Use of Cellulose and Recent Research into Butyrate

국문 초록 (Abstract)

지구상에는 약 5,400여 종의 포유동물이 있고 그 중 약 1,000여 종은 풀을 뜯어 먹고 사는 초식동물이다. 초식 동물 중에서 약 250여 종이 반추동물로 알려져 있다. 반추동물인 소와 양은 반추위에서 주로 발효가 일어나지만 비반추동물인 돼지와 사람은 맹장과 결장, 직장에서 주로 발효가 일어난다. 반추위 미생물의 종류와 우점도 Bacteroidetes 51%, Firmicutes 43% 존재하며, 사람의 대장미생물의 우점도Firmicutes 65%, Bacteroidetes 25%로 존재 한다. 풀의 세포벽 구성성분은 미생물에 의해 분해, 발효에 의해 SCFA (short chain fatty acid)를 생성하게 되고 acetate, propionate, butyrate 생성비율은 60:25:15이다. 장내 primary butyrate transporter인 MCT1 (monocarboxylatetransports-1)에 의해서 흡수된 butyrate는 SCFA receptor GPR43과 GPR41을 활성화시킨다. Butyrate는 강력한 anti-tumorigenic 기능을 가지고 있다. Butyrate는 다양한 cancer cell에 효과를 나타내며 세포 내의 기능 조절에 기여하고, 암세포사멸을 유도하는 특성이 있다. Butyrate는 caspase의 활성화, HDAC (histone deacetylase) 활성을 억제하여apoptosis를 유도하고, p53 발현증가로 cell cycle arrest와 apoptosis를 유도한다. SCFA의 항 염증작용으로는 장 상피세포에서 IL-8 발현 감소, NO합성과 NF-kB (nuclear factor kB)의 활성을 억제하여 염증으로 인한 암 발생을 억제한다. Butyrate는 장 점막의 생리적 기능을 유지하는데 중요한 역할을 하며 IBD (inflammatory bowel disease) 치료법으로 이용되고 있다.

다국어 초록 (Multilingual Abstract)

On earth, there are about 5,400 kinds of mammals, of which about 1,000 kinds are herbivores. Among herbivores, about 250 kinds are known to be ruminants. As for cattle and sheep, which are ruminants, fermentation takes places mainly in their rumen; in contrast, for pigs and men, which are non-ruminants, fermentation takes place mainly in their caecum, colon, and rectum. As for the kind and dominance of rumen microorganisms, Bacteroidetes account for 51% and Firmicutes for 43%. As for the dominance of the large intestine microorganisms in men, Firmicutes account for 65% and Bacteroidetes for 25%. Cell wall components are decomposed by microorganisms, and short chain fatty acids (SCFAs) are generated through fermentation; the ratio of acetate, propionate, and butyrate generate is 60:25:15. Butyrate absorbed through the primary butyrate transporter MCT1 (mono carboxylate transports-1) in the intestines activates such SCFA receptors as GPR43 and GPR41. Butyrate has a strong anti-tumorigenic function. Butyrate is characterized by the fact that it has an effect on many cancer cells, contributes to the coordination of functions in the cells, and induces cancer apoptosis. Butyrate activates caspase but inhibits the activity of HDAC (histone deacetylase), so as to induce apoptosis. In addition, it increases p53 expression, so as to induce cell cycle arrest and apoptosis. Anti-inflammation actions of SCFA include the reduction of IL-8 expression in intestinal epithelial cells, the inhibition of NO synthesis, and the restraint of the activity of NF-kB (nuclear factor kB), so as to suppress the occurrence of cancers caused by inflammation. Butyrate plays an important role in maintaining physiological functions of intestinal mucous membranes and is used as a cure for inflammatory bowel disease (IBD).

목차 (Table of Contents)

• abstract
• Digestive organ of ruminant and mono-gastric animals
• Ruminant microorganisms
• Microorganisms in the intestines of men
• Microorganisms that decompose polysaccharide
• SCFAs
• Anti-tumorigenic properties of butyrate
• Regulation of Inflammation by butyrate
• Conclusions
• References
• 초록

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