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Tavares IR, Caffaro RA, Portugal MF, Ribeiro CM, da Silva VS, Krupa E, Nikolovski S, de Britto KF, Gomes Pereira Petisco AC, Miranda MC, Gomes de Souza Santos S, da Silva Dourado M, Siqueira PV, Siddiqui F, Fareed J, Ramacciotti E. Biomarkers Profile in Provoked Versus Unprovoked Deep Venous Thrombosis. Clin Appl Thromb Hemost 2024; 30:10760296241238211. [PMID: 38566607 PMCID: PMC10989034 DOI: 10.1177/10760296241238211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2024] [Revised: 02/12/2024] [Accepted: 02/23/2024] [Indexed: 04/04/2024] Open
Abstract
Venous thromboembolism (VTE), including deep venous thrombosis (DVT) and pulmonary embolism (PE), represents a substantial healthcare challenge. Provoked and unprovoked DVT cases carry distinct risks and treatment considerations. Recognizing the limitations of this classification, molecular markers may enhance diagnostic precision and guide anticoagulation therapy duration relying on patient history and risk factors. This preliminary, open-label, prospective cohort study was conducted including 15 patients (10 provoked DVT and 5 unprovoked DVT) and a control group of healthy plasmatic subjects. Plasma levels of 9 biomarkers were measured at diagnosis (baseline, day 0, and D0) and after 30 days (day 30-D30). Patient demographics, clinical data, and biomarker concentrations were analyzed. Serum concentrations of D-dimer, von Willebrand factor, C-reactive protein, and Anti-Xa were elevated in DVT groups at D0 compared to controls. No significant differences were observed between the provoked and unprovoked groups on the day of diagnosis and 30 days later. Over 30 days, the provoked group exhibited significant biomarker changes related to temporal assessment. No significant differences were noted in the biomarker profile between provoked and unprovoked DVT groups. This study is indicative of the concept of individualized thrombosis assessment and subsequent treatment for VTE. Larger cohorts are warranted to validate these findings and further define the most appropriate use of the molecular markers.
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Affiliation(s)
- Isabela Rodrigues Tavares
- Department of Vascular Surgery, Santa Casa de São Paulo School of Medical Sciences, São Paulo, SP, Brazil
- Dante Pazzanese Cardiology Institute, São Paulo, SP, Brazil
| | - Roberto Augusto Caffaro
- Department of Vascular Surgery, Santa Casa de São Paulo School of Medical Sciences, São Paulo, SP, Brazil
| | | | | | | | - Emily Krupa
- Pathology Department, Hemostasis & Thrombosis Research Laboratories at Loyola University Medical Center, Maywood, IL, USA
| | - Srdjan Nikolovski
- Pathology Department, Hemostasis & Thrombosis Research Laboratories at Loyola University Medical Center, Maywood, IL, USA
| | - Karen Falcão de Britto
- Department of Vascular Surgery, Santa Casa de São Paulo School of Medical Sciences, São Paulo, SP, Brazil
| | | | | | | | | | | | - Fakiha Siddiqui
- Pathology Department, Hemostasis & Thrombosis Research Laboratories at Loyola University Medical Center, Maywood, IL, USA
- Program in Health Sciences. UCAM - Universidad Católica San Antonio de Murcia, Guadalupe, Murcia, Spain
| | - Jawed Fareed
- Pathology Department, Hemostasis & Thrombosis Research Laboratories at Loyola University Medical Center, Maywood, IL, USA
| | - Eduardo Ramacciotti
- Science Valley Research Institute, Santo André, São Paulo, Brazil
- Pathology Department, Hemostasis & Thrombosis Research Laboratories at Loyola University Medical Center, Maywood, IL, USA
- Department of Cardiovascular Medicine, Hospital e Maternidade Christóvão da Gama, Grupo DASA, Santo André, São Paulo, Brazil
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2
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Carvalho de Oliveira CC, Agati LB, Ribeiro CM, Resende Aguiar VC, Caffaro RA, da Silva Santos M, Alves Fernandes RR, Alberto da Silva Magliano C, Tafur A, Spyropoulos AC, Lopes RD, Fareed J, Ramacciotti E. Cost-effectiveness analysis of extended thromboprophylaxis with rivaroxaban versus no prophylaxis in high-risk patients after hospitalisation for COVID-19: an economic modelling study. Lancet Reg Health Am 2023; 24:100543. [PMID: 37366432 PMCID: PMC10288203 DOI: 10.1016/j.lana.2023.100543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 06/08/2023] [Accepted: 06/12/2023] [Indexed: 06/28/2023]
Abstract
Background In patients at high risk of thromboembolism who were discharged after hospitalisation due to COVID-19, thromboprophylaxis with rivaroxaban 10 mg/day for 35 days significantly improved clinical outcomes, reducing thrombotic events compared with no post-discharge anticoagulation. The present study aimed to estimate the cost-effectiveness of this anticoagulation strategy. Methods Using the database of the MICHELLE trial, we developed a decision tree to estimate the cost-effectiveness of thromboprophylaxis with rivaroxaban 10 mg/day for 35 days versus no thromboprophylaxis in high-risk post-discharge patients for COVID-19 through an incremental cost-effectiveness analysis. Findings 318 patients in 14 centres in Brazil were enrolled in the primary MICHELLE trial. The mean age was 57.1 years (SD 15.2), 127 (40%) were women, 191 (60%) were men, and the mean body-mass index was 29.7 kg/m2 (SD 5.6). Rivaroxaban 10 mg per day orally for 35 days after discharge decreased the risk of events defined by the primary efficacy outcome by 67% (relative risk 0.33, 95% CI 0.12-0.90; p = 0.03). The mean cost for thromboprophylaxis with rivaroxaban was $53.37/patient, and no prophylaxis was $34.22/patient, with an incremental cost difference of $19.15. The effectiveness means obtained in the intervention group was 0.1457, while in the control group was 0.1421, determining an incremental QALY difference of 0.0036. The estimated incremental cost-effectiveness ratio (ICER) was $5385.52/QALY. Interpretation Extended treatment with Rivaroxaban as thromboprophylaxis after hospital discharge for high-risk patients with COVID-19 is a cost-effective treatment option. Funding Modest funding was provided by Science Valley Research Institute, São Paulo, Brazil.
