BACKGROUND: Shape memory polyurethane (SMPU) may be employed for bone repair capable of resisting stress shielding and bone non-union due to the shape memory effect responding to changed external temperature. Evaluating the cytocompatibility of SMPU is important for its further in vivo experiments and applications. However, few have been done to investigate the cytocompatibility of SMPU after encounted from deforming and shape recovering.OBJECTIVE: To evaluate the osteoblast compatibility of SMPU before and after stretching-shape recovering process. METHODS: Solvent casting method was used to fabricate SMPU films; the obtained SMPU films were stretched to 200%, and then fixed and finally recovered to its odginal shape at T_g+15 ℃, T_g-15 ℃ and T_g+15 ℃, respectively. Atomic force microscope (AFM) with tapping mode was employed to probe the surface morphology and phase separation of SMPU. Primary osteoblasts at 3-5 passages were seeded on SMPU films in vitro to evaluate the adhesion, proliferation and spreading of osteoblasts. RESULTS AND CONCLUSION: There were obvious and regular phase separation resulted from soft segments and hard segments in SMPU, and some groove-ddge architectures within a scale of micrometers were produced by the stretching-shape recovering process. These special micropatterned structures promoted osteoblast adhesion and proliferation, and also resulted in partially oriented cell growth along the grooves. Shape memory process, i.e. stretching-shape recovering process may obviously change the surface morphology of SMPU films, and suggesting better biocompatibility with osteoblasts.

OBJECTIVE: To compare inhibition effects of arsenacetylic acid(ASAC) on experimental H22 hepatoma-bearing mice in different forms of administration. METHODS: The mice were divided into 5 groups at random after inoculated with H22 hepatoma into their right axillas hypodermic by intraperitoneal injection(ip) and intravenous injection(iv), and then injected with normal saline,cyclophosphamide and different dosage of ASAC, observe the rate of tumor strain becoming tumor, the inhibition effects of the subjects and the effects of the subjects on mice's viscera. RESULTS: Compared with ip,either high, moderate or low dosage of ASAC by iv did have an obvious inhibitory effect on tumor and the tumor inhibition rates were 46.59%, 46.31% and 32.48% respectively; however, the spleen index in groups that of lower dosage of ASAC by two forms of drug administration were increased; there were death by poisoning in the group that iv with high dosage of ASAC.CONCLUSION: Compared with ip, the administration of ASAC by iv has a better effect on tumor.

Objective To study effect of a novel schiff base ruthenium coordination compound on cell proliferation and apoptosis of gastric cancer SGC-7901 cell.Method Gastric cancer SGC-7901 cell were divided into four groups according to different treatment of novel schiff base ruthenium coordination compound (concentration of 10, 30, 50μmol/L) and blank group with DMSO.Cell proliferation was detected by MTT assay, cell apoptosis and cell cycle were analysed by flow cytometry.ResuIts MTT results showed the inhibitory effect of novel schiff base ruthenium coordination compound on SGC-7901 cell enhanced with the increase of its concentration, and inhibitory rates were higher than that of blank group at 24, 48, 72 h.Flow cytometry results showed the apoptosis rate of novel ruthenium coordination compound groups of 10, 30, 50μmol/L were (17.64 ±1.21)%, (26.47 ± 0.61)%, (55.63 ±1.49)%, respectively, all higher than that of blank group (P<0.05).The cell proportion of G1 phase increased with the increasing of the novel schiff base ruthenium coordination.ConcIusion A novel schiff base ruthenium coordination compound could inhibit the growth of gastric cancer SGC-7901 cells, promote apoptosis and arrest gastric cancer SGC-7901 cells at G1.

