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Reyes ML, Vizcaya C, Le Roy C, Loureiro C, Brinkmann K, Arancibia M, Campos L, Iturriaga C, Pérez-Mateluna G, Rojas-McKenzie M, Domínguez G, Camargo CA, Borzutzky A. Weekly Vitamin D Supplementation to Prevent Acute Respiratory Infections in Young Children at Different Latitudes: A Randomized Controlled Trial. J Pediatr 2024:114249. [PMID: 39181322 DOI: 10.1016/j.jpeds.2024.114249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2024] [Accepted: 08/18/2024] [Indexed: 08/27/2024]
Abstract
OBJECTIVE To evaluate the effectiveness of weekly vitamin D supplementation in reducing the number of acute respiratory infections (ARI) in preschool children. STUDY DESIGN Randomized, double-blind, placebo-controlled trial in 303 children aged 1.5-3.5 years from 2014 to 2105 in three Chilean cities at different latitudes: Santiago (33ºS, n=101), Talcahuano (37ºS, n=103), and Punta Arenas (53ºS, n=99). Participants were allocated (1:1:1) to receive placebo, cholecalciferol (VD3) 5,600 IU/week (low-dose), or 11,200 IU/week (high-dose) for 6 months. Primary outcome was parent-reported number of ARI; secondary outcomes included number of ARI hospitalizations, change of serum 25(OH)D and LL37/cathelicidin levels, and adverse events. RESULTS The mean age of participants was 26 ± 6 months; 45% were female. Baseline 25(OH)D was 24.9 ± 6.1 ng/ml, with 23% having 25(OH)D <20 ng/ml. No significant baseline clinical or laboratory differences were observed among groups. Overall, 64% (n=194) completed study participation, without baseline differences between subjects lost to follow-up versus those completing participation or differences in completion rates across groups. After 6 months, a dose-dependent increase in serum 25(OH)D was observed from the VD3 intervention (p<0.001), with a higher proportion of subjects ending the trial with 25(OH)D <20 ng/ml in the placebo group (30.8%) versus the low-dose (7.4%) and high-dose groups (5.1%). However, no group differences were observed in number of ARI (p=0.85), ARI hospitalizations (p=0.20), LL-37/cathelicidin change (p=0.30), or adverse events (p=0.41). CONCLUSIONS While weekly VD3 supplementation, in doses equivalent to 800 IU and 1600 IU daily, was associated with improved 25(OH)D levels in preschoolers, we did not find a reduced number of ARI in this sample.
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Affiliation(s)
- María Loreto Reyes
- Endocrinology Section, Division of Pediatrics, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Cecilia Vizcaya
- Department of Pediatric Infectious Diseases and Immunology, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Catalina Le Roy
- Department of Pediatric Gastroenterology and Nutrition, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Carolina Loureiro
- Endocrinology Section, Division of Pediatrics, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Karin Brinkmann
- Hospital Clínico Magallanes Dr. Lautaro Navarro Avaria, Punta Arenas, Chile
| | | | | | - Carolina Iturriaga
- Department of Pediatric Infectious Diseases and Immunology, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Guillermo Pérez-Mateluna
- Department of Pediatric Infectious Diseases and Immunology, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Maite Rojas-McKenzie
- Department of Pediatric Infectious Diseases and Immunology, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Gonzalo Domínguez
- Endocrinology Section, Division of Pediatrics, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Carlos A Camargo
- Department of Emergency Medicine and Division of Rheumatology, Allergy, and Immunology, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, USA
| | - Arturo Borzutzky
- Department of Pediatric Infectious Diseases and Immunology, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.
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Morio KA, Sternowski RH, Brogden KA. Induction of Endogenous Antimicrobial Peptides to Prevent or Treat Oral Infection and Inflammation. Antibiotics (Basel) 2023; 12:antibiotics12020361. [PMID: 36830272 PMCID: PMC9952314 DOI: 10.3390/antibiotics12020361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 02/03/2023] [Accepted: 02/05/2023] [Indexed: 02/11/2023] Open
Abstract
Antibiotics are often used to treat oral infections. Unfortunately, excessive antibiotic use can adversely alter oral microbiomes and promote the development of antibiotic-resistant microorganisms, which can be difficult to treat. An alternate approach could be to induce the local transcription and expression of endogenous oral antimicrobial peptides (AMPs). To assess the feasibility and benefits of this approach, we conducted literature searches to identify (i) the AMPs expressed in the oral cavity; (ii) the methods used to induce endogenous AMP expression; and (iii) the roles that expressed AMPs may have in regulating oral inflammation, immunity, healing, and pain. Search results identified human neutrophil peptides (HNP), human beta defensins (HBD), and cathelicidin AMP (CAMP) gene product LL-37 as prominent AMPs expressed by oral cells and tissues. HNP, HBD, and LL-37 expression can be induced by micronutrients (trace elements, elements, and vitamins), nutrients, macronutrients (mono-, di-, and polysaccharides, amino acids, pyropeptides, proteins, and fatty acids), proinflammatory agonists, thyroid hormones, and exposure to ultraviolet (UV) irradiation, red light, or near infrared radiation (NIR). Localized AMP expression can help reduce infection, inflammation, and pain and help oral tissues heal. The use of a specific inducer depends upon the overall objective. Inducing the expression of AMPs through beneficial foods would be suitable for long-term health protection. Additionally, the specialized metabolites or concentrated extracts that are utilized as dosage forms would maintain the oral and intestinal microbiome composition and control oral and intestinal infections. Inducing AMP expression using irradiation methodologies would be applicable to a specific oral treatment area in addition to controlling local infections while regulating inflammatory and healing processes.
