Immunohistochemistry (IHC) is a technique for identifying cellular
or tissue constituents (antigens)
by means of antigen-antibody interactions, the site of antibody binding being
either by direct labelling of the antibody, or by use of a secondary labelling
In Situ Hybridization (ISH) techniques allow the demonstration of specific nucleic
acid sequences (genes) in their cellular environment.
Above: Human Papillomavirus DNA demonstrated by In Situ
in epithelial cells identified by indirect immunofluorescence using antibody
against cytokeratin (green)
OptiView DAB IHC Detection Kit
Ventana's OptiView DAB IHC Detection Kit (OptiView) is an indirect, biotin-free system for detecting mouse IgG, mouse IgM and rabbit primary antibodies. OptiView uses a proprietary, non-endogenous hapten system to provide enhanced sensitivity and specificity. OptiView's exclusive software gives users more control over their IHC protocol than ever before on the BenchMark family of instrumentation. This control allows OptiView to be optimized for any need ranging from very low-expressing antigens to shorter turnaround times.
Posted by admin on Thursday, June 30 @ 12:43:00 CEST (3265 reads) (Read More... | Score: 0)
News in In Situ Hybridization
RNAscope®: in situ RNA
RNAscope® is a new way of visualizing RNA markers in situ, revealing molecular profile you could never see before. Now, see and measure gene expression in every cell, all within the intricate cellular and tissue architecture of routine clinical specimens.
RNAscope® detects RNA in situ, down to single copy, a breakthrough opening up a world of new possibilities.
Although ISH/FISH-based in situ RNA detection techniques have been around for years, they are largely ineffective. They lack robustness and sensitivity to reliably detect the expression of most human genes. Microarray and PCR provide useful molecular profiles of diseases, but clinically relevant information regarding cellular and tissue context, as well as spatial variation of the expression patterns, is lost in the process.
RNAscope® provides the first opportunity to profile single cell gene expression in situ, unlocking the full potential of RNA biomarkers. The targeted molecular signature of every cell in a sample is revealed and measured precisely, all within the intricate cellular and tissue architecture of clinical specimens.
RNAscope® is the only technology that has the sensitivity to detect every gene in the human transcriptome in situ, and to simultaneously quantify multiple mRNA transcripts at a single cell level. This represents a game-changing breakthrough previously unattainable by any other approach.
To provide greater awareness of how easy it is for scientists to label primary antibodies within their own laboratories; Innova Biosciences (Cambridge UK) has launched a new marketing campaign - Go Direct! Rather than struggling with secondary reagents, scientists with the help of Lightning-Link™ are now able to label an antibody directly with minimal hands on time, less than 30 seconds.
Direct labeling of antibodies greatly simplifies immunodetection techniques. Without the problems of crossover and/or non-specific binding from secondary reagents it is far easier to obtain high quality results in techniques such as flow cytometry, ELISA, Western blotting and immunohistochemistry. The Lightning-Link™ range, the World’s easiest to use DIY antibody labeling kits, consists of over 40 different labels including enzymes, fluorescent proteins/dyes, tandems, biotin and streptavidin -
The Go Direct! campaign will run throughout 2010 with the objective being to increase awareness of how easy it is to directly label antibodies and in doing so, accelerate pioneering science whilst simultaneously saving both money and time!
Seeing is believing! For a timed demonstration video of the Lightning-Link™ antibody labeling process, please visit - Video
Posted by admin on Monday, January 18 @ 18:43:48 CET (4674 reads) (Read More... | 2168 bytes more | Score: 0)
PLA™ Proximity Ligation Assay technology
News in Immunohistochemistry
A Revolution in the Detection of Proteins
Duolink™ enables researchers to study signalling pathways in native cells and tissue in revolutionizing ways. Based on Olink Bioscience’s proprietary in situ Proximity Ligation Assay (in situ PLA), Duolink™ makes it possible to visualize, localize, and quantify individual protein interactions and modifications using standard fluorescence microscopy. This is the first technology that can readily detect and localize protein interactions without the need of tedious genetic engineering to tag and over-express proteins. Thereby, endogenous protein interactions in cells and tissue can be visualized using your regular immuno-staining antibodies combined with the generic Duolink™ kit.
