Pancreatic ductal adenocarcinoma (PDAC), one of the most aggressive human malignancies, is thought to be initiated by KRAS activation. Here, we find that transcriptional activation mediated by the GLI family of transcription factors, although dispensable for pancreatic development, is required for KRAS induced pancreatic transformation. Inhibition of GLI using a dominant-negative repressor (Gli3T) inhibits formation of precursor Pancreatic Intraepithelial Neoplasia (PanIN) lesions in mice, and significantly extends survival in a mouse model of PDAC. Further, ectopic activation of the GLI1/2 transcription factors in mouse pancreas accelerates KRAS driven tumor formation and reduces survival, underscoring the importance of GLI transcription factors in pancreatic tumorigenesis. Interestingly, we find that although canonical GLI activity is regulated by the Hedgehog ligands, in the context of PDAC, GLI transcription factors initiate a unique ligand-independent transcriptional program downstream of KRAS, that involves regulation of the RAS, PI3K/AKT, and NF-кB pathways. We identify I-kappa-B kinase epsilon (IKBKE) as a PDAC specific target of GLI, that can also regulate GLI transcriptional activity via positive feedback mechanism involving regulation of GLI subcellular localization. Using human PDAC cells, and an in vivo model of pancreatic neoplasia, we establish IKBKE as a novel regulator pf pancreatic tumorigenesis that acts as an effector of KRAS/GLI, and mediates pancreatic transformation. We show that genetic knockout of Ikbke leads to a dramatic inhibition of initiation and progression of pancreatic intraepithelial viii neoplasia (PanIN) lesions in mice carrying pancreas specific activation of oncogenic Kras. Furthermore, we find that although IKBKE is a known NF-кB activator, it only modestly regulates NF-кB activity in PDAC. Instead, we find that IKBKE strongly promotes AKT phosphorylation in PDAC in vitro and in vivo, and that IKBKE mediates reactivation of AKT post-inhibition of mTOR. We also show that while mTOR inhibition alone does not significantly affect pancreatic tumorigenesis, combined inhibition of IKBKE and mTOR has a synergistic effect leading to significant decrease tumorigenicity of PDAC cells. Together, our findings identify GLI/IKBKE signaling as an important oncogenic effector pathway of KRAS in PDAC that regulates tumorigenicity, cell proliferation, and apoptosis via regulation of AKT and NF-кB signaling. We provide proof of concept for therapeutic targeting of GLI/IKBKE in PDAC, and support the evaluation of IKBKE as a therapeutic target in treatment of pancreatic cancer, and IKBKE inhibition as a strategy to improve efficacy of mTOR inhibitors in the clinic.

A infecção persistente por HPV-16 está fortemente associada ao risco de desenvolvimento de neoplasias do colo do útero, vagina, vulva, pênis, canal anal e orofaringe. O estudo detalhado da variabilidade nucleotídica intra-típica de HPV-16 resultou em importantes achados no que concerne à filogenia e evolução viral, e à história natural das infecções. Variantes Asiático-Americanas (AA) e E-350G de HPV-16 foram associadas com maior risco de persistência da infecção viral e desenvolvimento de câncer de colo de útero quando comparadas à variante Européia protótipo (E-P ou E-350T), embora esta ainda apresente alto risco quando comparada aos outros tipos virais. Mais recentemente, diferenças funcionais entre as proteínas E6/E7 das distintas variantes moleculares de HPV- 16 estão sendo descritas, a fim de explicar as diferenças nas associações epidemiológicas observadas. Dados do nosso grupo apontaram para a transcrição aumentada do gene MEK2 especificamente em queratinócitos humanos primários (PHKs) transduzidos com E6/E7 da variante E-350G. Pelo exposto, objetivou-se: (1) Analisar os níveis de ativação de proteínas efetoras das vias de transdução de sinal mediadas por MAPK e PI3K/AKT em queratinócitos imortalizados por E6/E7 de três variantes moleculares de HPV-16 (AA, E-P, E-350G); (2) Analisar os efeitos das proteínas E6/E7 dessas variantes sob as vias de MAPK quanto à indução de fatores de transcrição; (3) Analisar o potencial transformante de PHKs imortalizados pelas diferentes variantes, e em cooperação com a proteína celular c-MYC; (4) Analisar o potencial de migração e invasão em PHKs imortalizados pelas diferentes variantes de HPV-16, e em cooperação com a proteína celular c-MYC. Neste estudo observou-se