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Affiliation(s)
| | | | - Kim A. Brogden
- College of Dentistry, The University of Iowa, Iowa City, IA 52242, USA
- Correspondence:
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Antimicrobial Peptides in Early-Life Host Defense, Perinatal Infections, and Necrotizing Enterocolitis—An Update. J Clin Med 2022; 11:jcm11175074. [PMID: 36079001 PMCID: PMC9457252 DOI: 10.3390/jcm11175074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 08/21/2022] [Accepted: 08/26/2022] [Indexed: 11/17/2022] Open
Abstract
Host defense against early-life infections such as chorioamnionitis, neonatal sepsis, or necrotizing enterocolitis (NEC) relies primarily on innate immunity, in which antimicrobial peptides (AMPs) play a major role. AMPs that are important for the fetus and neonate include α and β defensins, cathelicidin LL-37, antiproteases (elafin, SLPI), and hepcidin. They can be produced by the fetus or neonate, the placenta, chorioamniotic membranes, recruited neutrophils, and milk-protein ingestion or proteolysis. They possess antimicrobial, immunomodulating, inflammation-regulating, and tissue-repairing properties. AMPs are expressed as early as the 13th week and increase progressively through gestation. Limited studies are available on AMP expression and levels in the fetus and neonate. Nevertheless, existing evidence supports the role of AMPs in pathogenesis of chorioamnionitis, neonatal sepsis, and NEC, and their association with disease severity. This suggests a potential role of AMPs in diagnosis, prevention, prognosis, and treatment of sepsis and NEC. Herein, we present an overview of the antimicrobial and immunomodulating properties of human AMPs, their sources in the intrauterine environment, fetus, and neonate, and their changes during pre- and post-natal infections and NEC. We also discuss emerging data regarding the potential utility of AMPs in early-life infections, as diagnostic or predictive biomarkers and as therapeutic alternatives or adjuncts to antibiotic therapy considering the increase of antibiotic resistance in neonatal intensive care units.
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Amiri M, Rostami M, Bidhendi-Yarandi R, Fallahzadeh A, Simbar M, Ramezani Tehrani F. Relationship between vitamin D status in the first trimester of the pregnancy and gestational weight gain: a mediation analysis. Arch Gynecol Obstet 2021; 305:495-504. [PMID: 34333703 DOI: 10.1007/s00404-021-06163-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Accepted: 07/27/2021] [Indexed: 12/28/2022]
Abstract
PURPOSE To evaluate the total, and direct effects of vitamin D, measured by circulating 25-hydroxyvitamin D [25(OH)D] levels, on GWG after adjustment for confounding variables, and then assess the indirect effects by demonstrating the role of gestational age at birth as a mediator in this association. METHODS Data collected in "Khuzestan Vitamin D Deficiency Screening Program in Pregnancy" were used for the present study; it included the data of 900 pregnant women referred to the health centers of Shushtar (Khuzestan Province, Iran), whose vitamin D status during the third trimester of pregnancy was available. A mediation analysis was applied to detect the causal relationship between serum level of 25(OH)D, covariates (maternal age, parity, education level, and baseline maternal weight), mediator (gestational age), and outcome (GWG). RESULTS Of 900 pregnant women referred to the health centers, a total of 726 eligible participants were analyzed for the study. The adjusted total effect of vitamin D on GWG was estimated 0.07 (95% CI 0.06, 0.09; P = 0.000). This study also revealed adjusted direct effect of vitamin D on GWG was statistically significant 0.02 (95% CI: 0.003, 0.04; P = 0.021). In addition, the adjusted indirect effect of this micronutrient on GWG by considering gestational age as a mediator was found to be significant [0.05 (95% CI 0.04, 0.06; P = 0.000)]. This study revealed an increase in the trend of weight gain during pregnancy trimesters for women with different levels of 25(OH)D; however, women with severe vitamin D deficiency had the lowest speed as compared to moderate and normal levels. CONCLUSION This study shows that maternal vitamin D status directly affects the gestational weight gain independent of gestational age. Therefore, the detection and treatment of women with vitamin D inadequacy can directly improve the trend of their weight gain in addition to its indirect effect on reducing the risk of preterm delivery.
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Affiliation(s)
- Mina Amiri
- Reproductive Endocrinology Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, No 24, Parvane Street, Yaman Street, Velenjak, Tehran, Iran
| | - Maryam Rostami
- Department of Social Medicine, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Razieh Bidhendi-Yarandi
- Department of Biostatistics, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Aida Fallahzadeh
- School of Medicine, Tehran University of Medical Science, Tehran, Iran
| | - Masoumeh Simbar
- Department of Midwifery and Reproductive Health, Faculty of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Fahimeh Ramezani Tehrani
- Reproductive Endocrinology Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, No 24, Parvane Street, Yaman Street, Velenjak, Tehran, Iran.
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Sunlight exposure, consumption of vitamin D-rich foods and vulvovaginal candidiasis in an African population: a prevalence case-control study. Eur J Clin Nutr 2019; 74:518-526. [PMID: 31636409 DOI: 10.1038/s41430-019-0517-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 10/02/2019] [Accepted: 10/03/2019] [Indexed: 11/08/2022]
Abstract
BACKGROUND/OBJECTIVES To date, only two studies have investigated the relationship between vitamin D (vitD) deficiency and candidiasis in spite of vitD's antimicrobial and immunomodulatory roles. We examined the relationship between sunlight exposure and consumption of vitD-rich foods, markers of vitD status, and vulvovaginal candidiasis (VVC) in an African population to add to the limited evidence and stimulate additional research. SUBJECTS/METHODS Three hundred cases (females diagnosed as suffering from VVC) and three hundred controls (females diagnosed as suffering from any condition other than VVC) were selected from three health facilities in Cape Coast, Ghana. Sunlight exposure was assessed in a structured questionnaire with a food frequency questionnaire used to ascertain the frequency of consumption of vitD-rich foods. RESULTS Self-reported low sunlight exposure was associated with 3.38 (95% CI:1.99, 5.74) increased odds of VVC. Low and moderate sunlight exposure estimated by outdoor visits was also associated with increased odds of VVC. In sensitivity analysis restricted to matched sunlight exposure data, low and moderate exposure was associated with 5.78 (95% CI: 2.57, 12.99) and 3.53 (95% CI: 1.85, 6.75) increased odds of VVC. Odds of VVC increased with decreasing levels of consumption of vitD-rich foods (Likelihood-ratio test trend p = 0.1382). In the joint analysis, low and moderate vitD intake was associated with much higher increased odds of VVC. CONCLUSIONS Our findings should be confirmed in prospective studies and clinical trials to strengthen the evidence base for preventive action and to also inform clinical decision making.
