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为研究促卵泡激素受体基因(FSHR)在施氏鲟(Acipenser schrenckii)性腺分化过程中的表达、分布及调控作用,采用反转录聚合酶链式反应(RT-PCR)和RACE技术克隆得到施氏鲟促性腺激素(FSHR)基因的全长cDNA序列,并对其编码氨基酸序列的特征、基因表达及调控作用进行了分析。结果显示:施氏鲟FSHR基因的cDNA全长为2696 bp,编码661个氨基酸,属于含有信号肽、跨膜结构且分泌到细胞外的疏水性蛋白。氨基酸同源性及进化分析表明,施氏鲟与小体鲟(A.ruthenus)FSHR序列一致性最高,亲缘关系最近。PCR结果显示,FSHR mRNA的表达具有广泛性,各组织中均有表达,但在性腺、垂体中的表达量较高,显著高于其他组织中的表达量。LHRH-A注射实验显示:不同浓度组中,施氏鲟性腺组织中FSHR mRNA的表达量呈先升高后降低的变化趋势;与对照组相比,1μg/kg组在诱导3 d时性腺组织中FSHR mRNA的表达量达到最高,极显著高于3μg/kg和5μg/kg组。与性腺组织中FSHR mRNA表达模式不同,垂体中FSHR mRNA的表达呈升高后降低趋势,3μg/kg组在注射后第3天达最大值。综上结果表明,LHRH-A可通过调控FSHR的表达参与施氏鲟的早期性腺发育。 相似文献
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为了探讨在古老的软骨硬鳞鱼中促性腺激素(GtH)的双重内分泌调节作用,本实验设计用离体灌流的方法研究促黄体素释放激素类似物(LHRH-A)和多巴胺(DA)对施氏鲟脑垂体碎片分泌GtH的影响。引入10、100和1 000 nmol/L 3个浓度的LHRH-A对施氏鲟脑垂体碎片3次脉冲式刺激实验;每次间隔1 h,持续5 min,研究不同剂量LHRH-A对鲟鱼脑垂体释放GtH的作用;用200 nmol/L DA对施氏鲟脑垂体碎片持续2 h灌流后引入5 min的1 000nmol/L LHRH-A刺激实验,研究DA如何抑制鲟鱼脑垂体释放GtH。每5 min收集一管灌流液,用放射免疫测定法(RIA)检测灌流液中GtH的含量。结果显示,低剂量LHRH-A随着刺激引入脑垂体释放GtH出现波浪式的增加,中、高剂量出现释放延后现象。LHRH-A在10nmol/L到1 000 nmol/L范围内对刺激脑垂体释放GtH没有剂量依存关系。DA对施氏鲟脑垂体碎片GtH的分泌没有显著影响,但是可以抑制LHRH-A引起的GtH分泌,即DA不能抑制施氏鲟GtH的基础分泌,而只能抑制LHRH-A诱导的GtH分泌。研究结果证明,在高等硬骨鱼类中存在的双重神经内分泌调节在古老的鲟鱼中也存在。 相似文献
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对花鲈(Lateolabrax japonicas)成鱼腹腔注射促黄体激素释放激素类似物(LHRH-A3)和人体绒毛膜促性腺激素(HCG),利用放射性免疫激素测定方法(RIA)检测了花鲈血清中类胰岛素生长因子(Insulin-like growth factor 1,IGF-1)在注射后6、12、24、48 h内的变化情况,同时还利用荧光实时定量PCR技术检测了花鲈肝脏中IGF-1和类胰岛素生长因子结合蛋白1(Insulin-like growth factor-binding protein 1,IGFBP-1)mRNA的相对表达量的变化情况。结果表明,注射LHRH-A3的花鲈血清中IGF-1的含量在24 h后出现了明显的降低(P0.05),而花鲈肝脏中IGF-1 mRNA的相对表达量在注射6 h后较对照组明显升高(P0.05),而肝脏中IGFBP-1 mRNA的相对表达量则呈现下降趋势。注射HCG的花鲈血清中IGF-1的含量在注射后12 h出现了明显降低(P0.05),24 h后血清中IGF-1含量持续降低。肝脏中IGF-1 mRNA的相对表达量在注射后的24 h内均保持稳定,而在处理后的48 h出现了显著上升(P0.05)。肝脏中IGFBP-1 mRNA的相对表达量在注射后12h检测到显著升高(P0.05)。研究结果表明,LHRH-A3和HCG均可以通过直接或间接的刺激作用来触发花鲈IGF系统的应答反应,但是其中具体机制尚不明了。 相似文献
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以珠江流域鲇为研究对象，分别在性腺发育早期、性腺发育晚期、性腺发育成熟与产卵前期、性腺退化期注射促黄体素释放激素类似物和多巴胺D2受体拮抗物，处理后6h、12h、24h测定血液中的促性腺激素水平变化。结果表明，在性腺发育的各个时期，促黄体素释放激素类似物和多巴胺D2受体拮抗物联合注射能显著剂激鲇促性腺激素分泌；鲇脑垂体促性腺激素的分泌受下丘脑释放的促性腺素释放激素和多巴胺的双重调节，多巴胺只能抑制促性腺素释放激素诱导的促性腺激素分泌。在建立鲇人工繁殖技术时，可采用促黄体素释放激素类似物和多巴胺D2受体拮抗物联合注射方法。 相似文献
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暗纹东方鲀生殖洄游期性腺发育特点及人工繁殖的研究 总被引：3，自引：1，他引：2
１９９６～１９９８年,作者从长江下游扬中段采捕暗纹东方鱼屯亲鱼,经暂养促熟处理（微流水刺激、投喂鲜活饵料、不定期注射适量的ＬＨＲＨ－Ａ２）,雌鱼的性腺可发育到Ⅳ期末,对外源激素能引起正常的排卵反应。同时观察了Ⅲ、Ⅳ、Ⅴ期性腺发育的特点。催产药物为ＬＨＲＨ－Ａ２和ＰＧ,三针注射,雌鱼剂量为３５ｍｇＰＧ＋６０μｇＬＨＲＨ－Ａ２／ｋｇ,雄鱼剂量减半。在水温１８～２２℃的条件下,效应时间为１０～３６小时;在２１～２２℃时,胚胎发育时间为１３９～２１０小时。１９９７～１９９８年的平均受精率为８３４％,平均孵化率为７８０％。 相似文献
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Hao-Ren Lin Chun Peng Long-Zhi Lu Xi-Juan Zhou Glen Van Der Kraak R.E. Peter 《Aquaculture (Amsterdam, Netherlands)》1985,46(4):333-340
