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We developed an in situ hybridization technique for measurement of proliferative cell numbers through detection of histone mRNA in routinely fixed, paraffin-embedded tissue sections. Histone gene expression is coordinated with the cell cycle, and the increase in expression during S-phase permits unambiguous identification of cells undergoing DNA replication. Histone mRNAs were identified in routinely processed rat liver tissue by non-isotopic in situ hybridization with digoxigenin-labeled oligonucleotide probes. Specific hybrids were detected with alkaline phosphatase-labeled anti-digoxigenin antibody and visualized by BCIP-nitroblue tetrazolium indicator substrate. Unequivocal cytoplasmic labeling was observed in various cell types in the liver remnant during the first 72 hr after a two-thirds partial hepatectomy. The spatial and temporal patterns of histone labeling were almost identical to those obtained by staining with an antibody to bromodeoxyuridine. The identification of histone mRNA appears to be a reliable marker of the S-phase fraction, a technique with the further advantage that the tissue does not have to be first exposed to a nucleotide analogue. Hence, retrospective studies are possible. The probes can be applied to human and animal cells and tissues because the nucleotide sequences of histone genes are conserved.

Liver regeneration: a comparison of in situ hybridization for histone mRNA with bromodeoxyuridine labeling for the detection of S-phase cells.