Loss of Calreticulin Uncovers a Critical Role for Calcium in Regulating Cellular Lipid Homeostasis

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1 SUPPLEMENTARY MATERIAL Loss of Calreticulin Uncovers a Critical Role for Calcium in Regulating Cellular Lipid Homeostasis Wen-An Wang 1, Wen-Xin Liu 1, Serpen Durnaoglu 2, Sun-Kyung Lee 2, Jihong Lian 3, Richard Lehner 3, Joohong Ahnn 2, Luis B. Agellon 4 and Marek Michalak 1 From the 1 Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2H7; 2 Department of Life Sciences, Research Institute for Natural Sciences, BK21 Plus Life Science for BDR Team, Research Institute of Natural Science, Hanyang University, Seoul , South Korea; 3 Department of Cell Biology, University of Alberta, Edmonton, Alberta, T6G 2H7, Canada and 4 School of Dietetics and Human Nutrition, McGill University, Ste. Anne de Bellevue, Quebec, H9X 3V9, Canada 1

2 wt Calr-/- + CaN Supplementary Figure S1. Serum from wild-type (wt) and calreticulin-deficient (Calr -/- ) mouse rescued by cardiac-specific expression of the activated calcineurin (Calr -/- +CaN) 12. 2

3 wild-type Calr -/- 0 min 10 min 15 min 30 min 60 min Supplementary Figure S2. Uptake of fluorescent LDL in wild-type and Calr -/- cells. The time of incubation with LDL fluorescent complex with BODIPY as indicate in the Figure. 3

4 Relative Rate of Cholesterol Synthesis Calr -/- normal media serum-free media Supplementary Figure S3. Rate of cholesterol synthesis in Calr -/- cells cultured with normal and serum-free media. 4

5 nsrebp Activity (fold induction) S1P sirna Supplementary Figure S4. Wild-type and Calr -/- cells were transfected with sirna specific for S1P followed by nsrebp activity assay. 5

6 nsrebp Activity (fold induction) A Ca 2+ replete 500 M wild-type Calr -/- * 300 M 150 M 100 M Calcium depletion Ca 2+ replete B Control Lipid-free wild-type 150 M Ca 2+ anti-calr anti-srebp-1 anti-nsrebp-1 anti-srebp-2 anti-nsrebp-2 anti- -tubulin Normalized nsrebp-1/total SREBP-1 Ratio C Control * * Lipid-free 150 M Ca 2+ Normalized nsrebp-2/total SREBP-2 Ratio D Control ** ** Lipid-free 150 M Ca 2+ Supplementary Figure S5. Ca 2+ effects on SREBP processing in Calr -/- cells. A. nsrebp activity in Calr -/- cells exposed to decreasing extracellular Ca 2+ concentration as indicated in the Figure. Ca 2+ replete represents 2.17 mm extracellular Ca 2+ concentration. *Indicates statistically significant differences, wildtype vs. Calr -/- cells in control conditions p-value= Representative of 7 biological replicates. B. Representative immunoblot analysis of SREBP-1, nsrebp-1, SREBP-2 and nsrebp-2 protein in wildtype cells grown in cholesterol-free media or treated with 150 µm extracellular Ca 2+. Anti- -tubulin antibodies were used as a loading control. Representative of 3 biological replicates. C, D. Quantitative analysis of Immunoblots, ratio of nuclear to total SREBP-1 (C) and total SREBP-2 (D). *Indicates statistically significant differences, in C, for SREBP-1, control vs. cholesterol-free p-value= and control vs. 150 µm Ca 2+, p-value= **Indicates statistically significant differences, in D, for SREBP- 2, control vs. cholesterol free, p-value=0.0012; control vs. 150 µm Ca 2+, p-value= Representative of 3 biological replicates. The images of (B) shown are cropped. The full-length gel/blots are shown in Fig. S17. 6

