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(A) Immunoblot analysis with anti-LC3 antibody shows that NO donors reduced LC3-II levels in rat primary cortical neurons and decreased autophagosome synthesis in bafilomycin A1-treated rat primary cortical neurons and HeLa cells.

(B-E) Confocal microscopy images and analysis of autophagic flux by automated Cellomics microscopy show that NO donors reduced autolysosome numbers in mRFP-GFP-LC3 HeLa cells grown in full medium (FM) (B and D) or starved with HBSS (C and E). Cells in HBSS had more autolysosomes compared to FM (C). Autolysosome number in untreated cells in FM is set at 100%.

(F) NO donors increased EGFP-HDQ74 aggregates in a dose-dependent manner in EGFP-HDQ74-transfected Atg5+/+, but not in Atg5−/−, MEFs. Atg5−/− MEFs had more EGFP-HDQ74 aggregates than Atg5+/+ MEFs.

(G and H) Confocal microscopy images (H) and immunofluorescence analysis with anti-Atg16 antibody (G) show that NO donors reduced the percentage of HeLa cells with Atg16-positive structures (arrows) under starvation. Graphical data denote mean ± SEM.

(A) NO donors reduced JNK1 phosphorylation in HeLa cells, as analyzed by immunoprecipitation with anti-JNK1 agarose-conjugated beads and immunoblotting with anti-phospho-JNK antibody.

(B) NO donors reduced Bcl-2 phosphorylation in HeLa cells, as analyzed by immunoblotting with anti-phospho-Bcl-2 antibody.

C) Immunoblot analysis with anti-phospho-Bcl-2 antibody shows that DETA NONOate could not reduce phospho-Bcl-2 in Flag-CA JNK1-transfected HeLa cells, where phospho-Bcl-2 was higher compared to mock-transfected cells.

(D and E) Immunoprecipitation with anti-Flag M2 affinity agarose gel and immunoblotting with anti-Myc antibody shows that NO donors increased the interaction of Flag-Beclin 1 with WT Myc-Bcl-2 (D), but not with AAA Myc-Bcl-2 (E), in HeLa cells transfected with WT Myc-Bcl-2 (D) or AAA Myc-Bcl-2 (E) along with either empty Flag or Flag-Beclin 1. Asterisk denotes IgG band (E).

(F) Immunoprecipitation with anti-Flag M2 affinity agarose gel and immunoblotting with anti-Vps34 antibody shows that NO donors decreased Flag-Beclin 1-hVps34 interaction in HeLa cells transfected with hVps34 along with either empty Flag or Flag-Beclin 1.

(G) Immunoprecipitation with anti-Flag M2 affinity agarose gel and immunoblotting with anti-Vps34 antibody shows that AAA Myc-Bcl-2 decreased Flag-Beclin 1-hVps34 interaction in the presence (right panel) or absence (left panel) of DETA NONOate in HeLa cells transfected with hVps34 along with either empty Flag or Flag-Beclin 1, and with pcDNA3.1 or AAA Myc-Bcl-2. Graphical data denote mean ± SEM.

(A) Immunoblot analysis with anti-LC3 antibody shows that DETA NONOate reduced autophagosome synthesis in bafilomycin A1-treated WT Bcl-2 and AAA Bcl-2 MEFs.

(B and C) NO donors decreased EGFP-LC3 vesicles in EGFP-LC3-transfected WT Bcl-2 and AAA Bcl-2 MEFs (C). Images were acquired by a confocal microscope (B). WT Bcl-2 and AAA Bcl-2 MEFs were analyzed separately.

(D) NO donors increased EGFP-HDQ74 aggregates in EGFP-HDQ74-transfected WT Bcl-2 and AAA Bcl-2 MEFs. WT Bcl-2 and AAA Bcl-2 MEFs were analyzed separately.

(E) Immunoblot analysis with anti-LC3 antibody shows that DETA NONOate reduced autophagosome synthesis in bafilomycin A1-treated WT Jnk, Jnk1−/−, and Jnk2−/− MEFs.

(F) Immunoblot analyses with anti-phospho-S6K and anti-phospho-S6 antibodies show that NO donors activated mTORC1 in HeLa cells.

(G) Confocal microscope images of immunofluorescence with anti-phospho-S6 antibody show that DETA NONOate increased S6 phosphorylation; arrowhead shows a cell where this effect was not observed.

(H) Immunoblot analyses with anti-phospho-S6K and anti-phospho-S6 antibodies show that NO donors activated mTORC1 in WT Bcl-2 and AAA Bcl-2 MEFs.

