A fully automatic method for segmentation of soccer playing fields

This paper proposes a strategy to segment the playing field in soccer images, suitable for integration in many soccer image analysis applications. The combination of a green chromaticity-based analysis and an analysis of the chromatic distortion using full-color information, both at the pixel-level, allows segmenting the green areas of the images. Then, a fully automatic post-processing block at the region-level discards the green areas that do not belong to the playing field. The strategy has been evaluated with hundreds of annotated images from matches in several stadiums with different grass shades and light conditions. The results obtained have been of great quality in all the images, even in those with the most complex lighting conditions (e.g., high contrast between sunlit and shadowed areas). In addition, these results have improved those obtained with leading state-of-the-art playing field segmentation strategies.

Exposure to Multiple Forms of Bias Victimization on Youth and Young Adults: Relationships with Trauma Symptomatology and Social Support

Research has documented that a significant portion of youth are exposed to bias victimization. However, less is known about whether experiencing certain types of bias victimization (e.g., sexual orientation bias) is more or less likely to be related to a more extensive bias victimization history (i.e., experiencing multiple types of bias victimization) and whether exposure to multiple types of bias victimization explains any relationships between specific types of bias victimization and negative outcomes. To address these gaps, the current study explores relationships between exposure to multiple types of bias-motivated victimization, trauma symptomatology and perceived social support. Participants were 854 youth and young adults (60.9% female) from three higher risk communities who completed a survey on personal experiences with bias-related victimization. The average age of participants was 16.6 years; 28.5% of the sample described themselves as Black or African American; 13.4% as Hispanic or Latino (any race); 45.3% as White, and 12.8% as another race. Sixty-nine percent of the sample described their sexual orientation as heterosexual; 8.9% as gay, lesbian, or homosexual; 12.5% as bisexual; and 9.5% as another sexual orientation. Sixty-three percent of participants reported at least one type of bias victimization in their lifetime, and more than one in three youth (38.7%) experienced two or more types of bias victimization in their lifetimes (18.1% two types, 12.1% three types, and 8.5% four or more types). Experiencing multiple types of bias victimization was related to higher trauma symptomatology and less perceived social support. Experiencing multiple types of bias victimization attenuated or eliminated the association between individual types of bias victimization and well-being. The findings contribute to a growing body of research demonstrating the damaging mental health effects of occupying multiple marginalized statuses, and points to the cumulation of bias victimization experiences as an important factor contributing to significant differences in well-being and support among youth and young adults.

Development of a new method for the quantitation of metabolites in the absence of chemically synthetized authentic standards

A new method for the quantification of metabolites in the absence of a chemically synthetized authentic standard is described herein. Metabolites to be used as reference standards were obtained biologically from microsomes incubation. The method is a stepwise process in which, only the radiolabeled (¹⁴C) and non-radiolabeled parent compound are required. Briefly, the separation and principles of equimolar detection of LC-radioactivity were applied and, a calibration curve of the ¹⁴C-parent compound was used to quantify the formation of its ¹⁴C-metabolite. In turn, serial dilutions of this ¹⁴C-metabolite were the base for the calibration curve that allowed the quantification of the non-radiolabeled metabolite. This method was applied in plasma samples obtained from a dog pharmacokinetic study in which, a PharmaMar compound (lurbinectedin) and its N-desmethylated metabolite were quantified and, the results compared to those obtained by the classical approach (with the chemically synthetized N-desmethylated metabolite). Plasma concentrations obtained with the two methods were very similar, with standard relative errors between -11% to -4%. Similar, main pharmacokinetic parameters were calculated with the concentrations obtained either thru this method or by using a chemically synthetized authentic standard.

Autophagy protects against neural cell death induced by piperidine alkaloids present in Prosopis juliflora (Mesquite)

Prosopis juliflora is a shrub that has been used to feed animals and humans. However, a synergistic action of piperidine alkaloids has been suggested to be responsible for neurotoxic damage observed in animals. We investigated the involvement of programmed cell death (PCD) and autophagy on the mechanism of cell death induced by a total extract (TAE) of alkaloids and fraction (F32) from P. juliflora leaves composed majoritary of juliprosopine in a model of neuron/glial cell co-culture. We saw that TAE (30 µg/mL) and F32 (7.5 µg/mL) induced reduction in ATP levels and changes in mitochondrial membrane potential at 12 h exposure. Moreover, TAE and F32 induced caspase-9 activation, nuclear condensation and neuronal death at 16 h exposure. After 4 h, they induced autophagy characterized by decreases of P62 protein level, increase of LC3II expression and increase in number of GFP-LC3 cells. Interestingly, we demonstrated that inhibition of autophagy by bafilomycin and vinblastine increased the cell death induced by TAE and autophagy induced by serum deprivation and rapamycin reduced cell death induced by F32 at 24 h. These results indicate that the mechanism neural cell death induced by these alkaloids involves PCD via caspase-9 activation and autophagy, which seems to be an important protective mechanism.

