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. 2008 Nov 17;183(4):681–696. doi: 10.1083/jcb.200803129

Figure 5.

Figure 5.

Caspase-8 activity is abrogated in tafazzin-deficient cells. (A) Control lymphoblastoid cells (DB037, lanes 1 and 3; DB015, lanes 2 and 4) and Barth syndrome–derived lymphoblastoid cells (DB105.2, lanes 5 and 7; DB105.3, lanes 6 and 8) were either untreated or treated with anti-Fas antibody (Fas) for 14 h. Total cells extract was analyzed by Western blotting for Bid levels. After digital scanning of the immunoblot, the intensities of Bid levels as a percentage of actin levels were plotted (bottom). (B) Control (shCont1) and tafazzin-knockdown (shTaz1) HeLa cells were either untreated or treated with anti-Fas antibody for 14 h, and analyzed as in A. (C) Mitochondria were isolated from the indicated cells treated as in B, and the tBid levels on the mitochondria were analyzed by Western blotting. Subunit 6 of complex I was used as a mitochondrial marker and loading control. After digital scanning of the immunoblot, the intensities of tBid levels as a percentage of complex I levels were plotted (bottom). (D and E) The indicated control or tafazzin-deficient cells were treated as in A and analyzed for IETDase (caspase-8–like) activity. Error bars represent ± standard deviation.