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Affiliation(s)
- Caroline Cândida Carvalho de Oliveira
- Science Valley Research Institute, Santo André, São Paulo, Brazil
- Hospital e Maternidade Christóvão da Gama, Grupo DASA, Santo André, São Paulo, Brazil
- Irmandade da Santa Casa de Misericórdia de São Paulo, São Paulo, Brazil
| | | | | | - Valéria Cristina Resende Aguiar
- Science Valley Research Institute, Santo André, São Paulo, Brazil
- Hospital e Maternidade Christóvão da Gama, Grupo DASA, Santo André, São Paulo, Brazil
| | | | | | | | | | - Alfonso Tafur
- Northshore University Health System, Evanston, IL, USA
| | - Alex C Spyropoulos
- Zucker School of Medicine at Hofstra/Northwell and the Feinstein Institutes for Medical Research, Manhasset, NY, USA
| | - Renato Delascio Lopes
- Duke Clinical Research Institute, Duke University School of Medicine, Durham, NC, USA
| | - Jawed Fareed
- Hemostasis & Thrombosis Research Laboratories at Loyola University Medical Center, Maywood, IL, USA
| | - Eduardo Ramacciotti
- Science Valley Research Institute, Santo André, São Paulo, Brazil
- Hospital e Maternidade Christóvão da Gama, Grupo DASA, Santo André, São Paulo, Brazil
- Hemostasis & Thrombosis Research Laboratories at Loyola University Medical Center, Maywood, IL, USA
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3
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Santos RB, Ribeiro CM, Grade D, Pagaimo F, Baptista AM. Accuracy and safety of 3D printed surgical guides combined with monitored guidewires for placement of cervicothoracic pedicle screws: Technical note. Neurochirurgie 2023; 69:101418. [PMID: 36750162 DOI: 10.1016/j.neuchi.2023.101418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 01/08/2023] [Accepted: 01/10/2023] [Indexed: 02/07/2023]
Abstract
Subaxial cervical pedicle screws provide rigid fixation, but their placement poses an important neurovascular injury risk. 3D printed guides have successfully been used to place pedicle screws, but experience in the subaxial cervical spine is limited. We present a case of cervicothoracic dissociation after a pathological fracture due to tumour involvement of the upper thoracic spine, causing paraparesis and intense pain. The cervicothoracic junction is of difficult visualization on fluoroscopy and the patients' severe instability made navigation unreliable. 3D printed individualized guidewire guides were used to help place canulated pedicle screws from C4 to T6. We successfully report the use of impedance guidewire monitoring to prevent pedicle violation and improve procedure safety.
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Affiliation(s)
- R B Santos
- Neurosurgery Department, Centro Hospitalar Vila Nova de Gaia/Espinho, Rua Conceição Fernandes s/n - 4434-502, V(a) Nova de Gaia, Portugal.
| | - C M Ribeiro
- Neurosurgery Department, Centro Hospitalar Vila Nova de Gaia/Espinho, Rua Conceição Fernandes s/n - 4434-502, V(a) Nova de Gaia, Portugal
| | - D Grade
- Neurosurgery Department, Centro Hospitalar Vila Nova de Gaia/Espinho, Rua Conceição Fernandes s/n - 4434-502, V(a) Nova de Gaia, Portugal
| | - F Pagaimo
- Pagaimo Medical, Largo Pereira dos Santos, 7, 3080-136, Figueira da Foz, Portugal
| | - A M Baptista
- Neurosurgery Department, Centro Hospitalar Vila Nova de Gaia/Espinho, Rua Conceição Fernandes s/n - 4434-502, V(a) Nova de Gaia, Portugal
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4
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Longo de Oliveira ALM, de Oliveira Pereira RF, Agati LB, Ribeiro CM, Kawamura Suguiura GY, Cioni CH, Bermudez M, Pirani MB, Caffaro RA, Castelli V, Resende Aguiar VC, Volpiani GG, Paschoa A, Scarlatelli Macedo AV, de Barros e Silva PGM, de Campos Guerra JC, Fareed J, Lopes RD, Ramacciotti E. Rivaroxaban Versus Enoxaparin for Thromboprophylaxis After major Gynecological Cancer Surgery: The VALERIA Trial : Venous thromboembolism prophyl Axis after gyneco Logical p Elvic cancer surgery with RIvaroxaban versus enox Aparin (VALERIA trial). Clin Appl Thromb Hemost 2022; 28:10760296221132556. [PMID: 36474344 PMCID: PMC9732794 DOI: 10.1177/10760296221132556] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Direct oral anticoagulants (DOACs) for venous thromboembolism (VTE) prevention after major gynecological cancer surgery might be an alternative to parenteral low-molecular-weight heparin (LMWH). Patients undergoing major gynecological cancer surgery were randomized at hospital discharge to receive rivaroxaban 10 mg once daily or enoxaparin 40 mg once daily for 30 days. The primary efficacy outcome was a combination of symptomatic VTE and VTE-related death or asymptomatic VTE at day 30. The primary safety outcome was the incidence of major or clinically relevant nonmajor bleeding. Two hundred and twenty-eight patients were enrolled and randomly assigned to receive rivaroxaban (n = 114)or enoxaparin (n = 114). The trial was stopped due to a lower-than-expected event rate. The primary efficacy outcome occurred in 3.51% of patients assigned to rivaroxaban and in 4.39% of patients assigned to enoxaparin (relative risk 0.80, 95% CI 0.22 to 2.90; p = 0.7344). Patients assigned to rivaroxaban had no primary bleeding event, and 3 patients (2.63%) in the enoxaparin group had a major or CRNM bleeding event (hazard ratio, 0.14; 95% CI, 0.007 to 2.73; P = 0.1963). In patients undergoing major gynecological cancer surgery, thromboprophylaxis with rivaroxaban 10 mg daily for 30 days had similar rates of thrombotic and bleeding events compared to parenteral enoxaparin 40 mg daily. While the power is limited due to not reaching the intended sample size, our results support the hypothesis that DOACs might be an attractive alternative strategy to LMWH to prevent VTE in this high-risk population.
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Affiliation(s)
| | | | | | | | | | | | - Marilsa Bermudez
- São Paulo State Public Women's Health Reference Center, São Paulo,
Brazil
| | | | | | - Valter Castelli
- Santa Casa de São Paulo School of Medical Sciences, São Paulo,
Brazil
| | | | - Giuliano Giova Volpiani
- Santa Casa de São Paulo School of Medical Sciences, São Paulo,
Brazil,Hospital e Maternidade Christóvão da Gama, Grupo DASA, Santo André,
SP, Brazil
| | | | | | | | | | - Jawed Fareed
- Hemostasis & Thrombosis Research Laboratories at Loyola
University Medical Center, Maywood, IL, USA
| | - Renato Delascio Lopes
- Duke Clinical Research Institute, Duke University School of
Medicine, Durham, NC, USA
| | - Eduardo Ramacciotti
- Science
Valley Research Institute, Santo André, São
Paulo, Brazil,Hospital e Maternidade Christóvão da Gama, Grupo DASA, Santo André,
SP, Brazil,Hemostasis & Thrombosis Research Laboratories at Loyola
University Medical Center, Maywood, IL, USA,Eduardo Ramacciotti, Science Valley
Research Institute, Santo André, São Paulo, Brazil.
