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Tamartash Z, Javinani A, Pehlivan Y, Coskun BN, Yekta RA, Dalkilic E, Yağız B, Khavandgar N, Pournazari M, Hajiabbasi A, Sakar O, Zayeni H, Masoleh IS, Shakibi MR, Yazdi F, Mahmoudi M, Masoumi M, Mohammadzadegan AM, Sima F, Salehi S, Faezi ST, Jamshidi AR, Kavosi H. Comparison of clinicodemographic characteristics and pattern of vascular involvement in 126 patients with Takayasu arteritis: a report from Iran and Turkey. Reumatismo 2022; 74. [PMID: 36580066 DOI: 10.4081/reumatismo.2022.1487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 10/11/2022] [Indexed: 12/30/2022] Open
Abstract
Takayasu arteritis (TA) is an extremely uncommon vasculitis that primarily affects the aorta and its branches. Due to the genetic and ethnicity effect, a diverse array of TA clinical manifestations has been reported worldwide. The purpose of the present study was to compare the clinicodemographic characteristics and pattern of vascular involvement of Iranian and Turkish TA patients. This study was a retrospective, cross-sectional investigation of 126 TA patients in Iran and Turkey. All of the variables analyzed were extracted from historical medical records. In 126 TA patients, the ratio of females to males was 8.6:1, and the average age at onset of disease was 30.5±11.1 years. Fatigue (49.2%) and a weak or absent pulse (79.4%) were the most prevalent symptoms and signs, respectively. The most prevalent angiographic classifications were types V and I in Iranian patients (41.09%) and type I in the Turkish population (47.7%) The left subclavian artery was the vessel most frequently affected by TA (66.6%). Our findings indicated that there were no significant differences between the two countries in terms of clinicodemographic characteristics or vascular involvement. Some clinical manifestations, such as claudication, were more prevalent in the Turkish population due to a higher incidence of occlusive lesions in the right subclavian artery.
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Affiliation(s)
- Z Tamartash
- Rheumatology Research Center, Tehran University of Medical Sciences, Tehran.
| | - A Javinani
- Rheumatology Research Center, Tehran University of Medical Sciences, Tehran.
| | - Y Pehlivan
- Department of Rheumatology, Uludag University, Bursa.
| | - B N Coskun
- Department of Rheumatology, Uludag University, Bursa.
| | - R A Yekta
- Anesthesiology Department, Shariati Hospital, Tehran University of Medical Sciences, Tehran.
| | - E Dalkilic
- Department of Rheumatology, Uludag University, Bursa.
| | - B Yağız
- Department of Rheumatology, Uludag University, Bursa.
| | - N Khavandgar
- Rheumatology Research Center, Tehran University of Medical Sciences, Tehran.
| | - M Pournazari
- Clinical Research Development Center, Imam Reza Hospital, Kermanshah University of Medical Sciences, Kermanshah.
| | - A Hajiabbasi
- Department of Rheumatology, Guilan Rheumatology Research Center, Razi Hospital, School of Medicine, Guilan University of Medical Sciences, Rasht.
| | - O Sakar
- Department of Internal Medicine, Uludag University, Bursa.
| | - H Zayeni
- Department of Rheumatology, Guilan Rheumatology Research Center, Razi Hospital, School of Medicine, Guilan University of Medical Sciences, Rasht.
| | - I S Masoleh
- Department of Rheumatology, Guilan Rheumatology Research Center, Razi Hospital, School of Medicine, Guilan University of Medical Sciences, Rasht.
| | - M R Shakibi
- Endocrinology and Metabolism Research Center, Institute of Basic and Clinical Physiology Sciences, Kerman University of Medical Sciences, Kerman.
| | - F Yazdi
- Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman.
| | - M Mahmoudi
- Rheumatology Research Center, Tehran University of Medical Sciences, Tehran.
| | - M Masoumi
- Clinical Research Development Center, Qom University of Medical Sciences, Qom.
| | - A M Mohammadzadegan
- Rheumatology Research Center, Tehran University of Medical Sciences, Tehran.
| | - F Sima
- Rheumatology Research Center, Tehran University of Medical Sciences, Tehran.
| | - S Salehi
- Rheumatology Research Center, Tehran University of Medical Sciences, Tehran.
| | - S T Faezi
- Rheumatology Research Center, Tehran University of Medical Sciences, Tehran.
| | - A R Jamshidi
- Rheumatology Research Center, Tehran University of Medical Sciences, Tehran.
| | - H Kavosi
- Rheumatology Research Center, Tehran University of Medical Sciences, Tehran.
