Fig.3 AgNOR staining with peripheral blood lymphocytes. . The technical aspect of AgNOR staining procedure should be carefully dealt with. Attention should. Conclusions: AgNOR staining can be considered as a useful adjunct to adjunct procedures which can diagnose malignancy at the earliest. Silver staining results are comparable to those obtained. [A standardized AgNOR stain method for formalin fixed and paraffin embedded .. to be a good adjunct to presently available frozen section techniques and cytology.
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Argyrophilic nucleolar organizer region counts in multiple myeloma: Nuclei should be visible without phase contrast.
Cell proliferation indices, morphometry and DNA flow cytometry provide objective criteria for distinguishing low and high grade bladder carcinomas.
Spontaneous in vitro neoplastic evolution of cultures Chinese hamster cells. Jpn J Stainiing Genet 25, In our study, the results of size and dispersion of AgNORs were clearer without the use of counterstain. Abstract This study was conducted in the department of Pathology King Edward Medical University, from June to December to introduce the new method of AgNOR staining and its interpretation to increase its reliability.
Journal compilation Blackwell Publishing Ltd.
AgNOR staining and quantification.
The grading of size variation was performed according to Khan et al. Although amount of silver nitrate is in some relation to the amount of activity, or number of active, rDNA copies; it cannot be used for an accurate quantitative study, partly because of differences of silver staining strengths within and between slides depending on fixation procedures, density of nuclei, preparation quality and age of slides.
This study was conducted in the department of Pathology King Edward Medical University, from June to December to introduce the new method of AgNOR staining and its interpretation to increase tsaining reliability. AgNOR staining in malignant and benign effusion pak.
Another method was adopted by Mourad et al. These parameters should be correlated with the already established but expensive techniques of AgNOR area and size imaging by electron microscopy and flow cytometry, as an economical alternative Khan et al. The tissue was then ready for counts. Re-apply xylene if it dries out. This method gives excellent staininh, but you have to cope with a little bit of xylene smell.
Patients and methods We selected 60 samples, 10 samples each of normal brain tissue, reactive gliosis, pilocytic astrocytoma, astrocytoma grade II, astrocytoma grade III, and glioblastoma multiform grade IV astrocytoma. Modified method of AgNOR staining and interpretation was an easy, reliable and reproducible alternative to traditional AgNOR techniques for evaluating proliferation activity of cells in malignant and benign brain lesions.
Modified method of AgNOR staining for tissue and interpretation in histopathology
Rehydration was then performed in several changes of ultrapure distilled water. Moreover, in cancer tissues AgNOR protein expression was found to be strictly related to the cell duplication rate. Banacroft J D, Gamble M, editors.
Cancer Genet Cytogenet 35, We are aware that morphometric quantitative analysis for AgNOR dots should be performed; however, the technique is rather expensive and, unfortunately, is not available in our laboratory.
Open in a separate window. In situ Hybridization Methods protocols.
Interphase nucleolar organizer regions in cancer cells. Bovid cow diversity and evolution. These findings are not consistent with those reported by Mourad et al.
Alternatively, you can examine the slides directly with immersion oil. Incubate slides in borate buffer for min to wash slides from remaining acetic acid, and to adjust for a high pH which is favourable for silver staining.
Pgocedure of AgNOR in normal brain tissue and astrocytic glioma. We also pay words of praise for all who helped us in performing laboratory works, writing paper, checking statistics and references. Received Aug 12; Accepted Nov AgNOR size and dispersion may be more important than counting alone: At metaphase, silver nitrate stains nucleolus organizer regions which have been active in the preceding interphase.
After silver-staining, the NORs can be easily identified as black dots exclusively localised throughout the nucleolar area, and are called “AgNORs”.
AgNOR staining and quantification.
The skin sheds and the black spots disappear after a few days. We recommend the use of morphometry for AgNOR size in future. The nuclei stain light yellow and out line of nuclei as well as cells were usually clearly visible.
Two counts were performed.
A number of studies carried out in different tumour types demonstrated that malignant cells frequently present a greater AgNOR protein amount than corresponding non-malignant cells. Author information Article notes Copyright and License information Disclaimer. Over the past 12 years, the “AgNOR method” has been applied in tumour pathology for both diagnostic and prognostic purposes. Should not be used because of the blurring of AgNOR staining.
Our results show that the mAgNOR was 2.
Silver Staining for Nucleolar Organizer Regions
Two grams of silver nitrate and hence 6 ml of final working solution were found sufficient to stain five sections. The AgNORs appeared as black discrete dots in a pale yellow stained nucleus of astrocytes. However, AgNORs seem to reflect proliferation independent of cellular and nucleolar activity of tumour cells, as well Bankfalvi agnog al. The staining results of our study were brighter with toning agents as consistent with Mourad et al.
The tissue was deparaffinized in several changes of xylene and descending alcohol concentrations. Four-micron unstained sections were obtained from the selected areas of tissue to perform the silver staining.
Do not bring in contact with metal objects. The condenser was adjusted to change light intensity and allow prodedure visualization of the AgNORs.