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Biomedical subjects

B Liu

Publications and source records attributed to B Liu.

At least 181 records · Page 10Linked to original sources

Effects of nimodipine on changes of endothelin after head injury in rabbits.

OBJECTIVE: To investigate the effects of nimodipine on changes of endothelin after head injury. METHODS: Sixty-five adult rabbits were randomized into an injury group (IG, n=30), a nimodipine-treatment group (NTG, n=30) and a control group (CG, n=5). With their heads unfixed, the animals in IG and NTG were injured in the frontal-parietal zone with BIM-II bioimpact. Blood samples and brain tissue were collected before and after injury. The endothelin level was measured with RIA. RESULTS: The endothelin level in plasma and brain tissue was significantly increased 24 hours after injury. At the 8th or/and 24th hours postinjury, the endothelin level was significantly lower in NTG than that in IG. CONCLUSIONS: Nimodipine can prevent endothelin from elevation and act as a practical endothelin antagonist after head injury clinically.

Animals↗

[Multivariate analysis of prognostic factors in Philadelphia chromosome-positive chronic granulocytic leukemia].

OBJECTIVE: To investigate the prognostic factors of the patients with Philadelphia chromosome-positive chronic granulocytic leukemia (CGL). METHODS: Clinical and laboratory parameters of 209 CGL patients at diagnosis were analyzed in relation to survival. COX regression analysis were used to identify the statistically significant prognostic factors. RESULTS: The median survival time was 57 (3 - 179) months, and 5 year survival rate was 48%. From the COX regression model, the four main poor prognostic factors were as follows: percentage of bone marrow blasts (>or= 0.04), percentage of peripheral blood blasts and promyelocytes and presence of erythroid precursors in peripheral blood. According to the prognostic scores, three groups of CGL were identified. The low-risk group was with a median survival time of 76 months, the intermediate-risk group with 56 months, and the high-risk group with 31.5 months (P < 0.01). The 5 year survival rate was 70.42%, 46.30% and 18.18% (P < 0.01), respectively. CONCLUSIONS: A prognostic scoring system suitable for Chinese CGL patients was proposed.

Adolescent↗

[Observation of long-term therapeutic outcome in chronic granulocytic leukemia].

OBJECTIVE: To analyse the long-term outcome of various therapeutic protocol for the treatment of chronic granulocytic leukemia (CGL). METHODS: Median duration of chronic phase, survival and transformation of 331 CGL patients treated with different project were retrospectively analyzed. RESULT: Longer chronic phase and survival and lower percentage of transformation were found in patients using mesoindigo as maintaining treatment as compared with those using busulfan as maintaining treatment. The effect of meisoindigo and hydroxyurea showed no significant difference. These two drugs were both superior to bulsufan. Combination chemotherapy was not superior to meisoindigo, hydroxyurea or busulfan alone. Interferon had the best therapeutic effectiveness for the treatment of CGL. CONCLUSION: Busulfan was not suitable for maintaining treatment. Meisoindigo or meisoindigo combined with hydroxyurea was good choices for maintaining treatment. Meisoindigo and hydroxyurea had better effect in combination than alone. Interferon could significantly prolong the chronic period and survival period of CGL patients.

Adolescent↗

[Establishment and biologic characterization of human hepatocellular carcinoma cell line HCC-9903].

OBJECTIVE: To establish a new hepatocellular carcinoma (HCC) cell line and provide a new and ideal experimental model. METHODS: The cell line designated as HCC-9903 was derived from a surgical specimen of HCC. After primary culture, its biologic characteristics were studied under light and electron microscope and by determination of doubling time and growth curve, culture in soft agar, flow cytometry(FCM), chromosome analysis, detection of AFP, HBV and telomerase, agglutination test of concanavalin (ConA) as well as inoculation in nude mice. RESULTS: The first passage was found on the 29th day. Morphological study demonstrated its malignant characteristics. Chromosome analysis revealed a chromosome number ranging from 49 to 135, with a model number of 52 to 67. Aberrant chromosomes 1 q(i) and t (6,11) were its chromosome markers. The cell line produced tumors after subcutaneous transplantation into nude mice. CONCLUSION: According to the rules of establishing a cell line in vitro, HCC-9903 has been proved to be a new cell line of human HCC carcinoma, and more experimental methods have been used to study its biological characteristics.

