Navegando por Autor "Agnez-Lima, Lucymara Fassarella"
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Artigo Chemical inhibition of Apurinic-apyrimidinic endonuclease 1 Redox and DNA repair functions affects the inflammatory response via different but overlapping mechanisms(Frontiers, 2021) Oliveira, Thais Teixeira; Fontes-Dantas, Fabrícia Lima; Oliveira, Rayssa Karla de Medeiros; Pinheiro, Daniele Maria Lopes; Coutinho, Leonam Gomes; Silva, Vandeclecio Lira da; Souza, Sandro José de; Agnez-Lima, Lucymara FassarellaThe presence of oxidized DNA lesions, such as 7,8-dihydro-8-oxoguanine (8-oxoG) and apurinic/apyrimidinic sites (AP sites), has been described as epigenetic signals that are involved in gene expression control. In mammals, Apurinic-apyrimidinic endonuclease 1/Redox factor-1 (APE1/Ref-1) is the main AP endonuclease of the base excision repair (BER) pathway and is involved in active demethylation processes. In addition, APE1/Ref-1, through its redox function, regulates several transcriptional factors. However, the transcriptional control targets of each APE1 function are not completely known. In this study, a transcriptomic approach was used to investigate the effects of chemical inhibition of APE1/Ref-1 redox or DNA repair functions by E3330 or methoxyamine (MX) in an inflammatory cellular model. Under lipopolysaccharide (LPS) stimulation, both E3330 and MX reduced the expression of some cytokines and chemokines. Interestingly, E3330 treatment reduced cell viability after 48 h of the treatment. Genes related to inflammatory response and mitochondrial processes were downregulated in both treatments. In the E3330 treatment, RNA processing and ribosome biogenesis genes were downregulated, while they were upregulated in the MX treatment. Furthermore, in the E3330 treatment, the cellular stress response was the main upregulated process, while the cellular macromolecule metabolic process was observed in MX-upregulated genes. Nuclear respiratory factor 1 (NRF1) was predicted to be a master regulator of the downregulated genes in both treatments, while the ETS transcription factor ELK1 (ELK1) was predicted to be a master regulator only for E3330 treatment. Decreased expression of ELK1 and its target genes and a reduced 28S/18S ratio were observed, suggesting impaired rRNA processing. In addition, both redox and repair functions can affect the expression of NRF1 and GABPA target genes. The master regulators predicted for upregulated genes were YY1 and FLI1 for the E3330 and MX treatments, respectively. In summary, the chemical inhibition of APE1/Ref-1 affects gene expression regulated mainly by transcriptional factors of the ETS family, showing partial overlap of APE1 redox and DNA repair functions, suggesting that these activities are not entirely independent. This work provides a new perspective on the interaction between APE1 redox and DNA repair activity in inflammatory response modulation and transcriptionTCC Perfil de expressão dos genes APEX1, OGG1 e PARP1 em células do sangue periférico de pessoas com a Síndrome de Berardinelli-Seip do Nordeste do Brasil(Universidade Federal do Rio Grande do Norte, 2016) Sarmento, Aquiles Sales Craveiro; Agnez-Lima, Lucymara Fassarella; Lima, Josivan Gomes de; Ferreira, Leonardo CapistranoA síndrome de Berardinelli-Seip (BSCL) é uma lipodistrofia autossômica recessiva rara caracterizada pela ausência quase completa do tecido adiposo, resultando em distúrbios no metabolismo de carboidratos e lipídios, resistência à insulina e deficiências cognitivas variáveis. Já foi visto que o Nordeste do Brasil tem a maior prevalência da BSCL no Brasil. Recentemente, alguns estudos sugeriram um papel das espécies reativas de oxigénio (ROS) na fisiopatologia da síndrome. Além disso, disfunção mitocondrial que conduz a danos oxidados no DNA também tem sido uma hipótese associada com as mutações encontradas em pacientes com BSCL. Uma vez que o Reparo por Excisão de Bases (BER) está envolvido na remoção de lesões oxidadas no DNA, o objetivo desse estudo foi avaliar o perfil de expressão de mRNA de importantes enzimas da via BER (APE-1, OGG1 e PARP-1), em células de sangue periférico de portadores da BSCL, bem como analisar a taxa de purinas com lesões oxidadas nesses genomas. As evidências apontaram um aumento médio de 305% na expressão de APEX1 e 335% na de OGG1, bem como uma diminuição média de 65% na expressão de PARP1 nas células do sangue periférico dos portadores da BSCL em relação aos controles. Também observamos que a comparação entre purinas danificadas entre os dois grupos apresentou médias muito próximas, indicando que, talvez, a taxa de lesões oxidadas entre os controles e os portadores seja muito parecida. Esses resultados sugerem que APE-1 e OGG1 poderiam estar sendo recrutadas não só para o