The Reliability of a Standardized Reporting System for the Diagnosis of Appendicitis

PURPOSE

Computed tomography (CT) is a fast and ubiquitous tool to evaluate intra-abdominal organs and diagnose appendicitis. However, traditional CT reporting does not necessarily capture the degree of uncertainty and indeterminate findings are still common. The purpose of this study was to evaluate the reproducibility of a standardized CT reporting system for appendicitis across a large population and the system's impact on radiologists' certainty in diagnosing appendicitis.

METHODS

Using a previously described standardized reporting system, eight radiologists retrospectively evaluated CT scans, blinded to all clinical information, in a stratified random sample of 237 patients from a larger cohort of patients imaged for possible appendicitis (2010-2014). Receiver operating characteristic (ROC) curves and the area under the ROC curve (AUC) were used to evaluate the diagnostic performance of readers for identifying appendicitis. Two-thirds of these scans were randomly selected to be independently read by a second reader, using the original CT reports to balance the number of positive, negative and indeterminate exams across all readers. Inter-reader agreement was evaluated.

RESULTS

There were 113 patients with appendicitis (mean age 38, 67% male). Using the standardized report, radiologists were highly accurate at identifying appendicitis (AUC=0.968, 95%CI confidence interval: 0.95, 0.99. Inter-reader agreement was >80% for most objective findings, and certainty in diagnosing appendicitis was high and reproducible (AUC=0.955 and AUC=0.936 for the first and second readers, respectively).

CONCLUSIONS

Using a standardized reporting system resulted in high reproducibility of objective CT findings for appendicitis and achieved high diagnostic accuracy in an at-risk population. Predictive tools based on this reporting system may further improve communication about certainty in diagnosis and guide patient management, especially when CT findings are indeterminate.

Detection of Stationary Foreground Objects Using Multiple Nonparametric Background-Foreground Models on a Finite State Machine

There is a huge proliferation of surveillance systems that require strategies for detecting different kinds of stationary foreground objects (e.g., unattended packages or illegally parked vehicles). As these strategies must be able to detect foreground objects remaining static in crowd scenarios, regardless of how long they have not been moving, several algorithms for detecting different kinds of such foreground objects have been developed over the last decades. This paper presents an efficient and high-quality strategy to detect stationary foreground objects, which is able to detect not only completely static objects but also partially static ones. Three parallel nonparametric detectors with different absorption rates are used to detect currently moving foreground objects, short-term stationary foreground objects, and long-term stationary foreground objects. The results of the detectors are fed into a novel finite state machine that classifies the pixels among background, moving foreground objects, stationary foreground objects, occluded stationary foreground objects, and uncovered background. Results show that the proposed detection strategy is not only able to achieve high quality in several challenging situations but it also improves upon previous strategies.

Augmented Reality Tool for the Situational Awareness Improvement of UAV Operators

Unmanned Aerial Vehicles (UAVs) are being extensively used nowadays. Therefore, pilots of traditional aerial platforms should adapt their skills to operate them from a Ground Control Station (GCS). Common GCSs provide information in separate screens: one presents the video stream while the other displays information about the mission plan and information coming from other sensors. To avoid the burden of fusing information displayed in the two screens, an Augmented Reality (AR) tool is proposed in this paper. The AR system has two functionalities for Medium-Altitude Long-Endurance (MALE) UAVs: route orientation and target identification. Route orientation allows the operator to identify the upcoming waypoints and the path that the UAV is going to follow. Target identification allows a fast target localization, even in the presence of occlusions. The AR tool is implemented following the North Atlantic Treaty Organization (NATO) standards so that it can be used in different GCSs. The experiments show how the AR tool improves significantly the situational awareness of the UAV operators.

Optimal Piecewise Linear Function Approximation for GPU-Based Applications

Many computer vision and human-computer interaction applications developed in recent years need evaluating complex and continuous mathematical functions as an essential step toward proper operation. However, rigorous evaluation of these kind of functions often implies a very high computational cost, unacceptable in real-time applications. To alleviate this problem, functions are commonly approximated by simpler piecewise-polynomial representations. Following this idea, we propose a novel, efficient, and practical technique to evaluate complex and continuous functions using a nearly optimal design of two types of piecewise linear approximations in the case of a large budget of evaluation subintervals. To this end, we develop a thorough error analysis that yields asymptotically tight bounds to accurately quantify the approximation performance of both representations. It provides an improvement upon previous error estimates and allows the user to control the tradeoff between the approximation error and the number of evaluation subintervals. To guarantee real-time operation, the method is suitable for, but not limited to, an efficient implementation in modern graphics processing units, where it outperforms previous alternative approaches by exploiting the fixed-function interpolation routines present in their texture units. The proposed technique is a perfect match for any application requiring the evaluation of continuous functions; we have measured in detail its quality and efficiency on several functions, and, in particular, the Gaussian function because it is extensively used in many areas of computer vision and cybernetics, and it is expensive to evaluate.

