Biomedical subjects

Tao Wang

Publications and source records attributed to Tao Wang.

At least 163 records · Page 9Linked to original sources

PubMed2005

Volume control in diabetic and nondiabetic peritoneal dialysis patients.

UNLABELLED: Diabetic patients especially the elderly have higher mortality on peritoneal dialysis treatment as compared to nondiabetic patients. As fluid overload is an important contributor for the high dropout rate in peritoneal dialysis therapy, the present study tried to compare the fluid status in diabetic and non-diabetic peritoneal dialysis patients and to investigate the effect of salt and water restriction on fluid status in diabetic peritoneal dialysis patients. METHODS: A cross sectional study was performed in 58 peritoneal dialysis patients who had been treated for at least 3 months. Among them, 20 patients were diabetics and the others were nondiabetics. We reviewed their dialysis prescription, peritoneal ultrafiltration, urine volume and fluid status. Then the 20 diabetic patients were advised to restrict their salt and water intake and were followed for 3 months. RESULTS: During the cross sectional study there were no significant differences in age, gender, height and urine volume between the diabetic and nondiabetic patients. However, body weight, normalized extracellular water (nECW), dialysis dose, dialysate glucose load, peritoneal ultrafiltration, total fluid removal and the prevalence and extent of edema were all significantly higher in diabetics as compared to nondiabetics. After restricting salt and water intake, body weight, nECW, edema, fasting blood glucose, dialysate dose, dialysate glucose load, peritoneal ultrafiltration and total fluid removal were all significantly decreased, whereas the urine volume did not change significantly. CONCLUSIONS: The present study suggests that diabetic patients were more fluid overloaded as compared to nondiabetics despite use of more hypertonic glucose solutions and, as a consequence, higher peritoneal ultrafiltration and higher total fluid removal; this indicates that our diabetic patients must have had significantly higher salt and fluid intakes. It also suggests that restricting salt and water intake can effectively treat fluid overload in diabetic peritoneal dialysis patients. Dietary salt and fluid restriction may help reduce the use of hypertonic glucose solution and thus facilitate the blood glucose control in diabetic patients undergoing peritoneal dialysis.

Adult↗

PubMed2005

Dissociation between the correlation of peritoneal and urine Kt/V with sodium and fluid removal: a possible explanation of their difference on patient survival.

BACKGROUND: It has been shown that residual renal function but not peritoneal clearance predicted patients' survival in peritoneal dialysis therapy. In the present study, we tried to explore the potential causes resulting in the difference between residual renal function and peritoneal dialysis in continuous ambulatory peritoneal dialysis (CAPD) patients. METHODS: A cross sectional study was performed during July and August 2003 to evaluate the dialysis adequacy in CAPD patients who were clinically stable and had daily urinary volume more than 100 ml. RESULTS: A total of 45 patients (male 27 and female 18) with an average ( +/- SD) age of 61.76 +/- 13.27 years were included in this study. The daily urinary volume and dialysate ultrafiltration volume were 570.33 +/- 395.47 ml and 726.09 +/- 454.01 ml, respectively. Peritoneal urea clearance (Kt/V) correlated significantly with the drained daily dialysate volume (r = 0.362, P < 0.01), but not with peritoneal net fluid removal (ultrafiltration) (r = 0.232, P > 0.05) and sodium removal (r = 0.139, P > 0.05). On the other hand, there were strong positive correlations between residual renal Kt/V and daily urine volume (r = 0.802, P < 0.001), as well as between residual renal Kt/V and urinary sodium removal (r = 0.670, P < 0.001). CONCLUSIONS: High residual renal Kt/Vurea represents both higher solute clearance and higher sodium and fluid removal, but higher peritoneal Kt/Vurea is not necessarily associated with better sodium and fluid removal. This dissociation might explain the differences on the survival of patients and peritoneal clearances.

Adult↗

PubMed2005

Modulation of surface charge, particle size and morphological properties of chitosan-TPP nanoparticles intended for gene delivery.

