이 작품은 공동 연구 및 교육 체험 프로그램 (작성) 및 디스커버리 그랜트 자연 과학에서 캐나다의 공학 연구위원회 (NSERC)에서 교부금에 의해 지원되었다.

저자가 공개하는 게 없다.

또한 간격 암 케이스의 사전 검사 X의 구조적 왜곡을 검출하기위한 기계 학습 및 CAD로 알려진 디지털 이미지 처리 및 패턴 인식의 정교한 기법의 일련 제시 하였다. 방법은 유방 촬영 영상에 존재하는 중심 조직 패턴의 분석을 기반으로합니다. 우리의 관련 연구에서 제안 된 몇 가지 더 많은 기능을 포함하여 우리의 방법은, 4 개 이하 FPS / 환자의 22에서 80 %의 감도로, 평균에, 15개월 앞서 ?...

유방암은 여성에 영향을 미치는 주요 질환과 여성, 2 중 암 관련 사망의 두 번째 주요 원인이다. 생존 가능성 및 유방암의 초기 단계에서의 효과적인 치료를 통해 영향을받는 환자의 예후를 개선하기 위해, 질병은 가능한 빨리 검출되어야한다. 유방암의 경우 후 ​​향적 분석에서 이상의 미묘한 징후가 이전에 취득한 심사 유방 X 선 3,4에서 관찰되었다. 건축 왜곡은 5,6를 감지하기 어려운 유방암의 가능성이 초기 단계의 하나의 지역화 된 유방 촬영 기호입니다. 관련 패턴은 막연하게 더 명확한 질량에 보이는 유방의 정상 구조의 왜곡으로 설명되어 있습니다. 건축 왜곡 유방 질량 또는 종양 형성의 초기 단계에서 나타날 수있다. 우리는 심사 유방 X 선 사진 전에 유방암 C의 검출에 얻은 가설울드 특히, 건축 왜곡 유방암의 초기 단계의 미​​묘한 징후가 포함되어 있습니다. 그림 1a 화면 감지 암의 경우의 이전 유방 촬영 이미지를 보여줍니다. 방사선 (JELD)에 의해 확인 된 이상의 영역은 빨간색 사각형으로 설명되어 있습니다. 종래 유방 X는 24개월도 1b에 도시 된 검출 유방 X 전에 촬영했다. 이전 유방 X 선 검사의 원본 인스턴스에서 암의 징후가 없음을 선언했다. 회고 분석 및 검출 유방 X 선 검출 암의 위치에 관한 의심 영역에 비해,이 방사선에 의해 표시하고, 이전 유방 X 선에 적색에서 설명된다. 의심스러운 지역의 spicules 등의 건축 왜곡의 흔적을 포함하고 있습니다. 컴퓨터 지원 진단 (CAD) 기술과 시스템은 브리의 검출 감도를 증가를 달성하기위한 가능성을 제공성 암 2,7-9. 그러나, 이러한 질량과 석회화와 같은 유방암의 다른 징후의 검출에 관한 문헌에 존재 출판물의 수와 비교하여, 연구의 단지 소수의 부재하에 구조적 왜곡 검출보고되었습니다 중앙 질량 10-17. 시판 CAD 시스템은 건축 왜곡 (18)의 검출에 제대로 수행 할 수 발견되었습니다. 3,4,19-22이 초기 단계에서 유방 질환의 발견과 치료를위한 전략을 개발하는 데 도움이, 그리고 개선으로 이어질 수있는 화면 감지 또는 간격 암의 경우 사전 검사 X - 레이에있는 건축 왜곡의 검출에 관한 연구 환자 23 예후. 실험에 대한 이미지의 준비 실험은 56 개인 106 이전 유방 X 선 검사를 포함하여 158 유방 촬영 영상 진단으로 실시되었다유방암과 13 정상인의 52 이미지. 연구 윤리 승인은 공동 건강 연구 윤리위원회, 의료 생명 윤리의 사무실, 캘거리 대학교 및 캘거리 지역 보건 당국에서 얻어졌다. 유방암 21,24,25의 조기 발견을위한 앨버타 프로그램 : 이미지가 스크린 테스트에서 얻을 수 있었다. 전에 검사 프로그램 외부 암의 진단에 검사 프로그램의 마지막 예약 방문에 인수 유방 X 선은 간격 암의 경우 사전 유방 X 선으로 표시 하였다. 해당 진단 검사 X - 레이를 사용할 수 없었다. 106 이전 유방 X 선 검사의 두 가지를 제외한 모든 검사 프로그램에서 자신의 수집 및 분석시 유방암의 흔적이 없어야 선언했다, 다른 두 유방 X 선 사진에 해당하는 개인은 조직 검사에 대해 언급했다. 암의 진단 및 이전 유방 X 사이의 시간 간격은 1.5였다 달15개월 7 개월의 표준 편차의 평균과 24.5 개월의. 데이터베이스에서 사용할 수있는 간격 암의 경우 이전 유방 X 선 사진의 모든이 더 의심스러운 부분이 식별 할 수있는 여섯 이미지를 제외하고, 본 연구에 포함되었다. 스크린 필름 유방 X 선 사진은 50 μm의 Lumiscan 85 레이저 스캐너 (Lumisys, 서니 베일, CA)을 사용하여 1 픽셀 당 12 비트 그레이 스케일 해상도의 공간 해상도로 디지털화 하였다. 유방 X 선 촬영 (JELD) 전문 전문 방사선 간격 암의 경우 106 이전 유방 X 선 사진을 모두 검토하고 이후의 영상 또는 조직 검사에서 사용할 수있는 보고서를 기반으로 사각형 상자와 건축 왜곡의 의심 영역을 표시하거나, 유방 X 선 검사의 세부 검사로 . 본 연구에 사용 된 데이터 집합의 106 이전에 유방 촬영 이미지, 38 이미지가 눈에 보이는 건축 왜곡이, 나머지 68 이미지가 더 명확하게 의심 또는 EV를 포함건축 왜곡을 답하라. 방사선에 의해 그려진 사각형 상자에 의해 확인 된 각 이전 유방 X 선 건축 왜곡의 단일 사이트가 포함되어 있습니다. 평균 폭, 높이, 및 방사선에 의해 표시된 이미지의 106 의심스러운 부분의 면적은 각각 표준 11.8 mm의 편차, 11.6 ㎜, 1073.9 mm 2로, 56mm, 39mm, 및 2,274밀리미터 2입니다.

