1
|
Bethencourt-Estrella CJ, Delgado-Hernández S, López-Arencibia A, San Nicolás-Hernández D, Salazar-Villatoro L, Omaña-Molina M, Tejedor D, García-Tellado F, Lorenzo-Morales J, Piñero JE. Acrylonitrile derivatives: In vitro activity and mechanism of cell death induction against Trypanosoma cruzi and Leishmania amazonensis. Int J Parasitol Drugs Drug Resist 2024; 24:100531. [PMID: 38484645 PMCID: PMC10950693 DOI: 10.1016/j.ijpddr.2024.100531] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 02/16/2024] [Accepted: 02/27/2024] [Indexed: 03/24/2024]
Abstract
Leishmaniasis and Chagas disease are parasitic infections that affect millions of people worldwide, producing thousands of deaths per year. The current treatments against these pathologies are not totally effective and produce some side effects in the patients. Acrylonitrile derivatives are a group of compounds that have shown activity against these two diseases. In this work, four novels synthetic acrylonitriles were evaluated against the intracellular form and extracellular forms of L. amazonensis and T. cruzi. The compounds 2 and 3 demonstrate to have good selectivity indexes against both parasites, specifically the compound 3 against the amastigote form (SI = 6 against L. amazonensis and SI = 7.4 against T. cruzi). In addition, the parasites treated with these two compounds demonstrate to produce a programmed cell death, since they were positive for the events studied related to this type of death, including chromatin condensation, accumulation of reactive oxygen species and alteration of the mitochondrial membrane potential. In conclusion, this work confirms that acrylonitriles is a source of possible new compounds against kinetoplastids, however, more studies are needed to corroborate this activity.
Collapse
Affiliation(s)
- Carlos J Bethencourt-Estrella
- Instituto Universitario de Enfermedades Tropicales y Salud Pública de Canarias, Universidad de La Laguna, Avda. Astrofísico Fco. Sánchez, S/N, 38203 La Laguna, Islas Canarias, Tenerife, Spain; Departamento de Obstetricia y Ginecología, Pediatría, Medicina Preventiva y Salud Pública, Toxicología, Medicina Legal y Forense y Parasitología, Universidad de La Laguna, Islas Canarias, Tenerife, Spain; CIBER de Enfermedades Infecciosas (CIBERINFEC), Instituto de Salud Carlos III, 28029 Madrid, Spain.
| | - Samuel Delgado-Hernández
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas, Avda. Fco. Sánchez 3, 38206 La Laguna, Islas Canarias, Tenerife, Spain
| | - Atteneri López-Arencibia
- Instituto Universitario de Enfermedades Tropicales y Salud Pública de Canarias, Universidad de La Laguna, Avda. Astrofísico Fco. Sánchez, S/N, 38203 La Laguna, Islas Canarias, Tenerife, Spain; Departamento de Obstetricia y Ginecología, Pediatría, Medicina Preventiva y Salud Pública, Toxicología, Medicina Legal y Forense y Parasitología, Universidad de La Laguna, Islas Canarias, Tenerife, Spain; CIBER de Enfermedades Infecciosas (CIBERINFEC), Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Desirée San Nicolás-Hernández
- Instituto Universitario de Enfermedades Tropicales y Salud Pública de Canarias, Universidad de La Laguna, Avda. Astrofísico Fco. Sánchez, S/N, 38203 La Laguna, Islas Canarias, Tenerife, Spain; Departamento de Obstetricia y Ginecología, Pediatría, Medicina Preventiva y Salud Pública, Toxicología, Medicina Legal y Forense y Parasitología, Universidad de La Laguna, Islas Canarias, Tenerife, Spain
| | - Lizbeth Salazar-Villatoro
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de Mexico 07360, Mexico
| | - Maritza Omaña-Molina
- Facultad de Estudios Superiores Iztacala, Medicina, Universidad Nacional Autónoma de México (UNAM), Tlalnepantla 54090, Mexico
| | - David Tejedor
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas, Avda. Fco. Sánchez 3, 38206 La Laguna, Islas Canarias, Tenerife, Spain.
