A more straightforward ELISA

A more straightforward ELISA Selleck Fluorouracil based on mAbs to the LAP entity was therefore developed. When the LAP ELISA was used to measure Latent TGF-β1 in non-dissociated samples, the observed levels were comparable to total TGF-β1 levels determined by TGF-β1 ELISA. The correlation between the assays, together with the fact that total TGF-β1 levels to > 98.5% derived from Latent TGF-β1, demonstrated the ability of the LAP ELISA to measure Latent TGF-β1 in human samples. Compared to the conventional analysis by TGF-β1 ELISA,

the LAP ELISA provides several advantages. The LAP ELISA analysis can be made without preceding sample acidification and neutralization, procedures that are necessary for the total TGF-β1 ELISA but also involve an increased risk of errors due to incomplete dissociation after acidification or re-association after neutralization (Kropf et al., 1997). In the LAP ELISA, acid treatment did not affect the levels determined demonstrating an equal reactivity of Latent TGF-β1 and dissociated LAP. In addition

to simplifying the analytical selleck products procedure, eliminating the use of acid facilitates inclusion of LAP-specific reagents in multiplex analyses including cytokines sensitive to low pH. Each TGF-β isoform is preserved through evolution with close to 100% homology across mammals. Human TGF-β1 is e.g. identical to bovine TGF-β1 and differs only by one amino acid from murine TGF-β1. TGF-β1 ELISAs therefore react with TGF-β1 from bovine Latent TGF-β1, if bovine serum has been added to human cell cultures. The LAP proteins are less conserved and human LAP1 displays 92% and 85% homology to bovine and murine LAP1, respectively. Accordingly, no reactivity with bovine Latent TGF-β1 was displayed by the LAP ELISA, making it possible to analyze human cell supernatants without interference by bovine Latent TGF-β1. The LAP ELISA did however react with Latent TGF-β1 from the evolutionary more closely related macaques. The similar levels detected by LAP and TGF-β1 ELISA in macaques samples

Terminal deoxynucleotidyl transferase indicate a high degree of cross-reactivity of the LAP ELISA which could be valuable considering the use of macaques as an animal model for various human diseases including AIDS. Compared to the high interspecies conservation of TGF-β1, the homology between human TGF-β isoforms is lower (≤ 77%) and even lower is the homology between LAP isoforms (≤ 41%). Consequently, the LAP ELISA did not recognize LAP from human Latent TGF-β2 and − 3. Also the individual reactivity of the mAbs used in LAP ELISA as well as MT324, the only mAb functional in Western blotting, was restricted to LAP1. A factor that could interfere with the detection of Latent TGF-β1 by LAP ELISA is the binding of LTBPs to LAP. The cysteine residue at position 33 in LAP can form a disulfide bond with LTBP and non-malignant cells generally secrete Latent TGF-β1 as a large latent complex associated with LTBPs (Mangasser-Stephan and Gressner, 1999).

, 1996, Elenkov et al , 2000, Woiciechowsky et al , 1998, Zhang e

, 1996, Elenkov et al., 2000, Woiciechowsky et al., 1998, Zhang et al., 2005 and Souza-Queiroz et al., 2008). B2-agonists inhibit IL-12 production (Panina-Bordignon et al., 1997), which is known to have a central role in the immune system by skewing the immune response towards Th1-type

responses. In this respect, studies from our laboratory and others (Hasegawa et al., 1997, Queiroz et al., 2002, Queiroz et al., 2011, Souza-Queiroz INNO-406 et al., 2008 and Torello et al., 2010) have proposed that CV has a direct myelostimulating outcome through inducing the Th1 response via activation of macrophages to produce IL-12 and IFN-γ. Previous findings from our laboratory demonstrated that pre-treatment with CV prevented this decrease in IFN-γ (Th1) and increase in IL-10 (Th2) after an acute foot-shock stressor (Souza-Queiroz et al., 2008). This reduction in IL-1 and TNF-α was prevented by treating mice with CV that were inoculated with tumors (Ramos et al., 2010) or exposed to lead (Queiroz et al., 2008 and Queiroz et al., 2011). These cytokines are known to stimulate the production of neutrophils from the bone marrow and to mediate chemoattraction of granulocytes from the circulation

to peripheral sites of injury. In the present study, we observed that the effects produced by both single and repeated stressors were suppressive, however, SST had a stronger impact on most of the parameters evaluated. This could be selleck inhibitor explained by a decrease in hormone release due to glandular exhaustion or down-regulation of receptors,

