Supplementary Figure 1 Abu Jawdeh et al. Quantitation of cNHE1 binding by densitometry, as determined by anti-6xHis antibody detection. Data are normalized.

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Supplementary Figure 1 Abu Jawdeh et al. Quantitation of cNHE1 binding by densitometry, as determined by anti-6xHis antibody detection. Data are normalized to PI(4,5)P2 (defined as 1.0 in each experiment), and expressed as mean ± SEM.

Supplementary Figure 2 Abu Jawdeh et al. A representative autoradiograph of labeled lipids from LLC-PK1 cells treated with nigericin (10 µM) for either 5 or 15 minutes in varying pH conditions (pH 6.5, 7.0 or 7.5), and resolved on TLC plates. Abbreviations: +VE, positive control wherein PIP2 is used as a substrate in a lipid kinase assay with SF-9 purified PI-3 kinase-  enzyme; PIP2, phosphatidylinositol-4,5,-bis-phosphate; PIP3, phosphatidylinositol-3,4,5,-tri-phosphate.

Supplementary Figure 2, continued Abu Jawdeh et al. LLC-PK1 cells were treated with Nigericin (10 µM) for either 5 or 15 minutes in varying pH conditions (pH 6.5, 7.0 or 7.5), and resolved on TLC plates. Phosphoinositides from all experiments were quantitated by liquid scintillation counting (left panels) and densitometry (right panels). Bottom panels represent ratios of PI(3,4,5)P3:PI(4,5)P2 counts. Data are expressed as mean ± SEM.

Supplementary Figure 3 Abu Jawdeh et al. X-Y PlaneX-Z Plane PI(4,5)P2 A PI(3,4,5)P3 B PI(4,5)P2 PI(3,4,5)P3 D E G PI(4,5)P2 H NHE1 C F I Merge LLC-PK1 cells were cultured on permeable supports, transiently transfected with PLC  -PH (A,D) or Akt-PH (B,E) vectors, and then incubated with chemically modified, hydrolysis-resistant C8-PI(4,5)P2 (A,D) or C8-PI(3,4,5)P3 (B,E) in the upper and lower chambers, respectively. NHE1 was detected with anti-NHE1, followed by Texas red- conjugated anti-rabbit antibodies (C,F). In some panels (C,D), nuclei were counterstained with DAPI (Blue).

Supplementary Figure 4 Abu Jawdeh et al. LLC-PK1 cells were cultured to confluence on permeable supports to allow apical-basolateral polarity. NHE1-dependent [EIPA (1 µM)- inhibitable] Na + /H + exchange was measured in individual, BCECF-loaded LLC-PK1 cells by fluorescence microscopy following NH 4 Cl washout while simultaneously perfusing with Na-containing buffer over the apical and basolateral surfaces. Mean values ± SEM during the pH recovery phase, from three experiments, 8-10 cells per experiment, are shown.

Supplementary Figure 5 Abu Jawdeh et al. - GAPDH - Casp-3 Cisplatin PI(3,4,5)P3 PI(4,5)P GAPDH - Casp-3 Cisplatin PI(3,4,5)P3 PI(4,5)P BD AC Wild-type (A,B) and NHE1-null (Swe/Swe) (C,D) proximal tubule cell lines derived from C57BL/6 background mice were cultured on permeable supports, loaded with PI(4,5)P2 or PI(3,4,5)P3 vesicles, and then exposed to cisplatin (25 µM, 18 hr, 37 0 C). Dose-response experiments revealed no additional apoptosis at concentrations >25 µM (not shown). Apoptosis was determined by TUNEL assay (A, C) or detection of active caspase-3 by immunoblot analysis (B, D, upper panels). Blots were stripped and re-probed for GAPDH as a loading control (B, D, lower panels). * p<0.05 compared to cisplatin only by ANOVA. *