The effects of intraperitoneal injections of [D-Ala6, Pro9-N-ethylaminde]-luteinizing hormone releasing hormone (LHRH-A) and pimozide (PIM), a dopamine receptor antagonist, on ovulation in loach were investigated. LHRH-A and PIM administered separately were ineffective in inducing ovulation. However, injections of PIM and LHRH-A simultaneously or the injection of PIM 2.5–3 h prior to LHRH-A were highly effective means of inducing ovulation. The simultaneous injection of PIM (1.0 μg/g body wt) and LHRH-A (0.05 μg/g body wt) resulted in a greater ovulatory response than injection of carp pituitary extract (1 pituitary/fish). 相似文献
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黄颡鱼人工繁殖及鱼苗培育试验 总被引：7，自引：0，他引：7
以鲜鱼虾肉、自制配合料为饵料，在室内和室外水泥池内进行黄颡鱼亲鱼培育；采用DOM、PG、LHRH－A2、HCG不同剂量组合进行人工催产；采用静水和微流水两种方法进行孵化。在孵化网箱内进行鱼苗培育。结果表明：黄颡鱼亲鱼喜食新鲜饵料，也易驯食配合饲料，室内和室外人工条件下均能获得成熟亲鱼；用DOM＋HGG＋LHRH－A2或PG＋HCG＋LHRH－A2的混合剂人工催产，微流水孵化效果较好，催产率为50％－1005，受精率为60％－90％，孵化率达70％－90％；小网箱培育鱼苗，成活率高，规格整齐。 相似文献
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中华鲟piwil1基因的克隆表达特征研究 总被引：1，自引：0，他引：1
Piwi是鱼类配子发生和性腺发育的重要调控因子。本研究从中华鲟(Acipenser sinensis)性腺中克隆得到了piwi基因的全长c DNA序列,该序列长3 393 bp,开放阅读框为2 583 bp,编码860个氨基酸。氨基酸序列多重对比发现,该序列具有PAZ和PIWI保守结构域,与其他鱼类piwil具有较高同源性;系统进化分析显示,中华鲟piwil聚于piwil1分支;因此,所得序列为piwi-like 1基因,命名为Aspiwil1。荧光定量PCR研究表明,Aspiwil1为母源表达,且其表达量随着胚胎发育逐渐降低;Aspiwil1在性腺中大量表达,在脑组织中也有较低水平的表达。性腺组织切片RNA原位杂交结果表明,Aspiwil1仅在生殖细胞表达,且其杂交信号随着卵子发生逐渐增强、精子发生逐渐减弱。本研究为中华鲟配子发生过程中Aspiwil1的功能研究提供了基础。 相似文献
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Yun Li Xiaochun Liu Yong Zhang Xilan Ma Haoran Lin 《Fish physiology and biochemistry》2013,39(3):605-613
Effects of cysteamine (CS) on growth hormone (GH) mRNA, two types of growth hormone receptor (GHR) mRNAs and growth rate in orange-spotted grouper (Epinephelus coioides) were investigated. CS could cause a modification in the structure of somatostatin, which is the most important neuroendocrine inhibitor of basal and stimulated growth hormone synthesis and release, and renders it nonimmunoreactive probably through interaction with the disulfide bonds. In the present study, cysteamine hydrochloride (CSH) enhanced the level of pituitary GH mRNA in a dose-dependent manner through attenuating or deleting the inhibiting action of somatostatin on GH mRNA expression. CSH at relatively low doses (from 1 to 3 mg/g diet) enhanced the levels of two types of GHR mRNAs in dose-dependent manner, whereas the stimulation induced by CSH declined from the peak at higher dose of CSH (4 mg/g diet). It might be attributed to the variation in GH-induced up-regulation of GHRs at different doses of GH. Feeding of CSH could induce remarkable enhancement of growth rate in orange-spotted grouper. In addition, the stimulatory effect of CSH could be potentiated by the additive effect of luteinizing hormone-releasing hormone