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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Iranian Journal of Basic Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Colon cancer,Oncogenic and suppressor micro RNAs (miRNAs),SD-208,TGF-β receptor 1 (TGβRI) kinase inhibitor
- چکیده:
- چکیده انگلیسی:
Objective(s):Transforming growth factor-β(TGF-β) is involved in colorectal cancer (CRC). The SD-208 acts as an anti-cancer agent in different malignancies via TGF-β signaling. This work aims to show the effect of manipulation of TGF-β signaling on some miRNAs implicated in CRC.
Materials and Methods: We investigated the effects of SD-208 on SW-48, a colon adenocarcinoma cell line. The cell line was treated with 0.5, 1 and 2 μM concentrations of SD-208. Then, the xenograft model of colon cancer was established by subcutaneous inoculation of SW-48 cell line into the nude mice. The animals were treated with SD-208 for three weeks. A quantitative real-time PCR was carried out for expression level analysis of selected oncogenic (miR-21, 31, 20a and 135b) and suppressor-miRNAs (let7-g, miR-133b, 145 and 200c). Data were analyzed using the 2-∆∆CT method through student’s t-test via the GraphPad Prism software.
Results: Our results revealed that SD-208 could significantly down-regulate the expression of one key onco-miRNA, miR-135b, in either SW-48 colon cells (P=0.006) or tumors orthotopically implanted in nude mice (P=0.018). Our in silico study also predicted that SD-208 could modulate the expression of potential downstream tumor suppressor targets of the miR135b.
Conclusion: Our data provide novel evidence that anticancer effects of SD-208 (and likely other TGF-β inhibitors) may be owing to their ability to regulate miRNAs expression.- انتشار مقاله: 13-07-1394
- نویسندگان: Abolfazl Akbari,Mohammad Hossein Ghahremani,Gholam Reza Mobini,Mahdi Abastabar,Javad Akhtari,Manzar Bolhassani,Mansour Heidari
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Molecular and Clinical Microbiology
- نوع مقاله: Journal Article
- کلمات کلیدی: Candida,Antifungal Susceptibility Testing,Bronchoalveolar Lavage samples
- چکیده:
- چکیده انگلیسی: The frequency of fungal infections in immunocompromised patients, particularly by Candida species, has increased in recent years. Colonization by Candida species in respiratory tract in susceptible hosts may play an important role to precede disseminated candidiasis. This study was designed to identify Candida species from bronchoalveolar lavage (BAL) samples and determination of antifungal susceptibility of isolates to Ketoconazole, Clotrimazole, Fluconazole and Nystatin by disk diffusion method. Sampling was conducted between from 2011 to 2014 years. Three hundred and eighty four patients who were suspected to invasive fungal infections were enrolled in the study. Clinical specimens were studied for direct microscopic examination and culture. The antifungal activity test for Candida species isolated from BAL samples was performed by using disk diffusion, according to CLSI documents M44-A2. Eighty seven (%22.66) patients showed the symptoms, signs and predisposing factors for pulmonary fungal infections. The isolated species were identified as follows: C.albicans, 31 (67.39%); C.glabrata, 9 (19.56 %); C.krusei, 3 (6.5%); C.parapsilosis, 2 (4.3%); and C.tropicalis , 1 (2.25%). In this study, resistance to antifungal agents were seen to Ketoconazole, 2 (4.38%),Clotrimazole 1 (2.17%) andFluconazole, 4 (8.69%). Determination of antifungal sensitivity of the isolated yeast species should be the basis of rational and successful therapy.
- انتشار مقاله: 24-11-1392
- نویسندگان: Mojtaba Taghizadeh Armaki,Mohammad Taghi Hedayati,Saeed Mahdavi Omran,Sasan Saber,Mahdi Abastabar,Akbar Hosseinnejad
- مشاهده
- جایگاه : پژوهشی
- مجله: Current Medical Mycology
- نوع مقاله: Journal Article
- کلمات کلیدی: PCR-RFLP,Candida species,Vulvovaginal candidiasis,Antifungal Susceptibility testing,C. lusitaniae
- چکیده:
- چکیده انگلیسی: Background and Purpose: The aim of the current study was to investigate the epidemiology of vulvovaginal candidiasis (VVC) and recurrent VVC (RVVC), as well as the antifungal susceptibility patterns of Candida species isolates.
Materials and Methods: A cross-sectional study was carried out on 260 women suspected of VVC from February 2017 to January 2018. In order to identify Candida species isolated from the genital tracts, the isolates were subjected to polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP) using enzymes Msp I and sequencing. Moreover, antifungal susceptibility testing was performed according to the Clinical and Laboratory Standards Institute guidelines (M27-A3).
