1
|
Hammami I, Timoumi O, Larbi I, Rekik S, Maghzaoua D, Gharbi M. First report of Sarcocystis falcatula in naturally infected Razorbill auks (Alca torda) collected in Tunisian Mediterranean Sea shores. Parasitol Res 2024; 123:193. [PMID: 38656629 DOI: 10.1007/s00436-024-08214-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Accepted: 04/16/2024] [Indexed: 04/26/2024]
Abstract
Sarcocystis spp. are apicomplexan cyst-forming parasites that can infect numerous vertebrates, including birds. Sarcosporidiosis infection was investigated in three muscles (breast, right and left thigh muscle) and one organ (heart) of four Razorbill auks (Alca torda) stranded between November and December 2022 on the shores of the Mediterranean Sea in Nabeul and Bizerte governorates, Northern Tunisia. Two of the four tested A. torda were PCR positive for 18S rRNA Sarcocystis spp. gene. Among the examined 16 muscles/organs, only one breast and one right thigh were Sarcocystis spp. PCR-positive (12.5% ± 8.3, 2/16). Our results showed a relatively high molecular prevalence of Sarcocystis spp. in Razorbill auks (A. torda). Sarcocystis spp. sequence described in the present study (GenBank number: OR516818) showed 99.56-100% identity to Sarcocystis falcatula. In conclusion, our results confirmed the infection of Razorbill auks (A. torda) by S. falcatula. Further research is needed on different migratory seabirds' species in order to identify other Sarcocystis species.
Collapse
Affiliation(s)
- Ines Hammami
- Laboratory of Parasitologie, National School of Veterinary Medicine of Sidi Thabet, Univ. Manouba, Institution de la Recherche et de l'Enseignement Supérieur Agricoles, 2020, Sidi Thabet, Tunisia.
| | - Oumayma Timoumi
- Laboratory of Parasitologie, National School of Veterinary Medicine of Sidi Thabet, Univ. Manouba, Institution de la Recherche et de l'Enseignement Supérieur Agricoles, 2020, Sidi Thabet, Tunisia
| | - Imen Larbi
- Laboratory of Epidemiology and Veterinary Microbiology, LR 11 IPT 03, Institut Pasteur de Tunis, Universite de Tunis El Manar (UTM), Tunis, Tunisia
| | - Syrine Rekik
- Laboratory of Parasitologie, National School of Veterinary Medicine of Sidi Thabet, Univ. Manouba, Institution de la Recherche et de l'Enseignement Supérieur Agricoles, 2020, Sidi Thabet, Tunisia
| | - Dhekra Maghzaoua
- Laboratory of Parasitologie, National School of Veterinary Medicine of Sidi Thabet, Univ. Manouba, Institution de la Recherche et de l'Enseignement Supérieur Agricoles, 2020, Sidi Thabet, Tunisia
| | - Mohamed Gharbi
- Laboratory of Parasitologie, National School of Veterinary Medicine of Sidi Thabet, Univ. Manouba, Institution de la Recherche et de l'Enseignement Supérieur Agricoles, 2020, Sidi Thabet, Tunisia
| |
Collapse
|
2
|
Rekik S, Hammami I, Timoumi O, Maghzaoua D, Khamassi Khbou M, Schulz A, Groschup MH, Gharbi M. A Review on Crimean-Congo Hemorrhagic Fever Infections in Tunisia. Vector Borne Zoonotic Dis 2024. [PMID: 38457645 DOI: 10.1089/vbz.2023.0079] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/10/2024] Open
Abstract
Crimean-Congo hemorrhagic fever (CCHF) is a zoonotic tick-borne disease, caused by an arbovirus of the genus Orthonairovirus and the family Nairoviridae. Crimean-Congo hemorrhagic fever virus (CCHFV) is widespread in several regions of the world. While the virus is not pathogenic to all susceptible livestock and wild mammals, it can lead to severe hemorrhagic fever in humans. In this review, we compiled published data on CCHFV infections in humans, animals, and ticks in Tunisia. Based on that, we discussed the epidemiology and the distribution patterns of CCHFV infections highlighting the risk factors for this virus in the country. CCHF infection prevalence in humans was estimated to 2.76% (5/181) and 5% (2/38) in Tunisian febrile patients and Tunisian slaughterhouse workers, respectively. Concurrently, seroprevalence in domestic ungulates (sheep, goats, cattle, and dromedaries) ranged from zero to 89.7%, and only one Hyalomma impeltatum tick specimen collected from dromedaries in southern Tunisian was positive for CCHFV by reverse transcriptase-polymerase chain reaction (0.6%; 1/165). As Tunisian studies on CCHFV are geographically scattered and limited due to very small sample sizes, further studies are needed to improve the knowledge on the epidemiology of CCHF in Tunisia.
