31 results on '"Benjamim, Claudia Farias"'
Search Results
2. Chikungunya and Mayaro Viruses Induce Chronic Skeletal Muscle Atrophy Triggered by Pro-Inflammatory and Oxidative Response.
- Author
-
da Silva, Mariana Oliveira Lopes, Figueiredo, Camila Menezes, Neris, Rômulo Leão Silva, Guimarães-Andrade, Iris Paula, Gavino-Leopoldino, Daniel, Miler-da-Silva, Leonardo Linhares, Valença, Helber da Maia, Ladislau, Leandro, de Lima, Caroline Victorino Felix, Coccarelli, Fernanda Meireles, Benjamim, Claudia Farias, and Assunção-Miranda, Iranaia
- Subjects
MAGNETIC resonance imaging ,MUSCULAR atrophy ,BODY composition ,MUSCLE mass ,WEIGHT gain ,SKELETAL muscle - Abstract
Chikungunya (CHIKV) and Mayaro (MAYV) viruses are arthritogenic alphaviruses that promote an incapacitating and long-lasting inflammatory muscle–articular disease. Despite studies pointing out the importance of skeletal muscle (SkM) in viral pathogenesis, the long-term consequences on its physiology and the mechanism of persistence of symptoms are still poorly understood. Combining molecular, morphological, nuclear magnetic resonance imaging, and histological analysis, we conduct a temporal investigation of CHIKV and MAYV replication in a wild-type mice model, focusing on the impact on SkM composition, structure, and repair in the acute and late phases of infection. We found that viral replication and induced inflammation promote a rapid loss of muscle mass and reduction in fiber cross-sectional area by upregulation of muscle-specific E3 ubiquitin ligases MuRF1 and Atrogin-1 expression, both key regulators of SkM fibers atrophy. Despite a reduction in inflammation and clearance of infectious viral particles, SkM atrophy persists until 30 days post-infection. The genomic CHIKV and MAYV RNAs were still detected in SkM in the late phase, along with the upregulation of chemokines and anti-inflammatory cytokine expression. In agreement with the involvement of inflammatory mediators on induced atrophy, the neutralization of TNF and a reduction in oxidative stress using monomethyl fumarate, an agonist of Nrf2, decreases atrogen expression and atrophic fibers while increasing weight gain in treated mice. These data indicate that arthritogenic alphavirus infection could chronically impact body SkM composition and also harm repair machinery, contributing to a better understanding of mechanisms of arthritogenic alphavirus pathogenesis and with a description of potentially new targets of therapeutic intervention. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
3. Elastase modifies bleomycin-induced pulmonary fibrosis in mice
- Author
-
Trajano, Larissa Alexsandra Silva Neto, Trajano, Eduardo Tavares Lima, Lanzetti, Manuella, Mendonça, Morena Scopel Amorim, Guilherme, Rafael Freitas, Figueiredo, Rodrigo Tinoco, Benjamim, Cláudia Farias, Valenca, Samuel Santos, Costa, Andréa Monte Alto, and Porto, Luís Cristóvão
- Published
- 2016
- Full Text
- View/download PDF
4. High mobility group box 1, ATP , lipid mediators, and tissue factor are elevated in COVID ‐19 patients: HMGB1 as a biomarker of worst prognosis
- Author
-
Vicentino, Amanda Roberta Revoredo, primary, Fraga‐Junior, Vanderlei da Silva, additional, Palazzo, Matheus, additional, Tasmo, Natalia Recardo Amorim, additional, Rodrigues, Danielle A. S., additional, Barroso, Shana Priscila Coutinho, additional, Ferreira, Sâmila Natiane, additional, Neves‐Borges, Anna Cristina, additional, Allonso, Diego, additional, Fantappié, Marcelo Rosado, additional, Scharfstein, Julio, additional, Oliveira, Ana Carolina, additional, Vianna‐Jorge, Rosane, additional, Vale, André Macedo, additional, Coutinho‐Silva, Robson, additional, Savio, Luiz Eduardo Baggio, additional, Canetti, Claudio, additional, and Benjamim, Claudia Farias, additional
- Published
- 2023
- Full Text
- View/download PDF
5. Ready-to-drink Matte® tea (diet and regular) increased life span and pulmonary health in aged mice
- Author
-
Lanzetti, Manuella, Pires, Karla Maria Pereira, Santos, Juliana Cardoso, Ribeiro, Marcelo Lima, Borges, Ricardo Moreira, da Silva, Antônio Jorge Ribeiro, Porto, Luís Cristóvão, Benjamim, Cláudia Farias, and Valenca, Samuel Santos
- Published
- 2013
- Full Text
- View/download PDF
6. Critical role for CCR2 and HMGB1 in induction of experimental endotoxic shock
- Author
-
Alves, Jackson Nogueira, Pires, Karla Maria Pereira, Lanzetti, Manuella, Barroso, Marina Valente, Benjamim, Cláudia Farias, Costa, Cristiane Aguiar, Resende, Angela Castro, Santos, Juliana Carvalho, Ribeiro, Marcelo Lima, Porto, Luís Cristóvão, and Valença, Samuel Santos
- Published
- 2013
- Full Text
- View/download PDF
7. Activated Microglia-Induced Deficits in Excitatory Synapses Through IL-1β: Implications for Cognitive Impairment in Sepsis
- Author
-
Moraes, Carolina A., Santos, Gabriel, Spohr, Tania Cristina Leite de Sampaio e, D’Avila, Joana C., Lima, Flávia Regina Souza, Benjamim, Claudia Farias, Bozza, Fernando A., and Gomes, Flávia Carvalho Alcantara
- Published
- 2015
- Full Text
- View/download PDF
8. HMGB1 correlates with severity and death of COVID-19 patients
- Author
-
Vicentino, Amanda Roberta Revoredo, primary, Fraga Junior, Vanderlei da Silva, additional, Palazzo, Matheus, additional, Tasmo, Natalia Recardo Amorim, additional, Rodrigues, Danielle A. S., additional, Barroso, Shana Priscila Coutinho, additional, Ferreira, Samila Natiane, additional, Borges, Anna Cristina Neves, additional, Allonso, Diego, additional, Fantappie, Marcelo Rosado, additional, Scharfstein, Julio, additional, Oliveira, Ana Carolina, additional, Vianna-Jorge, Rosane, additional, Vale, André Macedo, additional, Coutinho-Silva, Robson, additional, Savio, Luiz Eduardo Baggio, additional, Canetti, Claudio, additional, and Benjamim, Claudia Farias, additional
- Published
- 2022
- Full Text
- View/download PDF
9. Skeletal Muscle Is an Early Site of Zika Virus Replication and Injury, Which Impairs Myogenesis
- Author
-
Gavino-Leopoldino, Daniel, primary, Figueiredo, Camila Menezes, additional, da Silva, Mariana Oliveira Lopes, additional, Barcellos, Letícia Gonçalves, additional, Neris, Rômulo Leão Silva, additional, Pinto, Laryssa Daniele Miranda, additional, Araújo, Suzana Maria Bernardino, additional, Ladislau, Leandro, additional, Benjamim, Claudia Farias, additional, Da Poian, Andrea T., additional, Clarke, Julia Rosauro, additional, Figueiredo, Claudia Pinto, additional, and Assunção-Miranda, Iranaia, additional