analog (LHRH-A). Compared with individual treatments, combined feeding of CSH and LHRH-A caused more efficient elevation of growth rate after 8 weeks of feeding. CSH and LHRH-A individually and in combination remarkably increased the levels of GH and GHR mRNAs compared with the control. The combined administration of CSH and LHRH-A in diet was most effective to enhance the level of GH and GHR1 mRNA. The morphological characteristics of the experimental fish were evaluated. Compared with control, the ratios of muscle RNA/DNA, condition factors (CF) and feed conversion efficiency (FCE) were significantly enhanced in the treated groups, while the highest values were observed in the combined treatment. All the results suggested that CSH (1–3 mg/g diet) is an effective, economical and feasible feed additive in orange-spotted grouper culture. 相似文献
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异齿裂腹鱼人工规模化繁殖技术研究 总被引：5，自引：1，他引：4
2010年4～6月,对野生异齿裂腹鱼(Schizothorax o' connori)人工规模化繁殖技术进行研究,并初步进行产后亲鱼恢复培养技术研究.对108尾雌鱼进行干法人工授精,共采卵104万多粒,孵出仔鱼62万多尾.其中45尾雌亲鱼自然成熟,共采卵46.8万多粒,平均受精率和孵化率低于人工催产雌鱼卵.人工催产83... 相似文献
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Artificial propagation of Monopterus albus (Zuiew) was conducted during their spawning season in the present study. Different doses of luteinizing-hormone-releasing-hormone analogue (LHRH-A) were tested for inducing the ovulation of brood females. No significant difference was found in the degree-hours and fertilization rates between three different doses (0.1, 0.2 and 0.3 μg LHRH-A g-1 fish). A fertilization solution of 0.3% NaCl produced significantly higher fertilization rates than the other three solutions (0.5% NaCl, 0.65% NaCl and water). Fertilization times ranging from 5 to 2 0 min gave no significant difference in the fertilization rates. The embryonic and larval development of M. albus was observed and illustrated. The hatching time of eggs of M. albus was about 140 h in the 28-3 0oC water temperature range. Using Tubifex spp. for the first food for the larval nursery gave higher growth rate than two other foods, zooplankton and artificial food. 相似文献
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用兔抗促黄体素生成素受体(LHR)或称绒毛膜促性腺激素受体(CGR)、雌激素受体(ER)和孕激素受体(PR)的抗体对LHR,ER和PR进行免疫组织化学定位。目的在于揭示外源性促性腺激素(鲤鱼脑垂体提取物,CPE和人绒毛膜促性腺激素,hCG)诱发日本鳗鲡卵子发生和卵母细胞成熟的内分泌机制。结果表明,注射激素前后卵巢发育和卵子发生出现了十分显著的变化。卵巢组织学切片观察显示激素处理前鳗鲡卵巢发育处于卵黄发生早期,卵母细胞平均直径(220±0.01)μm。第一次注射这两种激素后10d,实验组卵母细胞中卵黄核分散在核的周围,核仁数量显著增加,多达18～20个左右,而对照组8～10个。第3和4次激素处理后,卵母细胞发育进入卵黄发生早-中期至中期,卵黄颗粒数量增加。第6和7次激素处理后,卵母细胞进入卵黄发生中后期到成熟期,卵母细胞胞质中充满卵黄颗粒,胞径和核径增加,分别为(570±1.39)μm和(128±1.19)μm,而对照组没有变化。其次,免疫组织化学染色结果显示LHR、ER和PR均定位在鳗鲡卵巢中卵母细胞胞质、核膜、核质、卵被膜和体细胞上。这里值得指出的是,从第3次和第4次激素处理后,这三种受体的定位各有特点,L... 相似文献
