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Effects of Bacillus Calmette-Guerin (BCG) on the DNA Synthesis of Mouse Duodenal Mucosal Epithelial Cells Inoculated with Ehrlich Carcinoma Cells  

Ko, Jeong-Sik (Department of Anatomy, College of Medicine Soonchunhyang University)
Kim, Heung-No (Department of Anatomy, College of Medicine Soonchunhyang University)
Park, Kyung-Ho (Department of Anatomy, College of Medicine Soonchunhyang University)
Park, Dae-Kyoon (Department of Anatomy, College of Medicine Soonchunhyang University)
Kim, Duk-Soo (Department of Anatomy, College of Medicine Soonchunhyang University)
Publication Information
Applied Microscopy / v.40, no.4, 2010 , pp. 193-200 More about this Journal
Abstract
This experiment was performed to evaluate the morphological responses of the duodenal epithelial cells of the mouse, inoculated with Ehrlich carcinoma cells in the inguinal area, following administration of Bacillus Calmette-Guerin (BCG). In the experimental groups, each mouse was inoculated with $1{\times}10^7$ Ehrlich carcinoma cells subcutaneously in the inguinal area. From next day after inoculations, 0.2 mL of saline or BCG (0.5 mL/25 g B.W.: $0.03{\times}10^8\sim0.32{\times}10^8$ CFU) were injected subcutaneously to the animals every other day, respectively. The day following the 7th injection of saline or BCG, each mouse was injected with a single dose of $0.7{\mu}Ci$/g of methyl-$^3H$-thymidine (25 Ci/mmol, Amersham Lab, England) through tail vein. Seventy minutes after the thymidine injection, animals were sacrificed, and duodenal tissues were taken and fixed in 10% neutral formalin. Deparaffinized sections were coated with autoradiographic emulsion EM-1 (Amersham Lab, England) in a dark room and dried and were placed in a light-tight box. The number of labeled epithelial cells in the duodenal mucosae (mean number of labeled epithelial cells per 3.5 mm length of mucosa) were observed and calculated. On the light microscopic study, duodenal mucosae had no severe morphological changes following the injection of BCG. In the tumor control and BCG treated groups, a number of small lymphocytes and eosinophile leucocytes are slightly increased as compared with those of the normal control ones. On the autoradiographic study, number of the labeled cells of normal control, tumor control and BCG-treated mice were 632.3 (${\pm}14.47$), 761.7 (${\pm}27.65$) and 505.0 (${\pm}17.09$) respectively. From the above results, BCG may suppress the DNA synthesis of the duodenal epithelial cells, but does not results severe structural defect on the duodenal mucosae. And it is suggested that BCG may greatly improve the anticancer therapy on certain kind of cancer.
Keywords
Duodenal epithelial cell; BCG (Bacillus Calmette-Guerin); Anticancer drug; Autoradiography; DNA synthesis;
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