Collapse
Affiliation(s)
- Syrine Rekik
- Laboratory of Parasitology, Zoonoses, and Sanitary Regulation, University of Manouba, Institution of Agricultural Research and Higher Education, National School of Veterinary Medicine of Sidi Thabet, Sidi Thabet, Tunisia
| | - Ines Hammami
- Laboratory of Parasitology, Zoonoses, and Sanitary Regulation, University of Manouba, Institution of Agricultural Research and Higher Education, National School of Veterinary Medicine of Sidi Thabet, Sidi Thabet, Tunisia
| | - Oumayma Timoumi
- Laboratory of Parasitology, Zoonoses, and Sanitary Regulation, University of Manouba, Institution of Agricultural Research and Higher Education, National School of Veterinary Medicine of Sidi Thabet, Sidi Thabet, Tunisia
| | - Dhekra Maghzaoua
- Laboratory of Parasitology, Zoonoses, and Sanitary Regulation, University of Manouba, Institution of Agricultural Research and Higher Education, National School of Veterinary Medicine of Sidi Thabet, Sidi Thabet, Tunisia
| | - Médiha Khamassi Khbou
- Laboratory of Infectious Animal Diseases, Zoonoses, and Sanitary Regulation, University of Manouba, Institution of Agricultural Research and Higher Education, National School of Veterinary Medicine of Sidi Thabet, Sidi Thabet, Tunisia
| | - Ansgar Schulz
- Friedrich-Loeffler-Institut, Institute of Novel and Emerging Infectious Diseases, Insel Riems, Germany
| | - Martin H Groschup
- Friedrich-Loeffler-Institut, Institute of Novel and Emerging Infectious Diseases, Insel Riems, Germany
| | - Mohamed Gharbi
- Laboratory of Parasitology, Zoonoses, and Sanitary Regulation, University of Manouba, Institution of Agricultural Research and Higher Education, National School of Veterinary Medicine of Sidi Thabet, Sidi Thabet, Tunisia
| |
Collapse
|
3
|
Hammami I, Ciuca L, Maurelli MP, Romdhane R, Sassi L, Rjeibi MR, Farhat N, Simo AK, Rinaldi L, Rekik M, Gharbi M. First morphometric and molecular characterization of Fasciola spp. in Northwest Tunisia. Parasitol Res 2023; 122:2467-2476. [PMID: 37642769 DOI: 10.1007/s00436-023-07933-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 07/31/2023] [Indexed: 08/31/2023]
Abstract
The aim of this study was to characterize the Tunisian Fasciola spp. flukes by morphometric and molecular analyses. Flukes were collected from livers of sheep slaughtered in Sejnane slaughterhouses (Bizerte gouvernorate, Northwest Tunisia) between January and March 2021.Five morphometric parameters were determined for all the liver flukes, as follows: (i) total body length (BL), (ii) distance between ventral sucker and the tail (VS-T), (iii) distance between oral sucker and ventral sucker (OS-VS), (iv) abdomen diameter (AD), (v) tail diameter (TD) and the body length to width ratio (BL/BW). Molecular identification of the fluke specimens was carried out by polymerase chain reaction, restriction fragment polymorphism (PCR-RFLP) of a 680 bp sequence of the internal transcribes spacer 1 (ITS1) gene and by amplification, sequencing, and phylogenetic analysis of a 500 bp sequence of the ITS2 gene. Morphometric measurements showed that the mean of the total body length of the adult flukes was 21.1 ± 2.7 mm with minimum and maximum lengths of 13 and 31 mm, respectively. The PCR-RFLP analysis revealed a single profile consisting of three bands of approximately 370, 100, and 60 bp. Fasciola sequences described in the present study (GenBank numbers: OQ457027 and OQ457028) showed 99.58-100% identity to Fasciola hepatica. In conclusion, the results of this study show that molecular and phylogenetic analyses confirm the presence of a single species of F. hepatica in the Sejnane region Northwest of Tunisia. However, further studies are needed to identify the occurrence of Fasciola species in other Tunisian regions.
Collapse
Affiliation(s)
- Ines Hammami
- Laboratoire de Parasitologie, École Nationale de Médecine Vétérinaire de Sidi Thabet, Univ Manouba, 2020, Sidi Thabet, Tunisia.