Each spot makes the difference
The unique abiltity of in situ PLA™ to detect protein modifications, interactions, and their location in tissue samples offers exciting new opportunities in biomarker research. By providing the element of dual recognition to in situ analyses, pathology can expand into a new arena of analytes, beyond measuring the abundance of just a single protein.
PLA™, a proximity ligation assay technology, is capable of detecting single protein events such as protein interactions (e.g. protein dimerization) and modifications (e.g. protein phosphorylation).
The Duolink® reagent series, based on PLA, offers an unprecedented level of sensitivity and specificity for protein detection in fixed cells and tissues. The principle of the technology is based on two unique bi-functional probes called PLA probes. Each PLA probe consists of an antibody attached to a unique synthetic oligonucleotide, which acts as a reporter.
The assay provides exact spatial information on the location of the events and an objective means of quantifying the events.
In principle, with appropriate antibodies, in situ PLA can detect any antigen with proximate epitopes at the single molecule level.
Posted by admin on Monday, December 21 @ 10:14:42 CET (24567 reads) (Read More... | 8063 bytes more | Score: 4.74)
Diagnostic Immunohistochemistry: Theranostic and Genomic Applications, Expert Consult: Online and Print
By David J. Dabbs MD
Diagnostic Immunohistochemistry presents the latest information and most reliable guidance on immunohistological diagnoses in surgical pathology. David J. Dabbs, MD and other leading experts bring you state-of-the-art coverage on genomic and theranostic applications, molecular anatomic pathology, immunocytology, Non-Hodgkin's lymphoma, and more. Additional features such as tables discussing antibody specifications, differential diagnosis boxes, ancillary anatomic molecular diagnostics, and full-color histological images ensure user-friendly coverage that makes key information easy to find and apply. The fully searchable text is also available online at expertconsult.com, along with a downloadable image bank and access to Path Consult. This concise and complete resource is today's indispensable guide to the effective use of immunohistochemical diagnosis.
Posted by admin on Thursday, October 22 @ 11:11:53 CEST (6092 reads) (Read More... | 4032 bytes more | Score: 5)
Human Antibody Initiative
The mission of the Human Antibody Initiative (HAI) aims to promote and facilitate the use of antibodies for proteomics research. The initiative consists of two separate activities; (1) the generation of a catalogue of validated antibodies from many different sources and (2) a protein atlas for the expression and localization of human proteins in normal and disease tissue. The two separate activities have as their primary deliverables to generate databases with free public accessibility. The Antibody Resource database (www.antibodypedia.org) is aimed to produce a comprehensive catalogue of validated antibodies towards human proteins. This initiative depends on input from a large number of academic groups and commercial companies. The Protein Atlas initiative (www.proteinatlas.org) is aimed to provide comprehensive and annotated database of high-resolution images showing tissue profiles in normal and cancer tissues. Both databases will be open to the public without restriction (no passwords).
The Antibodypedia portal is a database developed within the 6th framework EU program ProteomeBinders and the project is part of the HUPO antibody initiative (HAI). This pilot portal provides a web-based submission format to allow any antibody provider or user to submit data about antibodies with validation scores for various applications. It is only possible to submit antibodies available to the scientific community. The database relies on validation scores, submitted by the antibody provider or user, based on a standard set of validation criteria, but it is important to point out that the validation is subjective in nature. It is thus mandatory to submit the primary data for applications with supportive or uncertain validation score, usually in the form of an image with text annotation, to allow the community to review the data behind the validation score. Users are also allowed to send in comments to the portal about the use of a particular antibody and in this manner both positive and negative results from a particular antibody can be shared among the scientific community. No curation of the data is done in the first phase, but the plan is to incorporate an independent curation step to ensure that the formal submission rules have been followed.
Vector Laboratories Inc is offering a comprehensive, illustrated guide to multiple antigen labeling for immunohistochemistry and immunofluorescent staining in tissues or cells.
A valuable resource for those considering localizing two or more antigens in the same tissue section. Protocols for chromogenic as well as fluorescent detection are accompanied by schematic illustrations of the procedures. A chart of all pair-wise combinations of substrates is included along with photographic examples. Practical tips regarding order of substrates, blocking, and proper controls are also provided.
Download a copy here (Vector Laboratories, pdf 8.2MB)
Posted by admin on Friday, August 28 @ 09:44:40 CEST (5402 reads) (Read More... | Score: 4)