Nasal Endoscopy Versus Other Diagnostic Tools in Sinonasal Diseases.

Sinonasal endoscopy is an essential part of the rhinologic examination performed by otolaryngologists in the evaluation of sinonasal disease. The use of the endoscopes has been popularized with the advent of endoscopic sinus surgery. To evaluate the role of nasal endoscopy as primary examination in the early and accurate diagnosis of sinonasal diseases in comparison to other diagnostic tools in rhinology. A retrospective and prospective study was carried out on 200 patients with clinical evidence of sinonasal diseases. They were evaluated with anterior rhinoscopy, nasal endoscopy and CT paranasal sinus. The level of agreement between anterior rhinoscopy and nasal endoscopy was substantial for deviated nasal septum, inferior turbinate hypertrophy and polyp (0.735, 0.712 and 0.709, respectively), but moderate for middle turbinate hypertrophy (0.418). The results of endoscopy and CT comparison among 80 patients, whose symptoms warranted CT, indicated that although for most of the findings, there was almost perfect to substantial level of agreement between the results of the two methods, five patients had normal CT imaging report, while they demonstrated early polyps during endoscopic evaluation. Also, CT missed 4 cases of deviated nasal septum. Diagnostic nasal endoscopy proved a better technique to detect various sinonasal pathologies as well as anatomical variations, which are otherwise missed on Computed Tomography or inaccessible on anterior rhinoscopy especially in the key area comprising the ostiomeatal complex. We reinforce the fact that it should be viewed as an essential part of a complete examination of the nose and sinuses.

Eritoran inhibits S100A8-mediated TLR4/MD-2 activation and tumor growth by changing the immune microenvironment.

S100A8/A9 is a major component of the acute phase of inflammation, and appears to regulate cell proliferation, redox regulation and chemotaxis. We previously reported that S100A8/S100A9 are upregulated in the premetastatic lung. However, the detailed mechanisms by which S100A8 contributes to tumor progression have not been elucidated. In this study, we investigated the TLR4/MD-2 dependency by S100A8 on tumor progression. We found that S100A8 (2-89) peptide stimulated cell migration in a manner dependent on TLR4, MD-2 and MyD88. The S100A8 (2-89) peptide also activated p38 and NF-κB in TLR4-dependent manner. The peptide induced the upregulation of both IL-6 and Ccl2 in peritoneal macrophages obtained from wild-type mice, but not TLR4-deficient mice. We then investigated the responsible region of S100A8 for TLR4/MD-2 binding by a binding assay, and found that C-terminal region of S100A8 binds to TLR4/MD-2 complex. To further evaluate the TLR4 dependency on tumor microenvironment, Lewis lung carcinoma-bearing mice were treated with Eritoran, an antagonist of TLR4/MD-2 complex. We found that both tumor volume and pulmonary recruitment of myeloid-derived suppressor cells were reduced with the treatment of Eritoran for five consecutive days. Eritoran reduced the development of tumor vasculature, and increased tumor-infiltration of CD8(+) T-cells. Taken together, S100A8 appears to play a crucial role in the activation of the TLR4/MD-2 pathway and the promotion of a tumor growth-enhancing immune microenvironment.

Role of virtual bronchoscopy in children with a vegetable foreign body in the tracheobronchial tree.