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5
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Ribeiro CM, Souza M, Pelegrini BL, Palacios RS, Lima SM, Sato F, Bento AC, Baesso ML, Lima MMS. Ex vivo UV-vis and FTIR photoacoustic spectroscopy of natural nanoemulsions from cellulose nanocrystals and saponins topically applied into the skin: Diffusion rates and physicochemical evaluation. J Photochem Photobiol B 2022; 236:112587. [PMID: 36283255 DOI: 10.1016/j.jphotobiol.2022.112587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Revised: 09/29/2022] [Accepted: 10/13/2022] [Indexed: 12/15/2022]
Abstract
Nanoemulsions are increasingly gaining importance in the development of topically applied medicine and cosmetic products because their small droplets favor the penetration rates of active compounds into the body. In this scenario, the measurements of their diffusion rates as well as eventual physicochemical changes in the target tissues are of utmost importance. It is also recognized that the use of natural surfactants can avoid allergic reactions as frequently observed for synthetic products. The natural saponins extracted from Sapindus Saponaria have the property of forming foam and are exploited as biocompatible and biodegradable, while cellulose nanocrystals are known to increase the stability of a formulation avoiding the coalescence of drops at the interface. Therefore, nanoemulsions combining natural saponins and cellulose nanocrystals are promising systems that may facilitate greater diffusion rates of molecules into the skin, being candidates to substitute synthetic formulations. This study applied the Photoacoustic Spectroscopy technique to measure the diffusion rates and the physicochemical properties of nanoemulsified formulations containing saponins and cellulose nanocrystals topically applied to the skin. The ex vivo study combined the first-time photoacoustic measurements performed in both ultraviolet-visible and mid-infrared spectral regions. The toxicity of these formulations in L929 cells was also evaluated. The results showed that the formulations were able to propagate throughout the skin to a depth of approximately 756 μm, reaching the dermal side. The non-observation of absorbing band shifting or new bands in the FTIR spectra suggests that there were no structural changes in the skin as well as in the formulations after the nanoemulsions administration. The cytotoxicity results showed that the increase of cellulose nanocrystals concentration decreased cellular toxicity. In conclusion, the results demonstrated the advantage of combining photoacoustic methods in the ultraviolet-visible and mid-infrared spectral regions to analyze drug diffusion and interaction with the skin tissues. Both methods complement each other, allowing the confirmation of the nanoemulsion diffusion through the skin and also suggesting there were no detectable physicochemical changes in the tissues. Formulations stabilized with saponins and cellulose nanocrystals showed great potential for the development of topically administered cosmetics and drugs.
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Affiliation(s)
- C M Ribeiro
- Departamento de Farmácia, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil
| | - M Souza
- Departamento de Física, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil
| | - B L Pelegrini
- Departamento de Farmácia, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil
| | - R S Palacios
- Departamento de Física, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil
| | - S M Lima
- Centro de Estudos em Recursos Naturais- CERNA, Universidade Estadual de Mato Grosso do Sul-UEMS, 351, Dourados, MS, Brazil
| | - F Sato
- Departamento de Física, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil
| | - A C Bento
- Departamento de Física, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil
| | - M L Baesso
- Departamento de Física, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil.
| | - M M S Lima
- Departamento de Farmácia, Universidade Estadual de Maringá-UEM, 87020-900 Maringá, PR, Brazil.
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Ramacciotti E, Agati LB, Volpiani GG, Brito KF, Ribeiro CM, Aguiar VCR, Ramacciotti LS, Paganotti A, Pereira FM, Caffaro RA, Fioranelli A, Krakauer R, Rached HRS, Wolosker N, Anand SS, Eikelboom JW, Lopes RD. Rivaroxaban with Aspirin Versus Aspirin for Peripheral Arterial Disease and Intermittent Claudication. Rationale and Design of the COMPASS CLAUDICATION Trial. Clin Appl Thromb Hemost 2022; 28:10760296211073922. [PMID: 35043716 PMCID: PMC8796110 DOI: 10.1177/10760296211073922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND The COMPASS trial demonstrated that in patients with peripheral arterial disease, the combination of rivaroxaban and aspirin compared with aspirin reduces the risk of major adverse limb events, but it is not known whether this combination can also improve symptoms in patients with intermittent claudication. The primary objective of this study is to evaluate the effect of the combination on claudication distance. STUDY DESIGN Eighty-eight patients with intermittent claudication will be randomized to receive rivaroxaban 2.5 mg twice daily plus aspirin 100 mg once daily or aspirin 100 mg once daily for 24 weeks. The primary outcome is the change in claudication distance from the baseline to 24 weeks, measured by 6 min walking test and treadmill test. The primary safety outcome is the incidence of major bleeding and clinically relevant non-major bleeding according to the International Society on Thrombosis and Hemostasis criteria. SUMMARY The COMPASS CLAUDICATION trial will provide high-quality evidence regarding the effect of the combination of rivaroxaban and aspirin on claudication distance in patients with peripheral arterial disease.
