Elastase mediates the release of growth factors from lung in vivo.
Uncontrolled elastase activity is involved in the development of several types of lung disease. Previous reports demonstrated that growth factors are liberated from pulmonary matrix storage sites by elastase; however, release of these entities in vivo is not well defined. In the present study, we investigated the release of fibroblast growth factor-2 (FGF-2) and transforming growth factor-beta (TGF-beta), after intratracheal instillation of porcine pancreatic elastase into mice. We found that elastase promoted a time-dependent release of FGF-2 and TGF-beta1 from the lung into bronchoalveolar lavage (BAL) fluid. A large fraction of the TGF-beta1 in BAL fluid was in the active form (approximately 60%), suggesting that elastase might participate in the activation of TGF-beta1 from its latent form. Analysis of the levels of FGF-2 and TGF-beta1 in mouse blood indicated that the growth factors in BAL fluid were not entirely derived from blood. Moreover, elastase treatment of pulmonary fibroblasts cultures caused the release of TGF-beta1, suggesting that the TGF-beta1 in BAL fluid could have come from lung cells/matrix. Additional in vitro studies also indicated that TGF-beta1 plays a role in upregulating elastin mRNA levels. These data suggest that elastase releases growth factors from lung that participate in elastolytic injury responses.
Buczek-Thomas
Jo Ann
JA
Department of Biochemistry and the Pulmonary Center at Boston University School of Medicine, Boston, MA 02118, USA.
Lucey
Edgar C
EC
Stone
Phillip J
PJ
Chu
Chia L
CL
Rich
Celeste B
CB
Carreras
Isabel
I
Goldstein
Ronald H
RH
Foster
Judith A
JA
Nugent
Matthew A
MA
D000818:Animals; D001798:Blood Proteins / Q000378:metabolism; D002478:Cells, Cultured; D004549:Elastin / Q000096:biosynthesis / Q000235:genetics; D005260:Female; D016222:Fibroblast Growth Factor 2 / Q000187:drug effects / Q000378:metabolism*; D005347:Fibroblasts / Q000187:drug effects / Q000378:metabolism; D008168:Lung / Q000201:enzymology* / Q000378:metabolism* / Q000503:physiopathology; D051379:Mice; D010196:Pancreatic Elastase / Q000378:metabolism* / Q000494:pharmacology; D012333:RNA, Messenger / Q000187:drug effects / Q000378:metabolism; D051381:Rats; D011930:Reaction Time / Q000187:drug effects / Q000502:physiology; D016212:Transforming Growth Factor beta / Q000187:drug effects / Q000378:metabolism*; D015854:Up-Regulation / Q000187:drug effects / Q000502:physiology
D001798:Blood Proteins; D012333:RNA, Messenger; D016212:Transforming Growth Factor beta; D016222:Fibroblast Growth Factor 2; D004549:Elastin; D010196:Pancreatic Elastase