OBJECTIVES: Multidetector computed tomography virtual bronchoscopy is a non-invasive diagnostic tool which provides a three-dimensional view of the tracheobronchial airway. This study aimed to evaluate the usefulness of virtual bronchoscopy in cases of vegetable foreign body aspiration in children. METHODS: The medical records of patients with a history of foreign body aspiration from August 2006 to August 2010 were reviewed. Data were collected regarding their clinical presentation and chest X-ray, virtual bronchoscopy and rigid bronchoscopy findings. Cases of metallic and other non-vegetable foreign bodies were excluded from the analysis. Patients with multidetector computed tomography virtual bronchoscopy showing features of vegetable foreign body were included in the analysis. For each patient, virtual bronchoscopy findings were reviewed and compared with those of rigid bronchoscopy. RESULTS: A total of 60 patients; all children ranging from 1 month to 8 years of age, were included. The mean age at presentation was 2.01 years. Rigid bronchoscopy confirmed the results of multidetector computed tomography virtual bronchoscopy (i.e. presence of foreign body, site of lodgement, and size and shape) in 59 patients. In the remaining case, a vegetable foreign body identified by virtual bronchoscopy was revealed by rigid bronchoscopy to be a thick mucus plug. Thus, the positive predictive value of virtual bronchoscopy was 98.3 per cent. CONCLUSION: Multidetector computed tomography virtual bronchoscopy is a sensitive and specific diagnostic tool for identifying radiolucent vegetable foreign bodies in the tracheobronchial tree. It can also provide a useful pre-operative road map for rigid bronchoscopy. Patients suspected of having an airway foreign body or chronic unexplained respiratory symptoms should undergo multidetector computed tomography virtual bronchoscopy to rule out a vegetable foreign body in the tracheobronchial tree and avoid general anaesthesia and invasive rigid bronchoscopy.

ADAM12-cleaved ephrin-A1 contributes to lung metastasis.

Eph receptor tyrosine kinases and their ephrin ligands have been implicated in neuronal development and neovascularization. Overexpression of ephrin-A1 has been implicated in tumor progression and poor prognosis. However, the mechanisms are not clear. Here, we report a role of the Eph/ephrin system in a cell adhesion mechanism. Clustered erythropoietin-producing hepatocellular receptor A1 (EphA1)/ephrin-A1 complexes on the plasma membrane did not undergo endocytosis, and the cell remained adherent to one another. The cell-cell contacts were maintained in an Eph tyrosine kinase activity-independent manner even in the absence of E-cadherin. EphA1 and ephrin-A1 co-localized in pulmonary endothelial cells, and regulated vascular permeability and metastasis in the lungs. We identified ADAM12 (A disintegrin and metalloproteinase 12) as an EphA1-binding partner by yeast two-hybrid screening and found that ADAM12 enhanced ephrin-A1 cleavage in response to transforming growth factor-ß1 in primary tumors. Released soluble ephrin-A1 in the serum deteriorated the EphA1/ephrin-A1-mediated cell adhesion in the lungs in an endocrine manner, causing lung hyperpermeability that facilitated tumor cell entry into the lungs. Depletion of soluble ephrin-A1 by its neutralizing antibody significantly inhibited lung metastasis.

Imbalance of Clara cell-mediated homeostatic inflammation is involved in lung metastasis.

We have previously shown that tumor necrosis factor (TNF)α produced from primary tumor-induced expression of two endogenous Toll-like receptor 4 (TLR4) ligands, S100A8 and serum amyloid A3 (SAA3), in pre-metastatic lungs. However, mechanistic details of the signaling network and relevance to pulmonary physiology are poorly understood. Here, we identify Clara cells as a control tower of the network. Clara cell ablation by naphthalene suppressed pulmonary recruitment of CD11b+TLR4+ cells and spontaneous lung metastasis. Clara cells turned out to express TLR4 through which SAA3 was auto-amplified. Reciprocal bone marrow transplantation between wild-type and TLR4 knockout mice demonstrated that pulmonary TLR4+ Clara cells could be derived from bone marrow. SAA3-induced TNFα expression in both alveolar type II cells and macrophages. Primary co-cultures of alveolar type II cells and Clara cells revealed that the induction of TNFα in alveolar type II cells was dependent on the Clara cell-mediated amplification of SAA3. SAA3 induction by bacterial endotoxin also required both Clara cells and TLR4. Thus, pulmonary metastatic soil may feature deregulation of homeostatic inflammatory responses to constant assaults of microbes with endotoxin.

