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Mousavi S, Ono Y, VanderLaan PA, Guzmán-Arocho YD. Gastrointestinal stromal tumors in fine-needle aspiration biopsies. Diagn Cytopathol 2024. [PMID: 38396207 DOI: 10.1002/dc.25285] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 01/24/2024] [Accepted: 01/29/2024] [Indexed: 02/25/2024]
Abstract
Gastrointestinal stromal tumors (GISTs), although rare, are the most common mesenchymal neoplasms of the gastrointestinal tract. Their potential for malignancy underscores the significance of identifying them through cytomorphologic findings and pertinent immunohistochemical markers. GISTs can emerge anywhere along the gastrointestinal tract with a predilection for the stomach. The clinical manifestations vary from nonspecific abdominal symptoms to incidental discovery during diagnostic interventions for unrelated signs and symptoms. Cytologically, GIST aspirates contain spindle or epithelioid cells with immunoreactivity for CD117/c-KIT, DOG-1, and CD34. Molecularly, KIT or PDGFRA mutations are prevalent, guiding targeted therapy with tyrosine kinase inhibitors. Distinct subtypes like succinate dehydrogenase-deficient GISTs pose challenges, often affecting younger individuals and displaying unique features. Histologically, GISTs are graded by mitotic rates, aiding prognostication. Distinguishing GISTs from similar entities is pivotal, necessitating attention to their immunostaining patterns for making an accurate diagnosis and molecular alterations for effectively planning treatment. Common differential diagnoses include leiomyoma, schwannoma, and solitary fibrous tumor. This article presents a classic GIST case and showcases relatively simple diagnostic clues for identifying similar lesions that may occur in diverse locations.
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Affiliation(s)
- Seyedreza Mousavi
- Department of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA
| | - Yuho Ono
- Department of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA
| | - Paul A VanderLaan
- Department of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA
| | - Yaileen D Guzmán-Arocho
- Department of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA
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Mousavi S, Bereimipour A, Mohammadian M, Farhadihosseinabadi B, Jafari A. Differentially Expressed Genes Enrichment Analysis of Pancreatic Ductal Adenocarcinoma and Pancreatic Intraepithelial Neoplasia; an In Silico Study. Am J Clin Pathol 2022. [DOI: 10.1093/ajcp/aqac126.311] [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: 11/11/2022] Open
Abstract
Abstract
Introduction/Objective
Pancreatic ductal adenocarcinoma (PDAC) is a leading cause of cancer-related death in the United States. Determining the genetic alterations involved in the formation of PDAC and its precursor, pancreatic intraepithelial neoplasia (PanIN), may lead to earlier detection and new therapeutic options. We performed an analysis of the genetic alterations responsible for the progression of the normal pancreatic tissue to PanIN and ultimately from PanIN to PDAC.
Methods/Case Report
Initially, we used the continuous bioinformatic analysis in such a way that the RNA-seq datasets were extracted from the Biojupies database. We separately analyzed two datasets that included PDAC and PanIN, where their differentially expressed genes (DEGs) were obtained by comparison with controls. A Venn diagram was drawn to visualize the overlapping and non-overlapping DEGs in both groups. Using the Enrichr and ShinyGO databases, we examined the cell signaling pathways and ontologies of up/down-regulated genes. We mapped the protein network of important genes involved in cancer pathways by the STRING database. Finally, the shared and non-shared candidate proteins in the PDAC and PanIN pathways with the GEPIA database were confirmed in human samples.
Results (if a Case Study enter NA)
We found six shared genes in PDAC and PanIN including RAC1, RAP1A, ITGA5, RHOA, FZD2, and FN1, which appear to take part in the transition of PanIN to PDAC. Our result showed that the aforementioned genes are critical in the cell cycle, angiogenesis, and cell death processes. In the next step, the DEGs analysis in both PDAC and PanIN revealed the role of candidate genes (COX5B, NME2, MGLL, and PAICS for PanIN and PRKCA, PLCG2, NOS3, and PTK2 for PDAC) in cellular aging, MAPK, and PI3K/Akt signaling pathways.
Conclusion
Our findings showed that the overexpression of RAC1, RAP1A, ITGA5, RHOA, FZD2, and FN1 may have an important role in PanIN shifting to PDAC.