Animals↗

[Studies on antiviral flavonoids in yinqiaosan powder].

OBJECTIVE: To study the chemical constituents in Yinqiaosan Powder that have antiviral action on influenza. METHOD: Isolation of the constituents by different kinds of column chromatography and elucidation of their structures by chemical and spectral methods. RESULTS: Seven flavonoids were obtained, and six of them were identified as linarin, acacetin, hesperidin, isoquiritigenin, isoquiritin and hyperoside respectively. CONCLUSION: Linarin and acacetin were isolated from Yinqiaosan Powder for the first time.

Antiviral Agents↗

[Study on the content of serum HDL subclasses in obese subjects].

OBJECTIVE: To investigate the change of the contents of serum HDL subclasses in obese subjects. METHODS: Contents of serum HDL subclasses in healthy controls(n = 64) and obese subjects(n = 58) were determined by two-dimensional gel electrophoresis associated with immunodetection method. RESULTS: The pre-beta 1 HDL, HDL3c and HDL3b contents increased significantly (P < 0.001) and the HDL2b content decreased significantly (P < 0.001) in obese subjects as compared with those in healthy controls. In male obese subjects, the pre-beta 1 HDL and HDL3c levels were significantly higher(P < 0.01 and P < 0.05, respectively) and HDL2b level was significantly lower(P < 0.05), compared with those in female obese subjects. In male control subjects, the level of pre-beta 1 HDL was significantly higher than that in female subjects. In obese subjects, the concentrations of BMI and serum TG had positive correlation with those of pre-beta 1 HDL(r = 0.382, P < 0.001), HDL3c(r = 0.232, P < 0.05) and HDL3b(r = 0.294, P < 0.01) and negative correlation with that of HDL2b(r = -0.304, P < 0.01). CONCLUSION: The particle size of HDL in obese subjects showed a general shift toward smaller size, which indicated that the maturation of HDL could be abnormal in obese subjects. The particle size of HDL was found to be smaller in both obese and control male subjects than in female subjects, suggesting that sex seems to be related to the contents of serum HDL subclasses.

Adult↗

[The effect of ketamine on the expression of HSP70 induced by endotoxin in liver of rat].

OBJECTIVE: To observe the effect of ketamine on the expression of heat shock proteins (HSP70) in liver of rat with septic shock. METHODS: Sixty-four rats were randomly allocated to control group, endotoxin group and ketamine group. The model of septic shock was used to examine the expression of HSP70 in rat liver and the TNF-alpha level of blood at 2 hours after endotoxin treatment and dying time for endotoxin group rats. The survival rates for the three groups were compared. RESULTS: There was a significant increase in the expression of HSP70 and the level of TNF-alpha in the endotoxin group as compared with those of control group (P < 0.05). A significant increase in the expression of HSP70, a decrease in the level of TNF-alpha and a significantly higher survival rate were seen in ketamine group when compared with those of endotoxin group, respectively. CONCLUSION: Ketamine could increase the expression of HSP70 in rat liver, restrain the release of TNF-alpha caused by endotoxin, and raise the survival rates of rats with septic shock.

Animals↗

[Relation of plasma glucose levels to serum lipids and apolipoproteins levels in middle and old age males].