que a variante AA de HPV-16 induziu a maior ativação das vias de sinalização estudadas (MAPK, e PI3K/AKT). Ademais, PHKs imortalizados por esta variante apresentaram maior capacidade de migração, de invasão através de uma matriz de colágeno, além de maior potencial transformante. Adicionalmente, as células imortalizadas pela variante AA apresentaram maior expressão da proteína mesenquimal vimentina e diminuição dos níveis da proteína epitelial E-caderina, sugerindo ativação parcial de Transição Epitélio Mesênquima (EMT) nestes queratinócitos. Ademais, quando o oncogene c-MYC foi co-transduzido nas diferentes linhagens infectadas por E6/E7 de HPV-16, foi observado que em PHKs imortalizados pela variante AA também houve maior ativação da via de MAPK-ERK, maior migração, e um potencial transformante semelhante, em relação às células co-transduzidas pela variante E-350G e c-MYC. Em conjunto, estes dados sugerem que a variante AA de HPV-16 possui vantagem seletiva sob as outras variantes em promover transformação celular, migração e invasão, e isto poderia explicar, ao menos em parte, a maior prevalência desta variante no câncer cervical. Os resultados gerados neste estudo são de extrema relevância para avaliar o impacto da variabilidade intra-típica de HPV-16 sobre o potencial oncogênico observado em estudos epidemiológicos / Persistent infection with HPV-16 is strongly associated with risk of developing neoplasia in the uterine cervix, vagina, vulva, penis, anal canal and oropharynx. The detailed study of HPV-16 intra-typical nucleotide variability resulted in important findings regarding phylogeny and viral evolution, and the natural history of infections. Asian-American (AA) and E-350G variants of HPV-16 were associated with increased risk of persistent viral infection and development of cervical cancer compared to the European prototype (E-P or E-350T), although this variant still presents higher risk when compared to other viral types. More recently, functional differences between the E6/E7 proteins of distinct molecular variants of HPV-16 are being described, in order to explain the differences in the epidemiological associations observed. Data from our group pointed to increased transcription of the MEK2 gene specifically in primary human keratinocytes (PHKs) transducing E6/E7 of the E-350G variant. Consequently, the aims of this study were: 1) To examine the activation levels of effector proteins of the signal transduction pathways mediated by MAPK and PI3K/AKT in PHKs immortalized by E6/E7 of three different molecular variants of HPV-16 (AA, E-P, E-350G); (2) To analyze the effects of E6/E7 of different molecular variants of HPV-16 upon MAPK pathways concerning the induction of transcription factors; (3) To analyze the transforming potential of PHKs immortalized by different molecular variants of HPV-16, and in cooperation with the cellular protein c- MYC; (4) To analyze the potential of migration and invasion in PHKs immortalized by different molecular variants of HPV-16, and in cooperation with the cellular protein c- MYC. In this study we observed that the AA variant of HPV-16 induced higher activation of both signaling pathways studied (MAPK, and PI3K/AKT). Furthermore, this variant presented increased migration capacity, higher invasion through a collagen matrix, and greater transforming potential. Moreover, cells immortalized by the AA variant showed higher expression of the mesenchymal protein vimentin and a decrease of the epithelial protein E-cadherin, suggesting partial activation of Epithelial Mesenchymal Transition (EMT). In addition, when the c-MYC oncogene was co-transduced in the different cells lines infected with HPV-16 E6/E7, we observed that in PHKs immortalized by the AA variant there was also an enhanced activation of the MAPK-ERK pathway, a higher ability to migrate, and similar transformation potential in comparison with cells co-transduced with the E-350G variant and c-MYC. Taken together, this data suggest that the AA molecular variant of the HPV-16 has a selective advantage over the other variants to promote cell transformation, migration and invasion, and this could partly explain the higher prevalence of this variant in cervical cancer. The results generated in this study are very important to assess the impact of intra-typical variability of HPV-16 on the oncogenic potential observed in epidemiological studies

