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Srii R, Peter CD, Haragannavar VC, Shashidara R, Sridhara SU, Srivatsava S. Bee Honey as a Safer Alternative for Routine Formalin Fixation. Kathmandu Univ Med J (KUMJ) 2017; 15:308-312. [PMID: 30580347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Background Formaldehyde (10% buffered formalin) is still in use as the gold standard fixative in the field of biology however, as reported by Occupational Safety and Health Administration (OSHA) the use of formalin causes health hazards due to its toxicity. Hence, we considered to substitute formalin with natural Bee-Honey to achieve a formalin free laboratory for preservation of the biological specimens. Objective To assess the efficacy of honey as a fixative agent for the preservation of the tissue specimens and to study their cellular and structural characteristics by using routine stains, special stains and Immunohistochemistry (IHC) and compare its effectiveness with the currently, universally accepted formalin fixation. Method Our study contained sample size of 10 tissue specimens. All samples were fixed in two different solutions one in honey and other in conventionally used formalin solution for 24 hrs in room temperature and then were routinely processed, sectioned and stained using routine, special stains and with immuno-histochemical markers. The slides were viewed by two independent examiners and the entire procedure was blind folded. Result We obtained good comparable results with bee honey for Hematoxylin and Eosin, special stains including immunohistochemistry when compared to formalin fixed tissues. Conclusion Based on the observations of this study, it can be suggested that natural bee honey could be a safer alternative to formalin as a fixative, considering the health hazards of formalin.
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Stradleigh TW, Ishida AT. Fixation strategies for retinal immunohistochemistry. Prog Retin Eye Res 2015; 48:181-202. [PMID: 25892361 PMCID: PMC4543575 DOI: 10.1016/j.preteyeres.2015.04.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Revised: 04/06/2015] [Accepted: 04/06/2015] [Indexed: 10/23/2022]
Abstract
Immunohistochemical and ex vivo anatomical studies have provided many glimpses of the variety, distribution, and signaling components of vertebrate retinal neurons. The beauty of numerous images published to date, and the qualitative and quantitative information they provide, indicate that these approaches are fundamentally useful. However, obtaining these images entailed tissue handling and exposure to chemical solutions that differ from normal extracellular fluid in composition, temperature, and osmolarity. Because the differences are large enough to alter intercellular and intracellular signaling in neurons, and because retinae are susceptible to crush, shear, and fray, it is natural to wonder if immunohistochemical and anatomical methods disturb or damage the cells they are designed to examine. Tissue fixation is typically incorporated to guard against this damage and is therefore critically important to the quality and significance of the harvested data. Here, we describe mechanisms of fixation; advantages and disadvantages of using formaldehyde and glutaraldehyde as fixatives during immunohistochemistry; and modifications of widely used protocols that have recently been found to improve cell shape preservation and immunostaining patterns, especially in proximal retinal neurons.
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Hsia CCW, Hyde DM, Ochs M, Weibel ER. An official research policy statement of the American Thoracic Society/European Respiratory Society: standards for quantitative assessment of lung structure. Am J Respir Crit Care Med 2010; 181:394-418. [PMID: 20130146 DOI: 10.1164/rccm.200809-1522st] [Citation(s) in RCA: 694] [Impact Index Per Article: 46.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Gökçen A. [Fixation, staining and preparation of permanent mounts of helminths]. TURKIYE PARAZITOLOJII DERGISI 2008; 32:177-181. [PMID: 18645956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The techniques for the collection, relaxation, preservation and staining of helminths are very important for parasitologists. Parasites should be collected alive and fixed directly in the living condition. These procedures insure proper preservation of internal and external details of parasites. There are various methods for relaxing and preserving the normal morphology of helminths. These methods are absolutely essential for permanent preservation of the specimens. Staining and mounting techniques vary depending upon size of specimens, species, and stage of development of the organisms. In this review, the preparation of permanent mounts, relaxation, fixation and staining methods of helminths has been discussed.
