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  1. Article ; Online: Tezepelumab: una nueva opción para el tratamiento del asma grave.

    Maldonado-Ríos, Valente Armando / Ardila-Herrera, Juan Camilo / Galicia-Sánchez, Luz María / Celis-Preciado, Carlos Andrés

    Revista medica del Instituto Mexicano del Seguro Social

    2023  Volume 61, Issue 6, Page(s) 841–848

    Abstract: In Latin America, asthma is a public health problem with a significant impact on both patients and health systems. The greater understanding of the pathophysiology and the recognition of the central role that inflammation has in the severity of asthma ... ...

    Title translation Tezepelumab: a new option for the treatment of severe asthma.
    Abstract In Latin America, asthma is a public health problem with a significant impact on both patients and health systems. The greater understanding of the pathophysiology and the recognition of the central role that inflammation has in the severity of asthma has favored the development of monoclonal antibodies that have IL-5, IL-4, IL-13 and IgE as therapeutic targets. Although these therapeutic alternatives promote better control of the disease, not all patients respond favorably to these treatments. Therefore, it is of particular interest to explore monoclonal antibodies such as Tezepelumab, directed against thymic stromal lymphopoietin (TSLP), an alarmin (epithelial cytokine) that participates in the initiation and perpetuation of inflammation in Asthma. Therefore, in this review, we will show the clinical efficacy of tezepelumab in reducing the annual rate of exacerbations, improving lung function, and reducing bronchial hyperreactivity, regardless of the patient's baseline biomarker levels. Therefore, this new molecule is a highly effective therapeutic option for patients with severe asthma.
    MeSH term(s) Humans ; Asthma/drug therapy ; Antibodies, Monoclonal, Humanized/therapeutic use ; Cytokines/therapeutic use ; Antibodies, Monoclonal/therapeutic use ; Inflammation
    Chemical Substances tezepelumab (RJ1IW3B4QX) ; Antibodies, Monoclonal, Humanized ; Cytokines ; Antibodies, Monoclonal
    Language Spanish
    Publishing date 2023-11-06
    Publishing country Mexico
    Document type English Abstract ; Journal Article ; Review
    ZDB-ID 732133-8
    ISSN 2448-5667 ; 0443-5117 ; 0484-7849
    ISSN (online) 2448-5667
    ISSN 0443-5117 ; 0484-7849
    DOI 10.5281/zenodo.10064422
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Repositioning of pentoxifylline as an immunomodulator and regulator of the renin-angiotensin system in the treatment of COVID-19.

    Maldonado, Valente / Loza-Mejía, Marco A / Chávez-Alderete, Jaime

    Medical hypotheses

    2020  Volume 144, Page(s) 109988

    Abstract: Pentoxifylline (PTX) is a phosphodiesterase inhibitor that increases cyclic adenosine monophosphate levels, which in turn activate protein kinase, leading to a reduction in the synthesis of proinflammatory cytokines to ultimately influence the renin- ... ...

