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Decreased Fc and complement receptors on the phagocytes of asthmatic children
Insights
Asthmatic children show reduced immune cell receptors for immunoglobulins and complement. Allergen exposure further decreases these receptors on polymorphonuclear cells, impacting immune response in asthma.
Area of Science:
- Immunology
- Allergy Research
- Cell Biology
Background:
- Immune cell surface receptors play a crucial role in host defense.
- Polymorphonuclear (PMN) and mononuclear phagocytes utilize Fc and complement receptors for immune functions.
- Dysregulation of these receptors is implicated in various inflammatory conditions, including asthma.
Purpose of the Study:
- To investigate the expression of Fc and complement receptors on immune cells in asthmatic children.
- To compare receptor levels between asthmatic children and healthy controls.
- To assess the impact of allergen exposure on these receptors in allergic individuals.
Main Methods:
- Studied Fc and complement receptors on PMN and mononuclear phagocytes.
- Utilized erythrocyte-antibody (EA) complexes for Fc receptor detection.
- Employed erythrocyte-antibody-complement (EAC) complexes for complement receptor detection.
- Compared receptor percentages in 57 asthmatic children and 23 normal controls.
- Assessed receptor changes after in vitro allergen incubation in allergic patients.
Main Results:
- Asthmatic children exhibited significantly lower mean percentages of PMN and monocytes with Fc and complement receptors compared to normal controls.
- In allergic patients, the number of PMN with Fc and complement receptors significantly decreased following allergen incubation.
- These findings suggest a potential impairment in immune cell receptor function in pediatric asthma.
Conclusions:
- Pediatric asthma is associated with reduced Fc and complement receptor expression on key immune cells.
- Allergen challenge exacerbates this reduction, highlighting a potential mechanism in allergic asthma.
- Further research is warranted to explore therapeutic strategies targeting these receptor pathways.
Abstract:
Surface receptors of polymorphonuclear (PMN) and mononuclear phagocytes for Fc portions of immunoglobulins and complement were studied in 57 asthmatic children and 23 normal controls. Erythrocyte-antibody complexes (EA) were used to detect the Fc receptors and erythrocyte-antibody-complement complexes (EAC) to detect complement receptors. Both the mean percentages of PMN and monocyte with Fc and complement receptors of asthmatic children were significantly lower than those of normals. Moreover, in allergic patients both the numbers of PMN with Fc and complement receptors decreased significantly after incubation with allergen.