Objective To investigate the correlation between gastric polyps and helicobacter pylori (Hp) infection .Methods 150 patients with gastric polyps(experimental group) and 150 patients with chronic gastritis(control group) from October 2011 to No-vember 2012 in Shapingba people′s hospital of Chongqing were enrolled in this study .The polyps biopsy in patients with gastric polyps and the mucosa in gastric antrum big and small bends ,and the anterior and posterior walls(about 2-5 cm from the pylorus) from both groups were detected for the pathological type ,inflammation degree and stained(modified Giemsa staining) for detection of the existence of Hp .Results In 150 patients with gastric polyps ,58% (87/150) of the cases were infected by Hp mainly in medi-um and low degree ,in which 39 .3% (59/150) of the infection located at polyps and 42% (63/150) of the infection occurred out of polyps .Pathological analysis for this group further demonstrated that the types of hyperplastic polyps ,fundic gland polyps ,inflam-matory polyp and adenomatous polyps accounted for 68 .0% (102 cases) ,20 .7% (31 cases) ,9 .3% (14 cases) and 2 .0% (3 cases) of total 150 gastric polyps cases ,of which 63 .7% (65/102) ,38 .7% (12/31) ,57 .1% (8/14) and 66 .7% (2/3) cases were infected by Hp ,respectively .Pathological analysis also indicated that ,among total 150 gastric polyps cases ,single polyps and multiple polyps types accounted for 62 .0% (93 cases) and 38 .0% (57 cases) .The polyps commonly existed at gastric fundus in which the incidence rate of the hyperplastic polyps type and the fundic gland polyps type were 94 .1% (96/102) and 87 .1% (27/31) ,respectively .The infection rate in hyperplastic polyps was markedly higher than that in fundic gland polyps (P<0 .05) ,and the infection of hyperplas-tic polyps was mainly medium and high degrees .In addition ,the inflammatory response in the hyperplastic polyps was higher ,ac-companied by the intestinal metaplasia and atrophy of gastric mucosa ,as compared with non-hyperplastic polyps .In the total 150 control cases ,52 .0% (78/150) patients were infected by Hp with mainly medium and high degree .Results indicated that there is no relationship between polyps occurring and Hp infection .Conclusion Compared to the chronic gastritis ,there is no positive associa-tion between gastric polyps and Hp infection .There is no remarkable difference for Hp infection rate and degree between the polyps and the non-polyps sites in the stomach .The infection rate and infection degree of hyperplastic polyps is significantly higher than that of fundic polyps .However ,the underlying mechanisms for the development of hyperplastic polyps have to be elucidated in the future .

Objective To evaluate the value of MR angiography in thrombolytic therapy of acute ischemic stroke. Methods According to inclusion criteria, 65 patients who also having large vessel occlusion were selected, and they were performed rt-PA treatment (38 patients) and routine treatment (27 patients) within 3-6 hours of onset of symptoms, respectively. Mann-Whitney U test and chi square test were performed to compare the clinical and MR imaging baseline index and the clinical outcome between the two groups respectively. Clinical outcome was assessed after 3 months using a dichotomized modified Rankin scale score.Data were also compared with the combined analysis of the ATLANTIS, ECASS, NINDS rt-PA trials. Resets The difference of clinical outcome in 3 months between the two groups was significant (P < 0. 05) and the median of the two group was 1 and 3, respectively. The ratio of favorable outcome (mRS 0-1) in the two groups was 52. 6% (20/38) and 33.3% (9/27), respectively. Conclusion MR angiography plays an important role in thrombolytic therapy of acute ischemic stroke and it should be used to consummate the conventional inclusion criteria, the patients with large vessel occlusion should be treated by rt-PA.

OBJECTIVEWe ascertained the effect of bone morphogenetic protein-2 (BMP-2) and basic fibroblast growth factor (bFGF) by a series of experiments: Proliferation and differentiation of bone marrow stromal cells (BMSCs) in vitro, ectopic and in situ bone formation and loaded porous calcium phosphate cement (CPC) on the repair of bone defects around dental implants.

METHODSBMSCs from Beagle dogs were cultured in vitro with basic culture medium containing BMP-2, bFGF, and BMP-2+bFGF. Proliferation and differentiation of BMSCs were quantified using methyl thiazolyl tetrazolium (MTT) and alkaline phosphatase (ALP) test. The CPC seeded with BMSCs and BMP-2, bFGF, combined BMP-2 with bFGF were implanted subcutaneously into nude rats in ectopic bone formation, and were implanted into critical-sized bone defects of Beagle dogs in the in situ bone formation. The bone formation was detected by histology examination and quantified using an image analysis system. Polychrome sequential fluorescent labels and fluorescence histological examinations of undecalcified sections were performed post-operatively.