- Faculty of Sciences of Tunis, University of Tunis El Manar, 2092 Manar II, Tunis, Tunisia.
| | - Lavina Ciuca
- Unit of Parasitology and Parasitic Diseases, Department of Veterinary Medicine and Animal Production, University of Naples Federico II, CREMOPAR, Via Delpino, 1, 80137, Napoli, Italy
| | - Maria Paola Maurelli
- Unit of Parasitology and Parasitic Diseases, Department of Veterinary Medicine and Animal Production, University of Naples Federico II, CREMOPAR, Via Delpino, 1, 80137, Napoli, Italy
| | - Rihab Romdhane
- Laboratoire de Parasitologie, École Nationale de Médecine Vétérinaire de Sidi Thabet, Univ Manouba, 2020, Sidi Thabet, Tunisia
| | - Limam Sassi
- Laboratoire de Parasitologie, École Nationale de Médecine Vétérinaire de Sidi Thabet, Univ Manouba, 2020, Sidi Thabet, Tunisia
| | - Mohamed Ridha Rjeibi
- Laboratoire de Parasitologie, École Nationale de Médecine Vétérinaire de Sidi Thabet, Univ Manouba, 2020, Sidi Thabet, Tunisia
- Laboratoire de Parasitologie, Institut de La Recherche Vétérinaire de Tunisie, 20 Rue de Jebel Lakdhar, La Rabta, 1006, Tunis, Tunisia
| | - Nadia Farhat
- Circonscription de la production animale, 7010 Sejnane, Bizerte, Tunisia
| | - Alain Kouam Simo
- Faculté des Sciences de la Santé, Université des Montagnes, BP, 208, Bangangté, Cameroon
| | - Laura Rinaldi
- Unit of Parasitology and Parasitic Diseases, Department of Veterinary Medicine and Animal Production, University of Naples Federico II, CREMOPAR, Via Delpino, 1, 80137, Napoli, Italy
| | - Mourad Rekik
- International Center for Agricultural Research in the Dry Areas (ICARDA), Amman, Jordan
| | - Mohamed Gharbi
- Laboratoire de Parasitologie, École Nationale de Médecine Vétérinaire de Sidi Thabet, Univ Manouba, 2020, Sidi Thabet, Tunisia
| |
Collapse
|
4
|
Bouassida M, Mnif I, Hammami I, Triki MA, Ghribi D. Bacillus subtilis SPB1 lipopeptide biosurfactant: antibacterial efficiency against the phytopathogenic bacteria Agrobacterium tumefaciens and compared production in submerged and solid state fermentation systems. Food Sci Biotechnol 2023; 32:1595-1609. [PMID: 37637836 PMCID: PMC10449737 DOI: 10.1007/s10068-023-01274-5] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 01/12/2023] [Accepted: 01/30/2023] [Indexed: 03/08/2023] Open
Abstract
Bacillus subtilis SPB1 derived biosurfactants (BioS) proved its bio-control activity against Agrobacterium tumefaciens using tomato plant. Almost 83% of disease symptoms triggered by Agrobacterium tumefaciens were reduced. Aiming potential application, we studied lipopeptide cost-effective production in both fermentations systems, namely the submerged fermentation (SmF) and the solid-state fermentation (SSF) as well as the use of Aleppo pine waste and confectionery effluent as cheap substrates. Optimization studies using Box-Behnken (BB) design followed by the analysis with response surface methodology were applied. When using an effluent/sea water ratio of 1, Aleppo pine waste of 14.08 g/L and an inoculum size of 0.2, a best production yield of 17.16 ± 0.91 mg/g was obtained for the SmF. While for the SSF, the best production yield of 27.59 ± 1.63 mg/g was achieved when the value of Aleppo pine waste, moisture, and inoculum size were, respectively, equal to 25 g, 75%, and 0.2. Hence, this work demonstrated the superiority of SSF over SmF.
Collapse
Affiliation(s)
- Mouna Bouassida
- Laboratoire d’Amélioration des Plantes et Valorisation des Agro-Ressources, Ecole Nationale d’Ingénieurs de Sfax, Sfax, Tunisie
- Bioréacteur couple à un ultra filtre, Ecole Nationale D’Ingénieurs de Sfax, Sfax, Tunisie
| | - Inès Mnif
- Laboratoire de Biochimie et Génie Enzymatique des Lipases, Ecole Nationale d’Ingénieurs de Sfax, Sfax, Tunisie
- Faculté des Sciences de Gabes, Université de Gabes, Gabes, Tunisie
| | - Ines Hammami
- Department of Biology, College of Science, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam, 31441 Saudi Arabia
| | - Mohamed-Ali Triki
- Institut de l’Olivier-Institution of Agricultural Research and Higher Education-Tunisia-Protection of Plants Researcher, Tunis, Tunisie
| | - Dhouha Ghribi
- Laboratoire d’Amélioration des Plantes et Valorisation des Agro-Ressources, Ecole Nationale d’Ingénieurs de Sfax, Sfax, Tunisie
- Institut Supérieur de Biotechnologie de Sfax, Université de Sfax, Sfax, Tunisie
| |
Collapse
|
5
|
Hammami I, Farjot G, Naveau M, Rousseaud A, Shepard W, Nioche P, Chatre L, Prangé T, Katz I, Colloc'h N. Identification of potentially bioactive argon binding sites in protein families. Acta Cryst Sect A 2022. [DOI: 10.1107/s2053273322093147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2023]
|
6
|
Carter J, Re F, Hammami I, Littlejohns T, Arnold M, Clarke R. Effects of within-person variability in spot urinary sodium measurements on the associations with blood pressure and risk of cardiovascular disease in 0.5 Million adults in UK Biobank. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.2857] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Randomised control trials have demonstrated direct positive and causal associations of 24-hr measurements of urinary sodium excretion on blood pressure. However, prospective studies, which often used spot (not 24-hr) measurements of urinary sodium, have reported J-shaped associations with higher risks of cardiovascular disease (CVD) at sodium intake <4 g/day. The reasons for the discrepant results are not fully understood, but have prompted some to question the World Health Organisation's recommendations to restrict sodium intake to <2.3g/day.
