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7 protocols using gaspak ez anaerobic pouch

1

Live Imaging of Halo-Tagged Delta-Giardin

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Cells were chilled with ice for 15 minutes to detach from the culture tube and then placed into an Attofluor cell chamber (Molecular Probes) and incubated in a GasPak EZ anaerobic pouch (BD) or a Tri-gas incubator (Panasonic) set to 2.5% O2, 5% CO2 for 90 minutes at 37°C. For live imaging of Halo-tagged Delta-Giardin JaneliaFluor 646 HaloTag ligand (Promega, GA1120) or JaneliaFluor 549 HaloTag ligand (Promega, GA1110) were added to Attofluor cell chambers in growth media at a ratio of 1:1000 during the initial re-attachment step. Cells were then washed four times with HEPES-buffered saline (HBS: 137mM NaCl, 5mM KCl, 0.91mM Na2HpO4-heptahydrate, 5.55mM Glucose, 20mM HEPES, pH7). Live cell imaging was performed on a DeltaVision Elite microscope (GE) equipped with DIC optics, using a 100 × 1.4 NA or 60 × 1.42 NA objective, and a sCMOS 5.4 PCle air-cooled camera (PCO-TECH) and an Oko lab Bold Line stage-top, incubator, set to 37°C, 2.5% O2, and 5% CO2.
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2

Imaging Live Cells under Hypoxia

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Cells were chilled with ice for 15 min to detach them from the culture tube and then placed into an Attofluor cell chamber (Molecular Probes) and incubated in a GasPak EZ anaerobic pouch (BD) or a Tri-gas incubator (Panasonic) set to 2.5% O2, 5% CO2 for 90 min at 37°C. Cells were then washed four times with HEPES-buffered saline (137 mM NaCl, 5 mM KCl, 0.91 mM Na2HPO4-heptahydrate, 5.55 mM glucose, 20 mM HEPES, pH 7), overlaid with a mixture of 0.7% ultralow gelling agarose (Sigma A2576) melted in HEPES-buffered saline, cooled for 10 min at room temperature to solidify, and then imaged. Live cell imaging was performed on a DeltaVision Elite microscope (GE) equipped with differential interference contrast (DIC) optics, using a 100× 1.4 numerical aperture (NA) or 60× 1.42 NA lens objective and a scientific complementary metal oxide semiconductor (sCMOS) 5.4 PCle air-cooled camera (PCO-TECH).
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3

Imaging Live Cells under Hypoxia

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Cells were chilled with ice for 15 min to detach them from the culture tube and then placed into an Attofluor cell chamber (Molecular Probes) and incubated in a GasPak EZ anaerobic pouch (BD) or a Tri-gas incubator (Panasonic) set to 2.5% O2, 5% CO2 for 90 min at 37°C. Cells were then washed four times with HEPES-buffered saline (137 mM NaCl, 5 mM KCl, 0.91 mM Na2HPO4-heptahydrate, 5.55 mM glucose, 20 mM HEPES, pH 7), overlaid with a mixture of 0.7% ultralow gelling agarose (Sigma A2576) melted in HEPES-buffered saline, cooled for 10 min at room temperature to solidify, and then imaged. Live cell imaging was performed on a DeltaVision Elite microscope (GE) equipped with differential interference contrast (DIC) optics, using a 100× 1.4 numerical aperture (NA) or 60× 1.42 NA lens objective and a scientific complementary metal oxide semiconductor (sCMOS) 5.4 PCle air-cooled camera (PCO-TECH).
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4

Live Cell Imaging of Chilled Cells

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Cells were chilled with ice for 15 minutes to detach from the culture tube and then placed into an Attofluor cell chamber (Molecular Probes) and incubated in a GasPak EZ anaerobic pouch (BD) or a Tri-gas incubator (Panasonic) set to 2.5% O2, 5% CO2 for 90 minutes at 37°C. Cells were then washed four times with HEPES-buffered saline (HBS: 137mM NaCl, 5mM KCl, 0.91mM Na2HpO4-heptahydrate, 5.55mM Glucose, 20mM HEPES, pH7). Live cell imaging was performed on a DeltaVision Elite microscope (GE) equipped with DIC optics, using a 100 × 1.4 NA or 60 × 1.42 NA objective, and a sCMOS 5.4 PCle air-cooled camera (PCO-TECH).
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5

Live-cell Imaging of Anaerobic Cells

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Cells were chilled with ice for 15 minutes to detach from the culture tube and then placed into an Attofluor cell chamber (Molecular Probes) and incubated in a GasPak EZ anaerobic pouch (BD) or a Tri-gas incubator (Panasonic) set to 2.5% O2, 5% Co2 for 90 minutes at 37° C. Cells were then washed four times with HEPES-buffered saline (137mM NaCl, 5mM KCl, 0.91mM Na2HpO4-heptahydrate, 5. 55mM Glucose, 20mM HEPES, and pH7), overlaid with a mixture of 0.7% ultra-low gelling agarose (Sigma A2576) melted in HEPES-buffered saline, cooled for 10 minutes at room temperature to solidify, then imaged. Live cell imaging was performed on a DeltaVision Elite microscope (GE) equipped with DIC optics, using a 100X 1.4 NA or 60X 1.42 NA objective, and a sCMOS 5.4 PCle air-cooled camera (PCO-TECH).
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6

Fetal Microbiome Sampling Protocol

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Within 3 h of fetal delivery, ESwab samples for bacterial culture were processed in a biological safety cabinet by study personnel wearing a sterile surgical gown, mask, full hood, and powder-free exam gloves. Specifically, ESwab buffer solutions were added to SP4 broth with urea (Hardy Diagnostics, Santa Maria, CA) and were plated on blood agar (Trypticase soy agar with 5% sheep blood) and chocolate agar. Samples of the chorionic plate (amnion-chorion interface and the subchorion), villous tree, and fetal distal colon were inoculated on each culture medium. ESwab samples of the fetal proximal colon were inoculated on blood and chocolate agar but not SP4 broth. Blood and chocolate agar plates were incubated under aerobic (5% CO2) and anaerobic (BD GasPak EZ anaerobic pouch) atmospheres at 37°C for 7 days. SP4 broth was only incubated under aerobic conditions. Negative and positive (blood and chocolate agar inoculated with a human buccal ESwab) culture medium controls were incubated alongside the rhesus macaque samples for 7 days.
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7

Hypoxia Response and Sirtuin Modulators

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HK2 cells purchased from American Type Culture Collection (Manassas, VA, USA) were cultured at 37°C in a 5% carbon dioxide (CO2) atmosphere in DMEM (Life Technologies, Carlsbad, NY, USA) mixed 1:1 (vol:vol) with F12 medium (Life Technologies) supplemented with 10% FBS (Life Technologies). Near confluent cells were incubated with serum‐free media for 24 hr to arrest and synchronize cell cycle. For hypoxic stimuli, cells were incubated in a hypoxic chamber using BD GAS‐PAK EZ anaerobic pouch (BD, Sparks, MD, USA) with 5% CO2/1% O2 and 94% N2 (v/v). For some experiments, cells were pretreated or treated with resveratrol (10 µM; Sigma‐Aldrich, St Louis, MO, USA) or sirtinol (10 µM; Sigma‐Aldrich) for the specified duration.
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