Renal excretion of endothelin in children is influenced by age and diuresis

Mattyus I, Zimmerhackl LB, Schwarz A, Hentschel M, Brandis M, Miltenyi M, Tulassay T. Renal excretion of endothelin in children is influenced by age and diuresis. Acta Pædiatr 1994;83:468–72. Stockholm. ISSN 0803–5253 Endothelin is a peptide with vasoactive and diuretic potential. Its release has been demonstrated from endothelial and renal epithelial cells. Urinary excretion of endothelin, as shown by others, is thought to reflect intrarenal production. We measured endothelin by RIA in a population of healthy children from Germany and Hungary (group 1), neonates (group 3) and children before and during forced diuresis (groups 2a and 2b). Group 1 consisted of 24 children living in Germany and 13 children resident in Hungary. The age range in this group was 2.9–17 years. Daily excretion correlated significantly with age (r= 0.48, p < 0.001), but endothelin excretion corrected for body surface area remained constant with regard to the age group studied. This indicates that body or kidney size may influence endothelin excretion, respectively. There was no difference in endothelin excretion between the two countries. In premature infants and neonates (group 3), daily excretion of endothelin was highest in infants with very low gestational ages and decreased in full-term neonates to values not significantly different to the group of older children. The high values in premature infants may have been influenced by mechanical ventilation of physical stress, which cannot be differentiated in this study, however. In contrast to reported results in adults, renal excretion of endothelin was correlated positively to urine flow in all groups. Furthermore, the influence of forced diuresis was evaluated in 10 children with oncological disease before (group 2a) and during (group 2b) forced diuresis with fluid load (3 l/m²; n= 4) and fluid load with furosemide injection (0.3–1.0 mg/kg body weight; n= 6). During this diuretic state, endothelin excretion was enhanced significantly.     

Bedwetting and behavioural and/or emotional problems

Objective: To assess the link between enuresis nocturna and the severity of behavioural and/or emotional problems in Dutch children and the course of these problems. Setting: West-Mine Region in the Netherlands. Subjects and methods: Prospective cohort study involving 66 of the 80 bedwetting children from all 1652 children born in 1983 in this region. After 1 y, contact was still possible with 64 of the enuretics. We used the Dutch version of the Child Behaviour Checklist (CBCL) and a questionnaire about bedwetting. Results: The mean T-score for Total Problems (CBCL score) in 1992 (M1; mean age 8. 6) was 52. 1, and 1 y later was 49. 2 (M2). There was no significant difference in the CBCL scores for Ml, M2 and a matching group from the Dutch CBCL norm population, either in the group who remained wet or in the group who became dry. There were no differences between the sexes. There was no link between the severity of behavioural and emotional problems and the frequency of bedwetting. However, more children with bedwetting than expected were in the clinical range. Conclusion: There was no difference in behavioural and/or emotional problems between the first and the second measurement and the matching group from the CBCL norm group. There were no differences in behavioural and/or emotional problems between primary and secondary bedwetters, nor were there any consequences related to the frequency of bedwetting.     

变性高效液相色谱法检测CpG岛胞嘧啶甲基化

目的 建立一种新型的ＣpＧ岛胞嘧啶甲基化快速检测方法。方法 用亚硫酸氢钠处理ＤＮＡ,丙用链特异性聚合酶链反应（ＰＣＲ）对错配修复基因hＭＬＨ１启动子含ＣpＧ位点的靶序列进行扩增;利用变性高效液相色谱法（ＤＨＰＬＣ）在部分变性温度下测定靶序列的保留时间,并与亚硫酸氢钠－酶切法测定结果进行比较。结果 用ＤＨＰＬＣ对结肠癌细胞株ＲＫＯ和胃癌细胞株ＰＡＣＭ８２的hＭＬＨ１启动子进行测定,发现ＲＫＯ细胞ＰＣＲ产物的保留时间显长于ＰＡＣＭ８２细胞ＰＣＲ产物的保留时间（６．７min比６．２min）。ＲＫＯ细胞ＰＣＲ产物保留时间的延长是亚硫酸氢钠处理后的模板中胞嘧啶和鸟嘌呤含量较ＰＡＣＭ８２高所致。从此结果分析,可以判断出ＲＫＯ的hＭＬＨ１启动子已甲基化,而ＰＡＣＭ８２细胞未甲基化。此结果与酶切法结果完全一致。结论 新方法可以快速检测ＣpＧ岛胞嘧啶甲基化。     

Blue toe syndrome: treatment with percutaneous atherectomy

"Blue toe syndrome" refers to digital ischemia of the foot in the presence of palpable or Doppler audible pedal pulses. This clinical syndrome is caused by microembolization to small vessels from a proximal source. The use of percutaneous transluminal atherectomy is described in the treatment of embologenic superficial femoral artery lesions in seven patients. All seven had prompt healing of the ischemic toes, and none required surgical revascularization or amputation. One patient developed a recurrent stenosis at the atherectomy site and had a second episode of digital ischemia, which was treated by means of atherectomy with a larger device. Histologic study of atherectomy specimens suggests that emboli arise from adherent fibrinoplatelet aggregates or thrombus and less often from cholesterol-rich atheromatous plaque. Although either percutaneous transluminal angioplasty or atherectomy can be used to treat the underlying stenosis, percutaneous atherectomy offers the advantage of nonsurgical removal of embologenic material and provides material for histologic study. Percutaneous atherectomy is an effective method of treating embologenic superficial femoral stenoses in patients with ipsilateral blue toe syndrome.     

卵清白蛋白特异性T细胞免疫诱导BALB/c小鼠的调节性免疫应答

目的：研究T细胞免疫后正常小鼠的调节性免疫应答，方法：应用体外扩增的卵清白蛋白（OVA）特异的T细胞克隆免疫BALB／c小鼠，3H－TdR掺入法分析细胞增殖，3H－TdR标记靶细胞检测杀伤T细胞的杀伤效应，间接免疫荧光法分析血清中抗T细胞抗体水平。结果：T细胞免疫后能诱导BALB/c小鼠产生调节性T细胞的增殖反应，对靶细胞的杀伤效应以及针对于活化的T细胞的体液免疫应答，并进一步降低机体对OVA抗原的应答，结论：T细胞免疫能诱导正常机体的调节性免疫应答。