| | - Fernando García-Tellado
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas, Avda. Fco. Sánchez 3, 38206 La Laguna, Islas Canarias, Tenerife, Spain
| | - Jacob Lorenzo-Morales
- Instituto Universitario de Enfermedades Tropicales y Salud Pública de Canarias, Universidad de La Laguna, Avda. Astrofísico Fco. Sánchez, S/N, 38203 La Laguna, Islas Canarias, Tenerife, Spain; Departamento de Obstetricia y Ginecología, Pediatría, Medicina Preventiva y Salud Pública, Toxicología, Medicina Legal y Forense y Parasitología, Universidad de La Laguna, Islas Canarias, Tenerife, Spain; CIBER de Enfermedades Infecciosas (CIBERINFEC), Instituto de Salud Carlos III, 28029 Madrid, Spain.
| | - José E Piñero
- Instituto Universitario de Enfermedades Tropicales y Salud Pública de Canarias, Universidad de La Laguna, Avda. Astrofísico Fco. Sánchez, S/N, 38203 La Laguna, Islas Canarias, Tenerife, Spain; Departamento de Obstetricia y Ginecología, Pediatría, Medicina Preventiva y Salud Pública, Toxicología, Medicina Legal y Forense y Parasitología, Universidad de La Laguna, Islas Canarias, Tenerife, Spain; CIBER de Enfermedades Infecciosas (CIBERINFEC), Instituto de Salud Carlos III, 28029 Madrid, Spain.
| |
Collapse
|
2
|
Abstract
Melanoma accounts for 1.7% of global cancer diagnoses and is the fifth most common cancer in the US. Melanoma incidence is rising in developed, predominantly fair-skinned countries, growing over 320% in the US since 1975. However, US mortality has fallen almost 30% over the past decade with the approval of 10 new targeted or immunotherapy agents since 2011. Mutations in the signaling-protein BRAF, present in half of cases, are targeted with oral BRAF/MEK inhibitor combinations, while checkpoint inhibitors are used to restore immunosurveillance likely inactivated by UV radiation. Although the overall 5-year survival has risen to 93.3% in the US, survival for stage IV disease remains only 29.8%. Melanoma is most common in white, older men, with an average age of diagnosis of 65. Outdoor UV exposure without protection is the main risk factor, although indoor tanning beds, immunosuppression, family history and rare congenital diseases, moles, and obesity contribute to the disease. Primary prevention initiatives in Australia implemented since 1988, such as education on sun-protection, have increased sun-screen usage and curbed melanoma incidence, which peaked in Australia in 2005. In the US, melanoma incidence is not projected to peak until 2022-2026. Fewer than 40% of Americans report practicing adequate protection (sun avoidance from 10 a.m.-4 p.m. and regular application of broad-spectrum sunscreen with an SPF > 30). A 2-4-fold return on investment is predicted for a US sun-protection education initiative. Lesion-directed skin screening programs, especially for those at risk, have also cost-efficiently reduced melanoma mortality.