- Published
- 2021
- Full Text
- View/download PDF
10. CCR2 Receptor Is Essential to Activate Microbicidal Mechanisms to Control Toxoplasma gondii Infection in the Central Nervous System
- Author
-
Benevides, Luciana, Milanezi, Cristiane Maria, Yamauchi, Lucy Megumi, Benjamim, Cláudia Farias, Silva, João Santana, and Silva, Neide Maria
- Published
- 2008
- Full Text
- View/download PDF
11. Adenosine Diphosphate Improves Wound Healing in Diabetic Mice Through P2Y12 Receptor Activation
- Author
-
Borges, Paula Alvarenga, primary, Waclawiak, Ingrid, additional, Georgii, Janaína Lima, additional, Fraga-Junior, Vanderlei da Silva, additional, Barros, Janaína Figueiredo, additional, Lemos, Felipe Simões, additional, Russo-Abrahão, Thaís, additional, Saraiva, Elvira Maria, additional, Takiya, Christina M., additional, Coutinho-Silva, Robson, additional, Penido, Carmen, additional, Mermelstein, Claudia, additional, Meyer-Fernandes, José Roberto, additional, Canto, Fábio B., additional, Neves, Josiane Sabbadini, additional, Melo, Paulo A., additional, Canetti, Claudio, additional, and Benjamim, Claudia Farias, additional
- Published
- 2021
- Full Text
- View/download PDF
12. Zika virus replicates in skeletal muscle contributing to peripheral viral amplification prior to reach neural tissue
- Author
-
Gavino-Leopoldino, Daniel, primary, Figueiredo, Camila Menezes, additional, Barcellos, Letícia Gonçalves, additional, da Silva, Mariana Oliveira Lopes, additional, Bernardino Araújo, Suzana Maria, additional, da Silva Neris, Rômulo Leão, additional, Miranda, Laryssa Daniele, additional, Ladislau, Leandro, additional, Benjamim, Claudia Farias, additional, Da Poain, Andrea Thompson, additional, Clarke, Julia Rosauro, additional, Figueiredo, Claudia Pinto, additional, and Assunção-Miranda, Iranaia, additional
- Published
- 2020
- Full Text
- View/download PDF
13. Adenosine Diphosphate Improves Wound Healing in Diabetic Mice Through P2Y12 Receptor Activation.
- Author
-
Borges, Paula Alvarenga, Waclawiak, Ingrid, Georgii, Janaína Lima, Fraga-Junior, Vanderlei da Silva, Barros, Janaína Figueiredo, Lemos, Felipe Simões, Russo-Abrahão, Thaís, Saraiva, Elvira Maria, Takiya, Christina M., Coutinho-Silva, Robson, Penido, Carmen, Mermelstein, Claudia, Meyer-Fernandes, José Roberto, Canto, Fábio B., Neves, Josiane Sabbadini, Melo, Paulo A., Canetti, Claudio, and Benjamim, Claudia Farias
- Subjects
ADENOSINE diphosphate ,ADENOSINES ,HEALING ,CHRONIC wounds & injuries ,SKIN injuries ,WOUND care ,WOUND nursing - Abstract
Chronic wounds are a public health problem worldwide, especially those related to diabetes. Besides being an enormous burden to patients, it challenges wound care professionals and causes a great financial cost to health system. Considering the absence of effective treatments for chronic wounds, our aim was to better understand the pathophysiology of tissue repair in diabetes in order to find alternative strategies to accelerate wound healing. Nucleotides have been described as extracellular signaling molecules in different inflammatory processes, including tissue repair. Adenosine-5'-diphosphate (ADP) plays important roles in vascular and cellular response and is immediately released after tissue injury, mainly from platelets. However, despite the well described effect on platelet aggregation during inflammation and injury, little is known about the role of ADP on the multiple steps of tissue repair, particularly in skin wounds. Therefore, we used the full-thickness excisional wound model to evaluate the effect of local ADP application in wounds of diabetic mice. ADP accelerated cutaneous wound healing, improved new tissue formation, and increased both collagen deposition and transforming growth factor-β (TGF-β) production in the wound. These effects were mediated by P2Y
12 receptor activation since they were inhibited by Clopidogrel (Clop) treatment, a P2Y12 receptor antagonist. Furthermore, P2Y1 receptor antagonist also blocked ADP-induced wound closure until day 7, suggesting its involvement early in repair process. Interestingly, ADP treatment increased the expression of P2Y12 and P2Y1 receptors in the wound. In parallel, ADP reduced reactive oxygen species (ROS) formation and tumor necrosis factor-α (TNF-α) levels, while increased IL-13 levels in the skin. Also, ADP increased the counts of neutrophils, eosinophils, mast cells, and gamma delta (γδ) T cells (Vγ4+ and Vγ5+ cells subtypes of γδ+ T cells), although reduced regulatory T (Tregs) cells in the lesion. In accordance, ADP increased fibroblast proliferation and migration, myofibroblast differentiation, and keratinocyte proliferation. In conclusion, we provide strong evidence that ADP acts as a pro-resolution mediator in diabetes-associated skin wounds and is a promising intervention target for this worldwide problem. [ABSTRACT FROM AUTHOR]- Published
- 2021
- Full Text
- View/download PDF
14. Downregulation of Microparticle Release and Pro-Inflammatory Properties of Activated Human Polymorphonuclear Neutrophils by LMW Fucoidan
- Author
-
Moraes, João Alfredo, primary, Frony, Ana Clara, additional, Barcellos-de-Souza, Pedro, additional, Menezes da Cunha, Marcel, additional, Brasil Barbosa Calcia, Thayanne, additional, Benjamim, Claudia Farias, additional, Boisson-Vidal, Catherine, additional, and Barja-Fidalgo, Christina, additional
- Published
- 2018
- Full Text
- View/download PDF
15. Wound healing properties of Copaifera paupera in diabetic mice
- Author
-
Amorim, Jorge Luis, primary, Figueiredo, Janaína de Barros, additional, Amaral, Ana Claudia Fernandes, additional, Barros, Eliane Gouvêa de Oliveira, additional, Palmero, Célia, additional, MPalantinos, Maria Athana, additional, Ramos, Aline de Souza, additional, Ferreira, José Luiz Pinto, additional, Silva, Jefferson Rocha de Andrade, additional, Benjamim, Claudia Farias, additional, Basso, Silvia Luciane, additional, Nasciutti, Luiz Eurico, additional, and Fernandes, Patricia Dias, additional
- Published
- 2017
- Full Text
- View/download PDF
16. Downregulation of Microparticle Release and Pro-Inflammatory Properties of Activated Human Polymorphonuclear Neutrophils by LMW Fucoidan.