Purpose
We examined the effects of within-person variability in spot urinary sodium (UNa) measurements on immediate and delayed associations of UNa with blood pressure at baseline and at resurvey, and with incident cardiovascular disease in the UK Biobank (UKB).
Methods
Baseline spot urine samples were measured in 502,619 adults at baseline and in 20,346 participants who were resurveyed at 4 years after baseline. Linear regression was used to assess associations of baseline UNa measurements with systolic blood pressure (SBP; mmHg) at baseline and at resurvey. Cox regression was used estimate the associations between baseline measures of UNa with incident CVD events (recorded from linkage with hospital records). All analyses were adjusted for confounders and corrected for regression dilution bias.
Results
After excluding participants with prevalent diseases, the primary analyses involved 386,060 adults who were followed-up for a median of 7.8 years, during which ∼13,000 CVD events occurred. Estimated mean (SD) urinary sodium excretion was 77.4 mmol/L (SD 44.4, IQR = 42.8–103.7 mmol/L), and mean SBP/DBP were 137.5/82.3 (SD 18.5/10.1) mmHg, respectively. Within-person variability in UNa was high, with a self-correlation of 0.35 at 4 years between measurements. After adjustment for confounders and correction for regression dilution bias, a 100 mmol/L higher UNa was associated with an immediate 3.2 mmHg higher SBP (95% confidence interval [CI]: 2.8–3.6) in cross-sectional analyses (Figure 1). However, the corresponding associations of baseline UNa with SBP at resurvey was completely attenuated (p=0.20). The predicted risk of CVD was 1.06 (95% CI 1.06–1.07, p<0.001) for a 3.2 mmHg higher SBP, but the observed risk for a 100 mmol/L higher UNa was 0.95 (95% CI 0.82–1.10, p=0.47) (Figure 1).
Conclusions
While spot measurements of UNa were strongly associated with immediate effects on SBP, the magnitude of within-person variability in UNa precluded detection of associations with SBP several years after baseline or with risk of CVD. The extreme within-person variability in spot UNa may explain the discrepant results of the trials and observational studies of sodium and blood pressure.
Figure 1. Spot UNa with SBP and CVD in UK Biobank
Funding Acknowledgement
Type of funding source: Public grant(s) – National budget only. Main funding source(s): Core funding from the Medical Research Council-Population Health Research Unit, British Heart Foundation
Collapse
Affiliation(s)
- J Carter
- University of Oxford, Oxford, United Kingdom
| | - F Re
- University of Oxford, Oxford, United Kingdom
| | - I Hammami
- University of Oxford, Oxford, United Kingdom
| | | | - M Arnold
- University of Oxford, Oxford, United Kingdom
| | - R Clarke
- University of Oxford, Oxford, United Kingdom
| |
Collapse
|
7
|
Hammami I, Mafham M, Armitage J, Parish S. P656Risk of major gastrointestinal bleed in relation to vascular disease risk in 0.5M UK Biobank participants. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz747.0263] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Low-dose aspirin is of established benefit for secondary prevention of cardiovascular events but in primary prevention the benefit is finely balanced with the hazard of major bleeds, and in particular gastrointestinal (GI) bleeds.
Purpose
To investigate non-vascular, non-genetic risk factors for major GI bleeds and derive a score for GI bleed risk which may help identify who will receive most net benefit from aspirin.
Methods
In the UK Biobank prospective study of 0.5M participants aged 40–69 at recruitment, prior history of cardiovascular disease, bleeds and other medical conditions was ascertained from self-reported diagnoses and electronic heath records (EHR) prior to recruitment. Major GI bleed during 6 years of follow-up was defined based on coded diagnoses and duration of hospital stay. Non-vascular risk factors for bleed were identified from amongst 100 baseline and prior disease factors using a stepwise regression with adjustment for established vascular risk factors, aspirin and warfarin use. 10-way cross-validation was used when making risk scores.
