Vitamin A deficiency promotes bronchial hyperreactivity  in rats by altering muscarinic M2 receptor function

Vitamin A deficiency (VAD) remains an important health problem among children in developing countries. Children living in these areas have a higher mortality from respiratory infections, which likely results in part from suboptimal nutrition, including VAD. Bronchial hyperreactivity can follow viral respiratory infections and may complicate the recovery. To investigate whether VAD promotes bronchial hyperreactivity, we have assessed methacholine-induced bronchoconstriction in VAD and vitamin A-sufficient rats. Bronchial constriction developed at lower concentrations of inhaled methacholine in VAD than in vitamin A-sufficient rats. This did not result from an increase in the bronchial wall thickness or the clearance of a small molecule (with a size similar to methacholine) from the air space. The function and abundance of the muscarinic M2 receptors in bronchial tissue were reduced in VAD rats, suggesting that this receptor may contribute to these animals' diminished ability to limit cholinergic-mediated bronchoconstriction. A similar reduction in muscarinic M2 receptor function has been observed in asthma. Vitamin A (retinol) and its congeners (retinoids) may be required to regulate bronchial responsiveness in addition to maintaining a normal bronchial epithelium.

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Vitamin A Supplementation and Child Morbidity and Mortality in Developing Countries

Food and Nutrition Bulletin ◽

10.1177/156482659401500414 ◽

1994 ◽

Vol 15 (4) ◽

pp. 1-9 ◽

Cited By ~ 27

Author(s):

George H. Beaton ◽

Reynaldo Martorell ◽

Kristan A. Aronson ◽

Barry Edmonston ◽

George McCabe. A. Catharine Ross ◽

...

Keyword(s):

Vitamin A ◽

Respiratory Infections ◽

Vitamin A Deficiency ◽

Meta Analysis ◽

Clinical Signs ◽

Vitamin A Status ◽

Child Morbidity ◽

Age Profile ◽

Mortality Trials ◽

Low Prevalence

A meta-analysis of eight mortality trials indicates that improving the vitamin A status of children aged six months to five years reduced mortality rates by about 23% in populations with at least low prevalence of clinical signs of vitamin A deficiency. The observed effect of supplementation, described in terms of relative risk (RR), was RR =0.77 (95% confidence interval 0.68–0.88; p < .001) and did not differ by sex or age. However, the number of lives saved was greater at younger ages because of higher mortality. A significant RR was shown for deaths attributed to diarrhoea and measles, but not for respiratory infection. Variability among the trials in effects was apparent, but attempts to explain it by descriptors of the population (baseline anthropometric status, prevalence of xerophthalmia, age profile, baseline mortality) were unsuccessful. Owing to the lack of data, firm conclusions could not be reached about effectiveness in children of less than six months and in settings where biochemical but not clinical evidence of vitamin A deficiency exists. Information about morbidity outcomes from about two dozen studies was reviewed. No consistent effects on frequency or prevalence of diarrhoeal and respiratory infections were found. Improvement in vitamin A status did appear to reduce severe morbidity, particularly in children with measles.

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Risk Factors for Acute Respiratory Infections (ARI) Among Under-five Children in Bangladesh

Journal of Scientific Research ◽

10.3329/jsr.v1i1.1055 ◽

2008 ◽

Vol 1 (1) ◽

pp. 72-81 ◽

Cited By ~ 10

Author(s):

Kazi Md. Abul Kalam Azad

Keyword(s):

