Abstract
Background
l-Glutamine (l-GLN) is the most abundant amino acid in the human body. In hypercatabolic conditions, supplementation with l-GLN improves immunological function. Among the immune cells, the lymphocytes are the largest consumers of l-GLN in a catabolic disease state. Here, we evaluated the effect of l-GLN treatment on the expression of T and B cell surface molecules and secreted cytokines in cultured peripheral blood of healthy subjects.
Methods
Peripheral blood samples (N = 14) were cultured with or without l-GLN treatment and immunostained for T (anti-CD45, anti-CD3, anti-CD4, anti-CD8) and B (anti-CD19 and anti-CD20) lymphocytes at different time points over 24 h. In addition, secreted cytokines IL1-β, IL-6, IL-8, IL-10, IL-12p70, and TNF were measured at the same period with cytometric bead array.
Results
Our data showed that CD45 expression increased after 18 h in the l-GLN treatment group. On the other hand, l-GLN decreased the expression of total (CD3+) and helper (CD3+CD4+) T cells within 24 h, reducing the expression of cytotoxic cell markers (CD3+CD8+) at 12 and 18 h and of B cells (CD19+ and CD20+) at 18 h. Also, IL-1β and IL-10 cytokines increased at 18 and 24 h in the l-GLN treatment group supernatant of cultured peripheral blood.
Conclusions
The main finding of this study is that in vitro treatment with l-GLN can modulate the expression of T and B lymphocytes surface molecules and increase the secretion of IL-1β and IL-10 after 24 h.
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Data availability
Only if you give prior notice to the corresponding author. The datasets generated during and/or analyzed during the current study are available.
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Funding
This study was funded by the Laboratory of Immunology and Molecular Biology-Federal University of Bahia and enteral and Parenteral Nutrition Service of Hospital Santa Izabel-BA. NEVES-AMORIM, EG; SANTOS, S. Q and ARAÚJO-PEREIRA, M received Research grants the Federal University of Bahia.
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Neves-Amorim, E. G.: formal analysis, investigation, writing-original draft; Santos, S. Q.: investigation; Araújo-Pereira, M.: investigation; Santana, Z. V. B.: investigation; Bomfim, E. K. S: investigation; Chagas, N. M. B. L.: investigation; Conceição, R. R.: investigation; Freire, M. D. M.: general analyses, review and editing; Torres, A. J. L.: formal analysis, conceptualization, writing-review and editing; Fortuna, V.: formal analysis, conceptualization, writing-review and editing; Carvalho, G. C.: formal analysis, conceptualization, writing-review and editing; Meyer, J. R.: conceptualization, resources; Freire, S. M.: conceptualization, methodology, supervision, project administration, resources, funding acquisition, writing-review and editing; Freire, A. N. M.: conceptualization, methodology, project administration, funding acquisition, resources.
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This study was performed in line with the principles of the Declaration of Helsinki. The institutional review board of the Bahiana School of Medicine and Public Health (CAAE:57274316.3.0000.5544) approved this study.
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Informed consent was obtained from all individual participants included in the study.
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Neves-Amorim, E.G., Santos, S.Q., Araújo-Pereira, M. et al. Effect of l-Glutamine treatment on the expression of T and B cell surface molecules and secreted cytokines by cultured peripheral blood of healthy subjects. Nutrire 47, 19 (2022). https://doi.org/10.1186/s41110-022-00169-5
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DOI: https://doi.org/10.1186/s41110-022-00169-5