Infant Feeding Practice of HIV Positive Mothers and its Determinants in Selected Health Institutions of Addis Ababa; Ethiopia

Background: Avoidance of all breast-feeding by HIV infected mothers is recommended when replacement feeding is acceptable; feasible; affordable; sustainable; and safe. Whereas for women whose HIV status is unknown or negative; exclusive breastfeeding for the first six months is the single infant feeding option recommended. Objective: To assess the infant feeding practice of HIV positive mothers and its determinants. Methods: A cross sectional study with analytical component was conducted in 13 purposively selected health institutions with ART and PMTCT facilities in Addis Ababa during March; 2008. A total of 327 HIV positive mothers with their young infants visiting the respective health institutions were recruited in order of arrival; and assessed for their infant feeding practices. Results: Exclusive replacement feeding (ERF); exclusive breastfeeding (EBF) and mixed feeding (MF) were 46.8; 30.6; and 15.3respectively. The predictors for choosing ERF were mode of delivery (p0.05); household income (p0.05) and disclosure of HIV status to spouse (p0.01). The predictor for EBF; was mode of delivery (p0.05) while for MF; disclosure of HIV status to spouse (p0.05); parental infant feeding attitude (p0.01) and infant illnesses (p0.01) were the predictors. Furthermore; sticking to mothers' informed safer feeding options is challenged by some social factors. Conclusion: The present study delineated the predictors involved in making safer choices for infant-feeding options. To achieve success in exclusivity of feeding options; mothers' decision should be respected and pressure from the family/neighbors to introduce other food to the infant needs to be discouraged. Furthermore; the risks involved in each infant feeding option should be communicated and advocated to the mother/father during PMTCT to make informed choices

Hsc70 regulates the nuclear export but not the import of influenza viral RNP: A possible target for the development of anti-influenza virus drugs.

In our previous report, we demonstrated that the matrix 1 (M1) protein of influenza virus directly binds to heat shock cognate protein 70 (Hsc70). The down-regulation of Hsc70 resulted in the reduction of influenza virus production, thus suggesting that Hsc70 plays a crucial role for viral replication. However, the detailed role of Hsc70 in viral replication remains to be elucidated. Hsc70 has been suggested to play a significant role in both the nuclear import and export processes. In this report, using leptomycin B (LMB), a CRM1-mediated nuclear export inhibitor, we demonstrated that Hsc70 forms a complex with vRNP through M1 in infected cells and in the virion, thus playing a significant role in the export of vRNP from the nucleus but not in the import of vRNP into the nucleus. The regulation of Hsc70 may therefore lead to the development of new anti-influenza virus drugs without raising mutant viruses.

Stylalgia and its surgical management by intra oral route -clinical experience of 332 cases.

Stylalgia is a pain syndrome occurring in connection with on elongated or malpositioned styloid piocess and is more common than generally thought. 332 cases of stylalgia were diagnosed over a period of 15 years. The charcteristic symptoms were chronic throat pain during swallowing with referred otalgia or referred pain to cheek or lower part of neck associated with foreign body sensation in throat. Movements of head or act of deglutition initiates or increases the pain The diagnosis of stylalgia is based on symptoms, palpation of enlarged styloid process mtraorally in the tonsillar region and elicitation of similar nagging throat pain or pain in the neck or foreign body sensation in the throat. Confirmation of enlarged styloid process is always done by radiological examination of styloid process per orbital view. Bilateral enlargement of tyloid process were found in 196 patients (59.03%) and unilateral enlargement was found in 136 (40.96%) patients. All the patients were operated under local anaesthesia by intra oral route without any complications.

TFIIH functions are altered by the P210BCR-ABL oncoprotein produced on the Philadelphia chromosome.

P210BCR-ABL counteracted against the complementary effect of XPB on DNA repair when ultraviolet (UV)-sensitive 27-1 cells were treated with UV or cisplatin but not with hydrogen peroxide. Wortmannin, an inhibitor of PI3 kinase did not affect its anti-repair effect. Enhanced recruitment of p44 with TFIIH after cisplatin treatment is inhibited by the expression of P210BCR-ABL in a kinase activity-dependent manner. Although purified TFIIH from P210BCR-ABL expressor and non-expressor showed almost no difference in molar ratio of each component, the in vitro activity of TFIIH was decreased by 5-10% in repair assay but was increased by more than two-fold in transcription assay.

Homophilic complex formation of MT1-MMP facilitates proMMP-2 activation on the cell surface and promotes tumor cell invasion.

