Discrimination by rhesus monkeys of diets containing supplemental amino acids.

Following an opportunity to demonstrate a preference for water with or without the addition of the amino acid isoleucine, methionine, phenylalanine, or tryptophan at a concentration proportional to that in whole egg protein, 9 monkeys were subjected on 4 occasions to a 7-day experimental week when they received an isocaloric diet containing only one-fourth the amount of protein of their normal diet. An identical low-protein diet supplemented with one of the above amino acids, again at a concentration proportional to that in egg, was presented for an equivalent period during the experimental week and the amounts consumed of each diet were compared. Ss failed to exhibit a preference or an aversion for water supplemented with any of the amino acids; however, all low-protein diets supplemented with an amino acid were consumed in greater quantities than a low-protein diet lacking a supplement. On Days 6 and 7 of the experimental weeks when protein depletion was most severe, Ss significantly (p less than .05) preferred the diet supplemented with isoleucine to a diet lacking the supplement.     

血清唾液酸测定对新生儿及幼儿期细菌性肺炎临床意义的比较分析

为了探讨血清唾液酸（SA）测定在新生儿及幼儿细菌性肺炎的意义,我们测定了72例新生儿及98例幼儿细菌性肺炎患者血清SA水平。结果显示幼儿肺炎组SA水平在1天~3天内增加到（782.1±16.5）,与幼儿非肺炎对照组（591.9±11.5）比较差异具有统计学意义（P〈0.001）。新生儿非肺炎组SA水平保持在（357.8±9.1）,明显低于幼儿对照组（P〈0.001）。而新生儿肺炎组在起病1天~3天内增加到（604.1±15.4）,明显高于新生儿非肺炎组（P〈0.001）,但与幼儿对照组没有差异。因此,血清SA水平在幼儿时期即已达到成人水平,而新生儿细菌性肺炎患者虽然SA在正常成人标准范围内,但明显高于非肺炎新生儿水平。     

Recent Biologic Studies on Suicide

This paper selectively reviews the author's recent studies on suicidal behavior in depression. Data are reviewed from a study of depressed patients who had monoamine metabolites measured in both the cerebrospinal fluid (CSF) and urine. Depressed patients who had attempted suicide had significantly reduced CSF concentrations of the dopamine metabolite homovanillic acid (HVA) and significantly lower urinary outputs of HVA than patients who had not attempted suicide. Similarly, patients who went on to reattempt suicide over a 5-year follow-up period had both significantly reduced CSF concentrations of HVA and lower urinary outputs of HVA than patients who did not reattempt. These data suggest a role for diminished central dopaminergic neurotransmission in suicidal behavior in depression. Patients who had made a violent suicide attempt also showed evidence of dysregulation of the hypothalamic-pituitary-adrenal axis.     

Diagnostic value of the cerebrospinal fluid-blood lactate quotient in mental disorders in elderly persons]

The lactate levels of cerebrospinal fluid and blood were measured enzymatically and simultaneously in 40 gero-psychiatric patients. After calculating the fluid-blood-lactate-quotients, two distinct groups emerged, whose mean quotients showed significant difference. In the first group (15 patients) with a mean quotient of 1.06, the diagnosis of cerebral arteriosclerosis was clinically confirmed in only one case. In the second group (21 patients) with a mean quotient of 1.42, however, this occurred sixteen times, which represents a proportion of 2/3. Thus, it appears that a higher quotient suggests the diagnosis of cerebral arteriosclerosis. Further examinations are though necessary.     

依那普利叶酸片与依那普利片改善动脉硬化效果比较

探讨马来酸依那普利叶酸片对冠心病患者血清同型半胱氨酸（Hcy）及脉搏波传导速度（PWV）的影响。选取108例冠心痛患者随机分为依叶组（口服马来酸依那普利叶酸片1片,每日1次）和依苏组（口服依那普利片1片,每日1次）,疗程6个月,另选取冠状动脉造影为非冠心病患者40例作对照。检测各组患者治疗前后血清Hcy水平及PWV,并进行比较。冠心病患者血清Hcy水平及PWV较非冠t心病患者明显升高（P〈o．01）,治疗6个月后,两组冠心病患者血清Hcy水平及PWV均较治疗前降低（P〈o．05,P〈o．01）,而依叶组血清Hcy水平及PWV较依苏组降低更为显著（P〈0．05,P〈0．01）。冠心病常规治疗的基础上联用叶酸可进一步降低患者血清Hcy水平及PWV,从而改善患者内皮功能及动脉硬化。     

