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Fagheei Aghmiyuni Z, Saderi H, Owlia P, Saidi N. Evaluation of the Effect of Lactobacillus acidophilus ATCC 4356 Bacteriocin against Staphylococcus aureus. Biomed Res Int 2024; 2024:4119960. [PMID: 38559901 PMCID: PMC10980545 DOI: 10.1155/2024/4119960] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 02/05/2024] [Accepted: 02/27/2024] [Indexed: 04/04/2024]
Abstract
Background Lactobacillus acidophilus is lactic acid bacteria that produce bacteriocins. Bacteriocins are antimicrobial peptides or proteins that exhibit activity against closely related bacteria. The aim of this study was to determine the effect of L. acidophilus ATCC 4356 bacteriocin against Staphylococcus aureus. Material and Methods. We used four different phenotypic methods for antimicrobial activities against two standard strains: methicillin-resistant S. aureus (MRSA) ATCC 33591 and methicillin-susceptible S. aureus (MSSA) ATCC 25923. The methods were (1) agar well diffusion, (2) overlay soft agar, (3) paper disk, and (4) modification of punch hole. The ammonium sulfate method was used to concentrate crude bacteriocin, and ultrafiltration and dialysis tubes were used to remove ammonium sulfate from the bacteriocins. Each method was repeated in triplicate. Result L. acidophilus ATCC 4356 showed antimicrobial activity against both MRSA and MSSA standard strains only by the overlay soft agar method and not by the agar well diffusion, punch hole modification, and paper disk methods. No antimicrobial effects were observed in crude bacteriocins concentrated. Conclusion The growth inhibition of S. aureus in overlay soft agar method may be due to the production of bacteriocin-like substances. The overlay soft agar method is a qualitative test, so there is a need for further study to optimize the conditions for the production of bacteriocin-like substances in the culture supernatant and precise comparison between the inhibitory activity and pheromone secretion of different strains.
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Affiliation(s)
| | - Horieh Saderi
- Molecular Microbiology Research Center, Shahed University, Tehran, Iran
| | - Parviz Owlia
- Molecular Microbiology Research Center, Shahed University, Tehran, Iran
| | - Navid Saidi
- Molecular Microbiology Research Center, Shahed University, Tehran, Iran
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Eriani K, Desriani D, Putri VC, Nursanty R, Mariya S, Umaratusalihah S, Ichsan I, Saidi N. The effect of Cissus quadrangularis Salisb. extract on maturation of rat mesenchymal stem cells. BRAZ J BIOL 2023; 83:e270335. [PMID: 37255198 DOI: 10.1590/1519-6984.270335] [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: 12/12/2022] [Accepted: 04/17/2023] [Indexed: 06/01/2023] Open
Abstract
Degenerative diseases, such as osteoporosis, could be treated by stem cells. The aim of this study was to identify the gene expression of bone marrow mesenchymal stem cells (BM-MSC) derived from Sprague Dawley rats and to assess the effect of Cissus quadrangularis Salisb. extract on their maturation into bone cells. The BM-MSC were divided into three groups: (a) BM-MSCs + osteoblast cell growth basal medium as the positive control; (b) BM-MSCs + Dulbecco's modified eagle's medium (DMEM) + 0.3 mg/mL methanol extract of C. quadrangularis as methanol group; and (c) BM-MSC + DMEM + 0.3 mg/mL ethyl acetate extract of C. quadrangularis as ethyl acetate group. A relative quantification approach using was used to analyze the expression of the alp (alkaline phosphatase) gene, with the beta-actin gene was used to normalize the expression of the alp gene. The intra-assay variation was calculated to validate the RT-qPCR data. Our study found that the intra-assay variation value was acceptable, with most of the coefficients of variability (CV) value <5. Ethyl acetate solvent outperformed methanol solvent in extracting the active compound C. quadrangularis. In the ethyl acetate extract group, the expression of the alp gene increased three times compared to the positive control. In methanol extract group, the expression of alp gene was lower six times compared to positive control. This study suggests that C. quadrangularis extracts using ethyl acetate could induce the maturation of BM-MSCs. However, further studies are warrant to confirm this effect using different indicators.
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Affiliation(s)
- K Eriani
- Universitas Syiah Kuala, Faculty of Mathematics and Natural Sciences, Department of Biology, Banda Aceh, Indonesia
| | - D Desriani
- Research Center for Genetic Engineering National Research and Innovation Agency, Cibinong, Indonesia
| | - Vianti C Putri
- Universitas Syiah Kuala, Faculty of Mathematics and Natural Sciences, Department of Biology, Banda Aceh, Indonesia
| | - R Nursanty
- Universitas Syiah Kuala, Faculty of Mathematics and Natural Sciences, Department of Biology, Banda Aceh, Indonesia
| | - S Mariya
- IPB University, Primate Research Center, Bogor, Indonesia
| | - S Umaratusalihah
- Universitas Syiah Kuala, Faculty of Mathematics and Natural Sciences, Department of Biology, Banda Aceh, Indonesia
| | - I Ichsan
- Universitas Syiah Kuala, Faculty of Medicine, Banda Aceh, Aceh, Indonesia
| | - N Saidi
- Universitas Syiah Kuala, Department of Chemistry, Banda Aceh, Aceh, Indonesia
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Saidi N, Davarzani F, Yousefpour Z, Owlia P. Effects of Sub-Minimum Inhibitory Concentrations of Gentamicin on Alginate Produced by Clinical Isolates of Pseudomonas aeruginosa. Adv Biomed Res 2023; 12:94. [PMID: 37288011 PMCID: PMC10241631 DOI: 10.4103/abr.abr_389_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 09/09/2022] [Accepted: 10/22/2022] [Indexed: 06/09/2023] Open
Abstract
Background Bacterial virulence factors may be influenced by sub-minimum inhibitory concentrations (sub-MICs) of antibiotics. The main purpose of this study was to investigate the effects of gentamicin at sub-MICs (0.5 MIC and 0.25 MIC) on alginate production of clinical isolates of Pseudomonas aeruginosa. Materials and Methods The minimum inhibitory concentrations of gentamicin against 88 clinical isolates of P. aeruginosa were determined using the broth microdilution method. Alginate production of the isolates in the absence and presence of gentamicin at sub-MICs was assessed by the carbazole method. The presence of alginate in clinical isolates was confirmed by the detection of alginate genes (algD and algU) using the PCR method. Results All the isolates had the ability of alginate production and were positive for algD and algU genes. sub-MICs of gentamicin significantly increased alginate production of 34 isolates (38.6%). On the other hand, in 49 isolates (55.7%), alginate production was significantly increased after treatment with sub-MICs of gentamicin. In five isolates (5.7%), the alginate production was reduced in exposure to 0.5 MIC of gentamicin while it was increased by gentamicin at 0.25 MIC. Conclusion This study showed different effects of gentamicin at sub-MICs on the alginate production of clinical isolates of P. aeruginosa. Further research is highly recommended to understand the mechanism of different responses of P. aeruginosa isolates to the exposure of sub-MICs of gentamicin.