    Abstract Pentoxifylline (PTX) is a phosphodiesterase inhibitor that increases cyclic adenosine monophosphate levels, which in turn activate protein kinase, leading to a reduction in the synthesis of proinflammatory cytokines to ultimately influence the renin-angiotensin system (RAS) in vitro by inhibiting angiotensin 1 receptor (AT1R) expression. The rheological, anti-inflammatory, and renin-angiotensin axis properties of PTX highlight this drug as a therapeutic treatment alternative for patients with COVID-19 by helping reduce the production of the inflammatory cytokines without deleterious effects on the immune system to delay viral clearance. Moreover, PTX can restore the balance of the immune response, reduce damage to the endothelium and alveolar epithelial cells, improve circulation, and prevent microvascular thrombosis. There is further evidence that PTX can improve ventilatory parameters. Therefore, we propose repositioning PTX in the treatment of COVID-19. The main advantage of repositioning PTX is that it is an affordable drug that is already available worldwide with an established safety profile, further offering the possibility of immediately analysing the result of its use and associated success rates. Another advantage is that PTX selectively reduces the concentration of TNF-α mRNA in cells, which, in the case of an acute infectious state such as COVID-19, would seem to offer a more strategic approach.
    MeSH term(s) Alveolar Epithelial Cells/drug effects ; Angiotensin II/physiology ; Angiotensin-Converting Enzyme 2/metabolism ; Animals ; COVID-19/epidemiology ; COVID-19/immunology ; COVID-19/physiopathology ; Complement Activation/drug effects ; Cytokines/biosynthesis ; Cytokines/genetics ; Disease Models, Animal ; Drug Repositioning ; Endothelial Cells/drug effects ; Gene Expression Regulation/drug effects ; Humans ; Immunologic Factors/pharmacology ; Immunologic Factors/therapeutic use ; Inflammation ; Lymphocyte Subsets/drug effects ; Microcirculation/drug effects ; Oxidative Stress ; Pandemics ; Pentoxifylline/pharmacology ; Pentoxifylline/therapeutic use ; Rats ; Receptors, Virus/metabolism ; Renin-Angiotensin System/drug effects ; Renin-Angiotensin System/physiology ; SARS-CoV-2/physiology ; Signal Transduction/drug effects ; Venous Thromboembolism/etiology ; Venous Thromboembolism/prevention & control ; COVID-19 Drug Treatment
    Chemical Substances Cytokines ; Immunologic Factors ; Receptors, Virus ; Angiotensin II (11128-99-7) ; ACE2 protein, human (EC 3.4.17.23) ; Angiotensin-Converting Enzyme 2 (EC 3.4.17.23) ; Pentoxifylline (SD6QCT3TSU)
    Keywords covid19
    Language English
    Publishing date 2020-06-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 193145-3
    ISSN 1532-2777 ; 0306-9877
    ISSN (online) 1532-2777
    ISSN 0306-9877
    DOI 10.1016/j.mehy.2020.109988
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Repositioning of pentoxifylline as an immunomodulator and regulator of the renin-angiotensin system in the treatment of COVID-19

    Maldonado, Valente / Loza-Mejía, Marco A. / Chávez-Alderete, Jaime

    Medical Hypotheses

    2020  Volume 144, Page(s) 109988

    Keywords General Medicine ; covid19
    Language English
    Publisher Elsevier BV
    Publishing country us
    Document type Article ; Online
    ZDB-ID 193145-3
    ISSN 1532-2777 ; 0306-9877
    ISSN (online) 1532-2777
    ISSN 0306-9877
    DOI 10.1016/j.mehy.2020.109988
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Could biological tissue preservation methods change chemical elements proportion measured by energy dispersive X-ray spectroscopy?

    Ladeira, Luiz Carlos Maia / Dos Santos, Eliziária Cardoso / Valente, Gilmar Edilberto / da Silva, Janaina / Santos, Talita Amorim / Dos Santos Costa Maldonado, Izabel Regina

    Biological trace element research

    2019  Volume 196, Issue 1, Page(s) 168–172

    Abstract: Energy dispersive X-ray spectroscopy (EDS) is a powerful technical tool used in the biomedical field to investigate the proportion of chemical elements of interest in research, such as heavy metal bioaccumulation and the enzymatic cofactors and ... ...

