ABSTRACT
Polysaccharide from Ganoderma applanatum has the activities of anti-tumor and enhancing immune function. There were no reports on antitumor effect of its intratumoral injection. In this study, the polysaccharide was extracted from G. applanatum by water extraction and alcohol precipitation, and purified by ceramic membrane after removing protein by Sevage method. The total polysaccharide content from G. applanatum(PGA)was about 63%. The combination of PGA and paclitaxel showed synergistic effect on cytotoxicity of 4 T1 cells at lower concentrations in vitro. In addition, the growth curve of 4 T1 cells showed that PGA could retard the growth of 4 T1 cells gradually. The PGA thermosensitive gel(PGA-TG)was prepared by using poloxamer 188 and 407. The gel temperature was 36 ℃, and the PGA-TG could effectively slow down the release rate of PGA in vitro. 4 T1 breast cancer-bearing mice were used as a model to evaluate the therapeutic effect of intratumoral injection of PGA combined with tail vein injection of nanoparticle albumin-bound paclitaxel(nab-PTX). In high and low dose PGA groups, each mice was given with 2.25, 1.125 mg PGA respectively, twice in total, and the dosage of paclitaxel was 15 mg·kg~(-1), once every 3 days, for a total of five times. The tumor inhibition rate was 29.65% in the high dose PGA-TG group, 58.58% in the nab-PTX group, 63.37% in low dose PGA-TG combined with nab-PTX group, and 68.10% in high dose PGA-TG combined with nab-PTX group respectively. The inhibitory effect in high dose PGA-TG group combined with nab-PTX on tumors was significantly higher than that in nab-PTX group(P<0.05). The results showed that paclitaxel therapy combined with intratumoral injection of PGA-TG could improve the therapeutic effect for 4 T1 mice and reduce the side effects of chemotherapy.
Subject(s)
Animals , Mice , Breast Neoplasms , Cell Line, Tumor , Ganoderma , Neoplasms , Paclitaxel , Poloxamer , PolysaccharidesABSTRACT
Objective: To observe the value of contrast-enhanced ultrasound (CEUS) and acoustic radiation force impulse (ARFI) elastography in evaluating efficacy of microwave ablation (MWA) on hepatic alveolar echinococcosis in rats. Methods: Totally 40 HAE rat models were divided into experimental group (n=30) and control group (n=10). Rats in experimental group underwent ultrasound-guided MWA, while those in control group received routine feeding. Routine 2D ultrasound, CEUS and ARFI were used to measure the maximum diameter of lesions before and 1 month later. The changes of mean gray scale ratio and shear wave velocity (SWV) in marginal zone of lesions in experimental group were compared with pathologic findings. Then the rats were all scarified, and routine HE staining, CD34 immunohistochemical staining and Masson staining were performed to count the microvessel density (MVD) and fibrosis area at the edge of lesions. Results: There were 19 rats (21 lesions) in experimental group and 10 rats (10 lesions) in control group. One month after MWA, the maximum diameter of lesions obtained with 2D ultrasound, CEUS and ARFI became smaller in experimental group (all P0.05). One month after MWA, the mean gray scale ratio of ablation edge in experimental group was lower, while SWV value was higher than that before (both P<0.001). MVD of the ablation edge in experimental group was lower than that in control group (P<0.001), and the fibrosis area of experimental group was higher than that of control group (P<0.001). MVD was positively correlated with the gray scale ratio at the ablation edge (r=0.541, P=0.011), and SWV was positively correlated with the fibrosis area of Masson (r=0.494, P=0.023). Conclusion: Both CEUS and ARFI had certain application value for evaluation on efficacy of microwave ablation for treatment of HAE in rat models.
ABSTRACT
<p><b>OBJECTIVE</b>To explore the molecular-epidemiology of Mycobacterium tuberculosis in Shanghai.</p><p><b>METHODS</b>Drug-resistant and drug-susceptible strains of M. tuberculosis were randomly selected from the bank of M. tuberculosis of Shanghai Municipal Center for Disease Control and Prevention and were genotyped by mycobacterial interspersed repetitive units(MIRU) and Spoligotyping methods. The genotyping results were analyzed and combined with epidemiological data.</p><p><b>RESULTS</b>The Spoligotyping results demonstrated that 89 % (81/91) of the strains belonged to the Beijing genotype. Of the patients who had received BCG-vaccination,88.5% (54/61) infected with strains of Beijing genotype and 90.0% (27/30) of the patients were not BCG-vaccinated. However, the difference was not statistically significant. Drug-resistant rate from those strains of Beijing genotype was 45.7 (37/81), lower than that of non-Beijing genotype (60.0% ,6/10). Again,the difference was not statistically significant. The MIRU results showed that 62.6 % (57/91) were strains of clusters.</p><p><b>CONCLUSION</b>The Beijing genotype of M. tuberculosis were found to be the dominant strains in Shanghai. The associations between Beijing genotype strains and BCG vaccination or drug-resistant were not found. Results from cluster analysis suggested that some cases might belong to the newly developed cases.</p>