detection of architectural distortion in prior mammograms via analysis of oriented patterns

우리는 유방 X 선에 유방 조직 패턴의 방향의 분석에 근거하여 구간 - 암 케이스의 사전 검사 X의 구조적 왜곡을 검출하기위한 방법을 보여준다. 우리는 구조적 왜곡 질량 또는 종양의 형성 전에 유방 촬영 영상에서 유방 조직 패턴의 정상적인 방향을 수정한다는 가설. 우리의 방법의 초기 단계에서, 관련 유방 X 선에 배향 구조는 조직 패턴을 방사하거나 교차 노드와 같은 사이트를 검출하는 가버 필터 및 위상 인물을 사용하여 분석된다. 각각의 검출 된 위치는 다음 노드 값, 프랙탈 차원, 특히 구조적 왜곡과 관련된 spiculating 패턴을 표현하기 위해 고안된 각도 소산의 측정치를 사용하는 것을 특징으로한다. 우리의 방법을 위해 개발 된 기능을 사용하여 56 시간 간격 암의 경우 106 이전 유방 X 선 및 13 정상의 경우 52 유방 X 선 사진의 데이터베이스로 테스트되었습니다건축 왜곡, 차 판별 분석을 통해 패턴 분류하고 떠나 한 환자 중 절차와 검증의 특성. 특성 분석을 운영 무료 응답 수신기의 결과에 따르면, 우리의 방법은 약에서 80 %의 민감도로, 유방암의 임상 진단 전에 (평균) 15 개월 촬영 전에 유방 X 선에 구조적 왜곡을 검출하는 능력을 입증 환자 당 5 잘못된 반응.