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Affiliation(s)
- Navid Saidi
- Molecular Microbiology Research Center (MMRC), Faculty of Medicine, Shahed University, Tehran, Iran
| | - Fateme Davarzani
- Molecular Microbiology Research Center (MMRC), Faculty of Medicine, Shahed University, Tehran, Iran
| | - Zahra Yousefpour
- Molecular Microbiology Research Center (MMRC), Faculty of Medicine, Shahed University, Tehran, Iran
| | - Parviz Owlia
- Molecular Microbiology Research Center (MMRC), Faculty of Medicine, Shahed University, Tehran, Iran
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Saidi N, Saderi H, Owlia P, Soleimani M. Anti-Biofilm Potential of Lactobacillus casei and Lactobacillus rhamnosus Cell-Free Supernatant Extracts against Staphylococcus aureus. Adv Biomed Res 2023; 12:50. [PMID: 37057221 PMCID: PMC10086653 DOI: 10.4103/abr.abr_156_21] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 01/25/2022] [Accepted: 01/31/2022] [Indexed: 04/15/2023] Open
Abstract
Background Biofilm production is an important virulence factor in Staphylococcus aureus. Most of the infections associated with biofilms of this bacterium are very difficult to treat using antibiotics. The present research studied the effects of the two probiotic Lactobacillus species L. casei and L. rhamnosus on S. aureus biofilm. Materials and Methods Cell-free supernatant (CFS) extracts of L. casei ATCC 39392 and L. rhamnosus ATCC 7469 culture were prepared. The effects of sub-minimum inhibitory concentrations of the CFS extracts on cell surface hydrophobicity (CSH), initial attachment, biofilm formation, and their ability in eradicating S. aureus ATCC 33591 biofilms were assessed. In addition, the effects of CFS extracts on expression of the genes involved in formation of S. aureus biofilms (cidA, hld, sarA, icaA, and icaR) were also evaluated through real-time polymerase chain reaction. Results CFSs of both Lactobacillus spp. significantly reduced CSH, initial attachment, and biofilm formation and eradicated the biofilms. The above findings were supported by scanning electron microscopy results. These two Lactobacillus CFSs significantly changed the expression of all studied biofilm-related genes. Expression levels of cidA, hld, and icaR genes significantly increased by 4.4, 2.3, and 4.76 fold, respectively, but sarA and icaA genes were significantly downregulated by 3.12 and 2.3 fold. Conclusion The results indicated that CFS extracts of L. casei and L. rhamnosus had desirable antagonistic and anti-biofilm effects against S. aureus. Consequently, carrying out further research enables us to prepare pharmaceuticals from these CFSs in order to prevent and treat infections caused by S. aureus biofilms.
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Affiliation(s)
- Navid Saidi
- Department of Microbiology, Faculty of Medicine, AJA University of Medical Sciences, Tehran, Iran
| | - Horieh Saderi
- Molecular Microbiology Research Center, Faculty of Medicine, Shahed University, Tehran, Iran
| | - Parviz Owlia
- Department of Microbiology, Faculty of Medicine, AJA University of Medical Sciences, Tehran, Iran
| | - Mohammad Soleimani
- Department of Microbiology, Faculty of Medicine, AJA University of Medical Sciences, Tehran, Iran
- Infectious Diseases Research Center, AJA University of Medical Sciences, Tehran, Iran
- Address for correspondence: Dr. Mohammad Soleimani, Department of Microbiology, Faculty of Medicine, AJA University of Medical Sciences, Shahid Etemadzadeh Street, Tehran, Iran. E-mail:
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Saidi N, Azzaoui K, Ramdani M, Mejdoubi E, Jaradat N, Jodeh S, Hammouti B, Sabbahi R, Lamhamdi A. Design of Nanohydroxyapatite/Pectin Composite from Opuntia Ficus-Indica Cladodes for the Management of Microbial Infections. Polymers (Basel) 2022; 14:polym14204446. [PMID: 36298024 PMCID: PMC9612341 DOI: 10.3390/polym14204446] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Revised: 10/14/2022] [Accepted: 10/17/2022] [Indexed: 11/16/2022] Open
Abstract
Hydroxyapatite (HAp) attracts interest as a biomaterial for use in bone substitution or allografts. In the current work, biomaterial nanocomposites based on HAp and pectin were synthesized by using the double decomposition method, which involved using pectin extracted from fresh cladodes of the prickly pear, Opuntia ficus-indica. The crystallinity, purity, and several analytical techniques like Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy were used to understand the surface’s shape. The results revealed that the produced HAp/pectin nanoparticles are pure, spherical, and amorphous. The spectroscopic data indicated a substantial interaction between HAp and pectin, specifically between Ca (II) and pectin hydroxyl and carboxyl groups. The presence of pectin showed a noticeable influence on the prepared nanocomposite texture and porosity. We further assess the antibacterial and antifungal activity of the developed nanocomposite against a number of pathogenic bacteria and fungi, evaluated by the well diffusion method. In the absence of pectin, the XRD analysis revealed that the HAp nanoparticles had 10.93% crystallinity. When the pectin concentration reached 10 wt.%, it was reduced to approximately 7.29%. All synthesized nanocomposites demonstrated strong antimicrobial activity against both Gram-positive (Staphylococcus aureus and Bacillus cereus) and Gram-negative (Escherichia coli and Pseudomonas aeruginosa) bacteria in addition to various fungi (e.g., Aspergillus fumigatus, Penicillium funiculosum, and Trichoderma viride). This study endorses the HAp/Pectin nanocomposite as an efficient antimicrobial material for biomedical advanced applications.
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Affiliation(s)
- N. Saidi
- Laboratory of Applied Chemistry and Environment (LCAE), Department of Chemistry, Faculty of Sciences, University Mohamed I, Oujda P.O. Box 717, Morocco
| | - K. Azzaoui
- Laboratory of Applied Chemistry and Environment (LCAE), Department of Chemistry, Faculty of Sciences, University Mohamed I, Oujda P.O. Box 717, Morocco
| | - M. Ramdani
- Laboratory of Applied Chemistry and Environment (LCAE), Department of Chemistry, Faculty of Sciences, University Mohamed I, Oujda P.O. Box 717, Morocco
| | - E. Mejdoubi
- Laboratory of Applied Chemistry and Environment (LCAE), Department of Chemistry, Faculty of Sciences, University Mohamed I, Oujda P.O. Box 717, Morocco
| | - N. Jaradat
- Department of Pharmacy, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus P.O. Box 7, Palestine
- Correspondence: (N.J.); (S.J.)
| | - S. Jodeh
- Department of Chemistry, An-Najah National University, Nablus P.O. Box 7, Palestine
- Correspondence: (N.J.); (S.J.)
