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Mohammadi T, Hosseinchi Gharehaghaj M, Alaei Novin A. Effects of apigenin and trans-ferulic acid on microscopic and oxidative stress parameters in the semen of water buffalo bulls during cryopreservation. Cryobiology 2024; 115:104868. [PMID: 38423495 DOI: 10.1016/j.cryobiol.2024.104868] [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] [Received: 10/12/2023] [Revised: 02/04/2024] [Accepted: 02/22/2024] [Indexed: 03/02/2024]
Abstract
Cryopreservation involves exposing sperm to stressful conditions that affect cell viability. The high quality of the Azerbaijani water buffalo's by-products, such as buffalo milk, makes it a species of significant importance. Our focus is on protecting its genetic resources by preserving its sperm, as their numbers will decrease in the coming years and they are at risk of extinction. This study's goal was to ascertain how apigenin (A) and trans-ferulic acid (t-FA) affected the semen quality of Azari water buffalo bulls under cryopreservation. Pooled buffalo sperm (n = 35 ejaculations) were diluted in a Tris-based diluent also containing varying amounts of apigenin (0.2, 0.4, 0.6, and 0.8 mM) and trans-ferulic acid (2.5, 5, 10 and 20 mM). Following a freeze-thaw procedure, samples were assayed for total antioxidant capacity (TAC), catalase (CAT), superoxide dismutase (SOD), malondialdehyde (MDA), glutathione activity (GSH), glutathione peroxidase (GPx), progressive motility and total motility, motility properties, plasma membrane functionality, and viability. Sixty days after insemination, the rectal examination was performed on 38 buffaloes that had undergone sexual breeding to confirm pregnancy. The results of the study show that the addition of A-0.2, A-0.4, and t-FA-10 to buffalo semen increases the percentage of intact plasma membrane, motility, and sperm viability, as well as the levels of GSH, GPx, CAT. and TAC. In addition, there is a decrease in MDA and DNA damage after cryopreservation. Furthermore, the results show that 0.4 mM apigenin significantly increases conception rates compared to the control group. The base extender of Tris supplemented with A (0.4 and 0.2 mM) and t-FA (10 mM) improves the antioxidant indices of both frozen and thawed buffalo sperm, which in turn improves post-thawing sperm quality and in vivo fertility improves buffalo sperm.
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Affiliation(s)
- T Mohammadi
- Department of Basic Science, Faculty of Veterinary Medicine, Urmia Branch, Islamic Azad University, Urmia, Iran.
| | - M Hosseinchi Gharehaghaj
- Department of Basic Science, Faculty of Veterinary Medicine, Urmia Branch, Islamic Azad University, Urmia, Iran
| | - A Alaei Novin
- Department of Pathobiology, Faculty of Veterinary Medicine, Garmsar Branch, Islamic Azad University, Iran
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Mohammadparast V, Mohammadi T, Karimi E, Mallard BL. Effects of Probiotic and Selenium Co-supplementation on Lipid Profile and Glycemia Indices: A Systematic Review and Meta-analysis of Randomized Clinical Trials. Curr Nutr Rep 2023; 12:167-180. [PMID: 36781602 PMCID: PMC9974686 DOI: 10.1007/s13668-023-00448-1] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/18/2022] [Indexed: 02/15/2023]
Abstract
PURPOSE OF REVIEW The current systematic review and meta-analysis was done to evaluate the effects of selenium and probiotic co-supplementation on lipid profile and glycemia indices of the adult population using randomized controlled clinical trials (RCTs). RECENT FINDINGS Five studies involving 282 participants with a sample size ranging from 38 to 79 were eligible to be enrolled in the current study. Co-supplementation with probiotic and selenium reduced fasting plasma glucose (WMD = -4.02 mg/dL; 95% CI: -5.87 to -2.18; P < 0.001), insulin (WMD = -2.50 mIU/mL; 95% CI: -3.11 to -1.90; P < 0.001), homeostatic model assessment for insulin resistance (WMD = -0.59; 95% CI: -0.74 to -0.43; P < 0.001), quantitative insulin sensitivity check index (WMD = 0.01; 95% CI: 0.01 to 0.02; P < 0.001), total cholesterol (WMD = -12.75 mg/dL; 95% CI: -19.44 to -6.07; P < 0.001), low-density lipoprotein cholesterol (WMD = -7.09 mg/dL; 95% CI: -13.45 to -0.73; P = 0.029), and triglyceride (WMD = -14.38 mg/dL; 95% CI: -23.13 to -5.62; P = 0.001). The findings of the current systematic review and meta-analysis suggested that co-supplementation with probiotics and selenium may benefit adults in terms of glycemia indices and lipid profile. However, due to the small number of included studies, further trials are needed to confirm our findings.