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为进一步提高半滑舌鳎(Cynoglossus semilaevis)人工育苗技术的水平,对半滑舌鳎新型膜孕激素受体(mPR-like,mPRL)基因的表达特征和作用机制进行了研究.应用实时定量PCR方法分析mPRL mRNA在卵子形成过程中的时序表达,发现半滑舌鳎mPRL mRNA相对表达量的最高值出现在性成熟阶段卵巢的Ⅴ时相卵母细胞.原位杂交分析mPRL mRNA在繁殖相关组织的细胞学定位,发现mPRL mRNA分布在半滑舌鳎性成熟阶段卵巢的卵母细胞膜上;在脑的神经元和垂体内分散的细胞中,mPRL mRNA阳性信号较强.制备半滑舌鳎mPRL的多克隆抗体,采用Westem blotting方法检测半滑舌鳎mPRL蛋白在不同组织的表达特征,发现mPRL蛋白的表达量在卵巢、脑、垂体中相对较高,在肝脏、头肾、肾脏中表达量相对较少.免疫组化结果显示,半滑舌鳎mPRL蛋白在卵巢、脑和垂体的细胞学定位与mPRL mRNA定位一致.应用实时定量PCR和Westem blotting方法检测促性腺激素调控下半滑舌鳎不同时相卵母细胞mPRL基因mRNA和蛋白的表达变化,结果显示,促性腺激素对半滑舌鳎卵母细胞中mPRL基因mRNA和蛋白表达都有一定的上调作用,特别是对Ⅴ时相卵母细胞中mPRL mRNA和蛋白的表达量提升明显;发现表达量与促性腺激素调控作用具有剂量依存关系.半滑舌鳎mPRL在繁殖相关组织的表达特征表明其通过脑-垂体-卵巢轴参与繁殖调控,同时也揭示了mPRL介导卵母细胞成熟机制. 相似文献
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采用放射免疫测定方法（RIA）测定石鲽（Kareius bicoloratus）生殖季节血浆雌二醇（estradiol）含量,观察注射外源激素促黄体激素释放激素类似物（LHRH-A）后血浆E2含量变动。结果表明,注射LHRH-A后6 h血浆E2水平显著升高,12 h显著下降,24 h略有下降,48 h回升但尚未达到处理前水平;对照组血浆E2含量在注射生理盐水（PS）后6 h显著下降,12 h、24 h持续下降,48 h略有回升但低于处理组。说明LHRH-A能有效促进血浆E2的产生和释放,但E2的产生和释放会受到环境胁迫和在实验过程中产生的操作胁迫作用的影响。 相似文献
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多巴胺拮抗物 pimozide(PIM)或排除剂 reserpine(RES)和促黄体素释放激素类似物(LHRH-A)诱导养殖鱼类促性腺激素分泌和排卵的研究 总被引：2，自引：0，他引：2 
下载免费PDF全文
下载免费PDF全文 由多巴胺拮抗物PIM或排除剂RES组成的高效新型鱼类催产合剂能有效的诱导主要的淡水养殖鱼类促性腺激素分泌和产卵，其中青鱼催产率为80％，鲢鱼为84％，鳙鱼和草鱼为88％，长春鳊为94％，鲮鱼为96％。试验表明这种催产剂的主要优点是：催产效果高而稳定，可以完全取代鱼脑垂体；对当年第二次成熟和产卵的亲鱼同样有效；有利于保护亲鱼；节省劳力和成本。 相似文献
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ABSTRACT: The annual reproductive cycle, including the first maturity of ovarian development and plasma levels of testosterone (T) and estradiol-17β (E2), was examined in female Japanese catfish Silurus asotus reared under natural conditions. In addition, the possible period that final oocyte maturation and ovulation can be induced by human chorionic gonadotropin (hCG) injection were investigated. Results showed that female Japanese catfish matured 1 year after hatching under reared conditions. The beginning of vitellogenesis was in March and ovarian development and plasma T and E2 levels peaked in June. Thereafter, the gonadosomatic index gradually decreased to October and regression of oocytes at the tertiary yolk globule stage was observed. Female Japanese catfish could be induced to final oocyte maturation and ovulation by hCG treatment during the period from June to September. In addition, the fertilization rates were relatively high and stable during this period. These results suggest that yearling female Japanese catfish can be used as brood stock for seed production. This is the first study to investigate the annual reproductive cycle in Japanese catfish. These data will provide useful information regarding brood stock management and seed production. 相似文献
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N. W. Pankhurst G. van der Kraak R. E. Peter B. Breton 《Fish physiology and biochemistry》1986,1(3):163-170
