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Histone H3 Messenger RNA in Situ Hybridization for Identifying Proliferating Cells in Formalin-fixed Rat Gastric Mucosa

Overview
Journal Histochem J
Specialty Biochemistry
Date 1998 Feb 18
PMID 9466154
Citations 4
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Abstract

To devise a more sensitive method for identifying proliferative cells in routinely formalin-fixed, paraffin-embedded tissues, we applied an in situ hybridization (ISH) technique for the detection of histone H3 mRNA in rat gastric mucosa and amplified the signal by a silver intensification method. ISH was performed using a Fluorescein-labelled, single-stranded DNA probe for the human histone H3 gene. To determine the optimal conditions for detecting H3 mRNA in rat gastric mucosa, we tested the effect of changing conditions, such as fixation time and digestion time, by a proteinase before hybridization. Next, the proliferation indices obtained using H3 ISH were compared with those obtained using bromodeoxyuridine (BrdU) immunohistochemistry. In normal rat gastric mucosa, H3 ISH- and BrdU-positive cells were confined to the neck region of both fundic and pyloric mucosa. The two labelling indices were almost the same. In all the serial sections studied, H3 ISH-positive cells were almost always BrdU-positive too. Taken together, these results indicate that the H3 ISH technique is useful for the evaluation of proliferative activity in gastric epithelial cells by virtue of its detection of S-phase cells.

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