Journal: The Journal of Cell Biology

Article Title: Small GTPase ActIvitY ANalyzing (SAIYAN) system: A method to detect GTPase activation in living cells

doi: 10.1083/jcb.202403179

Figure Lengend Snippet: Sar1 membrane association is efficiently detected using the Split mNeonGreen system. (A) Schematic representation of the SAIYAN system. The membrane-spanning regions of TANGO1S and HA-tag fused to 10 of the 11 strands of mNG (mNG 1–10 ) were expressed in cells. In addition, Sar1A constructs with a FLAG-tag and a glycine linker fused to the 11th strand of mNG (mNG 11 ) were also expressed. Upon Sar1A activation, mNG 1–10 and mNG 11 combined to form the complete mNG proteins, inducing mNG signals. (B) HA-mNG 1–10 cells transfected with the indicated Sar1A constructs were fixed and stained with anti-Sec16-C and anti-FLAG antibodies. Scale bar = 10 µm. (C) Quantification of mNG intensity from B (arbitrary units [A.U.]). Error bars represent the means ± SEM. Each data point represents the mNG intensity of the analyzed cells.

Article Snippet: Sar1A/SAIYAN (HeLa) cells on a 3.5-cm glass bottom dish (Matsunami) treated with or without doxycycline were transfected with Str-KDEL_ManII-SBP-mCherry (Addgene).

Techniques: Membrane, Construct, FLAG-tag, Activation Assay, Transfection, Staining

Journal: The Journal of Cell Biology

Article Title: Small GTPase ActIvitY ANalyzing (SAIYAN) system: A method to detect GTPase activation in living cells

doi: 10.1083/jcb.202403179

Figure Lengend Snippet: Validation of SAIYAN technology. (A) Doxycycline-inducible HeLa cells expressing the membrane-spanning region of TANGO1S and HA-tag fused to 10 of the 11 strands of mNG (HA-mNG 1–10 cells) were either non-transfected or transfected with Sar1A constructs with a FLAG tag and a glycine linker fused to the 11th strand of mNG (Sar1A-FLAG-mNG 11 ). The cells were fixed and stained with anti-HA and anti-PDI antibodies. Scale bar = 10 µm. (B) HA-mNG 1–10 cells, treated with or without doxycycline, were transfected with Sar1A-FLAG-mNG 11 . The cells were fixed and stained with anti-HA and anti-FLAG antibodies. Scale bar = 10 µm.

Article Snippet: Sar1A/SAIYAN (HeLa) cells on a 3.5-cm glass bottom dish (Matsunami) treated with or without doxycycline were transfected with Str-KDEL_ManII-SBP-mCherry (Addgene).

Techniques: Expressing, Membrane, Transfection, Construct, FLAG-tag, Staining

Journal: The Journal of Cell Biology

Article Title: Small GTPase ActIvitY ANalyzing (SAIYAN) system: A method to detect GTPase activation in living cells