    Abstract Energy dispersive X-ray spectroscopy (EDS) is a powerful technical tool used in the biomedical field to investigate the proportion of chemical elements of interest in research, such as heavy metal bioaccumulation and the enzymatic cofactors and nanoparticle therapy in various pathologies. However, the correct evaluation of the proportion of the elements is subject to some factors, including the method of sample preservation. In this study, we seek to investigate the effect of biological tissue preservation methods on the proportion of chemical elements obtained by the EDS methodology. For such, we used EDS to measure the proportion of chemical elements with biomedical interest in preserved livers, using three common methods for preserving biological tissues: (a) freezing, (b) paraformaldehyde fixative solution, and (c) Karnovsky solution. We found an increased level of sodium and reduced contents of potassium and copper in samples fixed in fixative solutions, when compared to frozen samples (p < 0.05). Our data indicate that preservation methods can change the proportion of chemical elements in biological samples, when measured by EDS. Frozen preservation should be preferred to retain the actual chemical content of samples and allow a correct assessment of the proportion of their elements.
    MeSH term(s) Animals ; Liver/chemistry ; Male ; Metals, Alkali/analysis ; Metals, Alkaline Earth/analysis ; Metals, Heavy/analysis ; Mice ; Spectrometry, X-Ray Emission ; Tissue Preservation
    Chemical Substances Metals, Alkali ; Metals, Alkaline Earth ; Metals, Heavy
    Language English
    Publishing date 2019-10-25
    Publishing country United States
    Document type Journal Article
    ZDB-ID 445336-0
    ISSN 1559-0720 ; 0163-4984
    ISSN (online) 1559-0720
    ISSN 0163-4984
    DOI 10.1007/s12011-019-01909-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Repositioning of pentoxifylline as an immunomodulator and regulator of the renin-angiotensin system in the treatment of COVID-19

    Maldonado, Valente / Loza-Mejía, Marco A / Chávez-Alderete, Jaime

    Med Hypotheses

    Abstract: Pentoxifylline (PTX) is a phosphodiesterase inhibitor that increases cyclic adenosine monophosphate levels, which in turn activate protein kinase, leading to a reduction in the synthesis of proinflammatory cytokines to ultimately influence the renin- ... ...

    Abstract Pentoxifylline (PTX) is a phosphodiesterase inhibitor that increases cyclic adenosine monophosphate levels, which in turn activate protein kinase, leading to a reduction in the synthesis of proinflammatory cytokines to ultimately influence the renin-angiotensin system (RAS) in vitro by inhibiting angiotensin 1 receptor (AT1R) expression. The rheological, anti-inflammatory, and renin-angiotensin axis properties of PTX highlight this drug as a therapeutic treatment alternative for patients with COVID-19 by helping reduce the production of the inflammatory cytokines without deleterious effects on the immune system to delay viral clearance. Moreover, PTX can restore the balance of the immune response, reduce damage to the endothelium and alveolar epithelial cells, improve circulation, and prevent microvascular thrombosis. There is further evidence that PTX can improve ventilatory parameters. Therefore, we propose repositioning PTX in the treatment of COVID-19. The main advantage of repositioning PTX is that it is an affordable drug that is already available worldwide with an established safety profile, further offering the possibility of immediately analysing the result of its use and associated success rates. Another advantage is that PTX selectively reduces the concentration of TNF-α mRNA in cells, which, in the case of an acute infectious state such as COVID-19, would seem to offer a more strategic approach.
    Keywords covid19
    Publisher WHO
    Document type Article
    Note WHO #Covidence: #591493
    Database COVID19

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  6. Article ; Online: Fibrinolytic Activity of Circulating Microvesicles Is Associated with Progression of Breast Cancer.

    Valente-Acosta, Benjamín / Flores-García, Mirthala / González-Zárate, Georgina / Gerson-Cwilich, Raquel / Maldonado-Méndez, Marai / Juárez-Vega, Guillermo / Anglés-Cano, Eduardo / Peña-Díaz, Aurora de la

    The Tohoku journal of experimental medicine

    2020  Volume 250, Issue 2, Page(s) 121–128

    Abstract: The fibrinolytic system plays an important role in breast cancer, favoring progression through extracellular-matrix degradation, angiogenesis, apoptosis and cellular proliferation. The expression of urokinase-type plasminogen activator (uPA) in breast ... ...

