老年男性骨质疏松患者血清瘦素、胰岛素样生长因子-1和胰岛素样生长因子结合蛋白-3表达的临床意义

目的观察骨质疏松(OP)老年男性患者血清中瘦素、胰岛素样生长因子(IGF)-1和IGF结合蛋白(IGFBP)-3的表达特征,关注其临床意义。方法 68例OP老年男性患者作为观察组,38例正常骨密度、无明显器质性疾病的老年男性作为对照组。抽取两组的空腹静脉血,检测血清中瘦素、IGF-1和IGFBP-3的表达。结果观察组中瘦素、IGF-1和IGFBP-3的表达明显低于对照组,观察组中伴有骨折患者血清中瘦素、IGF-1和IGFBP-3的表达明显低于不伴有骨折患者,相关分析显示瘦素和IGF-1、IGF-1和IGFBP-3的表达均呈正相关性。结论 OP老年男性患者血清中瘦素、IGF-1和IGFBP-3低表达,瘦素和IGF-1、IGF-1和IGFBP-3均具有协同作用,三种细胞因子均参与病变形成及进展。     

非霍奇金淋巴瘤患者血清胰岛素样生长因子-1及其结合蛋白-3表达水平的初步观察

目的:探讨非霍奇金淋巴瘤(NHL)患者血清胰岛素样生长因子-1(IGF-1)及其结合蛋白-3(IGFBP-3)表达水平及其临床意义.方法:选择28例诊断初发NHL患者(淋巴瘤组)及28例健康志愿者(对照组),化学发光法测定血清IGF-1及IGFBP-3水平并计算IGF- 1/IGFBP-3值,分析组间的差异.结果:血清IGF-1及IGFBP-3水平淋巴瘤组显著低于正常对照组(均P＜0.01);IGF-1/IGFBP-3淋巴瘤组与正常对照组差异无统计学意义(P＞0.05);不同亚型的淋巴瘤组的血清IGF-1、IGFBP-3水平及IGF-1/IGFBP-3比值的差异均未达到统计学意义(P＞0.05).结论:N HL患者血清IGF-I及IGFBP-3水平明显降低,可能与NHL相关.IGF-1/IGFBP-3比值与NHL无明显相关性,IGF-1及IGFBP-3水平与NHL的分型无明显相关.     

肥胖患者血清游离胰岛素样生长因子Ⅰ及其结合蛋白水平与代谢因素的关系

目的 观察肥胖患者血清游离胰岛素样生长因子Ⅰ(IGF-Ⅰ)、胰岛素样生长因子结合蛋白1(IGFBP-1)及IGFBP-3水平,分析其与年龄、性别、体重指数(BMI)、糖代谢、脂代谢等指标的关系。方法应用ELSA法测定97例肥胖患者和84例正常人血清游离IGF-Ⅰ、IGFBP-3、IGFBP-1、真胰岛素和血脂水平。结果 肥胖组与对照组比较,IGFBP-3明显增高(P<0.01),IGFBP-1下降(P<0.05),而游离的IGF-Ⅰ水平差异无显著性。游离IGF-Ⅰ水平与年龄呈显著负相关(正常组r=-0.26,P<0.05;肥胖组r=-0.42,P<0.01)。在肥胖组,游离IGF-Ⅰ水平与空腹血糖(r=-0.31,P<0.01)、低密度脂蛋白(r=-0.23,P<0.05)及IGFBP-1(r=-0.24,P<0.05)呈负相关,IGFBP-1与BMI(r=-0.41,P<0.01)、空腹胰岛素(FINS)(r=-0.35,P<0.01)和Homa-IR指数呈负相关(r=-0.31,P<0.01),IGFBP-3与FINS呈正相关(r=0.26,P<0.05)。结论 游离IGF-Ⅰ水平随年龄的增长有下降的趋势,并可能参与糖代谢及脂代谢的调节。IGFBP-1浓度可能反映胰岛素抵抗状态。     