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Salehi S, Berk SA, Brunelli R, Cotner S, Creech C, Drake AG, Fagbodun S, Hall C, Hebert S, Hewlett J, James AC, Shuster M, St. Juliana JR, Stovall DB, Whittington R, Zhong M, Ballen CJ. Context Matters: Social Psychological Factors That Underlie Academic Performance across Seven Institutions. CBE Life Sci Educ 2021; 20:ar68. [PMID: 34767460 PMCID: PMC8715787 DOI: 10.1187/cbe.21-01-0012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 09/15/2021] [Accepted: 09/29/2021] [Indexed: 06/13/2023]
Abstract
To enhance equity and diversity in undergraduate biology, recent research in biology education focuses on best practices that reduce learning barriers for all students and improve academic performance. However, the majority of current research into student experiences in introductory biology takes place at large, predominantly White institutions. To foster contextual knowledge in biology education research, we harnessed data from a large research coordination network to examine the extent of academic performance gaps based on demographic status across institutional contexts and how two psychological factors, test anxiety and ethnicity stigma consciousness, may mediate performance in introductory biology. We used data from seven institutions across three institution types: 2-year community colleges, 4-year inclusive institutions (based on admissions selectivity; hereafter, inclusive), and 4-year selective institutions (hereafter, selective). In our sample, we did not observe binary gender gaps across institutional contexts, but found that performance gaps based on underrepresented minority status were evident at inclusive and selective 4-year institutions, but not at community colleges. Differences in social psychological factors and their impacts on academic performance varied substantially across institutional contexts. Our findings demonstrate that institutional context can play an important role in the mechanisms underlying performance gaps.
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Affiliation(s)
- S. Salehi
- Graduate School of Education, Stanford University, Stanford, CA 94305
| | - S. A. Berk
- Department of Biological Sciences, Auburn University, Auburn, AL 36849
| | - R. Brunelli
- Biological Sciences Department, California State University, Chico, Chico, CA 95929
| | - S. Cotner
- Department of Biology Teaching and Learning, University of Minnesota, Minneapolis, MN 55455
| | - C. Creech
- Department of Biology, Mt. Hood Community College, Gresham, OR 97030
| | - A. G. Drake
- College of Arts and Sciences, Cornell University, Ithaca, NY 14853
| | - S. Fagbodun
- Biology Department, Tuskegee University, Tuskegee, AL 36088
| | - C. Hall
- Department of Biological Sciences, University of New Hampshire, Durham, NH 03824
| | - S. Hebert
- Department of Biology Teaching and Learning, University of Minnesota, Minneapolis, MN 55455
| | - J. Hewlett
- Department of Science and Technology, Finger Lakes Community College, Canandaigua, NY 14424
| | - A. C. James
- Department of Biology, New Mexico State University, Las Cruces, NM 88003
| | - M. Shuster
- Department of Biology, New Mexico State University, Las Cruces, NM 88003
| | | | - D. B. Stovall
- College of Arts and Sciences, Winthrop University, Rock Hill, SC 29733
| | - R. Whittington
- Biology Department, Tuskegee University, Tuskegee, AL 36088
| | - M. Zhong
- Department of Biological Sciences, Auburn University, Auburn, AL 36849
| | - C. J. Ballen
- Department of Biological Sciences, Auburn University, Auburn, AL 36849
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Aigner T, Haynl C, Salehi S, O'Connor A, Scheibel T. Nerve guidance conduit design based on self-rolling tubes. Mater Today Bio 2020; 5:100042. [PMID: 32159159 PMCID: PMC7063334 DOI: 10.1016/j.mtbio.2020.100042] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [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] [Received: 10/21/2019] [Revised: 01/17/2020] [Accepted: 01/18/2020] [Indexed: 12/29/2022] Open
Abstract
The current gold standard in peripheral nerve repair is nerve autografts for bridging gaps larger than a centimeter. However, autografts are associated with a low availability and the loss of function at the donor site. Nerve guidance conduits (NGCs) made of biocompatible and biodegradable materials reflect suitable alternatives. Clinically approved NGCs comprise either wraps that are rolled around the loose ends of the nerve or steady-state tubes; however, both lack internal guidance structures. Here, we established self-rolling NGCs to allow for gentle encapsulation of nerve cells together with supportive microenvironments, such as (1) an inner tube wall coating with a bioactive spider silk film, (2) an inner tube wall lining using an anisotropic spider silk non-woven mat, or (3) a luminal filler using an anisotropic collagen cryogel. Neuronal cells adhered and differentiated inside the modified tubes and formed neurites, which were oriented along the guidance structures provided by the spider silk non-woven mat or by the fibrillary structure of the collagen cryogel. Thus, our size-adaptable NGCs provide several features useful for peripheral nerve repair, and distinct combinations of the used elements might support and enhance the clinical outcome.