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Hauger H, Ritz C, Mortensen C, Mølgaard C, Metzdorff SB, Frøkiær H, Damsgaard CT. Winter cholecalciferol supplementation at 55°N has little effect on markers of innate immune defense in healthy children aged 4–8 years: a secondary analysis from a randomized controlled trial. Eur J Nutr 2018; 58:1453-1462. [DOI: 10.1007/s00394-018-1671-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 03/21/2018] [Indexed: 01/11/2023]
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Amegah AK, Klevor MK, Wagner CL. Maternal vitamin D insufficiency and risk of adverse pregnancy and birth outcomes: A systematic review and meta-analysis of longitudinal studies. PLoS One 2017; 12:e0173605. [PMID: 28306725 PMCID: PMC5357015 DOI: 10.1371/journal.pone.0173605] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Accepted: 02/23/2017] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Three previous reviews on the association of vitamin D insufficiency in pregnancy with preterm birth (PTB) and stillbirth were limited in scope and deemed inconclusive. With important new evidence accumulating, there is the need to update the previous estimates and assess evidence on other clinically important outcomes such as spontaneous abortion and Apgar score. We conducted a systematic review and meta-analysis to evaluate the quality and strength of the available evidence on the relations between vitamin D nutritional status, and pregnancy and birth outcomes. METHODS PubMed and Scopus databases were searched from their inception to June, 2015 with no language restrictions imposed. Eighteen longitudinal studies satisfied the inclusion criteria. Random effects model was applied in computing the summary effect estimates and their corresponding 95% confidence intervals. RESULTS Serum 25(OH)D levels <75 nmol/l was associated with 83% (95% CI: 1.23, 2.74) and 13% (95% CI: 0.94, 1.36) increased risk of PTB measured at <32-34 weeks and <35-37 weeks, respectively. An inverse dose-response relation was observed for both PTB outcome. Serum 25(OH)D levels <75 nmol/l was also associated with 11% increased risk of spontaneous PTB (<35-37 weeks; RR = 1.11; 95% CI: 0.75, 1.65) with a dose-response relation also noted. Vitamin D insufficiency was not associated with risk of spontaneous abortion and stillbirth (RR of 1.04 [95% CI: 0.95, 1.13] and 1.02 [95% CI: 0.96, 1.09], respectively), as well as short gestational length (ES = -0.24, 95% CI: -0.69, 0.22), and low Apgar score. CONCLUSIONS We found vitamin D insufficiency to be associated with risk of PTB. Regarding spontaneous abortion and stillbirth, the available evidence suggest no association with low vitamin D levels. The evidence on vitamin D nutrition and Apgar score is conflicting and controversial. Overall, the experimental evidence uncovered was small and weak. Hence, the benefits of vitamin D supplementation during pregnancy should be further evaluated through rigorous intervention studies.
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Affiliation(s)
- A. Kofi Amegah
- Public Health Research Group, Department of Biomedical Sciences, School of Allied Health Sciences, University of Cape Coast, Cape Coast, Ghana
| | - Moses K. Klevor
- Department of Clinical Nutriton and Dietetics, University of Cape Coast, Cape Coast, Ghana
| | - Carol L. Wagner
- Medical University of South Carolina Children’s Hospital, Charleston, SC, United States of America
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8
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Jin HS, Lee HM, Lee DH, Cha GH, Cho KS, Jang J, Jo EK. Functional characterisation of the Drosophila cg6568 gene in host defence against Mycobacterium marinum. Microbes Infect 2017; 19:351-357. [PMID: 28245983 DOI: 10.1016/j.micinf.2017.02.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Revised: 01/16/2017] [Accepted: 02/17/2017] [Indexed: 10/20/2022]
Abstract
Mycobacterium marinum is a pathogenic mycobacterial species closely related to Mycobacterium tuberculosis. In this study, we established a mycobacterial infection model of Drosophila melanogaster to characterize the role played by cg6568, a homolog of the human cathelicidin gene, in the innate defense against infection. Drosophila cg6568 was expressed at various levels during all developmental stages, and the expression levels were modulated by M. marinum in a time-dependent manner. 20-hydroxyecdysone induced Drosophila cg6568 transcription both in vitro and in vivo. Using flies expressing cg6568 RNAi, we found that cg6568 was essential both for D. melanogaster survival and the exertion of antimicrobial effects during M. marinum infection. Thus, we named the gene product a cathelicidin-like antimicrobial protein of D. melanogaster (dCAMP). Our results indicate that dCAMP is crucial in terms of the innate D. melanogaster defense during M. marinum infection.
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Affiliation(s)
- Hyo Sun Jin
- Department of Microbiology, Chungnam National University School of Medicine, Daejeon, South Korea; Biomedical Research Institute, Chungnam National University Hospital, Daejeon, South Korea
| | - Hye-Mi Lee
- Department of Microbiology, Chungnam National University School of Medicine, Daejeon, South Korea
| | - Da-Hye Lee
- Pulmonary Medicine, Chungnam National University School of Medicine, Daejeon, South Korea
| | - Guang-Ho Cha
- Infection Biology, Chungnam National University School of Medicine, Daejeon, South Korea
| | - Kyoung Sang Cho
- Department of Biological Sciences, Konkuk University, Seoul, South Korea
| | - Jichan Jang
- Department of Microbiology, Chungnam National University School of Medicine, Daejeon, South Korea; Molecular Mechanism of Antibiotics, Division of Life Science, Research Institute of Life Science, Gyeongsang National University, Jinju, Gyeongnam, South Korea.
| | - Eun-Kyeong Jo
- Department of Microbiology, Chungnam National University School of Medicine, Daejeon, South Korea.