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Affiliation(s)
- S Mousavi
- Pathology, Beth Israel Deaconess Medical Center , Brookline, Massachusetts , United States
| | - A Bereimipour
- Department of Stem Cells and Developmental Biology, Cell Science Research Centre, Royan Institute , Tehran , Iran (The Islamic Republic Of)
| | - M Mohammadian
- Hematopoetic Stem Cell Research Centre, Shahid Beheshti University of Medical Sciences, Tehran, Iran (The Islamic Republic Of)
| | - B Farhadihosseinabadi
- Hematopoetic Stem Cell Research Centre, Shahid Beheshti University of Medical Sciences, Tehran, Iran (The Islamic Republic Of)
| | - A Jafari
- Proteomics Research Center, Shahid Beheshti University of Medical Sciences , Tehran , Iran (The Islamic Republic Of)
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Esmaeil Pour MA, Mohebtash M, Amin A, Khayyat A, Khalili-Toosi AR, Guo M, Mousavi S, Liu J. Literature on target therapy of malignant melanoma. J Clin Oncol 2022. [DOI: 10.1200/jco.2022.40.16_suppl.e21506] [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: 11/20/2022] Open
Abstract
e21506 Background: Malignant melanoma (MM) of mucosal membranes (excluding anus and head and neck) is a rare but aggressive disease with poor outcome. There is little information available on the mechanism of development, risk factors and management of this tumor, mainly due to the low number of cases. Methods: We performed a literature review on MMM (between 1970-2020) with a focus on nonsurgical management and outcome. Results: We identified 9-papers discussing 1500-MM cases. Formerly, for the management of MMM, Dacarbazine, Interferon b, DAV-Feron, Carboplatin, Imatinib, and Paclitaxel were administered. More recently, novel immunotherapeutic and chemotherapeutic medications such as Immune Checkpoint Inhibitors (ICPI) and anti-VEGF agents have been administered in these patients. In 502 patients of metastatic MMM, adding ipilimumab to dacarbazine increased OS from 9.1-to-11.2 months with one year survival increasing from 36.3%-to-47.3 %. For nivolumab & ipilimumab combination therapy in 361 patients with MMM and CMM, MPSF in nivolumab monotherapy was 3-months and 6.2-months (for MMM and CMM, respectively); but in nivo-ipili combination, MPFS was 5.9-months and 11.7-months (for MMM and CMM, respectively). A benefit of bevacizumab addition to platinum-based chemotherapy in patients showing advanced disease on ICPI is unknown; however, combination-therapy may be reasonable if no access to ICPI or autoimmune diseases. Conclusions: MMM patients could benefit from combination of nivolumab to ipilimumab more than monotherapy with either medication alone.[Table: see text]
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Affiliation(s)
| | | | - Ali Amin
- Pathology Department, Rhode Island Hospital, Brown University, Providence, RI
| | | | - Amir-Reza Khalili-Toosi
- Lower Mainland Pathology & Laboratory Medicine Fraser Health, Providence Health Care, Vancouver, BC, Canada
| | | | - Seyedreza Mousavi
- Beth Israel Deaconess Medical Center (Harvard Medical School Teaching Hospital), Boston, MA
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Esmaeil Pour MA, Mohebtash M, Amin A, Khayyat A, Khalili-Toosi AR, Mousavi S, Guo M, Liu J. Efficacy of the novel treatments of BCC with bone metastasis. J Clin Oncol 2022. [DOI: 10.1200/jco.2022.40.16_suppl.e14547] [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: 11/20/2022] Open
Abstract
e14547 Background: Eighty percent of nonmelanoma skin malignancies are basal cell carcinomas (BCC). Metastasis in BCC is about 0.0028 to 0.55. Diagnosis and treatment of metastatic BCC is challenging due to its rarity. In approximately 85% of metastatic BCC, the most common metastatic organs are lymph nodes. Methods: We reviewed 31 skin BCCs with bone metastasis in the past 60 years and 10 observation studies on the efficacy of Sonic hedgehog inhibitors (SHHis). We focused on treatment and outcome of 31 metastatic BCC. Results: The main treatment option was surgery and radiotherapy is a palliative option. Among chemotherapeutic and immunotherapeutic agents, SHHis (e.g. vismodegib and sonidegib) appear to be effective, with reported ORR of 43-100%, and CRR range of 3%-54%. In locally advanced BCCs, vismodegib shows 10 times higher CRRs compared to sonidegib, although ORRs were similar. In metastatic BCC, overall response to vismodegib was three times higher. The common adverse effects of SHHis limit their administration. Conclusions: BCC is a common skin neoplasm that rarely demonstrates metastasis. Among the chemotherapy agents administered, vismodegib appears promising.[Table: see text]
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Affiliation(s)
| | | | - Ali Amin
- Pathology Department, Rhode Island Hospital, Brown University, Providence, RI
| | | | - Amir-Reza Khalili-Toosi
- Lower Mainland Pathology & Laboratory Medicine Fraser Health, Providence Health Care, Vancouver, BC, Canada
| | - Seyedreza Mousavi
- Beth Israel Deaconess Medical Center (Harvard Medical School Teaching Hospital), Boston, MA
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Mousavi S, Filipová L, Ebert J, Heiligtag F, Daumke R, Loser W, Ledergerber B, Frank B, Adlhart C. Clarification of yeast cell suspensions by a highly porous polyamide nanofiber sponge. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.120273] [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: 10/19/2022]
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Contreras C, Mariotti R, Mousavi S, Baldoni L, Guerrero C, Roka L, Cultrera N, Pierantozzi P, Maestri D, Gentili L, Tivani M, Torres M. Characterization and validation of olive FAD and SAD gene families: expression analysis in different tissues and during fruit development. Mol Biol Rep 2020; 47:4345-4355. [PMID: 32468255 DOI: 10.1007/s11033-020-05554-9] [Citation(s) in RCA: 14] [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: 02/26/2020] [Accepted: 05/23/2020] [Indexed: 02/06/2023]
Abstract
Stearoyl-ACP desaturases (SADs) and fatty acid desaturases (FADs) play a critical role in plant lipid metabolism and also affect oil fatty acid composition introducing double bonds into the hydrocarbon chains to produce unsaturated fatty acids. In the present study, the genomic sequences of three SAD and three FAD candidate genes were characterized in olive and their expression was evaluated in different plant tissues. OeSAD genes corresponded to olive SAD1 and SAD2 and to a newly identified OeSAD4, sharing the conserved protein structure with other plant species. On the other hand, the full-length genomic sequences of two microsomal OeFAD genes (FAD2-1 and FAD2-2) and the plastidial FAD6, were released. When the level of expression was tested on different tissues of cv. Leccino, OeSAD1 and OeSAD2 were mainly expressed in the fruits, while OeFAD genes showed the lowest expression in this tissue. The mRNA profiling of all genes was directly studied in fruits of Leccino and Coratina cultivars during fruit development. In both genotypes, the expression level of OeSAD1 and OeSAD2 had the highest value during and after the pit-hardening period, when oil accumulation in fruit mesocarp is intensively increasing. Furthermore, the expression level of both OeFAD2 genes, which were the main candidates for oleic acid desaturation, were almost negligible during fruit ripening. These results have made possible to define candidate genes of the machinery regulation of fatty acid composition in olive oil, providing information on their sequence, gene structure and chromosomal location.
