Effects of short and long-term alcohol-based fixation on Sprague-Dawley rat tissue morphology, protein and nucleic acid preservation.
Alcohol
DNA
Fixative
Formaldehyde
Immunohistochemistry
Pathology
RNA
Journal
Acta histochemica
ISSN: 1618-0372
Titre abrégé: Acta Histochem
Pays: Germany
ID NLM: 0370320
Informations de publication
Date de publication:
Aug 2019
Aug 2019
Historique:
received:
11
05
2019
revised:
29
05
2019
accepted:
31
05
2019
pubmed:
7
7
2019
medline:
27
12
2019
entrez:
7
7
2019
Statut:
ppublish
Résumé
Safety concerns on the toxic and carcinogenic effects of formalin exposure have drawn increasing attention to the search for alternative low risk fixatives for processing tissue specimens in laboratories worldwide. Alcohol-based fixatives are considered some of the most promising alternatives. We evaluated the performance of alcohol-fixed paraffin-embedded (AFPE) samples from Sprague-Dawley (SD) rats analyzing tissue morphology, protein and nucleic acid preservation after short and extremely long fixation times (up to 7 years), using formalin-fixed paraffin-embedded (FFPE) samples as a comparator fixative. Following short and long-term alcohol fixation, tissue morphology and cellular details in tissues, evaluated by scoring stained sections (Hematoxylin-Eosin and Mallory's trichrome), were optimally preserved if compared to formalin fixation. Immunoreactivity of proteins (Ki67, CD3, PAX5, CD68), evaluated by immunohistochemistry, showed satisfactory results when the fixation period did not exceed 1 year. Finally, we confirm the superiority of alcohol fixation compared to formalin, in terms of quantity of nucleic acid extracted from paraffin blocks, even after an extremely long time of alcohol fixation. Our results confirm that alcohol fixation is a suitable and safe alternative to formalin for pathological evaluations. There is a need for standardization of formalin-free methods and harmonization of diagnosis in pathology department worldwide.
Identifiants
pubmed: 31277893
pii: S0065-1281(19)30163-1
doi: 10.1016/j.acthis.2019.05.011
pmc: PMC6939362
mid: NIHMS1546614
pii:
doi:
Substances chimiques
Fixatives
0
Ethanol
3K9958V90M
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
750-760Subventions
Organisme : Intramural NIH HHS
ID : Z01 ES010017
Pays : United States
Informations de copyright
Copyright © 2019 Elsevier GmbH. All rights reserved.
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