Collapse
Affiliation(s)
- Kalyan Saginala
- Plains Regional Medical Group Internal Medicine, Clovis, NM 88101, USA;
| | - Adam Barsouk
- Hillman Cancer Center, University of Pittsburgh, Pittsburgh, PA 15232, USA;
| | - John Sukumar Aluru
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02212, USA;
| | | | | |
Collapse
|
3
|
Sanchez JN, Subramanian C, Chanda M, Gary S, Zhang N, Wang T, Timmermann BN, Blagg BS, Cohen MS. A novel C-terminal Hsp90 inhibitor KU758 synergizes efficacy in combination with BRAF or MEK inhibitors and targets drug-resistant pathways in BRAF-mutant melanomas. Melanoma Res 2021; 31:197-207. [PMID: 33904516 PMCID: PMC10565508 DOI: 10.1097/cmr.0000000000000734] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Melanoma remains the most aggressive and fatal form of skin cancer, despite several FDA-approved targeted chemotherapies and immunotherapies for use in advanced disease. Of the 100 350 new patients diagnosed with melanoma in 2020 in the US, more than half will develop metastatic disease leading to a 5-year survival rate <30%, with a majority of these developing drug-resistance within the first year of treatment. These statistics underscore the critical need in the field to develop more durable therapeutics as well as those that can overcome chemotherapy-induced drug resistance from currently approved agents. Fortunately, several of the drug-resistance pathways in melanoma, including the proteins in those pathways, rely in part on Hsp90 chaperone function. This presents a unique and novel opportunity to simultaneously target multiple proteins and drug-resistant pathways in this disease via molecular chaperone inhibition. Taken together, we hypothesize that our novel C-terminal Hsp90 inhibitor, KU758, in combination with the current standard of care targeted therapies (e.g. vemurafenib and cobimetinib) can both synergize melanoma treatment efficacy in BRAF-mutant tumors, as well as target and overcome several major resistance pathways in this disease. Using in vitro proliferation and protein-based Western Blot analyses, our novel inhibitor, KU758, potently inhibited melanoma cell proliferation (without induction of the heat shock response) in vitro and synergized with both BRAF and MEK inhibitors in inhibition of cell migration and protein expression from resistance pathways. Overall, our work provides early support for further translation of C-terminal Hsp90 inhibitor and mitogen-activated protein kinase pathway inhibitor combinations as a novel therapeutic strategy for BRAF-mutant melanomas.
Collapse
Affiliation(s)
- Jackee N. Sanchez
- Department of Pharmacology, University of Michigan, Ann Arbor, Michigan
| | | | - Monica Chanda
- Department of Pharmacology, University of Michigan, Ann Arbor, Michigan
| | - Shanguan Gary
- Department of Surgery, University of Michigan, Ann Arbor, Michigan
| | - Nina Zhang
- Department of Surgery, University of Michigan, Ann Arbor, Michigan
| | - Ton Wang
- Department of Surgery, University of Michigan, Ann Arbor, Michigan
| | | | - Brian S.J. Blagg
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana
| | - Mark S. Cohen
- Department of Pharmacology, University of Michigan, Ann Arbor, Michigan
- Department of Surgery, University of Michigan, Ann Arbor, Michigan
| |
Collapse
|
4
|
Nailwal NP, Doshi GM. Role of intracellular signaling pathways and their inhibitors in the treatment of inflammation. Inflammopharmacology 2021; 29:617-640. [PMID: 34002330 DOI: 10.1007/s10787-021-00813-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Accepted: 04/24/2021] [Indexed: 12/11/2022]
Abstract
Inflammation is not only a defense mechanism of the innate immune system against invaders, but it is also involved in the pathogenesis of many diseases such as atherosclerosis, thrombosis, diabetes, epilepsy, and many neurodegenerative disorders. The World Health Organization (WHO) reports worldwide estimates of people (9.6% in males and 18.0% in females) aged over 60 years, suffering from symptomatic osteoarthritis, and around 339 million suffering from asthma. Other chronic inflammatory diseases, such as ulcerative colitis and Crohn's disease are also highly prevalent. The existing anti-inflammatory agents, both non-steroidal and steroidal, are highly effective; however, their prolonged use is marred by the severity of associated side effects. A holistic approach to ensure patient compliance requires understanding the pathophysiology of inflammation and exploring new targets for drug development. In this regard, various intracellular cell signaling pathways and their signaling molecules have been identified to be associated with inflammation. Therefore, chemical inhibitors of these pathways may be potential candidates for novel anti-inflammatory drug approaches. This review focuses on the anti-inflammatory effect of these inhibitors (for JAK/STAT, MAPK, and mTOR pathways) describing their mechanism of action through literature search, current patents, and molecules under clinical trials.
