During the vitro follicle incubation having radiolabeled steroid precursors
Fish and testing
From inside the spawning season (late booleaf wrasse had been trapped from the link and you will range into the seaside seas near the Fisheries Search Research, Kyushu College or university and transferred to the latest laboratory. Fish was in fact stored in five-hundred-litre fiberglass tanks which have blocked seawater, lower than natural big date-duration and you will liquid temperatures, and provided krill and live hermit crab daily. Immediately following guaranteeing everyday spawning, cuatro–six people fish (weight – grams, overall duration 11step three–159 mm) had been sampled on , , , and you will hours. Fish was anesthetized with 2-phenoxyethanol (3 hundred ppm), and you will bloodstream products was indeed obtained from the caudal watercraft playing with syringes installing that have twenty five-grams to own 20 minute. The brand new split solution try held at the ?30°C up to assayed getting steroid level. Just after bloodstream sampling, seafood were killed by decapitation, while the ovaries was basically dissected away. Getting ovarian histology, brief ovarian fragments was repaired within the Bouin’s services, dehydrated, and you will embedded from inside the Technovit resin (Kulzer, Wehrheim). The fresh developmental degree from oocytes was in earlier times said (Matsuyama ainsi que al., 1998b).
The newest developmental level of your own prominent oocytes regarding the fish collected in the , , and you will hr was basically tertiary yolk (TY), very early migratory nucleus (EMN), and you can later migratory nucleus (LMN) values, correspondingly. The greatest hair follicles on seafood sampled at hour, where germinal vesicle description (GVBD) had already took place and the cytoplasm try clear because of yolk proteolysis and hydration, was named adult (M) phase.
To possess light microscopy, 4-?m-heavy parts was in fact cut and you can discolored that have step 1% toluidine bluish soluton
Ovarian follicles collected at hr were used for in vitro incubation with radiolabeled steroid precursors. After decapitation, the ovaries were removed and placed in ice-cold Ringer’s solution (140 mM NaCl, 5 mM KCl, 2 mM CaCl2, 0.8 mM MgSO4, 1.5 mM NaH2PO4, 2 mM NaHCO3, 20 mM Hepes, pH adjusted to 7.5 with 1 N NaOH). The largest follicles (n=250) were isolated and gathered with forceps and pipettes. After removing of excess solution, follicles were frozen in liquid nitrogen and stored at ?80°C until use. Our preliminary experiments revealed that there was little difference in the steroid metabolic patterns during the incubation https://datingranking.net/es/citas-fetichistas-de-pies/ with frozen and intact follicles.
250 follicles were placed in a 10-ml glass tube with 1 ml of sucrose buffer (250 mM sucrose, 20 mM Hepes, pH adjusted to 7.6 with 1 N NaOH). Ten pmol of [ 3 H]P5, [ 3 H]17-P, [ 14 C]DHEA, [ 14 C]AD, [ 14 C]T, or [ 3 H]E1 were dissolved in 150 ?l sucrose buffer. Coenzymes (NAD, NADH, NADP, and NADPH; 10 mM each) were dissolved in a solution that consisted of 100 ?l MgCl2 (20 mM) and 50 ?l citrate buffer (5 mM, pH 7.3). At the start of incubation, both radiolabeled precursor and coenzymes solutions were added to the incubation media. Incubations were performed at 20°C for 2 hr with constant shaking. At the end of incubation, steroids were extracted three times from the media with 4 ml dichloromethane. The extract was concentrated and applied to a thin layer chromatography (TLC) plate (60F254; Merck, Darmstadt, Germany) with non-radioactive standard steroids, i.e., E1, E2, AD, T, progesterone, 17-P, and 17,20?-dihydroxy-4-pregnen-3-one (17,20?-P), and then developed in benzene:acetone (4:1). Radioactive steroid metabolites were analyzed with a BAS 1500 bio-imaging analyzer (Fuji Film, Tokyo), and standard E1 and E2 were visualized by exposure to iodine vapor. Other standard steroids were detected by UV absorption at 254 nm. Radioactive steroids were scraped from the TLC plates and extracted three times with 3 ml diethyl ether. Some radioactive metabolites were further separated in different solvent systems. Radiolabeled steroid metabolites were identified by their chromatographic mobility in TLC and by recrystallization as described by Axelrod et al. (1965).