Results
Among the primary prevention population without prior intracranial bleed, serious extracranial bleed or gastrointestinal ulcer in the 6 months prior to recruitment, 1682 (0.06%/y) participants had a major GI bleed (1006 upper GI, 676 lower GI) with a mean stay in hospital of 3.2 days. Antiplatelet use (in 11%) and anticoagulant use (in 1%), were associated with 1.5 and 4 fold risks of GI bleed, respectively. Stepwise regression identified a non-vascular risk score for major bleed with a 4-fold risk ratio across fifths (Figure). But the score was also associated with a 2-fold risk ratio for major vascular events.
Conclusions
Major GI bleeds cause substantial morbidity. A 4-fold difference in bleed risk across quintiles was distinguishable by a score based largely on EHR prior disease information and frailty measures. This score is applicable in other contexts and will be applied in the ASCEND randomised trial of daily aspirin to provide randomized evidence of the net benefit of aspirin in different risk categories. However, vascular risk factors predicted risk of GI bleeds, and non-vascular risk factors for GI bleed predicted risk of major vascular events; so the net benefit from aspirin may vary only modestly across categories by vascular and bleed risks.
Collapse
Affiliation(s)
- I Hammami
- University of Oxford, Nuffield Department of Population Health, Oxford, United Kingdom
| | - M Mafham
- University of Oxford, Nuffield Department of Population Health, Oxford, United Kingdom
| | - J Armitage
- University of Oxford, MRC Population Health Research Unit, Nuffield Department of Population Health, Oxford, United Kingdom
| | - S Parish
- University of Oxford, MRC Population Health Research Unit, Nuffield Department of Population Health, Oxford, United Kingdom
| |
Collapse
|
8
|
Hsouna AB, Touj N, Hammami I, Dridi K, Al-Ayed AS, Hamdi N. Chemical Composition and in vivo Efficacy of the Essential Oil of Mentha piperita L. in the Suppression of Crown Gall Disease on Tomato Plants. J Oleo Sci 2019; 68:419-426. [DOI: 10.5650/jos.ess18261] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Anis Ben Hsouna
- Department of Life Sciences, Faculty of Sciences of Gafsa
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax, University of Sfax
| | - Nedra Touj
- Research Laboratory of Environmental Sciences and Technologies (LR16ES09), Higher Institute of Environmental Sciences and Technology, University of Carthage
| | - Ines Hammami
- Department of biology, College of science, Imam Abdul Rahman Bin Faisal University
- Basic and Applied Scientific Research Center,Imam Abdul Rahman Bin Faisal University
| | - Kahireddine Dridi
- Chemistry Department, College of Science and Arts, Qassim University
| | | | - Naceur Hamdi
- Research Laboratory of Environmental Sciences and Technologies (LR16ES09), Higher Institute of Environmental Sciences and Technology, University of Carthage
- Chemistry Department, College of Science and Arts, Qassim University
| |
Collapse
|
9
|
Affiliation(s)
- I Hammami
- University of Oxford, Nuffield Department of Population Health, Oxford, United Kingdom
| | - B Lacey
- University of Oxford, Nuffield Department of Population Health, Oxford, United Kingdom
| | - S Lewington
- University of Oxford, Nuffield Department of Population Health, Oxford, United Kingdom
| |
Collapse
|
10
|
Hammami I, Nahdi A, Atig F, El May A, El May MV. Garlic (Allium sativum) feeding impairs Sertoli cell junctional proteins in male Wistar rat testis: microscopy study. Andrologia 2016; 48:1281-1288. [DOI: 10.1111/and.12574] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/05/2016] [Indexed: 01/03/2023] Open
Affiliation(s)
- I. Hammami
- Research Unit n 01/UR/08-07; Faculty of Medicine; Tunis El Manar University; Tunis Tunisia
| | - A. Nahdi
- Research Unit n 01/UR/08-07; Faculty of Medicine; Tunis El Manar University; Tunis Tunisia
| | - F. Atig
- Department of Cytogenetic and Reproductive Biology; Farhat Hached Hospital; Sousse Tunisia
| | - A. El May
- Salah Azaiez Cancer Institute; Tunis Tunisia
| | - M. V. El May
- Research Unit n 01/UR/08-07; Faculty of Medicine; Tunis El Manar University; Tunis Tunisia
| |
Collapse
|
11
|
Mnif I, Hammami I, Triki MA, Azabou MC, Ellouze-Chaabouni S, Ghribi D. Antifungal efficiency of a lipopeptide biosurfactant derived from Bacillus subtilis SPB1 versus the phytopathogenic fungus, Fusarium solani. Environ Sci Pollut Res Int 2015; 22:18137-18147. [PMID: 26178831 DOI: 10.1007/s11356-015-5005-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [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: 05/26/2015] [Accepted: 06/30/2015] [Indexed: 06/04/2023]
Abstract
Bacillus subtilis SPB1 lipopeptides were evaluated as a natural antifungal agent against Fusarium solani infestation. In vitro antifungal assay showed a minimal inhibitory concentration of about 3 mg/ml with a fungicidal mode of action. In fact, treatment of F. solani by SPB1 lipopeptides generated excessive lyses of the mycelium and caused polynucleation and destruction of the related spores together with a total inhibition of spore production. Furthermore, an inhibition of germination potency accompanied with a high spore blowing was observed. Moreover, in order to be applied in agricultural field, in vivo antifungal activity was proved against the dry rot potato tubers caused by F. solani. Preventive treatment appeared as the most promising as after 20 days of fungi inoculation, rot invasion was reduced by almost 78%, in comparison to that of non-treated one. When treating infected tomato plants, disease symptoms were reduced by almost 100% when applying the curative method. Results of this study are very promising as it enables the use of the crude lipopeptide preparation of B. subtilis SPB1 as a potent natural fungicide that could effectively control the infection of F. solani in tomato and potato tubers at a concentration similar to the commercial fungicide hymexazol and therefore prevent the damage of olive tree.