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Battersby AJ, Khara J, Wright VJ, Levy O, Kampmann B. Antimicrobial Proteins and Peptides in Early Life: Ontogeny and Translational Opportunities. Front Immunol 2016; 7:309. [PMID: 27588020 PMCID: PMC4989132 DOI: 10.3389/fimmu.2016.00309] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Accepted: 07/29/2016] [Indexed: 12/18/2022] Open
Abstract
While developing adaptive immune responses, young infants are especially vulnerable to serious infections, including sepsis, meningitis, and pneumonia. Antimicrobial proteins and peptides (APPs) are key effectors that function as broad-spectrum anti-infectives. This review seeks to summarize the clinically relevant functional qualities of APPs and the increasing clinical trial evidence for their use to combat serious infections in infancy. Levels of APPs are relatively low in early life, especially in infants born preterm or with low birth weight (LBW). There are several rationales for the potential clinical utility of APPs in the prevention and treatment of infections in infants: (a) APPs may be most helpful in those with reduced levels; (b) during sepsis microbial products signal via pattern recognition receptors causing potentially harmful inflammation that APPs may counteract; and (c) in the era of antibiotic resistance, development of new anti-infective strategies is essential. Evidence supports the potential clinical utility of exogenous APPs to reduce infection-related morbidity in infancy. Further studies should characterize the ontogeny of antimicrobial activity in mucosal and systemic compartments, and examine the efficacy of exogenous-APP formulations to inform translational development of APPs for infant groups.
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Affiliation(s)
- Anna J Battersby
- Academic Paediatrics, Imperial College London, London, UK; Medical Research Council (MRC) Unit, Vaccines and Immunity Theme, Fajara, Gambia
| | - Jasmeet Khara
- Academic Paediatrics, Imperial College London, London, UK; Department of Pharmacy, National University of Singapore, Singapore
| | | | - Ofer Levy
- Precision Vaccines Program, Department of Medicine, Division of Infectious Diseases, Boston Children's Hospital, Boston, MA, USA; Harvard Medical School, Boston, MA, USA
| | - Beate Kampmann
- Academic Paediatrics, Imperial College London, London, UK; Medical Research Council (MRC) Unit, Vaccines and Immunity Theme, Fajara, Gambia
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Matsumura T, Sugiyama N, Murayama A, Yamada N, Shiina M, Asabe S, Wakita T, Imawari M, Kato T. Antimicrobial peptide LL-37 attenuates infection of hepatitis C virus. Hepatol Res 2016; 46:924-32. [PMID: 26606891 DOI: 10.1111/hepr.12627] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 11/09/2015] [Accepted: 11/18/2015] [Indexed: 12/20/2022]
Abstract
AIM Although recent studies indicate that supplementation with vitamin D (VD) potentiates a sustained viral response by interferon-based therapy to chronic hepatitis C, detailed mechanisms are not fully defined. The production of cathelicidin, an antimicrobial peptide, has been demonstrated to be part of the VD-dependent antimicrobial pathway in innate immunity. Cathelicidin is known to directly kill or inhibit the growth of microbial pathogens including mycobacteria and viruses. METHODS We used a hepatitis C virus (HCV) cell culture system to clarify the anti-HCV effects of the human cathelicidin, LL-37. HuH-7 cells were administrated with LL-37 and infected with cell culture-generated HCV (HCVcc). HCV propagation was estimated by measuring the level of HCV core antigen (Ag). RESULTS Treatment with LL-37 resulted in decreased intra- and extracellular levels of HCV core Ag, suggesting inhibition of HCV propagation. To assess the effects of LL-37 on HCV replication, JFH-1 subgenomic replicon RNA-transfected cells were treated with LL-37. However, inhibition of HCV replication was not detected by this assay. To clarify the effects on HCV infection, we treated HCVcc with LL-37 and removed the antimicrobial peptide prior to use of the virus in infection. This exposure of HCVcc to LL-37 diminished the infectivity titers in a dose-dependent fashion. Iodixanol density gradient analysis revealed that the peak fraction of infectivity titer was eliminated by LL-37 treatment. CONCLUSION The VD-associated antimicrobial peptide LL-37 attenuated the infectivity of HCV. This anti-HCV effect of LL-37 may explain the contribution of VD to the improved efficacy of interferon-based therapy.
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Affiliation(s)
- Takuya Matsumura
- Department of Virology II, National Institute of Infectious Diseases, Tokyo.,Division of Gastroenterology, Department of Medicine, Showa University School of Medicine, Tokyo
| | - Nao Sugiyama
- Department of Virology II, National Institute of Infectious Diseases, Tokyo
| | - Asako Murayama
- Department of Virology II, National Institute of Infectious Diseases, Tokyo
| | - Norie Yamada
- Department of Virology II, National Institute of Infectious Diseases, Tokyo
| | - Masaaki Shiina
- Department of Gastroenterology and Hepatology, Shin-Yurigaoka General Hospital, Kawasaki
| | - Shinichi Asabe
- Division of Gastroenterology, Saitama Medical Center, Jichi Medical University, Saitama
| | - Takaji Wakita
- Department of Virology II, National Institute of Infectious Diseases, Tokyo
| | - Michio Imawari
- Research Institute for Gastrointestinal and Liver Diseases, Shin-Yurigaoka General Hospital, Kawasaki, Japan
| | - Takanobu Kato
- Department of Virology II, National Institute of Infectious Diseases, Tokyo
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11
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Thijs W, Janssen K, van Schadewijk AM, Papapoulos SE, le Cessie S, Middeldorp S, Melissant CF, Rabe KF, Hiemstra PS. Nasal Levels of Antimicrobial Peptides in Allergic Asthma Patients and Healthy Controls: Differences and Effect of a Short 1,25(OH)2 Vitamin D3 Treatment. PLoS One 2015; 10:e0140986. [PMID: 26545199 PMCID: PMC4636236 DOI: 10.1371/journal.pone.0140986] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Accepted: 09/04/2015] [Indexed: 11/30/2022] Open
Abstract
Background Allergy is often accompanied by infections and lower levels of antimicrobial peptides (AMPs). Vitamin D has been shown to increase expression of selected AMPs. In this study we investigated whether antimicrobial peptide levels in nasal secretions of allergic asthma patients are lower than in healthy controls, and whether administration of the active form of vitamin D (1,25(OH)2D3) affects these antimicrobial peptide levels. Methods The levels of antimicrobial peptides in nasal secretions were compared between 19 allergic asthma patients and 23 healthy controls. The effect of seven days daily oral treatment with 2 μg 1,25(OH)2D3 on antimicrobial peptides in nasal secretions was assessed in a placebo-controlled cross-over clinical study. Results Levels of neutrophil α-defensins (human neutrophil peptides 1–3; HNP1-3) and lipocalin 2 (LCN2; also known as NGAL) were significantly lower in asthmatics, but no differences in LL-37 and SLPI were detected. Treatment with a short-term 1,25(OH)2D3 caused a small increase in HNP1-3, but not when the asthma and control groups were analyzed separately. LL-37, LCN2 and SLPI did not change after treatment with 1,25(OH)2D3. Conclusion Levels of the antimicrobial peptides HNP1-3 and LCN2 are lower in nasal secretions in asthmatics and are not substantially affected by a short-term treatment with active vitamin D.