among other possibilities, or it could also be explained by a reduction in the emotional impact initially caused by the stressful situation, thus leading to a decreased endocrine response over time (Armario, 2001). Delineating how stress influences hematopoiesis is important for developing potential pharmacological interventions to decrease the incidence of stress-induced immune dysfunction. Interleukin-2 receptor Irrespective of the mechanisms involved, the immunomodulatory effect of CV on stressed mice may have an important role in protecting hosts from stressful situations, leading to an increase in the ability of the immune system to respond to this challenge (for an overview of the mechanisms of action from CV on stressed mice observed in this study, see Fig. 9). This research, which is part of the Ph.D. dissertation to be presented by Julia de Souza Queiroz to the Department de Farmacology/Hemocentro, Faculdade de Ciências Médicas, Universidade Estadual de Campinas, Campinas, São Paulo, Brazil, was supported by the FAPESP Foundation (No. 09/51886-3) and CNPq (No. 300764/2010-3); the authors wish to express their sincere gratitude. “
“Symbioses play a central role in the evolution of biological complexity and leaf-cutting ants are a prodigious example of this (Ness et al., 2010).

1, spanning at least 50 kb, and is composed of six introns The f

1, spanning at least 50 kb, and is composed of six introns. The full length of mRNA is 2245-bp, encoding a type III transmembrane protein with four transmembrane regions. It has been reported that LAPTM4B is expressed fairly low in normal adult tissue but high in various types of carcinomas [9]. The overexpression of LAPTM4B is associated with unfavorable biological behaviors

and poor prognosis of many carcinomas, such as hepatocellular carcinoma [10], gallbladder carcinoma [11], colorectal carcinoma [12], epithelial ovarian carcinoma [13] and endometrial carcinoma [14]. LAPTM4B could active PI3K/AKT signaling pathway, Selleckchem Roxadustat which motivates multi-drug resistance [15] and also involved in drug resistance of melanoma targeted therapy [16]. LAPTM4B is also crucial for autophagy maturation see more that associated with chemotherapy resistance and enhances tumor survival in metabolic and genotoxic stress [17] and [18]. There are two alleles of LAPTM4B in the 5′ untranslated region, named *1 and *2 (GenBank

accession numbers AY219176 and AY219177, respectively) [19]. Allele*1 differs from allele*2 in that it contains only one copy of a 19-bp sequence in the first exon, whereas this sequence is duplicated and tandemly arranged in allele*2 ( Figure 1). Previous studies showed that the LAPTM4B *2/2-type allele was significantly associated with the susceptibility of adenocarcinoma including lung cancer [20], gastric cancer [21], colorectal cancers [22], cervical cancer [23] and breast cancer [24], but not check in squamous cell carcinoma such as esophageal carcinoma, rectum carcinoma [22], and nasopharyngeal carcinoma [25]. However, the origin of melanocytes is unique: derived from the neural crest cells. Whether its malignant tumor associated with LAPTM4B gene polymorphism or not is still unclear. Therefore, a case–control study was designed to investigate the relationship between LAPTM4B gene polymorphism and melanoma developing

in Chinese patients. Two hundred twenty Chinese melanoma cases who were hospitalized in at Beijing Cancer Hospital were collected. The diagnosis of melanoma was based on the criteria of tumor, node, metastasis (TNM) classification system formulated by American Joint Committee on Cancer (AJCC 7th edition, 2010). Final diagnosis of all patients was confirmed by pathologic investigations. Patient clinicopathologic features include gender, age, tumor primary lesions, microscopic depth of tumor invasion (Clark level or Breslow’s depth), ulceration status and gene mutation (C-KIT and BRAF). All patients consented in writing to participate in the study. This study was approved by the medical ethics committee of the Beijing Cancer Hospital and Institute and was conducted according to the Declaration of Helsinki Principles. A total of 617 controls were quoted from the healthy adult data of Cheng [22] and Wang [25].