OBJECTIVE: To gain an insight into the relation of plasma glucose levels to lipids and apolipoproteins levels. METHODS: Fasting 12-14 h blood glucose (BG), high density lipoprotein cholestrol(LDL-C), apolipoproteins(apo) A I, A II, B100, C II, C III and E levels were measured in 735 men aged 40-70 in Chengdu area. The subjects studied were divided into three groups by the plasma glucose levels: 1. normal group (S1), 2. decreased glucose tolerance group (S2), 3. diabetes mellitus (DM) group (S3). RESULTS: Among 735 cases studied, groups S2 and S3 had more hyperlipidemia than group S1 (64%, 45% and 32.2% respectively). The fasting serum mean TG levels in groups S2 (3.62 +/- 2.52 mmol/L) and S3 (4.45 +/- 3.82 mmol/L) group were significantly higher than that in group S1 (1.92 +/- 1.39 mmol/L) (P < 0.01 and P < 0.01), and the mean TG levels in groups S2 (5.68 +/- 1.15 mmol/L) and S3 (5.68 +/- 1.12 mmol/L) were higher than that in group S1 (5.13 +/- 1.06 mmol/L) (P < 0.05, P < 0.05). The serum apo B100, C II, C III and E levels in groups S2 and S3 were significantly higher as compared with that in the normal group (P < 0.01, P < 0.05). The correlation analysis indicated that there was a positive correlation of BG with serum TG in groups S1, S2 and S3 whose correlation coefficients (r) were 0.1800, 0.1436 and 0.3212 respectively (P < 0.001); and a negative correlation with HDL-C levels in groups S2 and S3 (r = -0.2534 and -0.1477, P < 0.001). The plasma glucose levels were positively correlated with apo B100, C III and E levels in groups S1, S2 and S3, P < 0.001), with apo C II in groups S1 and S2 (P < 0.001, P < 0.01); and negatively correlate to apoA I only in group S2 (r = -0.1182, P < 0.01). CONCLUSION: The results suggest that serum TG, TC, HDL-C, apoB100, C II, C III and E levels be the main factors that related to plasma glucose levels.

Aged↗

[The paraoxonase Gln-Arg192 polymorphism in patients with coronary heart disease in Chinese population].

OBJECTIVE: To investigate the 192 Gln-Arg polymorphism of paraoxonase (PON) gene and its relationship with serum lipids levels in patients with coronary heart disease in Chinese population. METHODS: The genotype and allele frequency of paraoxonase gene 192 Gln-Arg polymorphism was assayed by polymerase chain reaction (PCR)-restriction fragment length polymorphism (RFLP). Serum lipids were measured by enzymatic kits in 118 CHD patients and 128 healthy subjects whose fasting serum TG levels were < 1.82 mmol/L and TC levels < 6.2 mmol/L from a population of Chinese Han nationality in Chengdu area. RESULTS: Both in CHD group and control group, the QR genotype of PON gene was the major one, and its frequencies were 0.578 and 0.525 respectively. No differences were found in PON gene Gln-Arg polymophism in the CHD group when compared with the control group. The frequency of R allele of PON gene in Chinese was significant higher than that in European and American Caucasians (0.51 vs. 0.26-0.31, P < 0.01) and Indian (0.51 vs. 0.17, P < 0.01), and significantly lower than that in Japanese (0.51 vs. 0.65, P < 0.01). CONCLUSION: These results suggested that the Gln-Arg192 polymorphism of the PON1 gene was not associated with coronary heart disease in Chinese population.

Aged↗

[Serum apolipoprotein A I, B100 and E levels and apolipoprotein E polymorphism in patients with Alzheimer's disease and multiple infarction dementia in Chinese population].

OBJECTIVE: To investigate the relationship of serum apolipoprotein (apo) A I, B100 and E levels and apo E polymorphism to Alzheimer's disease (AD) and multiple infarction dementia (MID) in Chinese population. METHODS: The apoE phenotypes were assayed by isoelectric focusing and immunoblotting, and apolipoproteins were determined by radial immunodiffusion assay in 75 patients with AD, 36 patients with MID and 60 control subjects. RESULTS: The frequency of apo E4 allele (epsilon 4) was significantly higher and the frequency of epsilon 2 allele was lower in AD group, compared with those in the control group (0.2333 vs 0.0666, 0.0467 vs 0.0833, P < 0.05). The frequency of epsilon 4 allele in MID group was also higher than that in the control group (0.2083 vs 0.0666, P < 0.05). The fasting serum apoA 1 and E levels in AD and MID groups were remarkably lower than those in the control group (P < 0.001 and P < 0.05). CONCLUSION: Apo E4 allele epsilon 4 was associated with AD and MID. ApoE4 might be a risk factor for AD and MID, and apo E2 might be a protective factor for AD. The serum apo A I and apoE levels were significantly decreased in patients with Alzheimer's disease and multiple infarction dementia.

Aged↗

[Determination of paraoxonase activities in serum and HDL].