| | - B. Hammouti
- Laboratory of Applied Chemistry and Environment (LCAE), Department of Chemistry, Faculty of Sciences, University Mohamed I, Oujda P.O. Box 717, Morocco
| | - R. Sabbahi
- Laboratory of Plant Biotechnology, Higher School of Technology, University of Ibn Zohr Quartier 25 Mars, Laayoune P.O. Box 3007, Morocco
| | - A. Lamhamdi
- Laboratory of Applied Sciences, National School of Applied Sciences (ENSAH), Abdelmalek Essaadi University, Tetouan P.O. Box 2222, Morocco
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Davarzani F, Yousefpour Z, Saidi N, Owlia P. Different effects of sub-minimum inhibitory concentrations of gentamicin on the expression of genes involved in alginate production and biofilm formation of Pseudomonas aeruginosa. IJM 2021; 13:808-816. [PMID: 35222859 PMCID: PMC8816707 DOI: 10.18502/ijm.v13i6.8085] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Background and Objectives: Antibiotics at sub-minimum inhibitory concentrations (sub-MIC) may alter bacterial virulence factors. The objective of this study was to investigate the effect of gentamicin at sub-MIC concentrations on the expression of genes involved in alginate production and biofilm formation of Pseudomonas aeruginosa. Materials and Methods: The broth microdilution method was used to determine the MIC of gentamicin for three P. aeruginosa clinical isolates (P1-P3) and standard strains (PAO1 and 8821M). Alginate production and biofilm formation of the bacteria in the presence and absence of sub-MIC concentrations of gentamicin were measured using microtiter plate and carbazole assay, respectively. The real-time PCR method was used to determine the effect of gentamicin at sub-MIC concentrations on the expression level of genes involved in biofilm formation (pelA and pslA) and alginate production (algD and algU). Results: Gentamicin at sub-MIC concentrations significantly reduced alginate production, biofilm formation, and the expression of alginate and biofilm-encoding genes in clinical isolate P1. This inhibitory effect was also observed on the alginate production of 8821M strain and biofilm formation of PAO1strain. In clinical isolates, P2 and P3, alginate production, biofilm formation, and the expression of alginate and biofilm-encoding genes were significantly increased in exposure to sub-MIC concentrations of gentamicin. Conclusion: This study showed that different phenotypic changes in clinical isolates and standard strains of P. aeruginosa in exposure to sub-MIC concentrations of gentamicin are associated with changes in the expression of virulence genes. Further researches are required to understand the mechanisms involved in regulating the expression of virulence genes after exposure to sub-MIC concentrations of antibiotics.
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Affiliation(s)
| | | | | | - Parviz Owlia
- Corresponding author: Parviz Owlia, Ph.D, Molecular Microbiology Research Center (MMRC), School of Medicine, Shahed University, Tehran, Iran. Tel: +98-21-66952202 Fax: +98-21-66952202
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Abstract
BACKGROUND Dengue fever is a mosquito-borne viral illness with 100 million new cases occurring worldwide. The vectors involved are mainly Aedes aegypti and Aedes albopictus. Dengue infection is associated with maternal as well as fetal morbidities, like stillbirth, preterm birth, and low birth weight. THE CASE We report a case of dengue fever occurring during early pregnancy and subsequent congenital neurologic malformation in the neonate as a result of vertical transmission. To our knowledge, this is the first case of confirmed congenital dengue in Saudi Arabia. DISCUSSION Dengue infection is not commonly associated with congenital anomalies and no biologic mechanism has yet been established for its teratogenicity. Congenital dengue in neonates can be confirmed by identification of the dengue virus in cord blood samples. The positive dengue serology within the first week of life, together with the confirmed maternal dengue infection during pregnancy, supports the diagnosis of vertical transmission in the presence of clinical manifestations. A high index of suspicion, early diagnosis, and close monitoring is needed in these cases.
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Affiliation(s)
- J Alallah
- Department of Pediatrics, Neonatology Division, Ministry of National Guard - Health Affairs, Jeddah, Saudi Arabia.,King Abdullah International Medical Research Center, Jeddah, Saudi Arabia.,King Saud Bin AbdulAziz University for Health Sciences, Jeddah, Saudi Arabia
| | - F Mohtisham
- Department of Pediatrics, Neonatology Division, Ministry of National Guard - Health Affairs, Jeddah, Saudi Arabia.,King Abdullah International Medical Research Center, Jeddah, Saudi Arabia
| | - N Saidi
- King Abdullah International Medical Research Center, Jeddah, Saudi Arabia.,Department of Obstetrics and Gynecology, Ministry of National Guard - Health Affairs, Jeddah, Saudi Arabia
| | - A Almehdar
- King Abdullah International Medical Research Center, Jeddah, Saudi Arabia.,King Saud Bin AbdulAziz University for Health Sciences, Jeddah, Saudi Arabia.,Department of Radiology, Ministry of National Guard - Health Affairs, Jeddah, Saudi Arabia
| | - A Anees
- Department of Pediatrics, Neonatology Division, Ministry of National Guard - Health Affairs, Jeddah, Saudi Arabia.,King Abdullah International Medical Research Center, Jeddah, Saudi Arabia.,King Saud Bin AbdulAziz University for Health Sciences, Jeddah, Saudi Arabia
| | - A Sallout
- King Abdullah International Medical Research Center, Jeddah, Saudi Arabia.,King Saud Bin AbdulAziz University for Health Sciences, Jeddah, Saudi Arabia.,Department of Obstetrics and Gynecology, Ministry of National Guard - Health Affairs, Jeddah, Saudi Arabia
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Davarzani F, Saidi N, Besharati S, Saderi H, Rasooli I, Owlia P. Evaluation of Antibiotic Resistance Pattern, Alginate and Biofilm Production in Clinical Isolates of Pseudomonas aeruginosa. Iran J Public Health 2021; 50:341-349. [PMID: 33747998 PMCID: PMC7956088 DOI: 10.18502/ijph.v50i2.5349] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Background Pseudomonas aeruginosa is one of the most common opportunistic bacteria causing nosocomial infections, which has significant resistance to antimicrobial agents. This bacterium is a biofilm and alginate producer. Biofilm increases the bacterial resistance to antibiotics and the immune system. Therefore, the present study was conducted to investigate the biofilm formation, alginate production and antimicrobial resistance patterns in the clinical isolates of P. aeruginosa. Methods One hundred isolates of P. aeruginosa were collected during the study period (from Dec 2017 to Jul 2018) from different clinical samples of the patients admitted to Milad and Pars Hospitals at Tehran, Iran. Isolates were identified and confirmed by phenotypic and genotypic methods. Antimicrobial susceptibility was specified by the disk diffusion method. Biofilm formation and alginate production were measured by microtiter plate and carbazole assay, respectively. Results Sixteen isolates were resistant to all the 12 studied antibiotics. Moreover, 31 isolates were Multidrug-Resistant (MDR). The highest resistance rate was related to ofloxacin (36 isolates) and the least resistance was related to piperacillin-tazobactam (21 isolates). All the isolates could produce the biofilm and alginate. The number of isolates producing strong, medium and weak biofilms was equal to 34, 52, and 14, respectively. Alginate production was more than 400 μg/ml in 39 isolates, 250-400 μg/ml in 51 isolates and less than 250 μg/ml in 10 isolates. Conclusion High prevalence of MDR, biofilm formation, and alginate production were observed among the clinical isolates of P. aeruginosa. The results also showed a significant relationship between the amount of alginate production and the level of biofilm formation.
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Affiliation(s)
- Fateme Davarzani
- Department of Microbiology, Faculty of Medicine, Shahed University, Tehran, Iran
| | - Navid Saidi
- Molecular Microbiology Research Center (MMRC), Faculty of Medicine, Shahed University, Tehran, Iran
| | - Saeed Besharati
- Molecular Microbiology Research Center (MMRC), Faculty of Medicine, Shahed University, Tehran, Iran
| | - Horieh Saderi
- Molecular Microbiology Research Center (MMRC), Faculty of Medicine, Shahed University, Tehran, Iran
| | - Iraj Rasooli
- Department of Biology, Faculty of Science, Shahed University, Tehran, Iran
| | - Parviz Owlia
- Molecular Microbiology Research Center (MMRC), Faculty of Medicine, Shahed University, Tehran, Iran
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A. Akbar S, Mardhiah A, Saidi N, Lelifajri D. The effect of graphite composition on polyaniline film performance for formalin gas sensor. B CHEM SOC ETHIOPIA 2021. [DOI: 10.4314/bcse.v34i3.14] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The invention of formalin gas sensors based on polyaniline (PANI) has been developed which arranged by PANI|graphite composite form. The reaction between amine and formaldehyde produced a Schiff base that alters the resistance of PANI film as a function of formaldehyde concentration. The response of the sensor was measured in variations of graphite composition with 3%, 10%, and 25%. The results showed similar patterns in all concentrations of formalin. However, the sensor response at 10% and 25% graphite decreased dramatically. The formalin with concentration 400 ppm shown the response with 3% graphite was 1.62 times greater than 25%. Addition of too much graphite makes the absorption area on the PANI surface becomes less because the graphite covered it. In this case, the sensor performance was still stable and functional, but the measured resistance seems smaller because the sensor conductivity level more dominated by graphite. Therefore, composites of polyaniline and graphite can be used as sensors to detect the presence of formaldehyde gas.
