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Estradiol, progesterone, testosterone profiles in human follicular fluid and cultured granulosa cells from luteinized pre-ovulatory follicles.

Wen X, Li D, Tozer AJ, Docherty SM, Iles RK - Reprod. Biol. Endocrinol. (2010)

Bottom Line: With respect to oocyte recovery, no steroid showed a significant association in follicular fluid levels.Similarly no difference in follicular fluid steroid levels was found for those oocytes that did or did not fertilize.However, absolute steroid levels are associated with follicular size, not oocyte maturation/ability to fertilize.

View Article: PubMed Central - HTML - PubMed

Affiliation: Biomedical Sciences, School of Health and Social Science, Middlesex University, The Burroughs, NW4 4BT, UK.

ABSTRACT

Background: The production of sex steroids by follicular cells is proposed to be influenced by the maturity of the incumbent oocyte. Thus steroid levels may reflect suitability of an oocyte for IVF. We examined follicular fluids and granulosa cell production of steroid from IVF patients in order to test the relationship between steroid levels and fertilization.

Methods: Follicular fluid and granulosa cells were extracted from 206 follicles of 35 women undergoing controlled ovarian stimulation. Follicular fluid was assayed for estradiol, progesterone and testosterone. Granulosa cells were cultured from individual follicles and their culture media assayed for production of these hormones after 24 hrs in vitro. Levels of steroids were correlated with follicular diameter, oocyte recovery and subsequent fertilization.

Results: Follicular fluid levels of progesterone were 6100 times higher than that of estradiol, and 16,900 times higher that of testosterone. Despite the size of follicle triggered after controlled luteinization, the levels of progesterone and testosterone were maintained at relatively constant levels (median 98.1 micromoles/L for progesterone, and 5.8 nanomoles/L for testosterone). However, estradiol levels were slightly lower in the larger follicles (follicular diameter 10-15 mm, median 25.3 nanomoles/L; follicles > = 15 mm, median 15.1 nanomoles/L; linear correlation r = -0.47, p < 0.0001). With respect to oocyte recovery, no steroid showed a significant association in follicular fluid levels. Similarly no difference in follicular fluid steroid levels was found for those oocytes that did or did not fertilize. Significant quantities of progesterone were produced by the granulosa cells but production was constant regardless of the size of follicle from which the cells originated. Estradiol levels were only detectable in 10 of 121 cultures examined, and testosterone in none. Interestingly, when an oocyte was present follicular estradiol levels correlated with progesterone levels. However, when absent, follicular estradiol levels correlated with testosterone levels but not with progesterone.

Conclusions: The principle steroid product of luteinized pre-ovulatory granulosa is progesterone, a differentiation triggered by the gonadotropin surge. However, absolute steroid levels are associated with follicular size, not oocyte maturation/ability to fertilize.

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Follicular progesterone. Scatter plots to show the correlation of progesterone concentration (nmoles/L) (a) and total content (nmoles) (b) with the follicular diameter (mm). The concentration slightly decreased (4a: r = -0.15, p < 0.05) but its total content increased with follicular size (4b: r = 0.64, p < 0.0001).
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Figure 4: Follicular progesterone. Scatter plots to show the correlation of progesterone concentration (nmoles/L) (a) and total content (nmoles) (b) with the follicular diameter (mm). The concentration slightly decreased (4a: r = -0.15, p < 0.05) but its total content increased with follicular size (4b: r = 0.64, p < 0.0001).

Mentions: Testosterone concentration varied from 0.3-110.0 nmoles/L (median = 5.8 nmoles/L). The general trend was for testosterone concentration to remain constant despite follicular size (figure 3a). Consistent with this finding was that total testosterone content within each individual follicle increased with the size of the follicle (figure 3b: r = 0.52, p < 0.0001). Progesterone concentration varied from 1.1-1255.0 μmoles/L (median = 98.1 μmoles/L). Although the general trend was for progesterone concentration to remain constant despite follicular size (figure 4a), the total progesterone content of the follicles correspondingly increased (figure 4b: r = 0.64, p < 0.0001).


