Colon adenocarcinoma diagnosis in human samples by multicontrast nonlinear optical microscopy of hematoxylin and eosin stained histological sections

Combined multimodal nonlinear optical (NLO) microscopies were used to detect and quantify morphological changes associated with stroma and epithelial transformation in colon cancer. Our findings provide complementary information about tissue microstructure, displaying distinctive patterns between normal and malignant human colon. Additionally, we have demonstrated the usefulness of using fixed tissues for the disease diagnostic and prognostic. The present work provides a framework for using NLO techniques as a clinical diagnostic tool for human colon cancer. NLO metrics could be applied to other disorders, which are characterized by abnormal cell proliferation and collagen assembly.Fil: Adur, Javier Fernando. Universidad Nacional de Entre Ríos. Facultad de Ingeniería; Argentina. National Institute of Science and Technology on Photonics Applied to Cell Biology; Brasil. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones y Transferencia de Entre Ríos. Universidad Nacional de Entre Ríos. Centro de Investigaciones y Transferencia de Entre Ríos; ArgentinaFil: Bianchi, Mariana. Universidad Nacional de Entre Ríos. Facultad de Ingeniería; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Pelegati, Vitor B.. National Institute of Science and Technology on Photonics Applied to Cell Biology; BrasilFil: Viale, Silvia. Universidad Nacional de Entre Ríos. Facultad de Ingeniería; ArgentinaFil: Izaguirre, María Fernanda. Universidad Nacional de Entre Ríos. Facultad de Ingeniería; ArgentinaFil: Carvalho, Hernandes Faustino. Universidade Estadual de Campinas; BrasilFil: Cesar, Carlos L.. Universidade Estadual de Campinas; BrasilFil: Casco, Victor Hugo. Universidad Nacional de Entre Ríos. Facultad de Ingeniería; Argentin

The Effects Of 5-Ht4 Receptor Agonists On Interleukin-10 Knockout Mice

Recent studies have demonstrated that activation of the 5-HT4 receptors in the colonic mucosa can have healing and protective actions in experimental models of colitis. These actions include increased mucus secretion, increased epithelial proliferation, and enhanced epithelial migration. Since these studies involved chemically induced models of colitis, the current investigation was conducted to test whether a protective action of 5-HT4 receptor stimulation could be detected in Interleukin-10 knockout (IL-10 KO), which develop colitis spontaneously due to the absence of the anti-inflammatory cytokine, interleukin-10. Upon weaning, the IL-10 knockout mice were separated into two groups: an agonist group and a vehicle control group. The agonist group received 1 mg/kg tegaserod in a vehicle consisting of 0.9% saline each day by enema of dimethyl sulfoxide (DMSO) in saline each day, while the control group received daily enemas of vehicle over the course of 21 days. Several outcome measures were used to assess the effectiveness of the treatment. To evaluate the severity of colitis, disease activity index was monitored, and histologic damage was blindly scored. Administration of tegaserod by enema to the IL-10 KO mice had a significant protective effect on the treated mice. The disease activity index (DAI) of agonist treated mice was significantly better than that of vehicle treated mice over time (p\u3c0.001; 2-way ANOVA). Mice treated with vehicle had a more significant decline in health over time versus the agonists, with more blood present in feces and a looser/diarrhea-like consistency in stool. The histological damage score (HDS) was also improved by 5-HT4 agonist treatment (p\u3c0.05, t-test). Sections of vehicle treated colons showed significantly greater damage, including epithelial erosions, the presence of polymorphonuclear cells, and abnormal crypt architecture (cryptitis), than those treated with the 5-HT4 receptor agonist tegaserod. During the 21-day course of the current investigation, there was no difference in the survival data between the two groups. These data, when taken together, suggest that administration of the 5-HT4 receptor agonist tegaserod via enema to IL-10 KO mice has a greater healing and protective effect than seen in the IL-10 KO mice that received vehicle. We proposed to test the hypothesis that treatment of IL-10 knockout colitis with a 5-HT4 receptor agonist will attenuate the development of colitis and have healing and protective effects in the colons of the treated mice

