PROFILES OF PLASMA SEX STEROIDS AND GONADOTROPIN IN COHO SALMON, ONCORHYNCHUS-KISUTCH, DURING FINAL MATURATION
PROFILES OF PLASMA SEX STEROIDS AND GONADOTROPIN IN COHO SALMON, ONCORHYNCHUS-KISUTCH, DURING FINAL MATURATION
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DOI：
10.1016/0016-6480(86)90054-7
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发表时间：
1986-06-01
影响因子：
2.7
通讯作者：
SCHRECK, CB
中科院分区：
文献类型：
--
作者：
FITZPATRICK, MS;VANDERKRAAK, G;SCHRECK, CB
雌二醇-17 α的血浆浓度(E2)，17 μ。羟基-20 β-测定了银鲑（Oncorhynchus kisutch）在产卵季节性腺成熟过程中的孕酮、二氢孕酮（DHP）、11-酮睾酮（11-KT）、睾酮（T）和促性腺激素（GtH）。E2的浓度较高，在女性的鸡蛋显示中央（预迁移）germinal囊泡，迁移germinal囊泡，或周边germinal囊泡比在鱼的鸡蛋经历了germinal囊泡破裂或排卵。相反，血浆中的DHP水平低，在中央，迁移，和周边germinal囊泡阶段，然后显着增加germinal囊泡破裂和排卵。11-KT，T和GtH的水平一般随卵成熟度的提高而增加。当时间，而不是成熟度作为一个变量，血浆E2是高的女性第一次从海洋中返回，但随后在运行结束时采样的鱼急剧下降。血浆DHP遵循相反的模式，在运行早期采样的鱼中低，在运行后期采样的鱼中高。其他类固醇和GtH的曲线没有出现容易辨别的模式，尽管浓度发生了一些显著变化。即使采样开始的时候，鲑鱼第一次从海洋中返回，大多数激素是不可变的男性时，根据采样日期或主要细胞类型的睾丸，这表明男性非常接近最终成熟在采样期间。血浆中的DHP水平在生产精液的男性中高于任何其他男性群体。11-KT的浓度高于所有男性的T，但没有模式的类固醇水平出现。
The plasma concentrations of estradiol-17.alpha. (E2), 17.mu.-hydroxy-20.beta.-dihydroprogesterone (DHP), progesterone, 11-ketotestosterone (11-KT), testosterone (T) and gonadotropin (GtH) were measured in adult coho salmon (Oncorhynchus kisutch) concomitantly with advancing maturation of the gonads during the spawning season. Concentrations of E2 were higher in females with eggs showing central (premigrating) germinal vesicles, migrating germinal vesicles, or peripheral germinal vesicles than in fish in which the eggs had undergone germinal vesicle breakdown or ovulation. Conversely, plasma levels of DHP were low at central, migrating, and peripheral germinal vesicle stages and then increased dramatically at germinal vesicle breakdown and ovulation. Levels of 11-KT, T, and GtH generally increased with advancing maturity of the eggs. When time rather than degree of maturation was used as a variable, plasma E2 was high in females first returning from the ocean but then dropped off precipitously in fish sampled at the end of the run. Plasma DHP followed the opposite pattern, being low in fish sampled early in the run and high in fish sampled late in the run. No easily discernible patterns emerged from the profiles of the other steroids and GtH, although some significant variation in the concentrations occurred. Even though sampling was initiated at the time when the salmon first returned from the ocean, most of the hormones were not variable in males when viewed according to sampling date or predominant cell type in the testes, which indicates that the males were extremely close to final maturity during the sampling period. Plasma levels of DHP were higher in males that were producing milt than in any other group of males. Concentrations of 11-KT were higher than those of T in all males, but no patterns in the levels of either steroid emerged.