KEY WORDS: Formalin, Graphite, Polyaniline, Resistance, Sensors
Bull. Chem. Soc. Ethiop. 2020, 34(3), 597-604.
DOI: https://dx.doi.org/10.4314/bcse.v34i3.14
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Saidi N, Owlia P, Marashi SMA, Saderi H. Inhibitory effect of probiotic yeast Saccharomyces cerevisiae on biofilm formation and expression of α-hemolysin and enterotoxin A genes of Staphylococcus aureus. IJM 2019. [DOI: 10.18502/ijm.v11i3.1331] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Background and Objectives: Staphylococcus aureus, as an opportunistic pathogen, is the cause of a variety of diseases from mild skin infections to severe invasive infections and food poisoning. Increasing antibiotic resistance in S. aureus isolates has become a major threat to public health. The use of compounds produced by probiotics can be a solution to this problem. Thus, the purpose of this study was to investigate the effect of Saccharomyces cerevisiae on some virulence factors (biofilm, α-hemolysin, and enterotoxin A) of S. aureus.
Materials and Methods: Supernatant and lysate extracts were prepared from S. cerevisiae S3 culture. Sub-MIC concen- trations of both extracts were separately applied to S. aureus ATCC 29213 (methicillin-sensitive S. aureus; MSSA) and S. aureus ATCC 33591 (methicillin-resistant S. aureus; MRSA) strains. Biofilm formation of these strains was measured by microtiter plate assay and expression level of α-hemolysin and enterotoxin A genes (hla and sea, respectively) using real-time PCR technique.
Results: The supernatant extract has reduced both biofilm formation and expression of sea and hla genes, while lysate ex- tract had only anti-biofilm effects. The MRSA strain showed more susceptibility to yeast extracts than MSSA strain in all tests.
Conclusion: The present study exhibited favorable antagonistic effects of S. cerevisiae S3, as a probiotic yeast, on MSSA and MRSA strains. Based on the findings of this study, the compounds produced by this yeast can be used to control S. aureus infections; however, further similar studies should be conducted to confirm the findings of the present study.
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Saidi N, Owlia P, Marashi SMA, Saderi H. Inhibitory effect of probiotic yeast Saccharomyces cerevisiae on biofilm formation and expression of α-hemolysin and enterotoxin A genes of Staphylococcus aureus. Iran J Microbiol 2019; 11:246-254. [PMID: 31523409 PMCID: PMC6711867] [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] [Indexed: 11/23/2022]
Abstract
BACKGROUND AND OBJECTIVES Staphylococcus aureus, as an opportunistic pathogen, is the cause of a variety of diseases from mild skin infections to severe invasive infections and food poisoning. Increasing antibiotic resistance in S. aureus isolates has become a major threat to public health. The use of compounds produced by probiotics can be a solution to this problem. Thus, the purpose of this study was to investigate the effect of Saccharomyces cerevisiae on some virulence factors (biofilm, α-hemolysin, and enterotoxin A) of S. aureus. MATERIALS AND METHODS Supernatant and lysate extracts were prepared from S. cerevisiae S3 culture. Sub-MIC concentrations of both extracts were separately applied to S. aureus ATCC 29213 (methicillin-sensitive S. aureus; MSSA) and S. aureus ATCC 33591 (methicillin-resistant S. aureus; MRSA) strains. Biofilm formation of these strains was measured by microtiter plate assay and expression level of α-hemolysin and enterotoxin A genes (hla and sea, respectively) using real-time PCR technique. RESULTS The supernatant extract has reduced both biofilm formation and expression of sea and hla genes, while lysate extract had only anti-biofilm effects. The MRSA strain showed more susceptibility to yeast extracts than MSSA strain in all tests. CONCLUSION The present study exhibited favorable antagonistic effects of S. cerevisiae S3, as a probiotic yeast, on MSSA and MRSA strains. Based on the findings of this study, the compounds produced by this yeast can be used to control S. aureus infections; however, further similar studies should be conducted to confirm the findings of the present study.
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Affiliation(s)
- Navid Saidi
- Department of Microbiology, School of Medicine, Shahed University, Tehran, Iran
| | - Parviz Owlia
- Molecular Microbiology Research Center (MMRC), Shahed University, Tehran, Iran
| | | | - Horieh Saderi
- Molecular Microbiology Research Center (MMRC), Shahed University, Tehran, Iran,Corresponding author: Horieh Saderi, Ph.D, Molecular Microbiology Research Center (MMRC), Shahed University, Tehran, Iran. Tel: +982151212620,
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Boumaaraf H, Talha A, Saidi N, Habireche A. Experimental study of low-concentrator photovoltaic systems: electrical and thermal. Electr Eng 2018; 100:2569-2578. [DOI: 10.1007/s00202-018-0722-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2016] [Accepted: 07/16/2018] [Indexed: 09/01/2023]
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Kidar A, Abboud A, Henchiri R, Essahbi I, Chelbi F, Kidar I, Ludmila A, Bouallegue A, Othmani F, Saidi N, Yahyaoui M, Hamdi S, Jallouli O, Kidar O, Diouani F, Laouini D, Kourda M, Turki H, Denguezli M, Babba H, Bensalah A, Mokni M. La thermothérapie : une alternative séduisante et efficace dans le traitement de la leishmaniose cutanée à L. major en Tunisie. Ann Dermatol Venereol 2016. [DOI: 10.1016/j.annder.2016.09.538] [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: 10/20/2022]
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Mahdian-Shakib A, Dorostkar R, Tat M, Hashemzadeh MS, Saidi N. Differential role of microRNAs in prognosis, diagnosis, and therapy of ovarian cancer. Biomed Pharmacother 2016; 84:592-600. [PMID: 27694003 DOI: 10.1016/j.biopha.2016.09.087] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [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: 08/05/2016] [Revised: 09/20/2016] [Accepted: 09/22/2016] [Indexed: 12/19/2022] Open
Abstract
Ovarian cancer (OC) is the most lethal of malignant gynecological cancers, and has a very poor prognosis, frequently, attributable to late diagnosis and responsiveness to chemotherapy. In spite of the technological and medical approaches over the past four decades, involving the progression of several biological markers (mRNA and proteins biomarkers), the mortality rate of OC remains a challenge due to its late diagnosis, which is expressly ascribed to low specificities and sensitivities. Consequently, there is a crucial need for novel diagnostic and prognostic markers that can advance and initiate more individualized treatment, finally increasing survival of the patients. MiRNAs are non-coding RNAs that control target genes post transcriptionally. They are included in tumorigenesis, apoptosis, proliferation, invasion, metastasis, and chemoresistance. Several studies have within the last decade demonstrated that miRNAs are dysregulated in OC and have possibilities as diagnostic and prognostic biomarkers for OC. Additionally; recent studies have also focused on miRNAs as predictors of chemotherapy sensitivities and their potential as therapeutic targets. In this review, we discuss the current data involving the accumulating evidence of the altered expression of miRNAs in OC, their role in diagnosis, prognosis, and forecast of response to therapy. Given the heterogeneity of this disease, it is likely that advances in long-term survival might be also attained by translating the recent insights of miRNAs participation in OC into new targeted therapies that will have a crucial effect on the management of ovarian cancer.