(I) Confocal microscope images of immunofluorescence with anti-phospho-mTOR and anti-LAMP1 antibodies in HeLa cells show that DETA NONOate increased phospho-mTOR but did not alter its distribution with lysosomes. Graphical data denote mean ± SEM.

(A) Immunoblot analyses with anti-phospho-S6K and anti-phospho-S6 antibodies show that NO donors activated mTORC1 in Tsc2+/+ MEFs, but not in Tsc2−/−, MEFs.

(B) NO donors reduced phosphorylation of IKKα/β and AMPKα in MEFs, as analyzed by immunoblotting with anti-phospho-IKKα/β and anti-phospho-AMPKα antibodies, respectively.

(C) Immunoblot analyses with anti-phospho-S6K and anti-phospho-S6 antibodies show that NO donors activated mTORC1 in Ikkβ+/+ MEFs, but not in Ikkβ−/− MEFs.

(D) Immunoblot analysis with anti-LC3 antibody shows that DETA NONOate reduced autophagosome synthesis in bafilomycin A1-treated Tsc2+/+ and Tsc2−/− MEFs.

(E) DETA NONOate decreased EGFP-LC3 vesicles in Tsc2+/+ and Tsc2−/−MEFs transfected with EGFP-LC3, along with either pcDNA3.1 or AAA Myc-Bcl-2. Although it further reduced EGFP-LC3 vesicles in Tsc2+/+MEFs expressing AAA Myc-Bcl-2 compared to mock-transfected Tsc2+/+MEFs, this effect was not seen in Tsc2−/−MEFs. Tsc2+/+ and Tsc2−/−MEFs were analyzed separately. Graphical data denote mean ± SEM.

(A-D) Immunoblot analyses with anti-LC3, along with anti-nNOS, anti-iNOS, and anti-eNOS antibodies, show decreased LC3-II levels in stable HEK293 cell lines overexpressing nNOS (A and D), iNOS-GFP (B and D), or eNOS (C and D) compared to HEK293 control cells in the presence or absence of bafilomycin A1.

(E and F) mCherry-LC3 vesicles were reduced in mCherry-LC3-transfected stable HEK293 NOS cell lines compared to HEK293 control cells cultured in HBSS, an effect that was restored in the NOS cells by L-NAME (F). Images were acquired by a confocal microscope (E).

(G and H) Confocal microscopy images (G) and immunofluorescence analysis with anti-Atg16 antibody show that stable HEK293 NOS cell lines had fewer Atg16-positive structures under starvation, compared to HEK293 control cells (H). Graphical data denote mean ± SEM.

(A-F) Immunoblot analyses with anti-nNOS, anti-iNOS, anti-eNOS, anti-phospho-JNK1, anti-phospho-Bcl-2, anti-phospho-S6K, and anti-phospho-S6 antibodies show that stable HEK293 cell lines overexpressing nNOS (A and D), iNOS-GFP (B and E), or eNOS (C and F) inhibited both the JNK1-Bcl-2 and mTORC1 pathways compared to the HEK293 control cells under basal (FM) (A-C) or starvation (HBSS) (D-F) conditions. Graphical data denote mean ± SEM.

(A) Immunoblot analyses with anti-LC3 antibody show that rapamycin (8 hr) and L-NAME (24 hr) increased autophagosome synthesis in bafilomycin A1-treated mouse primary cortical neurons and HeLa cells.

(B and C) Confocal microscopy images (B) and analysis of autophagic flux by automated Cellomics microscope (C) show that L-NAME increased autolysosomes in mRFP-GFP-LC3 HeLa cells.

(D) L-NAME reduced EGFP-HDQ74 aggregates in EGFP-HDQ74-transfected Atg5+/+, but not in Atg5−/−, MEFs.

(E) Drosophila expressing mutant huntingtin exon 1 (Q120) shows a significant decrease in neurodegeneration (p < 0.001, paired t test) upon L-NAME treatment compared to DMSO.

(F) Expression of an endogenous negative regulator of NOS activity (NOS4) significantly attenuates neurodegeneration (p < 0.05, paired t test) in Drosophila expressing mutant huntingtin exon 1 (Q120).

(G-I) Images from the retina of transgenic HD zebrafish show mutant huntingtin aggregates (arrows) (G). Treatment with rapamycin or L-NAME reduced the number of aggregates (H). L-NAME did not reduce aggregates in the presence of NH4Cl, which increased aggregate count (I).

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