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Affiliation(s)
- Eduardo Ramacciotti
- 600818Science Valley Research Institute, Santo André, São Paulo, Brazil.,Hospital e Maternidade Dr. Christóvão da Gama, DASA, São Paulo, SP, Brazil.,25815Hemostasis & Thrombosis Research Laboratories at Loyola University Medical Center, Maywood, IL, USA
| | | | - Giuliano Giova Volpiani
- 600818Science Valley Research Institute, Santo André, São Paulo, Brazil.,Hospital e Maternidade Dr. Christóvão da Gama, DASA, São Paulo, SP, Brazil.,67742Irmandade da Santa Casa de Misericórdia de São Paulo, São Paulo, São Paulo, Brazil
| | - Karen Falcão Brito
- 67742Irmandade da Santa Casa de Misericórdia de São Paulo, São Paulo, São Paulo, Brazil
| | | | | | | | - Alexia Paganotti
- 67742Irmandade da Santa Casa de Misericórdia de São Paulo, São Paulo, São Paulo, Brazil
| | | | | | - Alexandre Fioranelli
- 67742Irmandade da Santa Casa de Misericórdia de São Paulo, São Paulo, São Paulo, Brazil
| | - Rogério Krakauer
- Hospital e Maternidade Dr. Christóvão da Gama, DASA, São Paulo, SP, Brazil
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7
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Grill MH, Caffaro RA, Grill TA, Júnior VC, Kikuchi R, Ribeiro CM, da Silva VS, Tafur AJ, Caprini JA, Ramacciotti E. A Prospective Study Evaluating Patterns of Responses to the Caprini Score to Prevent Venous Thromboembolism After Interventional Treatment for Varicose Veins. Clin Appl Thromb Hemost 2022; 28:10760296221112081. [PMID: 35850592 PMCID: PMC9309759 DOI: 10.1177/10760296221112081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Background Venous thromboembolism (VTE) is a critical complication of varicose vein
treatments. The Caprini Score (CS) is an established tool to assess
patients’ VTE risks. One disadvantage is the number of questions required,
some of them referring to a low incidence of disease, even lower in patients
seeking an elective procedure. These elements take time and may result in
filling errors if the CS is not filled out by a properly trained health
professional. Objective To establish a response pattern in CS, with emphasis on questions that
usually have a negative answer and propose a simpler adaptative digital
version without changing the original structure of the tool. Methods two hundred and twenty-seven patients in the pre-surgical treatment of
varicose veins were enrolled prospectively and submitted to the CS
evaluation. Results The pattern of dichotomous responses could be divided arbitrarily into four
subgroups considering the percentage of positive responses: none (11 items),
less than 3% (13 items), between 3% and 20% (5 items), and more than 20% (8
items). Of the 12 CS questions related to illnesses that occurred in the
last month, ten had had no responses, and 2 were less than 3%. Conclusion There is a pattern in the CS responses of patients with an indication of
surgical treatment of varicose veins. Many of the CS questions are not
helpful in this scenario and may result in filling errors performed by
untrained providers. An adaptative version of the CS might benefit varicose
veins surgery VTE risk stratification
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Affiliation(s)
| | | | | | | | - Roberto Kikuchi
- Santa Casa de São Paulo School of Medical Science, São Paulo, Brazil
| | | | | | - Alfonso J Tafur
- 3271NorthShore University Health System, Evanston, Illinois, USA
| | - Joseph A Caprini
- 3271NorthShore University Health System, Evanston, Illinois, USA
| | - Eduardo Ramacciotti
- Santa Casa de São Paulo School of Medical Science, São Paulo, Brazil.,600818Science Valley Research Institute, São Paulo, Brazil.,23356Hemostasis & Thrombosis Research Laboratories at Loyola University Medical Center, Maywood, IL, USA
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8
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Rocha AP, Candeias MF, Ribeiro CM, Vieira JP, Rocha-Brito MJ. A case of pediatric HIV myelopathy. Rev Neurol 2020; 68:531-532. [PMID: 31173334 DOI: 10.33588/rn.6812.2018408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- A P Rocha
- Hospital de Dona Estefania, Lisboa, Portugal
| | | | - C M Ribeiro
- Hospital de Dona Estefania, Lisboa, Portugal
| | - J P Vieira
- Hospital de Dona Estefania, Lisboa, Portugal
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9
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de Souza PC, Fernandes GFS, Marino LB, Ribeiro CM, Silva PBD, Chorilli M, Silva CSP, Resende FA, Solcia MC, de Grandis RA, Costa CAS, Cho SH, Wang Y, Franzblau SG, Dos Santos JL, Pavan FR. Furoxan derivatives demonstrated in vivo efficacy by reducing Mycobacterium tuberculosis to undetectable levels in a mouse model of infection. Biomed Pharmacother 2020; 130:110592. [PMID: 32763822 DOI: 10.1016/j.biopha.2020.110592] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 07/28/2020] [Accepted: 07/29/2020] [Indexed: 01/08/2023] Open
Abstract
OBJECTIVES The most recent survey conducted by the World Health Organization described Tuberculosis (TB) as one of the top 10 causes of death and the leading cause of death from a single infectious agent. The increasing number of TB-resistant cases has contributed to this scenario. In light of this, new strategies to control and treat the disease are necessary. Our research group has previously described furoxan derivatives as promising scaffolds to be explored as new antitubercular drugs. RESULTS Two of these furoxan derivatives, (14b) and (14c), demonstrated a high selectivity against Mycobacterium tuberculosis. The compounds (14b) and (14c) were also active against a latent M. tuberculosis strain, with MIC90 values of 6.67 μM and 9.84 μM, respectively; they were also active against monoresistant strains (MIC90 values ranging from 0.61 to 20.42 μM) and clinical MDR strains (MIC90 values ranging from 3.09 to 42.95 μM). Time-kill experiments with compound (14c) showed early bactericidal effects that were superior to those of the first- and second-line anti-tuberculosis drugs currently used in therapy. The safety of compounds (14b) and (14c) was demonstrated by the Ames test because these molecules were not mutagenic under the tested conditions. Finally, we confirmed the safety, and high efficacy of compounds (14b) and (14c), which reduced M. tuberculosis to undetectable levels in a mouse aerosol model of infection. CONCLUSION Altogether, we have identified two advanced lead compounds, (14b) and (14c), as novel promising candidates for the treatment of TB infection.
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Affiliation(s)
- P C de Souza
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Tuberculosis Research Laboratory, Araraquara, São Paulo, 14800-903, Brazil
| | - G F S Fernandes
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Department of Drugs and Medicines, Araraquara, São Paulo, 14800-903, Brazil
| | - L B Marino
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Tuberculosis Research Laboratory, Araraquara, São Paulo, 14800-903, Brazil
| | - C M Ribeiro
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Tuberculosis Research Laboratory, Araraquara, São Paulo, 14800-903, Brazil
| | - P B da Silva
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Department of Drugs and Medicines, Araraquara, São Paulo, 14800-903, Brazil
| | - M Chorilli
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Department of Drugs and Medicines, Araraquara, São Paulo, 14800-903, Brazil
| | - C S P Silva
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Tuberculosis Research Laboratory, Araraquara, São Paulo, 14800-903, Brazil
| | - F A Resende
- Department of Biological Sciences and Health, UNIARA - University of Araraquara, Araraquara, São Paulo, 14801-340, Brazil
| | - M C Solcia
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Tuberculosis Research Laboratory, Araraquara, São Paulo, 14800-903, Brazil
| | - R A de Grandis
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Tuberculosis Research Laboratory, Araraquara, São Paulo, 14800-903, Brazil; Department of Biological Sciences and Health, UNIARA - University of Araraquara, Araraquara, São Paulo, 14801-340, Brazil
| | - C A S Costa
- São Paulo State University (UNESP), School of Odontology, Department of Physiology and Pathology, Araraquara, São Paulo, 14801-903, Brazil
| | - S H Cho
- Institute of Tuberculosis Research, UIC - University of Illinois at Chicago, Chicago, Illinois, 60612-7231, USA
| | - Y Wang
- Institute of Tuberculosis Research, UIC - University of Illinois at Chicago, Chicago, Illinois, 60612-7231, USA
| | - S G Franzblau
- Institute of Tuberculosis Research, UIC - University of Illinois at Chicago, Chicago, Illinois, 60612-7231, USA
| | - J L Dos Santos
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Department of Drugs and Medicines, Araraquara, São Paulo, 14800-903, Brazil
| | - F R Pavan
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Tuberculosis Research Laboratory, Araraquara, São Paulo, 14800-903, Brazil.