- Author
-
Moraes, João Alfredo, Frony, Ana Clara, Barcellos-de-Souza, Pedro, Menezes da Cunha, Marcel, Brasil Barbosa Calcia, Thayanne, Benjamim, Claudia Farias, Boisson-Vidal, Catherine, and Barja-Fidalgo, Christina
- Published
- 2019
- Full Text
- View/download PDF
17. Ready-to-drink matte® tea shows anti-inflammatory and antioxidant properties on a cigarette smoke exposure model
- Author
-
Lanzetti, Manuella, Barroso, Marina Valente, Nesi, Renata Tiscoski, Lopes, Alan Aguiar, Trajano, Eduardo Tavares Lima, Alves, Jackson Nogueira, Brogliato, Ariane Rennó, Borges, Paula Alvarenga, Benjamim, Cláudia Farias, Porto, Luís Cristóvão, and Valenca, Samuel Santos
- Published
- 2012
- Full Text
- View/download PDF
18. The P2X7 Receptor Contributes to the Development of the Exacerbated Inflammatory Response Associated with Sepsis
- Author
-
Santana, Patricia Texeira, primary, Benjamim, Claudia Farias, additional, Martinez, Camila Guerra, additional, Kurtenbach, Eleonora, additional, Takiya, Christina Maeda, additional, and Coutinho-Silva, Robson, additional
- Published
- 2015
- Full Text
- View/download PDF
19. Activated Microglia-Induced Deficits in Excitatory Synapses Through IL-1β: Implications for Cognitive Impairment in Sepsis
- Author
-
Moraes, Carolina A., primary, Santos, Gabriel, additional, Spohr, Tania Cristina Leite de Sampaio e, additional, D’Avila, Joana C., additional, Lima, Flávia Regina Souza, additional, Benjamim, Claudia Farias, additional, Bozza, Fernando A., additional, and Gomes, Flávia Carvalho Alcantara, additional
- Published
- 2014
- Full Text
- View/download PDF
20. Ketoprofen Impairs Immunosuppression Induced by Severe Sepsis and Reveals an Important Role for Prostaglandin E2
- Author
-
Brogliato, Ariane Rennó, primary, Antunes, Carlos A., additional, Carvalho, Renato S., additional, Monteiro, Ana Paula T., additional, Tinoco, Rodrigo F., additional, Bozza, Marcelo T., additional, Canetti, Claudio, additional, Peters-Golden, Marc, additional, Kunkel, Steven L., additional, Vianna-Jorge, Rosane, additional, and Benjamim, Claudia Farias, additional
- Published
- 2012
- Full Text
- View/download PDF
21. Evaluation of 3-(3-chloro-phenyl)-5-(4-pyridyl)-4,5-dihydroisoxazole as a Novel Anti-Inflammatory Drug Candidate
- Author
-
Vicentino, Amanda Roberta Revoredo, primary, Carneiro, Vitor Coutinho, additional, Amarante, Anderson de Mendonça, additional, Benjamim, Claudia Farias, additional, de Aguiar, Alcino Palermo, additional, and Fantappié, Marcelo Rosado, additional
- Published
- 2012
- Full Text
- View/download PDF
22. Murine IL-17+ Vγ4 T lymphocytes accumulate in the lungs and play a protective role during severe sepsis
- Author
-
de Souza Costa, Maria Fernanda, Trigo de Negreiros, Catarina Bastos, Bornstein, Victor Ugarte, Valente, Richard Hemmi, Mengel, José, Graças Henriques, Maria das, Benjamim, Claudia Farias, and Penido, Carmen
- Abstract
Background: Lung inflammation is a major consequence of the systemic inflammatory response caused by severe sepsis. Increased migration of γδ T lymphocytes into the lungs has been previously demonstrated during experimental sepsis; however, the involvement of the γδ T cell subtype Vγ4 has not been previously described. Methods: Severe sepsis was induced by cecal ligation and puncture (CLP; 9 punctures, 21G needle) in male C57BL/ 6 mice. γδ and Vγ4 T lymphocyte depletion was performed by 3A10 and UC3-10A6 mAb i.p. administration, respectively. Lung infiltrating T lymphocytes, IL-17 production and mortality rate were evaluated. Results: Severe sepsis induced by CLP in C57BL/6 mice led to an intense lung inflammatory response, marked by the accumulation of γδ T lymphocytes (comprising the Vγ4 subtype). γδ T lymphocytes present in the lungs of CLP mice were likely to be originated from peripheral lymphoid organs and migrated towards CCL2, CCL3 and CCL5, which were highly produced in response to CLP-induced sepsis. Increased expression of CD25 by Vγ4 T lymphocytes was observed in spleen earlier than that by αβ T cells, suggesting the early activation of Vγ4 T cells. The Vγ4 T lymphocyte subset predominated among the IL-17
+ cell populations present in the lungs of CLP mice (unlike Vγ1 and αβ T lymphocytes) and was strongly biased toward IL-17 rather than toward IFN-γ production. Accordingly, the in vivo administration of anti-Vγ4 mAb abrogated CLP-induced IL-17 production in mouse lungs. Furthermore, anti-Vγ4 mAb treatment accelerated mortality rate in severe septic mice, demonstrating that Vγ4 T lymphocyte play a beneficial role in host defense. Conclusions: Overall, our findings provide evidence that early-activated Vγ4 T lymphocytes are the main responsible cells for IL-17 production in inflamed lungs during the course of sepsis and delay mortality of septic mice. [ABSTRACT FROM AUTHOR]- Published
- 2015
- Full Text
- View/download PDF
23. Inhibition of Leukocyte Rolling by Nitric Oxide during Sepsis Leads to Reduced Migration of Active Microbicidal Neutrophils
- Author
-
Benjamim, Claudia Farias, primary, Silva, João Santana, additional, Fortes, Zuleica Bruno, additional, Oliveira, Maria Aparecida, additional, Ferreira, Sérgio Henrique, additional, and Cunha, Fernando Queiroz, additional
