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Alzayer M, Alkhulaifi MM, Alyami A, Aldosary M, Alageel A, Garaween G, Shibl A, Al-Hamad AM, Doumith M. Genomic insights into the diversity, virulence, and antimicrobial resistance of group B Streptococcus clinical isolates from Saudi Arabia. Front Cell Infect Microbiol 2024; 14:1377993. [PMID: 38711928 PMCID: PMC11070470 DOI: 10.3389/fcimb.2024.1377993] [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] [Received: 01/28/2024] [Accepted: 04/04/2024] [Indexed: 05/08/2024] Open
Abstract
Introduction Detailed assessment of the population structure of group B Streptococcus (GBS) among adults is still lacking in Saudi Arabia. Here we characterized a representative collection of isolates from colonized and infected adults. Methods GBS isolates (n=89) were sequenced by Illumina and screened for virulence and antimicrobial resistance determinants. Genetic diversity was assessed by single nucleotide polymorphisms and core-genome MLST analyses. Results Genome sequences revealed 28 sequence types (STs) and nine distinct serotypes, including uncommon serotypes VII and VIII. Majority of these STs (n=76) belonged to the human-associated clonal complexes (CCs) CC1 (33.71%), CC19 (25.84%), CC17 (11.24%), CC10/CC12 (7.87%), and CC452 (6.74%). Major CCs exhibited intra-lineage serotype diversity, except for the hypervirulent CC17, which exclusively expressed serotype III. Virulence profiling revealed that nearly all isolates (94.38%) carried at least one of the four alpha family protein genes (i.e., alphaC, alp1, alp2/3, and rib), and 92.13% expressed one of the two serine-rich repeat surface proteins Srr1 or Srr2. In addition, most isolates harbored the pilus island (PI)-2a alone (15.73%) or in combination with PI-1 (62.92%), and those carrying PI-2b alone (10.11%) belonged to CC17. Phylogenetic analysis grouped the sequenced isolates according to CCs and further subdivided them along with their serotypes. Overall, isolates across all CC1 phylogenetic clusters expressed Srr1 and carried the PI-1 and PI-2a loci, but differed in genes encoding the alpha-like proteins. CC19 clusters were dominated by the III/rib/srr1/PI-1+PI-2a (43.48%, 10/23) and V/alp1/srr1/PI-1+PI-2a (34.78%, 8/23) lineages, whereas most CC17 isolates (90%, 9/10) had the same III/rib/srr2/P1-2b genetic background. Interestingly, genes encoding the CC17-specific adhesins HvgA and Srr2 were detected in phylogenetically distant isolates belonging to ST1212, suggesting that other highly virulent strains might be circulating within the species. Resistance to macrolides and/or lincosamides across all major CCs (n=48) was associated with the acquisition of erm(B) (62.5%, 30/48), erm(A) (27.1%, 13/48), lsa(C) (8.3%, 4/48), and mef(A) (2.1%, 1/48) genes, whereas resistance to tetracycline was mainly mediated by presence of tet(M) (64.18%, 43/67) and tet(O) (20.9%, 14/67) alone or in combination (13.43%, 9/67). Discussion These findings underscore the necessity for more rigorous characterization of GBS isolates causing infections.
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Affiliation(s)
- Maha Alzayer
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia
- Department of Microbiology and Immunology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | - Manal M. Alkhulaifi
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Ahmed Alyami
- Pathology and Clinical Laboratory, Medicine Administration, King Fahad Medical City, Riyadh, Saudi Arabia
| | - Mohammed Aldosary
- Pathology and Clinical Laboratory, Medicine Administration, King Fahad Medical City, Riyadh, Saudi Arabia
| | - Abdulaziz Alageel
- Pathology and Clinical Laboratory, Medicine Administration, King Fahad Medical City, Riyadh, Saudi Arabia
| | - Ghada Garaween
- Department of Microbiology and Immunology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | - Atef Shibl
- Department of Microbiology and Immunology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | - Arif M. Al-Hamad
- Division of Clinical Microbiology, Pathology and Laboratory Medicine, Qatif Central Hospital, Qatif, Saudi Arabia
| | - Michel Doumith
- Infectious Diseases Research Department, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia
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Alzayer M, Alkhulaifi MM, Alyami A, Aldosary M, Alageel A, Garaween G, Shibl A, Al-Hamad AM, Doumith M. Corrigendum to "Molecular typing and antimicrobial resistance of group B Streptococcus clinical isolates in Saudi Arabia" [Journal of Global Antimicrobial Resistance 35 (2023) 244-251]. J Glob Antimicrob Resist 2024; 36:493. [PMID: 38521550 DOI: 10.1016/j.jgar.2024.01.002] [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] [Subscribe] [Scholar Register] [Indexed: 03/25/2024] Open
Affiliation(s)
- Maha Alzayer
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia; Department of Microbiology and Immunology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia.