세 가지 기능, 각 기능이 자체적으로 사용되었다, 즉, 노드 값, FD, 및 H F, 0.61의 제공 AUC 값, 0.59, 0.64, 각각. 세 가지 기능을 결합하여 사용 AUC = 0.70으로 향상된 성능을 제공했습니다. 세 가지 기능의 조합을 얻을 FROC 곡선은 7.5 FPS / 환자에서 5.6 FPS / 환자와 89 %에서 80 %의 민감도를 나타내는 그림 11에 나와 있습니다. 오직 노드 값의 사용은 13.8 FPS / 환자에서 8.1 FPS / 환자와 ...

Watch this Scientific Journal Video about Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns at JoVE.com

Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns

우리는 이전 유방 X 선 검사에서 건축 왜곡의 검출 방법을 보여줍니다. 배향 구조는 조직 패턴을 방사의 사이트를 검출하는 가버 필터 및 위상 인물을 사용하여 분석된다. 각 사이트의 특징과 spiculating 패턴을 표현하는 수단을 사용하여 분류된다. 방법은 유방암의 검출을 지원한다.

이전 유방 X 선 사진에있는 건축 왜곡의 검출<em&gt;를 통해</em지향 패턴의&gt; 분석

We demonstrate methods for the detection of architectural distortion in prior mammograms of interval-cancer cases based on analysis of the orientation of ...

detection-architectural-distortion-prior-mammograms-via-analysis

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Medicine

Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns

42.5K 조회수.  University of Calgary.  우리는 이전 유방 X 선 검사에서 건축 왜곡의 검출 방법을 보여줍니다. 배향 구조는 조직 패턴을 방사의 사이트를 검출하는 가버 필터 및 위상 인물을 사용하여 분석된다. 각 사이트의 특징과 spiculating 패턴을 표현하는 수단을 사용하여 분류된다. 방법은 유방암의 검출을 지원한다. 

비디오: Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns

Production and Detection of Reactive Oxygen Species (ROS) in Cancers

Reactive oxygen species include a number of molecules that damage DNA and RNA and oxidize proteins and lipids (lipid peroxydation). These reactive molecules contain an oxygen and include H2O2 (hydrogen peroxide), NO (nitric oxide), O2- (oxide anion), peroxynitrite (ONOO-), hydrochlorous acid (HOCl), and hydroxyl radical (OH-).
Oxidative species are produced not only under pathological situations (cancers, ischemic/reperfusion, neurologic and cardiovascular pathologies, infectious diseases, inflammatory diseases 1, autoimmune diseases 2, etc&hellip;) but also during physiological (non-pathological) situations such as cellular metabolism 3, 4. Indeed, ROS play important roles in many cellular signaling pathways (proliferation, cell activation 5, 6, migration 7 etc..). ROS can be detrimental (it is then referred to as "oxidative and nitrosative stress") when produced in high amounts in the intracellular compartments and cells generally respond to ROS by upregulating antioxidants such as superoxide dismutase (SOD) and catalase (CAT), glutathione peroxidase (GPx) and glutathione (GSH) that protects them by converting dangerous free radicals to harmless molecules (i.e. water). Vitamins C and E have also been described as ROS scavengers (antioxidants).
Free radicals are beneficial in low amounts 3. Macrophage and neutrophils-mediated immune responses involve the production and release of NO, which inhibits viruses, pathogens and tumor proliferation 8. NO also reacts with other ROS and thus, also has a role as a detoxifier (ROS scavenger). Finally NO acts on vessels to regulate blood flow which is important for the adaptation of muscle to prolonged exercise 9, 10. Several publications have also demonstrated that ROS are involved in insulin sensitivity 11, 12.
Numerous methods to evaluate ROS production are available. In this article we propose several simple, fast, and affordable assays; these assays have been validated by many publications and are routinely used to detect ROS or its effects in mammalian cells. While some of these assays detect multiple ROS, others detect only a single ROS.