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Affiliation(s)
- Ahmad Mahdian-Shakib
- Department of Immunology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Ruhollah Dorostkar
- Applied Virology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Mahdi Tat
- Applied Virology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | | | - Navid Saidi
- Department of Microbiology, Faculty of Medicine, Shahed University, Tehran, Iran
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Rehailia Blanchard A, Orliac H, Morel A, Benetreau-Grand P, Clavère P, Saidi N. Prise en charge des radiodermites aiguës : comparaison de deux stratégies au centre hospitalier universitaire de Limoges. Cancer Radiother 2015. [DOI: 10.1016/j.canrad.2015.07.062] [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: 11/27/2022]
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El Aafi N, Saidi N, Maltouf AF, Perez-Palacios P, Dary M, Brhada F, Pajuelo E. Prospecting metal-tolerant rhizobia for phytoremediation of mining soils from Morocco using Anthyllis vulneraria L. Environ Sci Pollut Res Int 2015; 22:4500-4512. [PMID: 25315928 DOI: 10.1007/s11356-014-3596-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2014] [Accepted: 09/11/2014] [Indexed: 06/04/2023]
Abstract
The aim of this work was using the legume plant Anthyllis vulneraria L. (ecotype metallicolous) as a trap plant, in order to isolate metal-tolerant rhizobial strains from metal-contaminated soils from Morocco, with pollution indexes spanning three orders of magnitude. As bioindicator, soil bacterial density was inversely correlated to the pollution index. Forty-three bulk soil bacteria and sixty two bacteria from nodules were isolated. The resistance of bacteria from nodules to heavy metals was four to ten times higher than that of bulk soil bacteria, reaching high maximum tolerable concentrations for Cd (2 mM), Cu (2 mM), Pb (7 mM), and Zn (3 mM). Besides, some strains show multiple metal-tolerant abilities and great metal biosorption onto the bacterial surface. Amplification and restriction analysis of ribosomal 16S rDNA (ARDRA) and 16S ribosomal DNA (rDNA) sequencing were used to assess biodiversity and phylogenetic position among bacteria present in nodules. Our results suggest that a great diversity of non-rhizobial bacteria (alpha- and gamma-proteobacteria) colonize nodules of Anthyllis plants in contaminated soils. Taking together, our results evidence that, in polluted soils, rhizobia can be displaced by non-rhizobial (and hence, non-fixing) strains from nodules. Thus, the selection of metal-resistant rhizobia is a key step for using A. vulneraria symbioses for in situ phytoremediation.
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Affiliation(s)
- N El Aafi
- Laboratory of Microbiology and Molecular Biology, Faculty of Sciences, University Mohamed V at Agdal, Rabat, Morocco,
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Ben Salah R, Frikha F, Snoussi M, Saidi N, Bahloul Z. [Deep vein thrombosis revealing thromboangiitis obliterans or Buerger's disease]. J Mal Vasc 2014; 39:445-7. [PMID: 24976275 DOI: 10.1016/j.jmv.2014.05.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Accepted: 04/30/2014] [Indexed: 11/16/2022]
Affiliation(s)
- R Ben Salah
- Service de médecine interne, CHU Hédi Chaker, 3029 Sfax, Tunisie.
| | - F Frikha
- Service de médecine interne, CHU Hédi Chaker, 3029 Sfax, Tunisie
| | - M Snoussi
- Service de médecine interne, CHU Hédi Chaker, 3029 Sfax, Tunisie
| | - N Saidi
- Service de médecine interne, CHU Hédi Chaker, 3029 Sfax, Tunisie
| | - Z Bahloul
- Service de médecine interne, CHU Hédi Chaker, 3029 Sfax, Tunisie
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Ben Salah R, Frikha F, Kaddour N, Saidi N, Snoussi M, Marzouk S, Jallouli M, Frigui M, Bahloul Z. [Risk factor for deep venous thrombosis in internal medicine: A retrospective study of 318 cases]. Ann Cardiol Angeiol (Paris) 2014; 63:11-16. [PMID: 24035260 DOI: 10.1016/j.ancard.2013.06.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2012] [Accepted: 06/28/2013] [Indexed: 06/02/2023]
Abstract
OBJECTIVE Venous thromboembolic disease is a common condition. Deep vein thrombosis (DVT) and pulmonary embolism are the most common manifestation but other locations may also occur. The objectives of the study were to estimate the incidence and determine the epidemiologic, topographic and associated conditions of venous thromboembolic disease in a department of internal medicine. METHODS A retrospective study of a series of 318 cases of DVT was conducted in Internal Medicine CHU Hedi Chaker, Sfax, during a period of 15 years (1996-2010). RESULTS DVT of the lower limbs was the most common location (87%). Other sites of DVT was noted in 16.35% of cases including upper limbs (19 cases), vena cava (16 cases), cerebral veins (10 cases), portal vein (10 cases) and hepatic vein (3 cases). A risk factor of VTE was found in 274 patients (86.1%). A state of thrombophilia was retained in 203 patients (63.5%). It was a hereditary thrombophilia (22.6%), an antiphospholipids syndrome (19.1%), Behçet's disease (16.4%) and neoplasia (7.2%). The study of the distribution of venous thrombosis as the seat and etiology showed that: the antiphospholipid syndrome was the most associated conditions with the upper extremity DVT (31.7%) whereas Behçet's disease was the most frequent etiology of vena cava thrombosis (7 cases) and the cerebral vein thrombosis especially in young males.
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Affiliation(s)
- R Ben Salah
- Service de médecine interne, CHU Hédi Chaker, 3029 Sfax, Tunisie.