Results: Out of 250 subjects, 75 (28.8%) patients were affected by VVC, out of whom 15 (20%) cases had RVVC. Among the Candida species, C. albicans was the most common species (42/95; 44.21%), followed by C. lusitaniae (18/95; 18.95%), C. parapsilosis (13/95; 13.69%), C. glabrata (8/95; 8.42%), C. kefyr (6/95; 6.31%), C. famata (5/95; 5.26%), C. africana (2/95; 2.11%), and C. orthopsilosis (1/95; 1.05%), respectively. Multiple Candida species were observed in 28% (21/75) of the patients. Nystatin showed the narrowest range of minimum inhibitory concentration (MIC) (0.25-16 μg/ml) against all Candida strains, whereas fluconazole (0.063-64 μg/ml) demonstrated the widest MIC range. In the current study, C. lusitaniae, as the second most common causative agent of VVC, was susceptible to all antifungal agents. Furthermore, 61.1% of C. lusitaniae isolates were inhibited at a concentration of ≤ 2 μg/ml, while38.9% (n=7)of them exhibited fluconazole MICs above the epidemiologic cutoff values (ECV). Candida species showed the highest overall resistance against fluconazole (61.3%), followed by itraconazole (45.2%) and caspofungin (23.7%). All of C. albicans strains were resistant to itraconazole with a MIC value of ≥ 1 μg/ml; in addition, 87.5% of them were resistant to fluconazole. Moreover, 100% and 87.5% of C. glabrata strains were resistant to caspofungin and fluconazole, respectively.
Conclusion: As the findings revealed, the majority of VVC cases were caused by non-albicans Candida species which were often more resistant to antifungal agents. Candida lusitaniae generally had fluconazole MICs above the ECV. Given the propensity of C. lusitaniae to develop resistance under drug pressure, antifungals should be administered with caution. The emergence of these species justify the epidemiological surveillance surveys to watch out the distribution of yeast species.- انتشار مقاله: 24-03-1398
- نویسندگان: Seyedebrahim Hashemi,Tahereh Shokohi,Mahdi Abastabar,Narges Aslani,Mahbobeh Ghadamzadeh,Iman Haghani
- مشاهده
- جایگاه : پژوهشی
- مجله: Current Medical Mycology
- نوع مقاله: Journal Article
- کلمات کلیدی: Pneumocystis jirovecii,colonization,immunocompetent,Immunosuppressed,Mitochondrial large subunit,(mtLSU),Respiratory failures
- چکیده:
- چکیده انگلیسی: Background and Purpose: Pneumocystis jirovecii colonization plays a key role in the progression of pulmonary infection. However, there are limited data regarding the colonization of these fungi in the patients residing in different regions of Iran. Regarding this, the present study was conducted to evaluate the prevalence of P. jirovecii colonization in non-HIV-infected patients with respiratory failure introduced by physicians using nested polymerase chain reaction (PCR).
Materials and Methods: This study was conducted on 136 samples obtained from 136 patients with respiratory disorders referring to different hospitals in the capital and north of Iran during 2013-2015. The samples were collected using bronchoalveolar lavage (BAL; n=121) and sputum induction (n=15). Nested PCR method targeting mtLSU rRNA gene was used for the detection of P. jirovecii DNA in the specimens.
Results: The nested PCR analysis resulted in the detection of P. jirovecii DNA in 32 (23.5%) patients. The mean age of the participants was 49.04±11.94 years (age range: 14-90 years). The results revealed no correlation between Pneumocystis colonization and gender. The studied patients were divided into two groups of immunocompromised and immunocompetent patients. In the regard, 25.4% of the patients with detectable P. jirovecii DNA were immunocompromised and had cancer, organ transplantation, asthma, sarcoidosis, dermatomyositis, chronic obstructive pulmonary disease, bronchiectasis, and pulmonary vasculitis. On the other hand, Pneumocystis DNA was detected in 21.8% of the immunocompetent patients. Frequencies of P. jirovecii DNA detection in the patients with tuberculosis, hydatid cyst, and unknown underlying diseases were obtained as 20.8%, 25%, and 22%, respectively. The prevalence of Pneumocystis colonization varied based on age. In this regard, P. jirovecii colonization was more prevalent in patients aged above 70 years.