Production and Detection of Reactive Oxygen Species ROS in Cancers

Here we propose simple methods to test and evaluate the presence of reactive oxygen species in cells.

암의 생산 및 반응 산소 종의 감지 (ROS)

Reactive oxygen species include a number of molecules that damage DNA and RNA and oxidize proteins and lipids (lipid peroxydation). These reactive ...

연구

의학

Cerenkov Luminescence Imaging (CLI) for Cancer Therapy Monitoring

In molecular imaging, positron emission tomography (PET) and optical imaging (OI) are two of the most important and thus most widely used modalities1-3. PET is characterized by its excellent sensitivity and quantification ability while OI is notable for non-radiation, relative low cost, short scanning time, high throughput, and wide availability to basic researchers. However, both modalities have their shortcomings as well. PET suffers from poor spatial resolution and high cost, while OI is mostly limited to preclinical applications because of its limited tissue penetration along with prominent scattering optical signals through the thickness of living tissues.
 Recently a bridge between PET and OI has emerged with the discovery of Cerenkov Luminescence Imaging (CLI)4-6. CLI is a new imaging modality that harnesses Cerenkov Radiation (CR) to image radionuclides with OI instruments. Russian Nobel laureate Alekseyevich Cerenkov and his colleagues originally discovered CR in 1934. It is a form of electromagnetic radiation emitted when a charged particle travels at a superluminal speed in a dielectric medium7,8. The charged particle, whether positron or electron, perturbs the electromagnetic field of the medium by displacing the electrons in its atoms. After passing of the disruption photons are emitted as the displaced electrons return to the ground state. For instance, one 18F decay was estimated to produce an average of 3 photons in water5. 
 Since its emergence, CLI has been investigated for its use in a variety of preclinical applications including in vivo tumor imaging, reporter gene imaging, radiotracer development, multimodality imaging, among others4,5,9,10,11. The most important reason why CLI has enjoyed much success so far is that this new technology takes advantage of the low cost and wide availability of OI to image radionuclides, which used to be imaged only by more expensive and less available nuclear imaging modalities such as PET.
 Here, we present the method of using CLI to monitor cancer drug therapy. Our group has recently investigated this new application and validated its feasibility by a proof-of-concept study12. We demonstrated that CLI and PET exhibited excellent correlations across different tumor xenografts and imaging probes. This is consistent with the overarching principle of CR that CLI essentially visualizes the same radionuclides as PET. We selected Bevacizumab (Avastin; Genentech/Roche) as our therapeutic agent because it is a well-known angiogenesis inhibitor13,14. Maturation of this technology in the near future can be envisioned to have a significant impact on preclinical drug development, screening, as well as therapy monitoring of patients receiving treatments.

Cerenkov Luminescence Imaging CLI for Cancer Therapy Monitoring

Use of Cerenkov Luminescence Imaging (CLI) for monitoring preclinical cancer treatment is described here. This method takes advantage of Cerenkov Radiation (CR) and optical imaging (OI) to visualize radiolabeled probes and thus provides an alternative to PET in preclinical therapeutic monitoring and drug screening.

암 치료 모니터링을위한 Cerenkov 발광 이미징 (CLI)

In  molecular imaging, positron emission tomography (PET) and optical imaging (OI)  are two of the most important and thus most widely used modalities1-3. ...