肺癌患者胰岛素样生长因子1和胰岛素样生长因子结合蛋白3的表达及其临床意义

目的 分析肺癌患者血清和支气管肺泡灌洗液（BALF）中胰岛素样生长因子1（IGF-1）、胰岛素样生长因子结合蛋白3（IGFBP-3）的表达,探讨其在肺癌诊断和预后中的临床意义.方法 运用免疫放射法检测80例非小细胞肺癌患者和14名健康者（对照组）外周血血清与BALF中IGF-1、IGFBP-3的水平.结果 肺癌组血清和BALF中IGF-1表达显著高于对照组（P＜0.01）,IGFBP-3的表达显著低于对照组（P＜0.05）,同时IGF-1/IGFBP-3升高（P＜0.01）.IGF-1、IGF-1/IGFBP-3在有淋巴结转移、远处转移和TNMⅢ～Ⅳ的肺癌患者血清、BALF中明显高于无转移者和TNMⅠ～Ⅱ期者（P＜0.05）,而IGFBP3下降明显高于无转移者及TNMⅠ～Ⅱ期者（P＜0.05）.肺癌组血清IGF-1、IGFBP-3浓度与BALF中的浓度呈正相关（P ＜0.01）;患者血清BALF中IGF-1与IGFBP-3浓度呈负相关（P＜0.05）.结论 非小细胞肺癌患者血清和支气管肺泡灌洗液中IGF-1、IGFBP-3的表达对肺癌的诊断、判断预后有重要临床意义.     

肝硬化失代偿患者血清胰岛素样生长因子结合蛋白-3测定的临床意义

我们应用放射免疫法检测肝硬化失代偿患者血清胰岛素样生长因子(IGF)-Ⅰ、IGF-Ⅱ、胰岛素样生长因子结合蛋白(IGFBP)-3水平,以初步探讨肝硬化失代偿患者血清IGFBP-3含量测定的临床意义.     

老年肺部感染患者生长激素-胰岛素样生长因子轴的变化与蛋白代谢关系

目的　研究老年肺部感染患者生长激素胰岛素样生长因子轴(GH -IGF轴)的变化及其与蛋白代谢的关系。方法　检测2002-07~2003-01首都医科大学宣武医院老年科和急诊科的20例老年肺部感染患者的血清生长激素(GH)、胰岛素样生长因子Ⅰ(IGF -Ⅰ)、胰岛素样生长因子结合蛋白1 (IGFBP -1 )、胰岛素样生长因子结合蛋白3 (IGFBP -3)、总蛋白、白蛋白、前白蛋白、转铁蛋白的质量浓度,并与老年正常对照组相比。结果　(1)肺部感染患者的血清IGF- Ⅰ质量浓度显著低于正常对照组(P<0 .05),而血清GH、IGFBP- 1质量浓度显著高于对照组(P<0 .05); (2)肺部感染患者的血清总蛋白、白蛋白、前白蛋白、转铁蛋白的质量浓度显著低于正常对照组(P<0. 01); (3)血清GH、IGF -Ⅰ、IGFBP- 1、IGFBP -3与血清白蛋白、前白蛋白、转铁蛋白之间呈相关关系。结论　老年肺部感染患者存在着GH -IGF轴的变化,此变化与蛋白代谢相关。     

过敏性紫癜患儿血清胰岛素样生长因子及胰岛素样生长因子结合蛋白-3的变化

目的 探讨胰岛素样生长因子(IGF)-1及胰岛素样生长因子结合蛋白(IGFBP)-3在过敏性紫癜(HSP)中的作用.方法 采用放射免疫法方法测定45例HSP患儿不同时期的血清IGF-1及IGFBP-3、C反应蛋白(CRP)水平.采用t检验和直线相关关系.结果 HSP急性发作组血清IGF-1[(452±183)μg/L]、IGFBP-3[(13 897±3124)μg/L]及CRP[(20±8)mg/L]水平升高,与健康对照组和缓解组比较,差异均有统计学意义(t值分别为3.42、4.10、11.17、11.63、8.59、9.86.P均<0.01);HSP缓解组血清IGF-1、IGFBP-3及CRP与健康对照组比较,差异无统计学意义(t=0.3,4、0.34、0.52,P均>0.05).HSP急性期并发肾损害组血清IGF-1[(621±253)μg/L]、IGFBP-3[(18 763±3173)μg/L]水平升高,与无肾损害组比较,差异有统计学意义(t值分别为4.21、7.26,P均<0.01),有胃肠道症组血清IGF-1[(479±192)μg/L]、IGFBP-3[(13 986±3162)μg/L]水平与无胃肠道症状组比较,差异无统计学意义(t值分别为0.83、0.16,P均>0.05);血清CRP水平在肾损害组与非肾损害组及胃肠道症组与无胃肠道症状组问差异均无统计学意义(t值分别为0.56、0.32.P均>0.05).HSP急性期患儿血IGF-1、IGFBP-3与CRP浓度之间呈直线正相关(r值分别为0.624,0.672,JP均<0.01).结论 IGF-1、IGFBP-3参与了HSP疾病的病理生理过程,血清IGF-1、IGFBP-3测定对紫癜性肾损害的诊断、病情监测及预后判断有一定帮助.