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Affiliation(s)
- T.B. Aigner
- University of Bayreuth, Department of Biomaterials, Prof.-Rüdiger-Bormann-Str.1, 95447, Bayreuth, Germany
| | - C. Haynl
- University of Bayreuth, Department of Biomaterials, Prof.-Rüdiger-Bormann-Str.1, 95447, Bayreuth, Germany
| | - S. Salehi
- University of Bayreuth, Department of Biomaterials, Prof.-Rüdiger-Bormann-Str.1, 95447, Bayreuth, Germany
| | - A. O'Connor
- University of Melbourne, Department of Biomedical Engineering, Melbourne, Victoria, 3010, Australia
| | - T. Scheibel
- University of Bayreuth, Department of Biomaterials, Prof.-Rüdiger-Bormann-Str.1, 95447, Bayreuth, Germany
- University of Bayreuth, Bayreuther Zentrum für Kolloide und Grenzflächen (BZKG), Universitätsstraße 30, 95447, Bayreuth, Germany
- University of Bayreuth, Bayreuther Zentrum für Molekulare Biowissenschaften (BZMB), Universitätsstraße 30, 95447, Bayreuth, Germany
- University of Bayreuth, Bayreuther Materialzentrum (BayMAT), Universitätsstraße 30, 95447, Bayreuth, Germany
- University of Bayreuth, Bayerisches Polymerinstitut (BPI), Universitätsstraße 30, 95447, Bayreuth, Germany
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Mirjalili SMM, Hashemipour S, Salehi S, Kazemifar AM, Madani PS. Thyroid metastasis of bladder transitional cell carcinoma. Malays J Pathol 2016; 38:65-70. [PMID: 27126668] [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: 06/05/2023]
Abstract
The thyroid gland is a rare site for cancer metastasis. We report a 75-year-old man who was referred with a history of hematuria and generalized bone pain for the past few months. He had a past history of partial left lobe thyroidectomy for follicular adenoma. Subsequently he was referred for a thyroid mass and a subtotal thyroidectomy showed a poorly-differentiated carcinoma. On the latest admission, the patient underwent resection of a bladder tumour with malignant histology and an immunohistochemical profile of CK7+/CK20+/34 Beta E12+/CEA-/PSA-. Re-examination of thyroid sections with immunohistochemical stains revealed the malignant cells to be CK7+/CK20+/34 Beta E12+/CEA-/TTF1-. The findings were compatible with metastasis of the bladder transitional cell carcinoma to the thyroid gland.Scans revealed multiple liver and bone metastases. The patient died 2 months after the diagnosis.
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Salehi S, Cooper P, Smith A, Ferracane J. Dentin matrix components extracted with phosphoric acid enhance cell proliferation and mineralization. Dent Mater 2016; 32:334-42. [PMID: 26777093 DOI: 10.1016/j.dental.2015.11.004] [Citation(s) in RCA: 28] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 11/07/2015] [Accepted: 11/20/2015] [Indexed: 01/28/2023]
Abstract
OBJECTIVE Acids, such as those used in adhesive dentistry, have been shown to solubilize bioactive molecules from dentin. These dentin matrix components (DMC) may promote cell proliferation and differentiation, and ultimately contribute to dentin regeneration. The objective of this study was to evaluate the potential for varying concentrations of DMC extracted from human dentin by phosphoric acid of a range of pHs to stimulate proliferation and mineralization of two different cultured pulp cell populations. METHODS DMC were solubilized from powdered human dentin (7 days - 4°C) by phosphoric acid of pH 1, 3, and 5 and also, EDTA. Extracts were dialyzed for 7 days against distilled water and lyophilized. Undifferentiated mouse dental pulp cells (OD-21) and cells of the odontoblast-like cell line (MDPC-23) were seeded in six-well plates (1×10(5)) and cultured for 24h in DMEM (Dulbecco's modified Eagle's medium) containing 10% (v/v) FBS (fetal bovine serum). The cells were washed with serum-free medium and then treated with different concentrations of DMC (0.01, 0.1, 1.0 and 10.0μg/ml) daily in serum free medium for 7 days. After 3, 5 (MDPC-23 only), and 7 days of treatment, cell proliferation was measured using 10vol% Alamar blue solution, which was added to each well for 1h. Cell numbers were first measured by cell counting (Trypan blue; n=5) and Alamar blue fluorescence to validate the assay, which was then used for the subsequent assessments of proliferation. Mineralization was assessed by Alizarin Red S assay after 12 days exposure to DMC (n=5). Controls were media-only (DMEM) and dexamethasone (DEX; positive control). Results were analysed by ANOVA/Tukey's (p≤0.05). RESULTS There was a linear correlation between cell counts and Alamar blue fluorescence (R(2)>0.96 for both cell types) , verifying the validity of the Alamar blue assay for these cell types. In general, there was a dose-dependent trend for enhanced cell proliferation with higher concentration of DMC for both cell lines, especially at 10.0μg/ml. DEX exposure resulted in significantly higher mineralization, but did not affect cell proliferation. DMC exposure demonstrated significantly greater mineralization than media-only control for 10μg/ml for all extracts, and at lower concentrations for EDTA and pH 5 extracts. SIGNIFICANCE Human dentin matrix components solubilized by acids at pH levels found in commercial dentin adhesives enhanced cell proliferation and mineralization of mouse and rat undifferentiated dental pulp cells when presented in adequate concentration.
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Affiliation(s)
- Satin Salehi
- Department of Restorative Dentistry, Division of Biomaterials and Biomechanics, Oregon Health & Science University, Portland, OR 97201, USA
| | - Paul Cooper
- Oral Biology, School of Dentistry, University of Birmingham, Birmingham B4 6NN, United Kingdom
| | - Anthony Smith
- Oral Biology, School of Dentistry, University of Birmingham, Birmingham B4 6NN, United Kingdom
| | - Jack Ferracane
- Department of Restorative Dentistry, Division of Biomaterials and Biomechanics, Oregon Health & Science University, Portland, OR 97201, USA.