Identification of Disease-related Spatial Covariance Patterns using Neuroimaging Data

The scaled subprofile model (SSM)1-4 is a multivariate PCA-based algorithm that identifies major sources of variation in patient and control group brain image data while rejecting lesser components (Figure 1). Applied directly to voxel-by-voxel covariance data of steady-state multimodality images, an entire group image set can be reduced to a few significant linearly independent covariance patterns and corresponding subject scores. Each pattern, termed a group invariant subprofile (GIS), is an orthogonal principal component that represents a spatially distributed network of functionally interrelated brain regions. Large global mean scalar effects that can obscure smaller network-specific contributions are removed by the inherent logarithmic conversion and mean centering of the data2,5,6. Subjects express each of these patterns to a variable degree represented by a simple scalar score that can correlate with independent clinical or psychometric descriptors7,8. Using logistic regression analysis of subject scores (i.e. pattern expression values), linear coefficients can be derived to combine multiple principal components into single disease-related spatial covariance patterns, i.e. composite networks with improved discrimination of patients from healthy control subjects5,6. Cross-validation within the derivation set can be performed using bootstrap resampling techniques9. Forward validation is easily confirmed by direct score evaluation of the derived patterns in prospective datasets10. Once validated, disease-related patterns can be used to score individual patients with respect to a fixed reference sample, often the set of healthy subjects that was used (with the disease group) in the original pattern derivation11. These standardized values can in turn be used to assist in differential diagnosis12,13 and to assess disease progression and treatment effects at the network level7,14-16. We present an example of the application of this methodology to FDG PET data of Parkinson's Disease patients and normal controls using our in-house software to derive a characteristic covariance pattern biomarker of disease.

Multivariate techniques including principal component analysis (PCA) have been used to identify signature patterns of regional change in functional brain images. We have developed an algorithm to identify reproducible network biomarkers for the diagnosis of neurodegenerative disorders, assessment of disease progression, and objective evaluation of treatment effects in patient populations.

신경 영상 데이터를 사용하여 질병과 관련된 공간 공분산 패턴의 식별

The scaled subprofile model (SSM)1-4 is a multivariate PCA-based algorithm that identifies major sources of variation in patient and control group brain ...

Carotid Artery Infusions for Pharmacokinetic and Pharmacodynamic Analysis of Taxanes in Mice

When proposing the use of a drug, drug combination, or drug delivery into a novel system, one must assess the pharmacokinetics of the drug in the study model. As the use of mouse models are often a vital step in preclinical drug discovery and drug development1-8, it is necessary to design a system to introduce drugs into mice in a uniform, reproducible manner. Ideally, the system should permit the collection of blood samples at regular intervals over a set time course. The ability to measure drug concentrations by mass-spectrometry, has allowed investigators to follow the changes in plasma drug levels over time in individual mice1, 9, 10. In this study, paclitaxel was introduced into transgenic mice as a continuous arterial infusion over three hours, while blood samples were simultaneously taken by retro-orbital bleeds at set time points. Carotid artery infusions are a potential alternative to jugular vein infusions, when factors such as mammary tumors or other obstructions make jugular infusions impractical. Using this technique, paclitaxel concentrations in plasma and tissue achieved similar levels as compared to jugular infusion. In this tutorial, we will demonstrate how to successfully catheterize the carotid artery by preparing an optimized catheter for the individual mouse model, then show how to insert and secure the catheter into the mouse carotid artery, thread the end of the catheter out through the back of the mouse&#8217;s neck, and hook the mouse to a pump to deliver a controlled rate of drug influx. Multiple low volume retro-orbital bleeds allow for analysis of plasma drug concentrations over time.

This method was developed with the goal of delivering a steady drug solution via the carotid artery, to assess the pharmacokinetics of novel drugs in mouse models.

When proposing the use of a drug, drug combination, or drug delivery into a novel system, one must assess the pharmacokinetics of the drug in the study ...

Tracking the Mammary Architectural Features and Detecting Breast Cancer with Magnetic Resonance Diffusion Tensor Imaging