Abstract：

Objecfive To investigate the role of serum Insulin-like growth factor(IGF)-1,insulinlike growth factor-binding potein(IGFBP)-3 in children with Henoch-Schonlein purpura(HSP).Methods The serum concentration of IGF-1,1GFBP-3 was measured by enzyme-linked immunosorbent assay(ELISA)method in 45 acute SHP patients,40 recoverv patients and 30 healthy controls.Results The serum levels of IGF-1 [(452±183)μg/L],IGFBP-3 [(13 897±3124)μg/L] and C-reactive protein(CRP)[(20±8)mg/L]in acute phase were significantly higher than those in healthy controls(P<0.0 1)and higher than those during recovery period.The serum level of IGF-1,IGFBP-3 for the HSP patients dropped back slowly and their levels during recovery period were the same as those in healthy controls(P>0.05).The serum levels of IGF-1[(621±253)μg/L] and IGFBP-3[(18 763±3173)μg/L] were higher in the renal damage group than in the non-renal damage group(P<0.01).and the same in patients with gastrointestinal symptoms group as in patients without gastrointestinal symptoms group(P>0.05).whereas the serum level of CRP was not significantly different(P>0.05).The serum levels of IGF-1,IGFBP-3 showed positive correlation with the level of CRP(r=0.624,0.672,P<0.01).Conclusion The IGF-1 and IGFBP-3 may play an important role in the pathological mechanism of HSP.The level of IGF-1 may be used as an indicator for HSP disease activity and progression.IGF-1 mav have a close relation with the damage"of renaJ system in HSP.     

急性脑梗死患者血清胰岛素样生长因子1和胰岛素样生长因子结合蛋白3水平的变化

为探讨急性脑梗死患者血清胰岛素样生长因子 1和胰岛素样生长因子结合蛋白 3水平的动态变化及其临床意义 ,采用酶联免疫吸附试验双抗体夹心法检测 6 0例急性脑梗死患者 (发病后第 3天及第 14天 )和 30例正常人血清胰岛素样生长因子 1和胰岛素样生长因子结合蛋白 3水平 ,并根据影像学结果所显示的梗死灶的直径将所有患者分为大梗死组、中梗死组和小梗死组 ,分析梗死灶大小对血清胰岛素样生长因子 1和胰岛素样生长因子结合蛋白 3水平的影响。结果发现脑梗死组发病后第 3天和第 14天血清胰岛素样生长因子 1和胰岛素样生长因子结合蛋白 3水平均显著低于正常对照组 (P <0 .0 0 1) ,脑梗死组发病后第 3天血清胰岛素样生长因子 1和胰岛素样生长因子结合蛋白 3水平显著低于第 14天 (P <0 .0 0 5 ) ;不同大小梗死灶组之间 (发病后第 3天和 14天 )血清胰岛素样生长因子 1和胰岛素样生长因子结合蛋白 3水平差异显著 (P <0 .0 0 1)。以上提示胰岛素样生长因子 1可能对脑缺血区的神经元具有保护作用 ,而且血清胰岛素样生长因子 1和胰岛素样生长因子结合蛋白 3水平受梗死灶大小的影响     