Collapse
Affiliation(s)
- Ines Mnif
- Unit "Enzymes and Bioconversion", National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia.
- Higher Institute of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia.
| | - Ines Hammami
- Higher School of Agriculture of Kef, 7119, Kef, Tunisia
| | - Mohamed Ali Triki
- Laboratory "Amélioration et Protection des Ressources Génétiques de l'Olivier", Sfax BP1087, Institut of Olivier, IRESA - University of Sfax, Sfax, Tunisia
| | - Manel Cheffi Azabou
- Laboratory "Amélioration et Protection des Ressources Génétiques de l'Olivier", Sfax BP1087, Institut of Olivier, IRESA - University of Sfax, Sfax, Tunisia
| | - Semia Ellouze-Chaabouni
- Unit "Enzymes and Bioconversion", National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia
| | - Dhouha Ghribi
- Unit "Enzymes and Bioconversion", National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia.
- Higher Institute of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia.
| |
Collapse
|
12
|
Bahloul N, Abid S, Hammami I, Marouen F, Feki W, Ayadi H, Kammoun S. Impact de la connaissance de la maladie sur le contrôle de l’asthme. Rev Mal Respir 2015. [DOI: 10.1016/j.rmr.2014.10.472] [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: 10/24/2022]
|
13
|
Hammami I, Gargouri I, Beriiri A, Aissa S, Bensalem H, Garrouche A, Benzarti M. Profil clinique et étiologique des hémoptysies. Rev Mal Respir 2015. [DOI: 10.1016/j.rmr.2014.10.214] [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]
|
14
|
Sellami S, Feki W, Hammami I, Ketata W, Msaed S, Kammoun S. Fistules biliothoraciques d’origine hydatique. Rev Mal Respir 2014. [DOI: 10.1016/j.rmr.2013.10.239] [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: 10/25/2022]
|
15
|
Saidi MN, Bouaziz D, Hammami I, Namsi A, Drira N, Gargouri-Bouzid R. Alterations in lignin content and phenylpropanoids pathway in date palm (Phoenix dactylifera L.) tissues affected by brittle leaf disease. Plant Sci 2013; 211:8-16. [PMID: 23987806 DOI: 10.1016/j.plantsci.2013.06.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 05/22/2013] [Accepted: 06/14/2013] [Indexed: 06/02/2023]
Abstract
Brittle leaf disease or Maladie de la Feuille Cassante (MFC) is a lethal disorder of date palm that has assumed epidemic proportions in the oases of Tunisia and Algeria. No pathogen could ever be associated with the disease, while leaflets of affected palms have been previously shown to be deficient in manganese. The work reported here aims to understand the biochemical basis of the date palm response to this disorder. Since the typical disease symptom is the leaf fragility, we have investigated lignin content in leaves and roots. Strong decrease in total lignin content was observed in affected leaves, while lignin content increased in affected roots. Histochemical analyses showed hyperlignification thicker suberin layer in roots cortical cells. The phenylpropanoids pathway was also disrupted in leaves and roots, cinnamoyl-CoA reductase and cinnamyl-alcohol dehydrogenase gene expression was affected by the disease which severely affects the cell wall integrity.