Breast cancer is the most common cause of cancer among women worldwide. Early detection of breast cancer has a critical role in improving the quality of life and survival of breast cancer patients. In this paper a new approach for the detection of breast cancer is described, based on tracking the mammary architectural elements using diffusion tensor imaging (DTI). 
The paper focuses on the scanning protocols and image processing algorithms and software that were designed to fit the diffusion properties of the mammary fibroglandular tissue and its changes during malignant transformation. The final output yields pixel by pixel vector maps that track the architecture of the entire mammary ductal glandular trees and parametric maps of the diffusion tensor coefficients and anisotropy indices. 
The efficiency of the method to detect breast cancer was tested by scanning women volunteers including 68 patients with breast cancer confirmed by histopathology findings. Regions with cancer cells exhibited a marked reduction in the diffusion coefficients and in the maximal anisotropy index as compared to the normal breast tissue, providing an intrinsic contrast for delineating the boundaries of malignant growth. Overall, the sensitivity of the DTI parameters to detect breast cancer was found to be high, particularly in dense breasts, and comparable to the current standard breast MRI method that requires injection of a contrast agent. Thus, this method offers a completely non-invasive, safe and sensitive tool for breast cancer detection.

We describe how to obtain parametric and vector maps of the diffusion tensor of the breast using magnetic resonance imaging. The protocol and final output following imaging processing are tailored for tracking breast architectural features and detecting breast malignancy.

자기 공명 확산 텐서 영상과 유방 아키텍처 특징을 추적 및 탐지 유방암

Breast cancer is the most common cause of cancer among women worldwide. Early detection of breast cancer has a critical role in improving the quality of ...

Normothermic Ex Vivo Kidney Perfusion for the Preservation of Kidney Grafts prior to Transplantation

Kidney transplantation has become a well-established treatment option for patients with end-stage renal failure. The persisting organ shortage remains a serious problem. Therefore, the acceptance criteria for organ donors have been extended leading to the usage of marginal kidney grafts. These marginal organs tolerate cold storage poorly resulting in increased preservation injury and higher rates of delayed graft function. To overcome the limitations of cold storage, extensive research is focused on alternative normothermic preservation methods.
Ex vivo normothermic organ perfusion is an innovative preservation technique. The first experimental and clinical trials for ex vivo lung, liver, and kidney perfusions demonstrated favorable outcomes.
In addition to the reduction of cold ischemic injury, the method of normothermic kidney storage offers the opportunity for organ assessment and repair. This manuscript provides information about kidney retrieval, organ preservation techniques, and isolated ex vivo normothermic kidney perfusion (NEVKP) in a porcine model. Surgical techniques, set up for the perfusion solution and the circuit, potential assessment options, and representative results are demonstrated.

Normothermic Ex Vivo Kidney Perfusion for the Preservation of Kidney Grafts prior to Transplantation

The severe organ shortage has resulted in increased use of marginal kidney grafts for transplantation. This has triggered interest in alternative storage methods, since marginal grafts especially tolerate cold storage poorly. The technique of normothermic ex vivo kidney perfusion (NEVKP) represents a novel preservation method for kidney grafts prior to &#160;transplantation.

정상 체온<em&gt; 전의 VIVO</em&gt; 신장의 보존을위한 신장 관류는 이식 전에 이식

Kidney transplantation has become a well-established treatment option for patients with end-stage renal failure. The persisting organ shortage remains a ...

VDJ-Seq: Deep Sequencing Analysis of Rearranged Immunoglobulin Heavy Chain Gene to Reveal Clonal Evolution Patterns of B Cell Lymphoma

Understanding tumor clonality is critical to understanding the mechanisms involved in tumorigenesis and disease progression. In addition, understanding the clonal composition changes that occur within a tumor in response to certain micro-environment or treatments may lead to the design of more sophisticated and effective approaches to eradicate tumor cells. However, tracking tumor clonal sub-populations has been challenging due to the lack of distinguishable markers. To address this problem, a VDJ-seq protocol was created to trace the clonal evolution patterns of diffuse large B cell lymphoma (DLBCL) relapse by exploiting VDJ recombination and somatic hypermutation (SHM), two unique features of B cell lymphomas.
In this protocol, Next-Generation sequencing (NGS) libraries with indexing potential were constructed from amplified rearranged immunoglobulin heavy chain (IgH) VDJ region from pairs of primary diagnosis and relapse DLBCL samples. On average more than half million VDJ sequences per sample were obtained after sequencing, which contain both VDJ rearrangement and SHM information. In addition, customized bioinformatics pipelines were developed to fully utilize sequence information for the characterization of IgH-VDJ repertoire within these samples. Furthermore, the pipeline allows the reconstruction and comparison of the clonal architecture of individual tumors, which enables the examination of the clonal heterogeneity within the diagnosis tumors and deduction of clonal evolution patterns between diagnosis and relapse tumor pairs. When applying this analysis to several diagnosis-relapse pairs, we uncovered key evidence that multiple distinctive tumor evolutionary patterns could lead to DLBCL relapse. Additionally, this approach can be expanded into other clinical aspects, such as identification of minimal residual disease, monitoring relapse progress and treatment response, and investigation of immune repertoires in non-lymphoma contexts.