- Published
- 2002
- Full Text
- View/download PDF
24. Ketoprofen Impairs Immunosuppression Induced by Severe Sepsis and Reveals an Important Role for Prostaglandin E2.
- Author
-
Brogliato, Ariane Rennó, Antunes, Carlos A., Carvalho, Renato S., Monteiro, Ana Paula T., Tinoco, Rodrigo F., Bozza, Marcelo T., Canetti, Claudio, Peters-Golden, Marc, Kunkel, Steven L., Vianna-Jorge, Rosane, and Benjamim, Claudia Farias
- Published
- 2012
- Full Text
- View/download PDF
25. Study of the Mechanisms Involved in Both Superoxide Anion Production and Dismutation in a Murine Model of Asthma
- Author
-
Santos Valenca, Samuel, Nesi, Renata Tiscoski, Lanzetti, Manuella, Pires, Karla Maria Pereira, Barroso, Marina Valente, Neves, Josiane Sabbadini, and Benjamim, Cláudia Farias
- Published
- 2012
- Full Text
- View/download PDF
26. Effects of dietary lipids on cutaneous tissue repair of mice
- Author
-
Schanuel, Fernanda Seabra, Costa, Andréa Monte Alto, El-cheikh, Marcia Cury, Benjamim, Claudia Farias, Gregório, Bianca Martins, and Daleprane, Júlio Beltrame
- Subjects
Inflammation ,Lesão ,Inflamação ,Gorduras na dieta ,Cicatrização de feridas ,Reparo tecidual ,Wound ,Issue repair ,Dieta ,Pele Reparos e reconstrução ,CIENCIAS BIOLOGICAS::MORFOLOGIA [CNPQ] ,Diet - Abstract
Submitted by Boris Flegr (boris@uerj.br) on 2021-01-05T18:07:31Z No. of bitstreams: 1 Fernanda Seabra Schanuel Tese completa.pdf: 3130326 bytes, checksum: 5828f987faa2171a997bf7add1f6ff21 (MD5) Made available in DSpace on 2021-01-05T18:07:31Z (GMT). No. of bitstreams: 1 Fernanda Seabra Schanuel Tese completa.pdf: 3130326 bytes, checksum: 5828f987faa2171a997bf7add1f6ff21 (MD5) Previous issue date: 2019-02-19 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior The role of lipids on wound healing has not been studied widely. To evaluate the effects of dietary lipids on cutaneous tissue repair of mice, we divided in two distinct work. The first work was consisted of evaluate the role of short-term administration of high-fat diet in the cutaneous repair of excisional wounds. The consumption of a high-fat diet leads to a low grade chronic inflammation in several tissues, including the skin, impairing its function. Animals fed with an obesogenic diet, both resistant and prone to overweight, present poor healing; highlighting the importance of diet composition in cutaneous tissue repair. Male mice (C57Bl/6) were randomly divided into standard chow (10% of energy from of lipids) and high-fat chow (60% of energy from lipids). Ten days after the beginning of diet administration, an excisional wound was made on the back of the animals and the diet administration continued until the sacrifice 6 or 10 days after wounding. There was no difference on glucose metabolism. Ten days after wounding, the high-fat chow group presented increased inflammatory infiltrate, inflammatory cytokines and lipid peroxidation. The high-fat chow group also presented delayed wound closure, increased amount of myofibroblasts and blood vessels and decreased collagen deposition. These findings show that short term administration of high-fat diet exerts a negative role on cutaneous repair, due to the prolongation of inflammatory phase. The second work evaluated the role of a diet containing olive oil on tissue repair of pressure injuries in mice. The administration of olive oil, which contains anti-inflammatory and antioxidant properties, helps in the treatment of several pathologies, among them the healing of chronic wounds. Male mice (Swiss) were fed with standard, or olive oil or soybean plus olive oil chows (all containing 10% of energy from lipids) for 4 weeks. After this period, the formation of pressure injury was induced on the back of the animals, and the animals continue feed with their respective diets until the sacrifice 14 days after wounding. The olive oil containing groups showed reduction in neutrophils cells and cyclooxygenase-2 protein expression, increased nitric oxide synthase-2 protein expression and lipid oxidation; and also increased collagen deposition, antioxidant response enzymes and contraction of pressure injuries; showing that the diet containing olive oil as the main lipid accelerates the cutaneous repair of pressure injuries through the reduction of oxidative damage and inflammation. O papel dos lipídeos na cicatrização não foi amplamente estudado. Para analisar os efeitos dos lipídeos da dieta sobre o reparo tecidual de camundongos dividimos em dois estudos distintos. O primeiro estudo consistiu em investigar o papel da dieta hiperlipídica administrada por curto prazo no reparo tecidual cutâneo de lesões excisionais cutâneas. O consumo de uma dieta rica em gordura a longo prazo induz a uma inflamação de baixo grau crônica em diversos tecidos, entre eles a pele, prejudicando o seu funcionamento. Animais alimentados com dieta obesogênica, tanto os resistentes quanto os propensos ao sobrepeso, apresentaram a cicatrização deficiente; mostrando a importância da composição da dieta no reparo tecidual cutâneo. Camundongos machos (C57Bl/6) foram divididos aleatoriamente em grupos ração padrão (10% da energia provenientes de lipídeos) e ração hiperlipídica (60% da energia proveniente de lipídeos). Dez dias após o início da administração da dieta, uma lesão excisional foi realizada no dorso dos animais e a administração da dieta continuou até o sacrifício 6 ou 10 dias após a lesão. Não houve diferença no metabolismo da glicose. Dez dias após a lesão o grupo ração hiperlipídica apresentou aumento do infiltrado inflamatório, de citocinas inflamatórias e da peroxidação lipídica. O grupo ração hiperlipídica também apresentou atraso no fechamento das lesões, aumento na quantidade de miofibroblastos e vasos sanguíneos e diminuição na deposição de colágeno. Esses achados demonstram que a administração de dieta hiperlipídica a curto prazo exerce um papel negativo no reparo cutâneo, devido ao prolongamento da fase inflamatória. O segundo estudo investigou o papel da dieta contendo óleo de oliva no reparo de lesões por pressão de camundongos. A administração de óleo de oliva, que contém propriedades anti-inflamatórias e antioxidantes, auxilia no tratamento de diversas patologias, entre elas a cicatrização de lesões crônicas. Camundongos machos (Swiss) foram alimentados com ração padrão, ou ração óleo de oliva ou ração óleo de soja mais óleo de oliva (todos contendo 10% da energia provenientes de lipídeos) durante 4 semanas. Após esse período, foi induzida a formação de lesões por pressão no dorso dos animais; e os animais continuaram se alimentando com as respectivas dietas até o sacrifício 14 dias após a lesão. Os grupos com óleo de oliva apresentaram redução de neutrófilos e da expressão proteica de ciclooxigenase-2, aumento da expressão proteica de óxido nítrico sintase 2 e oxidação lipídica; também apresentaram aumento de deposição de colágeno, de enzimas de resposta antioxidante e da contração de lesões por pressão; demonstrando que a dieta com óleo de oliva como lipídeo principal acelera o reparo cutâneo de lesões por pressão através da redução do dano oxidativo e da inflamação.