doi: 10.1083/jcb.202403179

Figure Lengend Snippet: Production of Sar1A/SAIYAN cells. (A) Doxycycline-inducible stable cell lines expressing the membrane-spanning regions of TANGO1S and HA-tag fused to 10 of the 11 strands of mNG were established using a lentiviral system and G418 selection (HA-mNG 1–10 cells). Stable cells were subsequently electroporated with Cas9 protein, sgRNA, and ssDNA to facilitate the knock-in of FLAG-mNG 11 into the Sar1A locus of the genome. Cells were treated with doxycycline for 24 h and further sorted via FACS to isolate single cells exhibiting mNG signals into 96-well plates. The expanded cell population was then collected and subjected to genomic sequencing. Positive clones were identified and selected for further analysis (Sar1A/SAIYAN cells). (B) Sar1A/SAIYAN (HeLa) cells, either treated or non-treated with doxycycline, were fixed and stained with anti-HA and anti-PDI antibodies. Boxed areas in the middle panels are shown at high magnification in the bottom panels. Scale bars: 10 µm (main), 5 µm (magnification). (C) Sar1A/SAIYAN (HeLa) cells, either treated or non-treated with doxycycline, were fixed and stained with anti-HA and anti-FLAG antibodies. Boxed areas in the middle panels are shown at high magnification in the bottom panels. Scale bar:10 µm (main), 5 μm (magnification). (D) Sar1A/SAIYAN (HeLa) cells transfected with the indicated siRNAs were fixed and stained with an anti-Sec16-C antibody. Scale bar = 10 µm. (E) Quantification of mNG intensity from D (arbitrary units [A.U.]). Error bars represent the means ± SEM. Each data point represents the mNG intensity of the analyzed cells. (F) Sar1A/SAIYAN (HeLa) cells transfected with the indicated siRNAs were lysed and subjected to SDS-PAGE, followed by western blotting with anti-FLAG, anti-HA, anti-Sar1A, and anti-GAPDH antibodies. (G) Sar1A/SAIYAN (HeLa) cells, either treated or non-treated with doxycycline, were fractionated via centrifugation. The lysates, the supernatants, and the pellets were subjected to SDS-PAGE, followed by western blotting with anti-FLAG, Sar1A, HA, ERK1, and calnexin antibodies. Source data are available for this figure: .

Article Snippet: Sar1A/SAIYAN (HeLa) cells on a 3.5-cm glass bottom dish (Matsunami) treated with or without doxycycline were transfected with Str-KDEL_ManII-SBP-mCherry (Addgene).

Techniques: Stable Transfection, Expressing, Membrane, Selection, Knock-In, Genomic Sequencing, Clone Assay, Staining, Transfection, SDS Page, Western Blot, Centrifugation

Journal: The Journal of Cell Biology

Article Title: Small GTPase ActIvitY ANalyzing (SAIYAN) system: A method to detect GTPase activation in living cells

doi: 10.1083/jcb.202403179

Figure Lengend Snippet: Sar1A/SAIYAN (HeLa) cells proliferate and secrete normally. (A) HeLa and Sar1A/SAIYAN (HeLa) cells were treated with or without doxycycline for 24 h, and cell viability was measured and normalized using untreated HeLa cells as control. Error bars represent the means ± SEM. n = 4. (B) Sar1A/SAIYAN (HeLa) cells, treated with or without doxycycline, were fixed and stained with anti-Sec16-C and anti-GM130 antibodies. Scale bars = 10 µm. (C) Sar1A/SAIYAN (HeLa) cells treated with or without doxycycline were transfected with Str-KDEL_ManII-SBP-mCherry. RUSH chase was started with biotin addition, and live imaging was performed. Scale bars = 10 μm.

Article Snippet: Sar1A/SAIYAN (HeLa) cells on a 3.5-cm glass bottom dish (Matsunami) treated with or without doxycycline were transfected with Str-KDEL_ManII-SBP-mCherry (Addgene).

Techniques: Control, Staining, Transfection, Imaging

Journal: The Journal of Cell Biology

Article Title: Small GTPase ActIvitY ANalyzing (SAIYAN) system: A method to detect GTPase activation in living cells

doi: 10.1083/jcb.202403179

Figure Lengend Snippet: ER exit site organization is required for the efficient activation of Sar1A. (A, C, E, and G) Sar1A/SAIYAN (HeLa) cells transfected with the indicated siRNAs were fixed and stained with anti-Sec16-C antibodies. Scale bar = 10 µm. (B, D, F, and H) Quantification of mNG signals from A, C, E, and G, respectively (arbitrary units [A.U.]). Error bars represent the means ± SEM. Each data point represents the mNG intensity of the analyzed cells.

Article Snippet: Sar1A/SAIYAN (HeLa) cells on a 3.5-cm glass bottom dish (Matsunami) treated with or without doxycycline were transfected with Str-KDEL_ManII-SBP-mCherry (Addgene).