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Avellar MCW, Ribeiro CM, Dias-da-Silva MR, Silva EJR. In search of new paradigms for epididymal health and disease: innate immunity, inflammatory mediators, and steroid hormones. Andrology 2019; 7:690-702. [PMID: 31207127 DOI: 10.1111/andr.12654] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 04/22/2019] [Accepted: 04/29/2019] [Indexed: 02/07/2023]
Abstract
The primary job of the epididymis is to mature and protect the luminally transiting spermatozoa. Mounting evidence is showing that innate immune components [including Toll-like receptors (TLRs) and antimicrobial proteins, among which are β-defensins] and inflammatory mediators, under the primary influence of androgens, participate in the cellular and molecular processes that define this tissue. Here, we present an overview of the contributions of these signaling pathway components during epididymal homeostasis and discuss the hypotheses as to their involvement in epididymitis, the most common urological inflammatory condition in men, frequently impairing their fertility. Drawing primarily from rodent models, we also focus on how the distribution and functional expression of innate immune components are differentially regulated in the prenatal developing epididymis, providing new insights into the disruption of these signaling pathways throughout the lifespan. Male infertility is caused by a variety of conditions, such as congenital malformations, genetic and endocrine disorders, exposure to environmental toxicants, and inflammatory/infectious conditions. More than one-third of infertile men with an idiopathic condition cannot currently be adequately diagnosed. Thinking about the innate immunity and inflammation context of the epididymis may provide new insights and directions as to how these systems contribute to male fertility, as well as also uncover urological and andrological outcomes that may aid clinicians in diagnosing and preventing epididymal pathologies.
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Affiliation(s)
- M C W Avellar
- Department of Pharmacology, Universidade Federal de São Paulo - Escola Paulista de Medicina, São Paulo, SP, Brazil
| | - C M Ribeiro
- Department of Pharmacology, Universidade Federal de São Paulo - Escola Paulista de Medicina, São Paulo, SP, Brazil
| | - M R Dias-da-Silva
- Department of Medicine, Universidade Federal de São Paulo - Escola Paulista de Medicina, São Paulo, SP, Brazil
| | - E J R Silva
- Department of Pharmacology, Institute of Biosciences of Botucatu, Universidade Estadual Paulista 'Júlio de Mesquita Filho', Botucatu, SP, Brazil
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11
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Ribeiro CM, de Carli ML, Nonogaki S, Nogueira DA, Pereira AAC, Sperandio FF, Hanemann JAC. M2 macrophages coexist with a Th1-driven profile in periapical cysts. Int Endod J 2017; 51 Suppl 2:e87-e93. [PMID: 28857183 DOI: 10.1111/iej.12849] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Accepted: 08/24/2017] [Indexed: 10/19/2022]
Abstract
AIM To evaluate the participation of both Th1 and Th2 responses in periapical cysts by assessing the presence of M2 macrophages, as well as acute IL-1 β, TNF-α and IL-6 cytokines. METHODOLOGY Twenty-four cases of periapical cysts were selected. Immuno-expressions of IL-1 β, IL-6, TNF-α and CD163 were analysed in the cystic capsules in both superficial and deeper regions. Data were analysed with paired Wilcoxon test and Spearman correlation coefficient (P ≤ 0.05). RESULTS There was a higher expression of IL-1β, IL-6, TNF-α and M2 macrophages in the superficial region (P < 0.001) of cystic capsules. All acute cytokines had significant positive correlations amongst them regardless of the cystic capsule region. Regarding CD163, positive correlations occurred only with TNF-α (P = 0.007; r = 0.537) and IL-6 (P = 0.018; r = 0.478) in the superficial regions of the cystic capsule. CONCLUSIONS M2 macrophages participated actively in the inflammatory response of periapical cysts and correlated with the expression of certain acute Th1-related cytokines. This illustrates the coexistence of an acute and chronic Th2-driven immune response in these lesions. Although M2 macrophages favour the healing process, their presence is not sufficient for periapical cyst regression, once an acute active response has occurred due to an infectious stimuli.
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Affiliation(s)
- C M Ribeiro
- Department of Clinic and Surgery, School of Dentistry, Federal University of Alfenas, Alfenas, MG, Brazil
| | - M L de Carli
- Department of Clinic and Surgery, School of Dentistry, Federal University of Alfenas, Alfenas, MG, Brazil
| | - S Nonogaki
- Pathology Center, Adolfo Lutz Institute, São Paulo, SP, Brazil
| | - D A Nogueira
- Institute of Exact Sciences, Federal University of Alfenas, Alfenas, MG, Brazil
| | - A A C Pereira
- Department of Pathology and Parasitology, Institute of Biomedical Sciences, Federal University of Alfenas, Alfenas, MG, Brazil
| | - F F Sperandio
- Department of Pathology and Parasitology, Institute of Biomedical Sciences, Federal University of Alfenas, Alfenas, MG, Brazil
| | - J A C Hanemann
- Department of Clinic and Surgery, School of Dentistry, Federal University of Alfenas, Alfenas, MG, Brazil
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12
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Ribeiro CM, Pereira OCM. 5alpha-reductase 2 inhibition impairs brain defeminization of male rats: reproductive aspects. Pharmacol Biochem Behav 2006; 82:228-35. [PMID: 16168471 DOI: 10.1016/j.pbb.2005.08.015] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2005] [Revised: 08/18/2005] [Accepted: 08/24/2005] [Indexed: 11/18/2022]
Abstract
The present study was carried out to determine whether 5alpha-reductase 2 (5alpha-R2) metabolic pathway plays a key role in brain sexual differentiation. The inhibition of 5alpha-R2 by finasteride (20 mg/kg/day) from gestational day 19 to postnatal day 5 has long-term effects on sexual behavior and reproductive physiology detected only in adult life. Sexual maturation assessed by timing of preputial separation was unchanged. Finasteride-treated males were able to mate with untreated females which became pregnant but exhibited increased rate of pre-implantation loss. The subfertility observed was probably due to abnormally shaped sperm, since the sperm number was not altered. While plasma testosterone was enhanced, LH levels were not changed. The copulatory potential was not affected and all finasteride-treated rats presented male sexual behavior. Despite this, 53% of them showed homosexual behavior when pretreated with estradiol, suggesting an incomplete brain defeminization. These results indicate that 5alpha-R2 acts in brain sexual differentiation of male rats. Moreover, we suggest that 5alpha-R2 not only produces essential metabolites that act together with estradiol in brain sexual differentiation but also protects the brain from the damaging effects of estradiol excess.
