Search results for "Histology"

Assessment of the interaction of Portland cement-based materials with blood and tissue fluids using an animal model

2016

Portland cement used in the construction industry improves its properties when wet. Since most dental materials are used in a moist environment, Portland cement has been developed for use in dentistry. The first generation material is mineral trioxide aggregate (MTA), used in surgical procedures, thus in contact with blood. The aim of this study was to compare the setting of MTA in vitro and in vivo in contact with blood by subcutaneous implantation in rats. The tissue reaction to the material was also investigated. ProRoot MTA (Dentsply) was implanted in the subcutaneous tissues of Sprague-Dawley rats in opposite flanks and left in situ for 3 months. Furthermore the material was also store…

Itraconazole inhibits nuclear delivery of extracellular vesicle cargo by disrupting the entry of late endosomes into the nucleoplasmic reticulum

2021

ABSTRACT Extracellular vesicles (EVs) are mediators of intercellular communication under both healthy and pathological conditions, including the induction of pro‐metastatic traits, but it is not yet known how and where functional cargoes of EVs are delivered to their targets in host cell compartments. We have described that after endocytosis, EVs reach Rab7+ late endosomes and a fraction of these enter the nucleoplasmic reticulum and transport EV biomaterials to the host cell nucleoplasm. Their entry therein and docking to outer nuclear membrane occur through a tripartite complex formed by the proteins VAP‐A, ORP3 and Rab7 (VOR complex). Here, we report that the antifungal compound itracona…

Tissue microarrays: applications in study of p16 and p53 alterations in Ewing's cell lines

2008

Background Tissue microarrays (TMAs) are used to study genomics and proteomics in several tumour tissue samples. Cell lines (CC) are of great importance in the study of the genetic changes in tumours, and some reveal several aspects of tumour oncogenesis. There are few published reports on Ewing's tumours with TMAs including original tumours (OT) and corresponding CC. Methods We have performed four TMAs, from 3 OT and the corresponding CC of successive in vivo and in vitro tumour passages. Xenotransplant CC in nude mice from OT (XT/OT) was made. Subsequently multiple XT were performed and in vitro XT cell line (CC/XT) was obtained. In vivo re-inoculation of CC/XT (XT/CC) was planned. TMAs w…

Post-Mortem Investigations for the Diagnosis of Sepsis: A Review of Literature

2020

To date, sepsis is still one of the most important causes of death due to the difficulties concerning the achievement of a correct diagnosis. As well as in a clinical context, also in a medico-legal setting the diagnosis of sepsis can reveal challenging due to the unspecificity of the signs detected during autopsies, especially when no ante-mortem clinical data, laboratory, and cultural results are available. Thus, a systematic review of literature was performed to provide an overview of the main available and updated forensic tools for the post-mortem diagnosis of sepsis. Moreover, the aim of this review was to evaluate whether a marker or a combination of markers exist, specific enough to…

Automatic detection and analysis of cell motility in phase-contrast time-lapse images using a combination of maximally stable extremal regions and Ka…

2013

Phase-contrast illumination is simple and most commonly used microscopic method to observe nonstained living cells. Automatic cell segmentation and motion analysis provide tools to analyze single cell motility in large cell populations. However, the challenge is to find a sophisticated method that is sufficiently accurate to generate reliable results, robust to function under the wide range of illumination conditions encountered in phase-contrast microscopy, and also computationally light for efficient analysis of large number of cells and image frames. To develop better automatic tools for analysis of low magnification phase-contrast images in time-lapse cell migration movies, we investiga…

3.3 Glucose levels in microregions of multicellular EMT6/Ro tumor spheroids

1991

Muscle Biopsy; Processing and Evaluation

2014

Muscle biopsy is a diagnostic procedure to recognize myopathological lesions in skeletal muscle. It may be an open surgical procedure or performed by needle biopsy. The muscle biopsy ought to target a myopathologically affected muscle, chosen by clinical features and/or myoimaging. Preparative techniques entail histology, electron microscopy, enzyme histochemistry, and immunohistochemistry, but it is essential to leave additional tissue for possible subsequent biochemical and molecular investigations. The backbone of light microscopic, diagnostic studies is unfixed frozen muscle tissue with cross-sectioned muscle fibers. Correct archiving of biopsied muscle tissue for future diagnostic and …

A Rare Presentation of Mycosis Fungoides Mimicking Psoriasis Vulgaris

2009

Mycosis fungoides (MF) is an uncommon primary cutaneous lymphoma with a wide spectrum of clinicopathological manifestations. Diagnosis can be difficult in its early stages given the considerable overlap with more common benign dermatoses. We report an unusual case of MF in a 52-year-old male presenting with psoriasiform plaques on the palms and the soles who rapidly developed additional lesions on the scalp, limps and trunk. Punch biopsy of the face was obtained for routine histology and immunohistochemical stains. Chest X-ray, total body computed tomography scanning and excisional biopsy of the inguinal lymph node were performed. Review of the face biopsy revealed a diffuse dermal infiltra…

Myogenesis and contraction in the early embryonic heart of the rainbow trout

1977

Myogenesis in the embryonic heart of the rainbow trout, Salmo galrdneri (Rich.), was investigated electron microscopically from the 29th to the 41st somite stage. Thick and thin myofilaments are formed simultaneously as well as precursors of Z-lines, to which the thin filaments are attached. The genesis of filaments takes place in the region around the intracellular yolk droplets. The first myofibrils appear by the 33rd somite stage, probably formed by a mechanism of self-assembly in which the binding sites of actin and myosin participate. A- and I-bands do not develop before the 38th somite stage. The contraction already begins during the 33rd somite stage in the middle of the tubular hear…

DNA-fragmentation and expression of apoptosis-related proteins in muscular dystrophies

1997

Although numerous sarcolemmal protein defects in muscular dystrophies have been identified, the mechanisms linking these defects and muscle fibre degeneration are not fully characterized. As there is evidence that apoptosis is part of muscle fibre loss in dystrophin-deficient mdx-mice, apoptotic muscle fibre death may also play a role in humans with muscular dystrophies. We investigated in-situ DNA-fragmentation by the TUNEL-method and expression of apoptosis-related proteins immunohistochemically in 14 children suffering from deficiencies of dystrophin, adhalin, and merosin, and found TUNEL-positive chromatin-cleavage of muscle fibre nuclei in about 10% of non-necrotic muscle fibres. DNA-f…