This work investigates the polyanion initiated gelation process in fabricating chitosan-TPP (tripolyphosphate) nanoparticles in the size range of 100-250 nm intended to be used as carriers for the delivery of gene or protein macromolecules. It demonstrates that ionic gelation of cationic chitosan molecules offers a flexible and easily controllable process for systematically and predictably manipulating particle size and surface charge which are important properties in determining gene transfection efficacy if the nanoparticles are used as non-viral vectors for gene delivery, or as delivery carriers for protein molecules. Variations in chitosan molecular weight, chitosan concentration, chitosan to TPP weight ratio and solution pH value were examined systematically for their effects on nanoparticle size, intensity of surface charge, and tendency of particle aggregation so as to enable speedy fabrication of chitosan nanoparticles with predetermined properties. The chitosan-TPP nanoparticles exhibited a high positive surface charge across a wide pH range, and the isoelectric point (IEP) of the nanoparticles was found to be at pH 9.0. Detailed imaging analysis of the particle morphology revealed that the nanoparticles possess typical shapes of polyhedrons (e.g., pentagon and hexagon), indicating a similar crystallisation mechanism during the particle formation and growth process. This study demonstrates that systematic design and modulation of the surface charge and particle size of chitosan-TPP nanoparticles can be readily achieved with the right control of critical processing parameters, especially the chitosan to TPP weight ratio.

Animals↗

PubMed2005

A low-protein diet does not necessarily lead to malnutrition in peritoneal dialysis patients.

BACKGROUND: The Dialysis Outcomes Quality Initiative (DOQI) group guideline recommends that the dietary protein intake (DPI) for peritoneal dialysis patients should be more than 1.2 g/kg/d. However, this target is not realistic for many Chinese peritoneal dialysis patients. In the present study, we investigated the impact of a low-protein diet on patients' nutritional status in a longitudinal cohort study in peritoneal dialysis patients. METHODS: Forty-seven peritoneal dialysis patients who had been on peritoneal dialysis for at least 3 months by the end of 2002 were included in the present study. All of the patients were followed up for 1 year. The patients were asked to collect their 3-day dietary record once every 3 months, and dialysis adequacy was evaluated once every 6 months. Subjective global assessment was performed at the beginning and by the end of the study. Comorbidities occurring during the follow-up were recorded. Fluid status was assessed once every 3 months. Patients were divided into three groups, with patients having a consistent DPI > or = 0.8 g/kg/d in group 1, patients with a variable DPI in group 2, and patients with a consistent DPI < 0.8 g/kg/d in group 3. RESULTS: There were 12, 18, and 17 patients in groups 1, 2, and 3, respectively. At the beginning of the study, 53.2% of the patients were malnourished. During the follow-up, nutritional status had improved in 12 patients, did not change in 32 patients, and had worsened in 3 patients. By the end of the follow-up, 34% of the patients were malnourished with only one severely malnourished patient. Malnourished patients by the end of the study had a significantly higher incidence of new comorbidities, more inflammation, and a higher incidence of fluid overload. There were no significant differences in the dialysis adequacy index among the three groups. CONCLUSIONS: Our study suggests that (1) many Chinese peritoneal dialysis patients did not achieve a high protein intake as recommended by the DOQI, but the low-protein diet does not necessarily lead to malnutrition in these patients, and (2) comorbidities occurring during the follow-up and volume overload may be the important risk factors for malnutrition in peritoneal dialysis patients.

Adult↗

PubMed2005

Strong association between volume status and nutritional status in peritoneal dialysis patients.