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Goldstein NS, Hewitt SM, Taylor CR, Yaziji H, Hicks DG. Recommendations for improved standardization of immunohistochemistry. Appl Immunohistochem Mol Morphol 2007; 15:124-33. [PMID: 17525622 DOI: 10.1097/pai.0b013e31804c7283] [Citation(s) in RCA: 161] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Immunohistochemistry (IHC) continues to suffer from variable consistency, poor reproducibility, quality assurance disparities, and the lack of standardization resulting in poor concordance, validation, and verification. This document lists the recommendations made by the Ad-Hoc Committee on Immunohistochemistry Standardization to address these deficiencies. Contributing factors were established to be underfixation and irregular fixation, use of nonformalin fixatives and ancillary fixation procedures divested from a deep and full understanding of the IHC assay parameters, minimal or absent IHC assay optimization and validation procedures, and lack of a standard system of interpretation and reporting. Definitions and detailed guidelines pertaining to these areas are provided.
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Willmore-Payne C, Metzger K, Layfield LJ. Effects of Fixative and Fixation Protocols on Assessment of Her-2/neu Oncogene Amplification Status by Fluorescence In Situ Hybridization. Appl Immunohistochem Mol Morphol 2007; 15:84-7. [PMID: 17536313 DOI: 10.1097/01.pai.0000209866.20581.8e] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Fluorescence in situ hybridization (FISH) is used to determine amplification status of the Her-2/neu gene in specimens of newly diagnosed breast carcinoma. The Vysis kit for FISH analysis stipulates that the tissue be formalin-fixed and paraffin-embedded. Concerns regarding carcinogenicity of formalin and environmental effects of formalin waste have led to the development of formalin replacement products. An increasing number of breast biopsy specimens are being fixed in these substitutes. We tested 6 non-formalin-based fixatives to determine their impact on FISH testing for Her-2/neu gene amplification status by comparison with formalin-fixed control specimens from the same neoplasm. Specimens fixed in Pen-Fix, Prefer, Histochoice, UniFix, and GTF were associated with absent or technically compromised staining in at least one of the 3 neoplasms tested for each fixative when compared to the formalin-fixed control. O-Fix did not seem to compromise staining quality in 3 paired specimens tested.
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Abstract
Histologic evaluations and immunohistochemical characterizations are important in studies of artificial organs such as skin equivalents. However, tissue compact organization is not easy to obtain when the artificial organ is constructed in vitro. Thus, appropriate fixation methods must be selected according to the compactness of the artificial organ and tissue engineering methodologies. The effects of several fixatives-Carnoy, Bouin's solution, formalin, paraformaldehyde, and paraformaldehyde-glutaraldehyde-were examined to select the best fixation method for preserving the structural and molecular markers of skin equivalents. Formalin-based fixatives ware found to be relatively free of the histologic problems (e.g., tissue shrinkage, poor structural preservation, weak stainability, and nonspecific immunolocalization) presented by the soft tissue fixatives (i.e., Carnoy or Bouin's solution). Unfortunately, the standard concentration of formalin induced detachment of epidermis from dermis, but this was prevented by reducing the concentration of the fixative. These findings suggest that fixation procedures should be selected for particular tissue and specific goals; in particular, they show that the paraformaldehyde-glutaraldehyde combination performed best in terms of preserving the histologic features of skin equivalents.
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Nadji M, Nassiri M, Vincek V, Kanhoush R, Morales AR. Immunohistochemistry of Tissue Prepared by a Molecular-Friendly Fixation and Processing System. Appl Immunohistochem Mol Morphol 2005; 13:277-82. [PMID: 16082256 DOI: 10.1097/01.pai.0000146544.51771.79] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A recently introduced histologic fixative (Universal Molecular Fixative [UMFIX]) has been shown to preserve macromolecules in tissue at ambient temperature. When UMFIX-exposed tissues are processed by a formalin-free, microwave-assisted rapid processing system, the resulting paraffin blocks retain good histomorphology and intact nucleic acids suitable for expression microarray analysis. Because UMFIX may be used as an alternative to formalin, the authors set out to study the effect of this new fixation and processing system on immunohistochemistry (IHC) by analyzing a range of human neoplastic and non-neoplastic specimens. Parallel slices from surgically removed specimens were fixed in formalin and UMFIX and processed in a rapid microwave-assisted tissue processor. IHC was performed following routine procedures. The staining for those antibodies that normally required antigen retrieval was carried out with and without that step. The intensity and pattern of reactions were compared in 144 tissue samples fixed by the two methods using 70 monoclonal and polyclonal antibodies. The intensity of IHC reactions for most cytoplasmic antigens was generally equal or stronger in UMFIX tissues. This was particularly true with intermediate filaments and HercepTest, where the antigen retrieval step became unnecessary. Conversely, there was a decrease in the intensity of reactions for HepPar1, bcl-2, and three nuclear antigens (Ki-67, TTF-1, and estrogen receptor). Increasing their exposure times optimized the sensitivity of the latter four antibodies. The study shows that IHC staining results of tissues fixed in UMFIX and processed by the microwave-assisted system are comparable to those obtained on formalin-fixed, similarly processed specimens. There is an enhancement of the sensitivity of few antibodies in UMFIX-exposed tissue, rendering antigen retrieval unnecessary. This increased sensitivity may be due to the effect of eliminating formalin from fixation and processing or the microwave energy.