| | - Manal M Alkhulaifi
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Ahmed Alyami
- Pathology and Clinical Laboratory, Medicine Administration, King Fahad Medical City, Riyadh, Saudi Arabia
| | - Mohammed Aldosary
- Pathology and Clinical Laboratory, Medicine Administration, King Fahad Medical City, Riyadh, Saudi Arabia
| | - Abdulaziz Alageel
- Pathology and Clinical Laboratory, Medicine Administration, King Fahad Medical City, Riyadh, Saudi Arabia
| | - Ghada Garaween
- Department of Microbiology and Immunology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | - Atef Shibl
- Department of Microbiology and Immunology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | - Arif M Al-Hamad
- Division of Clinical Microbiology, Pathology and Laboratory Medicine, Qatif Central Hospital, Qatif, Saudi Arabia
| | - Michel Doumith
- Infectious Diseases Research Department, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia
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Alyami A, AlJurayyan A, Alosaimi B, Alkadi H, Alkhulaifi F, Al-Jurayb H, Osman A, Christmas S, Alomar S, Al-Bayati Z. The correlation between soluble human leukocyte antigen (sHLA-G) levels and +3010 polymorphism. Int J Immunogenet 2024; 51:39-46. [PMID: 38087909 DOI: 10.1111/iji.12648] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 11/16/2023] [Accepted: 12/01/2023] [Indexed: 01/10/2024]
Abstract
Human leukocyte antigen-G (HLA-G) is classified as non-classical HLA, located in the short arm of chromosome 6 and composed of seven introns and eight exons. The HLA-G gene has a lower frequency polymorphism in the coding area and higher variability at the regulatory 5'- and 3'-untranslated regions linked to HLA-G microRNA regulation. HLA-G molecule is known to have an immunomodulatory and tolerogenic features role. In 199 Saudi individuals, we examined the association between plasma soluble HLA-G (sHLA-G) levels and eight polymorphic different sites, including 14 bp ins/del/+3003T-C/+3010C-G/+3027C-A/+3035C-T/+3142C-G/+3187A-G/+3196C-G single nucleotide polymorphisms (SNPs) in exon 8 in the HLA-G gene. Our results revealed higher frequency for rs17179101C (97%), rs1707T (92%) and rs9380142A (73%) alleles. Greater frequencies for the tested genotypes were observed in 3027C/C (rs17179101) (93%), 14 bp (rs1704) ins/del (92%), +3003T/T (rs1707) (85%) and +3035C/T (rs17179108) (79%) SNP genotypes. Moreover, we observed a significant association of sHLA-G with +3010G/C (rs1710) SNP. In conclusion, we showed a significant association between 3010G/C (rs1710) SNP and the sHLA-G level among our sample for Saudi populations. Our findings demonstrated that specific SNP within the HLA-G gene is linked to sHLA-G molecule secretion, suggesting sHLA-G levels may be regulated genetically.
