The assessment of cell proliferation during 9,10-dimethyl-1,2-benzanthracene-induced hamster tongue carcinogenesis by means of histone H3 mRNA in situ hybridization.
The aim of this study was to investigate cell kinetics and ultrastructural changes during carcinogenesis using a hamster 9,10-dimethyl-1,2-benzanthracene (DMBA)-induced tongue cancer model. Five squamous cell carcinomas, five dysplastic epithelia, seven hyperplastic epithelia, and four normal epithelia were obtained from 21 hamster tongues by applying 1.0% acetone solution of DMBA on the left lingual mucosa after scratching with a root canal broach. Ultrastructural examination revealed that the number of microvilli increased, whereas that of desmosomes decreased during carcinogenesis. Cell proliferation was analyzed by means of 5-bromodeoxyuridine (BrdU) immunohistochemistry and in situ hybridization (ISH) for histone H3 mRNA. The BrdU and histone H3 mRNA labeling indices (LIs) were lowest for normal epithelium, higher for hyperplastic and dysplastic epithelia, and highest for squamous cell carcinoma. Cytoplasmic histone H3 mRNA and nuclear BrdU were localized in virtually identical areas of serial sections. The correlation coefficient for the relationship between these two LIs was 0.97 ( P << 0.001). These results suggest that the assessment of cell proliferation using H3 mRNA ISH will be a useful technique for investigating biological behavior during carcinogenesis.
Sakamoto
Ryoichi
R
First Department of Oral and Maxillofacial Surgery, Kagoshima University Dental School, 8-35-1 Sakuragaoka, 890-8544, Kagoshima, Japan.
Nitta
Tetsuya
T
Kamikawa
Yoshiaki
Y
Sugihara
Kazumasa
K
Hasui
Kazuhisa
K
Tsuyama
Shinichiro
S
Murata
Fusayoshi
F
D015127:9,10-Dimethyl-1,2-benzanthracene; D000818:Animals; D002294:Carcinoma, Squamous Cell / Q000139:chemically induced* / Q000235:genetics / Q000473:pathology / Q000648:ultrastructure; D002455:Cell Division; D006224:Cricetinae; D006657:Histones / Q000235:genetics*; D017403:In Situ Hybridization; D008297:Male; D008647:Mesocricetus; D008940:Mitotic Index; D009061:Mouth Mucosa / Q000187:drug effects / Q000473:pathology* / Q000648:ultrastructure; D012333:RNA, Messenger / Q000235:genetics; D014062:Tongue Neoplasms / Q000139:chemically induced* / Q000235:genetics / Q000473:pathology / Q000648:ultrastructure
D006657:Histones; D012333:RNA, Messenger; D015127:9,10-Dimethyl-1,2-benzanthracene