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Affiliation(s)
- Vida Mohammadparast
- School of Health Sciences, Massey University, PO Box 756, Wellington, 6021 New Zealand
| | - Tanin Mohammadi
- Department of Clinical Nutrition, School of Nutrition and Food Science, Food Security Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Elham Karimi
- Department of Clinical Nutrition, School of Nutrition and Food Science, Food Security Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Beth L. Mallard
- School of Health Sciences, Massey University, PO Box 756, Wellington, 6021 New Zealand
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Mohammadi T, Yavari T, Ghorbani S, Mohammadi B. Associations of diagnostic findings with disease activity in primary Sjӧgren's syndrome: a cluster analysis. Rev Clin Esp 2023; 223:209-215. [PMID: 36841475 DOI: 10.1016/j.rceng.2023.02.004] [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: 02/27/2023]
Abstract
OBJECTIVE The diagnosis of primary Sjӧgren's syndrome still relies upon a constellation of clinical, laboratory, imaging, and pathological findings. We aimed to evaluate the relation of the disease activity with the results of diagnostic tests for primary Sjӧgren's syndrome. METHODS A principal component with cluster analysis was performed to classify 69 patients with primary Sjӧgren's syndrome based on the results of diagnostic evaluations. RESULTS Anti-SSA autoantibody was the most represented feature on the principal components. The anti-SSA and ultrasound score were positively correlated (p=0.001). We identified two distinct clusters of low or high disease activity (p<0.001). Except for disease duration and serum beta2-microglobulin, the clusters were significantly different in salivary flow (p= 0.004), ultrasound findings (p<0.001), IgG (p= 0.001), and salivary beta2-microglobulin (p= 0.048). Also, positive findings were significantly different between the clusters in rheumatoid factor, antinuclear antibody, anti-SSA, and anti-SSB (all p≤0.013). CONCLUSION Patients with higher syndrome activity were best recognized with serological and ultrasound assessments. However, patients with lower syndrome activity had a longer disease duration, higher stimulated salivary flow rate, and a positive biopsy of minor salivary glands (56%).
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Affiliation(s)
- T Mohammadi
- University of Tehran, College of Science, School of Mathematics, Statistics, and Computer Science, Tehran, Iran
| | - T Yavari
- Tehran University of Medical Sciences, Faculty of Medicine, Shariati Hospital, Tehran, Iran
| | - S Ghorbani
- Kerman University of Medical Sciences, Shafa Hospital, Department of Otorhinolaryngology, Kerman, Iran
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Mohammadi T, Irandoost P, Roshanravan N, Khamechi SP, Milajerdi A, Larijani B, Ayati MH, Namazi N. Is there any association between fruit consumption and the risk of gestational diabetes mellitus? A systematic review and meta-analysis. Complement Ther Med 2020; 54:102445. [PMID: 33183655 DOI: 10.1016/j.ctim.2020.102445] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 04/07/2020] [Accepted: 05/13/2020] [Indexed: 01/04/2023] Open
Abstract
AIM Although a considerable number of studies have illustrated the positive effects of fresh fruits on metabolic status, the impacts of fruits on the risk of gestational diabetes mellitus (GDM) are inconsistent. In consideration of this issue, we aimed to systematically summarize the findings of cohort studies with respect to the link between fresh fruits and the risk of GDM. METHOD We selected cohort studies with English language indexed in PubMed/Medline, Scopus, Web of Science, and Embase from 2000 to 31 January 2018. To examine the link between fresh fruits and the risk of GDM development, relative risk (RR) and 95 % confidence intervals (CIs) for the highest versus the lowest consumption of fruits were pooled using a random effect model and the DerSimonian and Laird method. RESULTS Out of 2522 publications, finally 5 cohort studies were obtained. No significant association between fruit consumption and GDM incidence was found (Pooled RR: 0.95; 95 % CI: 0.84, 1.08; I2: 90.3 %, p = 0001). In women who consumed higher amount of fruits before pregnancy, the risk of GDM was 5% lower than in those who consumed lower amount of fruits (0.95; 95 %CI: 0.91, 0.99, I2: 0%, p = 0.85). No link was obtained between fruit consumption during the pregnancy and GDM onset (1.18, 95 % CI: 0.48, 2.91; I2:94.6 %, p = 0.0001). CONCLUSION In women who consumed greater fruits before pregnancy, the risk for GDM was 5 % lower than those consumed lower amounts of fruits, while there was no link between fruit consumption throughout the pregnancy and GDM onset. However, due to limited studies and considerable heterogeneity, the findings must be interpreted with great caution.