- Published
- 2019
27. Functional profile of CD4+ T cells from patients with neuromyelitis optica: study focused on the role of microbial antigens and toll-like receptors
- Author
-
Barros, Priscila de Oliveira, Bento, Cleonice Alves de Melo, Andrade, Arnaldo Feitosa Braga de, Ignacio, Ana Claudia de Paula Rosa, Saramago, Carmem Soares de Meirelles, Vasconcelos, Cláudia Cristina Ferreira, Benjamim, Claudia Farias, and Lopes, Giselle Pinto de Faria
- Subjects
Neuromielite óptica ,Doenças auto-imunes ,Esclerose múltipla ,Doenças autoimunes ,Autoimmune diseases ,Medula espinhal Inflamação ,CIENCIAS BIOLOGICAS::MICROBIOLOGIA::MICROBIOLOGIA APLICADA::MICROBIOLOGIA MEDICA [CNPQ] ,Neuromyelitis optica ,Mielite - Abstract
Submitted by Boris Flegr (boris@uerj.br) on 2021-01-07T15:14:02Z No. of bitstreams: 1 TESE_FINA_PUBLICADA_Priscila_de_Oliveira_Barros.pdf: 11739831 bytes, checksum: ece1bbcd990c72bbfb009438c2f2bdf2 (MD5) Made available in DSpace on 2021-01-07T15:14:02Z (GMT). No. of bitstreams: 1 TESE_FINA_PUBLICADA_Priscila_de_Oliveira_Barros.pdf: 11739831 bytes, checksum: ece1bbcd990c72bbfb009438c2f2bdf2 (MD5) Previous issue date: 2017-03-06 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Neuromyelitis optica spectrum diseases (NMOSD) is a group of inflammatory, idiopathic, autoimmune diseases that affect the central nervous system and, differently from multiple sclerosis, are mainly characterized by episodes of optic neuritis and/or extensive acute transverse myelitis. Despite genetic susceptibility, development and severity of NMOSD are influenced by environmental factors, like microbial molecules, that can impact the functional behavior of the T cells phenotype mainly implicated in NMOSD, the Th17 phenotype. In this context, the objective of the present thesis is to analyze functional aspects of CD4+ T cells from NMOSD patients, in remission, following in vitro activation with polyclonal and microbial stimulation and determine the Toll-like receptors (TLRs) expression pattern on these cells. In our first paper, the results showed a high immune reactivity of Th17 cells in response to E. coli, characterized by enhanced production of IL-17 and IL-6,. Interestingly, levels of these cytokines were directly associated to the disease severity, determined by the Expanded Disability Status Scale (EDSS) scores, and to IL-6 and IL-23 production in monocytes cultures when activated with lipopolysaccharide (LPS) from E. coli. The role of IL-6 as a cytokine involved in the pathogenesis of NMOSD was suggested in our second paper, in which the inhibition of the IL-6 receptor (IL-6R) signaling reduced the Th17-related cytokine production, enhanced IL-10 production and the ability of the corticoid in controlling the activation of these cells in vitro. As higher levels of LPS were detected in plasma from NMOSD patients, and they were positively correlated with EDSS scores, our last objective was to evaluate TLR expression on CD4+ T cells derived from patients. Our results showed an enhanced percentage of CD4+ T cells expressing TLR2, 4 and 9 when compared to healthy subjects. A more detailed phenotypical characterization demonstrated that a percentage of cells capable of producing, simultaneously, IL-17 and IL-6, was consistently associated to plasmatic levels of sCD14 and to NMOSD severity. On the other hand, IL-10-secreting Th17 TLR+ cells correlated inversely to the sCD14 levels and to EDSS scores. Taken together, our results suggest microbial products can effectively influence NMOSD prognosis by favoring the proportion of different TLR-expressing Th17 subtypes. This type of investigation needs to be conducted in a higher number of patients because, if confirmed, these data can help in the development of new therapies for NMOSD. As Doenças do Espectro da Neuromielite Óptica (NMOSD, do inglês neuromyelitis optica spectrum disorders ) são um conjunto de doenças autoimunes, inflamatórias, idiopáticas, do sistema nervoso central que, diferente da Esclerose Múltipla, cursam principalmente com episódios de neurite óptica e/ou mielite aguda. Apesar da suscetibilidade genética, o desenvolvimento e gravidade da NMOSD são influenciados por fatores ambientais, como produtos microbianos, que podem impactar o comportamento funcional das células T mais implicadas na NMOSD, o fenótipo Th17. Nesse sentido, o objetivo da presente tese foi analisar aspectos funcionais de células T CD4+ de pacientes com NMOSD em remissão, através da ativação in vitro com estímulos policlonais e microbianos, assim como determinar o padrão de expressão de receptores do tipo Toll (TLR) nessas células. Em nosso primeiro artigo, os resultados demonstraram uma alta resposta das células Th17 à E. coli, caracterizada pela produção de altos níveis de IL-17 e IL-6 nos pacientes. De forma interessante, os níveis dessas citocinas foram diretamente associados à gravidade da doença, determinada pela escala expandida do estado de incapacidade (EDSS), do inglês Expanded Disability Status Scale ), e à produção de IL-6 e IL-23 por monócitos ativados pelo lipopolissacarídeo (LPS) de E. coli. O papel da IL-6 como citocina envolvida na patogênese da NMOSD foi sugerido em nosso segundo artigo que mostrou que a inibição da sinalização via receptor da IL-6 reduziu a produção das citocinas relacionadas ao fenótipo Th17, aumentou a produção de IL-10 e a capacidade do corticoide em controlar a ativação dessas células in vitro. Como elevados níveis de LPS foram detectados nos plasmas dos pacientes com NMOSD, e estes foram positivamente correlacionados com a escala do EDSS, nosso último objetivo, foi avaliar a expressão de TLR nas células T CD4+ desses pacientes. Nossos resultados, demonstraram elevada percentagem de células T CD4+ expressando TLR2, 4 e 9 nos pacientes, quando comparado a indivíduos saudáveis. Ademais, a percentagem de células capazes de produzir simultaneamente IL-17 e IL-6 foi associada aos níveis plasmáticos de CD14 solúvel (sCD14) e à gravidade da NMOSD. Por outro lado, células Th17 TLR+ secretoras de IL-10 correlacionaram inversamente com os níveis de sCD14 e com o EDSS. Em conjunto, nossos resultados sugerem que produtos microbianos podem influenciar o prognóstico da NMOSD por favorecer diferentes subtipos de células Th17 TLR-positivas. Esse tipo de investigação precisa ser conduzido em um número maior de pacientes, pois, se confirmado, esses dados podem ajudar no desenho de novas terapias para a NMOSD.
