An enzyme that is essential for virus propagation due to its ability to Kinase Inhibitor Library cleave the sialylated virus receptor, thus releasing viral progeny. Zanamivir, a neuraminidase inhibitor, is one of drugs used to treat patients infected with the influenza virus. Wen-Hsien Wen et al. showed that tetrameric zanamivir conjugates based on a porphyrin core structure, despite being less potent in inhibiting neuraminidase, are significantly more potent in inactivating influenza viruses. The authors attribute this effect to the high local concentration of the photosensitizer porphyrin, which generates O2 in a close proximity to the virus surface. The nucleic acids in non-enveloped viruses are enclosed in protective, protein-only capsids. Capsids in non-enveloped viruses have simple symmetric structures and are formed from many identical subunits composed of one or several proteins. The protein-protein interactions among these subunits maintain a tightly packed, stable capsid structure that is able to survive exposure to extreme pH levels, harsh environmental conditions, proteolytic enzymes, or even strong detergents in some cases. VP1 from both polyomaviruses contains a b-sandwich core with several outfacing loops. These interactive loops are exposed on the surface of VP1 pentamers and polyomavirus capsids. Computer analysis revealed the presence of several tyrosine and tryptophan residues as well as one histidine and one methionine residue in the surface loops. Many other sensitive amino acid residues occurring in the VP1 b-sandwich core might be less accessible. The level of accessibility of the amino acid residues that are sensitive to O2 can differ among capsid proteins of nonenveloped viruses, and it will be necessary to test the efficiency of their inactivation individually. Recently, efficient inactivation of the non-enveloped bacteriophage MS-2 by visible light was reported based on using a cationic fullerene derivative with amine functionality as a photosensitizer to produce O2. Based on the computer analysis of capsid subunits from viruses with known tertiary structures, we predict that human papillomaviruses or poliovirus can be efficiently inactivated by O2 produced by the photosensitizer used in this study. Thus, the photosensitizers immobilized on the nanofibers can be highly useful for the development of novel approaches for inactivating both enveloped and non-enveloped viruses. Rheumatoid arthritis is a systemic chronic autoimmune disease that mainly affects the joints and ultimately leads to severe bone and cartilage destruction. The clinical course of the disease is discontinuous and characterised by spontaneous remissions and exacerbations. The aetiology in RA is largely unknown but for some reason the immune system – which normally protects us against exogenous pathogens – is dysregulated and has lost its normal tolerance to endogenous structures and mediates an inflammatory attack against e.g. the joints. Todays treatment is based on continuous immunosuppression either by conventional disease modifying anti-rheumatic drugs such as methotrexate and/ or by biological agents targeting specific proteins e.g. TNF. Unfortunately these treatment modalities can cause side effects such as severe infections and, in addition, attempts to withdraw therapies in established RA often leads to flares. To overcome these hurdles, disease-regulated therapy appears ideally suited, as it would allow intrinsic expression of the immunosuppressive therapy only during inflammatory conditions i.e. during disease flares but not during periods of remissions. This approach has been used successfully in experimental autoimmune encephalomyelitis where, by means of transcriptionally targeted gene therapy, a T cell targeted IL-2 promoter controlling IL-10 production delayed onset and progression of EA.
