Aim: Although aberrant miRNA expression has been documented, altered miR-101 expression in cervical cancer and its carcinogenic effects and mechanisms remain unexplored. The aim of our study was to investigate the role of miR-101 alteration in cervical carcinogenesis. Methods: Expression of miR-101 was examined by quantitative real-time reverse transcriptase PCR (qRT-PCR) in Hela cells. After modulating miR-101 expression using miR-101 mimics, cell growth, apoptosis and proliferation, and migration were tested separately by MTT or flow cytometry and cell wound healing assay and protein expression was detected by qRT-PCR. The expression of COX-2 in Hela cell was also examined by immunohistochemical staining and the correlation with miR-101 expression was analysed. Results: The miR-101 demonstrated significantly low expression in Hela cell. When we transfected miR-101 mimics into Hela cells, the modulation of miR-101 expression remarkably influenced cell proliferation, cycling and apoptosis: 1) The expression of microRNA-101 tended to increase after transfection; 2) Overexpression of miR-101 was able to promote cell apoptosis, the apoptosis rate being markedly higher (97.6%) than that seen pre-transfection (12.2%) (P<0.05); 3) The miR-101 negatively regulates cell migration and invasion, scratch results being lower ($42.7um{\pm}2um$) than that observed pre-transfection ($181.4um{\pm}2um$); 4) miRNA-101 inhibits the proliferation of Hela cells as well as the level of COX-2 protein, which was negatively correlated with miR-101 expression. Conclusions: Overexpression of miR-101 has obvious inhibitory effects on cell proliferation, migration and invasion. Thus reduced miR-101 expression could participate in the development of cervical cancer at least partly through loss of inhibition of target gene COX-2, which probably occurs in a relative late phase of carcinogenesis. Our data suggest an important role of miR-101 in the molecular etiology of cancer and indicate potential application of miR-101 in cancer therapy.
A cDNA of bovine brain glutamate dehydrogenase (GDH) was isolated from a cDNA library by recombinant PCR. The isolated cDNA has an open-reading frame of 1677 nucleotides, which codes for 559 amino acids. The expression of the recombinant bovine brain GDH enzyme was achieved in E. coli. BL21 (DE3) by using the pET-15b expression vector containing a T7 promoter. The recombinant GDH protein was also purified and characterized. The amino acid sequence was found 90% homologous to the human GDH. The molecular mass of the expressed GDH enzyme was estimated as 50 kDa by SDS-PAGE and Western blot using monoclonal antibodies against bovine brain GDH. The kinetic parameters of the expressed recombinant GDH enzymes were quite similar to those of the purified bovine brain GDH. The $K_m$ and $V_{max}$ values for $NAD^+$ were 0.1 mM and $1.08\;{\mu}mol/min/mg$, respectively. The catalytic activities of the recombinant GDH enzymes were inhibited by ATP in a concentration-dependent manner over the range of 10 - $100\;{\mu}M$, whereas, ADP increased the enzyme activity up to 2.3-fold. These results indicate that the recombinant-expressed bovine brain GDH that is produced has biochemical properties that are very similar to those of the purified GDH enzyme.
Background: This case-control study aimed to determine if there were any associations between the two single nucleotide polymorphisms (SNPs) in Gc, rs7041 (Asp416Glu) and rs4588 (Thr420Lys) and 3 common cancers (breast, lung and colorectal) in Thai patients. Materials and Methods: Two hundred and eighty two colorectal, 101 breast and 113 lung cancer patients were recruited from one institute during 2011-2013. The controls were age-matched volunteers who had a negative history of index cancers. In addition, vitamin D levels were compared among different genotypes in the 2 SNPs. Results: The minor allele frequencies of rs7041 (G) and rs4588 (A) were 0.32 and 0.24, respectively. Under the dominant model, the study found significant associations between minor-allele genotypes of the SNP rs7041 (TG/GG) and lung cancer (odds ratio [OR] 1.78, 95% CI 1.05-3.03). When subgroup analysis was performed according to sex and age at diagnosis, the study found that the minor-allele genotypes of rs7041 (TG/GG) were significantly associated with colorectal cancer in patients whose age at diagnosis was more than 60 years (OR 1.67, 95%CI 1.06-2.61) and the minor-allele genotypes of rs4588 (CA/AA) were significantly associated with colorectal cancer in males aged 60 years or less (OR 2.34, 95%CI 1.25-4.37). When SNP combinations (rs7041-rs4588) were examined, the TT-CA combination had a significant protective association with lung cancer (OR 0.44, 95% CI 0.22-0.85). On evaluation of serum 25(OH)D levels in 205 individuals without cancer (males 144, females 61), the proportion of subjects with low serum vitamin D (< 20 ng/ml) in those harboring CA or AA genotypes of rs4588 (41.7%) was significantly higher than the CC genotype (15.5%, p-value < 0.01). Conclusions: Genetic polymorphisms in Gc were associated with lung and colorectal cancers in Thai patients. Lower serum 25(OH)D in minor variants of rs4588 may explain this association.