7 A SREBP ER-RFP Merge B SREBP ER-RFP Merge Supplementary Figure S6. Cellular distribution of SREBP-2 in wild-type and Calr -/- cells. Wild-type cells (A) and Calr -/- cells (B) expressing ER-targeted red fluorescent protein (ER-RFP) were stained with anti-srebp antibodies. Wild-type cells Pearson s coefficient=0.231±0.035 (n=15); Calr -/- cells Pearson s coefficient=0.291±0.038 (n=15). Graphic representation of overlap SREBP and ER-RFP signals from representative cells is presented in the Figure. The arrows indicate the direction of the scan represented in the graph. 7

8 N.S. Control 2.5 N.S. Lipid-free media nsrebp Activity (fold induction) * * N.S. N.S. Lipid-free media + Cholesterol (0.25 g/ml) 0 SRE mutsre Supplementary Figure S7. Mutational analysis of the SRE element in HeLa cells. nsrebp activity in HeLa cells transfected with the SRE luciferase reporter plasmid or the mutated SRE (mutsre) luciferase reporter plasmid treated with normal media, lipid-free media and lipid-free media plus cholesterol (0.25 µg/ml). SRE nucleotide sequence was mutated from ATCACCCCAC to ATTACCACGC. *Indicates statistically significant differences: HeLa cells with the SRE luciferase reporter in normal vs. lipid-free media, p-value<0.05 (ANOVA); HeLa cells with the SRE luciferase reporter in lipid-free media vs. lipidfree media plus cholesterol (0.25 µg/ml), p-value<0.05 (ANOVA). NS, not significant. Representative of 3 trials with 3 replicates. 8

9 Anti-Calr Anti-SREBP-1 wild-type Ca lr -/- *SREBP-1 *nsrebp-1 *Calr Anti-SREBP-2 Anti- -tubulin *SREBP-2 *nsrebp-2 * -tubulin Figure S8. The full-length blots for Figure 2B 9

10 Anti-Calr wildtype Calr -/- Calr -/- + rcalr *Calr Figure S9. The full-length blots for Figure 2F 10

11 Anti-Calr Anti-SCAP wild-type Calr-/- *SCAP *Calr Anti-INSIG Anti- -tubulin *INSIG * -tubulin Figure S10. The full-length blots for Figure 3B 11

12 Anti-INSIG Input Preclear IgG IP: SCAP Input Preclear IgG IP: SCAP *INSIG Figure S11. The full-length blot for Figure 3C 12

13 Anti-SCAP Input Preclear IgG IP: SCAP Input Preclear IgG IP: SCAP *SCAP Input wild-type Calr -/- *SCAP Figure S12. The full-length blots for Figure 3D 13

14 Anti-SREBP-2 Cycloheximide min Cycloheximide min *nsrebp-2 *nsrebp-2 Anti- -tubulin Cycloheximide min Cycloheximide min * -tubulin Figure S13. The full-length blots for Figure 3F 14

15 Anti-ATF6 Control TUN Control TUN Anti-Calr Control TUN Control TUN *ATF6 *Calr *natf6 Anti- -tubulin Control TUN Control TUN * -tubulin Figure S14. The full-length blots for Figure 4A 15

16 Anti-Calnexin wild-type Total Fraction number *Calnexin Anti-GAPDH wild-type Total Fraction number *GAPDH Figure S15. The full-length blots for Figure 7A 16

17 Anti-Calnexin Calr -/- Total Fraction number *Calnexin Anti-GAPDH Calr -/- Total Fraction number *GAPDH Figure S16. The full-length blots for Figure 7A 17

18 Anti-Calr Control Lipid-free 150 M Ca 2+ Anti-SREBP-1 Control Lipid-free 150 M Ca 2+ *SREBP-2 *Calr *nsrebp-2 Anti-SREBP-2 Control Lipid-free 150 M Ca 2+ Anti- -tubulin Control Lipid-free 150 M Ca 2+ *SREBP-2 *nsrebp-2 * -tubulin Figure S17. The full-length blots for Figure S5B 18

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