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Affiliation(s)
- Willemien Thijs
- Department of Pulmonology, Leiden University Medical Center, Leiden, The Netherlands
- Department of Pulmonology, Spaarne Hospital, Hoofddorp, The Netherlands
- * E-mail:
| | - Kirsten Janssen
- Department of Pulmonology, Leiden University Medical Center, Leiden, The Netherlands
| | | | | | - Saskia le Cessie
- Department of Clinical Epidemiology and Department of Medical Statistics, Leiden University Medical Center, Leiden, The Netherlands
| | - Saskia Middeldorp
- Department of Vascular Medicine, Academic Medical Center, Amsterdam, The Netherlands
| | | | - Klaus F. Rabe
- Department of Pulmonology, Leiden University Medical Center, Leiden, The Netherlands
- Department of Pulmonology and Thoracic Surgery, Lungen Clinic Grosshansdorf, Grosshansdorf, Germany
| | - Pieter S. Hiemstra
- Department of Pulmonology, Leiden University Medical Center, Leiden, The Netherlands
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Missailidis C, Höijer J, Johansson M, Ekström L, Bratt G, Hejdeman B, Bergman P. Vitamin D status in Well-Controlled Caucasian HIV Patients in Relation to Inflammatory and Metabolic Markers--A Cross-Sectional Cohort Study in Sweden. Scand J Immunol 2015; 82:55-62. [PMID: 25833795 PMCID: PMC4691317 DOI: 10.1111/sji.12299] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Accepted: 03/18/2015] [Indexed: 02/06/2023]
Abstract
To study vitamin D (25OH D3) in relation to (i) microbial translocation (ii) systemic inflammation and (iii) blood lipid markers, in Caucasian, well-controlled HIV patients and healthy controls, plasma and serum samples from n = 97 male, HIV patients on HAART with immeasurable viral load (<20 copies/ml) since median 6.5 years and no concurrent inflammatory or infectious disease and n = 30 healthy controls were analysed for (i) LPS; (ii) sCD14, hsCRP, IL-4, IL-6, IL-10, IL-17, MCP-1 and IFN-γ; as well as (iii) blood lipids. Vitamin D levels were similarly distributed and equally low in both HIV patients and controls. There was no association between vitamin D levels and markers of microbial translocation, systemic inflammation or dyslipidemia. LPS levels were similar in both groups but HIV patients expressed higher levels of sCD14 and hsCRP, with HIV as an independent risk factor. HIV patients had higher cholesterol and Apo B levels. Notably, more HIV patients smoked and smoking was associated with lower vitamin D levels. In conclusion; these well-treated Caucasian HIV patients had similar vitamin D levels as healthy controls. However, despite perfect virological control, they exhibited slightly increased inflammatory markers and disturbed blood lipids. However, neither of these parameters were associated with low vitamin D levels but appeared to be linked to the HIV-disease per se. Thus, the rationale for vitamin D substitution as a way to improve microbial translocation and systemic inflammation is not fully supported in this HIV population.
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Affiliation(s)
- C Missailidis
- Department of Laboratory Medicine (LABMED), Division of Clinical Microbiology, Karolinska Institute, Stockholm, Sweden.,Department of Infectious Diseases, Karolinska University Hospital, Stockholm, Sweden
| | - J Höijer
- Department of Environmental Medicine, Unit of Biostatistics, Karolinska Institute, Stockholm, Sweden
| | - M Johansson
- Department of Laboratory Medicine (LABMED), Division of Clinical Pharmacology, Karolinska Institute, Stockholm, Sweden
| | - L Ekström
- Department of Laboratory Medicine (LABMED), Division of Clinical Pharmacology, Karolinska Institute, Stockholm, Sweden
| | - G Bratt
- Department of Infectious Diseases, Venhälsan, South General Hospital, Stockholm, Sweden
| | - B Hejdeman
- Department of Infectious Diseases, Venhälsan, South General Hospital, Stockholm, Sweden
| | - P Bergman
- Department of Laboratory Medicine (LABMED), Division of Clinical Microbiology, Karolinska Institute, Stockholm, Sweden.,Department of Medicine, Center for Infectious Medicine (CIM), Karolinska Institute, Stockholm, Sweden
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Bandurska K, Berdowska A, Barczyńska-Felusiak R, Krupa P. Unique features of human cathelicidin LL-37. Biofactors 2015; 41:289-300. [PMID: 26434733 DOI: 10.1002/biof.1225] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 07/29/2015] [Indexed: 01/13/2023]
Abstract
Cathelicidins are antimicrobial peptides produced by humans and animals in response to various pathogenic microbes. This review intends to provide a brief overview of the expression, structure, properties and function of human cathelicidin LL-37 which may be a therapeutic agent against a variety of bacterial and viral diseases, cancers, and hard-to-heal wounds. Cathelicidins act as a primary defense against bacteria and other pathogens in the case of inflammation. They are able to kill bacteria and fungi, inhibit and destroy bacterial biofilms, and possess antiviral and antiparasitics properties. They can also play a role in angiogenesis, wound healing, and the regulation of apoptosis. The host defense peptide LL-37 has emerged as a novel modulator of tumor growth and metastasis in carcinogenesis of various types of cancers. LL-37 is an antimicrobial peptide able of inducing various effects. It acts as an anti- and pro- inflammatory factor. Cathelicidins are able to directly and selectively destroy membranes of various microbes and cancer cells, but they do not attack normal cells. The role of cathelicidins in cancer is double-sided. They play an important role in killing cancer cells and may provide a new possibility for the development of cancer therapeutics. However, they also can participate in carcinogenesis. Due to its activity spectrum LL-37 could be applied in pharmacotherapy. Cathelicidin peptides could serve as a template for the development of modern anti-microbial and anti-viral drugs. LL-37 is an excellent candidate to develop into therapeutics for infected wounds.