A infecção persistente por HPV-16 está fortemente associada ao risco de desenvolvimento de neoplasias do colo do útero, vagina, vulva, pênis, canal anal e orofaringe. O estudo detalhado da variabilidade nucleotídica intra-típica de HPV-16 resultou em importantes achados no que concerne à filogenia e evolução viral, e à história natural das infecções. Variantes Asiático-Americanas (AA) e E-350G de HPV-16 foram associadas com maior risco de persistência da infecção viral e desenvolvimento de câncer de colo de útero quando comparadas à variante Européia protótipo (E-P ou E-350T), embora esta ainda apresente alto risco quando comparada aos outros tipos virais. Mais recentemente, diferenças funcionais entre as proteínas E6/E7 das distintas variantes moleculares de HPV- 16 estão sendo descritas, a fim de explicar as diferenças nas associações epidemiológicas observadas. Dados do nosso grupo apontaram para a transcrição aumentada do gene MEK2 especificamente em queratinócitos humanos primários (PHKs) transduzidos com E6/E7 da variante E-350G. Pelo exposto, objetivou-se: (1) Analisar os níveis de ativação de proteínas efetoras das vias de transdução de sinal mediadas por MAPK e PI3K/AKT em queratinócitos imortalizados por E6/E7 de três variantes moleculares de HPV-16 (AA, E-P, E-350G); (2) Analisar os efeitos das proteínas E6/E7 dessas variantes sob as vias de MAPK quanto à indução de fatores de transcrição; (3) Analisar o potencial transformante de PHKs imortalizados pelas diferentes variantes, e em cooperação com a proteína celular c-MYC; (4) Analisar o potencial de migração e invasão em PHKs imortalizados pelas diferentes variantes de HPV-16, e em cooperação com a proteína celular c-MYC. Neste estudo observou-se que a variante AA de HPV-16 induziu a maior ativação das vias de sinalização estudadas (MAPK, e PI3K/AKT). Ademais, PHKs imortalizados por esta variante apresentaram maior capacidade de migração, de invasão através de uma matriz de colágeno, além de maior potencial transformante. Adicionalmente, as células imortalizadas pela variante AA apresentaram maior expressão da proteína mesenquimal vimentina e diminuição dos níveis da proteína epitelial E-caderina, sugerindo ativação parcial de Transição Epitélio Mesênquima (EMT) nestes queratinócitos. Ademais, quando o oncogene c-MYC foi co-transduzido nas diferentes linhagens infectadas por E6/E7 de HPV-16, foi observado que em PHKs imortalizados pela variante AA também houve maior ativação da via de MAPK-ERK, maior migração, e um potencial transformante semelhante, em relação às células co-transduzidas pela variante E-350G e c-MYC. Em conjunto, estes dados sugerem que a variante AA de HPV-16 possui vantagem seletiva sob as outras variantes em promover transformação celular, migração e invasão, e isto poderia explicar, ao menos em parte, a maior prevalência desta variante no câncer cervical. Os resultados gerados neste estudo são de extrema relevância para avaliar o impacto da variabilidade intra-típica de HPV-16 sobre o potencial oncogênico observado em estudos epidemiológicos / Persistent infection with HPV-16 is strongly associated with risk of developing neoplasia in the uterine cervix, vagina, vulva, penis, anal canal and oropharynx. The detailed study of HPV-16 intra-typical nucleotide variability resulted in important findings regarding phylogeny and viral evolution, and the natural history of infections. Asian-American (AA) and E-350G variants of HPV-16 were associated with increased risk of persistent viral infection and development of cervical cancer compared to the European prototype (E-P or E-350T), although this variant still presents higher risk when compared to other viral types. More recently, functional differences between the E6/E7 proteins of distinct molecular variants of HPV-16 are being described, in order to explain the differences in the epidemiological associations observed. Data from our group pointed to increased transcription of the MEK2 gene specifically in primary human keratinocytes (PHKs) transducing E6/E7 of the E-350G variant. Consequently, the aims of this study were: 1) To examine the activation levels of effector proteins of the signal transduction pathways mediated by MAPK and PI3K/AKT in PHKs immortalized by E6/E7 of three different molecular variants of HPV-16 (AA, E-P, E-350G); (2) To analyze the effects of E6/E7 of different molecular variants of HPV-16 upon MAPK pathways concerning the induction of transcription factors; (3) To analyze the