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Affiliation(s)
- Ahmed Alyami
- Pathology and Clinical Laboratory Medicine Administration, King Fahad Medical City, Riyadh Second Health Cluster, Riyadh, Saudi Arabia
| | - Abdullah AlJurayyan
- Pathology and Clinical Laboratory Medicine Administration, King Fahad Medical City, Riyadh Second Health Cluster, Riyadh, Saudi Arabia
| | - Bandar Alosaimi
- Research Center, King Fahad Medical City Riyadh Second Health Cluster, Riyadh, Saudi Arabia
| | - Haitham Alkadi
- Research Center, King Fahad Medical City Riyadh Second Health Cluster, Riyadh, Saudi Arabia
| | - Fadwa Alkhulaifi
- College of Science, Imam Abdulrahman bin Faisal University, Dammam, Saudi Arabia
| | - Haya Al-Jurayb
- Pathology and Clinical Laboratory Medicine Administration, King Fahad Medical City, Riyadh Second Health Cluster, Riyadh, Saudi Arabia
| | - Awad Osman
- Pathology and Clinical Laboratory Medicine Administration, King Fahad Medical City, Riyadh Second Health Cluster, Riyadh, Saudi Arabia
| | - Steve Christmas
- Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, UK
| | - Suliman Alomar
- College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Zaid Al-Bayati
- Department of Genetic Study, Azadi Teaching Hospital, Kirkuk, Iraq
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Alzayer M, Alkhulaifi MM, Alyami A, Aldosary M, Alageel A, Garaween G, Shibl A, Al-Hamad AM, Doumith M. Molecular typing and antimicrobial resistance of group B Streptococcus clinical isolates in Saudi Arabia. J Glob Antimicrob Resist 2023; 35:244-251. [PMID: 37844802 DOI: 10.1016/j.jgar.2023.10.007] [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: 09/14/2023] [Accepted: 10/06/2023] [Indexed: 10/18/2023] Open
Abstract
OBJECTIVES Group B Streptococcus (GBS) has emerged as an important cause of severe infections in adults. However, limited data are available regarding the epidemiology of GBS in Saudi Arabia. METHODS Isolates were collected over a period of eight months from colonized (n = 104) and infected adults (n = 95). Serotypes and virulence determinants were detected by polymerase chain reactions (PCRs). Genetic relatedness was assessed using Multiple Locus Variable Number Tandem Repeat Analysis (MLVA). Antimicrobial susceptibilities were determined by disk diffusion. RESULTS Serotypes III and V (25% each) were the most prevalent, followed by serotypes II (16.18%), Ia (13.24%), VI (9.31%), and Ib (8.82%), while five isolates remained non-typeable (2.45%). Hypervirulent serotype III/CC17 clone (n = 21) accounted for 41.18% of the serotype III isolates. Most isolates (53.92%) harboured pilus island (PI) 1 and 2a types, while PI-2b was predominantly detected in the hypervirulent clone. Isolates were variably resistant to tetracycline (76.47%), erythromycin (36.76%), clindamycin (25.49%), and levofloxacin (6.37%), but remained susceptible to penicillin. Macrolide resistant isolates exhibited constitutive (55.42%) and inducible macrolide-lincosamide-streptogramin B resistance phenotypes (33.74%), while a few had L (9.64%) or M (1.2%) phenotypes. MLVA patterns of dominant serotypes III and V revealed 40 different types divided into 12 clusters and 28 singletons. Interestingly, macrolide resistance was significantly associated with two major MLVA types. CONCLUSIONS GBS isolates belonged predominantly to serotypes III and V, but there were no clear associations between serotypes and patient groups. The studied isolates exhibited high levels of resistance to erythromycin and clindamycin that need further surveillance.
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Affiliation(s)
- Maha Alzayer
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia; Department of Microbiology and Immunology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia.