Altered CSF 5-HIAA Disposition in Pathologic Male Gamblers

Previous reports concerning the cerebrospinal fluid (CSF) of pathologic gamblers have described disturbed norepinephrine and dopamine (but not serotonin) functioning in the central nervous system. We analyzed neurotransmitter metabolites in two consecutive 6-mL samples of CSF obtained from 10 pathologic male gamblers punctured at the L4-5 level following 8 hours of fasting along with strict bed rest. Data were compared with those for healthy male controls. In conformity with findings in healthy male controls, we found gradients in CSF 5-hydroxyindoleacetic acid (5-HIAA) and homovanillic acid (HVA), but not 4-hydroxy-3-methoxyphenyl glycol (HMPG). Expressing the CSF concentrations as nmol x L-1 x min-1 of tapping time (an estimate of the mass flow through the needle), the levels of 5-HIAA and HMPG (but not HVA) were found to be significantly lower in gamblers. Levels of 5-HIAA and HVA showed a significant correlation in gamblers but not in healthy controls. Taking tapping time into account, the CSF levels of HMPG and 5-HIAA were significantly lower in gamblers. We concluded that, in light of previous CSF findings of disturbed norepinephrine and dopamine function, altered indolamine function cannot be fully ruled out.     

Meta-Analysis of Neuropsychological Symptoms of Adolescents and Adults with PKU

Phenylketonuria (PKU; OMIM 261600) is an autosomal recessive inborn error of phenylanaline metabolism. PKU is characterized by deficient or defective phenylalanine hydroxylase activity and persistantly increased levels of the essential amino acid phenylalanine in the circulation. The present article examines current understanding of the etiology of PKU, along with a meta-analysis examining neuropsychological and intellectual presentations in continuously treated adolescents and adults. Patients with PKU differed significantly from controls on Full-Scale IQ, processing speed, attention, inhibition, and motor control. Future research utilizing an integrative approach and detailed analysis of specific cognitive domains will assist both the scientist and clinician, and ultimately the patient.     

Cortisol and dehydroepiandosterone sulfate plasma levels and their relationship to aging,cognitive function,and dementia

We have studied the relationship between dehydroepiandrosterone sulfate (DHEAS), cortisol, and cognitive function in a population of demented patients (n=29), age-matched controls (n=46), and younger subjects (n=11). All were submitted to morning collection of blood for determination of plasma cortisol and DHEAS measured by 125I radioimmunoassay. DHEAS levels and cortisol/DHEAS ratios were significantly different among groups with higher DHEAS levels and lower cortisol/DHEAS ratios in younger people (Bonferroni p<.05). Cortisol levels were associated to the presence of dementia (Odds ratio=.93; 95% CI,.86-1.01). There was no difference between DHEAS levels of demented and age-matched controls; however, demented patients showed a trend for higher cortisol/DHEAS ratios than age-matched controls and the latter showed higher ratio values than younger subjects. DHEAS and cortisol plasma values were significantly correlated in all individuals (p<.01). In this study cortisol was independently associated to the presence of dementia.     

Transthyretin influences spatial reference memory

Transthyretin (TTR) is a plasma and cerebrospinal fluid carrier for thyroxine and retinol, described also to sequester the amyloid beta peptide. TTR levels have been described as decreased in the cerebrospinal fluid of patients with Alzheimer's disease. In order to investigate the role of TTR in learning and memory, we studied young adult and old TTR-null 129/Sv mice for cognitive performance. In the absence of TTR, 5-month-old mice display spatial reference memory impairment when compared to age-matched wild-type mice. Interestingly, while aging in wild-type mice is associated with a worsening reference memory performance, TTR-null mice show no further impairment with increasing age. As a result, no significant differences were found in this spatial reference task in old mice. Our data show that the absence of TTR seems to accelerate the poorer cognitive performance normally associated with aging.     

慢性乙型肝炎T细胞功能与HBV前C区变异的研究

通过研究慢性HBV感染者前C区变异及T细胞免疫功能与疾病的相关性,评估前C（preC）区变异及T细胞免疫功能对于慢性乙型肝炎（chronichepatitisB,CHB）预后的影响。分别采用实时荧光法、突变特异PCRmsPCR法及微粒酶免疫分析法对150例HBV-DNA阳性的CHB及50例健康体检者进行血清HBV-DN...     