BACKGROUND: Malnutrition is a strong predictor of mortality in maintenance peritoneal dialysis (PD) patients. Various factors have been identified to contribute to the development of malnutrition. The present study tried to investigate the possible role of fluid overload in the development of malnutrition. METHODS: Twenty-eight PD patients were included in this study. Fluid status was evaluated by means of repeated bioimpedance analysis, and nutritional status was assessed by means of handgrip strength and subjective global assessment. All patients were followed up closely for 9 months. Based on changes in bioimpedance analysis data, patients were divided into group A (with continuous and steadily improved fluid status; n = 18) and group B (with consistent fluid overload; n = 10). RESULTS: There were no differences in sex, age, and height between the 2 groups. In group A, patients' extracellular water (ECW) volume decreased significantly during follow-up, whereas intracellular water (ICW) volume increased significantly (both P < 0.001). In group B, ECW volume increased significantly, whereas ICW volume increased at an early stage and then decreased. The ratio of ECW to total-body water decreased significantly in group A, but increased significantly in group B. Along with the improvement in fluid status, nutritional status in group A also improved significantly (the prevalence of malnutrition decreased from 66.7% to 11.1%; P < 0.01). However, in group B, nutritional status deteriorated significantly (handgrip strength decreased from 238.33 +/- 88.93 to 216.1 +/- 86.19 N; P < 0.05; and the prevalence of malnutrition increased from 40% to 50%). CONCLUSION: Our data suggest there is a strong association between fluid status and nutritional status. Improved fluid status is associated with improvement in nutritional status, whereas deterioration in fluid status is associated with the development of malnutrition.

Adult↗

PubMed2005

Effects of urinary prothrombin fragment 1 in the formation of calcium oxalate calculus.

PURPOSE: We investigated the effects of urinary prothrombin fragment 1 in the formation of calcium oxalate urolithiasis. MATERIALS AND METHODS: Fresh urine and renal parenchyma from patients with calcium oxalate calculus and normal controls were collected. Urinary prothrombin fragment 1 was isolated and purified from urine. It was identified by sodium dodecyl sulfide-polyacrylamide gel electrophoresis and analysis of its first 13 N-amino acids. The inhibitory activity of urinary prothrombin fragment 1 on calcium oxalate crystal growth was tested by the seeded crystallization technique. Meanwhile, the gamma-carboxyglutamic acid composition of urinary prothrombin fragment 1 was analyzed by a previously described method and genetic mutation of the gamma-carboxyglutamic acid domain of urinary prothrombin fragment 1 from renal parenchyma was detected by polymerase chain reaction-single strand conformational polymorphism sequencing. RESULTS: The gamma-carboxyglutamic acid composition of urinary prothrombin fragment 1 was significantly decreased from normal (24.4 to 1.7 mol/1,000 amino acids) in patients with calcium oxalate calculus. The mean growth index +/- SD of urinary prothrombin fragment 1 to calcium oxalate crystals was 42.3 +/- 4.2 compared with the normal index of 19.2 +/- 2.8 (p <0.01). The polymerase chain reaction-single strand conformational polymorphism sequencing technique revealed no genetic mutation of the gamma-carboxyglutamic acid domain of urinary prothrombin fragment 1 in patients with calcium oxalate calculus. CONCLUSIONS: The gamma-carboxyglutamic acid composition of urinary prothrombin fragment 1 as well as its ability to inhibit calcium oxalate crystal growth was significantly decreased in patients with calcium oxalate calculus. This was not caused by genetic mutation of the gamma-carboxyglutamic acid domain of urinary prothrombin fragment 1. It is important to elucidate the mechanisms of calcium oxalate stones in view of urinary prothrombin fragment 1.

1-Carboxyglutamic Acid↗

PubMed2005

Comparative phenotypic and CARD15 mutational analysis among African American, Hispanic, and White children with Crohn's disease.