| | - Manal M Alkhulaifi
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Ahmed Alyami
- Pathology and Clinical Laboratory, Medicine Administration, King Fahad Medical City, Riyadh, Saudi Arabia
| | - Mohammed Aldosary
- Pathology and Clinical Laboratory, Medicine Administration, King Fahad Medical City, Riyadh, Saudi Arabia
| | - Abdulaziz Alageel
- Pathology and Clinical Laboratory, Medicine Administration, King Fahad Medical City, Riyadh, Saudi Arabia
| | - Ghada Garaween
- Department of Microbiology and Immunology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | - Atef Shibl
- Department of Microbiology and Immunology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | - Arif M Al-Hamad
- Division of Clinical Microbiology, Pathology and Laboratory Medicine, Qatif Central Hospital, Qatif, Saudi Arabia
| | - Michel Doumith
- Infectious Diseases Research Department, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia
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Rezkallah A, Alyami A, Kodjikian L, Mathis T, Denis P. [Laser YAG iris cystotomy]. J Fr Ophtalmol 2023; 46:680-682. [PMID: 37087323 DOI: 10.1016/j.jfo.2023.01.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 12/27/2022] [Accepted: 01/02/2023] [Indexed: 04/24/2023]
Affiliation(s)
- A Rezkallah
- Service d'ophtalmologie, hôpital de la Croix-Rousse, hospices civils de Lyon, 103, Grande-rue de la Croix-Rousse, 69317 Lyon cedex 4, France; UMR-CNRS 5510 Matéis, université de médicine Lyon 1, Lyon, France; Inserm U1208, Stem Cell and Brain Research Institue, université de médecine Lyon 1, Lyon, France.
| | - A Alyami
- Service d'ophtalmologie, hôpital de la Croix-Rousse, hospices civils de Lyon, 103, Grande-rue de la Croix-Rousse, 69317 Lyon cedex 4, France
| | - L Kodjikian
- Service d'ophtalmologie, hôpital de la Croix-Rousse, hospices civils de Lyon, 103, Grande-rue de la Croix-Rousse, 69317 Lyon cedex 4, France; UMR-CNRS 5510 Matéis, université de médicine Lyon 1, Lyon, France
| | - T Mathis
- Service d'ophtalmologie, hôpital de la Croix-Rousse, hospices civils de Lyon, 103, Grande-rue de la Croix-Rousse, 69317 Lyon cedex 4, France; UMR-CNRS 5510 Matéis, université de médicine Lyon 1, Lyon, France
| | - P Denis
- Service d'ophtalmologie, hôpital de la Croix-Rousse, hospices civils de Lyon, 103, Grande-rue de la Croix-Rousse, 69317 Lyon cedex 4, France
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Shubayr N, Faraj H, Hurbush M, Khormi M, Alyami A, Majrashi N, Alomairy N. Assessment of job satisfaction, lifestyle behaviors, and occupational burnout symptoms during the COVID-19 pandemic among radiologic technologists in Saudi Arabia. Radiography (Lond) 2022; 28:1087-1092. [PMID: 36030598 PMCID: PMC9414262 DOI: 10.1016/j.radi.2022.07.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [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: 05/19/2022] [Revised: 07/27/2022] [Accepted: 07/29/2022] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Radiologic technologists (RTs) are among the healthcare staff negatively impacted by job dissatisfaction, occupational stress, and unhealthy lifestyle behaviors, especially during the COVID-19 pandemic. The aim of this study was to assess job satisfaction, lifestyle behaviors, occupational burnout symptoms, and associated factors among RTs in Saudi Arabia. METHODS A survey study was conducted from January 2021 to February 2022 using a self-administered questionnaire. The questionnaire gathered socio-demographic information, answers to the Minnesota Satisfaction Questionnaire, lifestyle behaviors, and frequency of occupational burnout symptoms. Data were analyzed to obtain descriptive and inferential statistics. RESULTS A total of 261 RTs completed the survey. Participants were predominantly male and most were working in public hospitals. The overall mean score for job satisfaction was 3.77 (of 5), indicating moderate job satisfaction, with two items showing low satisfaction- compensation (3.33) and advancement (3.28). The overall mean score for lifestyle behaviors was 2.00 (of 3), indicating moderate lifestyle behaviors, with the lowest scores reported in sleep quality (1.92), healthy diet (1.85), and relaxing and unwinding (1.86). For burnout symptoms, the overall mean score was 2.30, indicating moderate burnout level, with the highest score reported in experiencing physical symptoms (2.72). There were significant relationships between job satisfaction, lifestyle behaviors and burnout symptoms. A positive and moderate relationship, r = 0.53 (p < 0.05), was found between job satisfaction and healthy lifestyle behaviors. The burnout relationships with job satisfaction, r = -0.615 (p < 0.05), and healthy lifestyle behaviors, r = -0.524 (p < 0.05), were negative and moderate relationships CONCLUSION: The interrelationships between job satisfaction, lifestyle behaviors, and occupational burnout symptoms suggest that improving lifestyle behaviors and managing burnout symptoms could contribute to higher job satisfaction. IMPLICATIONS FOR PRACTICE Policymakers should focus their efforts in the workplace health promotion programs to play essential roles in promoting healthy lifestyle behaviors and occupational stress management, as well as, improvements of RTs career advancement and compensation.