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Affiliation(s)
- Camilla Moreira Ribeiro
- Department of Pharmacology, Institute of Biosciences, Sao Paulo State University- UNESP, 18618-000 Botucatu, SP, Brazil
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13
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Kreda SM, Sumner M, Fillo S, Ribeiro CM, Luo GX, Xie W, Daniel KW, Shears S, Collins S, Wetsel WC. alpha(1)-adrenergic receptors mediate LH-releasing hormone secretion through phospholipases C and A(2) in immortalized hypothalamic neurons. Endocrinology 2001; 142:4839-51. [PMID: 11606452 DOI: 10.1210/endo.142.11.8506] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Norepinephrine has long been known to stimulate the pulsatile and preovulatory release of LH-releasing hormone (LHRH). In vivo and in vitro studies indicate that these effects are mediated primarily through alpha(1)-adrenergic receptors (alpha(1)-ARs). With the immortalized hypothalamic LHRH neurons, we have found that alpha(1)-adrenergic agents directly stimulate the secretion of LHRH in a dose-dependent manner. Ligand binding and RNA studies demonstrate that the GT1 cells contain both alpha(1A)- and alpha(1B)-ARs. Competition binding experiments show that approximately 75% of the binding is due to alpha(1B)-ARs; the remainder is made up of alpha(1A)-ARs. Receptor activation leads to stimulation of PLC. PLC beta 1 and PLC beta 3 are expressed in GT1 neurons, and these PLCs are probably responsible for the release of diacylglycerol and IP as well as the increase in intracellular calcium. The mobilization of cytoplasmic calcium is sufficient to stimulate cytosolic PLA(2) (cPLA(2)) and release arachidonic acid. A dissection of the contributions of the phospholipases to LHRH secretion suggests that cPLA(2) acts downstream of PLC and that it significantly augments the PLC-stimulated LHRH secretory response. Inasmuch as the alpha(1)-ARs are known to play a critical role in LHRH physiology, we propose that both PLC and cPLA(2) are critical in regulating and amplifying LHRH release.
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Affiliation(s)
- S M Kreda
- Laboratory of Signal Transduction, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709, USA
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14
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Lazarowski ER, Rochelle LG, O'Neal WK, Ribeiro CM, Grubb BR, Zhang V, Harden TK, Boucher RC. Cloning and functional characterization of two murine uridine nucleotide receptors reveal a potential target for correcting ion transport deficiency in cystic fibrosis gallbladder. J Pharmacol Exp Ther 2001; 297:43-9. [PMID: 11259526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023] Open
Abstract
Extracellular nucleotides regulate transepithelial ion secretion via multiple receptors. The P2Y(2) receptor is the predominant transducer of chloride transport responses to nucleotides in the airways, but the P2 receptors that control ion transport in gastrointestinal epithelia have not been identified. UTP and UDP promote chloride secretion in mouse jejuna and gallbladder epithelia, respectively, and these responses were unaffected by P2Y(2) receptor gene disruption. Pharmacological data suggested the involvement of P2Y(4) and P2Y(6) receptors in gastrointestinal responses. To identify the P2Y receptors responsible for the gastrointestinal actions of UTP and UDP, we have cloned the murine P2Y(4) and P2Y(6) receptors and have stably expressed each in a null cell line to examine the nucleotide-promoted inositol phosphate formation and intracellular Ca(2+) mobilization. The (m)P2Y(4) receptor was potently, but not selectively, activated by UTP (UTP > or = ATP >ITP > GTP > CTP), and it was not activated by UDP or ADP. The (m)P2Y(6) receptor was highly selective for UDP (UDP >> ADP = GDP). The nucleotide selectivities observed with the recombinant (m)P2Y(4) and (m)P2Y(6) receptors resemble those for nucleotide-promoted chloride transport in murine P2Y(2)(-/-) jejuna and gallbladder epithelial cells, respectively. Ion transport responses to nucleotide additions were examined in freshly excised tissues from cystic fibrosis transmembrane regulator-deficient mice. Although the effect of UTP on jejunal short-circuit current (I(sc)) was impaired in the CF mouse, UDP-promoted I(sc) changes were not affected in CF gallbladder epithelium, suggesting that the P2Y(6) receptor is a target for treatment of CF gallbladder disease.
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Affiliation(s)
- E R Lazarowski
- University of North Carolina School of Medicine, Department of Medicine, Cystic Fibrosis/Pulmonary Research and Treatment Center, CB #7248, 7017 Thurston-Bowles Building, Chapel Hill, NC 27599-7248, USA.
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15
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Abstract
Airway epithelia are confronted with distinct signals emanating from the luminal and/or serosal environments. This study tested whether airway epithelia exhibit polarized intracellular free calcium (Ca(2+)(i)) and anion secretory responses to 5' triphosphate nucleotides (ATP/UTP), which may be released across both barriers of these epithelia. In both normal and cystic fibrosis (CF) airway epithelia, mucosal exposure to ATP/UTP increased Ca(2+)(i) and anion secretion, but both responses were greater in magnitude for CF epithelia. In CF epithelia, the mucosal nucleotide-induced response was mediated exclusively via Ca(2+)(i) interacting with a Ca(2+)-activated Cl(-) channel (CaCC). In normal airway epithelia (but not CF), nucleotides stimulated a component of anion secretion via a chelerythrine-sensitive, Ca(2+)-independent PKC activation of cystic fibrosis transmembrane conductance regulator. In normal and CF airway epithelia, serosally applied ATP or UTP were equally effective in mobilizing Ca(2+)(i). However, serosally applied nucleotides failed to induce anion transport in CF epithelia, whereas a PKC-regulated anion secretory response was detected in normal airway epithelia. We conclude that (1) in normal nasal epithelium, apical/basolateral purinergic receptor activation by ATP/UTP regulates separate Ca(2+)-sensitive and Ca(2+)-insensitive (PKC-mediated) anion conductances; (2) in CF airway epithelia, the mucosal ATP/UTP-dependent anion secretory response is mediated exclusively via Ca(2+)(i); and (3) Ca(2+)(i) regulation of the Ca(2+)-sensitive anion conductance (via CaCC) is compartmentalized in both CF and normal airway epithelia, with basolaterally released Ca(2+)(i) failing to activate CaCC in both epithelia.