Estradiol, progesterone, testosterone profiles in human follicular fluid and cultured granulosa cells from luteinized pre-ovulatory follicles.

Wen X, Li D, Tozer AJ, Docherty SM, Iles RK - Reprod. Biol. Endocrinol. (2010)

Follicular progesterone. Scatter plots to show the correlation of progesterone concentration (nmoles/L) (a) and total content (nmoles) (b) with the follicular diameter (mm). The concentration slightly decreased (4a: r = -0.15, p < 0.05) but its total content increased with follicular size (4b: r = 0.64, p < 0.0001).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2958979&req=5

Figure 4: Follicular progesterone. Scatter plots to show the correlation of progesterone concentration (nmoles/L) (a) and total content (nmoles) (b) with the follicular diameter (mm). The concentration slightly decreased (4a: r = -0.15, p < 0.05) but its total content increased with follicular size (4b: r = 0.64, p < 0.0001).
Mentions: Testosterone concentration varied from 0.3-110.0 nmoles/L (median = 5.8 nmoles/L). The general trend was for testosterone concentration to remain constant despite follicular size (figure 3a). Consistent with this finding was that total testosterone content within each individual follicle increased with the size of the follicle (figure 3b: r = 0.52, p < 0.0001). Progesterone concentration varied from 1.1-1255.0 μmoles/L (median = 98.1 μmoles/L). Although the general trend was for progesterone concentration to remain constant despite follicular size (figure 4a), the total progesterone content of the follicles correspondingly increased (figure 4b: r = 0.64, p < 0.0001).

Bottom Line: With respect to oocyte recovery, no steroid showed a significant association in follicular fluid levels.Similarly no difference in follicular fluid steroid levels was found for those oocytes that did or did not fertilize.However, absolute steroid levels are associated with follicular size, not oocyte maturation/ability to fertilize.

View Article: PubMed Central - HTML - PubMed

Affiliation: Biomedical Sciences, School of Health and Social Science, Middlesex University, The Burroughs, NW4 4BT, UK.

ABSTRACT

Background: The production of sex steroids by follicular cells is proposed to be influenced by the maturity of the incumbent oocyte. Thus steroid levels may reflect suitability of an oocyte for IVF. We examined follicular fluids and granulosa cell production of steroid from IVF patients in order to test the relationship between steroid levels and fertilization.

Methods: Follicular fluid and granulosa cells were extracted from 206 follicles of 35 women undergoing controlled ovarian stimulation. Follicular fluid was assayed for estradiol, progesterone and testosterone. Granulosa cells were cultured from individual follicles and their culture media assayed for production of these hormones after 24 hrs in vitro. Levels of steroids were correlated with follicular diameter, oocyte recovery and subsequent fertilization.

Results: Follicular fluid levels of progesterone were 6100 times higher than that of estradiol, and 16,900 times higher that of testosterone. Despite the size of follicle triggered after controlled luteinization, the levels of progesterone and testosterone were maintained at relatively constant levels (median 98.1 micromoles/L for progesterone, and 5.8 nanomoles/L for testosterone). However, estradiol levels were slightly lower in the larger follicles (follicular diameter 10-15 mm, median 25.3 nanomoles/L; follicles > = 15 mm, median 15.1 nanomoles/L; linear correlation r = -0.47, p < 0.0001). With respect to oocyte recovery, no steroid showed a significant association in follicular fluid levels. Similarly no difference in follicular fluid steroid levels was found for those oocytes that did or did not fertilize. Significant quantities of progesterone were produced by the granulosa cells but production was constant regardless of the size of follicle from which the cells originated. Estradiol levels were only detectable in 10 of 121 cultures examined, and testosterone in none. Interestingly, when an oocyte was present follicular estradiol levels correlated with progesterone levels. However, when absent, follicular estradiol levels correlated with testosterone levels but not with progesterone.

Conclusions: The principle steroid product of luteinized pre-ovulatory granulosa is progesterone, a differentiation triggered by the gonadotropin surge. However, absolute steroid levels are associated with follicular size, not oocyte maturation/ability to fertilize.

Show MeSH