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Affiliation(s)
- N. Shubayr
- Department of Diagnostic Radiography Technology, College of Applied Medical Sciences, Jazan University, Jazan, Saudi Arabia,Medical Research Centre, Jazan University, Jazan, Saudi Arabia,Corresponding author. Diagnostic Radiography Technology, Faculty of Applied Medical Sciences, Jazan University, Jazan, 45142, Saudi Arabia
| | - H. Faraj
- Department of Diagnostic Radiography Technology, College of Applied Medical Sciences, Jazan University, Jazan, Saudi Arabia
| | - M. Hurbush
- Department of Diagnostic Radiography Technology, College of Applied Medical Sciences, Jazan University, Jazan, Saudi Arabia
| | - M. Khormi
- Department of Diagnostic Radiography Technology, College of Applied Medical Sciences, Jazan University, Jazan, Saudi Arabia
| | - A. Alyami
- Department of Diagnostic Radiography Technology, College of Applied Medical Sciences, Jazan University, Jazan, Saudi Arabia
| | - N. Majrashi
- Department of Diagnostic Radiography Technology, College of Applied Medical Sciences, Jazan University, Jazan, Saudi Arabia
| | - N. Alomairy
- Department of Diagnostic Radiography Technology, College of Applied Medical Sciences, Jazan University, Jazan, Saudi Arabia
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Alyami A, Saviello D, McAuliffe MAP, Mirabile A, Lewis L, Iacopino D. Metal nanoinks as chemically stable surface enhanced scattering (SERS) probes for the analysis of blue BIC ballpoint pens. Phys Chem Chem Phys 2018; 19:14652-14658. [PMID: 28537611 DOI: 10.1039/c7cp01983a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Metal nanoinks constituted by Ag nanoparticles and Au nanorods were employed as probes for the Surface Enhanced Raman Scattering (SERS) analysis of a blue BIC ballpoint pen. The dye components of the pen ink were first separated by thin layer chromatography (TLC) and subsequently analysed by SERS at illumination wavelengths of 514 nm and 785 nm. Compared to normal Raman conditions, enhanced spectra were obtained for all separated spots, allowing easy identification of phthalocyanine Blue 38 and triarylene crystal violet in the ink mixture. A combination of effects such as molecular resonance, electromagnetic and chemical effects were the contributing factors to the generation of spectra enhanced compared to normal Raman conditions. Enhancement factors (EFs) between 5 × 103 and 3 × 106 were obtained, depending on the combination of SERS probes and laser illumination used. In contrast to previous conflicting reports, the metal nanoinks were chemically stable, allowing the collection of reproducible spectra for days after deposition on TLC plates. In addition and in advance to previously reported SERS probes, no need for additional aggregating agents or correction of electrostatic charge was necessary to induce the generation of enhanced SERS spectra.
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Affiliation(s)
- A Alyami
- Tyndall National Institute, University College Cork, Dyke Parade, Cork, Ireland.
