Applied Microscopy

Korean Society of Microscopy (한국현미경학회)
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Laminin-1 Expression in Bone Marrow Stromal Cells of Cyclophosphamide-treated Rat

Cyclophosphamide가 흰쥐 골수의 기질세포에서 Laminin-1의 발현에 미치는 영향

  • Lee, Chang-Hun (Department of Anatomy & Cell Biology, Hanyang University) ;
  • Chung, Ho-Sam (Department of Anatomy & Cell Biology, Hanyang University) ;
  • Paik, Doo-Jin (Department of Anatomy & Cell Biology, Hanyang University) ;
  • Hwang, Se-Jin (Department of Anatomy & Cell Biology, Hanyang University) ;
  • Kim, Won-Kyu (Department of Anatomy & Cell Biology, Hanyang University) ;
  • Youn, Jee-Hee (Department of Anatomy & Cell Biology, Hanyang University) ;
  • Kim, Chong-Kwan (Department Orthopedic surgery, College of Medicine Sungkyunkwan University)
  • 이창훈 (한양대학교 의과대학 해부.세포생물학교실) ;
  • 정호삼 (한양대학교 의과대학 해부.세포생물학교실) ;
  • 백두진 (한양대학교 의과대학 해부.세포생물학교실) ;
  • 황세진 (한양대학교 의과대학 해부.세포생물학교실) ;
  • 김원규 (한양대학교 의과대학 해부.세포생물학교실) ;
  • 윤지희 (한양대학교 의과대학 해부.세포생물학교실) ;
  • 김종관 (성균관대학교 의과대학 정형외과학교실)
  • Published : 2002.12.01
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Abstract

The purpose of the present study is to investigate whether stromal cells supporting specific microenvironment for hematopoiesis of bone marrow are affected by toxicants and therapeutic drugs such as antibiotics and anticancer drugs and whether laminin-1 is associated with such effects. SD rats were intraperitoneally injected with 75 mg/kg of cyclophosphamide which is widely used to treat infant's solid tumor, leukemia and myeloma and sacrificed after 3 days, 1 week, 3 weeks or 5 weeks of injection. The bone marrow extracted and paraffin-sectioned was analyzed using immunohistochemical staining. A part of tissues was subjected to electron microscopy following reaction with rabbit anti-laminin antibody, biotinylated goat anti-rabbit IgG conjugated with 12 nm gold particles, and staining with uranyl acetate. 1. The bone marrow tissue at day 3 post injection with cyclophosphamide displayed dilated venous sinus, partial necrotic death, and decreased number of hematopoietic cells. Laminin-1 was intensively stained in the reticular and adipose tissues. 2. Up to 5 weeks post injection, laminin-1 was stained at a low level in the stromal tissue of bone marrow and the number of hematopoietic cell was increased. 3. Deposition of the gold particle which represents laminin-1 expression was observed at the highest level in the stromal cells of bone marrow obtained 3 days after injection, and decreased after 1 to 5 weeks. These results suggest that stromal cells which play a role in supporting microenvironment for bone marrow hematopoiesis augment induction of laminin-1 expression and activation upon administration of cyclophosphamide.

골수내 정상적인 혈구형성은 줄기세포와 주위의 미세환경 사이에 일어나는 상호작용에 의해서 좌우된다고 알려져 있다. 이때 미세환경은 성장요소, 기질세포 및 기질세포가 분비한 세포외기질의 복잡한 망상구조로 이루어져 있다. 골수의 세포외기질은 거대분자로 구성되어 있으며 이중 구성요소의 일부인 당단백이 혈구형성의 조절에 주요한 요소가 된다고 많은 학자들이 주장해 왔다. 골수의 기질을 이루고 있는 망상세포, 지방세포, 섬유모세포, 혈관내피세포 및 혈관주위세포 등이 분비하는 세포외기질에 여러종류의 laminin 동형체가 함유되어 있으며 여러 종류의 혈구형성에 주요한 역할을 한다는 연구보고가 있다. 저자는 골수내 종양을 치료하기 위해 빈번히 사용되는 cyclophosphamide가 골수에 미치는 영향을 규명하고자 실험동물의 혈구형성에 영향을 미치는 laminin-1의 발현의 변화를 골수의 기질세포에서 추적하고자 하였다. 건강한 SD계 흰쥐를 실험동물로 사용하여 cyclophosphamide를 체중 kg당 75 mg을 복강내로 1회 투여하고 3일, 1주, 3주 및 5주 후 희생하여 골수조직을 채취하여 면역조직염색법으로 염색하여 laminin-1의 골수내 분포의 변화를 관찰하였고, 일부 조직은 전자현미경표본을 제작하여 1차 항체(rabbit anti-laminin)로 반응시킨 후 직경 12 nm의 금과립이 섞인 제2차 항체(biotinylated goat anti-rabbit IgG)로 다시 반응시키고 uranyl acetate로 단일염색 후 전자현미경으로 관찰하여 다음과 같은 결과를 얻었다. 1. Cyclophosphamide 투여 후 3일 경과군의 흰쥐 골수조직은 정맥동이 확장 되었고, 일부 조직이 괴사되었으며, 혈구형성세포가 감소되었다. 망상조직과 지방세포사이의 조직에서 laminin-1의 면역반응이 강하게 나타났다. 2. Cyclophosphamide 투여 후 1주, 2주 및 5주 투여군의 골수에서 laminin-1의 약한 면역반응이 기질조직에 계속되었고 혈구형성세포의 수는 증가되었다. 3. Laminin-1의 면역반응을 나타내는 금과립은 cyclophosphamide 투여 3일군의 골수 기질세포에서 가장 많은 수가 관찰되었고, 투여 1주, 3주 및 5주군에서는 금과립의 수량이 감소되었다. 이상과 같은 실험결과는 cyclophosphamide가 흰쥐에 투여되었을 때 골수의 혈구형성의 미세환경을 유지하는 기질세포의 laminin-1의 발현을 증가시키는 것으로 생각되었다.

Keywords

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