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Affiliation(s)
- C Contreras
- Estación Experimental Agropecuaria San Juan, Instituto Nacional de Tecnología Agropecuaria (INTA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), San Juan, Argentina
| | - R Mariotti
- CNR - Institute of Biosciences and Bioresources (IBBR), Perugia, Italy.
| | - S Mousavi
- CNR - Institute of Biosciences and Bioresources (IBBR), Perugia, Italy
| | - L Baldoni
- CNR - Institute of Biosciences and Bioresources (IBBR), Perugia, Italy
| | - C Guerrero
- Department of Molecular Biology and Biochemistry, Science Faculty, University of Malaga, Malaga, Spain
| | - L Roka
- Department of Biotechnology, Agricultural University of Athens, Athens, Greece
| | - N Cultrera
- CNR - Institute of Biosciences and Bioresources (IBBR), Perugia, Italy
| | - P Pierantozzi
- Estación Experimental Agropecuaria San Juan, Instituto Nacional de Tecnología Agropecuaria (INTA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), San Juan, Argentina
| | - D Maestri
- Instituto Multidisciplinario de Biología Vegetal, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - L Gentili
- Estación Experimental Agropecuaria San Juan, Instituto Nacional de Tecnología Agropecuaria (INTA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), San Juan, Argentina
| | - M Tivani
- Estación Experimental Agropecuaria San Juan, Instituto Nacional de Tecnología Agropecuaria (INTA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), San Juan, Argentina
| | - M Torres
- Estación Experimental Agropecuaria San Juan, Instituto Nacional de Tecnología Agropecuaria (INTA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), San Juan, Argentina
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Soltani R, Alikiaie B, Shafiee F, Amiri H, Mousavi S. Coenzyme Q10 improves the survival and reduces inflammatory markers in septic patients. ACTA ACUST UNITED AC 2020; 121:154-158. [PMID: 32115970 DOI: 10.4149/bll_2020_022] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE This study aimed to evaluate the effect of Coenzyme Q10 (CoQ10) administration to patients in the early phase of sepsis to determine its effect on the markers of inflammation and the clinical outcomes of septic patients. BACKGROUND Previous studies showed that CoQ10 levels were decreased in septic patients and worsening of mitochondrial dysfunction was observed. METHODS In this randomized controlled trial septic patients (n=40) received 100 mg CoQ10 twice a day for seven days added to standard treatment of sepsis. As a primary endpoint levels of Interleukin 6 (IL-6), Tumor Necrosis Factor-α (TNF-α), Glutathione peroxidase and malondialdehyde (MDA) were assessed at baseline, third and 7th day after the intervention. Secondary endpoints included assessment of clinical scores and in-hospital mortality. RESULTS There was no difference in baseline inflammatory and oxidative injury markers between the groups. TNF-α and MDA levels decreased significantly in the CoQ10 group on the 7th day of the study (P:0.003 for both). There was a significant difference in the in-hospital mortality in the CoQ10 group compared to the control group (P:0.01). CONCLUSION These findings suggest that CoQ10 has a positive effect on clinical parameters as well as mitochondrial dysfunction when administered in the early phase of sepsis (Tab. 2, Fig. 1, Ref. 38).
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Gheisari E, Pashaiefar H, Yaghmaie M, Mousavi S, Gerayeli N, Alimoghaddam K, Ghavamzadeh A. LYN and HDX gene mutations in patients with acute promyelocytic leukemia. Leuk Res 2019. [DOI: 10.1016/s0145-2126(19)30318-2] [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: 11/29/2022]
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Alagna F, Caceres ME, Pandolfi S, Collani S, Mousavi S, Mariotti R, Cultrera NGM, Baldoni L, Barcaccia G. The Paradox of Self-Fertile Varieties in the Context of Self-Incompatible Genotypes in Olive. Front Plant Sci 2019; 10:725. [PMID: 31293602 PMCID: PMC6606695 DOI: 10.3389/fpls.2019.00725] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 05/16/2019] [Indexed: 05/09/2023]
Abstract
Olive, representing one of the most important fruit crops of the Mediterranean area, is characterized by a general low fruit yield, due to numerous constraints, including alternate bearing, low flower viability, male-sterility, inter-incompatibility, and self-incompatibility (SI). Early efforts to clarify the genetic control of SI in olive gave conflicting results, and only recently, the genetic control of SI has been disclosed, revealing that olive possesses an unconventional homomorphic sporophytic diallelic system of SI, dissimilar from other described plants. This system, characterized by the presence of two SI groups, prevents self-fertilization and regulates inter-compatibility between cultivars, such that cultivars bearing the same incompatibility group are incompatible. Despite the presence of a functional SI, some varieties, in particular conditions, are able to set seeds following self-fertilization, a mechanism known as pseudo-self-compatibility (PSC), as widely reported in previous literature. Here, we summarize the results of previous works on SI in olive, particularly focusing on the occurrence of self-fertility, and offer a new perspective in view of the recent elucidation of the genetic architecture of the SI system in olive. Recent advances in research aimed at unraveling the molecular bases of SI and its breakdown in olive are also presented. The clarification of these mechanisms may have a huge impact on orchard management and will provide fundamental information for the future of olive breeding programs.