This protocol describes an approach to interrogate the recombined immunoglobulin heavy chain VDJ regions of lymphomas by deep-sequencing and retrieve VDJ rearrangement and somatic hypermutation status to delineate clonal architecture of individual tumor. Comparing clonal architecture between paired diagnosis and relapse samples reveals lymphoma relapse clonal evolution modes.

VDJ-SEQ : B 세포 림프종의 클론 진화 패턴을 나타 내기 위해 재 배열 면역 글로불린 무거운 체인 유전자의 깊은 시퀀싱 분석

Understanding tumor clonality is critical to understanding the mechanisms involved in tumorigenesis and disease progression. In addition, understanding ...

Depletion of Mouse Cells from Human Tumor Xenografts Significantly Improves Downstream Analysis of Target Cells

The use of in vitro cell line models for cancer research has been a useful tool. However, it has been shown that these models fail to reliably mimic patient tumors in different assays1. Human tumor xenografts represent the gold standard with respect to tumor biology, drug discovery, and metastasis research 2-4. Tumor xenografts can be derived from different types of material like tumor cell lines, tumor tissue from primary patient tumors4 or serially transplanted tumors. When propagated in vivo, xenografted tissue is infiltrated and vascularized by cells of mouse origin. Multiple factors such as the tumor entity, the origin of xenografted material, growth rate and region of transplantation influence the composition and the amount of mouse cells present in tumor xenografts. However, even when these factors are kept constant, the degree of mouse cell contamination is highly variable.
Contaminating mouse cells significantly impair downstream analyses of human tumor xenografts. As mouse fibroblasts show high plating efficacies and proliferation rates, they tend to overgrow cultures of human tumor cells, especially slowly proliferating subpopulations. Mouse cell derived DNA, mRNA, and protein components can bias downstream gene expression analysis, next-generation sequencing, as well as proteome analysis 5. To overcome these limitations, we have developed a fast and easy method to isolate untouched human tumor cells from xenografted tumor tissue. This procedure is based on the comprehensive depletion of cells of mouse origin by combining automated tissue dissociation with the benchtop tissue dissociator and magnetic cell sorting. Here, we demonstrate that human target cells can be can be obtained with purities higher than 96% within less than 20 min independent of the tumor type.

Human tumor xenografts are vascularized and infiltrated by cells of mouse origin during the growth phase in vivo. To circumvent the bias caused by these contaminating cells during downstream analysis, we developed a method allowing for comprehensive depletion of all mouse cells by magnetic cell sorting.

인간 종양 이종 이식에서 마우스 세포의 고갈은 크게 대상 세포의 다운 스트림 분석을 향상

The use of in vitro cell line models for cancer research has been a useful tool. However, it has been shown that these models fail to reliably mimic ...

