Abstract:
OBJECTIVE:We hypothesized that patients with cystic fibrosis (CF) have higher rates of protein breakdown than normal volunteers and that the infusion of insulin would result in less suppression of proteolysis. Methods. Using [1-C]leucine and a three-step hyperinsulinemic euglycemic clamp, we measured rates of leucine appearance in 29 adult CF patients and 18 matched-control volunteers. The CF patients were characterized by oral glucose tolerance testing and clinical status scoring. RESULTS:The CF patients had significantly increased proteolysis when compared with that of controls (CF, 123 +/- 28 micromol/kg/h; controls, 71 +/- 15 micromol/kg/h) and rates of proteolysis were significantly different between CF patients with impaired glucose tolerance and diabetes and those CF patients with normal glucose tolerance. Suppression of proteolysis by insulin was less in all CF subgroups than in the controls at peripheral insulin levels of 16 and 29 microU/mL. At peripheral insulin levels of 100 microU/mL, there was no difference in insulin suppression of proteolysis between CF patients and controls. Importantly, basal rates of proteolysis had an inverse relationship with clinical status in CF patients (r = -.76). CONCLUSIONS:Our findings indicate that proteolysis is higher in adult CF patients than in controls and that CF patients exhibit resistance to the anabolic effects of insulin on proteolysis. Most significantly, our findings indicate that basal rates of proteolysis inversely correlate with clinical status in CF.
journal_name
Pediatricsjournal_title
Pediatricsauthors
Hardin DS,LeBlanc A,Lukenbaugh S,Para L,Seilheimer DKdoi
10.1542/peds.101.3.433subject
Has Abstractpub_date
1998-03-01 00:00:00pages
433-7issue
3 Pt 1eissn
0031-4005issn
1098-4275journal_volume
101pub_type
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