硫化氢对体外大鼠肝星状细胞内Ca2+浓度变化及细胞增殖的影响

目的 研究硫化氢(H₂ S)对大鼠肝星状细胞-T6(HSC-T6) Ca²⁺浓度、细胞增殖的影响及其机制。 方法 活化HSC-T6用含10%小牛血清DMEM培养液制备为1×10⁵个肝星状细胞(HSC)悬液。钙离子荧光探针Fluo-3/AM负载细胞后，在不同刺激条件下，利用激光扫描共焦显微镜动态扫描HSC-T6细胞内Ca²⁺荧光强度（FI）变化，FI表示细胞内Ca²⁺浓度。四唑盐比色法，观察不同浓度H₂S供体——NaSH对HSC-T6细胞增殖的影响。 结果 低浓度H₂S（100μmol/L）明显降低HSC-T6细胞内Ca²⁺浓度（P<0.05)，而细胞增殖增加（增殖率为116%）；K_ATP通道阻断剂——格列本脲可阻断H2S的作用。高浓度H₂S（1mmol/L）刺激HSC-T6细胞内Ca₂₊浓度增加，但细胞增殖无明显变化(P＞0.05)。 结论 低浓度H₂S通过激活HSC-T6细胞K_ATP通道降低细胞内Ca²⁺浓度，可能通过调节细胞氧化应激促进细胞增殖；高浓度H2S刺激HSC-T6细胞内Ca₂₊浓度增加。提示H₂S在肝硬化门脉高压症的发生机制中具有双重作用。     

基于复杂网络的《新针灸学》与《经络腧穴学》比较分析研究（英文）

提取《新针灸学》《经络腧穴学》中穴位名称、主治病症信息,基于复杂网络建立穴-症网络,分析两者穴位数量、相互关联程度及主治规律变化,借助拓扑学数据解释变化原因,为传统针灸知识体系的结构化、标准化研究提供具体思路和方法。共纳入《新针灸学》386穴、773种症状、形成152163个穴位配伍对,《经络腧穴学》403穴、253种症状、28755个穴位配伍对。两本教材的穴-症网络存在丰富的差异性,其所载的病症结构化程度随医学知识的更新而提升。《新针灸学》模型具有更加典型的小世界效应,或因其以病症为主要分类手段的优势体现。两本教材穴位定位与主治方面发生许多变化,学科发展、时代背景等方面是变化的主要原因。     

生物材料聚酰胺-胺树状大分子合成及其体外细胞相容性评价

主要通过Michael加成和酰胺化逐步迭代合成反应得到聚酰胺-胺（PAMAM）树状大分子并对合成产物进行了结构表征。对生物医学有潜在应用价值的第五代（G5．0）提出了廉价易行的合成提纯步骤并通过细胞计数、MTF检测和FCM对L-929细胞系进行了体外生物相容性评价分析。结果表明，按照本试验的合成及纯化所得PAMAM G5．0对L-929细胞系在给药范围内无细胞毒性，无致瘤性，有良好的细胞相容性。     

尼美舒利对食管鳞癌细胞的增生抑制和诱导凋亡作用

目的研究特异性环氧化酶-2抑制剂尼美舒利对食管鳞癌细胞的增生抑制和诱导凋亡作用。方法EC109细胞与不同浓度的尼美舒利共同孵育。1)用MTT方法研究细胞增生抑制作用;2)用荧光标记的流式细胞检测技术研究尼美舒利的诱导凋亡作用;3)检测细胞培养上清液中前列腺素E2质量浓度,观察尼美舒利对环氧化酶功能的影响。结果尼美舒利抑制食管鳞癌细胞增生,呈浓度及时间依赖性;尼美舒利可诱导食管鳞癌细胞凋亡,可抑制前列腺素E2的合成。结论尼美舒利抑制食管鳞癌细胞增生诱导凋亡作用,可能是通过抑制前列腺素E2的合成而实现的。环氧化酶-2抑制剂有可能在食管鳞癌的预防及治疗上发挥重要作用。     

Homozygous familial hypercholesterolemia in China: Genetic and clinical characteristics from a real-world,multi-center,cohort study

BackgroundThere is a lack of large-scale data on the clinical and genotype characteristics of homozygous familial hypercholesterolemia (HoFH) patients in Asia.ObjectiveTo define the characteristics of phenotypic and genetic HoFH probands from mainland China.MethodsWe collected data from patients with suspected HoFH from ten clinical hospitals across mainland China from 2003 to 2019. Clinical data and DNA testing were obtained in all patients. The Kaplan-Meier method was used to generate survival curves, and the groups were compared with the log-rank test.ResultsA total of 108 unrelated probands with suspected HoFH (mean age 14.9 years) were included. The three most common variants were W483X (c.1448 G>A), A627T (c.1879 G>A), H583Y (c.1747 C>T). The majority (64.8%) were compound heterozygotes (n = 70), 23 (21.3%) were true HoFH patients. True HoFH showed higher LDL-C levels compared to compound HoFH (16.8±3.6 mmol/L vs. 15.0±3.1 mmol/L, P = 0.022). During follow-up, only 21.2% patients exhibited an LDL-C reduction of more than 50%. Kaplan-Meier analysis showed that the true HoFH probands had significantly worse survival rates compared to other genotype probands (13-year survival; 20.3% vs. 76.7%, respectively; P = 0.016). In addition, true HoFH shows that 2.8-fold (P = 0.022) increase any death and 3.0-fold (P = 0.023) increase cardiovascular death risk in relative to other FH.ConclusionsThis report shows that HoFH has devastating consequences, and that patients are often only diagnosed after they have been exposed to severely elevated LDL-C for years. Systematic screening and early intensive treatment are an absolute requirement for these young individuals with HoFH.     

Incidence of sudden unexpected death in epilepsy in community-based cohort in China

ObjectiveSudden unexpected death in epilepsy (SUDEP) is associated with the high premature mortality observed among people with epilepsy. It is, however, considered a rare event in China, probably because of lack of awareness and limitation of studies in the country. We aimed to provide some initial estimation of the burden of SUDEP in China.MethodsWe established a large Chinese community-based cohort of people with epilepsy between January 2010 and December 2011. For any participant who died during follow-up, detailed information on cause of death was obtained using a specifically designed Verbal Autopsy Questionnaire. All cases were reviewed by a multidisciplinary expert panel and reinvestigated if necessary. Sudden unexpected death in epilepsy incidence rates were estimated and case details provided.ResultsThe cohort consisted of 1562 people and during a median 5 years follow-up, 72 deaths were reported. The all-causes death incidence was 11.23 (95% CI 8.86–14.07) per 1000 person-years. Fifteen died suddenly and unexpectedly in a reasonable state of health in the week preceding death. We recorded detailed information of these 15 deaths. Thirteen were considered to be probable SUDEP and two possible SUDEP. The incidence of probable SUDEP was 2.03 (95% CI 1.13–3.38) per 1000 person-years, and the incidence of all suspected (probable and possible) SUDEP was 2.34 (95% CI 1.36–3.77) per 1000 person-years.SignificanceThe incidence of SUDEP was relatively high among Chinese people with epilepsy when compared with that in previous community-based studies from high-income countries. The burden of SUDEP in China requires further assessments.