Male goldeye were treated with (D-Ala6, Pro9-N ethylamide) — LHRH (LHRH-A) in saline or a silastic pellet (100 µg.kg–1 body weight) and changes in plasma gonadotropin (GtH), 17,20-dihydroxy-4-pregnen-3-one (17,20P) and testosterone (T) levels were determined by radioimmunoassay. LHRH-A increased plasma GtH levels, with the response to LHRH-A in saline being of much greater magnitude and duration than the response to silastic pellet implants. Seasonal differences were found in the response to LHRH-A. Spermiated fish were the most responsive, recrudescing fish the least, and regressed fish displayed an intermediate response. Plasma 17,20P levels were elevated in response to LHRHA in fish of all sexual stages although the magnitude of the increase was not related to the magnitude of the increase in GtH levels. Treatment with LHRH-A also resulted in a transitory increase in plasma T levels. The endocrine control of GtH and steroid secretion in goldeye is discussed in relation to studies in cyprinids and salmonids.
Address for reprint requests: Department of Zoology, University of Alberta, Edmonton, Alberta T6G 2E9 Canada. 相似文献
20.
Falahatkar Bahram Javid Rahmdel Kamyar Rasouli Kargar Eshagh Gholami Shapoor 《Aquaculture International》2022,30(1):73-85
The aim of the present study was to evaluate the effects of hCG injections on reproductive efficiency by hCG treatment in both male or female brooders of domesticated pikeperch (Sander lucioperca) in the first generation. The study consisted of four treatments based on hormone injection to male or female brooders including T1: both sexes were injected, T2: only females were injected, T3: only males were injected, and T4: without hormone injection. Each treatment which included 14 males and 12 females were introduced to a single rectangular concrete tank with one spawning nest for each mate (a total of 12 nests per tank). Fish were injected by a single dose of 200 IU/kg hCG before transferring to mating tanks. After mating, nests containing fertilized eggs were transferred to circular concrete tanks for incubation and hatching of embryos. According to the results, treatments T3 and T4 did not respond to hormonal stimulation and no fish were spawned. Treatments T1 and T2 showed a positive response to hormone injection. Latency time, fertilization rate, and hatching rate showed no significant difference between T1 and T2 (P?>?0.05), but the number of responded females was significantly higher in T2 (P?<?0.05). The results of the present study demonstrated that it is possible to perform the semi-artificial propagation of domesticated pikeperch via injecting with 200 IU/kg hCG just to females, without the need for hormonal stimulation for males.
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