Conclusion: As the findings indicated, non-HIV-infected patients, especially the elderly, had a high prevalence of P. jirovecii colonization. Therefore, these patients are probably a potential source of infection for others. Regarding this, it is of paramount importance to adopt monitoring and prophylactic measures to reduce this infection.- انتشار مقاله: 15-01-1398
- نویسندگان: Mahdi Abastabar,Elham Mosayebi,Tahereh Shokohi,Mohammad Taghi Hedayati,Mohammad Reza Jabari Amiri,Zahra Seifi,Iman Haghani,Masoud Aliyali,Sasan Saber,Maryam-Fatemeh Sheikholeslami
- مشاهده
- جایگاه : پژوهشی
- مجله: Current Medical Mycology
- نوع مقاله: Journal Article
- کلمات کلیدی: Iran,dermatophytes,MALDI-TOF MS,ITS phylogeny
- چکیده:
- چکیده انگلیسی: Background and Purpose: Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) is widely used to discriminate among pathogenic microorganisms in clinical laboratories. The aim of this study was to assess the utility of MALDI-TOF MS in the routine identification of clinical dermatophyte isolates obtained from various geographical regions of Iran.
Materials and Methods: A total of 94 isolates, including Trichophyton interdigitale (n=44), T. rubrum (n=40), T. tonsurans (n=4), Microsporum canis (n=4), and Epidermophyton floccosum (n=1), were analyzed in this study. The identity of each isolate was determined by polymerase chani reaction amplification and sequencing of the internal transcribed spacer (ITS) region of nuclear-encoded ribosomal DNA and also MALDI-TOF MS. The obtained data by molecular approach were compared with MALDI-TOF MS.
Results: The MALDI-TOF MS led to the identification of 44 (47%) isolates at the species level by generating the spectral score values of ≥ 2.0. However, there was not sufficient agreement between the results of the molecular-based ITS identification methods and MALDI-TOF MS in the species identification of 16 (17%) isolates. The Bruker Daltonics database was also not able to identify protein spectra related to 12 isolates (13%), including T. interdigitale (n=5), T. rubrum (n=4), M. canis (n=2), and T. tonsurans (n=1).
Conclusion: According to the results, the utility of MALDI-TOF MS as a routine diagnostic tool for the accurate and reliable identification of dermatophytes can be justified whenever the protein spectra of a large set of worldwide clinical isolates are included in the commercial libraries. In addition, MALDI-TOF MS can be alternatively used to construct an in-house reference database.- انتشار مقاله: 18-04-1398
- نویسندگان: Mohammad Taghi. Hedayati,Saham Ansari,Bahram Ahmadi,Mojtaba Taghizadeh Armaki,Tahreh Shokohi,Mahdi Abastabar,Halil Er,Betil Özhak,Dilara Öğünç,Macit Ilkit,Seyedmojtaba Seyedmousavi
- مشاهده
- جایگاه : پژوهشی
- مجله: Current Medical Mycology
- نوع مقاله: Journal Article
- کلمات کلیدی: Amphotericin B,Antifungal resistant,Azoles,Candida endocarditis,Multi-drug resistant,Myelodysplasia syndrome,Prosthetic valve replacement
- چکیده:
- چکیده انگلیسی: Background and Purpose: Candida endocarditis is an infrequent disease with a high mortality rate, which commonly occurs in immunosuppressed patients with cardiac valve replacement. We reported a 70-year-old woman diagnosed with Candida prosthetic valve endocarditis (PVE). This study also involved a review of all published cases of Candida PVE from 1970.
Case report: Herein, we reported a 70-year-old woman with the history of severe mitral stenosis and myelodysplasia syndrome. She underwent mitral valve replacement for two times. The blood cultures were positive, and phenotypic identification of the isolates at the species level was performed based on microscopic and macroscopic characteristics. In the second prosthetic valve replacement, huge fungal white and creamy vegetation was observed which was identified as Candida albicans based on the conventional and molecular methods. Despite the administration of antifungal treatments, the patient passed away probably due to the multidrug-resistant Candida PVE.
Conclusion: As PVE is a late consequence of prosthetic valve replacement, extended follow-up visits, early diagnosis, repeating valve replacement surgeries, and timely selective antifungal treatments are warranted.
Keywords: Amphotericin B, Antifungal resistant, Azoles, Candida endocarditis, Multi-drug resistant, Myelodysplasia syndrome, Prosthetic valve replacement- انتشار مقاله: 18-04-1398
- نویسندگان: Firoozeh Kermani,Tahereh Shokohi,Mahdi Abastabar,Lotfollah Davoodi,Shervin Ziabakhsh Tabari,Rozita Jalalian,Shirin Mehdipour,Roghayeh Mirzakhani
- مشاهده
- جایگاه : پژوهشی
- مجله: Current Medical Mycology
- نوع مقاله: Journal Article
- کلمات کلیدی: cancer,Mycotoxin,HeLa cells,Patulin
- چکیده:
- چکیده انگلیسی: Background and Purpose: Patulin is a mycotoxin produced by some molds,especially Aspergillus and Penicilium, and is responsible for mycotoxicosis in animals and humans.There is still not very detailed data about the anti-cancer potency of patulin, but some reports demonstrated that it induces cellular apoptosis and toxicity.