Glutamine Synthetase Immunoreactivity in Peritumoral Hyperplasia in Liver: Case Report of a Metastatic Paraganglioma With Focal Nodular Hyperplasia-Like Changes and Review of an Additional 54 Liver Masses

OBJECTIVES

Focal nodular hyperplasia (FNH) and peritumoral hyperplasia in the liver exhibit increased immunoreactivity for glutamine synthetase (GS). We observed FNH-like changes with map-like GS staining surrounding a metastatic paraganglioma and sought to determine how often such changes occur around primary and metastatic liver lesions.

METHODS

We performed GS immunohistochemistry in liver cases of 20 metastatic neuroendocrine carcinomas (NECs), 21 metastatic colon carcinomas (CCs), seven hepatocellular carcinomas (HCCs), and six FNHs and assessed lesions for size, degree of fibrosis (scored 1-3), and peritumoral hyperplasia.

RESULTS

Most NEC or CC cases had few peritumoral hyperplastic features. Three NECs, two CCs, and one HCC (13%) had patchy GS staining at the periphery of the lesions. One CC case had both histologic and immunohistochemical peritumoral hyperplasia.

CONCLUSIONS

Peritumoral hyperplasia or FNH-like changes are uncommon findings around primary or metastatic lesions in the liver. GS immunohistochemistry assists in distinguishing true peritumoral hyperplasia from mass effect.

Production of Highly Polarized Positrons Using Polarized Electrons at MeV Energies

The Polarized Electrons for Polarized Positrons experiment at the injector of the Continuous Electron Beam Accelerator Facility has demonstrated for the first time the efficient transfer of polarization from electrons to positrons produced by the polarized bremsstrahlung radiation induced by a polarized electron beam in a high-Z target. Positron polarization up to 82% have been measured for an initial electron beam momentum of 8.19  MeV/c, limited only by the electron beam polarization. This technique extends polarized positron capabilities from GeV to MeV electron beams, and opens access to polarized positron beam physics to a wide community.

Hiatal Herniation After Transhiatal Esophagectomy: an Underreported Complication

INTRODUCTION

The incidence and presentation of hiatal hernias after esophagectomy (HHAE) are not well characterized, and may be changing with increased survival from esophageal cancer. The aims of this study were to define the incidence and presentation of HHAE in our population of patients undergoing transhiatal esophagectomy (THE), as it may have implications for management.

METHODS

A retrospective cohort study (2004-2013) was performed of esophageal cancer patients who underwent THE. To determine the presence or absence of HHAE independent of the original radiology report, a radiologist sub-specializing in body imaging independently reviewed post-operative computed tomography images. A time-to-event competing risk analysis was performed to estimate the cumulative incidence of HHAE.

RESULTS

Among 192 patients, the two-year cumulative incidence of HHAE was 14 % (95 % confidence interval 7.5-21 %). Of the 22 patients determined to have HHAE by independent expert radiologist review, only 11 (50 %) were identified by the original interpreting radiologist. Seven patients were symptomatic, and each underwent hiatal hernia repair (4 via laparotomy, 3 via laparoscopy).

CONCLUSION

HHAE is not rare and is often unrecognized. As more patients with esophageal cancer survive, the number of patients becoming symptomatic and requiring repair may also rise. Therefore, it is important to consider this diagnosis when following patients long-term after esophagectomy.

Abstract IA38: Engineered T cell-receptor based therapy of pancreatic ductal adenocarcinoma

Pancreatic ductal adenocarcinoma (PDA) presents a formidable challenge for effective therapies given the robust desmoplasia, immunosuppressive elements and relatively few coding mutations characteristic of this disease. We demonstrate the safety and therapeutic activity of T cells engineered to express an affinity-enhanced T cell receptor (TCR) targeting the naturally overexpressed self/tumor antigen Mesothelin in an autochthonous, genetically engineered mouse model of PDA (KPC). Notably, despite the hostile tumor microenvironment surrounding PDA, the engineered T cells readily infiltrate the desmoplastic tumor, induce tumor cell lysis and remodel the tumor extracellular matrix without causing detectable toxicity in normal tissues. The transferred T cells persist in PDA, but antitumor activity is transient, as the tumor-infiltrating donor T cells upregulate a panel of inhibitory receptors and become progressively dysfunctional specifically in PDA that is due to both TCR-dependent and independent mechanisms of inhibition. This obstacle to sustained therapeutic activity can be overcome by serial T cell infusions, which mediate objective responses and a near doubling of KPC survival without overt toxicities. Similarly engineered human T cells recognize and lyse PDA cells in vitro, further supporting the clinical advancement of this TCR-based strategy for the treatment of human PDA.