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Affiliation(s)
- Tanin Mohammadi
- Department of Clinical Nutrition, School of Nutrition and Food Sciences, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Pardis Irandoost
- Department of Nutrition, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
| | - Neda Roshanravan
- Cardiovascular Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | | | - Alireza Milajerdi
- Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences, Tehran, Iran
| | - Bagher Larijani
- Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Hossein Ayati
- School of Traditional Medicine, Tehran University of Medical Sciences, Tehran, Iran; Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran.
| | - Nazli Namazi
- Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran; Diabetes Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran.
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Chavannes M, Wong C, Mohammadi T, Zhang W, Rosenfeld G. A224 COST-EFFECTIVENESS ANALYSIS OF FECAL CALPROTECTIN USED IN PRIMARY CARE IN THE DIAGNOSIS OF INFLAMMATORY BOWEL DISEASE. J Can Assoc Gastroenterol 2018. [DOI: 10.1093/jcag/gwy009.224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- M Chavannes
- University of British Columbia, Vancouver, BC, Canada
| | - C Wong
- CHEOS, Vancouver, BC, Canada
| | | | - W Zhang
- CHEOS, Vancouver, BC, Canada
| | - G Rosenfeld
- University of British Columbia, Vancouver, BC, Canada
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Mohammadi T, Paknahad Z. Adiponectin Concentration in Gestational Diabetic Women: a Case-Control Study. Clin Nutr Res 2017; 6:267-276. [PMID: 29124047 PMCID: PMC5665748 DOI: 10.7762/cnr.2017.6.4.267] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [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: 06/19/2017] [Revised: 09/16/2017] [Accepted: 09/26/2017] [Indexed: 12/15/2022] Open
Abstract
Gestational diabetes mellitus (GDM) is an impaired fasting glucose condition during pregnancy. Adiponectin is a polypeptide hormone that is extensively released by adipocytes which regulates energy homeostasis and carbohydrate and lipid metabolism. In addition, adiponectin has antidiabetic and anti-inflammatory properties. The aim of our research was to study about the relationship of adiponectin levels to GDM and glucose intolerance. We selected 25 GDM women and 35 healthy pregnant subjects (18–46 years) who were screened between 24 and 28 weeks of gestation based on the result of oral glucose tolerance test (OGTT). We designed a case-control study and measured the concentrations of serum adiponectin and compared the concentrations between the groups. Serum adiponectin concentration was measured using enzyme-linked immunosorbent assay (ELISA). Sociodemographic data were collected by personal interview. Serum adiponectin concentrations were significantly lower in the subjects with GDM (5.10 ± 2.15 ng/mL vs. 7.86 ± 3.52 ng/mL, p = 0.001) than in healthy pregnant subjects. The mean concentration of fasting blood glucose was considerably lower in control subjects (86.9 ± 9.0 mg/dL vs. 175.9 ± 20.1 mg/dL, p < 0.001) in comparison to GDM subjects. Our findings showed that serum concentrations of adiponectin were significantly lower in gestational diabetic women and this may help to predict the risk of GDM.
