Related Experiment Videos
CD45RA and CD45RO isoforms in infected malnourished and infected well-nourished children
O Nájera1, C González, G Toledo
1Universidad Autónoma Metropolitana-Xochimilco, Departamento de Atención a la Salud, Coyoacán, México, D. F. México.
Insights
Malnourished infected children exhibit altered T-cell distributions, with fewer memory cells and more intermediate CD45 isoform cells compared to well-nourished infected children, indicating potential immunodeficiency.
Area of Science:
- Immunology
- Pediatric Infectious Diseases
- Nutritional Immunology
Background:
- Childhood malnutrition is a significant global health issue, often associated with impaired immune function.
- Understanding immune cell dynamics in malnourished children is crucial for addressing infection susceptibility and severity.
- T-lymphocyte subsets, defined by CD45 isoforms, play critical roles in adaptive immunity.
Purpose of the Study:
- To investigate differences in the in vivo distribution of naive, intermediate (Ddull), and memory CD4+ T-lymphocyte subsets.
- To compare these distributions between malnourished infected, well-nourished infected, and well-nourished uninfected children.
Main Methods:
- Flow cytometry was used to analyze the expression of CD45RA (naive) and CD45RO (memory) antigens on CD4+ lymphocytes.
- A prospective cohort study included 15 malnourished infected, 12 well-nourished infected, and 10 well-nourished uninfected children.
Main Results:
- Malnourished infected children had significantly higher proportions of Ddull cells (11.4%) and lower proportions of memory cells (20.3%) compared to well-nourished infected children (8.8% Ddull, 28.1% memory).
- Well-nourished infected children showed an expected increase in memory cells, indicative of an immune response to infection.
Conclusions:
- Malnutrition in infected children is associated with an abnormal distribution of CD4+ T-cell subsets, characterized by increased intermediate cells and reduced memory cells.
- Impaired switching between CD45 isoforms in malnourished children may underlie these observed immune cell alterations.
- These findings suggest a potential mechanism contributing to immunodeficiency in malnourished children, impacting their ability to fight infections.
Abstract:
The aim of this study was to determine if the distribution in vivo of CD4(+)CD45RA(+)/CD45RO(-) (naive), CD4(+)CD45RA(+)/CD45RO(+) (Ddull) and CD4(+)CD45RO(+) (memory) lymphocytes differs in malnourished infected and well-nourished infected children. The expression of CD45RA (naive) and CD45RO (memory) antigens on CD4(+) lymphocytes was analysed by flow cytometry in a prospectively followed cohort of 15 malnourished infected, 12 well-nourished infected and 10 well-nourished uninfected children. Malnourished infected children showed higher fractions of Ddull cells (11.4 +/- 0.7%) and lower fractions of memory cells (20.3 +/- 1.7%) than the well-nourished infected group (8.8 +/- 0.8 and 28.1 +/- 1.8%, respectively). Well-nourished infected children showed increased percentages of memory cells, an expected response to infection. Impairment of the transition switch to the CD45 isoforms in malnourished children may explain these findings, and may be one of the mechanisms involved in immunodeficiency in these children.