Monthly Archives: November 2020
MUC4/8G7 was expressed mainly in the cytoplasm of the neoplastic cells of pap and tub
In the previous study of gastric cancers using MAb 8G7, Senapati et al. demonstrated that MUC4/8G7 Fingolimod expression was not associated with tumor type, stage or with the degree of differentiation. Interestingly, their results showed an 42% expression rate in the stage I cancers, which is in accordance with our data in the present study examining stage I cancers. However, our study revealed that both MUC4/8G7 and MUC4/ 1G8 expressions were different among the histological types, and were significantly higher in the well differentiated types than in the poorly differentiated type. MUC1/DF3 expression was also significantly higher in the well differentiated types than in the poorly differentiated type. We reported that MUC1 expression was high in the well differentiated adenocarcinoma in gastric cancers including advanced cancers, and the high MUC1 expression may affect the survival of patients with well differentiated adenocarcinoma of stomach. The high expression of MUC4 in the well differentiated adenocarcinoma also may affect the survival of patients with gastric cancer. In our previous study, the rate of high expression of MUC1/DF3 was significantly higher in the advanced gastric cancers than that in the early gastric cancers. The relationship of MUC4 expression with the invasion of gastric cancers would be an interesting area of study. There is controversy regarding the prognostic significance of MUC4/8G7 and MUC4/1G8 expression. Thus, we have reviewed 19 articles of MUC4 IHC study applied for various human cancer tissues. The significance of MUC4/8G7 and MUC4/1G8 could not be evaluated in 8 of the 19 studies. One study using polyclonal anti-MIUC4 antibody reported that MUC4 expression is related to a fovorabel outcome, three studies show no correlation between MUC4 expression and prognosis, the other three studies did not have any comments on the correlation between MUC4 expression and prognosis, and the remaining one study of thyroid cancer reported no MUC4 expression in the cancer. On the other hand, in the other 11 articles, there was an apparent difference of the prognostic significance between MUC4/8G7 expression and MUC4/1G8 expression. Most studies using 8G7, which was generated against human MUC4, MUC4/8G7 expression is related to aggressive tumor behavior or a poor outcome in human carcinomas. In contrast, most studies using 1G8, which was raised against rat ASGP-2, described that MUC4/1G8 expression is related to a favorable outcome, although one study of pancreatic adenocarcinoma described that MUC4/1G8 expression is related to poor survival. This clear difference raises the question of whether 8G7 and 1G8 have essentially different characters. The MAb 1G8 was raised using rat Muc4 epitope. Human MUC4 and rat Muc4 shows more than 60% peptide sequence similarity, but they are not identical. It is noteworthy that IHC using MAb 1G8 always shows positive staining in the vascular endothelium, which is somewhat unusual as the expression of MUC4 which is one of the members of mucins. Thus, we evaluated the specificity of the MAb 8G7 and MAb 1G8 by Western blotting and IHC of two gastric cancer cell lines. Our Western blotting analysis showed that MAb 8G7 recognized a very high molecular weight protein, whereas MAb 1G8 does not show any immunoreactive bands. The IHC analysis also showed MAb 8G7 positive staining but MAb 1G8 negative staining in the two gastric cancer cell lines. MUC4 mRNA was also expressed in the two gastric cancer cell lines in the present study, as shown in the previous study analyzing the pancreatic cancer cell lines by RTPCR and northen blot analyses. Both MAb 8G7 and MAb 1G8 react with human gastric cancer tissues, although the locations of MUC4/8G7 and MUC4/1G8 expression showed a marked difference.
The MAb 8G7 recognizes a tandem repeat sequence of the human MUC4a subunit
For the early gastric cancers, an endoscopic submucosal dissection is the first choice treatment in Japan, but the criteria of the additional surgery including lymph node dissection after the ESD are still controversial. Our series of immunohistochemistry studies for mucin expression in various human neoplasms have demonstrated that the expression of the MUC1 mucin is related with invasive proliferation of the tumors and poor outcome of the patients, whereas the expression of the MUC2 mucin is related with the non-invasive proliferation of the tumors and a favorable outcome for the patients. Our previous study showed that MUC1 expression in gastric cancers is a poor prognostic factor. MUC4 was first reported as tracheobronchial mucin and is a membrane-associated mucin. In our study series, the expression of MUC4 in intrahepatic cholangiocarcinoma, pancreatic ductal adenocarcinoma, extrahepatic bile duct carcinoma, lung adenocarcinoma, and oral squamous cell Regorafenib carcinoma was an independent factor for poor prognosis and is a useful marker to predict the outcome of the patients. Unfortunatly, there are few studies of the MUC4 expression profile in human gastric cancer. In the present study, we examined the expression profiles of MUC4 as well as MUC1 in early gastric cancer tissues, and found that MUC4 and MUC1 expression in the early gastric cancers would become poor prognostic factors by lymph vessel invasion, blood vessel invasion and lymph node metastasis. As anti-MUC4 monoclonal antibodies, 8G7 and 1G8, are known to detect different sites of MUC4 molecule. The MAb 1G8 is raised against the rat sequence, and recognizes an epitope on the rat ASGP-2 subunit, which corresponds to the human MUC4b subunit, and shows a cross reactivity with human samples. Thus, a special attention was paid to the comparison of two anti-MUC4 MAbs by Western blotting