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Affiliation(s)
- Tanin Mohammadi
- Department of Clinical Nutrition, School of Nutrition and Food Sciences, Isfahan University of Medical Sciences, Isfahan 81746-73461, Iran
| | - Zamzam Paknahad
- Department of Clinical Nutrition, School of Nutrition and Food Sciences, Isfahan University of Medical Sciences, Isfahan 81746-73461, Iran
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Jomekian A, Behbahani R, Mohammadi T, Kargari A. Utilization of Pebax 1657 as structure directing agent in fabrication of ultra-porous ZIF-8. J SOLID STATE CHEM 2016. [DOI: 10.1016/j.jssc.2016.01.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [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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Shokrkar H, Salahi A, Kasiri N, Mohammadi T. Prediction of permeation flux decline during MF of oily wastewater using genetic programming. Chem Eng Res Des 2012. [DOI: 10.1016/j.cherd.2011.10.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Abbasi M, Reza Sebzari M, Mohammadi T. Enhancement of Oily Wastewater Treatment by Ceramic Microfiltration Membranes using Powder Activated Carbon. Chem Eng Technol 2011. [DOI: 10.1002/ceat.201100108] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Shokrkar H, Salahi A, Kasiri N, Mohammadi T. Mullite ceramic membranes for industrial oily wastewater treatment: experimental and neural network modeling. Water Sci Technol 2011; 64:670-676. [PMID: 22097046 DOI: 10.2166/wst.2011.655] [Citation(s) in RCA: 4] [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: 05/31/2023]
Abstract
In this paper, results of an experimental and modeling of separation of oil from industrial oily wastewaters (desalter unit effluent of Seraje, Ghom gas wells, Iran) with mullite ceramic membranes are presented. Mullite microfiltration symmetric membranes were synthesized from kaolin clay and alpha-alumina powder. The results show that the mullite ceramic membrane has a high total organic carbon and chemical oxygen demand rejection (94 and 89%, respectively), a low fouling resistance (30%) and a high final permeation flux (75 L/m2 h). Also, an artificial neural network, a predictive tool for tracking the inputs and outputs of a non-linear problem, is used to model the permeation flux decline during microfiltration of oily wastewater. The aim was to predict the permeation flux as a function of feed temperature, trans-membrane pressure, cross-flow velocity, oil concentration and filtration time, using a feed-forward neural network. Finally the structure of hidden layers and nodes in each layer with minimum error were reported leading to a 4-15 structure which demonstrated good agreement with the experimental measurements with an average error of less than 2%.
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Affiliation(s)
- H Shokrkar
- Computer Aided Process Engineering (CAPE) Lab, Department of Chemical Engineering, Iran University of Science and Technology (lUST), Narmak, Tehran, Iran
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Abstract
In this research, results of an experimental investigation on separation of oil from a real oily wastewater using an ultrafiltration (UF) polymeric membrane are presented. In order to enhance the performance of UF in API separator effluent treatment and to get more permeation flux (PF), effects of operating factors on the yield of PF were studied. Five factors at four levels were investigated: trans-membrane pressure (TMP), temperature (T), cross flow velocity (CFV), pH and salt concentration (SC). Taguchi method (L(16) orthogonal array (OA)) was used. Analysis of variance (ANOVA) was applied to calculate sum of square, variance, error variance and contribution percentage of each factor on response. The optimal levels thus determined for the four influential factors were: TMP, 3 bar; T, 40˚C; CFV, 1.0 m/s; SC, 25 g/L and pH, 8. The results showed that CFV and SC are the most and the least effective factors on PF, respectively. Increasing CFV, TMP, T and pH caused the better performance of UF membrane process due to enhancement of driving force and fouling residence. Also, effects of oil concentration (OC) in the wastewater on PF and total organic carbon (TOC) rejection were investigated. Finally, the highest TOC rejection was found to be 85%.
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Affiliation(s)
- A Salahi
- Research Centre for Membrane Separation Processes, Iran University of Science and Technology, Narmak, Tehran, Iran.