Collapse
Affiliation(s)
- Namrata P Nailwal
- Department of Pharmacology, SVKM's Dr. Bhanuben Nanavati College of Pharmacy, Mithibai Campus, Vile Parle (W), V. M. Road, 400056, Mumbai, India
| | - Gaurav M Doshi
- Department of Pharmacology, SVKM's Dr. Bhanuben Nanavati College of Pharmacy, Mithibai Campus, Vile Parle (W), V. M. Road, 400056, Mumbai, India.
| |
Collapse
|
5
|
Ramtohul P, Denis D, Comet A. Kinetics of Punctate Subretinal Deposits in Mitogen-Activated Protein/Extracellular Signal-Regulated Kinase Inhibitor-Associated Retinopathy Using En Face Optical Coherence Tomography. Retina 2021; 41:e40-e41. [PMID: 33887748 PMCID: PMC8078124 DOI: 10.1097/iae.0000000000003143] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
6
|
Mincu RI, Mahabadi AA, Michel L, Mrotzek SM, Schadendorf D, Rassaf T, Totzeck M. Cardiovascular Adverse Events Associated With BRAF and MEK Inhibitors: A Systematic Review and Meta-analysis. JAMA Netw Open 2019; 2:e198890. [PMID: 31397860 PMCID: PMC6692687 DOI: 10.1001/jamanetworkopen.2019.8890] [Citation(s) in RCA: 79] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
IMPORTANCE Cardiovascular adverse events (CVAEs) after treatment with BRAF and MEK inhibitors in patients with melanoma remain incompletely characterized. OBJECTIVE To determine the association of BRAF and MEK inhibitor treatment with CVAEs in patients with melanoma compared with BRAF inhibitor monotherapy. DATA SOURCES PubMed, Cochrane, and Web of Science were systematically searched for keywords vemurafenib, dabrafenib, encorafenib, trametinib, binimetinib, and cobinimetinib from database inception through November 30, 2018. STUDY SELECTION Randomized clinical trials reporting on CVAEs in patients with melanoma being treated with BRAF and MEK inhibitors compared with patients with melanoma being treated with BRAF inhibitor monotherapy were selected. DATA EXTRACTION AND SYNTHESIS Data assessment followed the Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) guidelines. Pooled relative risks (RRs) and 95% CIs were determined using random-effects and fixed-effects analyses. Subgroup analyses were conducted to assess study-level characteristics associated with CVAEs. MAIN OUTCOMES AND MEASURES The selected end points were pulmonary embolism, a decrease in left ventricular ejection fraction, arterial hypertension, myocardial infarction, atrial fibrillation, and QTc interval prolongation. All-grade and high-grade (≥3) CVAEs were recorded. RESULTS Overall, 5 randomized clinical trials including 2317 patients with melanoma were selected. Treatment with BRAF and MEK inhibitors was associated with an increased risk of pulmonary embolism (RR, 4.36; 95% CI, 1.23-15.44; P = .02), a decrease in left ventricular ejection fraction (RR, 3.72; 95% CI, 1.74-7.94; P < .001), and arterial hypertension (RR, 1.49; 95% CI, 1.12-1.97; P = .005) compared with BRAF inhibitor monotherapy. The RRs for myocardial infarction, atrial fibrillation, and QTc prolongation were similar between the groups. These results were consistent when assessing high-grade CVAEs (left ventricular ejection fraction: RR, 2.79; 95% CI, 1.36-5.73; P = .005; I2 = 29%; high-grade arterial hypertension: RR, 1.54; 95% CI, 1.14-2.08; P = .005; I2 = 0%), but RRs for high-grade pulmonary embolism were similar between groups. A higher risk of a decrease in left ventricular ejection fraction was associated with patients with a mean age younger than 55 years (RR, 26.50; 95% CI, 3.58-196.10; P = .001), and the associated risk of pulmonary embolism was higher for patients with a mean follow-up time longer than 15 months (RR, 7.70; 95% CI, 1.40-42.12; P = .02). CONCLUSIONS AND RELEVANCE Therapy with BRAF and MEK inhibitors was associated with a higher risk of CVAEs compared with BRAF inhibitor monotherapy. The findings may help to balance between beneficial melanoma treatment and cardiovascular morbidity and mortality.