BACKGROUND: Despite a large body of literature on the subject of Crohn's disease (CD), very little information is available on racial/ethnic differences related to disease presentation, clinical course, and genetics. The first identified CD susceptibility gene, CARD15, seems to be present in up to 40% of white children with CD. However, the frequency of this gene among patients with CD of other racial/ethnic groups in the United States is not known. METHODS: We conducted a multicenter study on African American and Hispanic children with CD to describe the phenotypic and genotypic (CARD15) features in comparison with white children with CD. We also analyzed the frequency of CARD15 mutations in large control samples from white, African American, and Hispanic children. RESULTS: The disease location and behavior were similar among all 3 groups, with inflammatory behavior and the ileocolonic location being the most frequent phenotype. However, significantly lower frequencies of CARD15 mutations were seen in African American (P < 0.0001) and Hispanic (P < 0.0001) children with CD compared with white children with CD. This lower CARD15 frequency among African American patients with CD was also mirrored in the general population. CONCLUSIONS: Phenotypic features of CD are similar among African American and Hispanic children compared with white children. CARD15 mutations are not increased among African American and Hispanic children with CD. CARD15 mutational frequencies among African American and Hispanic children within the general population are lower compared with white children within the general population. Future genetics studies will be required to determine the relationships between genotype and CD phenotype in various ethnic and racial groups.

Adolescent↗

PubMed2005

Enhanced sympathetic control of renal function in rats congenic for the hypertension-related region on chromosome 1.

Recent studies suggest that a quantitative trait locus (QTL) for blood pressure (BP) on rat chromosome 1 is associated with exaggerated sympathetic nervous activity. The aim of the present study was to examine whether this QTL can affect BP by altering sympathetic control of renal function. Male stroke-prone spontaneously hypertensive rats of Izumo origin (SHRSP/Izm), Wistar-Kyoto rats (WKY/Izm) and rats from a WKY/Izm congenic strain that contains an SHRSP/Izm chromosomal segment between D1Wox29 and D1Arb21 (WKYpch1.0) were used. Clearance and micropuncture experiments were performed in anaesthetized rats after acute unilateral renal denervation (DN). Mean BP in sham-operated WKYpch1.0 was significantly higher than that in WKY/Izm. The DN procedure elicited a greater reduction in renal noradrenaline levels in SHRSP/Izm and WKYpch1.0 than in WKY/Izm. In both SHRSP/Izm and WKYpch1.0, DN decreased renal vascular resistance and filtration fraction, whereas it increased renal blood flow and urinary and fractional excretion of sodium. Unilateral renal denervation did not affect these parameters in WKY/Izm. Unilateral renal denervation decreased the tubuloglomerular feedback (TGF) responsiveness only in SHRSP/Izm, whereas it increased the non-perfused early proximal flow rate in SHRSP/Izm and WKYpch1.0. The results of the present study indicate that the renal sympathetic nervous system exerts enhanced tonic control of the renal vasculature and tubular function in SHRSP/Izm and WKYpch1.0, but not in WKY/Izm. Neural impact on the TGF response in WKYpch1.0 is indiscernible. Thus, a gene or genes in the QTL may influence BP, at least in part, through renal vasoconstriction and sodium retention mediated by the enhanced activity of the renal sympathetic nerves.

Animals↗

PubMed2005

Assessment of penetrance and expressivity of RNAi-mediated silencing of the Arabidopsis phytoene desaturase gene.

RNA interference (RNAi) is of great value in plant functional genomics. However, the absence of RNAi phenotypes and the lack of uniform level of RNAi silencing has complicated gene identification. Here, the penetrance and expressivity of RNAi-mediated silencing of the phytoene desaturase (PDS) gene in Arabidopsis thaliana were examined quantitatively to provide a reference for the likely severity and distribution of silencing effects. Arabidopsis plants were transformed with an RNAi construct targeting PDS. Transgenic plants were examined for frequency of RNAi-mediated silencing and various silencing phenotypes. mRNA depletion level and RNAi expressivity were assayed by relative reverse transcription polymerase chain reaction (RT-PCR). High penetrance and variable expressivity of RNAi were demonstrated. An inverse correlation between PDS mRNA level and RNAi phenotype was seen. No direct relationship between copy number for the RNAi-generating transgene and phenotype was evident. Decreased RNAi penetrance in T2 plants was observed. It is suggested that variability in RNAi expressivity and postmeiotic decrease in RNAi penetrance constitute barriers for high throughput plant gene characterization.