Citation Format: Ingunn M. Stromnes, Thomas M. Schmitt, Scott J. Brockenbrough, Hieu Nguyen, Carlos Cuevas, Ayaka Hulbert, Jennifer Hotes, Ashley Dotson, Sunil R. Hingorani, Philip D. Greenberg. Engineered T cell-receptor based therapy of pancreatic ductal adenocarcinoma. [abstract]. In: Proceedings of the CRI-CIMT-EATI-AACR Inaugural International Cancer Immunotherapy Conference: Translating Science into Survival; September 16-19, 2015; New York, NY. Philadelphia (PA): AACR; Cancer Immunol Res 2016;4(1 Suppl):Abstract nr IA38.

T Cells Engineered against a Native Antigen Can Surmount Immunologic and Physical Barriers to Treat Pancreatic Ductal Adenocarcinoma

Pancreatic ductal adenocarcinomas (PDAs) erect physical barriers to chemotherapy and induce multiple mechanisms of immune suppression, creating a sanctuary for unimpeded growth. We tested the ability of T cells engineered to express an affinity-enhanced T cell receptor (TCR) against a native antigen to overcome these barriers in a genetically engineered model of autochthonous PDA. Engineered T cells preferentially accumulate in PDA and induce tumor cell death and stromal remodeling. However, tumor-infiltrating T cells become progressively dysfunctional, a limitation successfully overcome by serial T cell infusions that resulted in a near-doubling of survival without overt toxicities. Similarly engineered human T cells lyse PDA cells in vitro, further supporting clinical advancement of this TCR-based strategy for the treatment of PDA.

Abstract B74: Minimally invasive ablative therapy for mucinous cystic neoplasms (MCN) in a genetically engineered mouse model

Pancreatic cystic neoplasms are an increasing health problem in the adult population due to their inherent potential to progress to invasive adenocarcinomas. The only available treatment is resection with the consequential significant morbidity and mortality associated with pancreatic surgery. Direct percutaneous injection of an ablative substance represents a potential new approach to this problem. Limited studies performed in human subjects speak to the potential feasibility of this approach, but no systematic or rigorous assessment of agents and outcomes has been possible. We have undertaken an effort to evaluate the effectiveness of intracystic injections of different chemical ablative substances (including ethanol and sodium tetradecyl sulfate) or chemotherapeutic drugs (including gemcitabine and paclitaxel) for the treatment of mucinous cystic neoplasms (MCN) in a murine model of the disease. We have developed a genetically engineered mouse model of MCN (KrasLSL-G12D;Dpc4fl/fl;Cre) that recapitulates the prototypical features of the human correlate, including development of an ovarian-type stroma with estrogen receptor (ER) and progesterone receptor (PR)-positive cells. An MCN is first identified in the mouse with high-resolution ultrasound imaging (HRUS) and the cyst fluid aspirated; the cyst is then injected with one of the treatment regimens. Study feasibility was first established with image-guided India ink injections followed by necropsy to evaluate successful aspiration and injection. Following treatment, disease response is evaluated by serial HRUS and detailed histopathologic and molecular analyses on recovered tissues at study termination. Through these studies we hope to define the optimal therapeutic regimen for non-surgical management of MCN in anticipation of a future clinical trial. We have successfully identified, aspirated and injected MCN with either saline (control) or ablative substances under real time ultrasound guidance in a longitudinal cohort. Challenges to this approach are also discussed including the posterior localization of the treated lesions within the diffusely abnormal pancreas typically found in this animal model.

Citation Format: Carlos Cuevas, Ashley M. Dotson, Sunil R. Hingorani. Minimally invasive ablative therapy for mucinous cystic neoplasms (MCN) in a genetically engineered mouse model. [abstract]. In: Proceedings of the AACR Special Conference on Pancreatic Cancer: Innovations in Research and Treatment; May 18-21, 2014; New Orleans, LA. Philadelphia (PA): AACR; Cancer Res 2015;75(13 Suppl):Abstract nr B74.