- Published
- 2017
28. Effects of paradoxical sleep deprivation in rat inflammatory response and evaluation of ATL-1 of the antinociceptive effect, a synthetic analogue of 15-epi-lipoxins
- Author
-
Skinner, Gabriela Oliveira, Fierro, Iolanda Margherita, Almeida, Olga Maria Martins Silva de, Benjamim, Claudia Farias, Rocha, Mônica Santos, Sabino, Kátia Costa de Carvalho, and Fidalgo, Thereza Christina Barja
- Subjects
Lipoxins ,Sono Privação ,Resposta inflamatória ,Inflamação Aspectos imunológicos ,Inflammatory response ,Pain ,Dor ,Lipoxinas ,Privação de sono paradoxal ,Paradoxical sleep deprivation ,Hiperalgesia ,CIENCIAS BIOLOGICAS::FARMACOLOGIA::NEUROPSICOFARMACOLOGIA [CNPQ] - Abstract
Submitted by Boris INFORMAT (boris@uerj.br) on 2021-04-26T01:11:16Z No. of bitstreams: 1 Gabriela de Oliveira Skinner Tese completa.pdf: 3282538 bytes, checksum: 0ddb374465f87f673d3f384796c7af30 (MD5) Made available in DSpace on 2021-04-26T01:11:16Z (GMT). No. of bitstreams: 1 Gabriela de Oliveira Skinner Tese completa.pdf: 3282538 bytes, checksum: 0ddb374465f87f673d3f384796c7af30 (MD5) Previous issue date: 2012-03-28 Conselho Nacional de Desenvolvimento Científico e Tecnológico Sleep and immunity show a reciprocal relationship. Immune system activation alters sleep pattern and sleep disturbances can affect immune function. Moreover, it is well known that paradoxical sleep deprivation (PSD) leads to hyperalgesia and the treatment with classical drugs like opioids or tricyclic antidepressants is not able to reverse this hyperalgesia. In this work we investigated whether PSD could affect inflammatory response and survival in rats and if ATL-1 treatment would be able to reverse the hyperalgesia induced by PSD. All experimental protocols were previously approved by The Animal Care Ethical Committee of UERJ (CEUA/032/2010). Male Wistar rats were submitted to 96 h of PSD by single platform or modified multiple platforms methods. After 96 h of PSD animals were submitted to carrageenan-induced air pouch or pleurisy, or PSD was induced prior or after cecal ligation and puncture model (CLP). Animals presented an increase in leukocyte recruitment to the pouch cavity 4 h after carrageenan injection, however there was no difference between PSD and controls. The number of plasma leukocyte did not change after carrageenan injection. PSD animals submitted to pleurisy showed an increase in IL-6, IL-1β e TNF-α plasma levels, while IL-1β and IL-6 were increased in pleural exsudate of animals that received carrageenan. Leukocyte recruitment pattern to the site of injury was similar between controls and PSD 2 h, 4 h and 24 h after carrageenan injection. There was a progressive increase with time, reaching the maximum point at 24 h, but no differences were observed in PSD groups. PSD induced prior or after CLP decreased animals survival, however no difference was observed on neutrophil accumulation in both protocols. When PSD was induced prior CLP, IL-6 plasma levels were increased in PSD e PSDCLP groups, when PSD was induced after CLP, IL-6 and IL-1β plasma levels were increased in PSDCLP group. The effect of ATL-1 treatment (10 µg/kg, i.v.) on hyperalgesia induced by PSD was determined through formalin test. The treatment reduced the number of pain related behaviors in PSD animals and controls on inflammatory phase. Our results show that ATL-1 was able to revert the hyperalgesia induced by PSD possibly through its anti-inflammatory action. Furthermore, PSD for 96 h increased cytokine plasma levels and reduced survival, however it was not able to modify leukocyte recruitment when challenged by an inflammatory or infectious stimulus. However the inflammatory mediators increase observed in PSD animals could be related to hyperalgesia since treatment with ATL-1 reverted this effect, possibly through anti-inflammatory mechanisms. Sono e imunidade parecem apresentar uma relação de reciprocidade. A ativação do sistema imune altera o padrão de sono e distúrbios do sono podem afetar a função imune. Além disso, é bem descrito que a privação de sono paradoxal (PSP) leva à hiperalgesia e o tratamento com fármacos clássicos, como opióides ou antidepressivos tricíclicos, não é capaz de reverter este quadro. Neste trabalho, avaliamos se a PSP afetaria a resposta inflamatória e a sobrevida em ratos e se o tratamento com um análogo sintético de lipoxinas (ATL-1) seria capaz de reverter a hiperalgesia induzida pela PSP. Todos os protocolos experimentais foram previamente aprovados pelo Comitê de Ética para o Uso de Animais, da UERJ (CEUA/032/2010). Ratos Wistar machos foram submetidos a 96 h de PSP, induzidas pelo método de plataforma única (PU) ou de múltiplas plataformas modificado (MPM). Após 96 h de PSP os animais foram submetidos ao modelo da bolha de ar ou pleurisia utilizando-se a carragenina como agente flogístico, ou ainda a PSP foi aplicada antes ou após a indução de um modelo de ligação e perfuração do ceco (CLP). Quatro horas após a injeção de carragenina os animais apresentaram um aumento no recrutamento de leucócitos para a cavidade da bolha, porém não houve diferença entre animais PSP e controles. O número total de leucócitos no plasma não se alterou após a injeção de carragenina. Na pleurisia, os animais PSP apresentaram um aumento nos níveis de IL-6, IL-1β e TNF-α no plasma, enquanto apenas IL-1β e IL-6 estavam aumentados no exsudato pleural dos animais que receberam carragenina. O padrão de recrutamento de leucócitos para o local da injúria foi bastante semelhante entre os animais controle e PSP 2 h, 4 h e 24 h após a injeção de carragenina. Houve um aumento progressivo com o tempo, apresentando um pico em 24 h, no entanto, não foi observada diferença significativa na resposta dos grupos PSP. A PSP aplicada antes ou após a indução do CLP reduziu a sobrevida dos animais, mas não alterou o acúmulo de neutrófilos, nos dois protocolos. Quando a PSP foi aplicada antes do CLP, os níveis séricos de IL-6 estavam aumentados nos grupos PSP e PSPCLP, porém quando a PSP foi aplicada após o CLP, ambas IL-6 e IL-1β estavam aumentadas nos grupo PSPCLP. O efeito do tratamento com ATL-1 (10 µg/kg, i.v.) na hiperalgesia induzida pela PSP foi determinado através do teste da formalina. O análogo reduziu o número de comportamentos relacionados à dor em animais PSP e controles na fase inflamatória do teste. Nossos resultados demonstraram que a PSP por 96 h aumentou os níveis plasmáticos de citocinas, reduziu a sobrevida dos animais, contudo não foi capaz de alterar o recrutamento de leucócitos frente a um estímulo inflamatório ou infeccioso. O aumento de mediadores inflamatórios observado nesses animais pode estar relacionado à hiperalgesia em animais PSP, uma vez que o tratamento com o ATL-1 reverteu esse efeito, possivelmente através de mecanismos envolvendo sua ação anti-inflamatória.
