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논문 상세정보

BCG가 Ehrlich 암세포를 이식한 생쥐의 위점막 상피세포의 DNA합성 및 미세구조에 미치는 영향

Effects of BCG on the DNA Synthesis and Ultrastructure of Mouse Gastric Mucosal Epithelial Cells Inoculated with Ehrlich Carcinoma Cells

초록

이 실험은 Ehrlich 종양세포를 이식한 후 BCG를 투여하였을 때, 위점막 상피세포의 형태학적 변화와 DNA합성능의 변화를 연구하고자 시행하였다. 실험동물로는 체중 25 g 내외의 성숙한 생쥐(ICR계통)를 정상대조군, 종양세포이식대조군(종양대조군), 종양세포이식후 BCG투여군(BCG투여군)으로 구분하였다. 종양대조군과 BCG투여군 동물들은 샅부위 피하에 각각 $1{\times}10^7$의 Ehrlich 종양세포를 이식한 후, 다음날부터 BCG ($0.6{\times}10^8{\sim}6.4{\times}10^8$ CFU, 27 mg/vial, Connaught Lab., Canada)를 하루건너 한 번씩 피부밑조직에 주사하였으며, 종양대조군은 종양세포이식 후에 BCG 대신 0.2mL의 생리식염수를 피부밑조직에 주사하였다. 자기방사법적 관찰을 위해서는 BCG를 마지막으로 주사한 다음날 $^3H$-thymidine (methyl-$^3H$-thymidine: specific activity 25 Ci/mmol, Amersham Lab., England) 0.7${\mu}Ci/gm$를 꼬리정맥에 주사하고, 70분 후 도살하여 위조직을 떼어내어 10% formalin에 고정하였다. 자기방사표본관찰은 위점막 조직이 세로로 잘 절단된 부위를 택하여 점막근육판을 따라 점막길이 3.5mm의 위점막 조직에 분포하는 $^3H$-thymidine 표지세포의 수를 계수하였으며, 일반조직 관찰을 위해서는 hematoxylin-eosin (H-E)염색을 시행하였다. 전자현미경 관찰을 위해서는 떼어낸 위조직을 2.5% glutaraldehyde-1.5% paraformaldehyde 혼합액에 고정한 후, 1% osmium tetroxide 액에 다시 고정하였으며, 고정이 끝난 조직은 탈수과정을 거쳐 araldite 혼합액에 포매하였다. 광학현미경적 관찰에서 종양대조군과 BCG투여군은 위점막 조직에서 형태적으로 큰 변화를 볼 수 없었다. 전자현미경적 관찰에서 BCG투여군의 점액상피세포는 전체적인 모습이 정상대조군과 종양대조군의 소견과 유사하였으나 정상대조군과 종양대조군에 비해 수초구조와 뭇소포체(multivesicular body) 및 전자밀도가 높은 큰 미토콘드리아속과립이 자주 관찰되었다. 자기방사법적 관찰에서 정상대조군, 종양대조군, BCG투여군은 점막길이 3.5 mm 당 출현하는 표지세포수가 각각 380.2 (${\pm}31.35$), 426.1 (${\pm}28.43$) 및 301.8 (${\pm}34.63$)개이었으며, BCG투여군은 정상대조군과 종양대조군에 비하여 표지된 은입자의 수가 매우 적어서 표지과립이 겨우 구별될 정도의 세포가 많이 관찰되었다. 이상의 결과를 종합해보면 Ehrlich 종양세포를 이식한 동물에 BCG를 반복 투여하면 위점막 상피세포의 DNA합성을 효과적으로 억제하면서도 형태적인 변화가 매우 경미하였으며, 이러한 결과는 BCG가 항암치료 시 보조제로 사용할 수 있는 좋은 약제라고 생각된다.

Abstract

This experiment was performed to evaluate the morphological responses of the gastric epithelial cells of the mouse, inoculated with Ehrlich carcinoma cells in the inguinal area, following administration of BCG. Healthy adult ICR mice weighing 25 gm each were divided into normal and experimental groups (tumor control group and BCG-treated group). 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.: $0.03{\times}10^8{\sim}0.32{\times}10^8$ 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 gastric 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. The number of labeled epithelial cells in the gastric mucosae (mean number of labeled epithelial cells per 3.5 mm length of mucosa) were observed and calculated. And for electron microscopic observation, gastric tissues were prefixed with 2.5% glutaraldehyde-1.5% paraformaldehyde solution, followed by post-fixation with 1% osmium tetroxide solution. On the light microscopic study, gastric mucosae had no morphological changes following the injection of BCG. On the electron microscopic study, in the BCG-treated mice, myelin figures and multivesicular bodies within the gastric epithelial cells were observed more frequently than in 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 380.2 (${\pm}31.35$), 426.1 (${\pm}28.43$) and 301.8 (${\pm}34.63$), respectively. In the BCG-treated mice, poorly-labeled cells containing only a few silver grains of 3H-thymidine were observed more frequently as compared in those of the normal control and tumor control ones. From the above results, BCG may suppress the DNA synthesis of the gastric epithelial cells, but does not results severe fine structural defect on the gastric epithelial cells. These results suggest that BCG is expected as one of the effective supplemental anticancer drugs.

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이 논문을 인용한 문헌 (1)

  1. Ko, Eun-Ju ; Park, Kyung-Ho ; Park, Dae-Kyoon ; Kim, Duk-Soo ; Ko, Jeong-Sik 2011. "Ultrastructural Alterations in the Gastric Mucous Epithelial Cells of Mouse Inoculated with Ehrlich Carcinoma Cells, Induced by 5-Fluorouracil, Mitomycin C or Acriflavine-Guanosine Compound (AG60)" 한국현미경학회지 = Korean journal of microscopy, 41(1): 1~11 

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