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Affiliation(s)
- F. Alagna
- Dipartimento Tecnologie Energetiche (DTE), Centro Ricerche Trisaia, ENEA Agenzia nazionale per le nuove tecnologie, l’energia e lo sviluppo economico sostenibile, Rotondella, Italy
| | - M. E. Caceres
- Dipartimento di Scienze Bio Agroalimentari (DiSBA), Istituto di Bioscienze e Biorisorse (IBBR), Consiglio Nazionale Delle Ricerche (CNR), Perugia, Italy
| | - S. Pandolfi
- Dipartimento di Scienze Bio Agroalimentari (DiSBA), Istituto di Bioscienze e Biorisorse (IBBR), Consiglio Nazionale Delle Ricerche (CNR), Perugia, Italy
| | - S. Collani
- Department of Plant Physiology, Umeå Plant Science Centre, Umeå University, Umeå, Sweden
| | - S. Mousavi
- Dipartimento di Scienze Bio Agroalimentari (DiSBA), Istituto di Bioscienze e Biorisorse (IBBR), Consiglio Nazionale Delle Ricerche (CNR), Perugia, Italy
| | - R. Mariotti
- Dipartimento di Scienze Bio Agroalimentari (DiSBA), Istituto di Bioscienze e Biorisorse (IBBR), Consiglio Nazionale Delle Ricerche (CNR), Perugia, Italy
| | - N. G. M. Cultrera
- Dipartimento di Scienze Bio Agroalimentari (DiSBA), Istituto di Bioscienze e Biorisorse (IBBR), Consiglio Nazionale Delle Ricerche (CNR), Perugia, Italy
| | - L. Baldoni
- Dipartimento di Scienze Bio Agroalimentari (DiSBA), Istituto di Bioscienze e Biorisorse (IBBR), Consiglio Nazionale Delle Ricerche (CNR), Perugia, Italy
- *Correspondence: L. Baldoni,
| | - G. Barcaccia
- Laboratorio di Genomica, Dipartimento di Agronomia, Animali, Alimenti, Risorse naturali e Ambiente (DAFNAE), Università di Padova, Legnaro, Italy
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Mousavi S, Aghayousefi A, Zadehhossein S, Honejani E, Mirjahanian N. Comparison of Episodic Memory in Students Suffering with Cerebral Palsy and Normal Students (Original paper). CSWHI 2017. [DOI: 10.22359/cswhi_8_3_04] [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: 11/23/2022]
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Baldwin JN, McKay MJ, Simic M, Hiller CE, Moloney N, Nightingale EJ, Burns J, McKay M, Chard A, Ferreira P, Fong Yan A, Hiller C, Lee (nee Zheng) F, Mackey M, Mousavi S, Nicholson L, Nightingale E, Pourkazemi F, Raymond J, Rose K, Simic M, Sman A, Wegener C, Refshauge K, Burns J, Moloney N, North K, Hübscher M, Vanicek N, Quinlan K. Self-reported knee pain and disability among healthy individuals: reference data and factors associated with the Knee injury and Osteoarthritis Outcome Score (KOOS) and KOOS-Child. Osteoarthritis Cartilage 2017; 25:1282-1290. [PMID: 28323136 DOI: 10.1016/j.joca.2017.03.007] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Revised: 03/02/2017] [Accepted: 03/08/2017] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To develop normative reference data for the Knee injury and Osteoarthritis Outcome Score (KOOS) and KOOS-Child, as well as investigate socio-demographic, psychological and physical factors associated with knee pain and disability among healthy adults. METHOD The KOOS or KOOS-Child (each containing five subscales) was administered to participants aged 8-101 years within the 1000 Norms Project, an observational study of 1000 self-reported healthy individuals. Self-efficacy, physical activity, body mass index (BMI), lower limb alignment, knee frontal plane projection angle (FPPA), knee range of motion (ROM), knee and hip strength, six-minute walk, 30-second chair stand and timed up and down stairs tests were collected. KOOS data were dichotomised using established cut-off scores and logistic regression analyses were conducted for each subscale. RESULTS Socio-demographic characteristics were similar to the Australian population. Normative reference data were generated for children (8-17 years) and adults (18-101 years). Female adults were up to twice as likely to report knee pain, symptoms and sport/recreation (Sport/Rec) limitations compared to males (P < .05). Older age, lower self-efficacy, greater BMI, varus lower limb alignment, lower knee flexion ROM and lower hip external rotation (ER) strength were independently associated with knee pain and disability among adults. CONCLUSIONS Age- and gender-stratified reference data for the KOOS and KOOS-Child have been developed to guide interpretation of results in practice and research for individuals with knee disorders. Psychological and physical factors are linked with self-reported knee pain/disability among adults, and longitudinal studies to investigate causation are required.