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Affiliation(s)
- Katarzyna Bandurska
- Department of Microbiology and Biotechnology, Jan Dlugosz University in Czestochowa, Czestochowa, Poland
| | - Agnieszka Berdowska
- Department of Microbiology and Biotechnology, Jan Dlugosz University in Czestochowa, Czestochowa, Poland
| | | | - Piotr Krupa
- Department of Microbiology and Biotechnology, Jan Dlugosz University in Czestochowa, Czestochowa, Poland
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Lowry MB, Guo C, Borregaard N, Gombart AF. Regulation of the human cathelicidin antimicrobial peptide gene by 1α,25-dihydroxyvitamin D3 in primary immune cells. J Steroid Biochem Mol Biol 2014; 143:183-91. [PMID: 24565560 PMCID: PMC4127358 DOI: 10.1016/j.jsbmb.2014.02.004] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Revised: 02/12/2014] [Accepted: 02/15/2014] [Indexed: 01/08/2023]
Abstract
Production of the human cathelicidin antimicrobial peptide gene (hCAP18/LL-37), is regulated by 1α,25-dihydroxyvitamin D3 (1,25D3) and is critical in the killing of pathogens by innate immune cells. In addition, secreted LL-37 binds extracellular receptors and modulates the recruitment and activity of both innate and adaptive immune cells. Evidence suggests that during infections activated immune cells locally produce increased levels of 1,25D3 thus increasing production of hCAP18/LL-37. The relative expression levels of hCAP18/LL-37 among different immune cell types are not well characterized. The aim of this study was to determine the relative levels of hCAP18/LL-37 in human peripheral blood immune cells and determine to what extent 1,25D3 increased its expression in peripheral blood-derived cells. We show for the first time, a hierarchy of expression of hCAP18 in freshly isolated cells with low levels in lymphocytes, intermediate levels in monocytes and the highest levels found in neutrophils. In peripheral blood-derived cells, the highest levels of hCAP18 following treatment with 1,25D3 were in macrophages, while comparatively lower levels were found in GM-CSF-derived dendritic cells and osteoclasts. We also tested whether treatment with parathyroid hormone in combination with 1,25D3 would enhance hCAP18 induction as has been reported in skin cells, but we did not find enhancement in any immune cells tested. Our results indicate that hCAP18 is expressed at different levels according to cell type and lineage. Furthermore, potent induction of hCAP18 by 1,25D3 in macrophages and dendritic cells may modulate functions of both innate and adaptive immune cells at sites of infection.
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Affiliation(s)
- Malcolm B Lowry
- Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA; Department of Microbiology, Oregon State University, Corvallis, OR 97331, USA
| | - Chunxiao Guo
- Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA; Department of Biochemistry and Biophysics, Oregon State University, Corvallis, OR 97331, USA
| | - Niels Borregaard
- Department of Hematology, Rigshospitalet-4042, University of Copenhagen, Copenhagen DK-1200, Denmark
| | - Adrian F Gombart
- Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA; Department of Biochemistry and Biophysics, Oregon State University, Corvallis, OR 97331, USA.
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Clancy N, Onwuneme C, Carroll A, McCarthy R, McKenna MJ, Murphy N, Molloy EJ. Vitamin D and neonatal immune function. J Matern Fetal Neonatal Med 2012; 26:639-46. [DOI: 10.3109/14767058.2012.746304] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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A comprehensive summary of LL-37, the factotum human cathelicidin peptide. Cell Immunol 2012; 280:22-35. [PMID: 23246832 DOI: 10.1016/j.cellimm.2012.11.009] [Citation(s) in RCA: 405] [Impact Index Per Article: 33.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Revised: 11/09/2012] [Accepted: 11/15/2012] [Indexed: 01/01/2023]
Abstract
Cathelicidins are a group of antimicrobial peptides. Since their discovery, it has become clear that they are an exceptional class of peptides, with some members having pleiotropic effects. Not only do they possess an antibacterial, antifungal and antiviral function, they also show a chemotactic and immunostimulatory/-modulatory effect. Moreover, they are capable of inducing wound healing, angiogenesis and modulating apoptosis. Recent insights even indicate for a role of these peptides in cancer. This review provides a comprehensive summary of the most recent and relevant insights concerning the human cathelicidin LL-37.
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de Oca EPM. Antimicrobial peptide elicitors: New hope for the post-antibiotic era. Innate Immun 2012; 19:227-41. [DOI: 10.1177/1753425912460708] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Antimicrobial peptides or host defense peptides are fundamental components of human innate immunity. Recent and growing evidence suggests they have a role in a broad range of diseases, including cancer, allergies and susceptibility to infection, including HIV/AIDS. Antimicrobial peptide elicitors (APEs) are physical, biological or chemical agents that boost human antimicrobial peptide expression. The current knowledge of APEs and their potential use in the treatment of human infectious diseases are reviewed, and a classification system for APEs is proposed. The efficient use of APEs in clinical practice could mark the beginning of the urgently needed post-antibiotic era, but further trials assessing their efficacy and safety are required.