Miami Classification for Probe-Based Confocal Laser Endomicroscopy

An essential element for any new advanced imaging technology is standardization of indications, terminology, categorization of images, and research priorities. In this review, we propose a state-of-the-art classification system for normal and pathological states in gastrointestinal disease using probe-based confocal laser endomicroscopy (pCLE). The Miami classification system is based on a consensus of pCLE users reached during a meeting held in Miami, Florida, in February 2009

Hypothesis: Caco‐2 cell rotational 3D mechanogenomic turing patterns have clinical implications to colon crypts

Colon crypts are recognized as a mechanical and biochemical Turing patterning model. Colon epithelial Caco‐2 cell monolayer demonstrated 2D Turing patterns via force analysis of apical tight junction live cell imaging which illuminated actomyosin meshwork linking the actomyosin network of individual cells. Actomyosin forces act in a mechanobiological manner that alters cell/nucleus/tissue morphology. We observed the rotational motion of the nucleus in Caco‐2 cells that appears to be driven by actomyosin during the formation of a differentiated confluent epithelium. Single‐ to multi‐cell ring/torus‐shaped genomes were observed prior to complex fractal Turing patterns extending from a rotating torus centre in a spiral pattern consistent with a gene morphogen motif. These features may contribute to the well‐described differentiation from stem cells at the crypt base to the luminal colon epithelium along the crypt axis. This observation may be useful to study the role of mechanogenomic processes and the underlying molecular mechanisms as determinants of cellular and tissue architecture in space and time, which is the focal point of the 4D nucleome initiative. Mathematical and bioengineer modelling of gene circuits and cell shapes may provide a powerful algorithm that will contribute to future precision medicine relevant to a number of common medical disorders.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/146665/1/jcmm13853.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/146665/2/jcmm13853_am.pd

Teaching gastrointestinal history: t he efficacy of including a comprehensive endoscopic digital overview of the gastrointestinal system in a histology curriculum

Thesis (M.A.)--Boston UniversityOver the past several decades, significant changes have been made to the methods of teaching medical histology. One of the most significant modifications is the implementation of virtual microscopy in replacement of conventional light microscopes and glass slides. This innovative method for viewing histological samples allows students to use their computers as virtual microscopes and gives them access to hundreds of relevant digital histology slides through an online database. This modification increases efficiency and gives students more time to explore clinically relevant topics. One challenge students face in a typical histology curriculum is developing a connection between the microscopic histological samples in which they are studying and their macroscale anatomical counterparts. In gastrointestinal histology in particular, the ability to bridge this gap is imperative for generating an all-encompassing understanding of this complex system. On endoscopy, the specialized mucosal surfaces of the organs of the gastrointestinal system can be thoroughly investigated. By combining high-definition endoscopic footage of the normal gastrointestinal system with histological samples, the bridge between microanatomy and macroanatomy can be established. This study investigates the implementation of a comprehensive overview of the structure and function of the gastrointestinal system using high-definition endoscopic videos and histologic samples in a graduate and medical histology curriculum. Student performance is analyzed by comparing test question performance between students who watched the video and students who did not. After a complete review of the student performance data and student feedback, it is evident that this multidimensional overview assisted students in developing a comprehensive understanding of gastrointestinal histology

Novel colorectal endoscopic in vivo imaging and resection practice: a short practice guide for interventional endoscopists

Colorectal cancer remains a leading cause of cancer death in the UK. With the advent of screening programmes and developing techniques designed to treat and stage colorectal neoplasia, there is increasing pressure on the colonoscopist to keep up to date with the latest practices in this area. This review looks at the basic principles behind endoscopic mucosal resection and forward to the potential endoscopic tools, including high-magnification chromoscopic colonoscopy, high-frequency miniprobe ultrasound and confocal laser scanning endomicroscopic colonoscopy, that may soon become part of routine colorectal cancer management

Clinical and pathologic remission of pediatric ulcerative colitis with serum-derived bovine immunoglobulin added to the standard treatment regimen

Ulcerative colitis (UC) is a chronic inflammatory bowel disease that is particularly troublesome for pediatric patients, as current therapeutic options consist of biologic agents and steroids which alter the immune response and have the harmful side effect of leaving the patient more susceptible to opportunistic infections and eventual surgery. Another option for therapy exists in the form of serum-derived bovine immunoglobulin/protein isolate (SBI), the key ingredient in a medical food, EnteraGam®. The FDA has reviewed the safety of SBI and issued a no challenge letter to the generally recognized as safe (GRAS) findings for this medical food. The product also has no known food or drug interactions, no significant adverse effects, and no contraindications, save for beef allergy. SBI has been shown to induce clinical remission in adult populations and to decrease markers of inflammation in pediatric patients. Here, we present a detailed case of pediatric UC, including documentation of mucosal healing and decrease in pediatric UC activity index in a difficult to treat pediatric patient, after the addition of SBI to this patient’s treatment regimen