Activation of proMMP-2 by MT1-MMP is considered to be a critical event in cancer cell invasion. In the activation step, TIMP-2 bound to MT1-MMP on the cell surface acts as a receptor for proMMP-2. Subsequently, adjacent TIMP-2-free MT1-MMP activates the proMMP-2 in the ternary complex. In this study, we demonstrate that MT1-MMP forms a homophilic complex through the hemopexin-like (PEX) domain that acts as a mechanism to keep MT1-MMP molecules close together to facilitate proMMP-2 activation. Deletion of the PEX domain in MT1-MMP, or swapping the domain with the one derived from MT4-MMP, abolished the ability to activate proMMP-2 on the cell surface without affecting the proteolytic activities. In addition, expression of the mutant MT1-MMP lacking the catalytic domain (MT1PEX-F) efficiently inhibited complex formation of the full-length enzymes and activation of pro MMP-2. Furthermore, expression of MT1PEX-F inhibited proMMP-2 activation and Matrigel invasion activity of invasive human fibrosarcoma HT1080 cells. These findings elucidate a new function of the PEX domain: regulating MT1-MMP activity on the cell surface, which accelerates cellular invasiveness in the tissue.

The Dbl homology domain of BCR is not a simple spacer in P210BCR-ABL of the Philadelphia chromosome.

The Dbl homology (DH) domain of BCR in P210BCR-ABL (P210/WT) has been thought to have a negative effect on the activation of BCR-ABL because P185BCR-ABL, in which this region is physically deleted, has stronger biochemical and biological activities. To study the role of the DH domain of BCR in the background of P210/WT, the region was replaced with homologous sequences derived from Dbl (P210/Dbl) or CDC24 (P210/CDC24) or with irrelevant sequences from LacZ (P210/LacZ) or luciferase (P210/Luci). Surprisingly, the abilities to transform Rat1 cells or mouse bone marrow cells and induce growth factor independence in interleukin 3-dependent mouse Ba/F3 cells were retained only in P210/Dbl. However, even P210/Dbl could not achieve the wild type level of surviving potential against genotoxins in Rat1 cells and in Ba/F3 cells. Activation of Akt correlated with the biological changes in Rat1 cells but did not correlate with the biological changes in Ba/F3 cells. The DH domain was not tyrosine-phosphorylated in vitro, nor could we find any differences in peptide mapping between in vitro phosphorylated P210/WT and P210/Dbl. Although functions of the DH domain remain to be discovered, we propose that the DH domain makes positive contributions to P210BCR-ABL.

Inhibition of protein kinase C delta has negative effect on anchorage-independent growth of BCR-ABL-transformed Rat1 cells.

The BCR-ABL oncoprotein transmits transformation signals mainly through pathways involving Ras, Myc and PI3 kinase. Here we report that inhibition of protein kinase C (PKC) delta had negative influence on anchorage-independent growth of Rat1 cells transformed by BCR-ABL. The effect was observed with delta isoform-specific inhibitor rottlerin, but not with Go6976 that inhibits only conventional isoforms. The kinase activity of delta isoform was found to be roughly two-fold higher in BCR-ABL-expressing Rat1 cells than that in mock. Although overexpression of wild type PKC delta did not enhance soft agar colony number by BCR-ABL-transformed Rat1 cells, that of dominant-negative delta isoform reduced it by approximately 40%.

The tubulogenic activity associated with an activated form of Flt-1 kinase is dependent on focal adhesion kinase.

Focal adhesion kinase (FAK) is known to be located at the intersection between extracellular matrix and growth factor signaling pathways to regulate cell motility. We have shown previously that an activated form (BCR-FLTm1) of Flt-1 kinase, a receptor for vascular endothelial growth factor, had a tubulogenic activity not only in endothelial cells but also in fibroblastic cells. Here we show that tubulogenesis by BCR-FLTm1 depends on FAK and that FAK tyrosine phosphorylation and association with an activated Flt-1 receptor complex is increased after vascular endothelial growth factor stimulation of NIH3T3 cells overexpressing Flt-1.

State of HBV DNA in HBsAg-negative, anti-HCV-positive hepatocellular carcinoma: existence of HBV DNA possibly as nonintegrated form with analysis by Alu-HBV DNA PCR and conventional HBV PCR.