- Published
- 2012
29. Maternal protein deprivation during lactation increases leptin activity and inhibits apoptosis of thymic cells from young offspring
- Author
-
Rodrigues, Carolina Salama, Fidalgo, Thereza Christina Barja, Silva, Simone Vargas da, Silva, Patrícia Cristina Lisbôa da, Benjamim, Claudia Farias, and Savino, Wilson
- Subjects
Leptin ,Thymocytes ,Leptina ,Apoptose ,Metabolic programming ,Timócitos ,Undernutrition ,Apoptosis ,Programação metabólica ,Desnutrição ,CIENCIAS BIOLOGICAS::BIOQUIMICA [CNPQ] - Abstract
Submitted by Boris INFORMAT (boris@uerj.br) on 2021-04-26T01:15:11Z No. of bitstreams: 1 Carolina Salama Rodrigues Dissertacao completa.pdf: 2367871 bytes, checksum: c2f0414b5a271a6c51702f2d3d88580e (MD5) Made available in DSpace on 2021-04-26T01:15:11Z (GMT). No. of bitstreams: 1 Carolina Salama Rodrigues Dissertacao completa.pdf: 2367871 bytes, checksum: c2f0414b5a271a6c51702f2d3d88580e (MD5) Previous issue date: 2011-03-16 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior In this study, we investigated the consequences of maternal protein deprivation during lactation on thymocyte responses of the offspring Wistar rats (PD group) and the role of leptin in these alterations. Compared to group C, PD animals showed at 30 days of age, lower body and thymus weights, with no alteration in the thymocyte number or any difference in the profile of T cell subsets, or in their proliferative response. Similar circulating levels of corticosterone and GR nuclear contents were detected in thymic cells of PD or control groups. In contrast, despite the rats from PD group did not present alterations in leptin circulating levels, the expression of leptin receptor ObRb was enhanced in their thymocytes. This change was accompanied by an amplification in leptin signaling response of thymocytes from PD rats, which showed an increase in JAK2 and STAT3 phosphorylation after stimulation with leptin. Moreover, the thymic cells from PD rats presented a decreased rate of spontaneous apoptosis when compared to controls. Accordingly, higher expression of both the anti-apoptotic protein Bcl-2 and Procaspase-3 and lower expression of pro-apoptotic protein Bax were detected in PD thymocytes, however, the pro-apoptotic protein bad expression was similar between the groups. Thymocytes from PD group also exhibited a constitutive higher nuclear content of p65 NFkB associated to a lower IkB content in the cytoplasm. Finally, although there was no change in db genic (leptin receptor) expression in PD thymocytes, a higher expression of mRNA for ob gene (leptin) was observed in the thymic microenvironment from PD animals. Taken together, the results show that maternal protein deprivation during lactation affects thymic homeostasis, inducing leptin activity, which protect thymocytes from apoptosis in young progeny and, perhaps,may prone these animals for alterations in immune response in adult life. Neste estudo investigamos as consequências da restrição protéica materna durante a lactação sobre a resposta de timócitos da prole jovem de ratos Wistar (grupo D), identificando o papel da leptina nas alterações encontradas. Observamos que, quando comparados ao grupo controle, os animais do grupo D apresentaram, aos 30 dias de vida, uma diminuição significativa tanto do peso corporal quanto do timo. Contudo, não observamos alterações no número de timócitos, no perfil de células CD4/CD8 ou na resposta proliferativa destas células. Sistemicamente, o grupo D não apresentou alterações nos níveis séricos de corticosterona ou no conteúdo nuclear do seu receptor (GR) em timócitos. Apesar dos animais D não apresentarem alterações nos níveis circulantes de leptina, a expressão do seu receptor, ObRb, estava aumentada nos timócitos. Esta alteração foi acompanhada pela amplificação da resposta de sinalização da leptina nestas células, observada por um aumento na ativação de JAK2 e STAT3 após a incubação com leptina. Os timócitos isolados do grupo D apresentaram uma diminuição significativa na taxa de apoptose espontânea quando comparados ao grupo controle. Corroborando estes resultados, demonstramos que os timócitos dos animais D apresentam um aumento na expressão da proteína antiapoptótica Bcl-2 e uma redução da expressão da proteína próapoptótica Bax, além de um maior conteúdo de Pró-caspase-3, entretanto, não encontramos alterações no conteúdo de Bad. Além disso, timócitos do grupo D apresentaram um maior conteúdo da subunidade p65 do NFĸB no núcleo, associado a uma menor expressão de IĸBα no citoplasma. Finalmente, observamos um aumento na expressão do RNAm para o gene ob (leptina) mas não para o gene db (receptor) no microambiente tímico dos animais D. Em conjunto, nossos dados mostram que a restrição protéica durante a lactação afeta a homeostase tímica, induzindo uma maior atividade de leptina, que protege os timócitos da apoptose na prole jovem, sugerindo que esses animais poderiam ser mais suscetíveis a alterações na resposta imune na vida aduta.