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Affiliation(s)
- J N Baldwin
- Arthritis and Musculoskeletal Research Group, Faculty of Health Sciences, University of Sydney, Australia.
| | - M J McKay
- Arthritis and Musculoskeletal Research Group, Faculty of Health Sciences, University of Sydney, Australia
| | - M Simic
- Arthritis and Musculoskeletal Research Group, University of Sydney, Australia
| | - C E Hiller
- Arthritis and Musculoskeletal Research Group, Faculty of Health Sciences, University of Sydney, Australia
| | - N Moloney
- Arthritis and Musculoskeletal Research Group, Faculty of Health Sciences, University of Sydney, Australia; Department of Health Sciences, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, Australia
| | - E J Nightingale
- Arthritis and Musculoskeletal Research Group, Faculty of Health Sciences, University of Sydney, Australia
| | - J Burns
- Arthritis and Musculoskeletal Research Group, Faculty of Health Sciences, University of Sydney, Australia; Paediatric Gait Analysis Service of New South Wales, Sydney Children's Hospitals Network (Randwick and Westmead), Australia
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Mousavi S, Motamedi A, Honejani E, Zadehhossein S, Mirjahanian N. Evaluation and Comparison of Episodic Memory in Elderly People: The Effect of Strategies Education on Memory Reinforcement. CSWHI 2017. [DOI: 10.22359/cswhi_8_2_11] [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: 11/23/2022]
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Mosleh-Shirazi M, Arianfard F, Karbasi S, Mousavi S. EP-1508: Quantification of skin dose and photon beam attenuation for the iBEAM couch and Compact accelerator. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)31943-6] [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: 11/26/2022]
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Bezdek S, Krajewski M, Buerger C, Schwudke D, Mousavi S, Zillikens D, Sadik C. 253 12/15-lipoxygenase aggravates psoriasiform dermatitis. J Invest Dermatol 2016. [DOI: 10.1016/j.jid.2016.06.273] [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: 11/16/2022]
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Bezdek S, Mousavi S, Hadenah A, Zillikens D, Bucala R, Sadik C. 258 Macrophage Migration Inhibitory Factor (MIF) promotes T H 17 cell-driven psoriasiform dermatitis. J Invest Dermatol 2016. [DOI: 10.1016/j.jid.2016.06.278] [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: 10/21/2022]
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Buratti C, Mousavi S, Barbanera M, Lascaro E, Cotana F, Bufacchi M. Thermal behaviour and kinetic study of the olive oil production chain residues and their mixtures during co-combustion. Bioresour Technol 2016; 214:266-275. [PMID: 27136614 DOI: 10.1016/j.biortech.2016.04.097] [Citation(s) in RCA: 2] [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] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 04/19/2016] [Accepted: 04/20/2016] [Indexed: 05/11/2023]
Abstract
The kinetic behaviour of olive tree pruning (PR), two- (2PH) and three-phase (3PH) olive pomace and their blends was investigated under combustion condition using thermogravimetric analysis. PR was blended with 2PH and 3PH at different ratios (25:75, 50:50 and 75:25) and tested in the temperature range from ambient to 1000°C in order to evaluate the co-combustion behaviour. Results showed that the thermal degradation of all samples can be divided into three regions (drying, devolatilisation, char oxidation) with different combustion properties, depending on the percentage of PR. Significant interaction was detected between the fuels, and reactivity of 2PH and 3PH was improved upon blending with PR. The iso-conversional methods, Ozawa-Flynn-Wall and Vyazovkin, were employed for the kinetic analysis of the oxidation process. The results revealed that the activation energy of PR was higher than the one of 2PH and 3PH, and the minimum value was obtained for 25PR752PH sample.
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Affiliation(s)
- C Buratti
- CRB - Biomass Research Centre, Via G. Duranti, 63, 06125 Perugia, Italy.
| | - S Mousavi
- Italian National Research Council, Institute for Agriculture and Forest Systems in the Mediterranean, CNR-ISAFOM, Via Madonna Alta, 06128 Perugia, Italy
| | - M Barbanera
- CRB - Biomass Research Centre, Via G. Duranti, 63, 06125 Perugia, Italy
| | - E Lascaro
- CRB - Biomass Research Centre, Via G. Duranti, 63, 06125 Perugia, Italy
| | - F Cotana
- CRB - Biomass Research Centre, Via G. Duranti, 63, 06125 Perugia, Italy
| | - M Bufacchi
- Italian National Research Council, Institute for Agriculture and Forest Systems in the Mediterranean, CNR-ISAFOM, Via Madonna Alta, 06128 Perugia, Italy
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18
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Hajiahmadi S, Panjehpour M, Aghaei M, Mousavi S. Molecular expression of adenosine receptors in OVCAR-3, Caov-4 and SKOV-3 human ovarian cancer cell lines. Res Pharm Sci 2015; 10:43-51. [PMID: 26430456 PMCID: PMC4578211] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Adenosine receptors (A1, A2a, A2b and A3) have several physiological and pathological roles in cancer cell lines. The present study was carried out to evaluate the mRNA and protein expression profile and functional role of adenosine receptors in OVCAR-3, Caov-4 and SKOV-3 ovarian cancer cell lines. The levels of mRNA and protein expression of A1, A2a, A2b and A3 adenosine receptors in the ovarian cancer cell lines were measured by Real-time PCR and western blotting. The functional roles of adenosine receptors were investigated through measurement of cAMP levels after agonist treatment. The mRNA and protein of all adenosine receptors subtypes were expressed in the ovarian cancer cell lines. Our findings demonstrated that A2b and A3 had the most mRNA and protein expression. Moreover, cAMP assay confirmed the functional role of A2b and A3 adenosine receptors. This findings demonstrated that A2b and A3 subtypes are most important adenosine receptors in humn ovarian cancer cell lines. This information provide a strong possibility into the relationship of A2b and A3 adenosine receptor and ovarian cancer.