Techniques: Activation Assay, Transfection, Staining

Journal: The Journal of Cell Biology

Article Title: Small GTPase ActIvitY ANalyzing (SAIYAN) system: A method to detect GTPase activation in living cells

doi: 10.1083/jcb.202403179

Figure Lengend Snippet: Western blotting analysis of Sar1A/SAIYAN (HeLa) cells on , , and . (A) Sar1A/SAIYAN (HeLa) cells transfected with the indicated siRNAs were lysed and subjected to SDS-PAGE, followed by western blotting with anti-FLAG, anti-HA, anti-Sec12, and anti-GAPDH antibodies. (B) Sar1A/SAIYAN (HeLa) cells transfected with the indicated siRNAs were lysed and subjected to SDS-PAGE, followed by western blotting with anti-FLAG, anti-HA, anti-cTAGE5 CC1, anti-Sec12, and anti-GAPDH antibodies. (C) Sar1A/SAIYAN (HeLa) cells transfected with the indicated siRNAs were lysed and subjected to SDS-PAGE, followed by western blotting with anti-FLAG, anti-HA, anti-TANGO1 CC1, and anti-GAPDH antibodies. (D) Sar1A/SAIYAN (HeLa) cells transfected with the indicated siRNAs were lysed and subjected to SDS-PAGE, followed by western blotting with anti-FLAG, anti-HA, anti-Sec16-N, and anti-GAPDH antibodies. (E) Sar1A/SAIYAN (HeLa) cells transfected with the indicated siRNAs were lysed and subjected to SDS-PAGE, followed by western blotting with anti-FLAG, anti-HA, anti-Sec23A (11D8), and anti-GAPDH antibodies. (F) Sar1A/SAIYAN (HeLa) cells transfected with the indicated siRNAs were lysed and subjected to SDS-PAGE, followed by western blotting with anti-FLAG, anti-HA, anti-Sec31A (rabbit), and anti-GAPDH antibodies. (G) Sar1A/SAIYAN (HeLa) cells were stably expressed using mCherry-tagged Sec23A constructs as indicated. Cells were lysed and subjected to SDS-PAGE, followed by western blotting with anti-FLAG, anti-HA, anti-Sec23A (11D8), anti-Sec31A (rabbit), and anti-GAPDH antibodies. Source data are available for this figure: .

Article Snippet: Sar1A/SAIYAN (HeLa) cells on a 3.5-cm glass bottom dish (Matsunami) treated with or without doxycycline were transfected with Str-KDEL_ManII-SBP-mCherry (Addgene).

Techniques: Western Blot, Transfection, SDS Page, Stable Transfection, Construct

Journal: The Journal of Cell Biology

Article Title: Small GTPase ActIvitY ANalyzing (SAIYAN) system: A method to detect GTPase activation in living cells

doi: 10.1083/jcb.202403179

Figure Lengend Snippet: Sec23A and Sec31A depletion exerts opposite effects on the activation of Sar1A in living cells. (A and C) Sar1A/SAIYAN (HeLa) cells transfected with the indicated siRNAs were fixed and stained with anti-Sec16-C antibodies. Scale bar = 10 µm. (B and D) Quantification of mNG signals from A and C, respectively (arbitrary units [A.U.]). Error bars represent the means ± SEM. Each data point represents the mNG intensity of the analyzed cells. (E) Sar1A/SAIYAN (HeLa) cells transfected with the indicated plasmids were fixed and processed for microscopic analysis. Scale bar = 10 µm. (F) Quantification of mNG signals from E (A.U.). Error bars represent the means ± SEM. Each data point represents the mNG intensity of the analyzed cells.

Article Snippet: Sar1A/SAIYAN (HeLa) cells on a 3.5-cm glass bottom dish (Matsunami) treated with or without doxycycline were transfected with Str-KDEL_ManII-SBP-mCherry (Addgene).