reparo, como também para outras vias nessas células de sangue periférico. A necessidade de uma maior transcrição para suprir uma demanda de reparo nos portadores poderia explicar a equivalência entre os danos de DNA entre os dois grupos. Além disso, a diminuição de expressão de PARP-1 é um fenômeno esperado em distúrbios de tecido adiposo, por causa da relação direta entre as funções dessa enzima e a diferenciação de adipócitos.Artigo Resveratrol decreases the expression of genes involved in inflammation through transcriptional regulation(2018-10-24) Pinheiro, Daniele Maria Lopes; Oliveira, Ana Helena Sales de; Coutinho, Leonam Gomes; Fontes, Fabrícia Lima; Oliveira, Rayssa Karla de Medeiros; Oliveira, Thais Teixeira; Faustino, André Luís Fonseca; Silva, Vandeclécio Lira da; Campos, Julliane Tamara Araújo de Melo; Lajus, Tirzah Braz Petta; Souza, Sandro José de; Agnez-Lima, Lucymara FassarellaOxidative stress generated during inflammation is associated with a wide range of pathologies. Resveratrol (RESV) displays anti-inflammatory and antioxidant activities, being a candidate for the development of adjuvant therapies for several inflammatory diseases. Despite this potential, the cellular responses induced by RESV are not well known. In this work, transcriptomic analysis was performed following lipopolysaccharide (LPS) stimulation of monocyte cultures in the presence of RESV. Induction of an inflammatory response was observed after LPS treatment and the addition of RESV led to decreases in expression of the inflammatory mediators, tumor necrosis factor-alpha (TNF-α), interleukin-8 (IL-8), and monocyte chemoattractant protein-1 (MCP-1), without cytotoxicity. RNA sequencing revealed 823 upregulated and 2098 downregulated genes (cutoff ≥2.0 or ≤−2.0) after RESV treatment. Gene ontology analysis showed that the upregulated genes were associated with metabolic processes and the cell cycle, consistent with normal cell growth and differentiation under an inflammatory stimulus. The downregulated genes were associated with inflammatory responses, gene expression, and protein modification. The prediction of master regulators using the iRegulon tool showed nuclear respiratory factor 1 (NRF1) and GA-binding protein alpha subunit (GABPA) as the main regulators of the downregulated genes. Using immunoprecipitation and protein expression assays, we observed that RESV was able to decrease protein acetylation patterns, such as acetylated apurinic/apyrimidinic endonuclease-1/reduction-oxidation factor 1 (APE1/Ref-1), and increase histone methylation. In addition, reductions in p65 (nuclear factor-kappa B (NF-κB) subunit) and lysine-specific histone demethylase-1 (LSD1) expression were observed. In conclusion, our data indicate that treatment with RESV caused significant changes in protein acetylation and methylation patterns, suggesting the induction of deacetylase and reduction of demethylase activities that mainly affect regulatory cascades mediated by NF-кB and Janus kinase/signal transducers and activators of transcription (JAK/STAT) signaling. NRF1 and GABPA seem to be the main regulators of the transcriptional profile observed after RESV treatment.Artigo XPA deficiency affects the ubiquitin-proteasome system function(Elsevier, 2020-07) Leal, Angélica Maria de Sousa; Medeiros, Lázaro Batista de Azevedo; Muñoz-Cadavid, Cesar Orlando; Oliveira, Riva de Paula; Timóteo, Ana Rafaela de Souza; Oliveira, Ana Helena Sales de; Faustino, André Luis Fonseca; Silva, Vandeclécio Lira da; Souza, Sandro José de; Lajus, Tirzah Braz Petta; Campos, Julliane Tamara Araújo de Melo; Agnez-Lima, Lucymara FassarellaXeroderma pigmentosum complementation group A (XPA), is defective in xeroderma pigmentosum patients, causing pre-disposition to skin cancer and neurological abnormalities, which is not well understood. Here, we analyzed the XPA-deficient cells transcriptional profile under oxidative stress. The imbalance in of ubiquitin-proteasome system (UPS) gene expression was observed in XPA-deficient cells and the involvement of nuclear factor erythroid 2-related factor-2 (NFE2L2) was indicated. Co-immunoprecipitation assays showed the interaction between XPA, apurinic-apyrimidinic endonuclease 1 (APE1) and NFE2L2 proteins. Decreased NFE2L2 protein expression and proteasome activity was also observed in XPA-deficient cells. The data suggest the involvement of the growth arrest and DNA-damage-inducible beta (GADD45β) in NFE2L2 functions. Similar results were obtained in xpa-1 (RNAi) Caenorhabditis elegans suggesting the conservation of XPA and NFE2L2 interactions. In conclusion, stress response activation occurs in XPA-deficient cells under oxidative stress; however, these cells fail to activate the UPS cytoprotective response, which may contribute to XPA patient’s phenotypes.