Arabidopsis↗

PubMed2005

Bioactive constituents from Chinese natural medicines. XV. Inhibitory effect on aldose reductase and structures of Saussureosides A and B from Saussurea medusa.

The 80% aqueous acetone extract from the whole plant of Saussurea medusa MAXIM. was found to inhibit rat lens aldose reductase (IC50=1.4 microg/ml). From this extract, flavonoids, lignans, and quinic acid derivatives were isolated together with two new ionone glycosides, saussureosides A and B. Their absolute stereostructures were elucidated on the basis of chemical and physicochemical evidence including the application of modified Mosher's method. In addition, some isolates were found to show an inhibitory effect on aldose reductase.

Aldehyde Reductase↗

PubMed2005

Involvement of peroxiredoxin I in protecting cells from radiation-induced death.

Peroxiredoxin I (Prx-I), a key member of the peroxiredoxin family, reduces peroxides and equivalents through the thioredoxin system. Our previous work has shown that expression of Prx-I in mammalian cells increases following ionizing radiation (IR), indicating that Prx-I actively responds to IR-induced reactive oxygen species (ROS) and suggesting that Prx-I plays an important role in protecting cells from IR-induced death. To test this hypothesis, we suppressed the expression of Prx-I in SW480 cells by RNA interference. Our results show that IR induces the expression of Prx-I in SW480 cells in a dose- and time-dependent manner. The recombinant siRNA vector targeting Prx-I dramatically reduced the expression of Prx-I in SW480 cells. When Prx-I was knocked down in SW480 cells, the cells exhibited a decreased growth rate, a reduced antioxidant capability following IR and became more sensitive to IR-induced apoptosis. Together, our results demonstrate that Prx-I plays an important role in protecting cells from IR-induced cell death, which might be through scavenging IR-induced ROS in the cells.

Apoptosis↗

PubMed2005

Effects of vasopeptidase inhibition on renal function and tubuloglomerular feedback in spontaneously hypertensive rats.

Vasopeptidase inhibitors are a novel class of antihypertensive agents that concomitantly inhibit angiotensin converting enzyme and neutral endopeptidase. Our purpose was to investigate the effects of omapatrilat, a vasopeptidase inhibitor, on renal function and tubuloglomerular feedback (TGF) response in anesthetized 9-10-week-old spontaneously hypertensive rats (SHR). Intravenous injection of omapatrilat at 10 micromol/kg decreased systemic blood pressure and renal vascular resistance. Renal plasma flow was unchanged, whereas glomerular filtration rate (GFR) and filtration fraction (FF) were reduced. Increased urinary sodium excretion of tubular origin was observed. These parameters remained unaltered with vehicle treatment. Micropuncture study revealed that the maximal reduction of early proximal flow rate (EPFR) induced by orthograde perfusion of Henle's loop with artificial tubular fluid (ATF) was significantly reduced by omapatrilat treatment (28.5+/-3.1% vs. 72.0+/-2.8% of control) and was not significantly changed in the vehicle-treated group (vehicle 70.8+/-1.7% vs. control 71.0+/-2.1%). EPFR at zero perfusion was comparable between omapatrilat and vehicle treatment (29.7+/-2.2 vs. 31.3+/-2.1 nl/min, respectively). Luminal perfusion of 10(-4) mol/l 7-nitroindazole in ATF abrogated the blunting of TGF response by omapatrilat but elicited no change in the vehicle-treated group. The suppression of the TGF mechanism and the reduction in FF suggest that omapatrilat respectively dilates the afferent and efferent arterioles. Under such conditions, reduction of GFR may indicate a fall in intraglomerular pressure. The restoration of nitric oxide signaling in the juxtaglomerular apparatus of SHR seems to participate in the inhibition of TGF by omapatrilat. These findings suggest that omapatrilat may provide a novel approach to the treatment of systemic and glomerular hypertension.