Graves病患者胰岛素抵抗与IGFBP-1及GH关系的研究

目的 探讨Graves病(GD)甲亢患者糖代谢紊乱的可能机制.方法测定GD患者糖耐量、胰岛素以及空腹时血清胰岛素样生长因子结合蛋白-1(IGFBP-1),游离胰岛素样生长因子-1(IGF-1),生长激素(GH)、胰升糖素水平.结果 GD患者有62.2%存在糖代谢异常,表现为高血糖和高胰岛素血症,IGFBP-1、GH、胰升糖素显著高于正常对照组,游离IGF-1显著低于正常对照组,IGFBP-1与FT3、FT4呈显著正相关(r=0.69,P＜0.01;r=0.81,P＜0.01).餐后2 h血糖与IGFBP-1呈显著正相关(r=0.47,P＜0.05).游离IGF-1与GH呈显著负相关(r=-0.61,P＜0.01).结论 GD患者存在胰岛素抵抗(IR),甲状腺激素对IGFBP-1有直接的刺激作用.IGFBP-1、GH及胰升糖素升高和游离IGF-1水平下降等共同参与了IR形成.     

先天性心脏病手术后生长激素-胰岛素样生长因子轴的变化

目的 探讨先天性心脏病患儿手术后生长激素(growth hormone)和胰岛素样生长因子(insulin-like growth factor,IGF)轴的变化及意义.方法 先天性心脏病25例,采用放射免疫测定法测定治疗前、手术治疗后3个月、6个月和1年空腹血IGF-1及胰岛素样生长因子结合蛋白-3(insulinlike growth factor binding protein-3,IGFBP-3);对照组为正常儿童20名.结果 先天性心脏病患儿手术前血IGF-1和IGFBP-3浓度较正常儿童减低(P＜0.01);先天性心脏病手术治疗后患儿的IGF-1和IGFBP-3浓度随着术后时间增加而逐渐提高,至1年时与同龄儿童持平,差异无统计学意义(P＞0.05).结论 先天性心脏病患儿存在生长发育迟缓及生长激素-胰岛素样生长因子轴功能的紊乱能通过手术治疗纠正,从而改善先天性心脏病患儿生长发育.     

Possible roles of insulin,IGF-1 and IGFBPs in initiation and progression of colorectal cancer

AIM: To investigate the roles of serum insulin, insulinlike growth factor-1(IGF-1), and insulin-like growth factor binding proteins(IGFBPs) in the initiation and progression of colorectal cancer. METHODS: We determined serum insulin, IGF-1 and IGFBPs levels in 615 colorectal cancer patients and 650 control healthy donors by enzyme-linked immunosorbent assay(ELISA). In the meantime, their body mass index(BMI) and waist-to-hip ratio(WHR) were measured. RESULTS: Serum levels of insulin and IGF-1 as well as IGF-1/IGFBP-3 ratio in pre-operation patients were significantly elevated, but the level of IGFBP-3 was significantly decreased compared with normal controls and post-operation patients(P < 0.05 and P < 0.001,respectively). There is no significant difference(P > 0.05) in the levels of insulin, IGF-1, IGFBP-1, IGFBP-3 and IGF-1/IGFBP-3 between the patients with and without hepatic as well as distal abdominal metastases. WHR and BMI of colon cancer patients were positively and significantly correlated with the levels of insulin and IGF-1/IGFBP-3. In contrast, WHR and BMI were negatively correlated with IGFBP-3 level. CONCLUSION: The elevation of insulin, IGF-1 as well as IGF-1/IGFBP-3 ratio and the reduction of IGFBP-3 may be related to the initiation of colorectal cancer, but they are not related to the progression and outcome of the disease.     

慢性心力衰竭患者血清胰岛素样生长因子-1及其结合蛋白的变化及意义

目的 通过对慢性心力衰竭患者血清中胰岛素样生长因子（insulin-like growth factor,IGF）-1及其相关结合蛋白的浓度测定,研究IGF-1及其相关结合蛋白对慢性心力衰竭的影响.方法 选取2012年6月至2013年12月江西省人民医院心内科慢性心力衰竭患者184例,按纽约心脏病协会心功能分级分为3组（心功能Ⅱ级组、Ⅲ级组和Ⅳ级组）,并选取正常人群63例作为对照组,测定其血清总IGF-1,游离IGF-1（Free IGF-1）、IGF结合蛋白（insulin-like growth factor-binding protein,IGFBP）-1,IGFBP-3浓度.对各组数据进行统计学分析,比较各组之间的血清总IGF-1,Free IGF-1、IGFBP-1,IGFBP-3浓度差异.结果 心功能Ⅳ级组血清总IGF-1,FreeIGF-1,IGFBP-3浓度明显高于心功能Ⅲ级组,心功能Ⅲ级组血清总IGF-1,Free IGF-1,IGFBP-3浓度明显高于心功能Ⅱ级组,差异有统计学意义（P＜0.01）.结论 血清IGF-1浓度随着慢性心力衰竭患者心功能变差而升高,说明IGF-1对患者心功能的恢复可能有明显的促进作用.     

