Opposing effects of D1 and D2 receptor activation on odor discrimination learning

Dopaminergic modulation of cortical activity has been implicated in the formation of reward associations. There is abundant evidence for dopaminergic effects on olfactory processing. Using an olfactory discrimination task, the authors show that D1 and D2 dopamine receptors can regulate rats' olfactory discrimination capacities and that the effects of receptor activation functionally oppose one another. Injection of either the D1 agonist SKF 38393 (10 mg/kg) or the D2 antagonist spiperone (0.62 mg/kg) facilitated the discrimination of similar odorants but had no effect on the discrimination of dissimilar odorants, whereas both the D, antagonist SCH 23390 (0.025 mg/kg) and the D2 agonist quinpirole (0.2 mg/kg) significantly impaired rats' ability to discriminate similar and dissimilar odorants.     

MTT比色法检测IL—2和杀伤细胞活性的研究

本文采用ＭＴＴ比色法测定了ＬＡＫ和ＴＩＬ细胞培养上清ＩＬ－２活性及ＬＡＫ细胞介导对体外培养的白血病细胞株的杀伤活性。结果表明ＬＡＫ细胞和ＴＩＬ细胞培养上清有较高的ＩＬ－２活性，可用于支持培养ＩＬ－２依赖株的生长；ＬＡＫ细胞对体外培养的白血病细胞株有明显的杀伤作用。其杀伤效应随效靶比例增加而增高；同时亦证明：活的白血病细胞数与ＭＴＴ甲赞形成产物呈直线相关性，提示通过ＭＴＴ法测定ＯＤ值能较好地反映活细     

结节性血管炎患者丝裂原刺激的淋巴细胞转化

以＾３ＨＴｄＲ掺入法和ＭｃＡｂ间接免疫荧光法检测结节性血管炎患者细胞免疫功能,为探索结节性血管炎的免疫学发病机理提供实验依据。结果表明：与健康对照组比较,结节性血管炎患者外周血、细胞数明显降低（Ｐ〈０．０１）,细胞百分率无明显变化（Ｐ〉０．０５）,而Ｂ＾＋细胞数增高（Ｐ〈０．０１）;ＰＨＡ、ＣｏｎＡ、ＰＷＭ丝裂原刺激的淋巴细胞转化能力均低下（Ｐ〈０．０１或Ｐ〈０．０５）。提示结节性血管炎存在免疫功     

益肾活血泄浊汤对大鼠系膜细胞转化生长因子β1表达的影响

探讨益肾活血泄浊汤及脂多糖 (LPS)对大鼠系膜细胞转化生长因子 β(TGF β)mRNA表达的影响。采用体外培养大鼠系膜细胞方法 ,分为益肾活血泄浊汤血清组、LPS病理组及空白组 ,并应用反转录多聚酶链反应技术 (RT PCR) ,观察TGF β1mRNA在各组间的表达情况。结果 :与空白组相比 ,LPS可显著刺激TGF β1的表达 ,而中药血清组较LPS组明显减弱。结论 :益肾活血泄浊汤能够显著降低转化生长因子 β1在系膜细胞中的表达。     

Induction of apoptosis by N-(4-hydroxyphenyl)retinamide and its association with reactive oxygen species, nuclear retinoic acid receptors, and apoptosis-related genes in human prostate carcinoma cells

The synthetic retinoid N-(4-hydroxyphenyl)retinamide (4HPR) has been shown to induce apoptosis in various malignant cells including human prostate carcinoma cells (HPC). We examined several possible mechanisms by which 4HPR could induce apoptosis in HPC cells. 4HPR exhibited concentration- and time-dependent decrease in cell number both in androgen-dependent (LNCaP) and -independent (DU145 and PC-3) cells. The 4HPR concentrations causing 50% decrease in cell number in LNCaP, DU145, and PC-3 cultures were 0.9 +/- 0.16, 4.4 +/- 0.45, and 3.0 +/- 1.0 microM, respectively, indicating that LNCaP cells were more sensitive to 4HPR than the other cells. 4HPR-induced apoptosis in all three cell lines was evidenced by increased enzymatic labeling of DNA breaks and formation of a DNA ladder. 4HPR increased the level of reactive oxygen species, especially in LNCaP cells. 4HPR-induced apoptosis could be suppressed in LNCaP cells by antioxidant and in DU145 cells by a nuclear retinoic acid receptor-specific antagonist, suggesting the involvement of reactive oxygen species or retinoic acid receptors in mediating apoptosis induced by 4HPR in the different HPC cells. Furthermore, 4HPR modulated the expression levels of some apoptosis-related gene (p21, c-myc, and c-jun), which may also contribute to the induction of apoptosis by 4HPR in HPC cells.     

针推药治疗肩周炎636例

肩周炎即肩关节周围炎,多发于50岁左右之妇女,故又称五十肩,中医称为肩凝症、肩漏风、冻结肩等。其临床表现主要为肩周疼痛和功能活动障碍。治疗方法繁多,疗效不一,笔者自1997年9月以来,     

Construction and analysis of three-dimensional graphic model of single-chain Fv derived from an anti-human placental acidic isoferritin monoclonal antibody by computer

As a 24--iner consisting of different proportions of two main subunit types, named L and H,ferritin is a protein involved in iron storage. Inmammalian tissues, ferritin exists in differentmolecular forms (isoferritins )LI,2]. Previous studies showed that the acidic isoform of ferritin existing in the placenta, fetal tissues and malignant tissues was abnormally increased in the sera of patients with malignancies as well as in pregnantwomen at risk of having small--for--gestational ageinfants[3…     

Focal cerebral ischemia alters the spatio-temporal properties, but not the amount of locomotor activity in mice

Cerebral ischemia induces hyperlocomotion in gerbils, and sensorimotor and cognition dysfunctions in rodents ; however little is known about the spatio-temporal organization of locomotor activity after ischemia. In this study, we continuously （22 h） assessed the spatio-temporal organization of locomotor activity in focal cerebral ischemic mice in an open field with feeding and drinking supplies. To observe the spatio-temporal changes,