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Chohan KR, Griffin JT, Carrell DT. Evaluation of chromatin integrity in human sperm using acridine orange staining with different fixatives and after cryopreservation. Andrologia 2004; 36:321-6. [PMID: 15458552 DOI: 10.1111/j.1439-0272.2004.00626.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Staining of cells with acridine orange (AO) has been widely accepted as a predictor of DNA damage in many cell types. Because of variability of protocols used in previous studies, the AO staining technique has not been widely accepted as a screening test to predict DNA damage in human sperm. In order to further validate the use of AO staining, sperm were evaluated using numerous variations in the staining protocol. This study also elucidated the effects of cryopreservation on sperm DNA. Sperm fixation in Carnoy's solution showed significantly (P < 0.05) more DNA damage (29.9 +/- 4.5%) than 2% glutaraldehyde (14.4 +/- 2.1%), 4% paraformaldehyde (5.5 +/- 1.7%), no fixation (15.8 +/- 4.3%) but did not differ from Diff Quik solution (19.2 +/- 5.8%). No difference was observed for sperm DNA damage assessment using a 0.2 m (15.5 +/- 3.2%) or 0.3 m (14.9 +/- 3.3%) concentration of Na(2)HPO(4).7H(2)O in the AO staining solution. Frozen-thawed semen samples showed increased damage to sperm DNA under both Carnoy's (fresh: 10.9 +/- 1.3%; frozen: 30.8 +/- 2.9%; P < 0.05) and Diff Quik fixation (fresh: 6.2 +/- 0.8; frozen: 17.1 +/- 2.5%P < 0.05). Present data also showed that spermatozoa from some individuals are more prone to DNA damage after freezing and thawing procedures than others. In conclusion, Carnoy's fixative provides a better predictive value for DNA damage to sperm using AO staining. Additionally, cryopreservation increased damage to the sperm DNA.
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Rey I, Dorda BA, Valdecasas AG. Traditional water mite fixatives and their compatibility with later DNA studies. EXPERIMENTAL & APPLIED ACAROLOGY 2004; 34:59-65. [PMID: 15597600 DOI: 10.1023/b:appa.0000044439.21180.ec] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
This work compares frozen water, 70% alcohol, Koenike's and Angelier's fluid as preservation media for water mites in terms of their eventual facilitation of DNA extraction and amplification. The time the mites spent in the fixatives ranged between 1 week and 25 years. Two molecular markers were amplified: 16S ribosomal DNA and CoI mitochondrial DNA. DNA was extractable and could be sequenced from specimens fixed in all the above media, although this generally became more difficult as time progressed. In the light of the known characteristics of these media, the results suggest Angelier's fluid to be the most practical, especially on long expeditions.