Collapse
Affiliation(s)
- Mohammed Najib Saidi
- Laboratoire des Biotechnologies Végétales Appliquées à l'Amélioration des Cultures, Ecole Nationale d'Ingénieurs de Sfax, Route Soukra Km 4, Sfax, Tunisia.
| | | | | | | | | | | |
Collapse
|
16
|
Hammami I, Siala R, Jridi M, Ktari N, Nasri M, Triki M. Partial purification and characterization of chiIO8, a novel antifungal chitinase produced by Bacillus cereus
IO8. J Appl Microbiol 2013; 115:358-66. [DOI: 10.1111/jam.12242] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2013] [Revised: 03/08/2013] [Accepted: 03/12/2013] [Indexed: 11/29/2022]
Affiliation(s)
- I. Hammami
- Unité de Recherche Protection des Plantes Cultivées et Environnement; Institut de l'Olivier; Sfax Tunisia
| | - R. Siala
- Laboratoire de Génie Enzymatique et de Microbiologie; Université de sfax Ecole Nationale d'Ingénieurs de Sfax; Sfax Tunisia
| | - M. Jridi
- Laboratoire de Génie Enzymatique et de Microbiologie; Université de sfax Ecole Nationale d'Ingénieurs de Sfax; Sfax Tunisia
| | - N. Ktari
- Laboratoire de Génie Enzymatique et de Microbiologie; Université de sfax Ecole Nationale d'Ingénieurs de Sfax; Sfax Tunisia
| | - M. Nasri
- Laboratoire de Génie Enzymatique et de Microbiologie; Université de sfax Ecole Nationale d'Ingénieurs de Sfax; Sfax Tunisia
| | - M.A. Triki
- Unité de Recherche Protection des Plantes Cultivées et Environnement; Institut de l'Olivier; Sfax Tunisia
| |
Collapse
|
17
|
Affiliation(s)
- I. Hammami
- Research Unity 01/UR/08-07; Faculty of Medicine; Department of Histology, Embryology and Cell Biology; Tunis; Tunisia
| | - M. V. El May
- Research Unity 01/UR/08-07; Faculty of Medicine; Department of Histology, Embryology and Cell Biology; Tunis; Tunisia
| |
Collapse
|
18
|
Hammami I, Chen J, Bronte V, DeCrescenzo G, Jolicoeur M. L-glutamine is a key parameter in the immunosuppression phenomenon. Biochem Biophys Res Commun 2012; 425:724-9. [PMID: 22885179 DOI: 10.1016/j.bbrc.2012.07.139] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Accepted: 07/25/2012] [Indexed: 02/07/2023]
Abstract
Suppression of tumour-specific T-cell functions by myeloid-derived suppressor cells (MDSCs) is a dominant mechanism of tumour escape. MDSCs express two enzymes, i.e. inducible nitric oxide synthase (iNOS) and arginase (ARG1), which metabolize the semi-essential amino acid L-arginine (L-Arg) whose bioavailability is crucial for T-cell proliferation and functions. Recently, we showed that glutaminolysis supports MDSC maturation process by ensuring the supply of intermediates and energy. In this work, we used an immortalized cell line derived from mouse MDSCs (MSC-1 cell line) to further investigate the role of L-glutamine (L-Gln) in the maintenance of MDSC immunosuppressive activity. Culturing MSC-1 cells in L-Gln-limited medium inhibited iNOS activity, while ARG1 was not affected. MSC-1 cells inhibited Jukat cell growth without any noticeable effect on their viability. The characterization of MSC-1 cell metabolic profile revealed that L-Gln is an important precursor of lactate production via the NADP(+)-dependent malic enzyme, which co-produces NADPH. Moreover, the TCA cycle activity was down-regulated in the absence of L-Gln and the cell bioenergetic status was deteriorated accordingly. This strongly suggests that iNOS activity, but not that of ARG1, is related to an enhanced central carbon metabolism and a high bioenergetic status. Taken altogether, our results suggest that the control of glutaminolysis fluxes may represent a valuable target for immunotherapy.