Materials and Methods: To determine the efficacy of patulin as a therapeutic strategy for cervical and colorectal cancers, we investigated its effects on HeLa,SW-48, and MRC-5 cell lines. Cell lines were exposed to various concentrations of patulin (i.e., 0.5, 1, 2, and 4 µM), then using methyl thiazolyl tetrazolium (MTT) and bromo-2′-deoxyuridine (BrdU) assays, the rates of apoptosis and cell viability were determined.
Results: The obtained results showed a significant reduction in cell viability and apoptosis induction in a dose-dependent manner. Among all the cell lines, the highest growth inhibition rate was obtained at the 4 μM concentration of patulin.Conclusion: Our results suggested that patulin could significantly decrease tumor growth in human cervical and colorectal cancer models.
- انتشار مقاله: 18-04-1398
- نویسندگان: Mahdi Abastabar,Abolfazl Akbari,Javad Akhtari,Mohammad Taghi Hedayati,Tahereh Shokohi,Hasan Mehrad-Majd,Hosseein Ghalehnoei,Sahar Ghasemi
- مشاهده
- جایگاه : پژوهشی
- مجله: Current Medical Mycology
- نوع مقاله: Journal Article
- کلمات کلیدی: Phylogenetic analysis,identification,Candida species,HWP1 gene
- چکیده:
- چکیده انگلیسی: Background and Purpose: Hyphal wall protein 1 (HWP1) is an important adhesin which usually is expressed on the germ tube and hyphal surface produced by different Candida species. The hyphal wall protein-coding gene (HWP1) was evaluated as a novel identification and phylogenetic marker in Candida tropicalis, C. orthopsilosis, C. parapsilosis and C. glabrata.
Materials and Methods: Initially, four specific primer pairs were designed, and the target was amplified and finally sequenced. A total of 77 Candida isolates from four different species were included in the study. Consensus sequences were used for the evaluation of phylogenetic tree using the CLC Genome Workbench, GENEIOUS, and MEGA softwares and the levels of nucleotide and amino acid polymorphism were assessed.
Results: According to the results, the specific amplified fragments of HWP1 gene were useful for the differentiation of four species. Intra-species variation was observed only in C. tropicalis with two DNA types. The phylogenetic tree of Candida species based on the HWP1 gene showed consistency in topology with those inferred from other gene sequences.
Conclusion: We found that HWP1 gene was an excellent marker for the identification of non-albicans Candida species as well as the phylogenetic analysis of the most clinically significant Candida species.
- انتشار مقاله: 18-04-1398
- نویسندگان: Mahdi Abastabar,Susan Hosseinpoor
- مشاهده
- جایگاه : پژوهشی
- مجله: Current Medical Mycology
- نوع مقاله: Journal Article
- کلمات کلیدی: Antifungal susceptibility,Econazole,Superficial candidiasis
- چکیده:
- چکیده انگلیسی: Background and Purpose: Candida species are the most common organisms involved in superficial fungal infections, worldwide. Although econazole is among the most frequently used topical formulations for the treatment of candidiasis, no information is available regarding the susceptibility profiles of Candida species in Iran.
Materials and Methods: In vitro susceptibility of 100 clinical Candida isolates belonging to 6 species from superficial candidiasis of Iran towards to econazole was compared with three other common antifungal agents including itraconazole, fluconazole, and miconazole. Minimum inhibitory concentrations (MICs) values were analyzed according to the Clinical and Laboratory Standards Institute (CLSI) M38-A3 document. All isolates were previously identified to the species level, using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) on ITS region.
Results: The MIC of econazole, itraconazole, miconazole, and fluconazole were within the range of 0.016-16, 0.032-16, 0.016-16, and 0.25-64 g/ml, respectively. In general, econazole and miconazole were more active against Candida isolates, compared to the other two agents.
Conclusion: The present study demonstrated that for Candida albicans isolates, miconazole and econazole had the best effect, but in non-albicans Candida species, itraconazole and miconazole displayed more activity than other antifungal agents.- انتشار مقاله: 18-04-1398
- نویسندگان: Mahdi Abastabar,Tahereh Shokohi,Reyhaneh Rouhi Kord,Hamid Badali,Seyed Jamal Hashemi,Zeinab Ghasemi,Aynaz Ghojoghi,Nesa Baghi,Maryam Abdollahi,Susan Hosseinpoor
- مشاهده