Solubilized human thyrotrophin receptors behave as one class of high-affinity binding sites

Evidence is presented justifying the conclusion that, in contrast to the dextran-coated charcoal technique, the widely used technique of separating bound and free TSH with polyethylene glycol is inadequate and yields inaccurate results. Optimum values for the concentration of Triton X-100, pH, salts, temperature and time of incubation were established for the TSH-TSH receptor interaction. According to Scatchard analysis, soluble TSH receptors behaved as one class of binding sites. The affinity constant for this class of binding sites (K_a 1.3 × 10⁹ M^?1) is identical to that for the high-affinity binding sites found in human thyroid membranes (K_a 1.2 × 10⁹ M^?1). No low-affinity binding sites could be detected after solubilization of membrane receptors. Chromatography experiments on Sepharose CL-6B indicated that, in excess TSH, each micelle containing TSH receptors (molecular weight 150000) binds 4 [¹²⁵I]TSH molecules. These data, together with the absence of low-affinity binding sites, led to the hypothesis that high-affinity TSH binding sites may be formed by the clustering of 4 low-affinity binding sites. Cross-reactivity experiments showed that both α- and β-subunits are involved in the binding of TSH to its receptor; the TSH β-subunit showed an increased cross-reactivity with soluble receptors.     

酒精性肝硬化患者血清内毒素、IL-6、IL-8和PRL检测的临床意义

目的:探讨了酒精性肝硬化患者血清内毒素、IL-6、IL-8和PRL水平的变化及临床意义。方法:采血鲎试验、放射免疫分析对31例酒精性肝硬化患者进行了血清内毒素、IL-6、IL-8和PRL的检测,并与35名正常人作比较。结果:酒精性肝硬化患者血清内毒素、IL-6、IL-8和PRL水平均非常显著地高于正常人组(P<0.01),且血清内毒素水平与IL-6、IL-8和PRL水平呈正相关(r=0.4788、0.5126.0.6137,P<0.01)。结论:检测酒精性肝硬化患者血清内毒素、IL-6、IL-8和PRL水平的变化,对该病的诊断、治疗和预后观察均有一定的临床实用价值。     

Oxytocin does not modify GH, ACTH, cortisol and prolactin responses to Ghrelin in normal men

Background

In order to test the possible effect of Oxytocin (OT) on Ghrelin-stimulated GH, PRL, ACTH and cortisol, ten healthy normal men were studied.

Methods

Tests: Ghrelin (0.2 μg/kg body weight (BW)) as an iv bolus; Ghrelin plus OT (2 IU as bolus plus 0.07 IU/min administered for 90 min).

Results

The administration of OT did not change GH, PRL, ACTH and cortisol release induced by Ghrelin.

Conclusions

The data suggests that in humans OT did not modulate the GH, PRL, ACTH and cortisol response to Ghrelin.     

PCOS患者血浆leptin和血清T、E2、FSH、LH、PRL检测的临床意义

目的：探讨多囊卵巢综合征（PCOS）患者血浆leptin和血清T、E2、FSH、LH、PRL水平的变化及临床意义。方法：应用放射免疫分析和发光法对31例PCOS患者进行了血浆leptin和血清T、E2、FSH、LH、PRL测定,并以正常妇女作对照。结果：PCOS患者血浆leptin和血清T、LH、PRL水平非常显著地高于正常妇女组（P〈0.01）,FSH、E2水平与正常妇女组比较无显著性差异（P〉0.05）,且血浆leptin水平与血清T、LH、PRL水平呈正相关（r=0.5784、0.5411、0.6082,P〈0.01）。结论：检测PCOS患者血浆leptin和血清T、E2、FSH、LH、PRL水平的变化与疾病的发生和发展密切相关。     

Ghrelin and reproductive disorders

Ghrelin is an important factor involved in most of the metabolic and hormonal signals which adapt the reproductive functions in conditions of altered energy balance. Moreover, the coordinated role of leptin and ghrelin appears in fact to have a specific role in the regulation of puberty. Systemic action of ghrelin on the reproductive axis involves the control of the hypothalamic-pituitary-gondal axis. In addition, it has been shown that ghrelin may directly act at a gonadal level in both females and males. Available data also demonstrate that sex steroid hormones and gonadotropins may in turn regulate the gonadal effect of ghrelin, as documented by studies performed in females with the polycystic ovary syndrome and in hypogonadal men. Notably, recent studies also confirm a potentially important role for ghrelin in fetal and neonatal energy balance, and specifically in allowing fetal adaptation to an adverse intrauterine environment.     

