Lamin B1 regulates the growth of hepatocellular carcinoma cells by influencing telomerase activity / 生物工程学报

Lamin B1 (LMNB1) is highly expressed in liver cancer tissues, and its influence and mechanism on the proliferation of hepatocellular carcinoma cells were explored by knocking down the expression of the protein. In liver cancer cells, siRNAs were used to knock down LMNB1. Knockdown effects were detected by Western blotting. Changes in telomerase activity were detected by telomeric repeat amplification protocol assay (TRAP) experiments. Telomere length changes were detected by quantitative real-time polymerase chain reaction (qPCR). CCK8, cloning formation, transwell and wound healing were performed to detect changes in its growth, invasion and migration capabilities. The lentiviral system was used to construct HepG2 cells that steadily knocked down LMNB1. Then the changes of telomere length and telomerase activity were detected, and the cell aging status was detected by SA-β-gal senescence staining. The effects of tumorigenesis were detected by nude mouse subcutaneous tumorigenesis experiments, subsequent histification staining of tumors, SA-β-gal senescence staining, fluorescence in situ hybridization (FISH) for telomere analysis and other experiments. Finally, the method of biogenesis analysis was used to find the expression of LMNB1 in clinical liver cancer tissues, and its relationship with clinical stages and patient survival. Knockdown of LMNB1 in HepG2 and Hep3B cells significantly reduced telomerase activity, cell proliferation, migration and invasion abilities. Experiments in cells and tumor formation in nude mice had demonstrated that stable knockdown of LMNB1 reduced telomerase activity, shortened telomere length, senesced cells, reduced cell tumorigenicity and KI-67 expression. Bioinformatics analysis showed that LMNB1 was highly expressed in liver cancer tissues and correlated with tumor stage and patient survival. In conclusion, LMNB1 is overexpressed in liver cancer cells, and it is expected to become an indicator for evaluating the clinical prognosis of liver cancer patients and a target for precise treatment.

Research on Cardiac Structure and Function in the Overweight and Obese population and Influence Factors / 生物医学工程学杂志

In this study we performed Tissue Doppler Imaging (TDI), two-dimensional speckle tracking imaging (2D- STI) and three-dimensional speckle tracking imaging (3D-STI) on enrolled healthy, overweight and obese groups (34 subjects in each group), respectively, to analyze cardiac structure and its function. Compared with healthy group, global longitudinal strain (GLS), global circumferential strain (GCS), global area strain(GAS) and global radial strain (GRS) decreased progressively (P < 0.05). The ratio of early diastolic mitral inflow velocity to global early diastolic strain rate of left ventricle (E/e'sr) (r = 0.466, P < 0.001), GLS (r = 0.502, P < 0. 001), GCS (r = 0.426, P < 0.001), GAS (r = 0.535, P < 0.001) and GRS (r = -0.554, P < 0.001) were correlated with body mass index (BMI). E/e'sr (r = 0.37, P = 0.003), GLS (r = 0.455, P < 0.001), GCS (r = 0.282, P = 0.02), GAS (r = 0.412, P < 0.001) and GRS (r = -0.471, P < 0.001) were correlated with free fatty acid (FFA). Stepwise multiple linear regression revealed that BMI was independently correlated with E/e'sr, GLS, GCS, GAS and GRS. Waist to hip ratio (WHR) was independently correlated with GLS, GCS, GAS and GRS. FFA was independently correlated with E/e'sr (P < 0.05). The study showed that cardiac structure changed and impaired left ventricular global systolic and diastolic function in overweight and obes population. Moreover, BMI, WHR and FFA may be independent influence factors of cardiac function in overweight and obese population.

