Effect of naringin on bone cells.

Statin, a HMG-CoA reductase inhibitor, was shown to increase BMP-2 gene expression for bone formation, by blocking the mevalonate pathway in cholesterol production. We investigated the effect of naringin, a flavonoid available commonly in citrus fruits, which was also a HMG-CoA reductase inhibitor, in UMR 106 osteoblastic cell line in vitro. The control group consisted of cells cultured without any intervention for different time intervals (24 h, 48 h, and 72 h), whereas the experimental (naringin) group consisted of cells cultured with naringin of different concentrations (0.001 micromol/L, 0.01 micromol/L, and 0.1 micromol/L) for the same time intervals of the control. Colorimetric Tetrazolium (MTT) assay, total protein content assay, and alkaline phosphatase activity were used to measure the cellular activities. Results for the naringin group showed an increase in MTT assay compared with the control and the effect was dose dependent. At high concentration (0.1 micromol), the increases ranged from 60% to 80%. In the total protein content assay, naringin also showed an increase compared with control and the effect was also dose dependent. At high concentration (0.1 micromol), the increases ranged from 9% to 20%. In the alkaline phosphatase activity assay, naringin at high concentration (0.1 micromol) significantly increased the activity up to 20%. In conclusion, naringin significantly increased bone cell activities in vitro. This is the first study specifically attempted to investigate the effect of naringin on bone cell activities. Besides statin, this provided another example of mevalonate pathway blockage in the cholesterol production pathway by HMG-CoA reductase inhibition will increase the bone cell activities.     

Bilateral salpingectomy does not compromise ovarian stimulation in an in-vitro fertilization/embryo transfer programme

The question whether salpingectomy has a negative influenceon ovarian function and the outcome of pregnancy in an in-vitrofertilization (IVF) and embryo transfer treatment programmeis not yet answered. We performed a retrospective case-controlstudy to investigate the possible negative effect of salpingectomyon ovarian response to human menopausal gonadotrophins (HMG)during IVF and embryo transfer. The study group was composedof 26 patients with bilateral salpingectomy. In 67 cycles weanalysed different parameters of ovulation such as the numberof days of ovarian stimulation, numbers of ampoules of HMG,pre-ovulatory oestradiol concentrations and the numbers of oocytesretrieved. These parameters were compared to a control groupof 134 cycles in 134 women with healthy Fallopian tubes. Nodifferences were found. Implantation ratio, pregnancy rate andoutcome were the same in both groups. We conclude that bilateralsalpingectomy had no detrimental effect on ovarian performanceduring IVF and embryo transfer treatment nor on the outcome.     

Lipidstatus und basale Steroidhormonspiegel nach 16 Wochen Lovastatintherapie bei primärer Hypercholesterinämie

Summary We examined the effect of a 16 week therapy with the HMG CoA reductase inhibitor lovastatin in 29 patients (mean age 43 years) with primary hypercholesterolemia. All patients had cholesterol levels above 250 mg/dl (mean 348 ±96 mg/dl) inspite of a lipid lowering diet and a therapy with conventional lipid lowering drugs during a three month screening period. After 4 weeks on placebo 20 mg lovastatin was given orally for 4 weeks. If total cholesterol exceeded 200 mg/dl the dose of lovastatin was increased monthly by 20 mg up to the maximal dose of 80mg/day. After 16 weeks lipid values changed compared with the placebo period: total-cholesterol –25%, triglycerides –8.6%, LDL-cholesterol –31%, APO B –25%, HDL-cholesterol +5.8%, APO AI +0.8%, total-cholesterol/HDL-cholesterol –25%. There was a significant improvement of lipid parameters after lovastatin therapy compared with conventional lipid lowering drugs at the end of the screening period. Lovastatin was well tolerated. A small and reversible rise of transaminases and/or creatinine kinase was observed in 6 patients. Basal levels of ACTH in the morning increased significantly during lovastatin therapy within the normal range. This observation was more frequent in females (10/12) than in males (10/ 17).

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Abkürzungen HMG Co A 3-Hydroxy-3-Methyl-Glutaryl-Coenzym A - TChol Gesamtcholesterin - LDL low density lipoprotein - HDL high density lipoprotein - TG Triglyceride - APO AI/B Apolipoprotein AI/B - ACTH Adrenocorticotropes Hormon Diese Publikation enthält Ergebnisse des Dissertationsarbeit von Frau Angela Bink.     

Oocyte and embryo quality as well as pregnancy rate in intracytoplasmic sperm injection are not affected by high follicular phase serum progesterone

The effect of elevated serum progesterone concentrations (>1ng/1) on or before the day of human chorionic gonadotrophin(HCG) injection on the outcome of women receiving gonadotrophin-releasinghormone analogue (GnRHa)/ human menopausal gonadotrophin (HMG)for ovarian stimulation prior to intracytoplasmic sperm injection(ICSI) was evaluated. A total of 1275 ICSI cycles were analysedretrospectively. In 53 cycles (4.5%), serum progesterone concentrationswere > 1 ng/ml. Patients in the high progesterone group hadsignificantly higher oestradiol and luteinizing hormone concentrationson the day of HCG injection. The characteristics of the cumulus-coronacell complexes and the nuclear maturity of the oocytes weresimilar in the groups of patients with high and low serum progesteronelevels. Fertilization and cleavage rates as well as embryo qualitywere not different in the two groups. No difference in implantationor clinical pregnancy rates was observed between the high progesteroneand low progesterone groups. Moreover, the cumulative exposureto progesterone during the follicular phase, as expressed bythe area under the curve (AUC), and the duration of exposureto high serum progesterone levels (>1 ng/ml) were not significantlydifferent between pregnant and non-pregnant women in the highprogesterone group. We conclude that in ICSI cycles pretreatedwith GnRHa, increased serum progesterone concentrations on orbefore the day of HCG injection do not affect ICSI outcome.     