Risk Factors ◽

Vitamin A ◽

Adolescent Mothers ◽

Home Visiting ◽

Respiratory Infections ◽

Vitamin A Deficiency ◽

Significant Risk ◽

Childhood Mortality ◽

Acute Respiratory Infections ◽

Mortality And Morbidity

Acute respiratory infection (ARI) is a major cause of childhood mortality and morbidity in Bangladesh. The aim of this study is to identify the significant risk factors for ARI in children less than five years of age. The data in this study comes from Bangladesh Demographic and Health Survey (BDHS) 2004. In this study, a child was considered as having experienced ARI if she or he had cough in the last two weeks preceding the survey with any one of the three symptoms of short but rapid breathing, difficulty of breathing or labored inspiration. Logistic regression was used on various independent variables to find the risk factors. Results showed that child's age, sex, body weight and Vitamin A deficiency were correlated with prevalence of ARI. Additionally mother's characteristics like age, malnutrition, education level, and family's socio-economic status were found to be associated. Recommendations include more specific knowledge of ARI to adolescent mothers from the lowest wealth quintile. A community service which could include home visiting for health education, supplementation of vitamin A, and advice would be an advantage if provided for poor or teenaged pregnant women. This in turn would reduce low birth weight incidence, and subsequently reduce incidence of ARI among these children.Keywords: Acute respiratory infections (ARI); Risk factors; Infant; Child under 5 years; Bangladesh.© 2009 JSR Publications. ISSN: 2070-0237(Print); 2037-0245 (Online). All rights reserved.DOI: 10.3329/jsr.v1i1.1055

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Retinoic acid reverses the airway hyperresponsiveness but not the parenchymal defect that is associated with vitamin A deficiency

AJP Lung Cellular and Molecular Physiology ◽

10.1152/ajplung.00158.2003 ◽

2004 ◽

Vol 286 (2) ◽

pp. L437-L444 ◽

Cited By ~ 18

Author(s):

Stephen E. McGowan ◽

Amey Jo Holmes ◽

Jennifer Smith

Keyword(s):

Retinoic Acid ◽

Vitamin A ◽

Airway Hyperresponsiveness ◽

Vitamin A Deficiency ◽

Elastic Fibers ◽

Bronchial Wall ◽

Trans Retinoic Acid ◽

All Trans Retinoic Acid ◽

Airway Caliber ◽

And Function

Airway hyperresponsiveness (AHR) is influenced by structural components of the bronchial wall, including the smooth muscle and connective tissue elements and the neuromuscular function. AHR is also influenced by parenchymally derived tethering forces on the bronchial wall, which maintain airway caliber by producing outward radial traction. Our previous work has shown that vitamin A-deficient (VAD) rats exhibit cholinergic hyperresponsiveness and a decrease in the expression and function of the muscarinic-2 receptors (M2R). We hypothesized that if decreases in radial traction from airway or parenchymal structures contributed to the VAD-related increase in AHR, then the radial traction would normalize more slowly than VAD-related alterations in neurotransmitter signaling. Rats remained vitamin A sufficient (VAS) or were rendered VAD and then maintained on the VAD diet in the presence or absence of supplementation with all- trans retinoic acid (RA). VAD was associated with an approximately twofold increase in respiratory resistance and elastance compared with VAS rats. Exposure to RA for 12 days but not 4 days restored resistance and elastance to control (VAS) levels. In VAD rats, AHR was accompanied by decreases in bronchial M2R gene expression and function, which were restored after 12 days of RA supplementation. Subepithelial bronchial elastic fibers were decreased by ∼50% in VAD rats and were significantly restored by RA. The increase in AHR that is associated with VAD is accompanied by decreases in M2R expression and function that can be restored by RA and a reduction in airway elastic fibers that can be partially restored by RA.

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Efek suplementasi vitamin A pada ibu nifas terhadap pertumbuhan bayi umur 0-4 bulan

Jurnal Gizi Klinik Indonesia ◽

10.22146/ijcn.15440 ◽

2013 ◽

Vol 9 (3) ◽

pp. 97

Author(s):

Abdullah Abdullah ◽

Endy Paryanto Prawirohartono ◽

Siti Helmyati

Keyword(s):

Tract Infection ◽

Vitamin A ◽

Respiratory Tract ◽

Respiratory Tract Infection ◽

Respiratory Infections ◽

Vitamin A Deficiency ◽

Controlled Trial ◽

Acute Respiratory Tract Infection ◽

Vitamin A Supplementation ◽

Education Group

Background: Vitamin A deficiency is a nutritional problem in infants since breastmilk insufficiently contains vitamin A. Therefore it is necessary to study the effect of vitamin A supplementation to mothers at parturition period on growth and morbidities of infants at 0-4 months of age.Objective: To identify the effect of vitamin A supplementation to mothers at parturition period on growth and morbidities of infants at 0-4 months of age.Method: We conducted a randomized controlled trial from March-July 2009 at Province of Lampung. We recruited 90 mothers that were grouped into vitamin A supplementation group and socialization about vitamin A group during parturition period. The outcomes of this study were growth in WHZ and morbidities of infants at 0-4 months of age measured as duration of acute diarrhea and upper respiratory infections. Statistical analysis was performed by using Chi-Square and t-test.Results: The growth of infants of 0-4 months from vitamin A supplemented mothers was not significantly different from the socialization group. Duration of diarrhea and acute respiratory tract infection of infants from supplemented mothers at parturition period was significantly shorter than of infants from socialization group.Conclusion: The growth of infant at 0-4 months of age from vitamin A supplemented mothers at parturition period were not significantly different from those who were from education group. Duration of diarrhea and acute respiratory tract infection of infants from vitamin A supplemented mothers at parturition period were shorter than those who were from education group.

