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NTIS 바로가기韓國營養學會誌 = The Korean journal of nutrition., v.42 no.5, 2009년, pp.423 - 433
민혜선 (한남대학교 생명나노과학대학 식품영양학과) , 김미숙 (한남대학교 생명나노과학대학 식품영양학과)
Folate and vitamin
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핵심어 | 질문 | 논문에서 추출한 답변 |
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엽산과 비타민 B12 결핍으로 SAM과 SAH의 비율의 변화는 어떤 결과를 초래하는가? | 18,19) SAM은 DNA 메틸화 뿐 아니라 epinephrine과 phosphatidylethanolamine과 같은 신경전달물질 의 합성에 필수적인 역할을 하므로 뇌조직에서 가장 중요한 메틸 공여체로 작용한다.20) 따라서 엽산 또는 비타민 B12가 결핍되면 SAM 합성의 저하와 SAH 합성의 증가로 인해 SAM/SAH 비율이 저하됨으로써 DNA 손상을 일으켜 세 포사멸을 가져오므로, 호모시스테인이 신경계에 간접적으로 독성을 나타내는 것으로 보고하였다.14) | |
호모시스테인혈증은 어떤 상태에서 나타나는가? | 역학조사 및 임상연구에서 호모시스테인혈증이 동맥경화 성 심혈관계질환, 뇌졸중, 말초동맥경색질환 및 정맥전색의 독립적인 위험인자로 밝혀졌으며,3,5) 인지능력손상, 치매, 알 츠하이머 및 우울증과 같은 신경계질환의 위험인자로도 보 고되었다.3,31-33) 호모시스테인혈증은 엽산 또는 비타민 B12 가 결핍되거나 메티오닌 대사회로의 일부 효소활성이 결여 되어 메티오닌 대사에 장애가 있을 때 나타난다. 엽산과 비 타민 B12는 메티오닌 대사회로에 영향을 줌으로써 DNA 메 틸화에 필요한 SAM의 합성 및 조직내 SAH의 수준을 유 지시킴으로써 신경세포 및 혈관계의 기능을 정상으로 유지 하는 것으로 제안되었으므로,30-32) 본 연구에서는 흰쥐를 대 상으로 식이에 엽산과 비타민 B12를 결핍시켜 경미한 호모 시스테인혈증 또는 중위의 호모시스테인혈증을 유발하였으 며 (Fig. | |
SAM의 역할은? | 14,16,17) 즉, 엽산 또는 비타민 B12가 결핍되 었을 때 뇌조직의 S-adenosylmethionine (SAM) 농도가 저하되고 S-adenosylhomocysteine (SAH) 농도가 증가 되어 저메틸화를 가져오기 때문에 신경이 손상되는 것으로 제안하였다.18,19) SAM은 DNA 메틸화 뿐 아니라 epinephrine과 phosphatidylethanolamine과 같은 신경전달물질 의 합성에 필수적인 역할을 하므로 뇌조직에서 가장 중요한 메틸 공여체로 작용한다.20) 따라서 엽산 또는 비타민 B12가 결핍되면 SAM 합성의 저하와 SAH 합성의 증가로 인해 SAM/SAH 비율이 저하됨으로써 DNA 손상을 일으켜 세 포사멸을 가져오므로, 호모시스테인이 신경계에 간접적으로 독성을 나타내는 것으로 보고하였다. |
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