    Abstract The fibrinolytic system plays an important role in breast cancer, favoring progression through extracellular-matrix degradation, angiogenesis, apoptosis and cellular proliferation. The expression of urokinase-type plasminogen activator (uPA) in breast cancer tissue is widely recognized as an unfavorable prognostic factor. However, fibrinolytic activity associated with uPA cannot be reliably measured in the blood because of the rapid inhibition of uPA by plasminogen activator inhibitor-1 (PAI-1). By contrast, circulating microvesicles (Mvs) in peripheral blood protect bound enzymes from inhibition. Mvs are extracellular vesicles, released from various types of cells, and their size fluctuates between 100 and 1,000 nm. Mvs carry DNA, RNA, miRNA, and proteins, thereby serving as a source of horizontal communication between cells. We investigated whether fibrinolytic activity on circulating Mvs reflects breast cancer progression. The study population consisted of 13 patients with breast cancer and 13 healthy women. The cancer patients included 4 patients in remission, 3 patients with locally advanced cancer, and 6 with metastatic disease. Mvs were isolated from peripheral blood, quantified by a protein concentration method, and their fibrinolytic potential was measured by their capacity to generate plasmin. Although the quantity of Mvs found in patients with cancer and healthy individuals was similar, plasmin generated on Mvs was twice the amount in patients with metastasis than in healthy women (P < 0.05), underlying the value of this distinctive parameter. The data suggest that in breast cancer patients, higher fibrinolytic activity of circulating Mvs could be related to progression and metastasis of breast cancer.
    MeSH term(s) Adult ; Breast Neoplasms/drug therapy ; Breast Neoplasms/metabolism ; Breast Neoplasms/pathology ; Cell-Derived Microparticles/metabolism ; Disease Progression ; Female ; Fibrinolysin/metabolism ; Fibrinolysis ; Fluorescence ; Humans ; Middle Aged ; Urokinase-Type Plasminogen Activator/metabolism
    Chemical Substances Fibrinolysin (EC 3.4.21.7) ; Urokinase-Type Plasminogen Activator (EC 3.4.21.73)
    Language English
    Publishing date 2020-02-27
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 123477-8
    ISSN 1349-3329 ; 0040-8727
    ISSN (online) 1349-3329
    ISSN 0040-8727
    DOI 10.1620/tjem.250.121
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Necrotic carpal tunnel syndrome in a child.

    Maldonado García, César / Valente Duarte de Sousa, Isabel Cristina / López Cepeda, Larissa

    Pediatric dermatology

    2014  Volume 31, Issue 4, Page(s) 500–503

    Abstract: Median nerve entrapment at the wrist level causes carpal tunnel syndrome (CTS). Although frequent in adults, CTS is a rare entity in children. Bouvier described an exceptional necrotic variant in 1979 in which skin, nail, and bone lesions are typical. We ...

    Abstract Median nerve entrapment at the wrist level causes carpal tunnel syndrome (CTS). Although frequent in adults, CTS is a rare entity in children. Bouvier described an exceptional necrotic variant in 1979 in which skin, nail, and bone lesions are typical. We report the case of a 10-year-old child with necrotic CTS secondary to trauma. To our knowledge, this is the first case reported in a child.
    MeSH term(s) Carpal Tunnel Syndrome/diagnosis ; Carpal Tunnel Syndrome/etiology ; Carpal Tunnel Syndrome/surgery ; Child ; Decompression, Surgical ; Humans ; Male ; Necrosis ; Wounds and Injuries/complications
    Language English
    Publishing date 2014-07
    Publishing country United States
    Document type Case Reports ; Journal Article
    ZDB-ID 605539-4
    ISSN 1525-1470 ; 0736-8046
    ISSN (online) 1525-1470
    ISSN 0736-8046
    DOI 10.1111/pde.12066
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Reductions in disease activity in the AMPLE trial: clinical response by baseline disease duration.