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Neonatal Vitamin A Deficiency and Its Impact on Acute Respiratory Infections among Preschool Inuit Children

Can J Public Health ◽

10.1007/bf03405454 ◽

2008 ◽

Vol 99 (2) ◽

pp. 102-106 ◽

Cited By ~ 9

Author(s):

Cynthia Cameron ◽

Frédéric Dallaire ◽

Carole Vézina ◽

Gina Muckle ◽

Suzanne Bruneau ◽

...

Keyword(s):

Vitamin A ◽

Respiratory Infections ◽

Vitamin A Deficiency ◽

Acute Respiratory Infections

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Vitamin A deficiency impairs the immune response to intranasal vaccination and RSV infection in neonatal calves

Scientific Reports ◽

10.1038/s41598-019-51684-x ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 13

Author(s):

Jodi L. McGill ◽

Sean M. Kelly ◽

Mariana Guerra-Maupome ◽

Emma Winkley ◽

Jamie Henningson ◽

...

Keyword(s):

Immune Response ◽

Vitamin A ◽

Respiratory Tract ◽

Lower Respiratory Tract ◽

Respiratory Infections ◽

Vitamin A Deficiency ◽

Significant Risk ◽

Rsv Infection ◽

Syncytial Virus ◽

The Impact

Abstract Respiratory syncytial virus (RSV) infection is a leading cause of severe acute lower respiratory tract infection in infants and children worldwide. Vitamin A deficiency (VAD) is one of the most prevalent nutrition-related health problems in the world and is a significant risk factor in the development of severe respiratory infections in infants and young children. Bovine RSV (BRSV) is a primary cause of lower respiratory tract disease in young cattle. The calf model of BRSV infection is useful to understand the immune response to human RSV infection. We have previously developed an amphiphilic polyanhydride nanoparticle (NP)-based vaccine (i.e., nanovaccine) encapsulating the fusion and attachment proteins from BRSV (BRSV-NP). Calves receiving a single, intranasal dose of the BRSV-NP vaccine are partially protected from BRSV challenge. Here, we evaluated the impact of VAD on the immune response to the BRSV-NP vaccine and subsequent challenge with BRSV. Our results show that VAD calves are unable to respond to the mucosal BRSV-NP vaccine, are afforded no protection from BRSV challenge and have significant abnormalities in the inflammatory response in the infected lung. We further show that acute BRSV infection negatively impacts serum and liver retinol, rendering even well-nourished individuals susceptible to VAD. Our results support the use of the calf model for elucidating the impact of nutritional status on mucosal immunity and respiratory viral infection in infants and underline the importance of VA in regulating immunity in the respiratory mucosa.

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Quantification of Vitamin A in Fortified Rapeseed, Groundnut and Soya Oils Using a Simple Portable Device: Comparison to High Performance Liquid Chromatography

International Journal for Vitamin and Nutrition Research ◽

10.1024/0300-9831/a000154 ◽

2013 ◽

Vol 83 (2) ◽

pp. 122-128 ◽

Cited By ~ 4

Author(s):

Cécile Renaud ◽

Jacques Berger ◽

Arnaud Laillou ◽

Sylvie Avallone

Keyword(s):