Collapse
Affiliation(s)
- Raluca I. Mincu
- West German Heart and Vascular Center, Department of Cardiology and Vascular Medicine, University Hospital Essen, Essen, Germany
| | - Amir A. Mahabadi
- West German Heart and Vascular Center, Department of Cardiology and Vascular Medicine, University Hospital Essen, Essen, Germany
| | - Lars Michel
- West German Heart and Vascular Center, Department of Cardiology and Vascular Medicine, University Hospital Essen, Essen, Germany
| | - Simone M. Mrotzek
- West German Heart and Vascular Center, Department of Cardiology and Vascular Medicine, University Hospital Essen, Essen, Germany
| | - Dirk Schadendorf
- West German Cancer Center, Department of Dermatology, University Hospital Essen, Essen, Germany
| | - Tienush Rassaf
- West German Heart and Vascular Center, Department of Cardiology and Vascular Medicine, University Hospital Essen, Essen, Germany
| | - Matthias Totzeck
- West German Heart and Vascular Center, Department of Cardiology and Vascular Medicine, University Hospital Essen, Essen, Germany
| |
Collapse
|
7
|
Januszewicz W, Corrie P, Liu H, Chan J, Fitzgerald RC, di Pietro M. A sinister black finding in the stomach. Lancet 2019; 393:1149. [PMID: 30894270 DOI: 10.1016/s0140-6736(19)30423-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 11/02/2018] [Accepted: 02/15/2019] [Indexed: 12/21/2022]
Affiliation(s)
- Wladyslaw Januszewicz
- MRC Cancer Unit, University of Cambridge, Cambridge, UK; Department of Gastroenterology, Hepatology and Clinical Oncology, Medical Centre for Postgraduate Education, Warsaw, Poland
| | - Pippa Corrie
- Cambridge Cancer Centre, Cambridge University Hospitals NHS Foundation Trust and Cambridge University Medical School, Cambridge, UK
| | - Hongxiang Liu
- Department of Histopathology, Cambridge University Hospitals NHS Foundation Trust and Cambridge University Medical School, Cambridge, UK
| | - James Chan
- Department of Histopathology, Cambridge University Hospitals NHS Foundation Trust and Cambridge University Medical School, Cambridge, UK
| | | | | |
Collapse
|
8
|
Min MS, Yao J, Chee N, Sapadin AN, Shim-Chang H. Xanthogranulomatous reaction to trametinib for metastatic malignant melanoma. Cutis 2018; 102:283-286. [PMID: 30489553] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Trametinib, a mitogen-activated extracellular signal-regulated kinase (MEK) inhibitor, has demonstrated great promise in treating metastatic melanoma associated with BRAF V600E and V600K mutations; however, it also is highly associated with cutaneous adverse events (AEs). As both BRAF and MEK inhibitors become increasingly used to treat malignant melanoma, it is important to better characterize these AEs so that we can manage them. Herein, we present a case of a 66-year-old man who developed erythematous scaly papules on the face and bilateral upper extremities after beginning therapy with trametinib. The severity of the reaction worsened on trametinib monotherapy compared to combination therapy with a BRAF inhibitor. Biopsy revealed a xanthogranulomatous reaction.
Collapse
Affiliation(s)
- Michelle S Min
- Department of Dermatology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | | | - Nicole Chee
- New York University, New York, New York, USA
| | - Allen N Sapadin
- Department of Dermatology, Hackensack University Medical Center, New Jersey, USA
| | - Helen Shim-Chang
- Department of Dermatology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| |
Collapse
|
9
|
Johnson D. Is there a role for single-agent MEK inhibition in melanoma? Clin Adv Hematol Oncol 2016; 14:976-978. [PMID: 28212360 PMCID: PMC6643955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
|
10
|
Nakayama H, Desrivot J, Bories C, Franck X, Figadère B, Hocquemiller R, Fournet A, Loiseau PM. In vitro and in vivo antileishmanial efficacy of a new nitrilquinoline against Leishmania donovani. Biomed Pharmacother 2007; 61:186-8. [PMID: 17360145 DOI: 10.1016/j.biopha.2007.02.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2006] [Revised: 07/07/2006] [Indexed: 11/26/2022] Open
Abstract
The in vitro activity of a new analogue of 2-alkenylquinoline (2-nitrilquinoline or NQ) against Leishmania donovani was compared to oral reference drug miltefosine (HePC). IC(50) of NQ was found at 38.6 microM against promastigotes and 2.4 microM against intramacrophage amastigotes. In vivo evaluation in the L. donovani Balb/c mice model indicated that oral treatments at 12.5 and 25 mg/kg for 10 consecutive days significantly reduced the parasite burden in the liver by 68.9 and 68.5%, respectively. This activity was similar to those of HePC at 7.5 mg/kg for 10 days which reduced the parasite burden in liver by 72.5%. The present study shows the positive contribution of a nitril substitute being added into the alkenyl chain branched at the 2-position of the quinoline ring to the antileishmanial activity. In addition, any apparent toxicological disorder was observed during the experiments.
