Autoradiograms off steroid metabolites from vitellogenic ovarian hair follicles of one’s bambooleaf wrasse incubated which have [7- 3 H]pregnenolone

Autoradiograms off steroid metabolites from vitellogenic ovarian hair follicles of one’s bambooleaf wrasse incubated which have [7- 3 H]pregnenolone

7 metabolites was separated from the thin level chromatography and build which have benzene:acetone (4:step one). step one, E1; 2, AD; step three, P5; cuatro, DHEA 17-P; 5, E2; 6, 1seven-P5; eight, 17,20?-P 17,21-P; and you may 8, 17,20?-P5. Select Table 1 to have steroid abbreviations.

Table 3

To determine the steroidogenic pathway out of E2 synthesis, five almost every other radiolabeled steroids were utilized since the precursors for inside vitro incubation regarding follicles. Of those four precursors, E2 are synthesized away from [ 14 C]DHEA, [ fourteen C]Advertising, and you can [ 3 H]E1. When follicles was indeed incubated having [ step three H]17-P, E2 wasn’t perceived since the metabolite, and you can a little bit of Post is actually put. Throughout incubations, T production couldn’t become thought, and you can [ fourteen C]T wasn’t totally converted to E2.

Dimension out of serum steroid accounts

Solution degrees of E2 and you can E1 showed comparable pages from inside the an excellent day’s spawning year (Fig. 2). During the time, if developmental phase of your biggest oocytes is actually LMN, solution E2 and E1 membership had been somewhat large (E2= ng/ml, E1= 5.08 ng/ml). But by hour, if stage of your premier oocytes was Yards, the levels fell (E2=5.03 ng/ml, E1=1.fifty ng/ml) and you can remained lingering membership on and you can time, in the event the levels of your largest oocytes have been TY and EMN, correspondingly (E2=6.00 ?6.27 ng/ml, E1=step one.step one5–step 1.79 ng/ml). Yet not, T and you may Ad membership have been lingering (T=1.22–step one.71 ng/ml, AD=1.23–1.43 ng/ml) for hours on end and you can didn’t disagree rather certainly ovarian amount (Fig. step 3).

Fig. 2

Changes in the serum levels of estradiol-17? (E2) and estrone (E1) in female bambooleaf wrasse sampled at different times of a day during the spawning season. Numbers indicate sample size. Each value is the mean±SEM. Statistically significant differences between groups are shown by different letters (P<0.05).

Fig. 3

Changes in serum amounts of testosterone (T) and you may androstenedione (AD) within the girls bambooleaf wrasse sampled in the different occuring times of a day for the spawning year. Number suggest take to dimensions. Per worthy of is the suggest±SEM.


This study reveals the newest steroidogenic pathway so you’re able to E2 synthesis from the ovarian hair follicles off bambooleaf wrasse (Fig. 4, vitellogenic path). During the last 2 decades, a good amount of studies into steroidogenesis during vitellogenesis, in numerous teleosts, possess incubated undamaged ovarian follicles or fragments or counted blood steroid membership. within the vitro incubation regarding ovarian follicles (amago fish Oncorhynchus rhodurus , Kagawa ainsi que al., 1982; goldfish, Kagawa ainsi que al., 1984; guppy Poecilia reticulata , Venkatesh et al., 1992; medaka Oryzias latipes, Kobayashi ainsi que al., 1996) or ovarian fragments (elizabeth.grams., Atlantic croaker Micropogonias undulatus , Trant and you will Thomas, 1989) presented one to E2 was synthesized through T. In different kinds, it’s been found you to definitely bloodstream E2 profile increase throughout vitellogenesis, also T account (e.g., plaice Pleuronectes platessa , Wingfield and you will Grimm, 1977; white sucker Catostomus commersori , Scott ainsi que al., 1984; spotted seatrout Cynoscion nebulosus , Thomas ainsi que al., 1987; purple seabream Pagrus significant, Matsuyama mais aussi al., 1988; gulf of mexico killifish Fundulus grandis , Greeley ainsi que al., 1988; sea bass Dicentrarchus labrax , Prat et al., 1990; demoiselles Chromis dispilus , Barnett and you will Pankhurst, 1994; striped bass Morone saxatilis , King mais aussi al., 1994; spiny damselfish Acanthochromis polyacanthus , Pankhurst ainsi que al., 1999). This research keeps provided me to the fresh new acknowledged take a look at one to T try a predecessor getting E2 manufacturing about teleost ovary. Inside our data, however, T was not developed by vitellogenic hair follicles just after incubation that have radiolabeled precursors, and exogenous T wasn’t converted to E2 in the hair follicles. These types of overall performance obviously imply that when you look at the bambooleaf wrasse T isn’t the newest predecessor to have E2 production from the vitellogenic follicles. In contrast, E1 are produced instead of T away from P5, DHEA, and you can Post, and you can exogenous E1 is converted directly into E2. The outcomes suggest that E2 is synthesized out of E1 about vitellogenic hair follicles. Furthermore, the fresh new solution steroid account, in which serum E2 levels shown a good diurnal beat one paralleled E1 membership however T membership, contain the inside vitro analysis. To your education, this is basically the basic declare that E1 ‘s the significant sub-stratum off E2 throughout the ovarian hair follicles into the a beneficial teleost.

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