RESULTSIt was determined that BMP-2+bFGF promoted BMSCs statistically significant proliferation and differentiation compared to either BMP-2 or bFGF in vitro. The CPC with BMP-2+bFGF group yielded more bone than those with either BMP-2 or bFGF in ectopic bone formation test. The percentages of newly ectopic formed bone were higher in the BMP-2+bFGF group (48.79% +/- 11.31%) than those in other groups (BMP-2 group, 30.71% +/- 10.85%; bFGF group, 27.33% +/- 9.67%; and the control group, 10.65% +/- 6.05%). Undecalcified showed that new bone was actively formed in the BMP-2+bFGF group after 12 weeks in the in situ bone formation test. The bone mineralization apposition rate (MAR) was better in the BMP-2+bFGF group than in other groups (P<0.01).

CONCLUSIONBMP-2 combined with bFGF are more effective than one alone in promoting the formation of new bone.

Animals ; Bone Marrow Cells ; Bone Morphogenetic Protein 2 ; Bone and Bones ; Calcium Phosphates ; Cell Differentiation ; Cells, Cultured ; Dogs ; Fibroblast Growth Factor 2 ; Mesenchymal Stromal Cells ; Rats

The main objective of this study was to observe the adhesion, proliferation and differentiation of mouse osteblast-like MC3T3-E1 cells cultured on maleic anhydride-modified poly(D,L-lactic acid) (MPLA) and poly(D,L-lactic acid) (PDLLA) polymers, and to evaluate the cytocompatibility of MPLA polymer. The effects of MPLA and PDLLA polymers on the morphology, adhesion, proliferation, the content of total cellular protein, alkaline phosphatase (ALP) activity and the content of Ca of MC3T3-E1 cells were explored. These results indicated that MC3T3-E1 cells on MPLA polymer adhered and spread more fully. On MPLA polymer, the proliferation, total protein content, ALP activity, Ca content of the cells were significantly higher than those of the cells on PDLLA polymer (P < 0.01). It was concluded that MPLA polymer could promote the adhesion, spreading, proliferation and the synthesis of protein of osteoblasts, and also induced the differentiation and mineralization of osteoblasts, suggesting that MPLA polymer might have the better cytocompatibility than PDLLA.
Animals ; Biocompatible Materials ; chemistry ; pharmacology ; Cell Adhesion ; drug effects ; Cell Differentiation ; drug effects ; Cell Line ; Cell Proliferation ; drug effects ; Embryo, Mammalian ; Lactic Acid ; chemistry ; pharmacology ; Maleic Anhydrides ; chemistry ; pharmacology ; Mice ; Osteoblasts ; cytology ; Polyesters ; Polymers ; chemistry ; pharmacology

This experiment was designed to study the apoptosis and related mechanism of adherent liver tumor cells (SMMC-7721) and adherent normal liver cells (HL-7702) when they were exposed to the steep pulse generated by the steep pulse apparatus for tumor treatment. The results showed that the steep pulse of 200 V could induce tumor cells apoptosis. The tumor cells presented with their apoptosis when they were exposed to the steep pulse from 200 V to 250 V. Laser scanning confocal microscopy was used to make a real time study of calcium burst when the adherent tumor cells were exposed to the steep pulse. The results showed:On the condition of no extracellular Ca2+, the concentration of Ca2+ in tumor cells exposed to the steep pulse of 150 V did not change; the concentration of Ca2+ in tumor cells exposed to the steep pulse of 200 V decreased; the concentration of Ca2+ in tumor cells exposed to the steep pulse of 250 V decreased more evidently. On the condition of existing extracellular Ca2+, the concentration of Ca2+ in tumor cells exposed to the steep pulse of 150 V did not change; the concentration of Ca2+ in tumor cells exposed to the steep pulse of 200 V decreased little; the concentration of Ca2+ in tumor cells exposed to the steep pulse of 250 V reduced little, too. Maybe the change of calcium burst in the tumor cells is the mechanism of apoptosis when cells are exposed to the steep pulse.
Apoptosis ; radiation effects ; Calcium ; metabolism ; Electricity ; Electromagnetic Fields ; Hepatocytes ; cytology ; pathology ; Humans ; Liver Neoplasms ; metabolism ; pathology ; Microscopy, Confocal ; Tumor Cells, Cultured