INHIBITORY EFFECT OF FLUVASTATIN ON AORTIC INTIMAL THICKENING IN NORMOCHOLESTEROLEMIC RABBITS

Objective, The anti-atherosclerotic effect of fluvastatin at doses insufficient to lower serum cholesterol on the catheter-induced intimal thickening and possible mechanism were investigated in abdominal aorta of rabbits. Methods. Fifty-six rabbits were randomly divided into eight groups( n = 7, each). Fluvastatin was given mixed with food at daily dose of 8mg/kg starting 5 days before catheterization. Light microscope, immanohistochemistry, transmis-sion electron microscope and RT-PCR assay were applied to assess vascular smooth muscle cell (VSMC) proliferation and apoptosis, as well as oncogene expression in vascular wall. Results. At day 10 and day 15 after catheter induced denudation intima/media( I/M) thickness ratio was obviously higher, and also the percentage of PCNA-positive cells and TUNEL-positive cells in media was significantly higher compared with controls. The intimal hyperplasia was mostly composed of α-SM-actin-pesitive cells. In rabbits given flu-vastatin I/M ratio and the percentage of these positive cells significantly decreased compared with those without fluvas-tatin.The overexpression of proto-oncogene H-ras mRNA and decreased expression of anti-oncogene p53 mRNA were found after vascular injury, whereas fluvastatin significantly reduced H-ras mRNA and increased p53 mRNA expres-sion. Conclusion. Proliferation of VSMC in the media and the migration to the intima can be inhibited, and apoptosis of VSMC be induced by short-term use of fluvastatin after balloon catheter denudation, independent of serum lipid change. The underlying mechanism is presumably associated With the influence of fluvastatin on oncogene expression in the injured vascular Wall.     

石榴叶鞣质对高血脂高血糖模型动物脂代谢的影响

目的 :观察石榴叶鞣质对高脂模型鼠脂代谢的影响 ,以及体外对HMG CoA还原酶的抑制作用。方法 :造大鼠高脂模型 ,以四氧嘧啶诱导高血糖伴高血脂小鼠模型 ,检测TC、TG等生化指标 ;制备大鼠肝微粒体HMG CoA还原酶液 ,测 1min内A34 0nm的变化。结果 :石榴叶鞣质大中剂量 (15 0、75mg kg)对高脂大鼠的TC和TG具有显著的降低作用 ,大小剂量 (30 0、75mg kg)对高血糖伴高血脂小鼠的TC降低作用明显 ,体外抑制HMG CoA还原酶的最低有效浓度为 1× 10 - 6 g mL ,抑制率 15 16 %。结论 :石榴叶鞣质对高脂模型鼠脂代谢紊乱具有较好的调节作用 ,体外可较强的抑制HMG CoA还原酶活性。     

第5批人绝经尿促性腺素国家标准品的制备与标定

目的:制备和标定第5批人绝经尿促性腺素(HMG)国家标准品.方法:以WHO第5批国际标准品10/286作为标准,选择6个实验室,采用《中华人民共和国药典》2015年版四部1216卵泡刺激素(FSH)测定法和1217黄体生成素(LH)测定法对第5批HMG国家标准品待标品的生物效价进行标定;按照2015年版药典四部通则14...     

Lovastatin对HL-60细胞HMG-CoA还原酶mRNA表达及细胞增殖功能的影响

目的探讨胆固醇合成抑制剂洛伐他汀(10vastatin,LOV)对HL-60细胞HMG-CoA还原酶mRNA表达及细胞增殖功能的影响.方法采用MTT比色法、生长曲线测定、计算细胞生长抑制率、流式细胞仪分析、以及RT-PCR等技术方法,观察LOV对HL-60细胞体外增殖能力、细胞周期分布及HMG-CoA还原酶mRNA表达的影响.结果HL-60细胞经LOV处理后,生长减慢,细胞周期被阻滞在G0/G1期,LOV剂量越大,时间越长,增殖抑制作用越明显;LOV处理HL-60细胞1～3 d,低剂量组(4 lμmol/L)HMG-CoA还原酶mRNA表达上调;而中剂量组(8μnol/L)和高剂量组(16μmol/L)第1天有增加趋势,第2～3天明显降低.结论LOV能显著抑制HL-60细胞增殖,使细胞受阻于G0/G1期,该作用有明显剂量-效应和时间依赖关系;随洛伐他汀处理剂量和时间的不同,HL-60细胞HMG-CoA还原酶mRNA表达表现为上调或下调变化.     

非小细胞肺癌患者肿瘤组织乳酸脱氢酶A和Sox-2基因的表达及其临床意义

目的 探讨非小细胞肺癌(NSCLC)患者肿瘤组织的乳酸脱氢酶A(LDHA)和正性别决定区Y框蛋白-2(Sox-2)基因的表达情况及其临床意义.方法 选择54例NSCLC患者,采用实时定量聚合酶链式反应检测肿瘤组织及癌旁组织中LDHA和Sox-2基因的表达水平,分析肿瘤组织中LDHA和Sox-2基因的表达水平与临床病理特征的关系,以及肿瘤组织LDHA与Sox-2基因表达水平的关系.结果 NSCLC肿瘤组织的LDHA和Sox-2相对表达均高于癌旁组织(P＜0.05).肿瘤细胞分化程度低者肿瘤组织LDHA、Sox-2表达量高于分化程度高者(P＜0.05).肿瘤组织LDHA与Sox-2基因表达水平呈正相关(P＜0.05).结论 NSCLC患者肿瘤组织中LDHA和Sox-2表达均有升高,两者在肿瘤发生发展中具有协同作用.