Abstract A92: Murine clinical trials program

Enormous advances in the biomedical sciences have raised tenable hope of a new era of personalized medicine. Significant hurdles to realizing this goal include the inordinately high and evolving degree of genetic and biologic diversity in carcinomas, even within categories of defined organ and cell-type. In addition, the tissue culture and xenograft preclinical model systems that have been instrumental in elucidating fundamental principles of cancer biology do not recapitulate the essential geometry or tissue and stromal interactions encountered in the native disease. As a result, the ability to kill cancer cells in these contexts has had limited impact on treating the diseases in patients. Genetically engineered mouse models of pancreas cancer appear to encompass the biological diversity and complexity seen in patients. In addition to revealing important aspects of disease pathobiology, these model systems form the basis of a preclinical platform, the Murine Clinical Trials Program (MCTP), designed to accelerate the development and evaluation of early detection, chemoprevention and therapeutic strategies most likely to impact patients in the clinic. By screening these strategies in highly faithful animal surrogates for the human disease, we hope to rapidly identify and translate the most effective approaches to the clinic, while concomitantly defining the appropriate disease subtype-specific context in which to employ each application. Attempting to accomplish these aims by performing initial validation and optimization experiments directly in patients can slow progress by many years, if not preclude it altogether.

Treatment strategies are advanced through the MCTP in a systematic manner with defined endpoints and criteria (“Go/No-Go”) for each step. If these criteria are met in phase A (Pilot Study), they advance to Phase B (Full Survival Study). Strict enrollment criteria ensure the presence of invasive PDA (with or without metastatic disease) while also allowing sufficient time on investigational therapy to reveal potential resistance mechanisms, unanticipated secondary or off-target effects and delayed toxicities. Each of these aspects is described in detail in our presentation. Each new investigational agent in both the pilot and survival studies is analyzed in three arms: 1) agent alone; 2) agent + standard cytotoxic agent(s); 3) agent + cytotoxics + anti-stromal agent. In our standard approach, pilot studies enroll n=4-5 animals per agent. A 2-5 cm mass measurable by high-resolution ultrasound is required for enrollment. The standard 3 weeks ‘on’/1 week ‘off’ treatment regimen used routinely in patients is recapitulated in mice, together with a dose and route designed to be as similar as possible to that anticipated for human patients. Primary endpoints for pilot studies (1-2 cycles of treatment) include objective response and cellular effects including tumor cell apoptosis and proliferation, immune cell responses, changes in content and character of ECM components, vessel density and cross-sectional diameter, and so on. Results from pilot studies are used to determine whether a full survival study is warranted. Examples of recent MCTP pilot and survival studies will be presented.

Citation Format: J. Scott Brockenbrough, Libing Feng, Ingunn M. Stromnes, Kathleen E. DelGiorno, Martin C. Whittle, Carlos Cuevas, Ashley M. Dotson, Joseph S. Ryan, Shelley M. Thorsen, Sunil R. Hingorani. Murine clinical trials program. [abstract]. In: Proceedings of the AACR Special Conference on Pancreatic Cancer: Innovations in Research and Treatment; May 18-21, 2014; New Orleans, LA. Philadelphia (PA): AACR; Cancer Res 2015;75(13 Suppl):Abstract nr A92.

Tool for Semiautomatic Labeling of Moving Objects in Video Sequences: TSLAB

An advanced and user-friendly tool for fast labeling of moving objects captured with surveillance sensors is proposed, which is available to the public. This tool allows the creation of three kinds of labels: moving objects, shadows and occlusions. These labels are created at both the pixel level and object level, which makes them suitable to assess the quality of both moving object detection strategies and tracking algorithms. The labeling can be performed easily and quickly thanks to a very friendly graphical user interface that allows one to automatize many common operations. This interface also includes some semiautomatic advanced tools that simplify the labeling tasks and drastically reduce the time required to obtain high-quality results.

Multidisciplinary perspective of hepatocellular carcinoma: A Pacific Northwest experience

Hepatocellular carcinoma (HCC) is the most rapidly increasing type of cancer in the United States. HCC is a highly malignant cancer, accounting for at least 14000 deaths in the United States annually, and it ranks third as a cause of cancer mortality in men. One major difficulty is that most patients with HCC are diagnosed when the disease is already at an advanced stage, and the cancer cannot be surgically removed. Furthermore, because almost all patients have cirrhosis, neither chemotherapy nor major resections are well tolerated. Clearly there is need of a multidisciplinary approach for the management of HCC. For example, there is a need for better understanding of the fundamental etiologic mechanisms that are involved in hepatocarcinogenesis, which could lead to the development of successful preventive and therapeutic modalities. It is also essential to define the cellular and molecular bases for malignant transformation of hepatocytes. Such knowledge would: (1) greatly facilitate the identification of patients at risk; (2) prompt efforts to decrease risk factors; and (3) improve surveillance and early diagnosis through diagnostic imaging modalities. Possible benefits extend also to the clinical management of this disease. Because there are many factors involved in pathogenesis of HCC, this paper reviews a multidisciplinary perspective of recent advances in basic and clinical understanding of HCC that include: molecular hepatocarcinogenesis, non-invasive diagnostics modalities, diagnostic pathology, surgical modality, transplantation, local therapy and oncological/target therapeutics.