    Schiff, Michael / Weinblatt, Michael E / Valente, Robert / Citera, Gustavo / Maldonado, Michael / Massarotti, Elena / Yazici, Yusuf / Fleischmann, Roy

    RMD open

    2016  Volume 2, Issue 1, Page(s) e000210

    Abstract: Objectives: To evaluate clinical response by baseline disease duration using 2-year data from the AMPLE trial.: Methods: Patients were randomised to subcutaneous abatacept 125 mg weekly or adalimumab 40 mg bi-weekly, with background methotrexate. As ... ...

    Abstract Objectives: To evaluate clinical response by baseline disease duration using 2-year data from the AMPLE trial.
    Methods: Patients were randomised to subcutaneous abatacept 125 mg weekly or adalimumab 40 mg bi-weekly, with background methotrexate. As part of a post hoc analysis, the achievement of validated definitions of remission (Clinical Disease Activity Index (CDAI) ≤2.8, Simplified Disease Activity Index (SDAI) ≤3.3, Routine Assessment of Patient Index Data 3 (RAPID3) ≤3.0, Boolean score ≤1), low disease activity (CDAI <10, SDAI <11, RAPID3 ≤6.0), Health Assessment Questionnaire-Disability Index response and American College of Rheumatology responses were evaluated by baseline disease duration (≤6 vs >6 months). Disease Activity Score 28 (C-reactive protein) <2.6 or ≤3.2 and radiographic non-progression in patients achieving remission were also evaluated.
    Results: A total of 646 patients were randomised and treated (abatacept, n=318; adalimumab, n=328). In both treatment groups, comparable responses were achieved in patients with early rheumatoid arthritis (≤6 months) and in those with later disease (>6 months) across multiple clinical measures.
    Conclusions: Abatacept or adalimumab with background methotrexate were associated with similar onset and sustainability of response over 2 years. Patients treated early or later in the disease course achieved comparable clinical responses.
    Trial registration number: NCT00929864, Post-results.
    Language English
    Publishing date 2016
    Publishing country England
    Document type Journal Article
    ZDB-ID 2812592-7
    ISSN 2056-5933
    ISSN 2056-5933
    DOI 10.1136/rmdopen-2015-000210
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Could biological tissue preservation methods change chemical elements proportion measured by energy dispersive X-ray spectroscopy?

    Ladeira, Luiz Carlos Maia / dos Santos, Eliziária Cardoso / Valente, Gilmar Edilberto / da Silva, Janaina / Santos, Talita Amorim / dos Santos Costa Maldonado, Izabel Regina

    Biological trace element research. 2020 July, v. 196, no. 1

    2020  

    Abstract: Energy dispersive X-ray spectroscopy (EDS) is a powerful technical tool used in the biomedical field to investigate the proportion of chemical elements of interest in research, such as heavy metal bioaccumulation and the enzymatic cofactors and ... ...

    Abstract Energy dispersive X-ray spectroscopy (EDS) is a powerful technical tool used in the biomedical field to investigate the proportion of chemical elements of interest in research, such as heavy metal bioaccumulation and the enzymatic cofactors and nanoparticle therapy in various pathologies. However, the correct evaluation of the proportion of the elements is subject to some factors, including the method of sample preservation. In this study, we seek to investigate the effect of biological tissue preservation methods on the proportion of chemical elements obtained by the EDS methodology. For such, we used EDS to measure the proportion of chemical elements with biomedical interest in preserved livers, using three common methods for preserving biological tissues: (a) freezing, (b) paraformaldehyde fixative solution, and (c) Karnovsky solution. We found an increased level of sodium and reduced contents of potassium and copper in samples fixed in fixative solutions, when compared to frozen samples (p < 0.05). Our data indicate that preservation methods can change the proportion of chemical elements in biological samples, when measured by EDS. Frozen preservation should be preferred to retain the actual chemical content of samples and allow a correct assessment of the proportion of their elements.
    Keywords bioaccumulation ; copper ; energy-dispersive X-ray analysis ; freezing ; heavy metals ; liver ; nanoparticles ; potassium ; sodium ; therapeutics
    Language English
    Dates of publication 2020-07
    Size p. 168-172.
    Publishing place Springer US
    Document type Article
    ZDB-ID 445336-0
    ISSN 1559-0720 ; 0163-4984
    ISSN (online) 1559-0720
    ISSN 0163-4984
    DOI 10.1007/s12011-019-01909-x
    Database NAL-Catalogue (AGRICOLA)

