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The effect of tissue decalcification on mRNA retention within bone for in-situ hybridization studies
L Walsh1, A J Freemont, J A Hoyland
1Department of Rheumatology, University of Manchester, UK.
Abstract:
Tissue decalcification is a routine part of the preparation of bone tissue for histological studies. Although in-situ hybridization has been employed to localize mRNA of collagenous and non-collagenous bone related proteins in skeletal tissue, little is known regarding the effects of decalcifying agents on mRNA retention within tissue. In this study in-situ hybridization using an oligonucleotide probe (i.e. a poly d(T) probe) to detect total messenger RNA has been employed to investigate the effects of the decalcifying agents nitric acid, formic acid and EDTA on mRNA retention compared to undeacalcified tissue. The results show that formalin fixation and EDTA decalcification preserve substantial amounts of mRNA within the tissue. In particular, this study illustrates that it is possible to perform in-situ hybridization on formalin fixed decalcified paraffin embedded tissue.
Insights
Decalcifying bone tissue for histology can degrade messenger RNA (mRNA). Formalin fixation and EDTA decalcification effectively preserve mRNA, enabling in-situ hybridization on prepared bone samples.
Area of Science:
- Histology
- Molecular Biology
- Biochemistry
Background:
- Tissue decalcification is essential for bone histology.
- The impact of decalcifying agents on messenger RNA (mRNA) retention is poorly understood.
- In-situ hybridization (ISH) is a key technique for localizing nucleic acids in tissues.
Purpose of the Study:
- To investigate the effects of common decalcifying agents on mRNA retention in bone tissue.
- To compare mRNA preservation using nitric acid, formic acid, and EDTA.
- To determine the feasibility of performing ISH on decalcified bone samples.
Main Methods:
- Bone tissue samples were subjected to decalcification using nitric acid, formic acid, or EDTA.
- In-situ hybridization was performed using a poly d(T) probe to detect total mRNA.
- Results were compared between decalcified and undeacalcified tissue samples.
Main Results:
- Formalin fixation and EDTA decalcification demonstrated significant preservation of mRNA within the bone tissue.
- Nitric acid and formic acid treatments resulted in lower levels of detectable mRNA.
- Successful in-situ hybridization was achieved on formalin-fixed, EDTA-decalcified, paraffin-embedded bone tissue.
Conclusions:
- EDTA decalcification, combined with formalin fixation, is a suitable method for preserving mRNA in bone tissue for histological analysis.
- This approach enables the application of in-situ hybridization techniques to study gene expression in decalcified bone samples.
- Researchers can confidently use formalin-fixed, EDTA-decalcified bone for molecular studies involving mRNA detection.