However, regardless of the significant role of this brain region

However, regardless of the significant role of this brain region in eating behavior, the activation of the SMA could simply be the result of the participants’ awareness of the difference between the suppression and motivation tasks—during the suppression sessions, it was necessary for the participants to concentrate on suppressing their motivation to eat the pictured food items, whereas during the motivation sessions they allowed to have their natural appetitive motivation. Forskolin On the other hands, the DLPFC is well known to play important roles in cognitive

control systems that orchestrate thoughts, emotions, and actions in accordance with internal goals (Carter and van Veen, 2007, Miller and Cohen, 2001 and Ochsner and Gross, 2005). Such a role of the DLPFC could also extend to eating behaviors under the cognitive regulation of the motivation to eat, as observed in previous studies (Hollmann et al., 2012 and Kober

et al., 2010). Collectively, the present findings using MEG support the importance of the left DLPFC and SMA, particularly the DLPFC, in the cognitive regulation of motivation to eat. Previous studies regarding cognitive regulation of eating behavior observed hemodynamic changes in response to food stimuli using fMRI (Hare et al., 2009 and Hollmann et al., 2012). In the present study, the electrical activity related to the suppression of motivation to eat was first assessed using MEG, and its high temporal resolution enables assessment of the time course of brain activities when participants PD332991 concentrate on suppressing their motivation to eat. In the present analysis, the latency of significant brain activity in the SMA was 200–300 ms, whereas that in the DLPFC was 500–600 ms after the presentation of the food picture. One possible explanation why the occurrence

of the activity in SMA preceded that in DLPFC is that sensory information of visual food stimuli is sent from the sensory area to the SMA in advance, and then transmitted to the DLPFC. The input from the SMA to the DLPFC might in turn Ergoloid provide the resource for the subsequent suppressive signals from the DLPFC. In addition, a previous study using similar instruction during brain scanning showed significant activation of the striatal-DLPFC pathway in the regulation of craving in response to various kinds of affective cues, such as highly rewarding food cues (Kober et al., 2010). Due to the spatial disadvantages of MEG analyses, however, we could not examine the involvement of the striatum in the present study setting. Accordingly, further studies will be needed to examine the temporal relationship of the interplay among multiple brain areas, including regions other than the DLPFC and SMA. Furthermore, the time–frequency analyses were performed and significant results were obtained in terms of ERS and ERD.

Before the surgical procedure, we used the 18F flexible cystoscop

Before the surgical procedure, we used the 18F flexible cystoscope working channel (CYF-2, Olympus Keymed, UK) to examine the location and number of tumors. Patients with larger tumors were examined by cystography. A preprocedural dual-source CT system (Somatom Definition, Siemens Medical Systems, Forchheim, Germany) was employed to assist in the planning of the CT-guided cryoablation treatment

and to serve as the baseline with which postablation CT could be compared. An oral contrast agent in CT imaging was administrated for all patients with bladder cancer, and a three-cavity indwelling catheter was inserted in patients before surgery. Intraoperatively, an intravenous contrast agent for bladder was administered, and the bladder was irrigated with warm water. A catheter HSP cancer was inserted in patients 2–4 weeks after cryoablation. Percutaneous cryotherapy was performed using a cryoablation system (Cryo-hit, Galil Medical, Israel; employing argon/helium gases using 1.47 mm needles), including as many as 25 cryoprobes (Fig 1). Interventional guidance and monitoring for cryotherapy were performed using a CT system scanner. All 32 patients underwent argon–helium cryoablation during a single procedure, expect for two who were re-treated. Procedures were performed after induction of local anesthesia in the patients. All 34 tumors were treated by an argon/helium gases-based Cryo-hit system and cryoprobes.

According to the size and position of the tumor, a single or multiple 1.47 mm cryoprobes were used to freeze the target BIBW2992 cell line bladder tumor with a dual freeze–thaw cycle (10-min freeze, 5-min thaw) under CT guidance. In general, one cryoprobe generates Farnesyltransferase an ice ball that is 3 cm in diameter and 5 cm in length along the probe shaft [3].The iceball’s dimensions were monitored via intraoperative CT. The rapid expansion of argon gas in a sealed cryoprobe with a distal uninsulated portion resulted in rapid freezing of tumor tissue, and cryoprobe tip temperatures reached a nadir of approximately −140 °C within seconds. Thawing was

accomplished by replacing the argon gas with helium gas. Tumor freezing was monitored; if the ice ball did not encompass the tumor entirely, additional cryoprobes were placed. CT imaging was performed 24 h after cryoablation to document technical success, assessment of complications, such as bleeding or urinary fistula formation, and provide a baseline for future follow-up imaging and pretreatment CT. Follow-up images with CT were obtained at 3, 6, 12, 18, 24, 36 and 48 months after cryoablation. Tumors were considered completely ablated if there was no evidence to suggest tumor enhancement by intravenous contrast material [3]. Data for 32 patients are shown in Table 1. All patients were from China. The images from CT and cystoscopic views revealed that all 32 patients suffered from muscle-invasive bladder cancer (clinical staging T2-T4aN0M0).