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Hyun HK, Salehi S, Ferracane JL. Biofilm formation affects surface properties of novel bioactive glass-containing composites. Dent Mater 2015; 31:1599-608. [PMID: 26590029 DOI: 10.1016/j.dental.2015.10.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [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: 02/25/2015] [Revised: 06/01/2015] [Accepted: 10/22/2015] [Indexed: 11/28/2022]
Abstract
OBJECTIVES This study investigated the effects of bacterial biofilm on the surface properties of novel bioactive glass (BAG)-containing composites of different initial surface roughness. METHODS BAG (65 mol% Si; 4% P; 31% Ca) and BAG-F (61% Si; 31% Ca; 4% P; 3% F; 1% B) were synthesized by the sol-gel method and micronized (size ∼0.1-10 μm). Composites with 72wt% total filler load were prepared by replacing 15% of the silanized Sr glass with BAG, BAG-F, or silanized silica. Specimens (n=10/group) were light-cured and divided into 4 subgroups of different surface roughness by wet polishing with 600 and then up to 1200, 2400, or 4000 grit SiC. Surface roughness (SR), gloss, and Knoop microhardness were measured before and after incubating in media with or without a Streptococcus mutans (UA 159) biofilm for 2 weeks. Results were analyzed with ANOVA/Tukey's test (α=0.05). RESULTS The SR of the BAG-containing composites with the smoothest surfaces (2400/4000 grit) increased in media or bacteria; the SR of the roughest composites (600 grit) decreased. The gloss of the smoothest BAG-containing composites decreased in bacteria and media-only, but more in media-alone. The microhardness of all of the composites decreased with exposure to media or bacteria, with BAG-containing composites affected more than the control. SIGNIFICANCE Exposure to bacterial biofilm and its media produced enhanced roughness and reduced gloss and surface microhardness of highly polished dental composites containing a bioactive glass additive, which could affect further biofilm formation, as well as the esthetics, of restorations made from such a material.
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Affiliation(s)
- Hong-Keun Hyun
- Department of Pediatric Dentistry, Dental Research Institute, School of Dentistry, Seoul National University, Seoul National University Dental Hospital, 101, Daehakno, Jongno-gu, Seoul 110-768, Republic of Korea.
| | - Satin Salehi
- Division of Biomaterials and Biomechanics, Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, 2730 S.W. Moody Avenue, Portland, OR 97201, USA.
| | - Jack L Ferracane
- Division of Biomaterials and Biomechanics, Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, 2730 S.W. Moody Avenue, Portland, OR 97201, USA.
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Javadi Parvaneh V, Shiari R, Rahmani K, Mehregan F, Mahboubi L, Salehi S, Yeganeh M. AB1013 Pulse of Methylprednisolone May Reduce the Risk of Renal Involvement in Children with Henoch-Schonlein Purpura. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.5556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Khvostenko D, Salehi S, Naleway SE, Hilton TJ, Ferracane JL, Mitchell JC, Kruzic JJ. Cyclic mechanical loading promotes bacterial penetration along composite restoration marginal gaps. Dent Mater 2015; 31:702-10. [PMID: 25900624 DOI: 10.1016/j.dental.2015.03.011] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [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: 10/11/2014] [Revised: 01/26/2015] [Accepted: 03/24/2015] [Indexed: 10/23/2022]
Abstract
OBJECTIVES Secondary caries is the most common reason for composite restoration replacement and usually forms between dentin and the filling. The objective of this study was to investigate the combined effect of cyclic loading and bacterial exposure on bacterial penetration into gaps at the interface between dentin and resin composite restorative material using a novel bioreactor system and test specimen design. METHODS Human molars were machined into 3mm thick disks with 2mm deep × 5 mm diameter cavity preparations into which composite restorations were placed. A ∼ 15-30 μm (small) or ∼ 300 μm wide (large) marginal gap was introduced along half of the interface between the dentin and restoration. Streptococcus mutans UA 159 biofilms were grown on each sample prior to testing each in a bioreactor both with and without cyclic loading. Both groups of samples were tested for 2 weeks and post-test biofilm viability was confirmed with a live-dead assay. Samples were fixed, mounted and cross-sectioned to reveal the gaps and observe the depth of bacterial penetration. RESULTS It was shown that for large gap samples the bacteria easily penetrated to the full depth of the gap independent of loading or non-loading conditions. The results for all cyclically loaded small gap samples show a consistently deep bacterial penetration down 100% of the gap while the average penetration depth was only 67% for the non-loaded samples with only two of six samples reaching 100%. SIGNIFICANCE A new bioreactor was developed that allows combining cyclic mechanical loading and bacterial exposure of restored teeth for bacterial biofilm and demineralization studies. Cyclic loading was shown to aid bacterial penetration into narrow marginal gaps, which could ultimately promote secondary caries formation.
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Affiliation(s)
- D Khvostenko
- Materials Science, School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, OR, USA
| | - S Salehi
- Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, USA
| | - S E Naleway
- Materials Science, School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, OR, USA
| | - T J Hilton
- Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, USA
| | - J L Ferracane
- Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, USA
| | - J C Mitchell
- College of Dental Medicine, Midwestern University, Glendale, AZ, USA
| | - J J Kruzic
- Materials Science, School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, OR, USA.