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Affiliation(s)
- A M Paradiso
- Cystic Fibrosis/Pulmonary Research and Treatment Center, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.
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16
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Abstract
This review discusses multiple ways in which the endoplasmic reticulum participates in and is influenced by signal transduction pathways. The endoplasmic reticulum provides a Ca2+ store that can be mobilized either by calcium-induced calcium release or by the diffusible messenger inositol 1,4,5-trisphosphate. Depletion of endoplasmic reticulum Ca2+ stores provides a signal that activates surface membrane Ca2+ channels, a process known as capacitative calcium entry. Depletion of endoplasmic reticulum stores can also signal long-term cellular responses such as gene expression and programmed cell death or apoptosis. In addition to serving as a source of cellular signals, the endoplasmic reticulum is also functionally and structurally modified by the Ca2+ and protein kinase C pathways. Elevated cytoplasmic Ca2+ causes a rearrangement and fragmentation of endoplasmic reticulum membranes. Protein kinase C activation reduces the storage capacity of the endoplasmic reticulum Ca2+ pool. In some cell types, protein kinase C inhibits capacitative calcium entry. Protein kinase C activation also protects the endoplasmic reticulum from the structural effects of high cytoplasmic Ca2+. The emerging view is one of a complex network of pathways through which the endoplasmic reticulum and the Ca2+ and protein kinase C signaling pathways interact at various levels regulating cellular structure and function.
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Affiliation(s)
- J W Putney
- Calcium Regulation Section, Laboratory of Signal Transduction, National Institute of Environmental Health Sciences-NIH, Research Triangle Park, North Carolina 27709, USA.
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Ferraz HM, Grazini MV, Ribeiro CM, Brocksom U, Brocksom TJ. A short route to (-)-mintlactone by thallium(III)-mediated cyclization of (-)-isopulegol. J Org Chem 2000; 65:2606-7. [PMID: 10789485 DOI: 10.1021/jo991802j] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- H M Ferraz
- Instituto de Química, Universidade de S. Paulo, Brazil
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18
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Ribeiro CM, McKay RR, Hosoki E, Bird GS, Putney JW. Effects of elevated cytoplasmic calcium and protein kinase C on endoplasmic reticulum structure and function in HEK293 cells. Cell Calcium 2000; 27:175-85. [PMID: 11007130 DOI: 10.1054/ceca.2000.0108] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
In human embryonic kidney (HEK) cells stably transfected with green fluorescent protein targeted to the endoplasmic reticulum (ER), elevation of intracellular Ca2+ ([Ca2+]i) altered ER morphology, making it appear punctate. Electron microscopy revealed that these punctate structures represented circular and branched rearrangements of the endoplasmic reticulum, but did not involve obvious swelling or pathological fragmentation. Activation of protein kinase C with phorbol 12-myristate 13-acetate (PMA), prevented the effects of ionomycin on ER structure without affecting the elevation of [Ca2+]i. These results suggest that protein kinase C activation alters cytoplasmic or ER components underlying the effects of high [Ca2+]i on ER structure. Treatment of HEK cells with PMA also reduced the size of the thapsigargin-sensitive Ca2+ pool and inhibited Ca2+ entry in response to thapsigargin. Thus, protein kinase C activation has multiple actions on the calcium storage and signalling function of the endoplasmic reticulum in HEK cells: (1) reduced intracellular Ca2+ storage capacity, (2) inhibition of capacitative Ca2+ entry, and (3) protection of the endoplasmic reticulum against the effects of high [Ca2+]i.
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Affiliation(s)
- C M Ribeiro
- National Institute of Environmental Health Sciences, National Institute of Health, Research Triangle Park, North Carolina 27709, USA
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19
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Bird GS, Louzao MC, Ribeiro CM, Putney JW. Calcium signalling in exocrine glands. Eur J Morphol 1998; 36 Suppl:153-6. [PMID: 9825912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
In exocrine gland cells, stimulation of a variety of surface receptors initiates a Ca2+ signalling system through activation of a polyphosphoinositide-specific phospholipase C. One product of phospholipase C activity, inositol 1,4,5-trisphosphate ((1,4,5)IP3), signals the release of intracellular Ca2+. Release of intracellular Ca2+ is followed by entry of Ca2+ into the cell across the plasma membrane. The mechanism by which Ca2+ entry is regulated is not well understood, although it is clear that (1,4,5)IP3 plays an important role. One hypothesis suggests that Ca2+ entry is triggered by the depletion of intracellular Ca2+ stores by (1,4,5)IP3, a process termed 'capacitative calcium entry'. The purpose of these studies is to gain understanding into the processes controlling capacitative calcium entry in exocrine gland cells.
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Affiliation(s)
- G S Bird
- Calcium Regulation Section, Lab. Signal Transduction, Nat. Inst. Environmental Health Sciences, NIH Research Triangle Park, NC 27709, USA.
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20
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Ribeiro CM, Reece J, Putney JW. Role of the cytoskeleton in calcium signaling in NIH 3T3 cells. An intact cytoskeleton is required for agonist-induced [Ca2+]i signaling, but not for capacitative calcium entry. J Biol Chem 1997; 272:26555-61. [PMID: 9334235 DOI: 10.1074/jbc.272.42.26555] [Citation(s) in RCA: 148] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Treatment of NIH 3T3 cells with cytochalasin D (10 microM, 1 h at 37 degrees C) disrupted the actin cytoskeleton and changed the cells from a planar, extended morphology, to a rounded shape. Calcium mobilization by ATP or by platelet-derived growth factor was abolished, while the ability of thapsigargin (2 microM) to empty calcium stores and activate calcium influx was unaffected. Similar experiments with nocodazole to depolymerize the tubulin network yielded identical results. Platelet-derived growth factor induced an increase in inositol phosphates, and this increase was undiminished in the presence of cytochalasin D. Therefore, the blockade of agonist responses by this drug does not result from decreased phospholipase C. Injection of inositol 1,4,5-trisphosphate (IP3) released calcium to the same extent in control and cytochalasin D-treated cells. Confocal microscopic studies revealed a significant rearrangement of the endoplasmic reticulum after cytochalasin D treatment. Thus, disruption of the cytoskeleton blocks agonist-elicited [Ca2+]i mobilization, but this effect does not result from a lower calcium storage capacity, impaired function of the IP3 receptor, or diminished phospholipase C activity. We suggest that cytoskeletal disruption alters the spatial relationship between phospholipase C and IP3 receptors, impairing phospholipase C-dependent calcium signaling. Capacitative calcium entry was not altered under these conditions, indicating that the coupling between depletion of intracellular calcium stores and calcium entry does not depend on a precise structural relationship between intracellular stores and plasma membrane calcium channels.