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Affiliation(s)
- Ernesto Prado Montes de Oca
- Molecular Biology Laboratory, Biosecurity Area, CIATEJ – National Council of Science and Technology, Guadalajara, Jalisco, Mexico
- In silico Laboratory, Pharmaceutical and Medical Biotechnology Unit, CIATEJ – National Council of Science and Technology, Guadalajara, Jalisco, Mexico
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Interleukin 13 exposure enhances vitamin D-mediated expression of the human cathelicidin antimicrobial peptide 18/LL-37 in bronchial epithelial cells. Infect Immun 2012; 80:4485-94. [PMID: 23045480 DOI: 10.1128/iai.06224-11] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Vitamin D is an important regulator of the expression of antimicrobial peptides, and vitamin D deficiency is associated with respiratory infections. Regulating expression of antimicrobial peptides, such as the human cathelicidin antimicrobial peptide 18 (hCAP18)/LL-37, by vitamin D in bronchial epithelial cells requires local conversion of 25(OH)-vitamin D(3) (25D(3)) into its bioactive metabolite, 1,25(OH)(2)-vitamin D(3) (1,25D(3)), by CYP27B1. Low circulating vitamin D levels in childhood asthma are associated with more-severe exacerbations, which are often associated with infections. Atopic asthma is accompanied by Th2-driven inflammation mediated by cytokines such as interleukin 4 (IL-4) and IL-13, and the effect of these cytokines on vitamin D metabolism and hCAP18/LL-37 expression is unknown. Therefore, we investigated this with well-differentiated bronchial epithelial cells. To this end, cells were treated with IL-13 with and without 25D(3), and expression of hCAP18/LL-37, CYP27B1, the 1,25D(3)-inactivating enzyme CYP24A1, and vitamin D receptor was assessed by quantitative PCR. We show that IL-13 enhances the ability of 25D(3) to increase expression of hCAP18/LL-37 and CYP24A1. In addition, exposure to IL-13 resulted in increased CYP27B1 expression, whereas vitamin D receptor (VDR) expression was not significantly affected. The enhancing effect of IL-13 on 25D(3)-mediated expression of hCAP18/LL-37 was further confirmed using SDS-PAGE Western blotting and immunofluorescence staining. In conclusion, we demonstrate that IL-13 induces vitamin D-dependent hCAP18/LL-37 expression, most likely by increasing CYP27B1. These data suggest that Th2 cytokines regulate the vitamin D metabolic pathway in bronchial epithelial cells.
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Thorne-Lyman A, Fawzi WW. Vitamin D during pregnancy and maternal, neonatal and infant health outcomes: a systematic review and meta-analysis. Paediatr Perinat Epidemiol 2012; 26 Suppl 1:75-90. [PMID: 22742603 PMCID: PMC3843348 DOI: 10.1111/j.1365-3016.2012.01283.x] [Citation(s) in RCA: 193] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Vitamin D has well-defined classical functions related to calcium metabolism and bone health but also has non-classical effects that may influence other aspects of health. There has been considerable recent interest in the role of vitamin D on outcomes related to pregnancy and young child health but few efforts have been made to systematically consolidate this evidence to inform the research and policy agenda for low-income countries. A systematic review was undertaken to identify intervention and observational studies of vitamin D supplementation, intake or status (25-hydroxy-vitamin D) during pregnancy on perinatal and infant health outcomes. Data from trials and observational studies isolating the effect of vitamin D supplementation and intake were extracted and study quality was evaluated. Meta-analysis was used to pool effect estimates. We identified five randomised trials with outcomes of relevance to our review. All had small sample size and dosage amount, duration and frequency varied as did the ability to correct deficiency. Pooled analysis of trials using fixed-effects models suggested protective effects of supplementation on low birthweight (three trials, risk ratio (RR) = 0.40 [95% confidence interval (CI) 0.23, 0.71]) and non-significant but suggestive effects of daily supplementation on small-for-gestational age (two trials, RR = 0.67 [0.40, 1.11]). No effect on preterm delivery (<37 weeks) was evident (two trials, RR = 0.77 [0.35, 1.66]). Little evidence from trials exists to evaluate the effect of vitamin D supplementation during pregnancy on maternal, perinatal or infant health outcomes. Based on both trials and observational studies, we recommend that future research explore small-for-gestational age, preterm delivery, pre-eclampsia, and maternal and childhood infections, as outcomes of interest. Trials should focus on populations with a high prevalence of vitamin D deficiency, explore the relevance of timing of supplementation, and the dosage used in such trials should be sufficient to correct deficiency.
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Affiliation(s)
- Andrew Thorne-Lyman
- Department of Nutrition, Harvard School of Public Health, Boston, MA 02115, USA.