Assessment of global left ventricular function in hypertensive patients with normal ventricular geometry using global area strain / 生物医学工程学杂志

We sought to explore the feasibility of global area strain to assess left ventricular global systolic function in patients with essential hypertension and normal ventricular geometry. Thirty-five essential hypertensive patients with normal ventricular geometry and 30 normally healthy persons as controls were enrolled in this study. The two groups were comparable for age, sex ratio, height, weight, body mass index (BMI), and heart rate. Blood pressures (BPs) were significantly higher in the hypertension group than the control group. Two-dimensional echocardiography and three-dimensional speckle tracking imaging were performed. Left ventricular global area strain (GAS), global longitudinal strain (GLS), global circumferential strain (GCS), global radial strain (GRS), LV volumes, ejection fraction (EF), sphericity index (SPI), left ventricular end-diastolic and end-systolic mass (EDmass and ESmass) and LV mass index (EDmassI and ESmassI) were obtained. Compared with those of the controls, GAS, GLS, GCS, GRS were significantly reduced in hypertensive patients Call P < 0.001). GAS (r = 0.672, P < 0. 001), GLS (r = 0.587, P < 0.001), GCS (r = 0.639, P < 0.001) and GRS (r = 0.685, P < 0.001) were correlated with EF in the pooled population. GAS showed an excellent correlation with GCS (r = 0.905, P < 0.001), GLS (r = 0.892, P < 0.001) and GRS (r = 0.990, P < 0.001). EF measured with 3D-STI was significantly lower in group of hypertension (P < 0.001) than that in the controls. There were no significant differences between the two groups in cardiac output, sphericity index, EDmass and ESmass, LV mass index (EDmassI and ESmassI) calculated with 3D-STI. The study showed that GAS could identify early changes of left ventricular global systolic function in hypertensive patients with normal ventricular geometry.

The Relationship between the Clinicopathologic Characteristics of Triple Negative Breast Cancer and EGFR Expression / 中国肿瘤临床

Objective:To study the clinicopathologic characteristics and the prognostic factors of triple negative breast cancer,and to study the correlation between clinicopathologic features and EGFR expression.Methods:Clinical characteristics and prognosis of 200 breast cancer patients diagnosed between 1997 and 2004 were reviewed.The paraffin embedded tissues were selected and tissue microarray blocks were made.Immunohistochemical staining was used to evaluate the expression of ER,PR and HER2 for breast cancer molecular type.EGFR expression was evaluated to analyze its correlation with the clinical characteristics and prognosis.Results:Fourty-two cases(21%)of 200 were triple negative breast cancer(TNBC).There was no significant difference between TNBC and non-TNBC in clinicopathologic parameters such as age,tumor size,clinical stage,and lymph node status.However,there was significant difference in histological category and menostasis status between the two groups(P<0.05).Among TNBC,17 0f 42 died during the follow-up(the overall suivival rate was 59.52%),while 26 0f 158 non-TNBC died(the overall survival rate was 83.54%).EGFR was significantly overexpressed in TNBC(69.05%)and it was associated with lymph node status and histological category.Conclusion:Although the incidence of TNBC is low,it has a poorer prognosis than other subtypes.EGFR is highly expressed in TNBC and may serve as a prognostic index and an important therapatic target for breast cancer.

Recent advances in bacterial biodegradation of naphthalene, phenanthrene by bacteria: a review / 生物工程学报

Polycyclic aromatic hydrocarbons (PAHs) are toxic pollutants that exist extensively in the environment. Microbial degradation is the main pathway of PAHs eradication in natural environment and therefore is of importance to investigate. Advancement has been made in recent years regarding the PAHs molecular degradation mechanisms in bacteria. In this review, we summarized some of the research progresses in microbial PAHs biodegradation pathways (including salicylate pathway and protocatechuate pathway), key enzymes (nah-like, phn, phd, nid and nag) and genes involved. Emphasis was given on naphthalene and phenanthrene which were often used as the representatives of PAHs. It is likely that the new information will promote further research and applications of microbial PAHs biodegradation technology.

Quantitative structure-cytotoxicity relationship of anti-HIV 5-phenyl-1-phenylamino-1H-imidazole derivatives / 药学学报

Both AM1 semi-empirical quantum chemistry method and HF/3-21g* ab initio method were employed to get related parameters or descriptors, particularly, the parameters of the solvation energy delta G with polarizable continuum model, for 42 anti-HIV 5-phenyl-1-phenylamino-1H-imidazole derivatives with known cytotoxicity. With parameters of quantum chemical calculation and traditional ones, 2 multiple linear regression models were obtained. The better regression equation has a high correlation coefficient (r = 0.938) and a low standard deviation (s = 0.125) and the squared correlation coefficient Q2 of the cross-validation is 0.799 (literaure: 0.740) by leave-one-out method. The results have certain significance for the design of new anti-HIV-1 drugs with lower cytotoxicity.