10 or close values); (ii) Analysis of Variance (ANOVA); and (iii)

10 or close values); (ii) Analysis of Variance (ANOVA); and (iii) Response Surface Methodology. Breads produced can be seen in Fig. 1. Bread specific volume was determined after cooling, on the same day as processing. The values for specific volume of the breads

produced according to the experimental design varied from 5.65 to 6.53 mL/g, with 5.80 mL/g for the Control. It was verified that the Control bread presented specific volume within the range found for the breads of the experimental design. Actually, only Assay 5, without the addition of SSL, presented lower specific volume (5.65 mL/g) than the Control. The importance of this emulsifier can be observed in the Response Surface (Fig. 2), generated by the mathematical model (Table 2) obtained from the experimental data. A greater effect of the emulsifier can be observed in relation to click here the enzyme, nevertheless it can be noted that both SSL and MALTO had a positive effect on specific volume. The effect of SSL is probably due to its action as a dough strengthener. Dough strengthener emulsifiers are capable of forming liquid films of lamellar structure at the interface between gluten and starch. They improve the ability of gluten to form a film that retains the gas

produced by the yeast (Krog, 1981), that consequently proportioned an increase in volume. The effect of MALTO is due to the presence of fungal α-amylase in its composition, which supplies fermentable sugars for yeast growth

and gas production Dimethyl sulfoxide mainly before the baking stage (Wong & Robertson, 2002). Also, selleck screening library amylase functionality in the increase of specific volume may also be related to the reduction of dough viscosity during starch gelatinization, thus prolonging oven rise (Goesaert, Slade, Levin, & Delcour, 2009). However, it was observed that Assay 5, with the presence of 0.20 g MALTO/100 g flour and possibly an additional supply of fermentable sugars for gas production, did not present an increase in bread specific volume when compared to the Control, possibly due to the small amounts used. It can also be observed, through Fig. 2, that varying the quantities of MALTO up to approximately 0.025 g/100 g flour has practically no effect on volume. This is also true for SSL, where the effect of the emulsifier is only observed at concentrations above 0.25 g/100 g flour. That is, there is a minimum amount of this additive (SSL) or processing aid (MALTO) that must be added to have an effect on specific volume. This might be because these compounds are not pure, but diluted with starch or other ingredients. Another important observation is that, using higher quantities of SSL, close to 0.50 g/100 g flour, the quantity of MALTO (maltogenic amylase) had little effect on specific volume.

Constant monitoring was given to ensure the safety of the mice [1

Constant monitoring was given to ensure the safety of the mice [17]. Sedentary mice were placed MG-132 clinical trial in water tanks for 5 min daily to mimic the water stress. Twenty four hours after the last session of swimming exercise mice were killed by decapitation and the trunk blood

was rapidly collected into chilled polypropylene tubes containing guanidine thiocyanate and centrifuged, as described previously [42]. Simultaneously, the heart was excised and dissected onto ice. Left ventricle (LV) was weighted and divided in three transversal portions: base, median and apex. Base and apex were snapped frozen and the median segment of LV was processed for histology. Total blood and LV segments were kept in −80 °C until assayed.

Total RNA from the apex segment of the LV was prepared using TRIzol reagent (Invitrogen, San Diego, CA), treated with DNAse, and reverse transcribed with MML-V (Moloney murine leukemia virus) (Invitrogen) [43]. The endogenous HPRT – hypoxanthine guanine phosphoribosyltransferase (internal control), collagen I, collagen III, fibronectin, angiotensin converting enzyme (ACE), ACE 2 and AT1 receptor cDNA were amplified using specific primers (Table 1) and SYBR green reagent (Applied Biosystems) in an ABI Prism 7000 platform (Applied Biosystems). The relative comparative CT method of Livak and Schmittgen was applied to compare gene expression levels between groups, using the equation check 2−ΔΔCT[29]. Median LV segment was fixed click here in Bouin solution (4% at 4 °C) for 24 h, washed with water and maintained in 70% ethanol overnight. Subsequently, tissue was embedded in paraffin, sectioned (5 μm) and stained with hematoxylin and eosin. Images from 3 slides of each animal were captured and cardiac fibers from at least 150 cells of each group were measured using LC Evolution/Olympus