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  10. Article ; Online: Pentoxifylline decreases serum LDH levels and increases lymphocyte count in COVID-19 patients: Results from an external pilot study.

    Maldonado, Valente / Hernandez-Ramírez, Claudia / Oliva-Pérez, Eniel Alonso / Sánchez-Martínez, César Omar / Pimentel-González, Jorge Fabián / Molina-Sánchez, José Raúl / Jiménez-Villalba, Yeimmy Zuyenn / Chávez-Alderete, Jaime / Loza-Mejía, Marco A

    International immunopharmacology

    2020  Volume 90, Page(s) 107209

    Abstract: We have previously hypothesized that pentoxifylline could be beneficial for the treatment of COVID-19 given its potential to restore the immune response equilibrium, reduce the impact of the disease on the endothelium and alveolar epithelial cells, and ... ...

    Abstract We have previously hypothesized that pentoxifylline could be beneficial for the treatment of COVID-19 given its potential to restore the immune response equilibrium, reduce the impact of the disease on the endothelium and alveolar epithelial cells, and improve the circulatory function.Serum lactate dehydrogenase (LDH) and lymphocyte count are accessible biomarkers that correlate with the severity of COVID-19, the need for hospitalization, and mortality, reflecting the host immune response's contribution to the seriousness of SARS-CoV-2 infection. We carried out this external pilot study on 38 patients with moderate and severe COVID-19 to test the effect pentoxifylline on parameters such as LDH, lymphocyte count, days of hospitalization, mortality, and proportion of patients requiring intubation. Twenty-six patients were randomized to receive 400 mg of pentoxifylline t.i.d. plus standard therapy (pentoxifylline group), while the rest received the standard treatment (control group). Linear regression models were built for statistically significant parameters. Pentoxifylline treatment was associated with a 64.25% increase (CI95% 11.83, 116.68) in lymphocyte count and a 29.61% decrease (CI95% 15.11, 44.10) in serum LDH. Although a trend towards reduced days of hospitalization, mortality, and proportion of patients requiring intubation was observed, no statistically significant difference was found for these parameters. Our findings open the possibility of pentoxifylline being repositioned as a drug for COVID-19 treatment with the advantages of a proven safety profile, availability, and no risk of immunosuppression; however, this evidence needs to be confirmed in a pragmatic randomized controlled trial.
    MeSH term(s) Aged ; Biomarkers/blood ; COVID-19/blood ; COVID-19/drug therapy ; COVID-19/immunology ; Drug Repositioning ; Female ; Humans ; L-Lactate Dehydrogenase/blood ; Lymphocyte Count ; Male ; Middle Aged ; Pentoxifylline/pharmacology ; Pentoxifylline/therapeutic use ; Pilot Projects ; SARS-CoV-2
    Chemical Substances Biomarkers ; L-Lactate Dehydrogenase (EC 1.1.1.27) ; Pentoxifylline (SD6QCT3TSU)
    Language English
    Publishing date 2020-11-26
    Publishing country Netherlands
    Document type Journal Article ; Randomized Controlled Trial
    ZDB-ID 2043785-7
    ISSN 1878-1705 ; 1567-5769
    ISSN (online) 1878-1705
    ISSN 1567-5769
    DOI 10.1016/j.intimp.2020.107209
    Database MEDical Literature Analysis and Retrieval System OnLINE

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