Elevated urinary plasmin activity resistant to alpha2-antiplasmin in acute poststreptococcal glomerulonephritis.
Nephrol Dial Transplant
; 23(7): 2254-9, 2008 Jul.
Article
em En
| MEDLINE
| ID: mdl-18223261
ABSTRACT
BACKGROUND:
A pathogenic role of intraglomerular plasmin bound to nephritogenic antigen (nephritis-associated plasmin receptor, NAPlr) and resistant to physiologic inhibitors such as alpha(2)-antiplasmin (alpha(2)-AP) has recently been proposed in acute poststreptococcal glomerulonephritis (APSGN). To confirm this concept, we analysed the urinary profile of plasmin cascade in APSGN patients.METHODS:
Urine samples from 10 patients with APSGN, 12 patients with IgA nephropathy (IgAN), 10 patients with streptococcal infection without nephritis (SI) and 10 healthy control subjects were analysed. The alpha(2)-AP-resistant plasmin activity was assessed by a chromogenic assay after alpha(2)-AP was added to each urine sample. Urinary plasminogen activator (PA) and plasmin were further analysed by polyacrylamide gel zymography. Urinary NAPlr was assessed by western blot analysis in selected samples.RESULTS:
Urinary alpha(2)-AP-resistant plasmin activity corrected for creatinine concentration (units/g x creatinine) was significantly higher in patients with APSGN (2.99 +/- 0.63) than in patients with IgAN (1.02 +/- 0.20, P < 0.01), SI (0.79 +/- 0.17, P < 0.01), or in healthy control subjects (0.73 +/- 0.18, P < 0.01). This tendency was confirmed by casein gel zymography. However urinary PA activity assessed by plasminogen-casein gel zymography did not differ between groups. NAPlr was detected in the urine of APSGN patients.CONCLUSIONS:
We found elevated urinary plasmin activity resistant to alpha(2)-AP, which may be due to urinary excretion of NAPlr in patients with APSGN. This result supports the pathogenic role of the NAPlr-plasmin complex in the development of APSGN. Furthermore, alpha(2)-AP-resistant urinary plasmin activity may be useful as a diagnostic marker for APSGN.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Infecções Estreptocócicas
/
Alfa 2-Antiplasmina
/
Fibrinolisina
/
Glomerulonefrite
Tipo de estudo:
Diagnostic_studies
/
Observational_studies
/
Risk_factors_studies
Limite:
Adolescent
/
Adult
/
Child
/
Child, preschool
/
Humans
/
Middle aged
Idioma:
En
Revista:
Nephrol Dial Transplant
Assunto da revista:
NEFROLOGIA
/
TRANSPLANTE
Ano de publicação:
2008
Tipo de documento:
Article
País de afiliação:
Japão