and IHC of two gastric cancer cell lines, before the IHC study of human gastric cancer tissues. Moreover, since there is controversy regarding the prognostic significance of these antiMUC4 MAbs, a literature review of MUC4 expression in various cancers was also performed. Recently, we have reported that the expression of MUC4 is an independent poor prognostic factor of pancreatobiliary adenocarcinomas as well as lung adenocarcinoma and oral squamous cell carcinoma. MUC1 has also been reported to be a poor prognostic factor in various human neoplasms. Our previous study in gastric cancers, including both early cancers and advanced cancers demonstrated that MUC1 is a useful prognostic factor for poor outcome in the patients. In the present study, the relationship between mucin expression and the patient’s outcome cannot be evaluated, because the gastric cancers are in the early stage at pT1b2 and most of the patients have had a favorable outcome. Nevertheless, the following results were obtained: The MUC4/8G7, MUC4/1G8 and MUC1/DF3 expressions were related with lymphatic invasion. The MUC4/ 1G8 expression was related with lymph node metastasis. The MU1/DF3 expression was related with venous invasion. In Japan, ESD is the first choice treatment for early gastric cancers. Examination of MUC4 as well as MUC1 in the ESD specimens may clarify whether the additional surgery, including lymph node dissection or frequent follow-up for the metastasis are necessary. Our previous studies demonstrated that there was no siginificant correlation between MUC4 expression and MUC1 expression. Also in the present study of the gastric cancers in the early stage, there was no siginificant correlation between expression of MUC4 and MUC1. Both MUC4 and MUC1 expression in the gastric cancers may be related with the poor prognostic factors, such as lymphatic invasion, venous invasion and lymph node metastasis.
As different species and strains have different capacity to alter the cytokine responses later in life
Suppressed their PHAstimulated cytokine responses of IL-12, IL-13 and IFN-c followed by a reduction of clinical symptom scores, which is interesting in relation to the findings presented in our study. We should acknowledge the relatively low number of individuals in this study, and the findings need to be confirmed in larger studies. However, we only report results that are consistent at several early time points, thus increasing the probability of true findings. Further, it should be mentioned that results of our in vitro studies are based on the effects of bacterial supernatants that may not represent the in vivo situation in the intestinal tract. In conclusion, we demonstrate that the early infant microbiota associates with the numbers of cytokine-secreting cells at two years of age, in a genus- and species specific manner, which we further confirmed by in vitro stimulations. The early-life gut microbiota could modulate the risk of developing inflammatory conditions like allergic disease. Diabetes mellitus has become one of the most severe endocrine metabolic disorders in the world. Diabetes damages multiple SP600125 JNK inhibitor organs to induce serious complications such as coronary artery disease, renal and ophthalmologic diseases that can result in the disability and mortality for diabetic patients. Liver disease as one of diabetic complications has not been well addressed, but it actually can be very significant. Increasing evidence suggests that among patients with diabetes, the standardized mortality rate from end-stage liver disease is higher than that for cardiovascular disease. The liver plays a pivotal role in glucose homeostasis since it stores glycogen in the fed state and produces glucose through glycogenolysis and gluconeogenesis in the postabsorptive period. Several hormones and metabolic factors engage in the maintenance of glucose homeostasis. In physiological conditions, hepatocytes are the main site of hepatic glucose metabolism. It has been estimated that 30 to 60% of all glucose absorbed in the gastrointestinal tract undergoes hepatic processing with subsequent storage as glycogen or metabolism into amino acids or fatty acids. Insulin and glucagon are two counter-regulatory hormones involved in the regulation of energy metabolism. Insulin enhances glycogen synthesis within the liver and prevents glucose production. Reversely, glucagon induces glucose production and prevents glycogen synthesis. The failure of hepatocytes to respond to insulin induced by diabetes results in uncontrolled gluconeogenesis, glycogenolysis and lipogenesis, promoting hyperglycemia, dyslipidemia and systemic insulin resistance, which will lead to diabetic liver complications such as steatohepatitis, chronic viral hepatitis, and hepatocellular carcinoma. Although insulin resistance is usually associated with the development of type 2 diabetes, it can also be a feature of patients with type 1 diabetes. Insulin resistance has been documented in type 1 diabetes and may contribute to the high risk for cardiovascular disease in this population. In a recent review, it was stated that in type 1 diabetic population, an increased prevalence of obesity and insulin resistance often leads the development of nonalcoholic fatty liver diseases. Zinc is an essential trace element and plays a critical role in cellular integrity and biological functions in respect to cell division, growth, and development. Zn also acts as cofactor for many enzymes and proteins involved in the antioxidant, anti-inflammatory, and anti-apoptotic effects. The liver is important for the regulation of Zn homeostasis, while Zn is necessary for normal hepatic function. Reduced hepatic Zn levels have been correlated with the impaired liver function and regeneration, and it also implicated in both acute and chronic liver disease states.