乳腺癌患者血清 PRL 及癌细胞 PRL-R与预后因素相关性的比较

目的 :对乳腺癌患者血清PRL及癌组织PRL R与预后因素的相关性进行比较研究。方法 :采用受体放射配基结合分析法及放射免疫分析法分别测定 94例乳腺癌患者细胞PRL R含量 (≥ 2 0fmol/mg蛋白为受体阳性 )和 75例患者血清PRL含量 (>2 5μg/L为激素阳性 )。统计分析两者与乳腺癌预后因素的相关性。结果 :PRL R阳性率与肿瘤大小、有无腋淋巴结转移、组织学分级、临床分期及增殖细胞核抗原 (PCNA)是否阳性有显著性相关 (P <0 .0 5) ;且PCNA弱阳性者较阴性者 ,淋巴结转移 1～ 3个者较无转移者PRL R阳性率均显著增高 (均P <0 0 5)血清PRL阳性率仅见与组织学级别及临床期别有显著性相关 (P <0 .0 5) ;且与PRL R在临床期别组中的阳性率比较 ,Ⅲ期患者PRL阳性率显著低于PRL R阳性率 ,乳腺癌PRL R与血清PRL阳性率间未见显著性相关 (P >0 .0 5)。结论 :PRL R或血清PRL阳性提示乳腺癌预后不良 ,PRL R估计预后较为灵敏、可靠。     

GH kinase activity in bovine anterior pituitary subcellular fractions

Growth hormone (GH) and prolactin (PRL) share significant structural homology. We have previously characterized the phosphorylation of bovine PRL and wish to determine whether a similar kinase activity phosphorylates bovine GH. Phosphorylation of bovine GH was performed using [α-³²P]ATP labeling of subcellular fractions. Bovine GH phosphorylation was dependent on Zn²⁺ or Cu²⁺ with apparent Km's of 0.9 and 1.0 mM, respectively, and a pH maxima of 7.0. The apparent Km's of bovine GH kinase activity for exogenous bovine GH and ATP were 30 μM and 376 μM, respectively. Exogenous bovine PRL served as a competitive substrate, increasing the apparent Km for bovine GH by threefold compared to the Km determined without exogenous bovine PRL. We conclude: 1) in vitro phosphorylation of bovine GH occurs under conditions that are consistent with those found in anterior pituitary cells, and 2) a similar kinase activity phosphorylates both bovine PRL and GH.     

高泌乳素患者不同时间段泌乳素水平研究

目的 探讨高泌乳素血症患者泌乳素水平在不同时间段的变化。方法 使用电化学发光法、罗氏E170全自动免疫分析仪测定124例高泌乳素(PRL>880 uIU/ml),女性患者在7:30AM,10:00AM及4:00PM不同时间段血浆泌乳素(PRL)水平,并根据经聚乙二醇(PEG)6000沉淀巨泌乳素后的PRL回收率分成巨泌乳素组(回收率≤40%)、单泌乳素组(回收率>60%)、可疑泌乳素组(40%<回收率≤60%),同时检测45例正常对照组的PRL水平。结果 高泌乳素组巨泌乳素阳性率(33.1%)与正常对照组中巨泌乳素阳性率(0.0%)比较,差异有统计学意义(χ2=17.886 7,P<0.05),巨泌乳素组及单体泌乳素组经PEG处理前在10:00AM时间段的泌乳素浓度(1160±714 uIU/ml,885±801 uIU/ml)与7:30AM时间段的泌乳素浓度(1 521±914 uIU/ml,1 497±845 uIU/ml)差异均有统计学意义(t=1.993,4.46,P<0.05),巨泌乳素组及单体泌乳素组经PEG处理后在10:00AM时间段的泌乳素浓度(316±231 uIU/ml,766±611 uIU/ml)与7:30AM时间段的泌乳素浓度(488±394 uIU/ml,1235±912 uIU/ml)差异均有统计学意义(t=2.411 4,3.625 2,P<0.05),单泌乳素组4:00PM时间段处理前的泌乳素浓度(1 033±911 uIU/ml)与7:30AM时间段处理前的泌乳素浓度(1 497±845 uIU/ml)差异也有统计学意义(t=3.168 6,P<0.05)。结论 不同时间段泌乳素水平有变化,确定正确的采血时间,有助于临床对高泌乳素血症的诊断。     

慢性血透患者血浆内皮素、心钠素、垂体泌乳素水平的变化

目的 :探讨了慢性血透患者血浆内皮素、心钠素和垂体泌乳素水平的变化。方法 :应用放射免疫分析测定了 38例慢性血透患者血浆内皮素、心钠素和垂体泌乳素水平的变化 ,并以 30名正常健康人作比较。结果 :透析前血浆内皮素、心钠素、垂体泌乳素水平非常显著地高于正常人组 (P <0 0 1) ;透析后一周 ,血内皮素水平显著下降 ,与正常人比较 ,无显著性差异 (P >0 0 5 ) ,而心钠素和垂体泌乳素与正常人组比较仍有显著差异 (P <0 0 1)。结论 :测定慢性血透患者血浆内皮素、心钠素和垂体泌乳素水平对了解病情指导临床实践具有一定的临床价值。     

BMP-4对泌乳素腺瘤细胞分泌、增殖、侵袭性影响的研究(英文)

Objective:The aim of the study was to explore the bone morphogenetic protein 4(BMP-4) how to regulate prolactin(PRL) secreting,cell proliferation and invasiveness in human prolactinoma.Methods:Ten patients who diagnosed as prolactinoma by clinical characteristics and pathology were divided into two groups,one was sensitive to Bromocriptine,the other was insensitive to Bromocriptine.Every case was conducted by primal cell culture then treated by different concentrations of BMP-4.The cell configuration was ob...