Techniques: Activation Assay, Transfection, Staining

Journal: The Journal of Cell Biology

Article Title: Small GTPase ActIvitY ANalyzing (SAIYAN) system: A method to detect GTPase activation in living cells

doi: 10.1083/jcb.202403179

Figure Lengend Snippet: Each CLSD mutant of Sec23A exhibits different properties on Sar1 activation. (A) Sar1A/SAIYAN (HeLa) cells stably expressing mCherry-tagged Sec23A constructs, as indicated, were fixed and processed for microscopic analysis. Scale bar = 10 µm. (B) Quantification of mNG signals from A (A.U.). Error bars represent the means ± SEM. Each data point represents the mNG intensity of the analyzed cells.

Article Snippet: Sar1A/SAIYAN (HeLa) cells on a 3.5-cm glass bottom dish (Matsunami) treated with or without doxycycline were transfected with Str-KDEL_ManII-SBP-mCherry (Addgene).

Techniques: Mutagenesis, Activation Assay, Stable Transfection, Expressing, Construct

Journal: The Journal of Cell Biology

Article Title: Small GTPase ActIvitY ANalyzing (SAIYAN) system: A method to detect GTPase activation in living cells

doi: 10.1083/jcb.202403179

Figure Lengend Snippet: DPD treatment accumulates collagen I within the ER of Sar1A/SAIYAN (BJ-5ta) cells. Sar1A/SAIYAN (BJ-5ta) cells were treated with DMSO or 0.5 mM DPD and incubated for 16 h. Cells were fixed and stained with an anti-collagen I antibody. Scale bar = 10 µm.

Article Snippet: Sar1A/SAIYAN (HeLa) cells on a 3.5-cm glass bottom dish (Matsunami) treated with or without doxycycline were transfected with Str-KDEL_ManII-SBP-mCherry (Addgene).

Techniques: Incubation, Staining

Journal: The Journal of Cell Biology

Article Title: Small GTPase ActIvitY ANalyzing (SAIYAN) system: A method to detect GTPase activation in living cells

doi: 10.1083/jcb.202403179

Figure Lengend Snippet: Activated Sar1 prevails in the ERGIC region of Sar1A/SAIYAN (BJ-5ta) cells. (A–O) Sar1A/SAIYAN (BJ-5ta) cells were fixed and stained with anti-Sec16-C (A), anti-ERGIC53 (B), anti-Sec23 (5H2) (C), anti-Sec24B (D), anti-Sec24D (E), anti-p125A (F), anti-TANGO1-CT (G), anti-Sec12 (H), anti-TFG (I), anti-Sec13 (J), anti-Sec31A (mouse) (K), anti-β-COP (L), anti-GM130 (M), anti-PDI (N), and anti-Rab1A (O) antibodies. Images were captured using Airyscan2. Scale bars: 10 µm (main), 1 µm (magnification). (A–L) Right; top: Magnification of the indicated regions is on the left. Right; bottom: Magnification of the indicated regions on the upper. (P) Pearson’s correlation coefficient was used to quantify the degree of colocalization. n = 5. Cyan; outer COPII coats, blue; inner COPII coats, purple; ER exit site resident proteins, red; ERGIC proteins, orange; COPI protein, magenta; ER and Golgi proteins. Error bars represent the mean 95% CI.

Article Snippet: Sar1A/SAIYAN (HeLa) cells on a 3.5-cm glass bottom dish (Matsunami) treated with or without doxycycline were transfected with Str-KDEL_ManII-SBP-mCherry (Addgene).

Techniques: Staining

Journal: The Journal of Cell Biology

Article Title: Small GTPase ActIvitY ANalyzing (SAIYAN) system: A method to detect GTPase activation in living cells

doi: 10.1083/jcb.202403179

Figure Lengend Snippet: Triple staining of Sar1A/SAIYAN (BJ-5ta) and parental BJ-5ta reveals the organization of the ER-Golgi interface of collagen-secreting cells. (A–C) Sar1A/SAIYAN (BJ-5ta) cells were fixed and stained with anti-Sec16-C and anti-ERGIC53 (A), anti-Sec23 (5H2), and anti-ERGIC53 (B), and anti-Rab1A and anti-ERGIC53 (C) antibodies. Images were captured using the Airyscan2. Scale bars: 10 µm (main), 1 µm (magnification). (D) BJ-5ta cells were fixed and stained with anti-Sec16-C, anti-Sec23 (5H2), and anti-ERGIC53 antibodies. Images were captured using the Airyscan2. Scale bars: 10 µm (main), 1 µm (magnification). (A–D) (right; top) Magnification of the indicated regions is on the left. (right; bottom) Double staining of the magnified region on the top.

