Testosterone inhibits immunoglobulin production by human peripheral blood mononuclear cells

We studied the in vitro effect of testosterone on spontaneous immunoglobulin production by human peripheral blood mononuclear cells (PBMC). Testosterone inhibited IgG and IgM production by PBMC both from males and females. The inhibitory effect of testosterone was revealed at doses more than 1 nm, increased dose-dependently, and reached a plateau at 100 nm. At doses <1000 nm, testosterone did not reduce cell viability. Testosterone treatment reduced IgG production by 59.0% and that of IgM by 61.3% compared with control. Immunoglobulin production by B cells was also suppressed by testosterone, though the magnitude of the suppressive effect on B cells was lower than that on whole PBMC; testosterone-induced decrease of IgG production compared with control was 26.9% and that of IgM was 24.9%. Exogenous IL-6 partially restored the impaired immunoglobulin production of testosterone-treated PBMC; IgG production in testosterone culture was increased by IL-6 from 35.6% to 66.5% of control and that of IgM was also increased from 38.9% to 71.2%, respectively. Testosterone treatment reduced IL-6 production of monocytes by 78.4% compared with control, but neither affected that of T cells or B cells. These results suggest that testosterone may suppress immunoglobulin production of human PBMC directly by inhibiting B cell activity and indirectly by reducing IL-6 production of monocytes. It is thus indicated that this hormone may have protective and therapeutic effects on human autoimmune diseases.     

光化学诱导的血栓形成性脑缺血及其代谢改变

本文用光化学法激发大鼠局部脑血栓形成，以组织病理学、局部脑血流量、皮层水含量、三磷酸腺苷、二磷酸腺苷，一磷酸腺苷、能量负荷、肌酸及乳酸为指标，探讨局部脑血栓形成后５天ｒＣＢＦ明显增高的可能机理。结果表明，血栓形成后局部脑组织ＡＴＰ水平进行性减少（Ｐ＜０．０１）、ＡＤＰ／ＡＴＰ及ＡＭＰ／ＡＴＰ比值明显升高（Ｐ均＜０．０１），ＬＡ及脑水含量显著增加（Ｐ＜０．０１）。这些因素既是能量衰竭、无氧酵解的结果     

社区人群癫癎患者抗癫癎治疗现状及效果分析

目的：研究社区人群癫痫患者药物治疗现状及影响其效果的主要因素。方法：于2000年在上海市金山朱泾镇采用分层整群抽样完成5万人群的癫痫普查，并对癫痫患者进行药物治疗现状调查和对服药者的血药浓度进行测定。结果：癫痫患病率为3.11%，标化患病率为3.62%。癫痫患者中从未服药者33.1%，曾服药者66.9%，目前正在服药者占35.6%，以单药治疗为主。治疗后显效者51.5%，有效者40.6%，无效或恶化者7.9%。服用单药者显效和有效的比例明显高于服用二种药或三种药的效果。服药者血药浓度在有效范围者，仅占36.1%，其中服用苯巴比妥者血药浓度达标的比例（71.4%），明显高于其他药物。血药浓度在有效范围内的显效率为53.3%，明显高于未达有效范围者的显效率（23.8%）。非条件Logistic回归分析显示与治疗效果有关的主要因素为病程、发作年龄、现年龄、发作频率、教育程度、服药类型、血药浓度等。结论：社区人群癫痫患者接受治疗的比例和服药后血药浓度达有效范围的比例都降低。治疗效果受多种因素影响。     

Polymorphism of the ABO blood group genes in Han, Kazak and Uygur populations in the Silk Route of northwestern China

Genetic polymorphism in the ABO blood group gene of Han, Kazak and Uygur populations inhabiting the most northwestern part of China was investigated using polymerase chain reaction-based techniques. The present study enrolled 43 healthy unrelated Han, 37 Kazak and 59 Uygur volunteers. The allele in A1 blood group is distinguished A0101 and A0102 in difference of nucleotide position 467. The A0101 allele is more frequent in Caucasian and the A0102 allele is characteristic in Mongoloid. It must be notable that A0201 in the A2 group (with a single base deletion at nucleotides 1059 to 1061) which was characteristic of Caucasian was observed in Kazak and Uygur populations but not in Han. Further, 00201 (with no nucleotide deletion at 261 and three nucleotide differences), which is frequent in different races including Caucasian except for Mongoloid, was detected also in Kazak and Uygur populations. The frequencies of B0101 in Kazak, Uygur and Han were comparable to those of other Asian populations but higher than those of Caucasian populations. Collectively, these results reveal that the allele frequencies of Kazak and Uygur at the ABO blood group locus are an intermediate between those of Mongoloid and Caucasian, suggesting the admixed feature of Kazak and Uygur with Mongoloid and Caucasian.     

磷酸盐型低密度脂蛋白亲和吸附剂制备与体外吸附试验研究

研究目的是制备低密度脂蛋白亲和吸附剂,用于去除高脂血症患者血液中高含量的低密度脂蛋白。首先以悬浮分散法制备壳聚糖微球和纤维素微球载体,然后固定磷酸吡哆醛和磷酸盐配基,制备出三种吸附剂,并进行体外静态吸附性能测试。结果表明,壳聚糖-磷酸吡哆醛吸附剂对LDL最大吸附量为1.30mg/mL,磷酸盐型壳聚糖和纤维素吸附剂对LDL的最大吸附量分别为2.72mg/mL和3.12mg/mL,并且吸附量随配基含量的增加呈增大趋势,3种吸附剂对高密度脂蛋白均无明显吸附。对吸附剂的灭菌和储存稳定性的研究表明,磷酸盐型纤维素吸附剂具有较好的稳定性。本研究第一次报道磷酸盐型低密度脂蛋白吸附剂。     

骨内植入式药物缓释系统载体材料研究现状及进展

植入式药物缓释系统在治疗骨科感染、肿瘤等方面具有良好的作用。随着组织工程学的进展,研制了不同的材料作为骨内植入式药物缓释系统的载体,拟对骨内植入式药物缓释系统载体材料研究现况及进展进行综述。     

The effect of tolbutamide on cerebral blood flow during hypoxia and hypercapnia in the anaesthetized rat

The increase in blood flow in the cerebral cortex of the anaesthetized rat during hypoxia and hypercapnia was investigated. Cerebral blood flow (CBF) was measured using the hydrogen clearance method with acutely implanted platinum electrodes. Hypoxia (PaO₂ 35.3±2.4 Torr) and hypercapnia (PaCO₂ 68.1±5.1 Torr) increased basal CBF from 76.3±9.0 ml/100g/min to 168.1±20.1 ml/100g/min and 162.4±31.9 ml/100g/min respectively. The sulphonylurea tolbutamide (1mM in 1%DMSO) had no significant effect on CBF in hyperoxia or in hypercapnia. However, it attenuated the increase of CBF during hypoxia by 66 ±11% (P<0.01). This suggests that opening of tolbutamide-sensitive potassium channels may be involved in the process of hypoxic vasodilation in the rat cerebral cortex.