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Affiliation(s)
- S. Hajiahmadi
- Department of Clinical Biochemistry and Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, I.R. Iran
| | - M. Panjehpour
- Department of Clinical Biochemistry and Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, I.R. Iran
| | - M. Aghaei
- Department of Clinical Biochemistry and Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, I.R. Iran,Corresponding author: M. Aghaei Tel: 0098 31 37922598, Fax: 0098 31 36680011
| | - S. Mousavi
- Department of Clinical Biochemistry and Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, I.R. Iran
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19
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Taziki S, Saghafi S, Mousavi S, Modanlu M, Behnampour N. EPA-0337 – Is opioid dependency related to coping strategies? Eur Psychiatry 2014. [DOI: 10.1016/s0924-9338(14)77772-7] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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20
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Kouti L, Noroozian M, Akhondzadeh S, Abdollahi M, Javadi MR, Faramarzi MA, Mousavi S, Ghaeli P. Nitric oxide and peroxynitrite serum levels in Parkinson's disease: correlation of oxidative stress and the severity of the disease. Eur Rev Med Pharmacol Sci 2013; 17:964-970. [PMID: 23640445] [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: 06/02/2023]
Abstract
BACKGROUND Nitric oxide (NO) and its toxic product peroxynitrite contribute to oxidative stress and neurodegeneration in Parkinson's disease (PD). The relationship of serum levels of these oxidants with the severity of the disease [evaluated by the Unified Parkinson's Disease Rating Scale (UPDRS)] is not established. AIM This study was designed to evaluate whether patients with PD had higher NO and peroxynitrite serum level or not. PATIENTS AND METHODS Fifty eight patients with PD and 15 healthy volunteers entered this study. The concentrations of serum NO and peroxynitrite were assayed and their correlation with the UPDRS score was assessed. RESULTS Mean serum NO levels in patient group was 29.8 ± 21.631 versus 7.49 ± 2.573 in control group, which was significantly higher in patients (p ≤ 0.0001). Peroxynitrite levels in patient and control groups were 7.37±3.501 µmol/L and 3.94 ±1.389 µmol/L respectively. Patients had a significantly higher peroxynitrite level (p = 0.0004). CONCLUSIONS Higher levels of NO and peroxynitrite leads to higher UPDRS scores. It seems since current PD treatments do not affect the pathology of the disease, using drugs that exert neuroprotective properties should be considered for the treatment of PD in order to prevent further neuronal cell loss.
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Affiliation(s)
- L Kouti
- Department of Clinical Pharmacy, Pharmaceutical Sciences Research Centre, School of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
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21
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Hendoui N, Beigmohammadi MT, Mahmoodpoor A, Ahmadi A, Abdollahi M, Hasanpour M, Hadi F, Khazaeipour Z, Mousavi S, Mojtahedzadeh M. Reliability of calcium-binding protein S100B measurement toward optimization of hyperosmolal therapy in traumatic brain injury. Eur Rev Med Pharmacol Sci 2013; 17:477-485. [PMID: 23467946] [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: 06/01/2023]
Abstract
BACKGROUND Osmotherapy is a cornerstone for the management of severe Traumatic Brain Injury (TBI). Hypertonic saline (HTS) has advantages as being preferred osmotic agent, but there is inadequte knowledge regarding dose and its saftey in comparison to mannitol. S100B, as a specific neuroinflammatory biomarker in TBI might be a reliable therapeutic index following osmotic therapy. AIM To compare both administration ways of HTS 5% (bolus and infusion) with mannitol upon S100B as a therapeutic tool for monitoring treatment in TBI patients. METHOD Adult patients wih modrate to severe TBI were recruited and have randomly received one of the three protocols: 125 cc of HTS 5% every 6 hrs (N: 11) as bolus; 500 cc of HTS 5% (N: 12) as infusion for 24 hrs; or 1 g/kg mannitol of 20% (N: 10) as a bolus, repeated with a dose of 0.25-0.5 g/kg every 6 hrs based on patient's response for 3 days. Serum S100B, blood pressure, serum sodium and osmolality and Glascow coma score (GCS) were measured at baseline and daily for 3 days. RESULTS Initial serum S100B level in TBI patients was higher than control group (p < 0.0001). Levels of measured S100B have decreased for all treatment groups, but reduction wasn't significantly after hyperosmolal therapy. GCS level increased significantly in infusion group (p = 0.002) and there were negative and significant correlation between serum S100B level and GCS level in some days. Mean arterial pressure increased significantly in HTS groups (bolus: p = 0.002, infusion < 0.0001). CONCLUSIONS S100B is closely related to the pathophysiological mechanism in TBI and may be useful as a therapeutic tool for treatment monitoring in TBI patients HTS is a safe and effective osmotic agent in TBI setting.