Animals↗

PubMed2005

Developments in antiviral drug design, discovery and development in 2004.

This article summarizes key aspects of progress made during 2004 toward the design, discovery and development of antiviral agents for clinical use. Important developments in the identification, characterization and clinical utility of inhibitors of human immunodeficiency virus; the hepatitis viruses, hepatitis B, hepatitis C; the herpes family of viruses, herpes simplex viruses 1 and 2, varicella zoster virus, Epstein-Barr virus and human cytomegalovirus; the respiratory viruses, influenza, respiratory syncytial virus, human metapneumovirus, picornaviruses, measles and the severe acute respiratory syndrome coronavirus; human papilloma virus; rotavirus; Ebola virus and West Nile virus, are reviewed.

Amino Acid Sequence↗

PubMed2005

Co-expression and immunity of Legionella pneumophila mip gene and immunoadjuvant ctxB gene.

The mip gene of Legionella pneumophila and the ctxB gene of Vibrio cholerae were amplified by PCR respectively. The amplified cDNA was ligated to the pcDNA3.1(+) vector. The recombinant plasmids pcDNA3.1-mip and pcDNA3.1-ctxB were identified by restriction analysis and PCR, and further confirmed by sequencing analysis. NIH3T3 cells were transfected with pcDNA3.1-mip and pcDNA3.1-ctxB according to the Lipofection method. Transient and stable products of the co-expression of the mip gene and ctxB gene were detected by immunofluorescence and Western blotting. The results showed that NIH3T3 cells were successfully transfected, and that the transiently and stably co-expressed products can be detected in the transfected cells. To detect the humoral and cellular immune response in immunized mice induced by the co-mmunization of the mip and ctxB genes, female BALB/c mice were immunized intramuscularly with pcDNA3.1-mip and pcDNA3.1-ctxB. The results showed that the specific antibody titer and the cytotoxic T-lymphocyte response for pcDNA3.1-mip immunization and co-immunization were increased compared with that of pcDNA3.1(+) immunization. Furthermore, the specific antibody titer and cytotoxic T-lymphocyte response for co-immunization were increased compared with that of pcDNA3.1-mip immunization. Statistical analysis using one-way analysis of variance (ANOVA) showed that there was a significant difference between the groups (P<0.01). The results indicated that the ctxB gene enhanced the humoral and cellular immune response to the mip gene immunization. These findings provide experimental evidence to support the development of the L. pneumophila DNA vaccine.

Adjuvants, Immunologic↗

PubMed2005

[Relation of dose intensity and efficacy, toxicity in paclitaxel as a single agent for advanced breast cancer].

OBJECTIVE: To evaluate the relation of dose intensity and efficacy, toxicity in advanced breast cancer treated with paclitaxel as a single agent. METHODS: Seventy-one patients with advanced breast cancer received paclitaxel as a single agent with different dose intensities. According to the phase I or phase II trial, the standard dose intensity of paclitaxel was defined as 58.3 mg.(m(2))(-1).week(-1). The dose of paclitaxel was 175 mg/m(2) given every three weeks, ranging 33.3 - 70.3 mg.(m(2))(-1).week(-1) [median delivered dose intensity 58.82 mg.(m(2))(-1).week(-1)]. Efficacy and toxicity was evaluated. RESULTS: The overall response rate in this group of advanced breast cancer was 40.8%. Responses were seen in lungs, soft tissue, bone and liver, with the response rates of 52.0%, 38.0%, 12.5%, 7.7%, respectively. When the relative dose intensity (RDI) was > 1.0, 0.9 - 1.0, < 0.9, the response rates were 44.2%, 47.6%, 0, respectively. The difference between the group (RDI >/= 0.9% - 1.0%) in 7 patients and the group (RDI < 0.9) was significant (P < 0.05). Toxicity was well tolerated, with the efficacy decreased as soon as the RDI had been reduced without embarrassing the toxicity. CONCLUSION: Paclitaxel as a single agent therapy with standard dose intensity is effective and well tolerated by patients with advanced breast cancer.