OBJECTIVE: [corrected] To establish a reliable method of determining the activity of paraoxonase(PON) in serum and high density lipoprotein(HDL). METHODS: We used phenylacetate(PA) as substrate and investigated the hydrolysis of PA catalyzed by serum PON or HDL-PON. The PON activities were calculated from the velocities of reaction that had been determined by the increasing absorbance of product p-phenol within the first 5 minutes. RESULTS: Through the studies on the effects of substrate concentration, pH, activator Ca2+, and inhibitor EDTA, we found the best conditions of reaction to be: substrate concentration 5 mmol/L, pH8.0, and Ca2+ concentration 2 mmol/L. And we established the method with good reproducibility and stability. CONCLUSION: Under the above-stated conditions, it is reliable to determine the activity of paraoxonase in serum and HDL.

Aryldialkylphosphatase↗

[Establishment and implication of an assay for high density lipoprotein phospholipids in human serum].

OBJECTIVE: To develop an assay for high density lipoprotein phospholipids in human serum based on ascorbutate reduction method. METHODS: HDLs were separated from apolipoprotein B-containing lipoproteins by precipitation of phosphotungstic acid and magnesium chloride. Phospholipids of HDL were extracted by ethanol/ether, and dried. After the dried phospholipids were digested by sulphuric acid and perchloric acid, the color was developed by adding ammonium molybdate in ascorbutate. The levels of high density lipoprotein phospholipids (HDL-PL) were measured by spectrophotometry at 700 nm. RESULTS: The coefficients of variation (CV) were 3.6% and 3.7% within two batches of assays. Recovery of isolated HDL-PL added to serum ranged from 98% to 107%, averagely 103%. The established assay for human serum HDL-PL was used to measure the serum levels of 30 hypercholesterolemic subjects, 30 hypertriglyceridemic subjects, 30 combined hyperlipidemic subjects, and 30 normolipidemic subjects. The hypertriglyceridemic subjects had lower HDL-PL level than normolipidemic subjects and hypercholesterolemic subjects (The P values are 0.005 and 0.007 respectively). CONCLUSION: A simple and specific method for assay of HDL-phos-pholipids in human serum has been developed. The above data collected by the use of this method demonstrate the closer relationship between human HDL-PL metabolism and triglyceride metabolism, suggesting that lower HDL-PL level might serve as an index in the assay for type IV hyperlipidemia.

Humans↗

[Development of a gas chromatographic column system for the on-line analysis of trace tetrahydrofuran in hexane].

A gas chromatographic system using home-made 7 microns thick cross-linked dimethylpolysiloxane columns for the on-line analysis of trace tetrahydrofuran in hexane in a rubber production facility was developed. The experimental parameters of the column system, including the temperature, flow rate as well as the back-flushing and heart-cutting program were investigated. The total column-switching program was suggested. The system has been successfully operated for more than one year with good resolution, stability and precision (RSD < 5%) in analyzing trace tetrahydrofuran (0-250 x 10(-6), V/V) for industrial process control in the rubber production facility.

Chromatography, Gas↗

[Improved retrosigmoid approach operation in the treatment of trigeminal neuralgia].

OBJECTIVE: To explore the surgical method which can raise the treatment effect and reduce the complication occurrence of cerebellopontine angle (CPA) operation by retrosigmoid approach. METHOD: Have improved the retrosigmoid approach in the skin incision, the hole position of bone, the intracranial operation skills and the duramatral suture, etc. By the improved retrosigmoid approach, we used partial sensory rhizotomy (PSR) to cure 54 cases with trigeminal neuralgia (TN). RESULT: 52 cases got satisfactory treatment effect and no complication appeared. In the other 2 cases, the trigeminal nerve was not found in CPA. CONCLUSION: The CPA operation by retrosigmoid approach is dangerous relatively, it usually can cause some serious complication. But improved retrosigmoid approach can expose CPA sufficiently and is convenient to operate. On the other hand, it can decrease intracranial unexpected hemorrhage and complication occurrence.

Adult↗

[The location of new porcine microsatellites by means of PRINS and somatic cell hybrid panel].

In this study, two new microsatellites HAU02 and HAU06, which are screened and cloned. HUA02 and HAU06 are repectively mapped in lq23-27 and 6q11-21 by means of PRINS (primed in situ labeling) and somatic cell hybrid (SCH) panel techniques, we discussed their advantage and disadvantage in gene mapping. These two means provide us more techniques in gene mapping, and the locations of these new microsatellites accumulate more resource for Porcine Physical Map.

Animals↗