| | - F Frikha
- Service de médecine interne, CHU Hédi Chaker, 3029 Sfax, Tunisie
| | - N Kaddour
- Service de médecine interne, CHU Hédi Chaker, 3029 Sfax, Tunisie
| | - N Saidi
- Service de médecine interne, CHU Hédi Chaker, 3029 Sfax, Tunisie
| | - M Snoussi
- Service de médecine interne, CHU Hédi Chaker, 3029 Sfax, Tunisie
| | - S Marzouk
- Service de médecine interne, CHU Hédi Chaker, 3029 Sfax, Tunisie
| | - M Jallouli
- Service de médecine interne, CHU Hédi Chaker, 3029 Sfax, Tunisie
| | - M Frigui
- Service de médecine interne, CHU Hédi Chaker, 3029 Sfax, Tunisie
| | - Z Bahloul
- Service de médecine interne, CHU Hédi Chaker, 3029 Sfax, Tunisie
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Marzouk S, Jallouli M, Loukil H, Hriz H, Saidi N, Snoussi M, El Aoud S, Frikha F, Bahloul Z. Hypertension intracrânienne au cours du lupus érythémateux systémique : à propos de trois cas. Rev Med Interne 2013. [DOI: 10.1016/j.revmed.2013.03.060] [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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Marzouk S, Elaoud S, Loukil H, Jallouli M, Hriz H, Saidi N, Snoussi M, Frikha F, Bahloul Z. Arthrite à Samonella compliquant un lupus érythémateux systémique : à propos de deux cas. Rev Med Interne 2013. [DOI: 10.1016/j.revmed.2013.03.045] [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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Omri S, Jallouli M, Chérif Y, Hriz H, Marzouk S, Snoussi M, Saidi N, El Aoud S, Frikha F, Loukil H, Bahloul Z. Évaluation des troubles anxio-dépressifs et de la qualité de vie au cours du lupus érythémateux systémique. Rev Med Interne 2013. [DOI: 10.1016/j.revmed.2013.03.059] [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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El Aoud S, Frikha F, Jallouli M, Snoussi M, Marzouk S, Saidi N, Ben Salah R, Loukil H, Hariz H, Bahloul Z. Une étiologie rare d’hémoptysie : le syndrome de Hughes-Stovin. Rev Med Interne 2013. [DOI: 10.1016/j.revmed.2013.03.186] [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: 11/24/2022]
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23
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Saidi N, Snoussi M, Frikha F, Ben Salah R, Marzouk S, Jallouli M, Frigui M, Hariz H, Eloud S, Loukil H, Maaleg M, Bahloul Z. Les complications infectieuses au cours des myopathies inflammatoires à partir d’une cohorte de 87 cas. Rev Med Interne 2013. [DOI: 10.1016/j.revmed.2013.03.007] [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: 11/15/2022]
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24
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El Aoud S, Frikha F, Snoussi M, Ben Salah R, Marzouk S, Saidi N, Jallouli M, Loukil H, Hariz H, Bahloul Z. Entéropathies exsudatives en milieu de médecine interne : à propos de cinq cas. Rev Med Interne 2013. [DOI: 10.1016/j.revmed.2013.03.172] [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: 11/25/2022]
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25
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Frikha F, Saidi N, Snoussi M, Ben Salah R, Ben Ayed M, Daoud E, Hentati Y, Makni S, Mnif Z, Boudawara T, Masmoudi H, Bahloul Z. [Antisynthetase syndrome: a report of four cases and literature review]. Rev Pneumol Clin 2012; 68:351-360. [PMID: 23062471 DOI: 10.1016/j.pneumo.2012.07.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2012] [Revised: 07/12/2012] [Accepted: 07/19/2012] [Indexed: 06/01/2023]
Abstract
The antisynthetase syndrome (ASS) includes inflammatory myopathy (polymyositis or dermatomyositis), interstitial lung disease (ILD), arthritis, Raynaud's phenomenon, and mechanic's hands, associated with antibodies against aminoacyl-tRNA-synthetases, the most well-recognized being the anti-Jo1 antibody (anti-histidyl-tRNAsynthetase). We report four cases of antisynthetase syndrome and review the clinical characteristics and prognosis factors dominated by ILD. We report the cases of four women with a mean age of 42 years (28-62 years). The interstitial lung disease was found in four cases and was objectified by CT-scan in all cases. The pulmonary symptoms were consisted of dyspnea (one case) and respiratory distress (one case). The anti-Jo1 antibodies were present in the four patients. The myopathy was concomitant with pulmonary involvement (two cases), preceded it in 6 months (one case) and in the course of evolution and after 1 month (one case). All patients received corticosteroid treatment. The immunosuppressive treatment was necessary for two patients because of the severity of the pulmonary involvement. The outcome was favorable in two patients, partially favorable in a patient who presented pulmonary fibrosis. However, one patient died after developing brain abscesses.
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Affiliation(s)
- F Frikha
- Service de médecine interne, CHU Hédi-Chaker, 3029 Sfax, Tunisie.
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Hariz H, Marzouk S, Ben Salah R, Cherif Y, Saidi N, Snoussi M, Frikha F, Jallouli M, Frigui M, Kaddour N, Bahloul Z. Les manifestations oculaires au cours de la sarcoïdose. Rev Med Interne 2012. [DOI: 10.1016/j.revmed.2012.10.293] [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: 10/27/2022]
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27
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Ben Salah R, Frikha F, Saidi N, Hammami I, Snoussi M, Marzouk S, Hariz H, Chérif Y, Jallouli M, Frigui M, Bahloul Z. Le syndrome de Vogt-Koyanagi-Harada : à propos de sept cas. Rev Med Interne 2012. [DOI: 10.1016/j.revmed.2012.03.276] [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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Frikha F, Ben Salah R, Snoussi M, Hriz H, Saidi N, Marzouk S, Jallouli M, Frigui M, Kaddour N, Bahloul Z. Les thromboses veineuses profondes au cours des maladies inflammatoires chroniques de l’intestin : à propos de 3 observations. Rev Med Interne 2012. [DOI: 10.1016/j.revmed.2012.03.140] [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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29
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Ben Salah R, Frikha F, Kaddour N, Saidi N, Snoussi M, Chérif Y, Hariz H, Marzouk S, Jallouli M, Frigui M, Bahloul Z. Thrombose veineuse profonde des membres supérieurs : à propos de 19 cas. Rev Med Interne 2012. [DOI: 10.1016/j.revmed.2012.03.143] [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: 10/28/2022]
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Saidi N, Frikha F, Ben Salah R, Kaddour N, Bahloul Z. Ostéonécrose aseptique au cours du lupus érythémateux systémique : à propos de 7 cas. Rev Med Interne 2012. [DOI: 10.1016/j.revmed.2012.03.252] [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: 11/27/2022]
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31
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Ben Salah R, Frikha F, Kaddour N, Snoussi M, Saidi N, Hariz H, Chrif Y, Marzouk S, Jallouli M, Frigui M, Bahloul Z. Thromboses veineuses profondes au cours de la maladie de Behçet : à propos d’une série de 52 cas. Rev Med Interne 2012. [DOI: 10.1016/j.revmed.2012.03.148] [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: 12/01/2022]
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32
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Saidi N, Jallouli M, Ben Salah R, Hariz H, Frikha F, Marzouk S, Frigui M, Kaddour N, Bahloul Z. Biopsies rénales itératives chez les patients atteints de néphropathie lupique : à propos de 31 cas. Rev Med Interne 2012. [DOI: 10.1016/j.revmed.2012.03.256] [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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Saidi N, Ben Salah R, Frikha F, Hariz H, Jalouli M, Kaddour N, Bahloul Z. Thromboses veineuses profondes associées aux néoplasies : à propos de 23 cas. Rev Med Interne 2012. [DOI: 10.1016/j.revmed.2012.03.163] [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: 11/15/2022]