Adult↗

PubMed2005

[A study on the chondrogenesis of the compound of alginate gelatin and bone marrow stromal cells in vivo].

OBJECTIVE: To investigate the chondrogenisis by alginate gelatin and rats' bone marrow stromal cells (BMSCs) chondrogenicly induced in vitro. METHODS: Thirty-two male adult SD rats were assigned randomly to experimental and control groups. In experimental group, bone marrow was obtained from the right tibias of all the rats. After expanding and culturing 3 passages, induced BMSCs by chondrogenic culture medium for 10 days. Suspended induced cells in alginate gelatin, and injected the complex into the hypodermic tissue of the backs of rats autogenously. In control group only alginate gelatins were injected. The grafts were taken out for examinations 4 and 8 weeks after the operations. RESULTS: Considerable cartilage appeared in experimental group 8 weeks after operations. Regular HE staining and alcian blue staining showed a great deal of cartilage holding chondrocyte masses surrounded by abundant matrix. Alginate gelatin decompounded obviously, and the rest distributed among newly formed cartilage. No cartilage appeared in control group all through. CONCLUSION: BMSCs and alginate gelatin have a beautiful future in cartilage tissue engineering.

Alginates↗

PubMed2005

[Relationship between the acquired multi-drug resistance of human large cell lung cancer cell line NCI-H460 by cisplatin selection and p53 mutation].

OBJECTIVE: To explore the role of p53 mutation in the development of acquired multi-drug resistance during lung cancer chemotherapy. METHODS: A resistance large cell lung carcinoma cell line (H460/DDP) was established by high dose (50 micromol/L) cisplatin intermittent selection from its parental cell NCI-H460 that had wild type p53 (wtp53). Several multi-drug resistant proteins (MRP) including lung relative protein (LRP), P-gp, MRP, glutathione transferase-pi, topoisomerase II and P53 were checked by immunocytochemistry. Immunofluorescence was used to check the phosphoration of P53. p53 cDNA was amplified and sequenced. The H460/DDP cells were transected with plasmid pShuttle-CMV-wtp53 cDNA and measurement of drug sensitivity was performed after transfection. RESULTS: The resistance index to cisplatin and carboplatin in H460/DDP cell line was 10.21 and 9.98 respectively, and the cell line also exhibited cross-resistance to 5-fluorouracil, etoposide, methotrexate, adriamycin, epirubicin, bleomycin and novantrone, except for taxol. It was found that P53 protein translocated from nuclear to cytoplasm and could not phosphorate after the stimulation of cisplatin. LRP was expressed increasingly and other proteins showed insignificant changes. Sequencing showed an important insertion "t" after 277 bp on the gene level. H460/DDP cells transfected with plasmid pShuttle-CMV-wtp53 cDNA reversed partly (53.2%) the resistance to cisplatin/carboplatin, compared to the H460/DDP cells transfected with blank vector. CONCLUSIONS: p53 mutation induced by cisplatin/carboplatin might play an important role in the development of acquired multi-drug resistance of lung cancer chemotherapy. wtp53 substitute therapy during chemotherapy may be an effective method to overcome the acquired drug resistance.

ATP Binding Cassette Transporter, Subfamily B, Mem↗

PubMed2005

[Selection of peritoneal dialysis schemes based on multi-objective fuzzy pattern recognition].

The fuzziness in the selection of peritoneal dialysis schemes is discussed. A method of multi-objective fuzzy pattern recognition and its application in the selection of peritoneal dialysis schemes are presented. The method was first applied to the field of peritoneal dialysis. The conclusion showed that this method agreed with doctors' opinions. It provides a new idea for research in this field. At the same time, since the method is simple and easy to use, it can be of wide application.

Fuzzy Logic↗