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Salehi S, Davis HB, Ferracane JL, Mitchell JC. Sol-gel-derived bioactive glasses demonstrate antimicrobial effects on common oral bacteria. Am J Dent 2015; 28:111-115. [PMID: 26087578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
PURPOSE To determine the antibacterial effect of nano-structured, sol-gel processed bioactive glasses that may be used for implants, coatings, and as adjuncts to dental restorative materials. METHODS Six bioactive glasses (BAG), three made with differing amounts of silica (65, 75 and 85 mole%), and three with different amounts of silica (61, 71, and 81 mole%) and 3 mole% fluoride were prepared by a sol-gel synthesis method and tested against clinically important bacteria species, Streptococcus sobrinus (ATCC33478), Streptococcus mutans (ATCC25175) and Enterococcus faecalis (ATCC19433). Bacterial suspensions were independently incubated with bioactive glass in particulate form (< 3 µm) for 4 and 24 hours. Viability was determined by colony-forming units. RESULTS At 4 hours, all BAG produced an order of magnitude reduction in all three bacteria. After 24 hours, all BAG produced a significant reduction in S. sobrinus colonies, but no further reduction in S. mutans; all BAG, except BAG 61-F, significantly reduced E. faecalis compared to the control. At 4 hours, an increase in the pH of the BAG groups (to pH 9) could also have contributed to the bactericidal effect. In further experiments it was found that the viability of S. sobrinus was significantly reduced following exposure to an extract of BAG in media adjusted to a pH of 7.4. Additionally media with pH adjusted to 9 exerted a significant antibacterial effect against S. sobrinus after 4 hours. To determine the influence of the calcium ions released from the BAG in the absence of the pH effect, a typical dose response was demonstrated after 4 hours of exposure of S. sobrinus to media containing various levels of calcium. The results of this study clearly suggest that the effect of BAG extract on bacteria is not only related to a pH effect, but is also linked to an effect of liberated ions, such as calcium, extracted from the surface of the bioactive glasses.
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Salehi S, Gwinner F, Mitchell JC, Pfeifer C, Ferracane JL. Cytotoxicity of resin composites containing bioactive glass fillers. Dent Mater 2015; 31:195-203. [PMID: 25564110 DOI: 10.1016/j.dental.2014.12.004] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [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] [Received: 04/01/2014] [Revised: 08/18/2014] [Accepted: 12/05/2014] [Indexed: 01/28/2023]
Abstract
OBJECTIVE To determine the in vitro cytotoxicity of dental composites containing bioactive glass fillers. METHODS Dental composites (50:50 Bis-GMA/TEGDMA resin: 72.5wt% filler, 67.5%Sr-glass and 5% OX50) containing different concentrations (0, 5, 10 and 15wt%) of two sol-gel bioactive glasses, BAG65 (65mole% SiO2, 31mole% CaO, 4mole% P2O5) and BAG61 (3mole% F added) were evaluated for cytotoxicity using Alamar Blue assay. First, composite extracts were obtained from 7 day incubations of composites in cell culture medium at 37°C. Undifferentiated pulp cells (OD-21) were exposed to dilutions of the original extracts for 3, 5, and 7 days. Then freshly cured composite disks were incubated with OD-21 cells (n=5) for 2 days. Subsequently, fresh composite disks were incubated in culture medium at 37°C for 7 days, and then the extracted disks were incubated with OD-21 cells for 2 days. Finally, fresh composites disks were light cured for 3, 5, and 20s and incubated with OD-21 cells (n=5) for 1, 3, 5, and 7 days. To verify that the three different curing modes produced different levels of degree of conversion (DC), the DC of each composite was determined by FTIR. Groups (n=5) were compared with ANOVA/Tukey's (α≤0.05). RESULTS Extracts from all composites significantly reduced cell viability until a dilution of 1:8 or lower, where the extract became equal to the control. All freshly-cured composites showed significantly reduced cell viability at two days. However, no reduction in cell viability was observed for any composite that had been previously soaked in media before exposure to the cells. Composites with reduced DC (3s vs. 20s cure), as verified by FTIR, showed significantly reduced cell viability. SIGNIFICANCE The results show that the composites, independent of composition, had equivalent potency in terms of reducing the viability of the cells in culture. Soaking the composites for 7 days before exposing them to the cells suggested that the "toxic" components had been extracted and the materials were no longer cytotoxic. The results demonstrate that the cytotoxicity of composites with and without BAG must predominantly be attributed to the release of residual monomers, and not to the presence of the BAG.
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Affiliation(s)
- Satin Salehi
- Division of Biomaterials and Biomechanics, Department of Restorative, School of Dentistry, Oregon Health Science University, Portland, OR, USA.
