Abstract

ABSTRACT The current study was undertaken to determine the effect of conjugated linoleic acid (CLA) isomers, cis-9, cis-11 (c9c11), cis-9, trans-11 (c9t11), trans-9, trans-11 (t9t11), trans-10, cis-12 (t10c12) on differentiation of pig preadipocytes and myogenic satellite cells during culture. Cells were isolated from new born pigs. The t10c12 isomer decreased differentiation of pig preadipocytes (92%), but not that of myogenic cells. The t9t11 isomer decreased differentiation of preadipocytes (14%) and increased that of myogenic cells (26%). No other CLA isomers affected differentiation of preadipocytes or myogenic cells. The effects of CLA on proliferation of preadipocytes and myogenic cells were small, compared to the effects on differentiation. These results suggest that CLA isomers have different effects on differentiaton of pig preadipocytes and myogenic cells. ( Key words : CLA, Pig, Preadipocyte, Myogenic satellite cells, Differentiation) . 서 론 Conjugated linoleic acid(CLA)는 linoleic acid (LA)의 이성체로서, LA는 이중결합이 9번과 12번 탄소에 있고, 모두 cis형인데, CLA는 이중결합이 9번과 11번 또는 10번과 12번 등의 탄소에 있고, cis형 뿐만 아니라 trans형도 있다. CLA의 항암작용, 항동맥경화작용, 항비만작용 등이 알려졌기에(Pariza 등 2000; Brown과 Mclntosh, 2003; Azain, 2004), 최근에 와서 건강보조제로서 주목을 받게 되었다. CLA의 가축의 생산과 관련된 작용으로는 지방축적 억제작용이 중요시되고 있는데 돼지에게 CLA를 급여한 결과 지방축적이 억제되었음이 보고되었다(Dugan등, 1997; Ostrowska 등, 2003; Dugan 등, 2004). 이에 대한 작용 구명과 관련해서 CLA의 지방전구세포의 분화에 미치는 작용에 대한 연구가 수행되어 왔다(Brodie 등, 1999; Evans 등, 2001; Kang 등, 2003). Brown 등(2003)은 trans-10, cis-12 CLA가 사람 지방전구세포의 분화를 억제했다고 보고했는데 McNeel 과 Mersmann(2003) 돼지 지방전구세포를 이용한 실험에서 CLA가

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