Abstract:
Background:Salivary alpha-amylase (sAA) and salivary immunoglobulin A (sIgA) have been proposed as biomarkers for research on the mucosal immune system and on stress. Expression of both sAA and sIgA has been described to follow opposing diurnal patterns. This knowledge is crucial for the interpretation of studies using these biomarkers. Aim:It was hypothesized that sAA and sIgA display diurnal patterns in children and that this is independent of food intake or demographic factors. Methods:Whole saliva was collected from 78 healthy children (15-39 months old) in the morning and evening for two random nonconsecutive days. The samples have been analysed for sAA and sIgA. The total daily energy, fat, saturated fat, protein, carbohydrate and fibre, mineral, and vitamin consumption were analysed based on the two-day weighed food records collected by the parents. Results:It was demonstrated that most young children followed the diurnal pattern when sAA increased and sIgA decreased from morning to evening. No correlation was observed between the intake of any of the nutrients and morning or evening values for both salivary proteins. The morning and evening values of sAA and sIgA did not correlate with age, sex, Asian ethnicity, and BMI of the children. Conclusion:Diurnal patterns of sAA and sIgA exist in healthy young children and are not affected by their nutrient intake, sex, Asian ethnicity, and BMI. Scientists including sIgA and sAA in their research must consider the diurnal pattern that these markers exhibit and design the study accordingly.
journal_name
Biomed Res Intjournal_title
BioMed research internationalauthors
Lim PW,Nambiar S,Muhardi L,Abdul Kader UH,Garssen J,Sandalova Edoi
10.1155/2019/3687416subject
Has Abstractpub_date
2019-01-14 00:00:00pages
3687416eissn
2314-6133issn
2314-6141journal_volume
2019pub_type
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