Bx50 using a 40× objective. Cardiomyocytes were analyzed only from longitudinal fibers with well defined central nucleus. The segment from the base of the LV was homogenized in 4 mol/L of guanidine thiocyanate/1% trifluoroacetic acid (vol/vol; 5 ml for each tissue) in water and then processed as described previously [8] and [36]. Blood and LV peptides were extracted onto bond-elut phenylsilane cartridges (Varian) and Ang-(1–7) and Ang II immunoreactivity (ir) was measured by radioimmunoassay, as described previously by Botelho et al. [7]. Data are expressed as mean ± SE. Comparisons between two observations in the same animal or two groups were performed by Student t-test paired or not paired, respectively. Differences among more than 2 groups were assessed by two-way ANOVA followed by the Bonferroni test. The statistical analysis was performed with GraphPad Prism software (version 4.0), and the level of significance was set at p < 0.05. As observed in Table 1, sedentary WT mice gained weight during the 6 weeks period (36.0 ± 0.

To determine potential effects of YAP knockdown on the former of

To determine potential effects of YAP knockdown on the former of these cellular functions in ccRCC, replating efficiency assays were performed using single cell suspensions. Of note, the ability of ACHN-YAP-shRNA#4 cells to form colonies from single cells in this setting was significantly reduced compared to mock-transduced ACHN controls (mean reduction of colony counts by 66.3 ± 0.05%, n = 6, P <

.0001; Figure 4A). Of interest, the colonies formed by YAP knockdown cells were not only less numerous but also smaller in size, reflecting reduced in vitro net cell growth as already observed previously in MTS assays. Anchorage-independent growth and colony formation in soft agar is a widely accepted in vitro surrogate phenotype for malignant transformation. YAP knockdown potently and reproducibly abrogated anchorage-independent growth of ACHN cells in soft agar (reduction of colony counts by more than 90 ± 0.02%, n = AZD8055 datasheet 6, P < .0001; Figure 4B). Similar to what was seen in replating assays, the remaining colonies formed by ACHN-YAP-shRNA mass clones were not only

sparse in number but also significantly smaller compared to their mock-transduced counterparts in this three-dimensional culture setting. On the basis of these encouraging in vitro data suggesting a dependency of ccRCC cells on signaling through the Hippo pathway for maintenance of a malignant phenotype, we next tried to assess the Epacadostat in vivo relevance of this Tryptophan synthase finding using a subcutaneous xenograft model. Male athymic CD1nu/nu nude mice, 6 to 8 weeks of age, were injected subcutaneously with 2.5 × 106 ACHN-YAP-shRNA or ACHN mock cells into both flanks. Tumor volumes were assessed weekly using digital calipers starting 1 week after injection. Of note, xenograft growth of ACHN-YAP-shRNA cells was significantly delayed compared to ACHN mock controls (P = .0182; Figure 6, A, left panel, and B), while at the same time the overall body mass of xenograft-bearing mice was not significantly

altered between the two study arms ( Figure 6A, right panel). At 5 weeks after injection, mice were sacrificed, and tumors were harvested for histopathologic and immunohistochemical evaluation or snap-frozen for mRNA extraction and subsequent real-time RT-qPCR analysis, respectively. cDNA microarray analysis of MZ1774 YAPshRNA mass clones revealed 14 genes that were upregulated more than two-fold (Table 2) and another 42 genes that were downregulated by more than 50% compared to mock-transfected MZ1774 cells (Table 3). Of these, eight targets were picked for validation by real-time qPCR. All of those eight targets found to be downregulated by microarray analysis were confirmed to be downregulated using RT-qPCR, and CDH6 as an example of a target found to be overexpressed in the microarray analysis was also found to be upregulated using RT-qPCR (Figure 5A).