Insulin-like growth factor-1 is a predictor of blood haemoglobin concentration in 70-yr-old subjects

The role of growth hormone (GH) for maintaining normal erythropoiesis among non-GH-deficient elderly subjects is not known. OBJECTIVES: To determine relationships between the concentrations of serum insulin-like growth factor-1 (IGF-1) and it's carrier protein insulin-like growth factor binding protein 3 (IGFBP-3), as well as plasma erythropoietin (EPO), and blood haemoglobin (Hb) in elderly subjects. METHODS: Serum IGF-1 and IGFBP-3 and plasma EPO were, in addition to basal haematological tests, measured in a community based representative population sample of 70-yr-olds (n = 619; 317 women and 302 men). Statistical analyses were made before and after exclusion of non-healthy subjects. RESULTS: Mean IGF-1 concentration was higher among men than women (155 vs. 138 mug/L, P = 0.0000), and that of IGFBP3 lower (2.21 vs. 2.65 mg/L, P = 0.0000). Exclusion of subjects with demonstrable disorders did not significantly influence the distributions of serum-IGF-1 and serum-BP-3. Hb concentration was positively correlated to concentrations of IGF-1 (r = 0.15, P < 0.01 for the men; r = 0.34, P < 0.001 for the women), and IGFBP-3 (r = 0.07, n.s. for the men; r = 0.27, P < 0.001 for the women), and negatively correlated to EPO concentration (r = -0.34, P < 0.001 for the men; r = -0.42, P < 0.001 for the women). In multivariate analysis, serum concentrations of IGF-1, iron, and plasma concentrations of EPO were independently correlated to Hb among both men and women. CONCLUSION: GH and/or IGF-1 are, independently from EPO and regardless of health status and sex, a significant determinant of Hb in elderly subjects.     

血清IGF-1, IGFBP-3, PSA及fPSA在前列腺癌诊断中的意义

目的探讨胰岛素样生长因子-1（IGF-1）和胰岛素样生长因子结合蛋白-3（IGFBP-3）在前列腺癌（PCa）患者血清中的水平及其与前列腺特异抗原（PSA）、游离PSA（fPSA）联合检测的意义。方法采用化学发光法（CLIA）检测52例PCa患者、48例良性前列腺增生症（BPH）患者和48例健康对照者的血清IGF-1,IGFBP-3,PSA及fPSA水平。结果 PCa组IGF-1水平较BPH组、健康对照组明显升高（P＜0.01）,BPH组与健康对照组比较,差异无统计学意义（P＞0.05）;PCa组IGFBP-3水平低于BPH组和健康对照组（P＜0.01）,BPH组与健康对照组比较,差异有统计学意义（P＜0.01）。IGF-1及IGFBP-3诊断PCa的灵敏度分别为83.6%和76.4%,特异度分别为84.0%和74.0%,阳性预测值分别为85.2%和76.4%,阴性预测值分别为82.4%和74.0%。血清IGF-1与PSA或fPSA联合检测可明显提高诊断PCa的灵敏度。结论 PCa患者的IGF-1及IGFBP-3水平较健康对照者发生改变,IGF-1与PSA或fPSA联合检测更有助于PCa的诊断。     

Evaluation of serum insulin-like growth factor 1 and its significance in thyroid cancer: An observational study