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Affiliation(s)
- N Hendoui
- Department of Pharmacotherapy, Faculty of Pharmacy, Mazandaran University of Medical Science and Health Services, Sari, Iran
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22
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Jamal A, Mousavi S, Alavi A. Coincidence of trisomy 18 and robertsonian (13; 14). Iran J Public Health 2012; 41:91-3. [PMID: 23113216 PMCID: PMC3469013] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2011] [Accepted: 05/18/2012] [Indexed: 11/01/2022]
Abstract
This case report presents a coincidence of trisomy 18 and balanced Robertsonian translocation (13;14). Aneuploidy was suspected based on anomalies detected in ultrasound scan and confirmed with karyotype. In a 31 years-old healthy woman with a history of one miscarriage, second trimester ultrasound scan reported IUGR (<3rd percentile) with normal amniotic fluid, bilateral choroid plexus cysts, suspicious agenesis of corpus callosum and clenched hands. Amniocentesis was performed and karyotype was 46xx,der(13;14) (q10;q10),+18. Maternal karyotype was 45xx,der(13;14)(q10;q10). Pregnancy was continued due to legal limitation for termination after 20 weeks gestation. Delivery was done at 36 weeks gestation. A female newborn was borned and a physical feature was hypotonia, small mouth, prominent occiput, low-set and posteriorly rotated ears, clenched hands with overlapping fingers and rocker bottom feet. Ultrasound scan and echocardiography detected agenesis of corpus callosum and VSD, ASD, PDA and cardiomegaly. These features are typical of trisomy 18. Balanced Robertsonian translocation usually has no phenotypic expression. Genetic counseling and prenatal diagnosis for future pregnancy was recommended.
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Affiliation(s)
| | - S Mousavi
- Corresponding Author: E-mail address:
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23
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Mousavi S, Abdollahi M, Ahmadi A, Najafi A, Pazouki M, Hadjibabaie M, Ziaee S, Hamishehkar H, Kebriaeezadeh A, Mojtahedzadeh M. The dilemma of hyperoxia following positive pressure mechanical ventilation: role of iron and the benefit of iron chelation with deferasirox. Eur Rev Med Pharmacol Sci 2011; 15:1141-1148. [PMID: 22165674] [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: 05/31/2023]
Abstract
BACKGROUND AND OBJECTIVE Increased oxidative stress in patients under treatment with high concentrations of oxygen (hyperoxia) is considered to be one of the major mechanisms of lung injury, which is thought among different mediators, transition metal ion, iron, by generation of very reactive free radicals which play an important role. Disruption of normal iron homeostasis has been reported in hyperoxic conditions. We hypothesized that chelation of iron can reduce hyperoxia-induced lung injury. METHODS Mechanically ventilated patients, who received oxygen with FiO2 >0.5 for at least 3 days, underwent bronchoscopy before and 72 hours after receiving "Deferasirox". Oxidative injury index and iron homeostasis markers were measured in lavage fluid and plasma. RESULTS In 12 patients, the concentrations of 8-isoprostane (p=0.005), 8-oxoguanine (p=0.04), carbonyl proteins (p=0.04)--as markers of oxidative stress--decreased significantly in lavage fluid after intervention. Levels of iron-related proteins, ferritin (p=0.04) and transferrin (p=0.005) also decreased significantly in lavage fluid. CONCLUSION Deferasirox--as an iron chelator--decrease oxidative injury index in hyperoxic condition and it could be consider safe and beneficial agent, along with other supportive measures in hyperoxia-induced lung injury for better toleration of oxygen therapy.
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Affiliation(s)
- S Mousavi
- Department of Clinical Pharmacy, School of Pharmacy, Tehran University of Medical Sciences and Health Services, Tehran, Iran
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24
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Mousavi S, Levcovich B, Mojtahedzadeh M. A systematic review on pharmacokinetic changes in critically ill patients: role of extracorporeal membrane oxygenation. Daru 2011; 19:312-21. [PMID: 22615675 PMCID: PMC3304397] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2011] [Revised: 10/26/2011] [Accepted: 10/28/2011] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVE Several factors including disease condition and different procedures could alter pharmacokinetic profile of drugs in critically ill patients. For optimizing patient's outcome, changing in dosing regimen is necessary. Extracorporeal Membrane Oxygenation (ECMO) is one of the procedures which could change pharmacokinetic parameters.The aim of this review was to evaluate the effect of ECMO support on pharmacokinetic parameters and subsequently pharmacotherapy. METHOD A systematic review was conducted by reviewing all papers found by searching following key words; extracorporeal membrane oxygenation, ECMO, pharmacokinetic and pharmacotherapy in bibliography database. RESULTS Different drug classes have been studied; mostly antibiotics. Almost all of the studies have been performed in neonates (as a case series). ECMO support is associated with altered pharmacokinetic parameters that may result in acute changes in plasma concentrations with potentially unpredictable pharmacological effect. Altreation in volume of distribution, protein binding, renal or hepatic clearance and sequestration of drugs by ECMO circuit may result in higher or lower doses requirement during ECMO. As yet, definite dosing guideline is not available. ECMO is extensively used recently for therapy and as a procedure affects pharmacokinetics profile along with other factors in critically ill patients. For optimizing the pharmacodynamic response and outcome of patients, drug regimen should be individualized through therapeutic drug monitoring whenever possible.