Collapse
Affiliation(s)
- H Nakayama
- Department of Tropical Medicine, Casilla de Correo 2511, Instituto de Investigaciones en Ciencias de la Salud Asunción, Universidad Nacional de Asuncion, Asuncion, Paraguay
| | | | | | | | | | | | | | | |
Collapse
|
11
|
Vojvodic D, Jerolimov V, Zabarovic D, Loncar A. Bond strengths of two dental bonding systems. Mil Med 2000; 165:560-5. [PMID: 10920659] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023] Open
Abstract
A new bonding system named Kevloc has been introduced. It is based on acrylization of the metal surface with the goal of preventing the occurrence of a marginal gap between the metal and the resin. The purpose of this investigation was to determine the values of the shear bond strength achieved using the Kevloc technique on Ag-Pd (Auropal SE) and Co-Cr (Basil S) alloys and to compare them with those obtained with the OVS technique. The shear bond strengths were measured with the Smitz-Schulmayer shear test in a universal testing machine for polymer materials. A microscope image analyzer was used to measure the thickness of bonding layers and to reveal the possible occurrence of the marginal gap with both techniques. No marginal gap was detected with either technique. Kevloc provided better results than OVS only in a group of specimens tested after polymerization. Immersion in water and thermocycling reduced the initially high bond strength values of Kevloc specimens, whereas the bond strength values of OVS specimens remained unchanged regardless of which aging treatment was used. Microscopic examination did not reveal the existence of the marginal gap for either bonding system. According to the results obtained, it can be concluded that the Kevloc bonding system does not provide better shearing bond strength than the OVS bonding system.
Collapse
Affiliation(s)
- D Vojvodic
- Clinical Department for Prosthetic Dentistry, School of Dental Medicine, University of Zagreb, Clinical Hospital Dubrava, Croatia
| | | | | | | |
Collapse
|
12
|
Maubon AJ, Thurmond AS, Laurent A, Machan LS, Scanlan RM, Nikolchev J, Rouanet JP. Tubal sterilization by means of selective catheterization: comparison of a hydrogel and a collagen glue. J Vasc Interv Radiol 1996; 7:733-6. [PMID: 8897343 DOI: 10.1016/s1051-0443(96)70841-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [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] [Indexed: 02/02/2023] Open
Abstract
PURPOSE To test, in an animal model, two potentially suitable materials for nonsurgical selective tubal sterilization. MATERIALS AND METHODS A hydrogel that forms an in situ plug by phase inversion of a polymer solution was placed in four rabbit fallopian tubes, and a proprietary collagen glue was placed into three rabbit fallopian tubes by means of transvaginal fluoroscopic fallopian tube catheterization. As controls, 11 tubes were catheterized without sterilization material injection. The rabbits were bred, and the presence of embryos was confirmed with palpation and at autopsy. Histologic analysis was performed. RESULTS The short-term contraception rate was 100% in the hydrogel group, 33% in the collagen glue group, and 0% in the control group (P < .001 hydrogel group, P not significant in collagen group). Inflammation was minimal in the three groups (P not significant). CONCLUSION The collagen glue had an insufficient contraceptive effect and should be abandoned. The hydrogel used proved effective and biocompatible, and long-term studies of this compound are warranted.
