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Altered polyamine metabolism in cystic fibrosis
Insights
Children with cystic fibrosis show altered polyamine excretion. Patients excrete more putrescine, spermidine, and spermine, with reduced [14C]spermidine clearance, indicating metabolic differences.
Area of Science:
- Biochemistry
- Genetics
- Pediatrics
Background:
- Cystic fibrosis (CF) is a genetic disorder affecting multiple organs.
- Polyamines are crucial for cell growth and function.
- Altered polyamine metabolism may be linked to CF pathology.
Purpose of the Study:
- To investigate urinary polyamine levels in children with cystic fibrosis.
- To assess polyamine metabolism and excretion in CF patients.
- To correlate polyamine levels with cystic fibrosis disease severity.
Main Methods:
- Quantification of urinary putrescine, spermidine, and spermine.
- Administration of radiolabeled [14C]spermidine to track excretion.
- Correlation analysis with the National Institutes of Health (NIH) clinical score.
Main Results:
- Elevated urinary levels of putrescine, spermidine, and spermine were observed in CF patients.
- CF patients showed significantly reduced excretion of [14C]spermidine compared to controls.
- Urinary spermine correlated positively with CF pathology (NIH score), while putrescine and spermidine correlated negatively.
Conclusions:
- Urinary polyamine profiles differ significantly in children with cystic fibrosis.
- Impaired polyamine metabolism and excretion are characteristic of CF.
- Urinary polyamine levels may serve as potential biomarkers for CF disease severity.
Abstract:
Children with cystic fibrosis excreted elevated urinary levels of all three polyamines--putrescine, spermidine, and spermine. Heterozygote parents excreted intermediate concentrations of the polyamines, but not levels significantly different from levels in normal controls. Patients with cystic fibrosis who were administered a tracer amount of [14C]spermidine excreted 11--13% of the radiolabel within 72 hr whereas normal controls excreted 60--76% of the radiolabel within 72 hr. Spermine excretion was positively correlated with increased pathology as assessed by the National Institutes of Health (NIH) clinical score, whereas urinary putrescine and spermidine levels were negatively correlated with increased pathology.