Collapse
Affiliation(s)
- Ines Hammami
- Department of Chemical Engineering, Ecole Polytechnique de Montréal, 2500 Chemin de Polytechnique, Montreal, Quebec, Canada H3T 1J4
| | | | | | | | | |
Collapse
|
19
|
Hammami I, Chen J, Murschel F, Bronte V, De Crescenzo G, Jolicoeur M. Immunosuppressive activity enhances central carbon metabolism and bioenergetics in myeloid-derived suppressor cells in vitro models. BMC Cell Biol 2012; 13:18. [PMID: 22762146 PMCID: PMC3433355 DOI: 10.1186/1471-2121-13-18] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [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: 01/13/2012] [Accepted: 07/04/2012] [Indexed: 01/10/2023] Open
Abstract
Background The tumor microenvironment contains a vast array of pro- and anti-inflammatory cytokines that alter myelopoiesis and lead to the maturation of immunosuppressive cells known as myeloid-derived suppressor cells (MDSCs). Incubating bone marrow (BM) precursors with a combination of granulocyte-macrophage colony-stimulating factor (GM-CSF) and interleukin-6 (IL-6) generated a tumor-infiltrating MDSC-like population that impaired anti-tumor specific T-cell functions. This in vitro experimental approach was used to simulate MDSC maturation, and the cellular metabolic response was then monitored. A complementary experimental model that inhibited L-arginine (L-Arg) metabolizing enzymes in MSC-1 cells, an immortalized cell line derived from primary MDSCs, was used to study the metabolic events related to immunosuppression. Results Exposure of BM cells to GM-CSF and IL-6 activated, within 24 h, L-Arg metabolizing enzymes which are responsible for the MDSCs immunosuppressive potential. This was accompanied by an increased uptake of L-glutamine (L-Gln) and glucose, the latter being metabolized by anaerobic glycolysis. The up-regulation of nutrient uptake lead to the accumulation of TCA cycle intermediates and lactate as well as the endogenous synthesis of L-Arg and the production of energy-rich nucleotides. Moreover, inhibition of L-Arg metabolism in MSC-1 cells down-regulated central carbon metabolism activity, including glycolysis, glutaminolysis and TCA cycle activity, and led to a deterioration of cell bioenergetic status. The simultaneous increase of cell specific concentrations of ATP and a decrease in ATP-to-ADP ratio in BM-derived MDSCs suggested cells were metabolically active during maturation. Moreover, AMP-activated protein kinase (AMPK) was activated during MDSC maturation in GM-CSF and IL-6–treated cultures, as revealed by the continuous increase of AMP-to-ATP ratios and the phosphorylation of AMPK. Likewise, AMPK activity was decreased in MSC-1 cells when L-Arg metabolizing enzymes were inhibited. Finally, inhibition of AMPK activity by the specific inhibitor Compound C (Comp-C) resulted in the inhibition of L-Arg metabolizing enzyme activity and abolished MDSCs immunosuppressive activity. Conclusions We anticipate that the inhibition of AMPK and the control of metabolic fluxes may be considered as a novel therapeutic target for the recovery of the immunosurveillance process in cancer-bearing hosts.
Collapse
Affiliation(s)
- Ines Hammami
- Department of Chemical Engineering, Ecole Polytechnique de Montréal, 2500 Chemin de Polytechnique, H3T-1J4, Montreal, QC, Canada
| | | | | | | | | | | |
Collapse
|
20
|
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]
|
21
|
Hammami I, Jaouadi B, Bacha AB, Rebai A, Bejar S, Nesme X, Rhouma A. Bacillus subtilis bacteriocin Bac 14B with a broad inhibitory spectrum: Purification, amino acid sequence analysis, and physicochemical characterization. BIOTECHNOL BIOPROC E 2012. [DOI: 10.1007/s12257-010-0401-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
22
|
Hammami I, Rhouma A, Jaouadi B, Rebai A, Nesme X. Optimization and biochemical characterization of a bacteriocin from a newly isolated Bacillus subtilis strain 14B for biocontrol of Agrobacterium spp. strains. Lett Appl Microbiol 2009; 48:253-60. [PMID: 19196444 DOI: 10.1111/j.1472-765x.2008.02524.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS The identification of a new compound active against Agrobacterium tumefaciens. METHODS AND RESULTS The culture conditions of a newly isolated Bacillus subtilis strain, designed 14B, were optimized, as a first step, to produce its bacteriocin (termed Bac 14B) for the biocontrol of Agrobacterium spp., the causal agents of the crown gall disease. Bac 14B was then partially purified and biochemically characterized. Bacillus subtilis 14B was observed to produce an antibacterial compound having a protinaceous nature. As estimated by sodium dodecyl sulfate-polyacrilamide gel electrophoresis (SDS-PAGE), the semi-purified bacteriocin substance was found to be a monomeric protein with a molecular weight of 21 kDa. While the latter's antimicrobial activity was completely stable during exposure to a temperature range of up to 100 degrees C for 2 h, its initial activity was totally lost at 121 degrees C for 20 min. The maximum bacteriocin production (4096 AU ml(-1)) was recorded after 96 h-incubation in an optimized Luria Bertani medium supplemented with 10 g l(-1) glucose, 15 g l(-1) K(2)HPO(4) and 5 g l(-1) MgSO(4) 7H(2)O at 30 degrees C in a shaking flask culture. Interestingly, the B. subtilis 14B culture supernatant that contained the bacteriocin under study was proved efficient in reducing both the percentage of galled plants and the number of galls in tomato. CONCLUSION The findings revealed that B. subtilis 14B and its bacteriocin are efficient in reducing the percentage of infections in plants caused by Ag. tumefaciens. SIGNIFICANCE AND IMPACT OF THE STUDY The results could be useful for the nurserymen who are particularly interested in the biocontrol of the crown gall disease.
Collapse
Affiliation(s)
- I Hammami
- Biostatistique et Signalization, Centre de Biotechnologie de Sfax, Tunisia
| | | | | | | | | |
Collapse
|