transforming potential of PHKs immortalized by different molecular variants of HPV-16, and in cooperation with the cellular protein c- MYC; (4) To analyze the potential of migration and invasion in PHKs immortalized by different molecular variants of HPV-16, and in cooperation with the cellular protein c- MYC. In this study we observed that the AA variant of HPV-16 induced higher activation of both signaling pathways studied (MAPK, and PI3K/AKT). Furthermore, this variant presented increased migration capacity, higher invasion through a collagen matrix, and greater transforming potential. Moreover, cells immortalized by the AA variant showed higher expression of the mesenchymal protein vimentin and a decrease of the epithelial protein E-cadherin, suggesting partial activation of Epithelial Mesenchymal Transition (EMT). In addition, when the c-MYC oncogene was co-transduced in the different cells lines infected with HPV-16 E6/E7, we observed that in PHKs immortalized by the AA variant there was also an enhanced activation of the MAPK-ERK pathway, a higher ability to migrate, and similar transformation potential in comparison with cells co-transduced with the E-350G variant and c-MYC. Taken together, this data suggest that the AA molecular variant of the HPV-16 has a selective advantage over the other variants to promote cell transformation, migration and invasion, and this could partly explain the higher prevalence of this variant in cervical cancer. The results generated in this study are very important to assess the impact of intra-typical variability of HPV-16 on the oncogenic potential observed in epidemiological studies

No / Flavonoids are plant-derived polyphenolic compounds with neuroprotective properties. Recent work suggests that, in addition to acting as hydrogen donors, they activate protective signalling pathways. The anti-oxidant response element (ARE) promotes the expression of protective proteins including those required for glutathione synthesis (xCT cystine antiporter, gamma-glutamylcysteine synthetase and glutathione synthase). The use of a luciferase reporter (ARE-luc) assay showed that the dietary flavan-3-ol (-)epicatechin activates this pathway in primary cortical astrocytes but not neurones. We also examined the distribution of NF-E2-related factor-2 (Nrf2), a key transcription factor in ARE-mediated gene expression. We found, using immunocytochemistry, that Nrf2 accumulated in the nuclei of astrocytes following exposure to tert-butylhydroquinone (100 microM) and (-)epicatechin (100 nM). (-)Epicatechin signalling via Nrf2 was inhibited by wortmannin implicating a phosphatidylinositol 3-kinase-dependent pathway. Finally, (-)epicatechin increased glutathione levels in astrocytes consistent with an up-regulation of ARE-mediated gene expression. Together, this suggests that flavonoids may be cytoprotective by increasing anti-oxidant gene expression.

No / The alpha-amino-3-hydroxyl-5-methyl-4-isoxazole-propionate receptor (AMPAR) subunit GluR2, which regulates excitotoxicity and the inflammatory cytokine tumour necrosis factor alpha (TNFalpha) have both been implicated in motor neurone vulnerability in amyotrophic lateral sclerosis/motor neurone disease. TNFalpha has been reported to increase cell surface expression of AMPAR subunits to increase synaptic strength and enhance excitotoxicity, but whether this mechanism occurs in motor neurones is unknown. We used primary cultures of mouse motor neurones and cortical neurones to examine the interaction between TNFalpha receptor activation, GluR2 availability, AMPAR-mediated calcium entry and susceptibility to excitotoxicity. Short exposure to a physiologically relevant concentration of TNFalpha (10 ng/mL, 15 min) caused a marked redistribution of both GluR1 and GluR2 to the cell surface as determined by cell surface biotinylation and immunofluorescence. Using fura-2-acetoxymethyl ester microfluorimetry, we showed that exposure to TNFalpha caused a rapid reduction in the peak amplitude of AMPA-mediated calcium entry in a PI3-kinase and p38 kinase-dependent manner, consistent with increased insertion of GluR2-containing AMPAR into the plasma membrane. This resulted in a protection of motor neurones against kainate-induced cell death. Our data therefore, suggest that TNFalpha acts primarily as a physiological regulator of synaptic activity in motor neurones rather than a pathological drive in amyotrophic lateral sclerosis.