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Affiliation(s)
- C M Ribeiro
- Laboratory of Signal Transduction, NIEHS, National Institutes of Health, Research Triangle Park, North Carolina 27709, USA
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21
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Ribeiro CM, Putney JW. Differential effects of protein kinase C activation on calcium storage and capacitative calcium entry in NIH 3T3 cells. J Biol Chem 1996; 271:21522-8. [PMID: 8702937 DOI: 10.1074/jbc.271.35.21522] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
In NIH 3T3 cells, treatment with phorbol 12-myristate 13-acetate (PMA) reduced the release of Ca2+ by thapsigargin, but did not activate Ca2+ entry; Ca2+ influx was triggered after the residual pool was emptied by thapsigargin, and this Ca2+ influx was similar to that induced by thapsigargin in control cells. The effect of PMA was due to decreased Ca2+ storage because 1) Ca2+ release by ionomycin was similarly affected by PMA, and in both control and PMA-treated cells, ionomycin did not release Ca2+ following thapsigargin treatment; 2) PMA reduced 45Ca2+ accumulation; and 3) studies with Ca2+ indicator compartmentalized into the endoplasmic reticulum indicated that stored Ca2+ was reduced by PMA. Although PMA did not itself activate Ca2+ entry, PMA potentiated Ca2+ entry with low concentrations of cyclopiazonic acid. With a somewhat higher concentration of cyclopiazonic acid, PMA had no effect on calcium entry. Thus, protein kinase C has two apparent actions on calcium signaling in NIH 3T3 cells: 1) reduced intracellular Ca2+ storage capacity and 2) augmented calcium entry with submaximal intracellular Ca2+ pool depletion. These actions indicate a complex and potentially important role for the protein kinase C system in calcium homeostasis in this cell type.
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Affiliation(s)
- C M Ribeiro
- NIEHS, National Institutes of Health, Research Triangle Park, North Carolina 27709, USA
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22
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Abstract
The Ca2+-ATPase inhibitor, thapsigargin, activated Ca2+ entry into pancreatic acinar cells, a process known as capacitative calcium entry. In cells loaded with the calcium chelator BAPTA, the transient Ca2+ release was blunted and the rise of [Ca2+]i on readdition of Ca2+ was slowed. However, the steady-state [Ca2+]i due to Ca2+ entry was substantially augmented compared with control cells. This indicates that [Ca2+]i exerts a negative feedback on Ca2+ entry from a compartment buffered by BAPTA and separated from the bulk of cytoplasmic Ca2+. This interaction probably occurs close to the calcium channel where [Ca2+] is higher than in the bulk of the cytoplasm. In support of this interpretation, the slower Ca2+ chelator, EGTA, also blunted the release of Ca2+ and slowed the rise of the sustained [Ca2+]i phase but failed to augment steady-state [Ca2+]i. In contrast, Ca2+ entry in NIH 3T3 cells was characterized by a transient rise of [Ca2+]i that decays to near prestimulus levels. This decay in Ca2+ entry also results from negative feedback by Ca2+ because the decrease in Ca2+ entry was reversed by incubation in a Ca2+-deficient medium. However, unlike its effects in acinar cells, BAPTA neither augmented steady-state [Ca2+]i nor prevented the inactivation of entry. Rather, in BAPTA-loaded cells, [Ca2+]i failed to increase substantially suggesting that negative regulation by Ca2+ may occur at a site distinct from the cytoplasmic compartment and inaccessible to cytoplasmic BAPTA. These two distinct types of feedback behavior may indicate subtypes of store-operated calcium channels expressed in different cells or a single type of channel which is differentially regulated in a cell type-specific manner.
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Affiliation(s)
- M C Louzao
- Calcium Regulation Section, Laboratory of Cellular and Molecular Pharmacology, NIEHS, National Institutes of Health, Research Triangle Park, North Carolina 27709, USA
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23
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Angerami EL, Gomes DL, Mishima SM, Hayashida M, Ribeiro CM, Reis JN. [Comparative study of the names of subjects in the official curriculum with those used by nursing schools in the southeast of Brazil]. Rev Lat Am Enfermagem 1996; 4:31-46. [PMID: 8807971 DOI: 10.1590/s0104-11691996000100004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
The authors compared the names of the subjects that form the official curriculum to those offered by the schools of nursing in the South East of Brazil. Forty eight schools replied to the questionnaire, a variance in the names and numbers of the subjects offered was found, indicating a difference in the way each school performs the curriculum.
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Abstract
We have previously shown that parathyroid hormone (PTH)-(1-34) or its analogue PTH-(3-34) inhibits proximal tubule (PT) Na(+)-K(+)-adenosinetriphosphatase (Na(+)-K(+)-ATPase) activity independently of adenosine 3',5'-cyclic monophosphate generation. The present study used PT suspensions to investigate the signaling pathway responsible for this hormonal action. PTH-(1-34) and PTH-(3-34) significantly increased the release of arachidonic acid (AA) compared with control tubules, suggesting activation of phospholipase A2 (PLA2). AA, 10(-6) M, mimicked the inhibition of the pump by 10(-8) M PTH-(3-34), and together were not additive. Eicosatetraynoic acid, 3 microM, a general inhibitor of AA metabolism, blocked the PTH action. Indomethacin, 10 microM, an inhibitor of AA-dependent cyclooxygenase, did not prevent the PTH action, but 2 microM 7-ethoxyresorufin, a cytochrome P-450 inhibitor, prevented the PTH effect. 20-Hydroxyeicosatetraenoic acid (20-HETE), the main product of P-450 metabolism in PT, inhibited Na(+)-K(+)-ATPase activity to the same extent as 10(-8) M PTH-(3-34), was not additive with PTH, and was maximally inhibitory at 10(-7) M. To further investigate the signaling pathway responsible for PTH-activated PLA2, we tested the effect of PTH on cytoplasmic free Ca2+ ([Ca2+]i). PTH-(1-34), 10(-7) M, did not affect [Ca2+]i, although 10(-8) M angiotensin II promoted a Ca2+ transient. Treatment of PT with pertussis toxin (PTX) did not prevent the PTH action.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- C M Ribeiro
- Department of Cell Biology, Duke University, Durham, North Carolina 27710
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25
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de Andrade LD, Ribeiro CM. [Psychometric study of the social attitudes of adolescents]. J Bras Psiquiatr 1970; 19:153-61. [PMID: 4949174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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26
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Ribeiro CM, Martinez BM, de Carvalho AC. [Program of administration applied to nursing for a graduate nursing course]. Rev Bras Enferm 1965; 18:7-37. [PMID: 5176580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
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