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Frikha F, Maazoun F, Amouri M, Snoussi M, Ben Salah R, Saidi N, Kaddour N, Turki H, Bahloul Z. Profil étiologique des purpuras vasculaires (55 cas). Ann Dermatol Venereol 2011. [DOI: 10.1016/j.annder.2011.10.337] [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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35
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Snoussi M, Maazoun F, Frikha F, Kaddour N, Saidi N, Hriz H, Ben Salah R, Marzouk S, Frigui M, Bahloul Z. Myosites de Chevauchement (association myosite-connectivite) : une série de 26 cas. Rev Med Interne 2011. [DOI: 10.1016/j.revmed.2011.10.222] [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: 10/15/2022]
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Maazoun F, Frikha F, Snoussi M, Saidi N, Hriz H, Marzouk S, Frigui M, Aydi Y, Soussi M, Kaddour N, Masmoudi H, Bahloul Z. La maladie de Biermer en milieu de médecine interne : une série de 31 cas. Rev Med Interne 2011. [DOI: 10.1016/j.revmed.2011.10.173] [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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Saidi N, Kouki S, Mehri I, Ben Rejeb A, Belila A, Hassen A, Ouzari H. Biofilm and Siderophore Effects on Secondary Waste Water Disinfection. Curr Microbiol 2011; 63:337-40. [DOI: 10.1007/s00284-011-9983-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2011] [Accepted: 07/04/2011] [Indexed: 01/14/2023]
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Maazoun F, Frikha F, Salah RB, Snoussi M, Marzouk S, Jallouli M, Saidi N, Frigui M, Kaddour N, Bahloul Z. Syndrome de chevauchement lupus érythémateux systémique - myosite : à propos de 6 cas. Rev Med Interne 2011. [DOI: 10.1016/j.revmed.2011.03.256] [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: 10/28/2022]
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39
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Kchaou M, Frigui M, Jallouli M, Saidi N, Marzouk S, Maazoun F, Salah RB, Frikha F, Kaddour N, Bahloul Z. Maladie de Takayasu et grossesse : une série de 33 cas et revue de la littérature. Rev Med Interne 2011. [DOI: 10.1016/j.revmed.2011.03.135] [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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40
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Kchaou M, Marzouk S, Frigui M, Jallouli M, Saidi N, Maazoun F, Frikha F, Salah RB, Kaddour N, Bahloul Z. Histiocytose Langerhansienne mandibulaire. Rev Med Interne 2011. [DOI: 10.1016/j.revmed.2011.03.172] [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: 10/28/2022]
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41
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Saidi N, Cherif M, Jedidi N, Mahrouk M, Fumio M, Boudabous A, Hassen A. Evolution of Biochemical Parameters during Composting of Various Wastes Compost. ACTA ACUST UNITED AC 2008. [DOI: 10.3844/ajessp.2008.332.341] [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: 11/13/2022]
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Hassen A, Jamoussi F, Saidi N, Mabrouki Z, Fakhfakh E. Microbial and copper adsorption by smectitic clay--an experimental study. Environ Technol 2003; 24:1117-1127. [PMID: 14599145 DOI: 10.1080/09593330309385652] [Citation(s) in RCA: 7] [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] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The objective of this study was to quantify copper-, bacteria- and bacteriophage-binding capacities of natural clay with the aim of predicting the adsorption of heavy metals, human pathogenic bacteria and viruses by a clayey landfill liner. X-ray diffraction analysis of six natural clays showed that the dominant phase in all deposits consists of smectites together with illite, kaolin and, sometimes, palygorskite and sepiolite. The specific surface areas of different clay substrates were very high ranging from 293 to 351 m2 g(-1), and indicating a high proportion of phyllosilicates, consisting especially of smectites. The physico-chemical identification of separated smectites showed a high potential adsorbent character indicative of a large industrial use. The Kb12 smectite substrate chosen arbitrarily among six separated substrates, appeared as an excellent copper adsorbent. Copper was adsorbed to clay in a proportion ranging from 94.6 to 96.0% with an average of 95.1% and its adsorption occurred rapidly in less than 30 min. Organic contents of the clay substrate, evaluated as 17% of dry mass, may contribute and enhance copper adsorption. Different elution protocols using distilled water, 2 and/or 5% nitric acid revealed that while nitric acid resulted in the removal of more than 59% of the metal at the lower concentration and its complete depletion with a further elution at the higher concentration, distilled water alone was unable to remove more than 1% of adsorbed copper. This finding suggested that copper ions form high-energy bonds with layer-silicate surfaces. Interestingly, the use of a regenerated substrate as copper adsorbent subsequent to abundant washings of the used substrate consecutively, with 0.1 N HNO3 and distilled water, reduced copper adsorption by approximately 14%, suggesting a slight disturbance of clay initial structure. Batch adsorption experiments with phage T7 and raw clay Kb12 showed that the tested clay substrate appeared as a relatively moderate phage adsorbent since the quantity of adsorbed phage averaged 98.2 +/- 0.88% (2 log10 retention) as measured by infectivity for Escherichia coli ATCC 11303. As shown by two types of separating procedures, natural sedimentation and a low speed centrifugation, bacteriophage particles were bound essentially to fine and not to relatively coarse particles of the clay suspension. The retention capacity of purified clay Kb12 appeared low, with average values lower than 60 and 50%, for Pseudomonas aeruginosa ATCC 15442 and Bacillus cereus ATCC 1135, respectively. A significant increase of retention, in the order of 30%, was found for both bacteria when the mixture clay-bacteria was incubated at laboratory temperature for 6 hours.
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Affiliation(s)
- A Hassen
- Institut National de Recherche Scientifique et Technique, Laboratoire Eau et Environnement, BP 24-1082, Cité Mahrajène, Tunis, Tunisia
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Hassen A, Jerboui Z, Chérif M, Saidi N, Gharbi S, Boudabous A. Impact of Heavy Metals on the Selective Phenotypical Markers of Pseudomonas aeruginosa. Microb Ecol 2001; 42:99-107. [PMID: 12035085 DOI: 10.1007/s002480000067] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2000] [Accepted: 07/25/2000] [Indexed: 05/23/2023]
Abstract
The aim of this study was to characterize the impact of heavy metals on phenotypical markers of Pseudomonas aeruginosa. Twenty-two isolates of P. aeruginosa, either clinical (20) or secondary treated wastewater (2), were used to inoculate micro-ecosystems of sterile distilled water or secondary waste effluent in the presence of subminimal inhibitory concentrations of a variety of heavy metals commonly encountered in the aquatic naturally habitat (Ca2+, Co2+, Cr3+, Cu2+, Hg2+, Ni2+, Zn2+). Micro-ecosystems were exposed to visible light at laboratory temperature and individual strains were reisolated after a 1-, 3-, or 6-month period. The re-isolates (129) were characterized using hierarchical classification analysis in order to define affinities among variants of P. aeruginosa. Subsequently, discriminant analysis was used to detect eventual relationships among the different phenotypical markers studied. Results of the hierarchical classification, based on qualitative or quantitative approaches, showed clearly that incubation of P. aeruginosa in the presence of heavy metals altered the studied phenotypical markers, namely serotype, phage type, MIC of metals, and pyocin type. Discriminant analysis showed that the studied phenotypical markers could be classified into four clusters: C1 (L1 and L2 phage types, Hg tolerance and/or resistance, S2 serotype), C2 (P2 pyocin type, Cd tolerance and/or resistance, S1 serotype), C3 (Co and Cr tolerance and/or resistance) and C4 (P1 pyocin type, Ni, Zn, and Cu tolerance and/or resistance).