Serum insulin-like growth factor 1 (IGF-1) is elevated in different cancers. However, relationships between serum IGF-1 and thyroid cancer (TC) are scarce. The present study aimed to investigate the clinical significance of serum IGF-1 in TC.Serum was collected from 124 TC patients, 50 patients with benign nodules, and 50 healthy controls. Serum IGF-1 levels were measured and compared. Relationships were investigated between IGF-1 and clinical characteristics. A receiver operating characteristic (ROC) curve was plotted to explore the diagnostic value of IGF-1 in TC.Serum IGF-1 levels were significantly higher in TC than that of healthy controls and benign nodules (P = .003; P < .001). Serum IGF-1 levels were higher in TC patients with advanced stage than early stage (P = .029). Higher serum IGF-1 levels were found in patients with lymph node metastasis present and (tumor size >1 cm) than that of patients without lymph node metastasis (P = .018) and (tumor size ≤1 cm) (P = .031). Serum IGF-1 levels were higher in patients with a solitary nodule than multinodular nodules (P = .043). The serum IGF-1 cutoff value for a TC diagnosis was 216 ng/mL with a sensitivity of 53.2%, a specificity of 74.0%, a positive predictive value (PPV) of 83.5%, and an area under the curve was of 0.71.Serum IGF-1 was significantly correlated with tumor stage, size, and lymph node metastasis. Serum IGF-1 shows great potential as a laboratory marker for TC.     

Relationship between serum insulin-like growth factor-1 levels and Alzheimer's disease and vascular dementia

OBJECTIVES: To determine whether decreased serum insulin-like growth factor-1 (IGF-1) levels could be a risk factor for dementia in older people. DESIGN: Case control study. SETTING: Showa University Karasuyama Hospital, Tokyo, Japan. PARTICIPANTS: A total of 436 Japanese elderly subjects: 106 patients with Alzheimer's disease (AD), 103 patients with vascular dementia (VaD), and 227 age-matched controls without dementia. MEASUREMENTS: Serum concentrations of IGF-1 and atherogenic lipoproteins, carotid artery intima-media thickness (IMT), and plaques were determined. RESULTS: Mini-Mental State Examination (MMSE) scores were positively correlated with serum IGF-1 concentrations as well as mean blood pressure or body mass index and were negatively correlated with age, serum low-density lipoprotein cholesterol and lipoprotein(a) concentrations, and carotid IMT. Serum IGF-1 concentrations had a significant inverse correlation with carotid IMT. Analysis across the IGF-1 quartiles revealed a threshold effect of low IGF-1 on MMSE score in subjects with the IGF-1 levels of 140 ng/mL or less (50% percentile) versus those with IGF-1 levels greater than 140 ng/mL. Multiple logistic regression concerning AD and VaD retained serum IGF-1 concentrations of 140 ng/mL or less and carotid IMT of 0.9 mm or more. Patients with AD and VaD had significantly lower IGF-1 concentrations and greater mean IMT than nondemented controls. CONCLUSION: These results suggest that decreased serum IGF-1 level and the progression of carotid atherosclerosis could play a role as independent risk factors for dementia.     

Increased levels of insulin-like growth factor binding protein-3 in hypertensive patientswith carotid atherosclerosis

BackgroundIt has been proven that the intima–media thickness (IMT) of the carotid artery increases in patients with essential hypertension. Serum levels of insulin-like growth factor-1 (IGF-1) increase in hypertensive patients with ventricular hypertrophy. However, the relationship between carotid atherosclerosis and serum levels of IGF-1 and its binding protein-3 (IGFBP-3) in patients with essential hypertension has not been established.MethodsThe carotid IMT, blood pressure (BP), serum lipid profiles, and serum IGF-1 and IGFBP-3 contents were determined in 54 hypertensive patients (19 with and 35 without carotid plaque) and 52 normotensive controls without plaque.ResultsSystolic, diastolic, and mean BPs and serum IGFBP-3 level were significantly higher in the hypertensive patients (with and without plaque) than in the normotensive controls. The IGFBP-3 level correlated with systolic BP (r = 0.204, P = .0354). Age, gender, body mass index, and serum levels of HDL cholesterol, triglycerides, lipoprotein(a), lipid peroxides, insulin, and fasting plasma glucose did not differ significantly among the three groups. Hypertensive patients with plaque, compared with those without plaque or the normotensive controls, had the highest values of carotid IMT, LDL cholesterol, IGF-1, and IGFBP-3. Multiple logistic regression analysis revealed that the IGFBP-3 level was associated with a ninefold (95% confidence interval 2.6–31) higher risk of carotid plaque formation compared with LDL cholesterol or IGF-1 levels.ConclusionsThese results suggest that an increased level of IGFBP-3 may play a crucial role in the development of carotid atherosclerosis in hypertensive patients.     

