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자료유형
학술저널
저자정보
저널정보
대한생화학·분자생물학회 Experimental and Molecular Medicine Experimental and Molecular Medicine 제34권 제3호
발행연도
2002.1
수록면
201 - 210 (10page)

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A20 murine lymphoma cells undergoing Fas-medi-ated apoptosis showed increase in the activity ofphospholipase D (PLD), which is involved in prolifera-tive or mitogenic cellular responses. Using A20 celllines that were resistant to Fas-induced apoptosis, weinvestigated the diferential effects of Fas cross-link-ing on PLD activity and sphingolipid metabolism. Thebasal PLD activities in all of the selected three Fas-resistant clones (#5, #8, and #11) were about 2~4 foldshigher than that of wild type A20 cels. Among thePLD isoforms, PLD2 expression was increased in alof the selected Fas-resistant clones. The Fas down-stream signaling events triggered by Fas cross-link-ing, including the activations of PLD, phosphatidy-lcholine-specific phospholipase C (PC-PLC), sphingo-myelinase (SMase), the increase in diacylglycerol(DAG) and protein phosphorylation levels, and thetranslocation of protein kinase C to membrane werenot changed in both of Fas-resistant clone #5 and #8.In contrast, Fas cross-linking stimulated the activity ofPLD, PC-PLC, and SMase, translocation of PKC, andprotein phosphorylation in Fas-resistant clone #11,similar to that of wild type cells. We also found thatclone #1 had a different Fas sequence encoding FasB which has been known to inhibit Fas-induced apo-ptosis. These findings suggest that increased PLD2expression resulting in increased basal PLD activityand the blockade of Fas downstream signaling cas-cades may be involved to limit apoptosis induced byFas cross-linking.

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