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Abstract
Investigations were carried out for purification of oily wastewater by a combined of ultrafiltration/reverse osmosis (UF/RO) processes. Laboratory-scale UF using polysulfone (PS) and polyacrylonitrile (PAN) membranes were employed with typical oily wastewater collected from API unit of Tehran refinery. The PAN membrane showed higher rejection, more permeation flux and less fouling resistance than the PS membrane. Both membranes produced permeate with oil and grease contents generally less than 5 ppm. Rejection of chemical oxygen demand (COD) and biological oxygen demand (BOD5) were found to be 65% for UF treatment. In this work, Hermia's models were used to investigate the fouling mechanism involved in UF of the oily wastewater. The results showed that the best fit to experimental data corresponds to the cake layer formation model followed by the intermediate blocking model for both the UF membranes. For further treatment of the UF permeates, RO was applied using a thin film composite polyamide membrane. The rejection of COD, BOD5 and total dissolved solid (TDS) after UF/RO treatment increased up to 98%, 98% and 95%, respectively. The results showed that the final permeate has very high quality and even better than that is currently introduced to the cooling towers in Tehran refinery.
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Affiliation(s)
- A Salahi
- Research Centre for Membrane Separation processes, Faculty of Chemical Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran.
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Amirilargani M, Saljoughi E, Mohammadi T, Moghbeli M. Effects of coagulation bath temperature and polyvinylpyrrolidone content on flat sheet asymmetric polyethersulfone membranes. POLYM ENG SCI 2009. [DOI: 10.1002/pen.21603] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Bakhtiari O, Mohammadi T. L-Lysine Monohydrochloride Syrup Concentration using a Membrane Hybrid Process of Ultrafiltration and Vacuum Membrane Distillation. Chem Eng Technol 2008. [DOI: 10.1002/ceat.200800285] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Affiliation(s)
- T. Mohammadi
- Research Laboratory for Separation Processes, Chemical Engineering Department, Iran University of Science and Technology, Narmak, Tehran, Iran, Chem. & Petrochemical Division, Research Institute of Petroleum Industry, Tehran, Iran, and Gas Division, Research Institute of Petroleum Industry, Tehran, Iran
| | - M. Tavakol Moghadam
- Research Laboratory for Separation Processes, Chemical Engineering Department, Iran University of Science and Technology, Narmak, Tehran, Iran, Chem. & Petrochemical Division, Research Institute of Petroleum Industry, Tehran, Iran, and Gas Division, Research Institute of Petroleum Industry, Tehran, Iran
| | - M. Saeidi
- Research Laboratory for Separation Processes, Chemical Engineering Department, Iran University of Science and Technology, Narmak, Tehran, Iran, Chem. & Petrochemical Division, Research Institute of Petroleum Industry, Tehran, Iran, and Gas Division, Research Institute of Petroleum Industry, Tehran, Iran
| | - M. Mahdyarfar
- Research Laboratory for Separation Processes, Chemical Engineering Department, Iran University of Science and Technology, Narmak, Tehran, Iran, Chem. & Petrochemical Division, Research Institute of Petroleum Industry, Tehran, Iran, and Gas Division, Research Institute of Petroleum Industry, Tehran, Iran
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Mirfendereski S, Mazaheri T, Sadrzadeh M, Mohammadi T. CO2 and CH4 permeation through T-type zeolite membranes: Effect of synthesis parameters and feed pressure. Sep Purif Technol 2008. [DOI: 10.1016/j.seppur.2007.11.007] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [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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Peer M, Mahdyarfar M, Mohammadi T. Evaluation of a mathematical model using experimental data and artificial neural network for prediction of gas separation. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/s1003-9953(08)60040-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Mohammadi T, Pietersz RNI, Scholtalbers LAH, Vandenbroucke-Grauls CMJE, Savelkoul PHM, Reesink HW. Optimal sampling time after preparation of platelet concentrates for detection of bacterial contamination by quantitative real-time polymerase chain reaction. Vox Sang 2005; 89:208-14. [PMID: 16262753 DOI: 10.1111/j.1423-0410.2005.00707.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [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: 11/30/2022]