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MESH Headings
- Animals
- Base Sequence
- DNA, Mitochondrial/analysis
- DNA, Mitochondrial/chemistry
- DNA, Mitochondrial/genetics
- Electron Transport Complex IV/chemistry
- Electron Transport Complex IV/genetics
- Fixatives/standards
- Mites/chemistry
- Mites/genetics
- Molecular Sequence Data
- Preservation, Biological/methods
- Preservation, Biological/standards
- RNA, Ribosomal, 16S/analysis
- RNA, Ribosomal, 16S/chemistry
- RNA, Ribosomal, 16S/genetics
- Sequence Analysis, DNA
- Spain
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Demiryürek D, Bayramoğlu A, Ustaçelebi S. Infective agents in fixed human cadavers: a brief review and suggested guidelines. THE ANATOMICAL RECORD 2002; 269:194-7. [PMID: 12209557 DOI: 10.1002/ar.10143] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Cadavers remain a principal teaching tool for anatomists and medical educators teaching gross anatomy. Infectious pathogens in cadavers that present particular risks include Mycobacterium tuberculosis, hepatitis B and C, the AIDS virus HIV, and prions that cause transmissible spongiform encephalopathies such as Creutzfeldt-Jakob disease (CJD) and Gerstmann-Straussler-Scheinker syndrome (GSS). It is often claimed that fixatives are effective in inactivation of these agents. Unfortunately cadavers, even though they are fixed, may still pose infection hazards to those who handle them. Specific safety precautions are necessary to avoid accidental disease transmission from cadavers before and during dissection and to decontaminate the local environment afterward. In this brief review, we describe the infectious pathogens that can be detected in cadavers and suggest safety guidelines for the protection of all who handle cadavers against infectious hazards.
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Fuzaylov SY, Serebruany VL. Amount of paraformaldehyde for sample fixation markedly affects the quality of platelet assessment by flow cytometry: experience from two clinical trials. Thromb Res 2000; 99:643-4. [PMID: 11203377 DOI: 10.1016/s0049-3848(00)00285-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Pleshko NL, Boskey AL, Mendelsohn R. An FT-IR microscopic investigation of the effects of tissue preservation on bone. Calcif Tissue Int 1992; 51:72-7. [PMID: 1393781 DOI: 10.1007/bf00296221] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Fourier transform infrared microscopy is a powerful tool for the characterization of mineral and protein in histologic sections of bone. This study was concerned with determining whether techniques used to preserve these tissues and to prepare them for sectioning had an effect on spectral properties. The nu 1, nu 3 phosphate bands in the 900-1200 cm-1 spectral region were used to evaluate the structure of the apatitic mineral in fresh-frozen, ethanol-fixed, and formalin-fixed 35-day-old rat femurs; fresh-frozen and formalin-fixed 20-day-old fetal rat femurs; ground 35-day-old rat diaphyseal bone samples; and formalin-fixed, methacrylate-embedded ground diaphyseal bone. The crystallinity (crystal size and perfection) of the bone apatite was assessed by a curve-fitting analysis of the nu 1, nu 3 phosphate bands. Results indicate that ethanol or formalin fixation of the 35-day-old intact rat femur, and formalin fixation and embedding of the ground rat bone do not significantly alter the crystallinity of the apatite. However, formalin fixation of the fetal rat bone did alter the structure of the apatite mineral phase. In addition, evaluation of protein secondary structure in the 35-day-old rat femur from the Amide I and Amide II vibrations near 1650 and 1550 cm-1, respectively, revealed that protein conformation was altered by ethanol fixation.
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Battifora H. Assessment of antigen damage in immunohistochemistry. The vimentin internal control. Am J Clin Pathol 1991; 96:669-71. [PMID: 1719801 DOI: 10.1093/ajcp/96.5.669] [Citation(s) in RCA: 80] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Monitoring of the quality of antigen preservation and the uniformity of tissue fixation in paraffin-embedded, formaldehyde-fixed tissues is facilitated by the routine use of an antibody to an epitope of vimentin that is partially susceptible to formaldehyde fixation. Other diagnostically useful molecules often show fixation- or processing-induced alterations that parallel those of the vimentin epitope. Thus, the use of vimentin as an internal control, or reporter molecule, and its extrapolation to other antigens allow for better interpretation of results, improved selection of fields optimal for diagnostic immunohistochemistry, and more rational application of compensatory procedures, such as protease digestion.