脑梗死不同病因亚型同血浆同型半胱氨酸浓度的关系研究

为探讨脑梗死患者血浆同型半胱氨酸（HCY）水平同病因分型及疾病严重程度的关系,选择首发脑梗死急性期患者73例,对照组30例,进行TOAST病因分型、NIHSS神经功能缺损评分、血浆HCY检测。结果显示,病例组血浆HCY升高率、水平比对照组显著增高;大动脉粥样硬化亚型病例组血浆HCY水平比对照组明显增高;病例组血浆HCY水平同NIHSS评分呈正相关,提示高HCY血症是脑梗死发病及大动脉粥样硬化亚型脑梗死发病的高危因素,血浆HCY水平同神经功能缺损程度正相关。     

术后镇痛对创伤患者围术期细胞因子和胰岛素抵抗的影响研究

研究术后镇痛对创伤患者围术期细胞因子IL 6、TNFα和胰岛素抵抗（IR）的影响.选取60例患者,随机分为两组,A组患者应用一次性术后镇痛泵,加入舒芬太尼2.5μg/kg＋盐酸托烷司琼4mg,用生理盐水稀释至100ml,2ml/h持续注入.B组患者为术后根据临床需要临时给予杜冷丁每次50mg～100mg肌肉注射,每日不超过3次.发现两组患者术后镇痛效果比较,A组患者舒适程度要优于B组,随访患者无与药物相关的不良反应.术后两组患者血浆IL-6、TNF-α水平均开始升高,术后12h左右达峰值,24h后开始回落,但均明显高于术前.血糖和血胰岛素值也在术后升高,术后24h左右达峰值,之后逐渐回落.ISI在术后开始降低,术后24h降到最低,之后逐渐回升,但均低于术前,说明IL-6、TNF-α水平升高与创伤后胰岛素抵抗有相关性.A组患者术后12h、24h、36h、48h的血糖、血胰岛素、IL-6、TNF-α水平与B组比较明显降低,而且术后48h基本可以恢复术前水平.应用舒芬太尼术后镇痛可以通过抑制血浆中IL-6和TNF-α水平,从而抑制围术期胰岛素抵抗,降低应激反应,从而达到减轻免疫抑制和降低或缩短IR时间的目的.     

Serum Lipids in Suicide Attempters

As other studies have shown possible associations of low serum cholesterol concentrations as well as serotonin and corticosteroid deviances with suicide or depression, the present study was undertaken to investigate the serum lipid levels in subgroups of suicide attempters. Serum lipids were determined in 72 suicide attempters. Cerebrospinal fluid monoamine metabolites and plasma cortisol levels were measured, and dexamethasone suppression tests were performed. Hopelessness and suicidality were rated by the Hopelessness Scale (HS) and the Suicidal Intent Scales (SIS). The mean total serum cholesterol (TSC) level was 5.0 ± 1.2 mmol/L. We found no significant correlations between TSC and the monoamine metabolites. High-density lipoprotein cholesterol showed positive correlations with the dopamine metabolite homovanillic acid (r = 0.39, p = 0.04) and the serotonin metabolite 5-hydroxyindoleacetic acid (r = 0.34, p = 0.07). The SIS and HS scales did not correlate significantly with serum lipids. “Violent” attempters showed somewhat higher serum lipid levels than “nonviolent” attempters. We found no significant differences in serum lipid levels between the diagnostic subgroups. Hence, we could not find much support for the hypothesis of associations between low cholesterol levels and decreased serotonin activity in the brain. However, this field merits further investigation.     

Plasma BDNF is reduced among middle-aged and elderly women with impaired insulin function: Evidence of a compensatory mechanism

Brain-derived neurotrophic factor (BDNF) plays a regulatory role in neuronal differentiation and synaptic plasticity and has been linked to glucose regulation and cognition. Associations among plasma BDNF, cognition, and insulin function were explored. Forty-one participants with impaired insulin function (IIF), ranging from insulin resistance to type 2 diabetes mellitus (T2DM), were matched with 41 healthy controls on gender, age, education, and IQ. Participants received complete medical, neurological, psychiatric, and neuropsychological evaluations. IIF individuals had significantly lower plasma BDNF levels than controls, particularly females, and higher BDNF levels were associated with poorer explicit memory in IIF females, suggesting that higher levels within this group may reflect the body’s efforts to respond to damage. After accounting for age, education, and HbA1c, BDNF significantly predicted 13.1–23.5% of the variance in explicit memory in IIF women. These findings suggest that BDNF elevations within diseased groups may not always be a marker of health.     

Cerebrospinal fluid concentrations of biogenic amines and corticotropin-releasing factor in adolescent non-human primates as a function of the timing of adverse early rearing

