Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Mitochondrial Dysfunction and Cancer

미토콘드리아 기능 이상과 암

  • Han, Yu-Seon (Department of Molecular Biology, College of Natural Science, Pusan National University) ;
  • Jegal, Myeong-Eun (Department of Molecular Biology, College of Natural Science, Pusan National University) ;
  • Kim, Yung-Jin (Department of Molecular Biology, College of Natural Science, Pusan National University)
  • Received : 2019.07.30
  • Accepted : 2019.09.11
  • Published : 2019.09.30
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Abstract

The mitochondria is the major cellular organelle of energy metabolism for the supply of cellular energy; it also plays an important role in controlling calcium regulation, reactive oxygen species (ROS) production, and apoptosis. Mitochondrial dysfunction causes various diseases, such as neurodegenerative diseases, Lou Gehrig's disease, cardiovascular disease, mental disorders, diabetes, and cancer. Most of the diseases are age-related diseases. In this review, we focus on the roles of mitochondrial dysfunction in cancer. Mitochondrial dysfunction induces carcinogenesis and is found in many cancers. The factors that cause mitochondrial dysfunction differ depending on the types of carcinoma, and those factors could cause cancer malignancy, such as resistance to therapy and metastasis. Mitochondrial dysfunction is caused by a lack of mitochondria, an inability to provide key substances, or a dysfunction in the ATP synthesis machinery. The main factor associated with cancer malignancy is mtDNA depletion. Mitochondrial dysfunction would leads to malignancy through changes in molecular activity or expression, but it is not known in detail which changes lead to cancer malignancy. In order to explore the relationship between mitochondrial dysfunction and cancer malignancy in detail, mitochondria dysfunctional cell lines are constructed using chemical methods such as EtBr treatment or gene editing methods, including shRNA and CRISPR/Cas9. Those mitochondria dysfunctional cell lines are used in the study of various diseases caused by mitochondrial dysfunction, including cancer.

미토콘드리아는 세포 에너지 공급을 위한 에너지 대사의 주요 세포 소기관으로 칼슘 조절, 활성 산소(ROS) 생성, 세포 사멸(apoptosis)을 조절하는데도 중요한 역할을 한다. 이러한 미토콘드리아에 발생한 기능 이상은 신경퇴행질환, 루게릭병, 심혈관계 질환, 정신 질환, 당뇨, 암과 같은 다양한 질병과 연관이 있다. 미토콘드리아 기능 이상 관련 질병들은 노화와 관련된 질병이 주를 차지하며, 이 논문에서는 그 중에서도 암에 초점을 맞춰 서술하고자 한다. 미토콘드리아 기능 이상은 발암을 유도하며, 많은 암 종에서 발견된다. 암종에 따라 미토콘드리아 기능 이상을 일으키는 요인들이 다르며, 이러한 변화는 치료 내성, 전이와 같은 암 악성화도 유발한다. 미토콘드리아 기능 이상의 요인으로는 미토콘드리아 수 부족, 주요 물질 제공 불능, ATP 합성 기능 이상 등이 존재하나, 암 발병과 악성화에 영향을 미치는 주요 원인으로 미토콘드리아 DNA (mtDNA)의 감소(depletion)를 들 수 있다. 미토콘드리아 기능 이상은 분자 활성 변화 혹은 발현 변화를 통해 암 악성화를 일으키나, 어떠한 변화가 암 악성화를 야기하는지 구체적으로 알려진 바가 없다. 미토콘드리아 기능 이상과 암의 상관관계는 대부분 미토콘드리아 기능 이상 세포를 이용하여 연구하는데, 그 제작 방법으로는 EtBr에 의한 화학적 방법과 shRNA, Crispr/Cas9과 같은 유전자 수선 (gene editing) 방법 등이 있다. 이러한 기법으로 제작된 미토콘드리아 기능 이상 세포주는 암을 비롯한 미토콘드리아 기능 이상에 의한 다양한 질병 연구에 이용되고 있다.

Keywords

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