Article Snippet: Sar1A/SAIYAN (HeLa) cells on a 3.5-cm glass bottom dish (Matsunami) treated with or without doxycycline were transfected with Str-KDEL_ManII-SBP-mCherry (Addgene).

Techniques: Staining, Double Staining

Journal: The Journal of Cell Biology

Article Title: Small GTPase ActIvitY ANalyzing (SAIYAN) system: A method to detect GTPase activation in living cells

doi: 10.1083/jcb.202403179

Figure Lengend Snippet: Quantification of Pearson’s correlation coefficient to quantify the degree of colocalization in Sar1A/SAIYAN (HeLa) cells. Sar1A/SAIYAN (HeLa) cells were fixed and stained with anti-Sec16-C, anti-ERGIC53, anti-Sec23, anti-Sec24B, anti-Sec24D, anti-p125A, anti-TANGO1-CT, anti-Sec12, anti-TFG, anti-Sec13, anti-Sec31A (mouse), anti-β-COP, anti-GM130, anti-PDI, and anti-Rab1A antibodies. Images were captured using the Airyscan2. n = 5. Cyan; outer COPII coats, blue; inner COPII coats, purple; endoplasmic reticulum (ER) exit site resident proteins, red; ERGIC proteins, orange; COPI protein, magenta; ER and Golgi proteins. Error bars represent the mean 95% CI.

Article Snippet: Sar1A/SAIYAN (HeLa) cells on a 3.5-cm glass bottom dish (Matsunami) treated with or without doxycycline were transfected with Str-KDEL_ManII-SBP-mCherry (Addgene).

Techniques: Staining

Journal: The Journal of Cell Biology

Article Title: Small GTPase ActIvitY ANalyzing (SAIYAN) system: A method to detect GTPase activation in living cells

doi: 10.1083/jcb.202403179

Figure Lengend Snippet: Reticular pattern of activated Sar1 signals diminished with DPD treatment in Sar1A/SAIYAN (BJ-5ta) cells. (A) Sar1A/SAIYAN (BJ-5ta) cells were treated with DMSO or 0.5 mM DPD and incubated for 16 h. Cells were fixed and stained with anti-Sec16-C antibodies. Images were captured using the Airyscan2. Scale bars: 10 µm (main), 1 µm (magnification). (B) Pearson’s correlation coefficient was quantified to assess the degree of colocalization. n = 5. Error bars represent the mean 95% CI.

Article Snippet: Sar1A/SAIYAN (HeLa) cells on a 3.5-cm glass bottom dish (Matsunami) treated with or without doxycycline were transfected with Str-KDEL_ManII-SBP-mCherry (Addgene).

Techniques: Incubation, Staining

Journal:

Article Title: Hepatitis C Virus Nonstructural 5A Protein Induces Interleukin-8, Leading to Partial Inhibition of the Interferon-Induced Antiviral Response

doi: 10.1128/JVI.75.13.6095-6106.2001

Figure Lengend Snippet: Effect of NS5A expression on IFN signal transduction. (A) Tetracycline (Tc)-regulated expression of full-length and mutant NS5A proteins. FL-NR denotes a full-length NS5A construct derived from an IFN-nonresponsive patient, while FL-CR denotes a full-length NS5A construct derived from an IFN-responsive patient. ΔN-110, ΔN-222, ΔN-334, ΔC-117, and ΔC-230 represent NS5A deletion mutants lacking 110, 222, 334, amino acids from the amino terminus and 117 and 230 amino acids from the carboxy terminus, respectively. Protein positions are shown by arrows. Western blots were probed with HCV-infected patient serum as described in Materials and Methods. (B) Effect of NS5A expression on ISGF-3 induction. Plasmids were transiently transfected into HeLa Tet-Off cells, grown in the absence and presence of tetracycline to induce and repress NS5A, respectively, and treated with IFN to induce ISGF-3. Protein extracts were hybridized to a 32P-labeled oligonucleotide corresponding to the consensus ISRE. “puc” represents a control transfection with the pTRE-puc parental plasmid with no insert. “E3L,” “PKR,” and “E1A” represent expression of the E3L, PKR, and E1A proteins, respectively. The p48 monoclonal antibody used to form supershifts (denoted by “ss” and an arrow) is denoted by “p48 Mab”. “n” and “c” represent nuclear and cytoplasmic extracts, respectively. ISGF-3 is induced only with IFN treatment and is indicated with arrows.