Serum insulin-like growth factor type 1, insulin-like growth factor-binding protein-1, and insulin-like growth factor-binding protein-3 concentrations in patients with thyroid dysfunction.

Thyroid hormones play a role in the regulation of insulin-like growth factor type 1 (IGF-1) and insulin-like growth factor-binding protein-3 (IGFBP-3) expression, and both IGF-1 and IGFBPs have been shown to be related to the function and growth of the thyroid. Our aim was to evaluate serum concentrations of IGF-1, IGFBP-1, and IGFBP-3 in patients with thyroid dysfunction before and after normalization of thyroid function. The study was performed in 86 patients with thyroid dysfunction (43 hyperthyroid and 43 hypothyroid patients) and 17 euthyroid subjects. Serum growth hormone (GH), insulin, IGF-1, IGFBP-1, and IGFBP-3 were measured in all patients before and after normalizing serum thyroid hormone concentrations. Hyperthyroid patients showed IGF-1 (198.8 +/- 17.0 microg/L) and IGFBP-3 levels (4.2 +/- 0.2 mg/L) similar to those found in the control group (217.9 +/- 20.3 microg/L and 4.2 +/- 0.3 mg/L, respectively). After therapy these levels significantly decreased to 156.6 + 11.1 microg/L (p < 0.01) and 3.3 +/- 0.1 mg/L (p < 0.001), respectively. IGFBP-1 concentrations were clearly higher than those found in controls (22.7+/- 2.6 vs. 5.7 +/- 1.5 microg/L, p < 0.001) and exhibited a significant reduction after therapy for thyroid hyperfunction (11.0 +/- 1.7 microg/L, p < 0.001). Patients with hypothyroidism showed serum concentrations of IGF-1 (161.5 +/- 13.1 microg/L, p < 0.05) and IGFBP-3 (3.2 +/- 0.3 microg/L, p < 0.05) significantly lower than those found in healthy volunteers. However, replacement therapy with levothyroxine did not induce any significant modification of these concentrations (152.6 +/- 10.6 microg/L and 3.2 +/- 0.2 mg/L, respectively). Similarly, patients with thyroid hypofunction exhibited raised levels of IGFBP-1 (15.5 +/- 0.9 microg/L, p < 0.05 vs. control group) that were significantly decreased after therapy (8.8 +/- 1.4 microg/L, p < 0.01). The results of the present study show that thyroid status affects GH/IGF axis. Hypothyroidism is associated with significant reductions of IGF-1 and IGFBP-3, and IGFBP-1 is elevated in both hypothyroidism and hyperthyroidism.     

Serum levels of free insulin-like growth factor (IGF)-I and IGF-binding protein-1 in prepubertal children with idiopathic short stature

The study was performed to evaluate the relationships among serum free and total insulin-like growth factor (IGF)-I, IGF-binding protein-1 (IGFBP-1), IGFBP-3, and insulin concentrations in prepubertal children with idiopathic short stature (ISS). Eighteen children with ISS and 15 age-matched controls were included in the study. All short children had a height standard deviation score of more than 2 below the mean, and maximum stimulated GH levels greater than 10 microg/l after two standard provocation tests. The serum levels of free IGF-I were significantly lower in short children (1.6 +/- 0.3 microg/l) than in the controls (2.8 +/- 0.6 microg/l, P<0.05), while total IGF-I levels were slightly, but not significantly, lower in short children than in controls. The serum levels of IGFBP-1 were significantly higher in the ISS group (124.6 +/- 5.6 microg/l) than in controls (80.0 +/- 8.7 microg/l, P < 0.0001). The fasting insulin and IGFBP-3 levels were similar in both groups. A stepwise regression analysis for all subjects revealed that IGFBP-1 is the only independent predictor of log free IGF-I (R2 = 0.23, P<0.01). The present study shows that the serum levels of free IGF-1 are significantly lower and insulin-like growth factor-binding protein-1 levels are higher in prepubertal children with idiopathic short stature, as compared with age-matched controls. The high IGFBP-1 may contribute to growth retardation in a subgroup of idiopathic short stature through a decrease in free IGF-1.