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Elias JM, Gown AM, Nakamura RM, Wilbur DC, Herman GE, Jaffe ES, Battifora H, Brigati DJ. Quality control in immunohistochemistry. Report of a workshop sponsored by the Biological Stain Commission. Am J Clin Pathol 1989; 92:836-43. [PMID: 2480062 DOI: 10.1093/ajcp/92.6.836] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Although immunohistochemical methods are increasingly applied in diagnostic histopathology, there has been little standardization or quality control of immunoreagents; and published reports have not standardized Material and Methods for meaningful comparisons of results among clinicians. The Biological Stain Commission-sponsored workshop was convened to address the following issues: a manufacturers' testing program for probity of commercial antibodies, development of a manual for performance criteria and quality control assurance procedures, standardization of package inserts, standardization of information provided in the Materials and Methods sections of publications, establishment of a reagent and procedure clearing house, study of the effects of different fixation regimes on tissue antigens, and investigation of the environmental conditions needed for antigen-antibody interaction. The recommendations of the ad hoc committee and their implications for the future are discussed.
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Nordt FJ, Seaman GV. The importance of formaldehyde purity in studies on the electrokinetic charge of human red cells. Biorheology 1989; 26:389-400. [PMID: 2513892 DOI: 10.3233/bir-1989-26221] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Electrokinetic measurements and rheological studies conducted in parallel have previously shown red cell surface charge to play a role in governing aggregative behavior and bulk flow properties of red cell suspensions. For these and other types of model investigations, aldehyde stabilized cells have been widely used. In this communication, the influence of the purity of formaldehyde was investigated. It was found that (a) the direct dissolution of commercially available paraformaldehyde in water or suitably buffered saline results in impure solutions which, if utilized in the fixation of human erythrocytes, produces cells which have significantly different electrophoretic properties from native cells; (b) the basis for the differences is the presence of metallic impurities in some commercially available paraformaldehyde preparations; (c) the impurities and thus the anomalous electrokinetic properties of the fixed cells may be eliminated by generating formaldehyde gas from paraformaldehyde by heating the latter to 203-210 degrees C; (d) alternatively, the impurities may be eliminated by addition of disodium ethylenediamine tetraacetate dihydrate to fixative solutions prepared directly from paraformaldehyde.
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Affandi MZ. Use of hairspray as a smear fixative. Acta Cytol 1989; 33:419. [PMID: 2543176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Holm K, Grinsted P, Poulsen EF, Fenger C. Can hairspray be used as a smear fixative? A comparison between two types of coating fixatives. Acta Cytol 1988; 32:422-4. [PMID: 3376710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Pairs of smears from 25 consecutive women undergoing routine screening and 30 consecutive colposcopy patients suspected of having cervical intraepithelial neoplasia were randomized and fixed with either Merckofix or a hairspray to compare their use as coating fixatives. Vacuolated cells from the cervical transformation zone were present in 9 of 25 and 24 of 30 smears fixed with hairspray against 2 of 25 and 2 of 30 of smears fixed with Merckofix in the two series, respectively. These findings indicate that the fixative effect of commercial hairsprays always should be tested before such hairsprays are introduced into routine procedures.
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Moran MM, Siegel RJ, Said JW, Fishbein MC. Demonstration of myoglobin and CK-M in myocardium. Comparison of five fixation methods and three immunohistochemical techniques. J Histochem Cytochem 1985; 33:1110-5. [PMID: 3902962 DOI: 10.1177/33.11.3902962] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The results of immunohistochemical staining vary depending on the tissue, fixative, antigen-antibody system, and immunohistochemical staining methods used. The purpose of this study was to evaluate the effect of different methods of fixation, different antigen-antibody systems, and different immunohistochemical methods on immunohistochemical staining of myocardium. Samples of normal fresh canine myocardium from six dogs were fresh frozen and fixed in 10% neutral buffered formalin, Bouin's, Bayley's and Carnoy's fixatives. Immunohistochemical staining for myoglobin and creatine kinase M was performed using the ABC (avidin-biotin complex) and indirect peroxidase-antiperoxidase (PAP) techniques. Tissues fixed in formalin showed the most intense specific staining for both antigens with the least background and nonspecific staining. All other fixation methods and frozen section techniques gave a more variable degree of specific positive staining and substantial background staining and/or nonspecific staining. ABC and PAP techniques gave similar results with both antigen-antibody systems and with each fixation method. Thus, no differences in specificity or sensitivity were observed between ABC and PAP techniques. Differences in staining intensity and pattern were related primarily to differences in fixation methods.