Imaging Techniques for the Diagnosis of Hepatocellular Carcinoma: A Systematic Review and Meta-analysis

BACKGROUND

Several imaging modalities are available for diagnosis of hepatocellular carcinoma (HCC).

PURPOSE

To evaluate the test performance of imaging modalities for HCC.

DATA SOURCES

MEDLINE (1998 to December 2014), the Cochrane Library Database, Scopus, and reference lists.

STUDY SELECTION

Studies on test performance of ultrasonography, computed tomography (CT), or magnetic resonance imaging (MRI).

DATA EXTRACTION

One investigator abstracted data, and a second investigator confirmed them; 2 investigators independently assessed study quality and strength of evidence.

DATA SYNTHESIS

Few studies have evaluated imaging for HCC in surveillance settings. In nonsurveillance settings, sensitivity for detection of HCC lesions was lower for ultrasonography without contrast than for CT or MRI (pooled difference based on direct comparisons, 0.11 to 0.22), and MRI was associated with higher sensitivity than CT (pooled difference, 0.09 [95% CI, 0.07 to 12]). For evaluation of focal liver lesions, there were no clear differences in sensitivity among ultrasonography with contrast, CT, and MRI. Specificity was generally 0.85 or higher across imaging modalities, but this item was not reported in many studies. Factors associated with lower sensitivity included use of an explanted liver reference standard, and smaller or more well-differentiated HCC lesions. For MRI, sensitivity was slightly higher for hepatic-specific than nonspecific contrast agents.

LIMITATIONS

Only English-language articles were included, there was statistical heterogeneity in pooled analyses, and costs were not assessed. Most studies were conducted in Asia and had methodological limitations.

CONCLUSION

CT and MRI are associated with higher sensitivity than ultrasonography without contrast for detection of HCC; sensitivity was higher for MRI than CT. For evaluation of focal liver lesions, the sensitivities of ultrasonography with contrast, CT, and MRI for HCC are similar.

PRIMARY FUNDING SOURCE

Agency for Healthcare Research and Quality. (

PROSPERO

CRD42014007016).

Glutathione transferase-M2-2 secreted from glioblastoma cell protects SH-SY5Y cells from aminochrome neurotoxicity

U373MG cells are able to take up aminochrome that induces glutathione transferase M2-2 (GSTM2) expression in a concentration-dependent manner where 100 µM aminochrome increases GSTM2 expression by 2.1-fold (P < 0.001) at 3 h. The uptake of (3)H-aminochrome into U373MG cells was significantly reduced in the presence of 2 µM nomifensine (P < 0.001) 100 µM imipramine (P < 0.001) and 50 mM dopamine (P < 0.001). Interestingly, U373MG cells excrete GSTM2 into the conditioned medium and the excretion was significantly increased (2.7-fold; P < 0.001) when the cells were pretreated with 50 µM aminochrome for 3 h. The U373MG-conditioned medium containing GSTM2 protects SH-SY5Y cells incubated with 10 µM aminochrome. The significant protection provided by U373MG-conditioned medium in SH-SY5Y cells incubated with aminochrome was dependent on GSTM2 internalization into SH-SY5Y cells as evidenced by (i) uptake of (14)C-GSTM2 released from U373MG cells into SH-SY5Y cells, a process inhibited by anti-GSTM2 antiserum; (ii) lack of protection of U373MG-conditioned medium in the presence of anti-GSTM2 antiserum on SH-SY5Y cells treated with aminochrome; and (iii) lack of protection of conditioned medium from U373MGsiGST6 that expresses an siRNA directed against GSTM2 on SH-SY5Y cells treated with aminochrome. In conclusion, our results demonstrated that U373MG cells protect SH-SY5Y cells against aminochrome neurotoxicity by releasing GSTM2 into the conditioned medium and subsequent internalization of GSTM2 into SH-SY5Y cells. These results suggest a new mechanism of protection of dopaminergic neurons mediated by astrocytes by releasing GSTM2 into the intersynaptic space and subsequent internalization into dopaminergic neuron in order to protect these cells against aminochrome neurotoxicity.

Targeted depletion of an MDSC subset unmasks pancreatic ductal adenocarcinoma to adaptive immunity

BACKGROUND

Pancreatic ductal adenocarcinoma (PDA) is characterised by a robust desmoplasia, including the notable accumulation of immunosuppressive cells that shield neoplastic cells from immune detection. Immune evasion may be further enhanced if the malignant cells fail to express high levels of antigens that are sufficiently immunogenic to engender an effector T cell response.