Adolescent bonnet macaques nursed as infants by mothers facing unpredictable requirements for food procurement (variable foraging demand, VFD) display persistent neurobiological disturbances. This study examined the long-term neurochemical and behavioral effects of adverse rearing initiated later in infancy than in previous cohorts of subjects to test the hypothesis that the timing of an early adverse experience would influence patterns of biobehavioral outcome. Cisternal cerebrospinal fluid (CSF) monoamine and corticotropin-releasing factor (CRF) concentrations were obtained from 20 bonnet macaques (11 VFD-reared and 9 normally reared controls) approximately 2 years after the end of differential rearing. VFD-reared primates displayed on multiple samplings significantly lower CSF CRF concentrations and higher CSF 5-hydroxyindoleacetic acid (5-HIAA) concentration compared to controls. In the VFD-reared, significant inverse correlations between CRF and all three monoamines were found (5-HIAA, 3-methoxy-4-hydroxyphenethyleneglycol and homovanillic acid), most prominently for 5-HIAA. In controls, but not VFD-reared subjects, CSF CRF was positively correlated with changes in "gregariousness" upon presentation of a fear stimulus. VFD-reared subjects displayed greater baseline hierarchical engagement than controls. In contrast to prior findings, in which rearing under VFD conditions at an earlier age led to increased CSF CRF compared with controls, CSF CRF was lower after later exposure to VFD rearing than in controls. Thus, the timing of exposure to VFD conditions early in life evidently determines whether CSF CRF was found to be elevated or decreased, within the context of increased serotonin metabolism, during the course of primate maturation.     

Effects of Cerebroventricle Administration of Acidic Fibroblast Growth Factor on Conditioned Taste Aversion Learning in Rats

Wistar strain rats were given acidic fibroblast growth factor (aFGF) or denatured aFGF into their cerebroventricle before taste aversion conditioning for saccharin solution. Animals administrated with aFGF showed significantly lower aversion threshold for saccharin at the 1st day and preference ratios for saccharin vs distilled water at the 4th, 6th, and 7th day after the conditioning than those administered with denatured aFGF. These results suggests that aFGF in the cerebrospinal fluid facilitates acquisition of the conditioned taste aversion learning.     

肥胖男性血浆脂联素水平及影响因素

检测正常男性血浆脂联素水平,探讨其与各检测指标之间的相关性。选取正常男性96例,按体重指数（BMI）将上述两组分为2个亚组：肥胖（BMI≥25kg／m^2）组40例及体重正常（BMI〈25kg／m^2）组56例,测定空腹血浆脂联素浓度。肥胖组的血浆脂联素水平[（7．48±3．4）μg／m1]明显低于体重正常组[（10．57±4．73）μg／m1],差异有显著的统计学意义（P〈0．01）。相关分析显示血浆脂联素与体重指数（BMI）、腰围（WC）、血压（BP）、总胆固醇（TC）、血清胰岛素（FINs）、胰岛素抵抗指数（HOMA-IR）之间存在负相关,与高密度脂蛋白胆固醇（HDL-C）正相关。BMI、WC、HOMA-IR为影响血浆脂联素水平的独立因素。男性肥胖者血浆脂联素水平较体重正常者明显降低,血浆脂联素水平可能与肥胖及其相关疾病相关。     

SLIPA^TM喉罩在眼外科手术中的应用

探讨SLIPA^TM喉罩用于全麻眼外科手术对患者血流动力学、呼吸功能和围术期并发症的影响。60例ASA Ⅰ或Ⅱ级在全麻下实施眼外科手术的患者,随机分为SLIPA^TM通气道组（30例）和气管内插管组（30例）。在麻醉诱导前（T0）、插入SLIPA“通气道／气管导管后即刻（T1）、插入SLIPA^TM通气道／气管导管后5...     

颞叶梗塞致学习记忆障碍的机制研究──微透析分析与超微结构观察

应用光化学的方法建立了颞叶梗塞性学习记忆障碍动物模型。海马区神经介质类氨基酸的变化用微透析技术进行活体动态观测、超微结构改变用ＴＥＭ电镜观察,并同时观察光镜下的神经细胞变化及鼠的学习记忆障碍。结果发现：（１）颞叶梗塞性痴呆鼠其海马区有大量兴奋性和抑制性氨基酸释放;（２）痴呆鼠海马区神经突触有大量囊泡聚集,晚期大小不均;（３）痴呆鼠脑新皮层及海马锥体细胞均有选择性坏死;（４）氨基酸的释放量与选择性神经细胞损伤及学习记忆障碍有关。     

家属参与授权教育对老年原发性高血压伴同型半胱氨酸血症患者管理中的应用

探讨家属参与授权教育对老年原发性高血压伴同型半胱氨酸血症患者的干预效果.选取120名老年原发性高血压伴同型半胱氨酸血症患者,随机分成试验组和对照组,每组60名,两组均采取相同的药物治疗,给予常规的授权教育模式.试验组在此基础上给予家属参与授权教育模式,为期6个月.试验组与对照组比较,总胆固醇（TC）、甘油三脂（TG）、高密度脂蛋白胆固醇（HDL-C）、低密度脂蛋白胆固醇（LDL-C）、同型半胱氨酸（Hcy）及血压值低于对照组,差异有统计学意义（P＜0.05）;试验组的生存质量及满意度评分均高于对照组,两组差异有统计学意义（P＜0.05）.经过为期6个月的健康教育干预,这一模式取得了较好的效果.