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The pancreas in cystic fibrosis
1Child Health, University of Sheffield, Sheffield Children's Hospital, Western Bank, Sheffield S10 2TH, UK.
Insights
Cystic fibrosis (CF) causes pancreatic exocrine failure, impacting digestion and leading to maldigestion. Pancreatic-sufficient CF patients show milder symptoms and better survival than those with pancreatic insufficiency.
Area of Science:
- Gastroenterology
- Genetics
- Pediatrics
Background:
- Pancreatic exocrine function is crucial for digestion, with defects causing maldigestion and nutrient loss.
- Cystic fibrosis (CF) is a primary cause of childhood pancreatic exocrine failure.
- Adult pancreatic insufficiency is often linked to chronic pancreatitis and alcohol use.
Purpose of the Study:
- To explore the relationship between cystic fibrosis genotypes and pancreatic function.
- To investigate the correlation between pancreatic sufficiency in CF and disease severity.
- To examine the prevalence of CF alleles in adult chronic pancreatitis cases.
Main Methods:
- Correlation analysis of CF genotype with pancreatic function.
- Comparison of clinical outcomes (respiratory disease, survival, sweat chloride) between pancreatic-sufficient (PS) and pancreatic-insufficient (PI) CF patients.
- Epidemiological study on CF allele frequency in chronic pancreatitis cohorts.
Main Results:
- Pancreatic function in CF patients correlates with their specific genotype.
- Pancreatic-sufficient (PS) CF patients exhibit milder respiratory disease, enhanced survival rates, and lower sweat chloride levels compared to PI patients.
- Mutant CF alleles are found more frequently in individuals with chronic pancreatitis, often without typical sino-pulmonary issues or elevated sweat electrolytes.
Conclusions:
- Genotype-phenotype correlations are significant in cystic fibrosis, particularly concerning pancreatic exocrine function.
- Maintaining pancreatic sufficiency in CF is associated with improved overall health outcomes.
- The overlap between CF alleles and chronic pancreatitis suggests a potential shared genetic or etiological component.
Abstract:
The pancreas secretes a bicarbonate-rich fluid containing digestive enzymes via the ampulla of Vater into the duodenum. Defective secretion leads to maldigestion of fat and protein with increased faecal losses. Cystic fibrosis (CF) is the major cause of pancreatic exocrine failure in childhood, whereas pancreatic insufficiency in adults is commonly associated with chronic pancreatitis and alcohol ingestion. In cystic fibrosis, pancreatic function correlates with genotype; pancreatic-sufficient (PS) patients have a milder course of respiratory disease, improved survival and lower mean sweat chloride concentrations than those with pancreatic insufficiency. Recent observations suggest that mutant CF alleles are over-represented in patients with chronic pancreatitis. Few show evidence of sino-pulmonary disease or high sweat electrolyte concentrations.