OBJECTIVE: To explore the association of VEGFR2 gene polymorphisms (rs2305948 and rs1870377) with the effect of levodopa (L-dopa) and dyskinesia in Chinese population and to provide theoretical basis for clinical treatment.
 METHODS: By using Taqman MGB analysis and gene sequencing, the rs2305948 and rs1870377 polymorphisms of 69 enrolled Parkinson's disease (PD) patients were detected. Among them, 32 cases developed dyskinesia during 5 years and 37 cases did not develop dyskinesia during 8 years (as the control).
 RESULTS: There was no significant association between the occurrence of dyskinesia and VEGFR2 polymorphisms at rs2305948 and rs1870377. However, rs1870377 polymorphism of AA showed greater maximum L-dopa dose [(565.00±163.55) mg/d vs (396.88±200.39) mg/d, (300.00±80.18) mg/d, P=0.038] and higher value of Modified Abnormal Involuntary Movement Scale (mAIMS) compared with that with polymorphisms of AT and TT [17.00±5.24 vs 8.94±6.53, 7.86±4.45, P=0.026]. 
 CONCLUSION VEGFR2 genes polymorphism (rs1870377) is associated with maximum L-dopa dose and mAIMS value in PD patients.
Antiparkinson Agents ; pharmacology ; Humans ; Levodopa ; pharmacology ; Parkinson Disease ; drug therapy ; genetics ; Polymorphism, Genetic ; Vascular Endothelial Growth Factor Receptor-2 ; genetics

Objective:To investigate the risk factors for the occurrence and poor in-hospital prognosis in patients with peripartum cardiomyopathy (PPCM).Methods:The clinical data of 35 patients with PPCM and 35 healthy pregnant women in Xuanwu Hospital, Capital Medical University and Beijing Friendship Hospital Affiliated to Capital Medical University from January 2003 to January 2022 were retrospectively analyzed. The personal histories, laboratory examination, imaging examination, cardiac function outcome, etc were collected. According to the left ventricular ejection fraction (LVEF) at discharge, the patients with PPCM were divided into in-hospital recovery group (LVEF≥50%, 18 cases) and prolonged disease group (LVEF<50%, 17 cases). Multivariate Logistic regression analysis was used to analyze independent risk factors of poor in-hospital prognosis in patients with PPCM.Results:Among 35 patients with PPCM, the age was (29.81 ± 5.37) years old, 17 cases (48.57%) complicated with gestational hypertension, 6 cases (17.14%) complicated with gestational diabetes mellitus, 24 cases (68.57%) of New York Heart Association (NYHA) cardiac function classification was Ⅲ to Ⅳ class, and 4 cases died (11.43%). The gestational age in patients with PPCM was significantly shorter than that in healthy pregnant women: (36.26 ± 4.27) weeks vs. (38.54 ± 4.59) weeks, the rates of multiple pregnancy and gestational hypertension were significantly higher than those in healthy pregnant women: 17.14% (6/35) vs. 2.86% (1/35) and 48.57% (17/35) vs. 11.43% (4/35), and there were statistical differences ( P<0.05 or <0.01). Compared with hospital recovery group, the patients in protracted disease group had shorter gestational age, larger left ventricular end-diastolic diameter, higher serum creatinine, C-reactive protein and amino-terminal pro-brain natriuretic peptide (NT-proBNP), worse NYHA cardiac function classification, and there were statistical differences ( P<0.05 or <0.01); but there were no statistical difference in LVEF at the first diagnosis and troponin I between two groups ( P>0.05). Multivariate Logistic regression analysis result showed that elevated creatinine was an independent risk factor for poor in-hospital prognosis in patients with PPCM ( OR = 4.554, 95% CI 1.536 to 13.684, P = 0.018). Conclusions:The gestational hypertension may be a risk factor for PPCM. The gestational hypertension, earlier onset time, enlarged left ventricular end-diastolic diameter, high NT-proBNP, high C-reactive protein, high creatinine and high cardiac function NYHA classification may be risk factors for poor in-hospital prognosis in patients with PPCM; and elevated creatinine is an independent risk factor for poor in-hospital prognosis in patients with PPCM.