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Affiliation(s)
- A. Hassen
- Laboratoire Eau et Environnement, Institut National de Recherche Scientifique et Technique, BP 95 - 2050, Hammam-Lif, Tunisia
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Saidi N, Samel M, Siigur J, Jensen PE. Lebetase, an alpha(beta)-fibrin(ogen)olytic metalloproteinase of Vipera lebetina snake venom, is inhibited by human alpha-macroglobulins. Biochim Biophys Acta 1999; 1434:94-102. [PMID: 10556563 DOI: 10.1016/s0167-4838(99)00164-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The effects of the plasma proteinase inhibitors alpha(2)-macroglobulin (alpha(2)M) and the alpha(2)M-related pregnancy zone protein (PZP) were evaluated towards the metalloproteinase lebetase, isolated from Vipera lebetina venom. We demonstrate that lebetase interacts with both inhibitors. Cleavage of alpha(2)M by lebetase resulted in the formation of 90-kDa fragments, and covalent complexes of alpha(2)M with lebetase were observed. The proteolytic activity of lebetase against fibrinogen and azocasein could be inhibited by alpha(2)M. Cleavage of PZP also resulted in the formation of 90-kDa fragments, and complexes of both dimer and tetramer forms of PZP with lebetase were detected. The amino acid sequence identification of the sites of specific proteolysis of alpha(2)M and PZP demonstrate that the cleavage sites are within the bait regions of both proteins. Lebetase I cleaves between Arg(696)-Leu(697), which is one of the most common cleavage sites in alpha(2)M by proteinases. The other two cleavage sites in alpha(2)M by lebetase are Gly(679)-Leu(680) and His(694)-Ala(695). The cleavage between Pro(689)-Gln(690) is the only cleavage site identified in PZP. In that lebetase is an anticoagulation agent in vivo, we propose that the interaction of lebetase with alpha(2)M may suggest a reduced fibrin(ogen)olytic activity of lebetase in human.
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Affiliation(s)
- N Saidi
- Department of Immunology, Umeå University, Umeå, Sweden
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Tu HN, Saidi N, Leiutaud T, Bensaid S, Menival V, Duvaldestin P. Nitrous oxide increases endotracheal cuff pressure and the incidence of tracheal lesions in anesthetized patients. Anesth Analg 1999; 89:187-90. [PMID: 10389801 DOI: 10.1097/00000539-199907000-00033] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
UNLABELLED The pressure in air-filled endotracheal cuffs increases steadily throughout general anesthesia with nitrous oxide (N2O). High cuff pressures can be responsible for local ischemia, which may induce tracheal mucosal injury. In this study, cuff pressure was monitored in anesthetized patients, and postanesthesia endotracheal lesions were assessed by endoscopy. Sixty-five patients undergoing general anesthesia with tracheal intubation >1 h in duration were randomized into two groups. The endotracheal tube cuff was inflated to 30-40 cm H2O with air in Group 1 (n = 33) and with a gas mixture (N2O 50% in oxygen) in Group 2 (n = 32). At the time of tracheal extubation, a fiberoptic examination via the endotracheal tube was performed by an independent observer. Aspects of trachea at the level of cuff contact area were scored as 0 = normal, 1 = mucosal erythema or edema, 2 = mucosal erosion or hemorrhage, 3 = mucosal erosion or hemorrhage on both anterior and posterior tracheal walls. Cuff pressure increased throughout the procedure (P<0.01) in Group 1 and remained stable in Group 2. In Group 1, tracheal lesions in the area of the cuff were more frequent than they were in Group 2 (79% vs. 37%; P<0.001). Tracheal injury was correlated to cuff pressure (r = 0.62, P<0.001). No postoperative respiratory complication was observed in any patient. In patients anesthetized with N2O, the inflation of the tracheal tube cuff with a gas mixture of the same composition as the inhaled mixture can prevent excessive cuff pressure and reduce the incidence of tracheal injury. IMPLICATIONS In patients anesthetized with nitrous oxide, the inflation of the tracheal tube cuff with a gas mixture of the same composition as the inhaled mixture can prevent excessive cuff pressure and reduce the incidence of tracheal injury.
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Affiliation(s)
- H N Tu
- Department of Anesthesia, Henri-Mondor Hospital, Creteil, France
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Tu HN, Saidi N, Lieutaud T, Bensaid S, Menival V, Duvaldestin P. Nitrous Oxide Increases Endotracheal Cuff Pressure and the Incidence of Tracheal Lesions in Anesthetized Patients. Anesth Analg 1999. [DOI: 10.1213/00000539-199907000-00033] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Hassen A, Jedidi N, Saidi N, Kallali H, Boudabous A, Ennabli M. [Isolation of salmonella in wastewaters and study of indicator bacteria survival in soils]. Arch Inst Pasteur Tunis 1996; 73:173-7. [PMID: 9640497] [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: 02/07/2023]
Abstract
Detection of salmonella in wastewaters was done in semi-industrial pilot plant. In parallel, survival of indicator bacteria (feacal coliforms and feacal streptococci) in the soil was evaluated into a laboratory incubation device. Results revealed the isolation of 21 strains of salmonella in 7 campaigns of analysis on DCLS media, and 6 strains on lactose-green-brilliant and phenol red media in 2 campaigns. Salmonella were recovered in all the lines of wastewater treatment. The study led on the survival of coliforms and streptococci bacteria allowed the conclusion that feacal streptococci introduced by wastewaters were more qualified to survive in the soil than feacal coliforms. On the other hand, feacal coliforms appeared more sensitive to the biological factors of the soil than feacal streptococci. The ambient temperature of incubation situated between 12 and 24 degrees C seemed suitable for bacteria survival in the soils.
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Affiliation(s)
- A Hassen
- Institut National de Recherche Scientifique et Technique (URNE), Cité Mahrajène, Tunis
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Delbos M, Gipouloux JD, Saidi N. The role of the glycoconjugates in the migration of anuran amphibian germ cells. Development 1984. [DOI: 10.1242/dev.82.1.119] [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]
Abstract
1. The presence of a large amount of glycoconjugates on the anuran amphibian germ cells was demonstrated using fluorescein isothiocyanate lectins binding specifically to D-galactose and at a lower level, by other lectins binding specifically to N-acetyl-galactosamine.
2. Glycoconjugates including D-galactose were found near the pseudopodial expansions and in the extracellular space, between germ cells and follicular cells. They were also disseminated in the cytoplasm.
3. The injection of PNA lectin (from Arachis hypogea) into the endoderm inhibited the migration of 90 % of the germ cells. This inhibition was lectin-concentration dependent. Ultrastructural study of germ cells, the migration of which was inhibited, showed that they were degenerating. These results suggest that glycoconjugates are related to the migratory activity of germ cells.
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Affiliation(s)
- M. Delbos
- Laboratoire de Biologie Animale, Université de Bordeaux I 33405 Talence Cedex, France
| | - J.-D. Gipouloux
- Laboratoire de Biologie Animale, Université de Bordeaux I 33405 Talence Cedex, France
| | - N. Saidi
- Faculté des Sciences de Oujda, Maroc, France
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Delbos M, Gipouloux JD, Saidi N. The role of the glycoconjugates in the migration of anuran amphibian germ cells. J Embryol Exp Morphol 1984; 82:119-29. [PMID: 6436429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The presence of a large amount of glycoconjugates on the anuran amphibian germ cells was demonstrated using fluorescein isothiocyanate lectins binding specifically to D-galactose and at a lower level, by other lectins binding specifically to N-acetyl-galactosamine. Glycoconjugates including D-galactose were found near the pseudopodial expansions and in the extracellular space, between germ cells and follicular cells. They were also disseminated in the cytoplasm. The injection of PNA lectin (from Arachis hypogea) into the endoderm inhibited the migration of 90% of the germ cells. This inhibition was lectin-concentration dependent. Ultrastructural study of germ cells, the migration of which was inhibited, showed that they were degenerating. These results suggest that glycoconjugates are related to the migratory activity of germ cells.
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