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Prostaglandin levels are lower in children than adults, but this doesn't explain infant airflow resistance. Mediator release, like histamine, occurs in children, suggesting similar mechanisms across childhood.
Area of Science:
- Pediatric Pulmonology
- Allergy and Immunology
- Biochemistry
Background:
- Prostaglandins (PGF) are implicated in premature infant hyaline membrane disease.
- Investigating prostaglandin E (PGE) levels during growth is crucial for understanding pediatric respiratory conditions.
- Lower PGE levels in children compared to adults do not fully account for infant airflow resistance.
Purpose of the Study:
- To investigate prostaglandin E (PGE) levels in children during growth.
- To explore the role and release of inflammatory mediators in pediatric asthma.
- To compare mediator release and response to allergic stimuli in children and infants.
Main Methods:
- Measurement of prostaglandin levels during growth.
- In vitro studies of histamine release from basophils upon exposure to allergenic extracts.
- Cutaneous tests and respiratory challenges to assess mediator action indirectly.
Main Results:
- Prostaglandin E (PGE) levels are lower in children than in adults.
- Histamine release from basophils was observed in asthmatic children's blood mixed with allergens.
- Mediator action was indirectly demonstrated in children (5-15 years) via tests, but not in infants.
Conclusions:
- While PGE levels differ, they don't explain infant airflow resistance.
- Histamine release is a key mediator mechanism in pediatric asthma.
- Qualitatively similar mediator release mechanisms are likely present in children aged 5-15 years.
Abstract:
Prostaglandins (PGF) are known to occur in premature babies with hyaline membrane disease and so the levels of PGE during growth have been investigated. The levels are lower in children than in adults; but this fact cannot explain the high resistance to air flow in infants. The release of mediators has been shown in children and in adults. Release of histamine from circulating basophils occurs when the suspected allergenic extract is mixed with the blood of the asthmatic child. Other mediators have not been found in young children. Cutaneous tests and respiratory challenges demonstrate indirectly the action of mediators in children, but not in infants. Between 5 and 15 years of age, the frequency and type of response to these tests are not significantly different. One may assume that, at least within these age limits, release of mediators is similar qualitatively.