The role of hepatitis B virus (HBV) in carcinogenesis of hepatitis B surface antigen (HBsAg)-negative, anti-hepatitis C virus (anti-HCV)-positive hepatocellular carcinoma (HCC) remains unknown. To investigate the state of HBV DNA in such HCC, HBV DNA was examined by polymerase chain reaction (PCR) between HBV DNA and human Alu sequence (HBV-Alu PCR), which could detect integrated form of HBV DNA only, and by conventional HBV PCR, which could detect both integrated and episomal forms of HBV DNA. In all the 17 HBsAg-positive HCC, HBV DNA was detected by both HBV-Alu PCR method and conventional HBV PCR method. By contrast, in HBsAg-negative, anti-HCV-positive cases, HBV DNA was detected in 10 of 21 (47.6%) by conventional HBV PCR and in none of 21 (0%) by HBV-Alu PCR method. Thus, integrated form of HBV DNA was not found in most HbsAg-negative, anti-HCV-positive HCC in the current study. The role of episomal form of HBV DNA requires further investigation of its involvement in the process of the development of HBsAg-negative, anti-HCV-positive HCC.

Molecular biology of chronic myeloid leukemia.

Multistep carcinogenesis is exemplified by chronic myeloid leukemia with clinical manifestation consisting of a chronic phase and blast crisis. Pathological generation of BCR-ABL (breakpoint cluster region-Abelson) results in growth promotion, differentiation, resistance to apoptosis, and defect in DNA repair in targeted blood cells. Domains in BCR and ABL sequences work in concert to elicit a variety of leukemogenic signals including Ras, STAT5 (signal transducer and activator of transcription-5), Myc, cyclin D1, P13 (phosphatidylinositol 3-kinase), RIN1 (Ras interaction/interference), and activation of actin cytoskeleton. However, the mechanism of differentiation of transformed cells is poorly understood. A mutator phenotype of BCR-ABL could explain the transformation to blast crisis. The aim of this review is to integrate molecular and biological information on BCR, ABL, and BCR-ABL and to focus on how signaling from those molecules mirrors the biological phenotypes of chronic myeloid leukemia.

Hepatic arterial infusion of 5-fluorouracil for liver metastases from pancreatic carcinoma: results from a pilot study.

BACKGROUND/AIMS: Liver metastasis is a common progression of pancreatic carcinoma, but an effective chemotherapy has not been established. The purpose of this study was to examine the efficacy and safety of a hepatic arterial infusion of 5-FU in patients with liver metastasis from pancreatic carcinoma. METHODOLOGY: Thirteen patients were enrolled in a pilot study of a hepatic arterial infusion of 5-FU therapy. They received 5-FU for 5 days at a dose of 500 mg/m2/day by continuous hepatic arterial infusion every 4 weeks. RESULTS: One patient showed a partial response, while 6 showed no change. Of these 6 patients, 2 showed a minor response. The overall response rate was 8% (95% confidence interval: 0-22%). Nausea and vomiting were the most common types of toxicity. Three patients (23%) had hepatic arterial occlusion. There were no life-threatening toxicities or complications. The overall median survival time was 15.9 weeks. CONCLUSIONS: Hepatic arterial infusion of 5-FU in patients with liver metastasis from pancreatic carcinoma is tolerable but is minimally effective at this dose and schedule. The schedule of administration should be modified.

Phase I trial of gemcitabine in patients with advanced pancreatic cancer.

BACKGROUND: Gemcitabine is the most promising new agent currently being tested in pancreatic cancer. The present study was conducted to confirm the tolerability of a weekly schedule of gemcitabine at a dose of 1000 mg/m2 in Japanese patients with advanced pancreatic cancer. METHODS: The primary end-point was to evaluate the frequency of dose-limiting toxicity. Gemcitabine 1000 mg/m2 was administered over 30 min weekly in two schedules: gemcitabine x3 every 4 weeks (Schedule 1) and gemcitabine x7 followed by a week of rest and then gemcitabine x3 every 4 weeks thereafter (Schedule 2). At least three patients entered each schedule and three additional patients were treated in the presence of dose-limiting toxicity. RESULTS: Eleven chemo-naive patients with a good Karnofsky performance status of > or =80 points and distant metastasis were entered into this trial. In Schedule 1, no dose-limiting toxicity was observed in the three patients. In Schedule 2, the evaluation of dose-limiting toxicity was complete in six of the eight enrolled patients and two patients showed dose-limiting toxicity in this Schedule; one patient experienced both grade 4 leukocytopenia and grade 4 neutropenia, and both grade 4 neutropenia and grade 3 GOT/GPT increased in another patient. Two patients (18%) showed a partial response and a clinical benefit response was also achieved in two (29%) of the seven evaluable patients. CONCLUSION: Gemcitabine 1000 mg/m2 weekly x7 followed by a week of rest and weekly x3 every 4 weeks thereafter may be tolerated in Japanese patients with advanced pancreatic cancer.

