title: Correlations between plasminogen activator inhibitor-1 and peritoneal transport in pediatric CCPD patients.
abstract: OBJECTIVE
  Plasminogen activator inhibitor-1 (PAI-1) is an important regulator of plasminogen activators and has been shown to be involved in the accumulation of extracellular matrix (ECM) in various tissues. Since peritoneal ECM is a resistance site for peritoneal transport, the production and release of PAI-1 in the peritoneum may affect the peritoneal transport of water and small solutes.
  
  
  METHODS
  The linear correlations between the dialysate PAI-1 levels and the variables of peritoneal transport during peritoneal equilibration tests (PET) were examined.
  
  
  METHODS
  A tertiary university hospital.
  
  
  METHODS
  Six stable pediatric patients (age 10.8 +/- 4 years) undergoing continuous cycler-assisted peritoneal dialysis were included.
  
  
  METHODS
  None.
  
  
  RESULTS
  All data are mean +/- SD. There was a positive correlation between the infused volume and the net ultrafiltration (UF, 198 +/- 127 mL, r = 0.82, p < 0.05). The dialysate PAI-1 levels increased during the dwell time (2.44 +/- 2.23 ng/mL or 2.46 +/- 1.72 micrograms at 4 hours vs 0.04 +/- 0.1 ng/mL or 0.04 +/- 0.09 micrograms at 0 hour, p < 0.05). The saturation indices (dialysate/plasma ratio) of PAI-1 and albumin at 4 hours were 1.05 +/- 1.21 and 0.028 +/- 0.004, respectively. The changes from 0 hour dwell to 4 hour dwell in the dialysate PAI-1 concentration (PAI4-0, 2.4 +/- 2.2 ng/mL) or amount corrected to body surface area (APAI4-0/BSA, 2.61 +/- 2.11 micrograms/m2) negatively correlated with UF or UF/body surface area and positively correlated with the number of episodes of peritonitis. There was no correlation between PAI4-0,APAI4-0/BSA, or plasma PAI-1 concentration and the mass transfer coefficient and clearance of either urea or creatinine.
  
  
  CONCLUSIONS
  The elevated PAI-1 level during the PET was likely from the local production and release of PAI-1. It had an inverse relationship with the amount of ultrafiltration. Repeated inflammation of the peritoneum was associated with an increased production and release of PAI-1 into the peritoneum.
authors.affiliation: Department of Pediatrics, State University of New York at Stony Brook, USA.
authors.forename: J J
authors.initials: JJ
authors.lastname: Lin
authors.forename: K
authors.initials: K
authors.lastname: Singhal
authors.forename: L
authors.initials: L
authors.lastname: Parton
authors.forename: C
authors.initials: C
authors.lastname: Cascio
authors.forename: C S
authors.initials: CS
authors.lastname: Patlak
authors.forename: C L
authors.initials: CL
authors.lastname: Stewart
mesh_terms: D000293:Adolescent; D001692:Biological Transport; D001830:Body Surface Area; D001834:Body Water / Q000378:metabolism; D002648:Child; D002675:Child, Preschool; D003404:Creatinine / Q000097:blood; D015314:Dialysis Solutions / Q000032:analysis; D004351:Drug Resistance; D005109:Extracellular Matrix / Q000378:metabolism; D006440:Hemofiltration; D006801:Humans; D010531:Peritoneal Dialysis, Continuous Ambulatory / Q000009:adverse effects / Q000379:methods; D010537:Peritoneum / Q000378:metabolism*; D010538:Peritonitis / Q000209:etiology / Q000378:metabolism; D017395:Plasminogen Activator Inhibitor 1 / Q000032:analysis / Q000097:blood / Q000378:metabolism*; D015842:Serine Proteinase Inhibitors / Q000032:analysis / Q000097:blood / Q000378:metabolism*; D012709:Serum Albumin / Q000032:analysis; D014508:Urea / Q000097:blood
chemical_list: D015314:Dialysis Solutions; D017395:Plasminogen Activator Inhibitor 1; D015842:Serine Proteinase Inhibitors; D012709:Serum Albumin; D014508:Urea; D003404:Creatinine