OBJECTIVE

To investigate the predominant subsets of immunosuppressive cancer-conditioned myeloid cells that chronicle and shape the progression of pancreas cancer. We show that selective depletion of one subset of myeloid-derived suppressor cells (MDSC) in an autochthonous, genetically engineered mouse model (GEMM) of PDA unmasks the ability of the adaptive immune response to engage and target tumour epithelial cells.

METHODS

A combination of in vivo and in vitro studies were performed employing a GEMM that faithfully recapitulates the cardinal features of human PDA. The predominant cancer-conditioned myeloid cell subpopulation was specifically targeted in vivo and the biological outcomes determined.

RESULTS

PDA orchestrates the induction of distinct subsets of cancer-associated myeloid cells through the production of factors known to influence myelopoiesis. These immature myeloid cells inhibit the proliferation and induce apoptosis of activated T cells. Targeted depletion of granulocytic MDSC (Gr-MDSC) in autochthonous PDA increases the intratumoral accumulation of activated CD8 T cells and apoptosis of tumour epithelial cells and also remodels the tumour stroma.

CONCLUSIONS

Neoplastic ductal cells of the pancreas induce distinct myeloid cell subsets that promote tumour cell survival and accumulation. Targeted depletion of a single myeloid subset, the Gr-MDSC, can unmask an endogenous T cell response, disclosing an unexpected latent immunity and invoking targeting of Gr-MDSC as a potential strategy to exploit for treating this highly lethal disease.

Glutathione transferase mu 2 protects glioblastoma cells against aminochrome toxicity by preventing autophagy and lysosome dysfunction

U373MG cells constitutively express glutathione S-transferase mu 2 (GSTM2) and exhibit (3)H-dopamine uptake, which is inhibited by 2 µM of nomifensine and 15 µM of estradiol. We generated a stable cell line (U373MGsiGST6) expressing an siRNA against GSTM2 that resulted in low GSTM2 expression (26% of wild-type U373MG cells). A significant increase in cell death was observed when U373MGsiGST6 cells were incubated with 50 µM purified aminochrome (18-fold increase) compared with wild-type cells. The incubation of U373MGsiGST6 cells with 75 µM aminochrome resulted in the formation of autophagic vacuoles containing undigested cellular components, as determined using transmission electron microscopy. A significant increase in autophagosomes was determined by measuring endogenous LC3-II, a significant decrease in cell death was observed in the presence of bafilomycin A 1, and a significant increase in cell death was observed in the presence of trehalose. A significant increase in LAMP2 immunostaining was observed, a significant decrease in bright red fluorescence of lysosomes with acridine orange was observed, and bafilomycin A 1 pretreatment reduced the loss of lysosome acidity. A significant increase in cell death was observed in the presence of lysosomal protease inhibitors. Aggregation of TUBA/α-tubulin (tubulin, α) and SQSTM1 protein accumulation were also observed. Moreover, a significant increase in the number of lipids droplets was observed compared with U373MG cells with normal expression of GSTM2. These results support the notion that GSTM2 is a protective enzyme against aminochrome toxicity in astrocytes and that aminochrome cell death in U373MGsiGST6 cells involves autophagic-lysosomal dysfunction.

Optical coherence tomography: from research to clinical application

Optical coherence tomography (OCT) has revolutionized intracoronary imaging. The unprecedented spatial resolution of this technique (15 μm) provides unique insights on the microstructure of the coronary wall. Currently, OCT is increasingly used in clinical practice and also constitutes an emerging, highly robust, research tool. OCT allows detailed visualization of atherosclerotic plaques and provides reliable information on plaque composition (lipid, fibrous, calcified) although its limited tissue penetration usually precludes a comprehensive analysis of the total plaque burden. OCT is the only technique allowing accurate measurements of the thickness of the fibrous cap, a classical marker of plaque vulnerability, and readily detects thin-cap fibroatheromas. In patients with acute coronary syndromes, plaque ruptures, with associated red or white thrombus, are nicely identified. OCT is also valuable to assess the results of coronary interventions. Stent expansion can be easily ascertained. In addition, due to its 10-times higher resolution, OCT is superior to intravascular ultrasound in the detection of even minor degrees of strut malapposition, tissue prolapse, residual thrombus and edge dissections. Furthermore, during follow-up OCT has a unique value to unravel the presence of strut coverage and to detect mild amounts of neointimal proliferation that might represent a valid surrogate marker of drug-eluting stent safety and efficacy. Finally, OCT has been used to unravel the underlying mechanisms implicated in stent failure, namely in-stent restenosis and stent thrombosis. Therefore, OCT appears ideally suited to help to move forward our understanding on the pathophysiology of coronary artery disease and to improve clinical decision-making processes, meeting the ever-increasing demand on coronary artery anatomical information from clinicians and researchers.