Collapse
Affiliation(s)
- A J Maubon
- Department of Radiology, Centre Medico-chirurgical Beausoleil, Montpellier, France
| | | | | | | | | | | | | |
Collapse
|
13
|
Falkenhagen D, Brown GS, Thomaneck U, Levin NW, Ivanovich P, Bergstrom J, Kishimoto T, Klinkmann H. Behaviour of white blood cells and the complement system. Nephrol Dial Transplant 1993; 8 Suppl 2:8-14. [PMID: 8272252 DOI: 10.1093/ndt/8.supp2.8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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: 01/29/2023] Open
Abstract
Seven different types of dialysers were investigated in five dialysis centres in four countries with respect to behaviour of white blood cells and the complement system. The results of this controlled crossover study demonstrated significant differences in the dialysers. Those containing cuprammonium cellulose (G10-3N and G120 M) showed the greatest changes in white blood cell count, including monocytes and neutrophils, as well as the greatest complement activation. With regard to lymphocytes the subpopulation of low-mobility cells, which were predominantly the B-cells, showed the greatest mobility with dialysers containing cuprammonium cellulose. The PAN copolymer- and PMMA-containing dialysers Filtral and T 150 clearly caused the least changes in white blood cells and complement factors. Dialysers containing cellulose acetate and polysulphone membranes (Duo-Flux Artificial Kidney, CD 4000, and F 60) produced only a moderate decrease of WBC, monocyte, neutrophil, and lymphocyte counts, and this result corresponded to a relatively small change in complement factors.
Collapse
Affiliation(s)
- D Falkenhagen
- Department of Internal Medicine, University of Rostock, Germany
| | | | | | | | | | | | | | | |
Collapse
|
14
|
Hornemann M, Raptis G. [Therapy of varicose ulcer using crilanomer and dextranomer]. Z Hautkr 1987; 62:41-51. [PMID: 2437713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
148 patients with leg ulcers were treated in 14 clinics with Clinagel or with Debrisan Paste for four weeks. The size of the surface of the ulcer and the overall evaluation of the ulcer by physician before and after treatment were the most important criteria for the assessment of efficacy. The comparison between the two treatments was carried out by t- and x2-test at the level of a = 0.05. Clinagel was shown to be better than Debrisan. Its superiority was statistically significant in regard to reduction of area, depth, pain and swelling, increase of granulation tissue, reepithelialisation of ulcer and the subjective judgement of physician and patient. No systemic side effects were observed in any of the patients and only slight local side effects were registered.
Collapse
|
15
|
De Paepe M, Ringoir S. Evaluation of hemofiltration with different AN 69 membrane devices using a discontinuous flow-single needle system. Int J Artif Organs 1982; 5:87-91. [PMID: 7095885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Unipuncture hemofiltration using the double headed pump (Bellco BL 760) was performed in a patient who acted as her own control for 10 sessions with a 1.0 m2 AN69 membrane (group A), 10 sessions with a 1.4 m2 AN69 membrane (group B) and 10 sessions with a 1.0 m2 AN69 membrane Filtral (group C). A two needle standard hemofiltration technique (Hemoprocessor Sartorius) was used in this patient for 10 sessions with a 1.0 m2 AN69 membrane (group D). To obtain the same amount of ultrafiltration fluid the filtration time was respectively 266, 196, 214 and 260 minutes in groups A, B, C and D.
Collapse
|
16
|
Polyacrylonitrile membrane dialysis for hepatic coma. Lancet 1977; 2:451-2. [PMID: 70659] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
17
|
Vantelon J, Lauriat F, Perrone B, Jeannot F. [Is it possible to treat uremia by hemofiltration? Initial clinical results obtained with a poly-acrylo-nytril membrane]. Nouv Presse Med 1977; 6:1117-20. [PMID: 850622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Following to work of Quellhorst, the authors used an RP6 haemodialyser as an ultrafilter and exchanged 20 litres of plasma ultrafiltrate against 18 to 20 litres of physiological solution during 200 sessions of 4 to 5 hours in 5 patients with uraemia, over a period of 3 to 10 months. The technique is simple and tolerance excellent. The possibility of a new approach to the treatment of uraemia without dialysate makes a large clinical trial worthwhile.
Collapse
|