Fig. 5. Ubiquitination, but not the lysosome pathway, is involved in the regulation of NKCC1 by ALD. To exclude the possibility that depletion of free.

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Fig. 5. Ubiquitination, but not the lysosome pathway, is involved in the regulation of NKCC1 by ALD. To exclude the possibility that depletion of free ubiquitin by the prolonged MG-132 treatment triggered nonspecific inhibition of lysosome degradation of NKCC1 and investigate whether ALD is involved in a lysosome pathway, a parallel experiment with chloroquine (CQ) was performed. Here, the positive marks (+) indicate application of ALD (1 μM), MG132 (20 μM), CQ (50 μM), ALD + CQ, and MG132 + CQ for 9 h. An autophagosome marker, autophagy-related gene 8 named as light chain 3 (LC3), and the lysosome-associated membrane protein 2 (LAMP-2) were used as indicators of lysosome pathway activation (phagocytic activity) under treatment with CQ. Activation of lysosome pathway proteins is indicated as the increased expression of lysosome markers, LC3-I, -II, and LAMP-2 vs. controls (1st bar). ALD and MG-132 treatments achieved some induction of NKCC1 protein expression [1st bar (Control) vs. 2nd and 3rd bars] without increasing lysosome pathway markers (rows 2 and 3). The induction of NKCC1 protein expression reached higher levels when ALD (1 μM) was combined with CQ (50 μM) treatment (4th bar). The effects of combined treatment with MG-132 (20 μM) and CQ, (5th bar) on the induction of NKCC1 equal the effects of ALD and CQ together (4th bar) but exceed those of ALD, CQ, or MG132 alone (2nd, 3rd, and 6 bars). Note that only when the lysosome pathway blocker CQ was used was their significant upregulation of LC3II and LAMP-2 expression levels. These data suggest that ALD specifically suppresses the proteasomal degradation of NKCC1 without affecting its degradation via the lysosomal pathway. Bottom: mean data ± SD bars; ****P < 0.0001, indicates the significance of control vs. 4th, 5th, and 6th bars; *P < 0.05, indicates the significance of control vs. the ALD and MG132 conditions alone. DOI: (10.1152/ajpcell.00096.2013)