| | - Fernanda Gwinner
- Division of Biomaterials and Biomechanics, Department of Restorative, School of Dentistry, Oregon Health Science University, Portland, OR, USA
| | | | - Carmem Pfeifer
- Division of Biomaterials and Biomechanics, Department of Restorative, School of Dentistry, Oregon Health Science University, Portland, OR, USA
| | - Jack L Ferracane
- Division of Biomaterials and Biomechanics, Department of Restorative, School of Dentistry, Oregon Health Science University, Portland, OR, USA
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Faria-E-Silva A, Salehi S, Ferracane J, Pfeifer C. Bacterial adhesion to highly-filled composite containing thio-urethanes. Dent Mater 2015. [DOI: 10.1016/j.dental.2015.08.103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Salehi S, Grünert A, Bahners T, Gutmann J, Steuhl K, Czugala M, Singer B, Fuchsluger T. Eine neue Nanofaser-Matrix für den kornealen Gewebeersatz. Klin Monbl Augenheilkd 2014; 231:626-30. [PMID: 24940761 DOI: 10.1055/s-0034-1368533] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- S. Salehi
- Deutsches Textilforschungszentrum Nord-West gGmbH, Universität Duisburg-Essen, Krefeld
| | - A. Grünert
- Augenklinik, Universitätsklinikum Düsseldorf, Heinrich-Heine-Universität, Düsseldorf
| | - T. Bahners
- Deutsches Textilforschungszentrum Nord-West gGmbH, Universität Duisburg-Essen, Krefeld
| | - J. Gutmann
- Deutsches Textilforschungszentrum Nord-West gGmbH, Universität Duisburg-Essen, Krefeld
| | - K. Steuhl
- Klinik für Erkrankungen des vorderen Augenabschnitts, Universitäts-Augenklinik, Essen
| | - M. Czugala
- Augenklinik, Universitätsklinikum Düsseldorf, Heinrich-Heine-Universität, Düsseldorf
| | - B. Singer
- Institut für Anatomie, Universitätsklinikum Essen, Universität Duisburg-Essen, Essen
| | - T. Fuchsluger
- Augenklinik, Universitätsklinikum Düsseldorf, Heinrich-Heine-Universität, Düsseldorf
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14
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Salehi S, Bahners T, Gutmann JS, Gao SL, Mäder E, Fuchsluger TA. Characterization of structural, mechanical and nano-mechanical properties of electrospun PGS/PCL fibers. RSC Adv 2014. [DOI: 10.1039/c4ra01237b] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Structural and mechanical properties of aligned PGS/PCL nanofibers for cornea tissue engineering are studied and compared to natural corneal stroma.
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Affiliation(s)
- S. Salehi
- Deutsches Textilforschungszentrum Nord-West gGmbH
- 47798 Krefeld, Germany
- Augenklinik
- Universitätsklinikum Düsseldorf
- Heinrich-Heine-Universität
| | - T. Bahners
- Deutsches Textilforschungszentrum Nord-West gGmbH
- 47798 Krefeld, Germany
| | - J. S. Gutmann
- Deutsches Textilforschungszentrum Nord-West gGmbH
- 47798 Krefeld, Germany
- Physikalische Chemie
- Universität Duisburg-Essen
- 45141 Essen, Germany
| | - S.-L. Gao
- Leibniz Institut für Polymerforschung e.V
- D-01069 Dresden, Germany
| | - E. Mäder
- Leibniz Institut für Polymerforschung e.V
- D-01069 Dresden, Germany
| | - T. A. Fuchsluger
- Augenklinik
- Universitätsklinikum Düsseldorf
- Heinrich-Heine-Universität
- 40225 Düsseldorf, Germany
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15
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Salehi S, Brereton HC, Arno MJ, Darling D, Quaglia A, O'Grady J, Heaton N, Aluvihare VR. Human liver regeneration is characterized by the coordinated expression of distinct microRNA governing cell cycle fate. Am J Transplant 2013; 13:1282-95. [PMID: 23465054 DOI: 10.1111/ajt.12183] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Revised: 01/10/2013] [Accepted: 01/14/2013] [Indexed: 01/25/2023]
Abstract
In the absence of adequate compensatory regeneration, overwhelming liver damage can cause acute liver failure (ALF) and death without emergent liver transplantation (LT). Auxiliary LT produces satisfactory outcomes in this setting, with the prospect of native liver regeneration sustaining long-term survival. Since animal models only partially recapitulate human liver regeneration, we investigated the molecular mechanisms controlling it in this unique LT setting, as an exemplar of human liver regeneration. We demonstrate coordinated changes in expression of microRNA (miRNA) during regeneration that drive proliferation, innate immunity and angiogenesis. In contrast, failed regeneration in a similar cohort is associated with distinct miRNA enforcing cell cycle inhibition and DNA methylation. The miRNA expression associated with successful or failed regeneration when recapitulated in vitro, triggered expression of cardinal regeneration-linked genes promoting cell cycle entry or inhibition, respectively. Furthermore, inhibition of miRNA 150, 663 and 503, whose downregulation is associated with successful regeneration, induced cell proliferation which a key determinant of successful regeneration. Our data indicate that human liver regeneration may be orchestrated by distinct miRNA controlling key regeneration-linked processes including hepatocyte proliferation. To our knowledge this is the first characterization of molecular processes associated with human liver regeneration.