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Rognum TO, Brandtzaeg P, Orjasaeter H, Fausa O. Immunohistochemistry of epithelial cell markers in normal and pathological colon mucosa. Comparison of results based on routine formalin- and cold ethanol-fixation methods. HISTOCHEMISTRY 1980; 67:7-21. [PMID: 6995408 DOI: 10.1007/bf00490083] [Citation(s) in RCA: 38] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The purpose of this study was to examine whether formal-dehyde-fixed tissue may afford reproducible and reliable immunhistochemical results when carcinoembryonic antigen (CEA), secretory component (SC), and epithelial IgA are evaluated semiquantitatively in normal and pathological colon specimens. Proximate tissue samples were processed by routine formalin fixation and by a cold-ethanol fixation method, respectively, and the immunofluorescence intensities obtained for the three antigens were scored. After formalin fixation SC and epithelial IgA were generally undetectable and also the staining for CEA was markedly reduced compared with that seen after ethanol fixation. Significant antigenic "unmasking" was obtained by enzyme treatment of the formalin-fixed tissue sections--resulting in enhanced staining for SC and epithelial IgA but not consistently so for CEA. With this modification scores from duplicate tissue samples processed by the two methods showed significant correlations for all the three epithelial markers; small amounts of CEA and epithelial IgA, and especially SC, nevertheless remained undetectable after formalin fixation. This result should be taken into account when epithelial markers are applied in studies of premalignant lesions of the colon where minor changes in the antigen pattern may be of diagnostic importance.
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Reitamo S, Reitamo JJ. Immunoperoxidase identification of intracellular immunoglobulins in human tissues. Am J Clin Pathol 1978; 70:845. [PMID: 362891 DOI: 10.1093/ajcp/70.5.845] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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Santos-Sacchi J. Differential effects of primary fixation with glutaraldehyde and osmium upon the membranous systems of the strial and external sulcus cells. Acta Otolaryngol 1978; 86:56-63. [PMID: 99973 DOI: 10.3109/00016487809124720] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Ultrastructural preservation of the lateral cochlear wall differs between primary osmium fixation and primary glutaraldehyde fixation. Of significance in this study was the fact that whereas glutaraldehyde fixation preserves the parallel plasma membranes of interdigitations of the strial and external sulcus cells, fixation with osmium occasionally produces a breakdown of selected areas of membranes into apparent vesicles. The occurrence of these membrane artifacts was more common within the external sulcus cells. Reasons for the differential effects of the fixatives may include their differing modes of action. Care should be taken when evaluating unusual ultrastructure, since the type of fixative employed may be causal.
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Rothwell B. The use of osmolality as an aid to establishing consistent fixation quality: studies on the kidney of the domestic fowl. Br Poult Sci 1978; 19:213-8. [PMID: 414827 DOI: 10.1080/00071667808416466] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
1. Using the proximal convoluted tubule of the fowl kidney as indicator tissue the immersion application of fixatives of differing composition and osmolality was studied. 2. The best results were obtained with Dalton's buffered osmium tetroxide and with sodium cacodylate buffered glutaraldehyde followed by osmium post-fixation. 3. The most satisfactory component concentrations in both cases were those which most reproduced a total osmolality close to that of fowl plasma. With both types of fixation the ultrastructural image of the kidney tubule was sensitive to changes in fixative osmolality and differences were clearly identified over a 30 to 50 mOsm range. 4. With glutaraldehyde/osmium double fixation it was found that it was the total osmolality of the glutaraldehyde buffer combination that was to be considered in a study of osmolotic effects, not the osolality of the buffer vehicle alone. 5. The 30 to 50 mOsm difference in fixative osmolality that was able to be detected by studying the image of the kidney tubule was of the order of magnitude commonly experienced as experimental error in the laboratory as a result of changes in reagent batches or error in making up the solutions. The measurement of osmolality therefore provides an ideal quality control to the laboratory make-up of fixative solutions.
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