Article Snippet: Human HeLa Tet-Off cells were obtained from Clontech (Palo Alto, Calif.).

Techniques: Expressing, Transduction, Mutagenesis, Construct, Derivative Assay, Western Blot, Infection, Transfection, Labeling, Plasmid Preparation

Journal:

Article Title: Hepatitis C Virus Nonstructural 5A Protein Induces Interleukin-8, Leading to Partial Inhibition of the Interferon-Induced Antiviral Response

doi: 10.1128/JVI.75.13.6095-6106.2001

Figure Lengend Snippet: NS5A expression is associated with increased IL-8 protein production and inhibition of the antiviral effects of IFN. (A) Correlation among levels of IL-8 in culture supernatants, amounts of NS5A protein expression, and levels of EMCV rescue in the trans rescue assay. HeLa cells expressing FL-NS5A-NR were grown for 48 h in medium containing 0, 0.001, 0.01, and 1.0 μg of tetracycline per ml for 48 h, treated with 20 U of IFN per ml for 24 h, and infected with EMCV at an MOI of 0.01 for 24 h. The amount of IL-8 protein in culture supernatants, determined by ELISA, is indicated in the bar graph. Changes in EMCV titers were determined 24 h postinfection by viral plaque assay. The levels of NS5A protein expression were determined by Western blot analysis of equal amounts of total cellular protein extracts and are presented as +++, ++, +, and −, which correspond to high, intermediate, low, and undetectable levels of NS5A protein, respectively, as determined by computerized scanning of the chemiluminescent signal. Fold EMCV rescue represents the difference in EMCV titers in the presence of IFN among cells treated with 0, 0.001, and 0.01 μg of tetracycline per ml versus the 1.0-μg/ml concentration. (B) IL-8 inhibits the antiviral actions of IFN in vitro. HeLa Tet-Off cells were pretreated with or without 33 ng of recombinant human IL-8 per ml for 6 h and then with 20 U of IFN per ml for 18 h. Cells were then infected with EMCV at an MOI of 0.1 for 24 h. Supernatants were harvested, and the amount of EMCV was determined by titration on L929 cells. Error bars represent standard deviations, and P values derived from Student's t tests are indicated.

Article Snippet: Human HeLa Tet-Off cells were obtained from Clontech (Palo Alto, Calif.).

Techniques: Expressing, Inhibition, Rescue Assay, Infection, Enzyme-linked Immunosorbent Assay, Viral Plaque Assay, Western Blot, Concentration Assay, In Vitro, Recombinant, Titration, Derivative Assay

Journal:

Article Title: Hepatitis C Virus Nonstructural 5A Protein Induces Interleukin-8, Leading to Partial Inhibition of the Interferon-Induced Antiviral Response

doi: 10.1128/JVI.75.13.6095-6106.2001

Figure Lengend Snippet: NS5A transactivates the IL-8 promoter. (A) Effect of NS5A expression on luciferase expression under the control of the 546-luc IL-8 promoter. The 546-luc plasmid and pTRE-FL-NS5A-NR (10 μg each) were transfected into HeLa Tet-Off cells, and cells were split in triplicate and grown in media with or without tetracycline for 48 h. Cells were then treated or not treated with IFN for 24 h. The amount of luciferase activity in cell lysates was determined using a luminometer. (B) Effect of NS5A expression on luciferase activity under the control of truncated IL-8 promoters. Ten micrograms of the relevant reporter plasmid was transfected into HeLa FL-NS5A-NR cells, and cells were grown in media with or without tetracycline for 48 h. The amount of luciferase activity in cell lysates was determined using a luminometer. 546-luc, 133-luc, and 98-luc contain 546, 133, and 98 bases of the IL-8 promoter, respectively. Error bars represent standard deviations, and P values derived from Student's t tests are indicated.