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Affiliation(s)
- S Salehi
- Institute of Liver Studies, King's College Hospital, London, United Kingdom
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16
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Ferracane J, Salehi S. Dentin matrix components extracted with phosphoric acid enhance cell proliferation and mineralization. Dent Mater 2013. [DOI: 10.1016/j.dental.2013.08.150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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17
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Salehi S, Filtz TM. Berberine possesses muscarinic agonist-like properties in cultured rodent cardiomyocytes. Pharmacol Res 2010; 63:335-40. [PMID: 21168503 DOI: 10.1016/j.phrs.2010.12.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/20/2010] [Revised: 12/10/2010] [Accepted: 12/11/2010] [Indexed: 12/14/2022]
Abstract
Berberine, a natural product alkaloid, has been shown to display a wide array of pharmacological effects. Generally, the mechanism of action of each of these effects has not been well described. The aim of the present study is to test the hypothesis that some of berberine's cardiovascular effects are mediated through activation of cardiac M2 muscarinic cholinergic receptors. In our studies, we tested the ability of berberine to alter the contraction rate of cultured neonatal rodent cardiomyocytes. In these spontaneously contracting primary cultured cells, berberine reduced the contraction rate in a manner independent of β-adrenergic receptor blockade but sensitive to pertussis toxin, a Gi/o G protein inhibitor. Muscarinic antagonists completely blocked the effect of berberine on contraction rate of cardiomyocytes, whereas the effect of berberine was not opposed by antagonists to opioid, adenosine or α-adrenergic receptors. Further, berberine bound to muscarinic receptors of adult mouse heart membranes with relatively high affinity (K(i)=5.4×10(-6)M) comparable to that of the classic muscarinic agonist, carbachol, and to muscarinic M2 receptors exogenously expressed in HEK 293 cells (K(i)=4.9×10(-6)M). Therefore, the findings of the present study suggest that berberine is a muscarinic agonist at M2 receptors, potentially explaining some of its reported cardiovascular effects.
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Affiliation(s)
- Satin Salehi
- Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University, Corvallis, OR, USA
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18
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Salehi S, Long SR, Proteau PJ, Filtz TM. Hawthorn (Crataegus monogyna Jacq.) extract exhibits atropine-sensitive activity in a cultured cardiomyocyte assay. J Nat Med 2008; 63:1-8. [PMID: 18696181 DOI: 10.1007/s11418-008-0278-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2007] [Accepted: 05/26/2008] [Indexed: 11/30/2022]
Abstract
Hawthorn (Crataegus spp.) plant extract is used as a herbal alternative medicine for the prevention and treatment of various cardiovascular diseases. Recently, it was shown that hawthorn extract preparations caused negative chronotropic effects in a cultured neonatal murine cardiomyocyte assay, independent of beta-adrenergic receptor blockade. The aim of this study was to further characterize the effect of hawthorn extract to decrease the contraction rate of cultured cardiomyocytes. To test the hypothesis that hawthorn is acting via muscarinic receptors, the effect of hawthorn extract on atrial versus ventricular cardiomyocytes in culture was evaluated. As would be expected for activation of muscarinic receptors, hawthorn extract had a greater effect in atrial cells. Atrial and/or ventricular cardiomyocytes were then treated with hawthorn extract in the presence of atropine or himbacine. Changes in the contraction rate of cultured cardiomyocytes revealed that both muscarinic antagonists significantly attenuated the negative chronotropic activity of hawthorn extract. Using quinuclidinyl benzilate, L-[benzylic-4,4'-(3)H] ([(3)H]-QNB) as a radioligand antagonist, the effect of a partially purified hawthorn extract fraction to inhibit muscarinic receptor binding was quantified. Hawthorn extract fraction 3 dose-dependently inhibited [(3)H]-QNB binding to mouse heart membranes. Taken together, these findings suggest that decreased contraction frequency by hawthorn extracts in neonatal murine cardiomyocytes may be mediated via muscarinic receptor activation.
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Affiliation(s)
- Satin Salehi
- Department of Pharmaceutical Sciences, Oregon State University College of Pharmacy, 203 Pharmacy Bldg., Corvallis, OR 97331, USA
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19
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Fabre JW, Grehan A, Whitehorne M, Sawyer GJ, Dong X, Salehi S, Eckley L, Zhang X, Seddon M, Shah AM, Davenport M, Rela M. Hydrodynamic gene delivery to the pig liver via an isolated segment of the inferior vena cava. Gene Ther 2007; 15:452-62. [PMID: 18004400 DOI: 10.1038/sj.gt.3303079] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Hydrodynamic gene delivery is an attractive option for non-viral liver gene therapy, but requires evaluation of efficacy, safety and clinically applicable techniques in large animal models. We have evaluated retrograde delivery of DNA to the whole liver via the isolated segment of inferior vena cava (IVC) draining the hepatic veins. Pigs (18-20 kg weight) were given the pGL3 plasmid via two programmable syringe pumps in parallel. Volumes corresponding to 2% of body weight (360-400 ml) were delivered at 100 ml s(-1) via a Y connector. The IVC segment pressure, portal venous pressure, arterial pressure, electrocardiogram (ECG) and pulse were monitored. Concurrent studies were performed in rats for interspecies comparisons. The hydrodynamic procedure generated intrahepatic vascular pressures of 101-126 mm Hg, which is approximately 4 times higher than in rodents, but levels of gene delivery were approximately 200-fold lower. Suprahepatic IVC clamping caused a fall in arterial pressure, with the development of ECG signs of myocardial ischaemia, but these abnormalities resolved rapidly. The IVC segment approach is a clinically acceptable approach to liver gene therapy. However, it is less effective in pigs than in rodents, possibly because of larger liver size or a less compliant connective tissue framework.
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Affiliation(s)
- J W Fabre
- Department of Hepatology and Transplantation, King's College London School of Medicine, James Black Centre, London, UK.