High Performance Liquid Chromatography ◽

Liquid Chromatography ◽

Vitamin A ◽

High Performance ◽

Vitamin A Deficiency ◽

Developed Countries ◽

Portable Device ◽

Least Developed Countries ◽

Control Food ◽

Assay Precision

Vitamin A deficiency is still one of the major public health problems in least developed countries. Fortification of vegetable oils is a strategy implemented worldwide to prevent this deficiency. For a fortification program to be effective, regular monitoring is necessary to control food quality in the producing units. The reference methods for vitamin A quantification are expensive and time-consuming. A rapid method should be useful for regular assessment of vitamin A in the oil industry. A portable device was compared to high-performance liquid chromatography (HPLC) for three plant oils (rapeseed, groundnut, and soya). The device presented a good linearity from 3 to 30 mg retinol equivalents per kg (mg RE.kg- 1). Its limits of detection and quantification were 3 mg RE.kg- 1 for groundnut and rapeseed oils and 4 mg RE.kg- 1 for soya oil. The intra-assay precision ranged from 1.48 % to 3.98 %, considered satisfactory. Accuracy estimated by the root mean squares error ranged from 3.99 to 5.49 and revealed a lower precision than HPLC (0.4 to 2.25). Although it offers less precision than HPLC, the device estimates quickly the vitamin A content of the tested oils from 3 or 4 to 15 mg RE.kg- 1.

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Research Recommendations for Applying Vitamin A-Labelled Isotope Dilution Techniques to Improve Human Vitamin A Nutrition

International Journal for Vitamin and Nutrition Research ◽

10.1024/0300-9831/a000185 ◽

2014 ◽

Vol 84 (Supplement 1) ◽

pp. 52-59 ◽

Cited By ~ 5

Author(s):

Sherry A. Tanumihardjo ◽

Anura V. Kurpad ◽

Janet R. Hunt

Keyword(s):

Public Health ◽

Vitamin A ◽

Vitamin A Deficiency ◽

Human Subjects ◽

The Body ◽

Pool Size ◽

Serum Retinol ◽

Vitamin A Status ◽

Status Assessment ◽

Total Body

The current use of serum retinol concentrations as a measurement of subclinical vitamin A deficiency is unsatisfactory for many reasons. The best technique available for vitamin A status assessment in humans is the measurement of total body pool size. Pool size is measured by the administration of retinol labelled with stable isotopes of carbon or hydrogen that are safe for human subjects, with subsequent measurement of the dilution of the labelled retinol within the body pool. However, the isotope techniques are time-consuming, technically challenging, and relatively expensive. There is also a need to assess different types of tracers and doses, and to establish clear guidelines for the use and interpretation of this method in different populations. Field-friendly improvements are desirable to encourage the application of this technique in developing countries where the need is greatest for monitoring the risk of vitamin A deficiency, the effectiveness of public health interventions, and the potential of hypervitaminosis due to combined supplement and fortification programs. These techniques should be applied to validate other less technical methods of assessing vitamin A deficiency. Another area of public health relevance for this technique is to understand the bioconversion of β-carotene to vitamin A, and its relation to existing vitamin A status, for future dietary diversification programs.

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Vitamin A deficiency is associated with disease severity in patients with liver cirrhosis

10.1055/s-0039-3402154 ◽

2020 ◽

Author(s):

M Nagel ◽

C Labenz ◽

M Nguyen-Tat ◽

N Cabezas Wallscheid ◽

C Czauderna ◽

...

Keyword(s):

Liver Cirrhosis ◽

Vitamin A ◽

Disease Severity ◽

Vitamin A Deficiency

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Mitral Valve Replacement in an Adult with Left Pulmonary Agenesis

The Heart Surgery Forum ◽

10.1532/hsf.1311 ◽

2015 ◽

Vol 18 (3) ◽

pp. 109

Author(s):

Huseyin Saskin ◽

Mustafa Idiz ◽

Cagri Duzyol ◽

Huseyin Macika ◽

Rezan Aksoy

Keyword(s):

Mitral Valve ◽

Vitamin A ◽

Valve Replacement ◽

Viral Infections ◽

Vitamin A Deficiency ◽

Pulmonary Agenesis ◽

Pulmonary Vessels ◽

Live Births ◽

Factors Associated ◽

Female Predominance

Pulmonary agenesis is associated with the absence of pulmonary vessels, bronchi, or parenchyma. This condition usually occurs between the 4th and 5th week of gestation during the embryonic phase. Etiopathogenic factors associated with pulmonary agenesis are not fully understood. In the literature, genetic and teratogenic factors, viral infections, and vitamin-A deficiency are shown to be associated with pulmonary agenesis [Malcon 2012]. This condition may be seen unilaterally or bilaterally. Although the precise rate of incidence is unknown, it is estimated to occur in one of every 10,000 to 12,000 live births [Yetim 2011]. There is a 1.3:1 female predominance with unilateral agenesis [Halilbasic 2013]

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