Visualization of blood flow in hepatic vessels and hepatocellular carcinoma using B-flow sonography.

PURPOSE: A B-flow sonographic technique was recently developed to provide direct visualization of blood flow with gray-scale sonography. Compared with color Doppler sonography, B-flow imaging has wideband resolution and a high frame rate. The purpose of this study was to evaluate the usefulness of B-flow sonography for visualizing blood flow in hepatic vessels and tumor vascularity in patients with liver cirrhosis or hepatocellular carcinoma (HCC). METHODS: Twenty-five patients with liver cirrhosis, including 15 with HCC, were studied by B-flow and color Doppler sonography. Blood-flow detection rates in portal veins and hepatic arteries and tumor vascularity in HCC were analyzed, and the 2 methods were compared. RESULTS: Using B-flow, blood flow was visualized in the portal vein in 23 (92%) of 25 patients and was visualized in the hepatic artery separately from the portal vein in 9 (36%) of 25 patients. The blood-flow signals were visualized only within vessels, never "bleeding" outside the vessel's lumen. Blood flow in the portal vein was observed with color Doppler sonography in all 25 patients, but the hepatic artery was never clearly separated from the portal vein. Vascularity within the HCC tumor was detected in 9 (60%) of 15 nodules with B-flow imaging, and fine arteries flowing into the tumor were observed in 6 nodules. Color Doppler sonography detected blood flow in 13 (87%) of the 15 HCC nodules. CONCLUSIONS: Blood flow in hepatic vessels and tumor vessels of HCC were visualized with B-flow sonography. B-flow sonography is a potentially useful technique for the evaluation of liver vascularity and intratumoral vessels.

Involvement of Flt-1 tyrosine kinase (vascular endothelial growth factor receptor-1) in pathological angiogenesis.

Vascular endothelial growth factor (VEGF) and its two receptors, Fms-like tyrosine kinase 1 (Flt-1) (VEGFR-1) and KDR/Flk-1 (VEGFR-2), have been demonstrated to be an essential regulatory system for blood vessel formation in mammals. KDR is a major positive signal transducer for angiogenesis through its strong tyrosine kinase activity. Flt-1 has a unique biochemical activity, 10-fold higher affinity to VEGF, whereas much weaker tyrosine kinase activity compared with KDR. Recently, we and others have shown that Flt-1 has a negative regulatory function for physiological angiogenesis in the embryo, possibly with its strong VEGF-trapping activity. However, it is still open to question whether the tyrosine kinase of Flt-1 has any positive role in angiogenesis at adult stages. In this study, we examined whether Flt-1+ could be a positive signal transducer under certain pathological conditions, such as angiogenesis with tumors overexpressing a Flt-1-specific, VEGF-related ligand. Our results show clearly that murine Lewis lung carcinoma cells overexpressing placenta growth factor-2, an Flt-1-specific ligand, grew in wild-type mice much faster than in Flt-1 tyrosine kinase domain-deficient mice. Blood vessel formation in tumor tissue was higher in wild-type mice than in Flt-1 tyrosine kinase-deficient mice. On the other hand, the same carcinoma cells overexpressing VEGF showed no clear difference in the tumor growth rate between these two genotypes of mice. These results indicate that Flt-1 is a positive regulator using its tyrosine kinase under pathological conditions when the Flt-1-specific ligand is abnormally highly expressed. Thus, Flt-1 has a dual function in angiogenesis, acting in a positive or negative manner in different biological conditions.