Gastric cancer (GC) is one of the most common malignancies in the world. It is the first cause of cancer deaths in both sexes In Iranian population. Circulating insulin-like growth factor-one (IGF-1) levels have been associated for gastric cancer. IGF-1 protein has central roles involved in the regulation of epithelial cell growth, proliferation, transformation, apoptosis and metastasis. Single nucleotide polymorphism in IGF-1 regulatory elements may lead to alter in IGF-1expression level and GC susceptibility. The aim of this study was to investigate the influence of IGF-1 gene polymorphism (rs5742612) on risk of GC and clinicopathological features for the first time in Iranian population. In total, 241 subjects including 100 patients with GC and 141 healthy controls were recruited in our study. Genotypes were analyzed using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) assay with DNA from peripheral blood. The polymorphism was statistically analyzed to investigate the relationship with the risk of GC and clinicopathological properties. Logistic regression analysis revealed that there was no significant association between rs5742612 and the risk of GC. In addition, no significant association between genotypes and clinicopathological features was observed (p value>0.05). The frequencies of the CC, CT, and TT genotypes were 97%, 3%, and 0%, respectively, among the cases, and 97.9%, 2.1%, and 0%, respectively, among the controls. CC genotype was more frequent in cases and controls. The frequencies of C and T alleles were 98.9% and 1.1% in controls and 98.5% and 1.5% in patient respectively. Our results provide the first evidence that this variant is rare in Iranian population and it may not be a powerful genetic predisposing biomarker for prediction GC clinicopathological features in an Iranian population.
Objectives : The aim of this study was to evaluate the efficacy of Hwangryunhaedok-tang (HHT) and Gungangbuja-tang (GBT) on lipopolysaccharide (LPS)-induced mouse model of inflammation. HHT and GBT are one of the representative prescriptions of cold drug and one of the representative prescriptions of hot drug, respectively. For experimental evaluation of their efficacy, we investigated the anti-inflammatory effects of HHT and GBT on LPS-induced inflammation and the mechanisms of their action. Methods : ICR mice were given a HHT (50, 500 mg/kg), GBT (100, 1000 mg/kg) extract orally on three consecutive days. On the third day, they were administered LPS intraperitoneally (35 mg/kg), 1 h after the last sample administration. Blood and liver samples were taken 6 h after the LPS challenge. Cytokine expression and inflammation-related protein factor analyses were performed by Western blotting. Results : Oral administration of HHT significantly reduced pro-inflammatory cytokines, including interleukin (IL)-6, and interferon (IFN)-${\gamma}$ in the serum. While GBT inhibited an increase of IL-6, IFN-${\gamma}$ was not affected. Immunoblot analysis showed that LPS-induced NF-${\kappa}b$ activation was inhibited by GBT, meanwhile HHT only inhibited NF-${\kappa}b$ expression at high does (500 mg/kg). In addition, HHT and GBT inhibited LPS-induced phosphorylation of Erk1/2, Jnk and p38 MAPKs. GBT also significantly inhibited i-Nos and Cox-2 expression, and HHT inhibited only i-Nos expression. Conclusions : Both of HHT and GBT showed anti-inflammatory effects against LPS-induced endotoxemia. However, HHT significantly decreased inflammatory cytokine levels, such as IL-6 and IFN-${\gamma}$ more than GBT, while GBT significantly inhibited inflammatory proteins, including NF-${\kappa}b$, MAP Kinases, i-Nos and Cox-2, more than HHT. These results suggest that HHT and GBT regulate the different mechanisms of action and pathways, presumably by regulating cytokine levels (IL-6, IFN-${\gamma}$), NF-${\kappa}b$ activation, and several pro-inflammatory gene expression, although both of HHT and GBT have anti-inflammatory effects.
