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4 protocols using mouse anti s6 ribosomal protein

1

Combining FUNCAT and Immunocytochemistry

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For experiments combining FUNCAT with immunocytochemistry, cells that had previously undergone the AHA-DBCO click chemistry protocol (described above) were washed and then blocked for 1 hour in 3% bovine serum albumin (BSA) in PBS, pH 7.4, at room temperature before being incubated with 1:200 rabbit anti-synaptophysin (080139; ThermoFisher) or 1:1000 mouse anti-S6 ribosomal protein (2317; Cell Signaling Technology) primary antibodies overnight at 4°C. Coverslips were then washed with PBS and incubated in 1:500 Cy3-conjugated rabbit anti-mouse (for synaptophysin; GE Healthcare, Buckinghamshire, UK) or goat anti-rabbit (for S6; GE Healthcare, Buckinghamshire, UK) secondary antibody for 1 hour at room temperature before being mounted on slides using ProLong Gold Antifade mountant. Image analysis is described in the next section.
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2

Mitochondrial Dynamics in Emphysema

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Human lung tissues from normal subjects and emphysema patients and mouse lung samples were homogenized in RIPA buffer with 1× Protease Inhibitor Cocktail and 1× PMSF. The lysates were centrifuged at full speed for 15 min at 4°C and analyzed by Western blotting as previously described (Lin et al., 2017 (link)). The primary antibodies used were rabbit anti-TFAM (1: 2000, Proteintech, Cat# 22586-1-AP), mouse anti-S6 ribosomal protein (1:2000, Cell Signaling Technology, Cat# 2317), rabbit anti-phospho-S6 ribosomal protein (Ser235/236) (1:2000, Cell Signaling Technology, Cat# 4856), mouse anti-OPA1 (clone 18) (1:2000, BD Transduction Laboratories, Cat# 612606), mouse anti-DLP1 (1:2000, BD Transduction Laboratories, Cat# 611113), rabbit anti-phospho-DRP1 (Ser616) (1:1000, Cell Signaling Technology, Cat# 3455S), and mouse anti-alpha-tubulin (1:3000, Developmental Studies Hybridoma Bank, Cat# 12G10).
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3

Quantification of Mitochondrial Proteins

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Purified lung epithelial cells were lysed in 2x Western blotting buffer (120 mM Tris-Cl pH 6.8, 4% SDS, 20% Glycerol, 200 mM DTT, 0.02% Bromophenol Blue). The lysates were centrifuged at 16,100 x g for 15 min at 4 °C before loading onto SDS-PAGE. The primary antibodies used were rabbit anti-Raptor (1:2000, EMD Millipore Corporation, Cat# 09-217; RRID:AB_1659713), mouse anti-S6 ribosomal protein (1:2000, Cell Signaling Technology, Cat# 2317; RRID:AB_2238583), rabbit anti-phospho-S6 ribosomal protein (Ser235/236) (1:2000, Cell Signaling Technology, Cat# 4856), rabbit anti-MLC2 (1:500; Cell Signaling Technology, Cat#3672; RRID:AB_10692513), goat anti-TFAM (1: 250, Santa Cruz Biotechnology, Cat# sc-23588; RRID:AB_2303230), rabbit anti-COX10 (1:500, Proteintech, Cat# 10611-2-AP; RRID:AB_2084833), mouse anti-MTCO1 (1:500, Abcam, Cat# ab14705; RRID:AB_2084810), and mouse anti-alpha-tubulin (1:3000, Developmental Studies Hybridoma Bank, Cat# 12G10; RRID:AB_1157911). Western blotting images were captured on a LI-COR Odyssey Fc device. The uncropped images are available in the Source Data file.
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4

Western Blot Analysis of Protein Expression

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Total protein extract was obtained from LHA using lysis buffer (50 mM Tris-HCl pH=7.5, 1 mM EGTA, 1 mM EDTA, 1% Triton-X100, 1 mM Sodium Orthovanadate, 50 mM Sodium Fluoride, 5 mM Sodium Pyrophosphate, 0.27 M sucrose). We charged 20 g of total protein in 8-10% SDS-PAGE acrylamide gels.
Proteins were transferred to Immuno-Blot PVDF membranes (BIORAD) with 0.2 or 0.45 g pore size. The membranes were subsequently blocked with 3-5% BSA in TBS 0.1% tween (TBS-T) for 1h. Membranes were incubated overnight with primary antibodies in blocking solution at 1:1000 dilution: goat anti-k-OR (Sigma SAB2501442), rabbit anti-phospho-ERK (Cell Signaling #4370), rabbit anti-p70S6Kinase (Cell Signaling #9202), rabbit anti-phospho-S6 ribosomal protein (Ser235/236) (Cell Signaling #2211), mouse anti-S6 ribosomal protein (Cell Signaling #2317) and mouse anti--Actin (Sigma A5316). Afterwards, membranes were washed three times 10 minutes with TBS-T, incubated 1h with secondary antibodies (DAKO) at 1:5000 dilutions, and again washed before protein detection using ECL chemiluminescent western blot substrate (Thermo Scientific). Images were quantified by ImageJ software.
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