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Albayati Z, Alyami A, Alomar S, Middleton D, Bonnett L, Aleem S, Flanagan BF, Christmas SE. The Influence of Cytomegalovirus on Expression of HLA-G and its Ligand KIR2DL4 by Human Peripheral Blood Leucocyte Subsets. Scand J Immunol 2017; 86:396-407. [PMID: 28817184 DOI: 10.1111/sji.12594] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Accepted: 08/11/2017] [Indexed: 01/23/2023]
Abstract
HLA-G is a non-classical class I HLA antigen, normally expressed in high levels only on extravillous cytotrophoblast. It has immunosuppressive properties in pregnancy and has also been found to be upregulated on leucocytes in viral infection. In this study, proportions of all leucocyte subsets expressing HLA-G were found to be low in healthy subjects positive or negative for cytomegalovirus (CMV). Significantly greater proportions of CD4+ CD69+ and CD56+ T cells expressed HLA-G compared to other T cells. However, following stimulation with CMV antigens or intact CMV, proportions of CD4+, CD8+, CD69+ and CD56+ T cells, and also B cells expressing HLA-G, were significantly increased in CMV+ subjects. Despite some subjects having alleles of HLA-G associated with high levels of expression, no relationship was found between HLA-G genotype and expression levels. Purified B cells from CMV+ subjects stimulated in mixed culture with CMV antigens showed significantly increased HLA-G mRNA expression by real-time polymerase chain reaction. Serum levels of soluble HLA-G were similar in CMV- and CMV+ subjects but levels in culture supernatants were significantly higher in cells from CMV+ than from CMV- subjects stimulated with CMV antigens. The HLA-G ligand KIR2DL4 was mainly expressed on NK cells and CD56+ T cells with no differences between CMV+ and CMV- subjects. Following stimulation with IL-2, an increase in the proportion of CD56+ T cells positive for KIR2DL4 was found, together with a significant decrease in CD56dimCD16+ NK cells. The results show that CMV influences HLA-G expression in healthy subjects and may contribute to viral immune evasion.
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Affiliation(s)
- Z Albayati
- Department of Clinical Infection, Microbiology & Immunology, Institute of Infection & Global Health, University of Liverpool, Liverpool, UK
| | - A Alyami
- Department of Clinical Infection, Microbiology & Immunology, Institute of Infection & Global Health, University of Liverpool, Liverpool, UK
| | - S Alomar
- Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - D Middleton
- Transplant Immunology, Royal Liverpool & Broadgreen University Hospital Trust, Liverpool, UK
| | - L Bonnett
- Department of Biostatistics, Institute of Translational Medicine, University of Liverpool, Liverpool, UK
| | - S Aleem
- Department of Clinical Infection, Microbiology & Immunology, Institute of Infection & Global Health, University of Liverpool, Liverpool, UK.,Department of Biochemistry, University of Agriculture, Faisalabad, Pakistan
| | - B F Flanagan
- Department of Women's and Children's Health, Institute of Translational Medicine, University of Liverpool, Alder Hey Children's NHS Foundation Trust Hospital, Liverpool, UK
| | - S E Christmas
- Department of Clinical Infection, Microbiology & Immunology, Institute of Infection & Global Health, University of Liverpool, Liverpool, UK
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Alyami A, Soares M, Sherriff J, Coombes F. A methodological appraisal of postprandial vascular function following OGTT in Middle-Eastern men. Journal of Nutrition & Intermediary Metabolism 2016. [DOI: 10.1016/j.jnim.2015.12.264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Abstract
INTRODUCTION Vitamin D has potential benefits for extraskeletal health. These could include an anti-inflammatory effect as well as a reduction in endothelial dysfunction. We aim to provide quality evidence for the hypothesis that supplementation with vitamin D will improve endothelial function (EF), possibly through the abrogation of systemic inflammation. METHODS AND ANALYSIS We will conduct a systematic review of all randomised controlled trials on vitamin D supplementation and EF lasting 12 weeks or more. The search will cover the period 2000-2015 and include studies that describe direct measures of EF, markers of endothelial cell (EC) activation and if concurrently reported, indicators of systemic inflammation. Study selection will follow the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines and study quality will be assessed by the Jadad score in addition to an evaluation of allocation concealment and data analysis. If sufficient data are available, a meta-analysis will be conducted. The effect sizes will be generated using Hedges' g score, for both fixed and random effect models. I(2) statistics and Galbraith plots will be used to assess heterogeneity and identify their potential sources. Potential publication and small sample size bias will be assessed by visual inspections of funnel plots and also Egger's test. Meta-regression analysis (if feasible) will be conducted with restricted maximum likelihood (REML) estimation method, controlling for potential confounders (demographics, study methods, location, etc). A backward elimination process will be applied in the regression modelling procedure. Subgroup analysis, conditional on number of studies retrieved and their sample size, will be stratified on participant disease category, total dose administered, degree of 25(OH)D change and type of supplement used. ETHICS AND DISSEMINATION Formal ethical approval is not required as primary data will not be collected. The results will be disseminated through a peer-reviewed publication, conference presentation and the popular press. TRIAL REGISTRATION NUMBER International Prospective Register for Systematic Reviews (PROSPERO) number CRD42014013523.