Objectives : Substantial evidence suggests that reinforcing effects of nicotine can be mediated by the mesolimbic dopaminergic system. It has been shown that repeated injections of nicotine produce an increase in locomotor activity and expression of the immediate-early gene, c-fos, in the dopaminergic target areas. Herbal medicine as a therapeutic intervention has been widely used for the treatment of mental dysfunction. Many studies have shown that Radix Scutellariae (RS) can affect the biochemical balance in the central nervous system. Tn order to investigate whether RS has an influence on nicotine-induced behavioral sensitization, we examined the effect of RS on nicotine-induced locomotor activity and c-fos expression in the striatum and nucleus accumbens utilizing the fos-tike immunohistochemistry (FLI). Methods : Male SD rats received RS (200mg/kg, i.p.) 30min before repeated daily injections of nicotine (0.4mg/kg, s.c.) for 7 days. This was followed by withdrawal for 3 days and one challenge for 1 day. Results : System challenge with nicotine produced a much larger increase in locomotor activity and accumbal FLI. Pretreatment with RS significantly inhibited nicotine-induced locomotor activity and FLI in the striatum and nucleus accumbens. Conclusions : These results demonstrate that reduction in locomotor activity by RS may be reflected by reduction of dopamine release and postsynaptic neuronal activity in the striatum and nucleus accumbens. Our results suggest that RS may have therapeutic effect on nicotine addiction.
Glutathione S-transferase (GST) is a multigene family of phase II detoxifying enzymes that metabolize a wide range of exogenous and endogenous electrophilic compounds. GSTM1 and GSTT1 gene polymorphisms may account for inter-individual variability in coping with oxidative stress. We investigated the relationships between the level of lymphocyte DNA and antioxidative parameters and the effect on GST genotypes. GSTM1 and GSTT1 were characterized in 301 young healthy Korean adults and compared with oxidative stress parameters such as the level of lymphocyte DNA, plasma antioxidant vitamins, and erythrocyte antioxidant enzymes in smokers and non smokers. GST genotype, degree of DNA damage in lymphocytes, erythrocyte activities of superoxide dismutase, catalase, and glutathione peroxidase (GSH-Px), and plasma concentrations of total radical-trapping antioxidant potential (TRAP), vitamin C, ${\alpha}$- and ${\gamma}$-tocopherol, ${\alpha}$- and ${\beta}$-carotene, and cryptoxanthin were analyzed. Lymphocyte DNA damage assessed by the comet assay was higher in smokers than that in non-smokers, but the levels of plasma vitamin C, ${\beta}$-carotene, TRAP, erythrocyte catalase, and GSH-Px were lower than those of non-smokers (p < 0.05). Lymphocyte DNA damage was higher in subjects with the GSTM1- or GSTT1-present genotype than those with the GSTM1-present or GSTT1- genotype. No difference in erythrocyte antioxidant enzyme activities, plasma TRAP, or vitamin levels was observed in subjects with the GSTM1 or GSTT1 genotypes, except ${\beta}$-carotene. Significant negative correlations were observed between lymphocyte DNA damage and plasma levels of TRAP and erythrocyte activities of catalase and GSH-Px after adjusting for smoking pack-years. Negative correlations were observed between plasma vitamin C and lymphocyte DNA damage only in individuals with the GSTM1-present or GSTT1- genotype. The interesting finding was the significant positive correlations between lymphocyte DNA damage and plasma levels of ${\alpha}$-carotene, ${\beta}$-carotene, and cryptoxanthin. In conclusion, the GSTM1- and GSTT1-present genotypes as well as smoking aggravated antioxidant status through lymphocyte DNA damage. This finding confirms that GST polymorphisms could be important determinants of antioxidant status in young smoking and non-smoking adults. Consequently, the protective effect of supplemental antioxidants on DNA damage in individuals carrying the GSTM1- or GSTT1-present genotypes might show significantly higher values than expected.
