Detection of Different MRnas Expressed in the Thyro-parathyroid Complex of the Rat by in Situ Hybridization Using Digoxigenin-labelled Oligonucleotide Probes

Overview

Journal Histochem J

Specialty Biochemistry

Date 2000 Jun 29

PMID 10872886

Authors

J M Fernandez-Santos

I Martin-Lacave

Affiliations

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Abstract

The effects have been examined of different methods and regimens for tissue fixation, preservation, permeabilization and immunostaining of different mRNAs detected by in situ hybridization in paraffin-embedded samples. The three main hormone mRNAs expressed in the thyro-parathyroid glands, namely thyroglobulin, calcitonin and parathyroid hormone mRNAs, were chosen as the target nucleic acid sequences to be detected using digoxigenin-labelled probes. Our results suggest that chemical fixation and permeabilization of tissue samples are restrictive steps. Thus, paraformaldehyde fixation provides excellent signal intensities and non-detectable background levels whereas routine formalin and Bouin's solution give unsatisfactory results. A clear linear correlation was also found between signal intensity and proteinase K permeabilization. Moreover, the optimization of immunohistochemical steps, such as anti-digoxigenin antibody concentration and colour development times, enhance the intensity and specificity of hybrid signals. Furthermore, our results show that, in contrast to some data in the literature, paraffin-embedded tissue is suitable for detection of mRNAs by in situ hybridization. It gives equivalent intensities of specific signal and superior histological and cellular resolutions when compared to cryopreserved tissue.

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