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Affiliation(s)
- S. Mousavi
- Department of Clinical Pharmacy, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - B Levcovich
- Pharmacy Department, The Alfred Hospital, Faculty of Pharmacy and Pharmaceutical Sciences, Monash University,Melbourne, Australia
| | - M. Mojtahedzadeh
- Department of Clinical Pharmacy, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran,Correspondence:
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25
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Hajhashemi V, Ghannadi A, Mousavi S. Antinociceptive study of extracts of Platanus orientalis leaves in mice. Res Pharm Sci 2011; 6:123-8. [PMID: 22224096 PMCID: PMC3249775] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Platanus orientalis L. (Platanaceae) is a medicinal tree used in Iranian folklore and traditional medicine as a pain and inflammation reliever. In this study, the polyphenolic and total extract of P. orientalis leaves were prepared and their antinociceptive effects were studied in mice using the acetic acid-induced writhing, formalin and light tail flick tests. Both hydroalcoholic and polyphenolic extracts of P. orientalis at a dose of 2 g/kg significantly (P<0.05) reduced acetic acid-induced abdominal writhes. These extracts were also effective in suppression of formalin-induced pain behavior but they did not show any significant analgesia in light tail flick test. It is concluded that P. orientalis extracts have moderate analgesic effect and further studies are needed to elucidate the mechanism and active constituents.
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Affiliation(s)
- V. Hajhashemi
- Department of Pharmacology and Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, I.R.Iran.,
Corresponding author: V. Hajhashemi, this paper is extracted from the Pharm.D thesis No. 83126 Tel. 0098 311 7922630, Fax. 0098 311 6680011
| | - A. Ghannadi
- Department of Pharmacognosy and Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, I.R.Iran
| | - S. Mousavi
- Department of Pharmacology and Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, I.R.Iran
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26
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Ghavamzadeh A, Alimoghaddam K, Ghaffari S, Rostami S, Jahani M, Iravani M, Mousavi S, Jalili M, Alizadeh N, Khodabandeh A. Results of new cases of APL treatment by arsenic trioxide and long-term follow-up: Is it time for using arsenic trioxide in first-line treatment? J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.6545] [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: 11/20/2022] Open
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27
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Ansari NN, Adelmanesh F, Naghdi S, Mousavi S. The relationship between symptoms, clinical tests and nerve conduction study findings in carpal tunnel syndrome. Electromyogr Clin Neurophysiol 2009; 49:53-7. [PMID: 19280800 DOI: pmid/19280800] [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: 02/08/2023]
Abstract
Carpal tunnel syndrome (CTS) is the most common entrapment neuropathy. The aim of the present study was to determine the relationship between patients reported symptoms and clinical tests with electrodiagnostic findings. Three hundred and nine patients with a mean age of 48.35 +/- 12.26 (range = 19-81 years) participated. Patients were assessed clinically and electrophysiologically. The main outcome measures were CTS related symptoms of pain and paraesthesia, Tinel sign, Phalen's test, distal sensory latency, and distal motor latency. The symptoms of presence of pain and diurnal paraesthesia showed a statistical relationship with the distal sensory latency. No relationship was found between the Tinel sign and either the distal sensory latency or the distal motor latency. Furtheremore, no relationship could be shown between Phalen 60 s, Phalen 45 s and distal sensory and motor latency. The Phalen 30 s had a significant relationship with both sensory and motor distal latency. The findings of this study indicate that both CTS related symptoms of pain, diurnal paraesthesia, and Phalen 30 s are associated with electrodiagnostic tests.
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Affiliation(s)
- N Nakhostin Ansari
- Faculty of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran.
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28
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Welch K, Mousavi S, Lundberg B, Strømme M. Viscoelastic characterization of compacted pharmaceutical excipient materials by analysis of frequency-dependent mechanical relaxation processes. Eur Phys J E Soft Matter 2005; 18:105-12. [PMID: 16184321 DOI: 10.1140/epje/i2005-10032-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2005] [Accepted: 07/25/2005] [Indexed: 05/04/2023]
Abstract
A newly developed method for determining the frequency-dependent complex Young's modulus was employed to analyze the mechanical response of compacted microcrystalline cellulose, sorbitol, ethyl cellulose and starch for frequencies up to 20 kHz. A Debye-like relaxation was observed in all the studied pharmaceutical excipient materials and a comparison with corresponding dielectric spectroscopy data was made. The location in frequency of the relaxation peak was shown to correlate to the measured tensile strength of the tablets, and the relaxation was interpreted as the vibrational response of the interparticle hydrogen and van der Waals bindings in the tablets. Further, the measured relaxation strength, holding information about the energy loss involved in the relaxation processes, showed that the weakest material in terms of tensile strength, starch, is the material among the four tested ones that is able to absorb the most energy within its structure when exposed to external perturbations inducing vibrations in the studied frequency range. The results indicate that mechanical relaxation analysis performed over relatively broad frequency ranges should be useful for predicting material properties of importance for the functionality of a material in applications such as, e.g., drug delivery, drug storage and handling, and also for clarifying the origin of hitherto unexplained molecular processes.
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Affiliation(s)
- K Welch
- Department of Engineering Sciences, The Angström Laboratory, Uppsala University, Box 534, SE-75 121, Uppsala, Sweden
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