The Picro-carmin stain allows identifying various white matter la

The Picro-carmin stain allows identifying various white matter layers with the naked eye and the nuclei can be seen under the microscope. Structures that are usually coloured dark and blue by Pal’s stain are stained yellow by picro-carmin. What appears light and brown using Pal is reddish with picro-carmin. The drawback is that in brain tissue, unlike peripheral nerves or cord, the axonal cones are not distinctly stained in red; therefore the individual fibres cannot be differentiated. Note: When using Pal’s stain for large specimens, such as a section of the whole

hemisphere, a multitude of stratagems are required and negligence of each of them endangers the final result. I shall therefore carefully describe the method below. The brain is removed from the skull as soon as possible after death, ideally Endocrinology antagonist in the winter and then preserved in Müller solution as a whole or only cut in halves (to avoid losing its shape). In the first few days, the solution needs daily changing. The specimen is ready to be cut after three to four months. Slices, cut as thin as the microtome allows, are dried by soaking them in diluted alcohol and pure alcohol, each for a period of 24 hours. Slices are then immersed in celloidin solution

and stuck to wooden plates. For the sections I used the largest Schanz microtome and an especially designed heavy knife. I did not cut under spiritus. Slices of 1/10mm thickness can be picked and transported PD0325901 easily if not yet stained.

If the brain is rather crumbly, the surface can be covered with collodium or celliodin by dripping on a thin layer of the solution prior to each cut. The slices are placed –without aminophylline copper– in water for 24 hours and subsequently in a 1% haematoxylin solution (Haematoxylin 1, alcoh. Abs 5, of which 5 ccm onto 100ccm water and 1 ccm saturated lithium carbonium solution) for the same length of time. One can simultaneously stain 10 or 20 slices in a large amount of solution, but the same solution cannot be used twice. The slices are then washed with plenty of water and de-stained; it is best to let them soak in water for a period of 24 hours. They can, however, be left in water for longer without any concern; in which case the slices only de-stain faster. The individual slice is then placed onto a glass plate or in a glass dish with fatty margins and is poured onto with a 0.5-1% manganese-rich acidic potassium solution and gently turned around multiple times. The solution has to be changed repeatedly and is only actively de-staining as long as it shimmers bluish when held against a white paper. As soon as the blue colour is changing towards violet, the solution does not de-stain any longer. On the contrary, it rather stains permanently brown.

Kevin C Huoh and Kristina W Rosbe Infantile hemangiomas (IHs) a

Kevin C. Huoh and Kristina W. Rosbe Infantile hemangiomas (IHs) are benign vascular tumors. Clinical history and physical examination are the most important factors for diagnosis, with most IHs having a typical presentation. Treatment is required for some IHs that cause

significant cosmetic deformity or functional compromise. Propranolol is the first-line treatment of most IHs. Ongoing research is increasing our understanding of the pathophysiology of these tumors and should help to identify future potential therapeutic targets. Johana B. Castro Wagner and Harold S. Pine Video of cough caused by Bordetella pertussis in a child accompanies this article The management of chronic cough, a common complaint in children, is

challenging for Venetoclax cell line most health care professionals. Millions of dollars are spent every year on unnecessary testing and treatment. A rational approach based on a detailed interview and a thorough physical examination guides further intervention and management. Inexpensive and simple http://www.selleckchem.com/HSP-90.html homemade syrups based on dark honey have proved to be an effective measure when dealing with cough in children. Kedar Kakodkar and James W. Schroeder Jr Feeding and swallowing disorders in the pediatric population are becoming more common, particularly in infants born prematurely and in children with chronic medical conditions. The normal swallowing mechanism is divided into 4 stages: the preparatory, the oral, the pharyngeal, and the esophageal phases. Feeding disorders have multiple causes: medical, nutritional, behavioral, psychological, and environmental factors can all contribute.

Pathologic conditions involving any of the anatomic sites associated with the phases of swallowing can negatively impact the coordination of these phases and lead to symptoms of dysphagia and feeding intolerance. Austin S. Rose, Brian D. Thorp, Adam M. Zanation, and Charles S. Ebert Jr Chronic rhinosinusitis (CRS) affects nearly 37 million people in the United States each year and accounts for approximately $6 billion in direct and indirect health care costs. Despite its prevalence ADP ribosylation factor and significant impact, little is known about its exact cause and pathophysiology, and significant controversy remains regarding appropriate treatment options. Basic science research, however, has shown recent promise toward improving understanding of the innate and environmental factors underlying the pathophysiology of CRS. The hope is that this will also lead to advances in treatment for children adversely affected by this common yet complicated disease. Oren Cavel, Chantal Giguere, Annie Lapointe, Arielle Levy, Francoise Yung, Chantal Hickey, and Patrick Froehlich Video of simulated pediatric airway performance accompanies this article Training in the management of pediatric airway cases has been limited by the number of cases and by the involved risks to the child.