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Jalili S, Ilkhanipou M, Heydari R, Salehi S, Farshid A. The Effects of Vitamin E on Endosulfan - Induced Oxidative Stress in Rat Heart. ACTA ACUST UNITED AC 2007. [DOI: 10.3923/pjn.2007.375.380] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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21
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Noyan Ashraf MA, Sadeghi A, Azarbakht Z, Salehi S, Hamediseresht E. Evaluation of intravenous hydrocortisone in reducing headache after spinal anesthesia: a double blind controlled clinical study [corrected]. Middle East J Anaesthesiol 2007; 19:415-22. [PMID: 17684881] [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: 05/16/2023]
Abstract
BACKGROUND Headache after spinal anesthesia is a common complication is patients undergoing this procedure. In this study we evaluated the efficacy of intravenous hydrocortisone in the treatment of headache after spinal anesthesia in women who have undergone cesarean section. METHODS Sixty patients with headache after spinal anesthesia were included. Patients randomly allocated into two groups, 30 patients received only conventional therapy (complete bed rest, hydration, acetaminophen and pethidine). Other 30 patients received conventional therapy plus intravenous hydrocortisone (200 mg first, then 100 mg TID for 48 hours). Mean (+/- SD) of headache intensity at 0, 6, 24, and 48 hours after beginning of treatment was measured using visual analog scale. RESULTS There was no significant difference in headache intensity between two groups before beginning of treatment. After 6 hours, the mean of headache intensity in 30 patients treated conventionally was 6.63 (+/- 1.35) while it was 2.77 (+/- 1.07) in other patients received intravenous hydrocortisone too (p <0.001). After 24 hours, mean headache intensity was 3.87 (+/- 1.63) in conventionally treated group versus 0.73 (+/- 0.74) in hydrocortisone group (p <0.001). After 48 hours, mean headache intensity was 1.87 (+/- 0.93) in conventionally treated group versus 0.63 (+/- 0.61) in hydrocortisone group (p = 0.001). CONCLUSIONS This study showed the therapeutic effects of intravenous hydrocortisone in reducing headache after spinal anesthesia in women who underwent cesarean section. Its mechanism of action is yet to be determined.
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Affiliation(s)
- M A Noyan Ashraf
- Imam Khomeini General Hospital, Tehran University of Medical Sciences, Tehran, Iran.
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22
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Shariati M, Parivar K, Oryan SH, Shakravi A, Alizadeh R, Salehi S. Effect of a new phenanthroline derivative on testicular tissue and serum testosterone concentration and its contraceptive affects on adult Balb/C mouse strain. Pak J Biol Sci 2007; 10:1910-3. [PMID: 19086559 DOI: 10.3923/pjbs.2007.1910.1913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In this research, the effect of 2, 6-diaminopyridinum as a new phenanthroline derivative was studied on the hypophysis-gonad axis, testicular tissue and sperm production in male Balb/C mice. Fifty adult male Balb/C mice were divided in five groups. First group was considered as untreated control. Saline was injected to second group and the remaining three groups received intraperitoneal injection of 15, 20 and 25 mg kg(-1) of 2, 6-diaminopyridinum every other day for 20 days. The LD50 was determined to be 35 mg kg(-1) body weight. The testicular tissues were studied morphologically and the serum concentration of FSH, LH and testosterone were measured. The results showed that 25 mg kg(-1) diaminopyridinum decreased the number of germ cells significantly and serum testosterone level with no change on FSH and LH levels. This study indicates that 25 mg kg(-1) of phenanthroline may directly affect testicular tissue causing a lower testosterone level and spermatogenesis in mice.
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Affiliation(s)
- M Shariati
- Islamic Azad University, Kazeroun Branch, Kazeroun, Iran
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23
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Rafsanjani KA, Vossough P, Salehi S, Bayani M. 46 Clinical features and treatment outcomes of infants with immune thrombocytopenic purpura. Thromb Res 2007. [DOI: 10.1016/s0049-3848(07)70091-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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24
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Drago F, Stanciu M, Salehi S, Scapagnini U. The block of central vasopressin V1 but not V2 receptors suppresses grooming behavior and hypothermia induced by intracerebroventricular vasopressin in male rats. Peptides 1997; 18:1389-92. [PMID: 9392841 DOI: 10.1016/s0196-9781(97)00203-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [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] [Indexed: 02/05/2023]
Abstract
The role of central vasopressin V1 receptors in grooming behavior induced by vasopressin and oxytocin was studied in male rats of the Wistar strain. The intracerebroventricular (ICV) injection of vasopressin (3 micrograms/5 microliters) induced hypothermia and enhanced novelty-induced grooming behavior. Enhanced grooming but not hypothermia was also induced by ICV injection of oxytocin (3 micrograms/5 microliters). The central administration of a selective vasopressin V1 receptor antagonist prevented the stimulating action of vasopressin on novelty-induced grooming and its hypothermic effect. The ICV injection of a selective vasopressin V2 receptor antagonist failed to affect vasopressin-induced grooming and hypothermic effect. An increase in core temperature was observed in oxytocin-injected animals pretreated with the vasopressin V1 receptor antagonist. Furthermore, pretreatment with the antagonist did not affect grooming induced by oxytocin. These results suggest that enhancement of grooming behavior and influence on thermoregulation are differently regulated by central receptors for vasopressin and oxytocin.
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Affiliation(s)
- F Drago
- Institute of Pharmacology, University of Catania Medical School, Italy.
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