Article Snippet: Human HeLa Tet-Off cells were obtained from Clontech (Palo Alto, Calif.).

Techniques: Expressing, Luciferase, Plasmid Preparation, Transfection, Activity Assay, Derivative Assay

Journal:

Article Title: Hepatitis C Virus Nonstructural 5A Protein Induces Interleukin-8, Leading to Partial Inhibition of the Interferon-Induced Antiviral Response

doi: 10.1128/JVI.75.13.6095-6106.2001

Figure Lengend Snippet: Characterization of domains on NS5A and the IL-8 promoter required for transactivation. (A) Effect of NS5A mutant proteins on luciferase expression under the control of the full-length (546-luc) IL-8 promoter. Ten-microgram quantities of the 546-luc plasmid and pTRE-FL-NS5A-NR, NS5A-ΔN110, NS5A-ΔN222, or NS5A-ΔC117 were transfected into HeLa Tet-Off cells, and cells were split in triplicate and grown in media with or without tetracycline for 48 h. The amount of luciferase activity in cell lysates was determined using a luminometer. The data shown are the fold changes in luciferase activity with the gene in the induced versus the uninduced state. (B) Im- munofluoresence analysis of HeLa cells expressing FL-NS5A-NR, NS5A-ΔN222, or NS5A-ΔC117. HeLa Tet-Off cells stably transfected with FL-NS5A-NR (top panels), NS5A-ΔN222 (middle panels), or NS5A-ΔC117 (lower panels) were grown in the absence or presence of tetracycline (Tc) to induce or repress NS5A expression for 48 h. Cells were fixed and stained with a monoclonal NS5A antibody and then with Cy3-linked anti-mouse secondary antibodies, as described in Materials and Methods. Images are at a ×100 amplification. (C) Effect of NS5A-ΔN222 expression on luciferase activity under the control of mutated IL-8 promoters. Ten-microgram quantities of NS5A-ΔN222 and the relevant reporter plasmid were cotransfected into HeLa Tet-Off cells; cells were split in triplicate and grown in media with or without tetracycline for 48 h. Cells were then treated with 4 ng of TNF-α for 6 h. The amount of luciferase activity in cell lysates was determined using a luminometer. 546-luc, 133-luc, and 98-luc contain 546, 133, and 98 bases of the IL-8 promoter, respectively. NF-κB–luc, AP-1–luc, and NF–IL-6–luc represent the 133-luc plasmid with point mutations in the NF-κB, AP-1, and NF–IL-6 binding sites.

Article Snippet: Human HeLa Tet-Off cells were obtained from Clontech (Palo Alto, Calif.).

Techniques: Mutagenesis, Luciferase, Expressing, Plasmid Preparation, Transfection, Activity Assay, Stable Transfection, Staining, Amplification, Binding Assay

Journal: Gels

Article Title: Enzyme Responsive Vaginal Microbicide Gels Containing Maraviroc and Tenofovir Microspheres Designed for Acid Phosphatase-Triggered Release for Pre-Exposure Prophylaxis of HIV-1: A Comparative Analysis of a Bigel and Thermosensitive Gel

doi: 10.3390/gels8010015

Figure Lengend Snippet: Cytotoxic effect of the varying concentrations of maraviroc and tenofovir microspheres, negative and positive control on the HeLa cell lines. Results are given as mean ± SD, n = 3.

Article Snippet: Cell lines: HeLa cells and fetal bovine serum were purchased from Cell Lines Service GmbH, Germany.

Techniques: Positive Control