Abstract
BACKGROUND AND OBJECTIVES A universal quantitative real-time polymerase chain reaction (PCR), based on bacterial 16S rDNA, to detect bacterial contamination of platelet concentrates (PCs), was developed previously and compared with automated culturing. In the present study, this real-time PCR method was evaluated to determine the optimal sampling time for screening of bacterial contamination in PCs. MATERIALS AND METHODS Routinely prepared PCs were spiked with suspensions of Escherichia coli, Bacillus cereus, Staphylococcus epidermidis, Pseudomonas aeruginosa and Propionibacterium acnes to 1, 10 and 100 colony-forming units (CFU)/ml and stored at room temperature for 7 days. The presence of bacteria in these PCs was monitored by quantitative real-time PCR. As a reference method (additional control), BacT/Alert automated culturing was used. For PCR, 1-ml aliquots were drawn from all (spiked) PCs on days 0, 1, 2, 3, 6 and 7 of storage. As a control, triplicate samples (10 ml) were inoculated into aerobic and anaerobic BacT/Alert culture bottles immediately after spiking (day 0) and after storage for 1, 2, 3, 6 or 7 days. RESULTS With quantitative real-time PCR, all bacterial species tested were reproducibly detected on day 1 after spiking at original concentrations of 10 and 100 CFU/ml. Bacteria were also detected on day 1 from PCs spiked with an initial concentration of 1 CFU/ml, except for E. coli, which was detected in only one of the three samples and P. aeruginosa, for which analysis was not performed on day 1. With the reference method, bacteria were detected in culture bottles (inoculated on day 0) within a mean time of 20.1 h, with the exception of P. acnes which was detected at a mean time of 102.3 and 49.3 h (for original spiking concentrations of 10 and 100 CFU/ml respectively). CONCLUSIONS PCR enables the rapid detection of low initial numbers of bacteria in PCs. For reliable detection, our results support that sampling of PCs for real-time PCR screening should not be carried out earlier than 1 day after preparation (48 h after blood collection). Importantly, the real-time PCR approach has the potential to be used before the release of PCs from the blood centre or shortly before they are transfused in the hospital.
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Affiliation(s)
- T Mohammadi
- Sanquin Blood Bank North West Region, Amsterdam, Netherlands
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Mohammadi T, Reesink HW, Pietersz RNI, Vandenbroucke-Grauls CMJE, Savelkoul PHM. Amplified-fragment length polymorphism analysis of Propionibacterium isolates implicated in contamination of blood products. Br J Haematol 2005; 131:403-9. [PMID: 16225662 DOI: 10.1111/j.1365-2141.2005.05771.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [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: 11/24/2022]
Abstract
Propionibacterium acnes is implicated in most cases of bacterial contamination of platelet concentrates (PCs). To determine the source of contamination, amplified-fragment length polymorphism (AFLP) analysis was applied. This DNA fingerprinting technique was used to study the molecular relationship of 44 isolates derived from 22 PCs and 22 corresponding red blood cells concentrates (RBCs) from the same whole blood donations. The AFLP results together with sequencing analysis of the 1,200 bp of the 16S ribosomal RNA gene revealed the existence of three main groups: two groups (groups 2 and 3) (55%) consisted of isolates that did not originate from skin flora and another group (group 1) (45%) comprised bacteria belonging to the skin flora. This latter group showed complete homology with reference strains of P. acnes. Therefore these isolates can be considered as P. acnes strains. In contrast, contaminants from groups 2 and 3 were shown to be molecularly unrelated to the P. acnes found on the skin surface. The AFLP is reproducible and gave invaluable information about the nature of Propionibacteria contaminating PCs. To gain more insights into the source of contamination, this technique could be exploited in further studies to determine the molecular relationship of different bacteria commonly found in blood products.