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Affiliation(s)
- A Alyami
- Directorate of Nutrition, Dietetics & Food Technology, School of Public Health, Curtin Health Innovation Research Institute of Ageing & Chronic Disease, Curtin University, Perth, Western Australia, Australia
| | - MJ Soares
- Directorate of Nutrition, Dietetics & Food Technology, School of Public Health, Curtin Health Innovation Research Institute of Ageing & Chronic Disease, Curtin University, Perth, Western Australia, Australia
| | - JL Sherriff
- Directorate of Nutrition, Dietetics & Food Technology, School of Public Health, Curtin Health Innovation Research Institute of Ageing & Chronic Disease, Curtin University, Perth, Western Australia, Australia
| | - Y Zhao
- Directorate of Epidemiology & Biostatistics, School of Public Health, Curtin University, Perth, Western Australia, Australia
| | - J Hallett
- Collaboration for Evidence, Research and Impact in Public Health, School of Public Health, Curtin University, Perth, Western Australia, Australia
| | - F Coombes
- University Health Service, Support Services, Curtin University, Perth, Western Australia, Australia
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Soares M, Alyami A, Sherriff J, Mamo J. Vitamin D status and endothelial function: An update of randomised controlled trials. Journal of Nutrition & Intermediary Metabolism 2014. [DOI: 10.1016/j.jnim.2014.10.120] [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] Open
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Alyami A, Lam V, Mamo J, Sherriff J, James A, Zhao Y, Soares M. Vitamin D status, dyslipedemia and markers of endothelial activation in older adults. Journal of Nutrition & Intermediary Metabolism 2014. [DOI: 10.1016/j.jnim.2014.10.176] [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] Open
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Alyami A, Soares M, Sherriff J, Mamo J. Vitamin D & endothelial function. Indian J Med Res 2014; 140:483-90. [PMID: 25488441 PMCID: PMC4277133] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Indexed: 11/04/2022] Open
Abstract
There is increasing interest in the extra-skeletal roles of vitamin D for health and well-being. Poor vitamin D status has been associated with obesity, cardiovascular disease, type 2 diabetes and mental health. Endothelial dysfunction may underscore insulin resistance and hence predispose to both cardiovascular disease (CVD) and type 2 diabetes. The objective of this review was to gain an appreciation of the recent causative evidence linking vitamin D and endothelial function. The PubMed database was searched from 2009 to date. Key words used were vitamin D, supplementation, systemic inflammation, endothelium, endothelial dysfunction and humans. Selected articles were restricted to the English language and to randomized control trials (RCTs) of vitamin D supplementation with direct measures of endothelial function. Final inclusion was based on a quality rating ≥ 3, based on the Jadad score. Ten RCTs met these criteria and were summarized for their outcomes. Only two studies showed an improvement in flow mediated dilatation with vitamin D. Three other studies reported decreases in C-reactive protein, platelet activation inhibitor-1, tissue plasminogen activator or B type natriuretic peptide. Recent evidence from good quality RCTs did not support a beneficial effect of vitamin D on vascular reactivity. Future intervention studies may need to target a higher vitamin D status and longer duration to determine whether the vitamin has a regulatory role in endothelial function.
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Affiliation(s)
- A. Alyami
- Directorate of Nutrition, Dietetics & Food Technology, School of Public Health, Curtin University, Perth, Australia
| | - M.J. Soares
- Directorate of Nutrition, Dietetics & Food Technology, School of Public Health, Curtin University, Perth, Australia
| | - J.L. Sherriff
- Directorate of Nutrition, Dietetics & Food Technology, School of Public Health, Curtin University, Perth, Australia
| | - J.C. Mamo
- Directorate of Nutrition, Dietetics & Food Technology, School of Public Health, Curtin University, Perth, Australia
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