Re-Arterialized Rat Partial Liver Transplantation with an in vivo Vessel-Oriented 70% Hepatectomy

Split liver transplantation and living liver donor liver transplantation were developed in the clinic to utilize liver organs in a more efficient manner. To better understand the mechanism behind these surgical procedures, a rat partial liver transplantation (PLTx) model was established for relevant surgical studies. Because of the complexity of the rat PLTx model, a protocol with detailed descriptions is required. An article published previously reported a protocol in which ex vivo hepatectomy was used to achieve 50% rat PLTx. In contrast to this protocol, we introduced a re-arterialized PLTx with an in vivo 70% hepatectomy. An updated vessel-oriented hepatectomy was incorporated into the rat PLTx to refine the microsurgical procedure. The portal veins and hepatic arteries of the left lateral lobe and the median lobe were individually dissected and ligated before removal of the liver parenchyma, thereby decreasing the probability of bleeding in the remnant liver stump. Furthermore, an end-to-side vessel anastomosis between the common hepatic artery and the enlarged proper hepatic artery was introduced to re-arterialize the hepatic artery. By using this end-to-side vessel anastomosis technique, the diameter of the anastomosis was enlarged, thereby decreasing the difficulty of hand suture and maintaining a high rate of anastomotic patency. Moreover, the cuff anastomosis of the infrahepatic vena cava was slightly modified. A section of circumferential liver parenchyma around the vena cava of a recipient was preserved during cuff anastomosis to maintain the three-dimensional shape of the vascular lumen. This section of liver parenchyma was removed after completing the anastomosis. With this modification, the step involving placement of stay sutures was omitted, thereby further shortening the cuff anastomosis time. By using this protocol of rat PLTx, a low liver enzyme level, an intact liver lobular architecture and a high survival rate were achieved after microsurgery.

Re-Arterialized Rat Partial Liver Transplantation with an in vivo Vessel-Oriented 70% Hepatectomy

Here, a protocol involving re-arterialized rat partial liver transplantation is presented. Specifically, 70% liver was resected in vivo by using an updated technique of vessel-oriented hepatectomy. The hepatic artery was reconstructed in an end-to-side manner. The cuff technique was modified to shorten the anastomosis time of the infrahepatic vena cava.

다시는 vivo에서 선박 지향 70% 쥐 부분 간 이식 Arterialized Hepatectomy

Split liver transplantation and living liver donor liver transplantation were developed in the clinic to utilize liver organs in a more efficient manner. ...

Development of a Novel Task-oriented Rehabilitation Program using a Bimanual Exoskeleton Robotic Hand

A robot-assisted hand is used for the rehabilitation of patients with impaired upper limb function, particularly for stroke patients with a loss of motor control. However, it is unclear how conventional occupational training strategies can be applied to the use of rehabilitation robots. Novel robotic technologies and occupational therapy concepts are used to develop a protocol that allows patients with impaired upper limb function to grasp objects using their affected hand through a variety of pinching and grasping functions. To conduct this appropriately, we used five types of objects: a peg, a rectangular cube, a cube, a ball, and a cylindrical bar. We also equipped the patients with a robotic hand, the Mirror Hand, an exoskeleton&#160;hand that is fitted to the subject&#8217;s affected hand and follows the movement of the sensor glove fitted to their unaffected hand (bimanual movement training (BMT)). This study had two stages. Three healthy subjects were first recruited to test the feasibility and acceptability of the training program. Three patients with hand dysfunction caused by stroke were then recruited to confirm the feasibility and acceptability of the training program, which was conducted on 3 consecutive days. On each day, the patient was monitored during 5 min of movement in a passive range of motion, 5 min of robot-assisted bimanual movement, and task-oriented training using the five objects. The results showed that both healthy subjects and subjects who had suffered a stroke in conjunction with the robotic hand could successfully grasp the objects. Both healthy subjects and those who had suffered a stroke performed well with the robot-assisted task-oriented training program in terms of feasibility and acceptability.

This study reports the development of a novel robot-assisted task-oriented program for hand rehabilitation. The developmental process consists of experiments using both healthy subjects and subjects who have had a stroke and suffered from subsequent motor control dysfunction.

바이매뉴얼 외골격 로봇 핸드를 이용한 새로운 과제 지향 재활 프로그램 개발

A robot-assisted hand is used for the rehabilitation of patients with impaired upper limb function, particularly for stroke patients with a loss of motor ...