Polysomes analysis provides an estimate of the efficiency of translation initiation and elongation
Plant makes and transports sucrose for store or for use through photosynthesis activity. If photosynthesis was impaired, sucrose starvation will greatly decrease plant growth. In addition, the growth of the cplepa-1 mutant is reduced when grown on soil, and the reduction is increased under high light illumination. Moreover, the cplepa-1 mutant shows a slightly pale green phenotype and impaired chloroplast development. PSII and PSI activities are also decreased when grown on soil. These results indicate that, although cpLEPA is not essential under optimal conditions, it becomes critical under nutrient limitation or light stress conditions. PSII activity, indicated by the Fv/Fm value, revealed enhanced sensitivity to TH-302 918633-87-1 high-light treatment in the cplepa-1 mutant in the absence of lincomycin compared with the wild-type plants. The rate of PSII photoinhibition was similar in the mutant and wild-type plants in the presence of the protein synthesis inhibitor lincomycin. The adverse effect of high light on the cplepa-1 mutant indicates that the repair of PSII was perturbed. Thus, cpLEPA might be involved in the regulation of the synthesis of PSII proteins. The association of the chloroplast-encoded psbA, psbB, psaA/ psaB and atpB mRNAs with ribosomes in the mutant grown on soil showed a small shift toward the top of the gradient in the ribosome loading assay, this indicated that translation initiation was impaired in these transcripts. However, the distribution of mutant and wild type plastid 23S rRNA, ndhA, petA and psaJ transcripts were unchanged in the sucrose gradients. Further exploration of the distribution of polysome association revealed that 23S rRNA displayed a different sensitivity to EDTA compared with rbcL mRNA. It is likely that a significant proportion of the 23S rRNA is found in ribonucleoprotein complexes other than polysomes. Alternatively the ribosomes on which these chloroplast mRNAs are translated represent only a small part of the total ribosome pool. The steady-state transcript levels of PEP-dependent genes, including psbA, psbB, rbcL, psaA, atpB and psbD, decreased drastically in cplepa-1 mutants grown on soil. Changes in chloroplast translation might modulate the stability of a subset of chloroplast mRNA molecules. The inactivation of AtprfB affects the polysomal association of the atpE transcript and leads to a 50% reduction in the amount of atpE transcripts. In apg3-1, the abnormal polysomal association of UAG-containing transcripts leads to decreased stability of the transcripts. In hcf173, the decreased ribosomal loading of the psbA transcript affects the stability of the psbA transcript and leads to a significant reduction in its steady-state level. In addition, decreased protein levels of RPOA and RPOB were observed in the cplepa mutant. Thus, it is likely that the dramatic loss in chloroplast transcripts observed in the cplepa mutant might be the synergistic effect of decreased chloroplast translation and decreased PEP transcription. Photosynthetic activity is somewhat impaired in cplepa-1 mutants, which is reflected in the decreased steady-state level of chloroplast proteins. Although a dramatic loss in chloroplast transcripts and a perturbation in chloroplast polysome loading were observed in the cplepA mutant, only an approximate 20% decrease was observed in the steady-state levels of the proteins. One possibility is that chloroplast genes are transcribed in excess. The rpoA mRNA levels are 30-fold higher than the rpoB mRNA levels, but the steady-state protein level of RpoB is approximately 50% of that of RpoA. Similarly, the psbA mRNA levels are fivefold greater than those of the psaA-psaB transcripts because of the increased turnover rate of psbA needed to maintain normal photosynthetic activity, whereas the protein levels of these genes remain similar.