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20
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Ghandchi Z, Neyestani TR, Saboor Yaraghi AA, Eshraghian MR, Gharavi A, Shariatzadeh N, Kalayi A, Houshiarrad A. Vitamin D status and the predictors of circulating T helper 1-type immunoglobulin levels in Iranian subjects with type 1 diabetes and their siblings: a case-control study. J Hum Nutr Diet 2012; 25:365-72. [DOI: 10.1111/j.1365-277x.2012.01228.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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High prevalence of vitamin D deficiency in school-age children in Tehran, 2008: a red alert. Public Health Nutr 2011; 15:324-30. [PMID: 21356149 DOI: 10.1017/s1368980011000188] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
OBJECTIVE To assess the vitamin D status of 9-12-year-old primary-school children in Tehran during autumn and winter 2007-2008. DESIGN A descriptive cross-sectional study. SETTING Primary schools of Tehran city, Iran. SUBJECTS A total of 1111 children aged 9-12 years (573 boys and 538 girls) from sixty primary schools were enrolled in the study. Weight, height, BMI and serum levels of Ca, P, Mg, 25-hydroxyvitamin D (25(OH)D), intact parathyroid hormone (iPTH), osteocalcin and bone-specific alkaline phosphatase of all the participants were assessed. Dietary Ca intake was also evaluated using a quantitative FFQ for a subsample of the study population (n 503). Vitamin D sufficiency was defined on the basis of serum levels of 25(OH)D as either ≥37 nmol/l (criterion 1) or ≥50 nmol/l (criterion 2). RESULTS Daily intake of Ca did not differ significantly between boys and girls (929·6 (sd 436·7) mg and 909·5 (sd 465·5) mg, respectively). However, on the basis of the first criterion, approximately 86 % of the children had vitamin D deficiency, with 38·3 % being severely deficient (25(OH)D < 12·5 nmol/l). According to the second criterion, prevalence of vitamin D deficiency rose to 91·7 %. Prevalence of vitamin D deficiency was higher in girls than in boys by either criterion. Serum levels of 25(OH)D inversely correlated with iPTH (r = -0·154, P < 0·001) and BMI (r = -0·092, P = 0·002) but directly correlated with duration of sun exposure (r = 0·115, P < 0·001). CONCLUSIONS The high prevalence of vitamin D deficiency among schoolchildren (especially among girls) warrants immediate interventions for proper nutritional support.
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Selvaraj P. Vitamin D, vitamin D receptor, and cathelicidin in the treatment of tuberculosis. VITAMINS AND HORMONES 2011; 86:307-25. [PMID: 21419277 DOI: 10.1016/b978-0-12-386960-9.00013-7] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Vitamin D plays a major role in bone mineral density and calcium homeostasis. Apart from its classical action, the active form of vitamin D [1,25-dihydroxyvitamin D(3) (1,25(OH)(2)D(3))] influences the innate and adaptive immune functions through vitamin D receptor (VDR) that are present in various cells of the immune system. Vitamin D deficiencies have been associated with development of tuberculosis (TB) disease, caused by Mycobacterium tuberculosis. Vitamin D(3) is shown to enhance macrophage phagocytosis of M. tuberculosis and increases the production of antimicrobial peptide cathelicidin and killing of M. tuberculosis. During the preantibiotic era, exposure to sunlight and supplementation of vitamin D were the methods of choice for treatment of TB. Vitamin D supplementation showed sputum clearance and radiological improvement and reduction in mortality among human immunodeficiency virus (HIV)-infected patients with TB. VDR gene polymorphisms regulate the immunomodulatory effect of vitamin D(3) and are associated with faster sputum conversion during anti-TB treatment. The emerging evidences regarding immunomodulatory properties of vitamin D(3) have rekindled interest in vitamin D as an adjunct to anti-TB therapy. The current review explains the important potential application of vitamin D in enhancing the innate immunity to TB and the role of VDR gene variants on anti-TB treatment.
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Affiliation(s)
- P Selvaraj
- Department of Immunology, Tuberculosis Research Centre, Indian Council of Medical Research, Chennai, India
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Thiem U, Borchhardt K. Vitamin D in solid organ transplantation with special emphasis on kidney transplantation. VITAMINS AND HORMONES 2011; 86:429-68. [PMID: 21419283 DOI: 10.1016/b978-0-12-386960-9.00019-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Within the past decades, vitamin D was identified as having additional physiological functions far beyond calcium homeostasis and bone metabolism. Stimulated by the discovery of the vitamin D receptor in a broad range of tissues as well as the expression of 1α-hydroxylase, the enzyme responsible for the activation of vitamin D, it became evident that the actions of vitamin D are not restricted to cells involved in mineral and bone metabolism. In fact, it affects proliferation, differentiation, and function of a large number of different cell types including cells of the immune system. Vitamin D receptor agonists were found to exert immunosuppressive effects on the adaptive immune system, thus being able to mediate immunologic tolerance. However, they promote the innate immune system and thereby improve the ability of the host to combat invading pathogens. This review summarizes our current understanding of vitamin D as an immunomodulatory agent with special emphasis on its clinical implications in the transplant setting.
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Affiliation(s)
- Ursula Thiem
- Division of Nephrology and Dialysis, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
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Zittermann A, Gummert JF. Nonclassical vitamin D action. Nutrients 2010; 2:408-25. [PMID: 22254030 PMCID: PMC3257656 DOI: 10.3390/nu2040408] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2010] [Revised: 03/17/2010] [Accepted: 03/22/2010] [Indexed: 02/06/2023] Open
Abstract
It is becoming increasingly clear that vitamin D has a broad range of actions in the human body. Besides its well-known effects on calcium/phosphate homeostasis, vitamin D influences muscle function, cardiovascular homeostasis, nervous function, and the immune response. Vitamin D deficiency/insufficiency has been associated with muscle weakness and a high incidence of various chronic diseases such as cardiovascular disease, cancer, multiple sclerosis, and type 1 and 2 diabetes. Most importantly, low vitamin D status has been found to be an independent predictor of all-cause mortality. Several recent randomized controlled trials support the assumption that vitamin D can improve muscle strength, glucose homeostasis, and cardiovascular risk markers. In addition, vitamin D may reduce cancer incidence and elevated blood pressure. Since the prevalence of vitamin D deficiency/insufficiency is high throughout the world, there is a need to improve vitamin D status in the general adult population. However, the currently recommended daily vitamin D intake of 5-15 µg is too low to achieve an adequate vitamin D status in individuals with only modest skin synthesis. Thus, there is a need to recommend a vitamin D intake that is effective for achieving adequate circulating 25-hydroxyvitamin D concentrations (>75 nmol/L).
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Affiliation(s)
- Armin Zittermann
- Clinic for Thoracic and Cardiovascular Surgery, Heart and Diabetes Center North Rhine-Westphalia, Ruhr University Bochum, Georgstrasse 11, 32545 Bad Oeynhausen, Germany.
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