Background: Triple-negative breast cancer (TNBC), characterized by the lack of expression of estrogen receptor, progesterone receptor and human epidermal growth factor receptor-2, is typically associated with a poor prognosis. The majority of TNBCs show the expression of basal markers on gene expression profiling and most authors accept TNBC as basal-like (BL) breast cancer. However, a smaller fraction lacks a BL phenotype despite being TNBC. The literature is silent on non-basal-like (NBL) type of TNBC. The present study was aimed at defining behavioral differences between BL and NBL phenotypes. Objectives: i) Identify the TNBCs and categorize them into BL and NBL breast cancer. ii) Examine the behavioral differences between two subtypes. iii) Observe the pattern of treatment failure among TNBCs. Materials and Methods: All TNBC cases during January 2009-December 2010 were retrieved. The subjects fitting the inclusion criteria of study were differentiated into BL and NBL phenotypes using surrogate immunohistochemistry with three basal markers $34{\beta}E12$, c-Kit and EGFR as per the algorithm defined by Nielsen et al. The detailed data of subjects were collated from clinical records. The comparison of clinicopathological features between two subgroups was done using statistical analyses. The pattern of treatment failure along with its association with prognostic factors was assessed. Results: TNBC constituted 18% of breast cancer cases considered in the study. The BL and NBL subtypes accounted for 81% and 19% respectively of the TNBC group. No statistically significant association was seen between prognostic parameters and two phenotypes. Among patients with treatment failure, 19% were with BL and 15% were with NBL phenotype. The mean disease free survival (DFS) in groups BL and NBL was 30.0 and 37.9 months respectively, while mean overall survival (OS) was 31.93 and 38.5 months respectively. Treatment failure was significantly associated with stage (p=.023) among prognostic factors. Conclusions: Disease stage at presentation is an important prognostic factor influencing the treatment failure and survival among TNBCs. Increasing tumor size is related to lymph node positivity. BL tumors have a more aggressive clinical course than that of NBL as shown by shorter DFS and OS, despite having no statistically significant difference between prognostic parameters. New therapeutic alternatives should be explored for patients with this subtype of breast cancer.
Background: Several epidemiological studies have shown associations between colorectal cancer (CRC) risk and type 2 diabetes and obesity. Any effects would be expected to be mediated through the insulin pathway. Therefore it is possible that variants of genes encoding components of the insulin pathway play roles in CRC susceptibility. In this study, we hypothesized that polymorphisms in the genes involving the insulin pathway are associated with risk of CRC. Materials and Methods: The associations of four single nucleotide polymorphisms (SNPs) in IGF-I (rs6214), IGFBP-3 (rs3110697), INSR (rs1052371), and IRS2 (rs2289046) genes with the risk of CRC were evaluated using a case-control design with 167 CRC cases and 277 controls by the PCR-RFLP method. Results: Overall, we observed no significant difference in genotype and allele frequencies between the cases and controls for the IGF-I, IGFBP-3, INSR, IRS2 gene variants and CRC before or after adjusting for confounders (age, BMI, sex, and smoking status). However, we observed that the IRS2 (rs2289046) GG genotype compared with AA+AG genotypes has a protective effect for CRC in normal weight subjects (p=0.035, OR=0.259, 95%CI= 0.074-0.907). Conclusions: These findings do not support plausible associations between polymorphic variations in IGF-I, IGFBP-3, INSR, IRS2 genes and risk of CRC. However, the evidence for a link between the IRS2 (rs2289046) variant and risk of CRC dependent on the BMI of the subjects, requires confirmation in subsequent studies with greater sample size.
Site-specific incorporation of unnatural amino acids into proteins in vivo can be achieved by co-expression of an orthogonal pair of suppressor tRNA and engineered aminoacyl-tRNA synthetase (ARS) that specifically ligates an unnatural amino acid to the suppressor tRNA. As a step to establish this technique, here we generated an Escherichia coli reporter strain DH10B(Tn:lacZam) by integrating amber mutated lacZ gene into the chromosome of E. coli DH10B strain. In vivo expression of E. coli amber suppressor $tRNA^{Gln}$ produced blue colonies in culture plates containing X-Gal as well as dramatically increased $\beta$-galactosidase activity. In addition, expression of an orthogonal pair of Saccharomyces cerevisiae suppressor $tRNA^{Tyr}$ and tyrosyl-tRNA synthetase also produced blue colonies as well as moderate increase of $\beta$-galactosidase activity. These data demonstrate that our reporter strain will provide an efficient method to assess amber suppression in both qualitative and quantitative manners.
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