Histologic Features with Predictive Value for Outcome of Patients with Ulcerative Colitis

Ulcerative colitis is an inflammatory bowel disease with variable evolution, in which is difficult to establish patient’s outcome. Histology is an important part of diagnosis of ulcerative colitis and has an increasing role in patients’ management, since increasingly more histologic features with predictive value are being identified and validated. This chapter presents the most important histologic prognostic factors that should be included in histologic reports of patients with ulcerative colitis. Basal plasmacytosis and histologic healing are the most significant validated factors of prognosis in ulcerative colitis, while dysplasia is important since colorectal carcinoma is a severe complication of the disease

An Investigation of the Diagnostic Potential of Autofluorescence Lifetime Spectroscopy and Imaging for Label-Free Contrast of Disease

The work presented in this thesis aimed to study the application of fluorescence lifetime spectroscopy (FLS) and fluorescence lifetime imaging microscopy (FLIM) to investigate their potential for diagnostic contrast of diseased tissue with a particular emphasis on autofluorescence (AF) measurements of gastrointestinal (GI) disease. Initially, an ex vivo study utilising confocal FLIM was undertaken with 420 nm excitation to characterise the fluorescence lifetime (FL) images obtained from 71 GI samples from 35 patients. A significant decrease in FL was observed between normal colon and polyps (p = 0.024), and normal colon and inflammatory bowel disease (IBD) (p = 0.015). Confocal FLIM was also performed on 23 bladder samples. A longer, although not significant, FL for cancer was observed, in paired specimens (n = 5) instilled with a photosensitizer. The first in vivo study was a clinical investigation of skin cancer using a fibre-optic FL spectrofluorometer and involved the interrogation of 27 lesions from 25 patients. A significant decrease in the FL of basal cell carcinomas compared to healthy tissue was observed (p = 0.002) with 445 nm excitation. A novel clinically viable FLS fibre-optic probe was then applied ex vivo to measure 60 samples collected from 23 patients. In a paired analysis of neoplastic polyps and normal colon obtained from the same region of the colon in the same patient (n = 12), a significant decrease in FL was observed (p = 0.021) with 435 nm excitation. In contrast, with 375 nm excitation, the mean FL of IBD specimens (n = 4) was found to be longer than that of normal tissue, although not statistically significant. Finally, the FLS system was applied in vivo in 17 patients, with initial data indicating that 435 nm excitation results in AF lifetimes that are broadly consistent with ex vivo studies, although no diagnostically significant differences were observed in the signals obtained in vivo.Open Acces

From the surface to the single cell: Novel endoscopic approaches in inflammatory bowel disease

Inflammatory bowel diseases (IBD) comprise the two major entities Crohn's disease and ulcerative colitis and endoscopic imaging of the gastrointestinal tract has always been an integral and central part in the management of IBD patients. Within the recent years, mucosal healing emerged as a key treatment goal in IBD that substantially decides about the clinical outcome of IBD patients, thereby demanding for a precise, timely and detailed endoscopic assessment of the mucosal inflammation associated with IBD. Further, molecular imaging has tremendously expanded the clinical utility and applications of modern endoscopy, now encompassing not only diagnosis, surveillance, and treatment but also the prediction of individual therapy response. Within this review we describe novel endoscopic approaches and advanced endoscopic imaging methods for the diagnosis, treatment and surveillance of IBD patients. We begin by providing an overview over novel and advanced imaging techniques such as magnification endoscopy and dye-based and dye-less chromoendoscopy, endomicroscopy and endocytoscopy. We then describe how these techniques can be utilized for the precise and ultrastructural assessment of mucosal inflammation and dysplasia development associated with IBD and outline how they have enabled the endoscopist to gain insight onto the cellular level in real-time. Finally, we provide an outlook on how molecular imaging has rapidly evolved in the recent past and can be used to make individual predictions about the therapeutic response towards biological treatment