Adaptable Bayesian classifier for spatiotemporal nonparametric moving object detection strategies

Electronic devices endowed with camera platforms require new and powerful machine vision applications, which commonly include moving object detection strategies. To obtain high-quality results, the most recent strategies estimate nonparametrically background and foreground models and combine them by means of a Bayesian classifier. However, typical classifiers are limited by the use of constant prior values and they do not allow the inclusion of additional spatiodependent prior information. In this Letter, we propose an alternative Bayesian classifier that, unlike those reported before, allows the use of additional prior information obtained from any source and depending on the spatial position of each pixel.

Common and less-common renal masses and masslike conditions

As an increasing number of imaging examinations are performed, a greater number of incidental renal lesions are detected. Apart from the usual cysts and solid renal cell carcinomas, a variety of unusual benign and malignant renal lesions exist. Imaging is invaluable in characterizing these lesions and is confirmatory in some benign lesions. Renal cell carcinoma remains the diagnosis of exclusion; however, assessment of the imaging pattern in the appropriate clinical context can improve diagnostic accuracy. The objective of this article is to familiarize the radiologist with the imaging appearance of unusual non-neoplastic and neoplastic lesions and correlate with histopathologic studies when available.

Imaging of uncommon retroperitoneal masses

Retroperitoneal masses not arising from major solid organs are uncommon. Although there is no simple method of classifying retroperitoneal masses, a reasonable approach is to consider the masses as predominantly solid or cystic and to subdivide these into neoplastic and nonneoplastic masses. Because the treatment options vary, it is useful to be able to differentiate these masses by using imaging criteria. Although the differential diagnosis of retroperitoneal masses can be narrowed down to a certain extent on the basis of imaging characteristics, patterns of involvement, and demographics, there is still a considerable overlap of imaging findings for these masses, and histologic examination is often required for definitive diagnosis. Computed tomography (CT) and magnetic resonance (MR) imaging play an important role in characterization and in the assessment of the extent of the disease and involvement of adjacent and distant structures. Familiarity with the CT and MR imaging features of various retroperitoneal masses will facilitate accurate diagnosis and staging for aggressive lesions.

Enzymatic targeting of the stroma ablates physical barriers to treatment of pancreatic ductal adenocarcinoma

Pancreatic ductal adenocarcinomas (PDAs) are characterized by a robust fibroinflammatory response. We show here that this desmoplastic reaction generates inordinately high interstitial fluid pressures (IFPs), exceeding those previously measured or theorized for solid tumors, and induces vascular collapse, while presenting substantial barriers to perfusion, diffusion, and convection of small molecule therapeutics. We identify hyaluronan, or hyaluronic acid (HA), as the primary matrix determinant of these barriers and show that systemic administration of an enzymatic agent can ablate stromal HA from autochthonous murine PDA, normalize IFP, and re-expand the microvasculature. In combination with the standard chemotherapeutic, gemcitabine, the treatment permanently remodels the tumor microenvironment and consistently achieves objective tumor responses, resulting in a near doubling of overall survival.

PM01183, a new DNA minor groove covalent binder with potent in vitro and in vivo anti-tumour activity

BACKGROUND AND PURPOSE

PM01183 is a new synthetic tetrahydroisoquinoline alkaloid that is currently in phase I clinical development for the treatment of solid tumours. In this study we have characterized the interactions of PM01183 with selected DNA molecules of defined sequence and its in vitro and in vivo cytotoxicity.

EXPERIMENTAL APPROACH

DNA binding characteristics of PM01183 were studied using electrophoretic mobility shift assays, fluorescence-based melting kinetic experiments and computational modelling methods. Its mechanism of action was investigated using flow cytometry, Western blot analysis and fluorescent microscopy. In vitro anti-tumour activity was determined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay and the in vivo activity utilized several human cancer models.

KEY RESULTS

Electrophoretic mobility shift assays demonstrated that PM01183 bound to DNA. Fluorescence-based thermal denaturation experiments showed that the most favourable DNA triplets providing a central guanine for covalent adduct formation are AGC, CGG, AGG and TGG. These binding preferences could be rationalized using molecular modelling. PM01183-DNA adducts in living cells give rise to double-strand breaks, triggering S-phase accumulation and apoptosis. The potent cytotoxic activity of PM01183 was ascertained in a 23-cell line panel with a mean GI(50) value of 2.7 nM. In four murine xenograft models of human cancer, PM01183 inhibited tumour growth significantly with no weight loss of treated animals.

CONCLUSIONS AND IMPLICATIONS

PM01183 is shown to bind to selected DNA sequences and promoted apoptosis by inducing double-strand breaks at nanomolar concentrations. The potent anti-tumour activity of PM01183 in several murine models of human cancer supports its development as a novel anti-neoplastic agent.