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Affiliation(s)
- T Mohammadi
- Sanquin Blood Bank North West Region, Amsterdam, The Netherlands
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Asero R, Mistrello G, Roncarolo D, de Vries SC, Gautier MF, Ciurana CL, Verbeek E, Mohammadi T, Knul-Brettlova V, Akkerdaas JH, Bulder I, Aalberse RC, van Ree R. Lipid transfer protein: a pan-allergen in plant-derived foods that is highly resistant to pepsin digestion. Int Arch Allergy Immunol 2001; 124:67-9. [PMID: 11306929 DOI: 10.1159/000053671] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.9] [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: 11/19/2022] Open
Abstract
BACKGROUND Lipid transfer proteins (LTPs) are stable and highly conserved proteins of around 10 kD. They have recently been identified as allergens in fruits of the Rosaceae family. OBJECTIVE The aim of this study was to investigate whether the highly conserved structure of LTPs justifies a designation as a true pan-allergen, and to study the role of protein stability in allergenicity. METHODS Thirty-eight patients with a positive skin prick test to Rosaceae fruit extracts were characterized by interviews and skin prick tests. To investigate IgE cross-reactivity between Rosaceae and non-Rosaceae LTPs, RAST and RAST inhibition as well as ELISA and ELISA inhibition were performed, using whole food extracts and purified natural and recombinant LTPs. To address the role of protein stability in the allergenicity of LTP, fruit extracts and LTPs were digested with pepsin. RESULTS IgE antibodies to Rosaceae LTPs cross-reacted with a broad range of non-Rosaceae vegetable foods. Inhibition studies with purified natural and recombinant LTPs confirmed the role of LTP in this cross-reactivity. Many of the patients with this type of cross-reactive IgE antibodies had a clinical food allergy. In contrast to the typical birch Rosaceae cross-reactive patients, the oral allergy syndrome was frequently accompanied by more severe and systemic reactions. IgE reactivity to LTP was shown to be resistant to pepsin treatment of the allergen. CONCLUSION LTP is a true pan-allergen with a degree of cross-reactivity comparable to profilin. Due to its extreme resistance to pepsin digestion, LTP is a potentially severe food allergen.
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Affiliation(s)
- R Asero
- Ambulatorio di Allergologia, Ospedale Caduti Bollatesi, Bollate, Italy
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Asero R, Mistrello G, Roncarolo D, de Vries SC, Gautier MF, Ciurana CL, Verbeek E, Mohammadi T, Knul-Brettlova V, Akkerdaas JH, Bulder I, Aalberse RC, van Ree R. Lipid transfer protein: a pan-allergen in plant-derived foods that is highly resistant to pepsin digestion. Int Arch Allergy Immunol 2000; 122:20-32. [PMID: 10859466 DOI: 10.1159/000024355] [Citation(s) in RCA: 223] [Impact Index Per Article: 9.3] [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: 11/19/2022] Open
Abstract
BACKGROUND Lipid transfer proteins (LTPs) are small molecules of approximately 10 kD that demonstrate high stability. They have recently been identified as allergens in the Rosaceae subfamilies of the Prunoideae (peach, apricot, plum) and of the Pomoideae (apple). They belong to a family of structurally highly conserved proteins that are also present in non-Rosaceae vegetable foods. OBJECTIVE The aim of this study was to investigate the cross-reactivity to non-Rosaceae LTPs, and to study the role of protein stability in allergenicity. METHODS Thirty-eight patients with a positive SPT to Rosaceae fruit extracts enriched for LTP were characterized by interview and SPT. To investigate IgE cross-reactivity between Rosaceae and non-Rosaceae LTPs, RAST and RAST inhibition as well as ELISA and ELISA inhibition were performed, using whole food extracts and purified LTPs. Both purified natural LTPs (peach, carrot and broccoli) and Pichia pastoris recombinant LTPs (carrot and wheat) were included. Pepsin digestion was used to address the role of stability in the allergenicity of LTPs. RESULTS IgE antibodies to Rosaceae LTPs reacted to a broad range of vegetable foods, including Gramineae (cereals), Leguminosae (peanut), Juglandaceae (walnut), Anacardiaceae (pistachio), Brassicaceae (broccoli), Umbelliferae (carrot, celery), Solanaceae (tomato), Cucurbitaceae (melon), and Actinidiaceae (kiwi). Binding and inhibition studies with purified natural and recombinant LTPs confirmed their role in this cross-reactivity. Many of these cross-reactivities were accompanied by clinical food allergy, frequently including systemic reactions. Antibody binding to LTP was shown to be resistant to pepsin treatment of whole extract or purified LTP. CONCLUSION LTP is a pan-allergen with a degree of cross-reactivity comparable to profilin. Due to its extreme resistance to pepsin digestion, LTP is a potentially severe food allergen.
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Affiliation(s)
- R Asero
- Ambulatorio di Allergologia, Ospedale Caduti Bollatesi, Bollate, Italy
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