- Published
- 2011
30. Modulation of monocytes activation by lipoxins
- Author
-
Fé, Amanda Regina da, Fierro, Iolanda Margherita, Freitas-almeida, Angela Corrêa de, Benjamim, Claudia Farias, and Thomazzi, Sara Maria
- Subjects
Heme oxygenase ,Monócitos ,CIENCIAS BIOLOGICAS::FARMACOLOGIA::FARMACOLOGIA BIOQUIMICA E MOLECULAR [CNPQ] ,Lipoxinas ,Heme-oxigenase ,Monocytes ,Lipoxin - Abstract
Submitted by Boris INFORMAT (boris@uerj.br) on 2021-04-26T01:15:19Z No. of bitstreams: 1 Amanada Regina da Fe Dissertacao completa.pdf: 765881 bytes, checksum: a684ccc037c33226f4c427888f2b23a3 (MD5) Made available in DSpace on 2021-04-26T01:15:19Z (GMT). No. of bitstreams: 1 Amanada Regina da Fe Dissertacao completa.pdf: 765881 bytes, checksum: a684ccc037c33226f4c427888f2b23a3 (MD5) Previous issue date: 2009-03-05 Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro Lipoxins (LXs) are arachidonic acid metabolites with well recognized anti-inflammatory and pro-resolution activities. Despite the large number of studies describing the role of LXs and their analogs in leukocytes and other cell types involved in inflammatory diseases, little is known about the mechanisms of action that trigger these responses. This work investigated the role of 15-epi-16-(para-fluoro)-phenoxy-lipoxin A4 (ATL-1), a synthetic analog of 15-epi-lipoxin A4 on various processes of monocyte activation. We characterized, for the first time, the lipoxin A4 receptor (ALX) in the monocytic lineage U937, through the assessment of its gene expression and protein and its functionality through the activation of ERK-2, which makes this cell line a suitable tool to study the mechanisms of action of LXs and their analogs on the monocytes. Furthermore, we demonstrated that ATL-1 increases the expression of the enzyme heme oxygenase (HO)-1 in the U937 cells via activation of p38 MAP kinase (MAPK) and decreases the secretion of Monocyte chemoattractant protein-1 (MCP-1), a chemokine involved in the recruitment of monocytes to the inflammatory focus in LPS-stimulated U937 cells. MCP-1 secretion inhibition by ATL-1 was reverted by SB203580 indicating that this effect is dependent on the activation of p38 MAPK pathway. This study clarifies some of the mechanisms involved in the activation of monocytes by lipoxins which may lead to new approaches for the control of different pathologies where the inflammatory component is relevant Lipoxinas (LXs) são metabólitos do ácido araquidônico com reconhecidas atividades antiinflamatórias e pró-resolução. Apesar do grande número de trabalhos publicados descrevendo o papel das LXs e seus análogos em leucócitos e outros tipos celulares envolvidos em doenças inflamatórias, pouco é sabido a respeito dos mecanismos de ação que desencadeiam estas respostas. Neste trabalho investigamos o papel do 15-epi-16-(para-flúor)-fenoxi-lipoxina A4 (ATL-1), um análogo sintético da 15-epi-lipoxina A4, sobre diversos processos de ativação de monócitos. Caracterizamos, pela primeira vez, o receptor da lipoxina A4 (ALX) na linhagem monocítica U937, através da avaliação de sua expressão gênica e protéica e de sua funcionalidade analisando a ativação de ERK-2, o que torna esta célula uma ferramenta apta para estudo dos mecanismos de ação das LXs e seus análogos sobre os monócitos. Além disso, demonstramos que o ATL-1 aumenta a expressão da enzima heme oxigenase (HO) -1 em células U937 via ativação da p38 MAP quinase (MAPK) e diminui a secreção da Monocyte chemoattractant protein-1 (MCP-1), uma quimiocina envolvida com o recrutamento de monócitos para o foco inflamatório, em células U937 estimuladas com LPS. A inibição da secreção de MCP-1 foi revertida pela utilização do SB203580, sugerindo que este efeito é dependente da ativação da via p38 MAPK. O presente estudo elucida alguns dos mecanismos envolvidos na ativação de monócitos pelas lipoxinas que podem levar a novas abordagens para o controle de diversas doenças nas quais o componente inflamatório é importante
- Published
- 2009
31. Adenosine Diphosphate Improves Wound Healing in Diabetic Mice Through P2Y 12 Receptor Activation.
- Author
-
Borges PA, Waclawiak I, Georgii JL, Fraga-Junior VDS, Barros JF, Lemos FS, Russo-Abrahão T, Saraiva EM, Takiya CM, Coutinho-Silva R, Penido C, Mermelstein C, Meyer-Fernandes JR, Canto FB, Neves JS, Melo PA, Canetti C, and Benjamim CF
- Subjects
- Adenosine Diphosphate therapeutic use, Administration, Cutaneous, Alloxan administration & dosage, Alloxan toxicity, Animals, Diabetes Mellitus, Experimental chemically induced, Humans, Male, Mice, Purinergic P2Y Receptor Agonists therapeutic use, Skin drug effects, Skin injuries, Skin pathology, Adenosine Diphosphate pharmacology, Diabetes Mellitus, Experimental complications, Purinergic P2Y Receptor Agonists pharmacology, Receptors, Purinergic P2Y12 metabolism, Wound Healing drug effects
- Abstract
Chronic wounds are a public health problem worldwide, especially those related to diabetes. Besides being an enormous burden to patients, it challenges wound care professionals and causes a great financial cost to health system. Considering the absence of effective treatments for chronic wounds, our aim was to better understand the pathophysiology of tissue repair in diabetes in order to find alternative strategies to accelerate wound healing. Nucleotides have been described as extracellular signaling molecules in different inflammatory processes, including tissue repair. Adenosine-5'-diphosphate (ADP) plays important roles in vascular and cellular response and is immediately released after tissue injury, mainly from platelets. However, despite the well described effect on platelet aggregation during inflammation and injury, little is known about the role of ADP on the multiple steps of tissue repair, particularly in skin wounds. Therefore, we used the full-thickness excisional wound model to evaluate the effect of local ADP application in wounds of diabetic mice. ADP accelerated cutaneous wound healing, improved new tissue formation, and increased both collagen deposition and transforming growth factor-β (TGF-β) production in the wound. These effects were mediated by P2Y
12 receptor activation since they were inhibited by Clopidogrel (Clop) treatment, a P2Y12 receptor antagonist. Furthermore, P2Y1 receptor antagonist also blocked ADP-induced wound closure until day 7, suggesting its involvement early in repair process. Interestingly, ADP treatment increased the expression of P2Y12 and P2Y1 receptors in the wound. In parallel, ADP reduced reactive oxygen species (ROS) formation and tumor necrosis factor-α (TNF-α) levels, while increased IL-13 levels in the skin. Also, ADP increased the counts of neutrophils, eosinophils, mast cells, and gamma delta (γδ) T cells (Vγ4+ and Vγ5+ cells subtypes of γδ+ T cells), although reduced regulatory T (Tregs) cells in the lesion. In accordance, ADP increased fibroblast proliferation and migration, myofibroblast differentiation, and keratinocyte proliferation. In conclusion, we provide strong evidence that ADP acts as a pro-resolution mediator in diabetes-associated skin wounds and is a promising intervention target for this worldwide problem., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2021 Borges, Waclawiak, Georgii, Fraga-Junior, Barros, Lemos, Russo-Abrahão, Saraiva, Takiya, Coutinho-Silva, Penido, Mermelstein, Meyer-Fernandes, Canto, Neves, Melo, Canetti and Benjamim.)- Published
- 2021
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.