and 4.0-kb mRNA encoding P450(17α-hydroxylase) (P450(17α) and P450(aromatase) (P450(arom)), respectively, were measured in the isolated granulosa, theca interna, and theca externa of the largest preovulatory (F1-F4) follicles of the chicken 20 h and 3 h before expected ovulation of F1. In the granulosa layer, E and T concentrations remained low throughout this period of follicular growth, whereas P concentrations were high 3 h before ovulation in F2 and F1 follicles. E levels were highest in the theca interna and externa of the smallest (F4) follicle, decreasing progressively with follicular growth. T content of theca interna and granulosa was greater in less mature F4-F2 follicles than in the most mature (F1) follicle, whereas theca externa contained little T. P was quantifiable in significant amounts only in granulosa tissue, peaking in F2 and F1 follicles at 3 h before ovulation, at which time plasma levels of steroids also rose significantly. P450(17α) was expressed mainly in theca interna, whereas the P450(arom) mRNA levels found in theca externa reflected the pattern of E in this compartment. Expression of these two genes was very low in granulosa tissue, remaining unchanged during follicular growth. These results indicate that E and T synthesis in the chicken ovary is regulated, at least in part, at mRNA levels of P450(17α) and P450(arom) in the theca interna and theca externa layers during follicular growth.",
author = "M. Kato and K. Shimada and Noboru Saito and K. Noda and M. Ohta",
year = "1995",
doi = "10.1095/biolreprod52.2.405",
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TY - JOUR

T1 - Expression of P450(17α-hydroxylase) and P450(aromatase) genes in isolated granulosa, theca interna, and theca externa layers of chicken ovarian follicles during follicular growth

AU - Kato, M.

AU - Shimada, K.

AU - Saito, Noboru

AU - Noda, K.

AU - Ohta, M.

PY - 1995

Y1 - 1995

N2 - Concentrations of estradiol (E), testosterone (T), and progesterone (P) and levels of the 1.9-kb and 4.0-kb mRNA encoding P450(17α-hydroxylase) (P450(17α) and P450(aromatase) (P450(arom)), respectively, were measured in the isolated granulosa, theca interna, and theca externa of the largest preovulatory (F1-F4) follicles of the chicken 20 h and 3 h before expected ovulation of F1. In the granulosa layer, E and T concentrations remained low throughout this period of follicular growth, whereas P concentrations were high 3 h before ovulation in F2 and F1 follicles. E levels were highest in the theca interna and externa of the smallest (F4) follicle, decreasing progressively with follicular growth. T content of theca interna and granulosa was greater in less mature F4-F2 follicles than in the most mature (F1) follicle, whereas theca externa contained little T. P was quantifiable in significant amounts only in granulosa tissue, peaking in F2 and F1 follicles at 3 h before ovulation, at which time plasma levels of steroids also rose significantly. P450(17α) was expressed mainly in theca interna, whereas the P450(arom) mRNA levels found in theca externa reflected the pattern of E in this compartment. Expression of these two genes was very low in granulosa tissue, remaining unchanged during follicular growth. These results indicate that E and T synthesis in the chicken ovary is regulated, at least in part, at mRNA levels of P450(17α) and P450(arom) in the theca interna and theca externa layers during follicular growth.

AB - Concentrations of estradiol (E), testosterone (T), and progesterone (P) and levels of the 1.9-kb and 4.0-kb mRNA encoding P450(17α-hydroxylase) (P450(17α) and P450(aromatase) (P450(arom)), respectively, were measured in the isolated granulosa, theca interna, and theca externa of the largest preovulatory (F1-F4) follicles of the chicken 20 h and 3 h before expected ovulation of F1. In the granulosa layer, E and T concentrations remained low throughout this period of follicular growth, whereas P concentrations were high 3 h before ovulation in F2 and F1 follicles. E levels were highest in the theca interna and externa of the smallest (F4) follicle, decreasing progressively with follicular growth. T content of theca interna and granulosa was greater in less mature F4-F2 follicles than in the most mature (F1) follicle, whereas theca externa contained little T. P was quantifiable in significant amounts only in granulosa tissue, peaking in F2 and F1 follicles at 3 h before ovulation, at which time plasma levels of steroids also rose significantly. P450(17α) was expressed mainly in theca interna, whereas the P450(arom) mRNA levels found in theca externa reflected the pattern of E in this compartment. Expression of these two genes was very low in granulosa tissue, remaining unchanged during follicular growth. These results indicate that E and T synthesis in the chicken ovary is regulated, at least in part, at mRNA levels of P450(17α) and P450(arom) in the theca interna and theca externa layers during follicular growth.

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