title: Alteration of type I and III collagen expression in human peritoneal mesothelial cells in response to hypoxia and transforming growth factor-beta1.
abstract: Overexpression and accumulation of extracellular matrix is central to peritoneal adhesion formation following surgically induced tissue trauma. Transforming growth factor-beta1 and hypoxia have been implicated in tissue fibrosis and postoperative adhesion formation. To extend this observation we examined whether transforming growth factor-beta1 and/or hypoxia regulate the expression of type I and III collagen in human peritoneal mesothelial cells. Cultured human mesothelial cells were maintained under hypoxia (2% oxygen), or treated with transforming growth factor-beta1 (1 ng/ml) or a combination of hypoxia and transforming growth factor-beta1. Total cellular RNA from treated and untreated cells were collected and subjected to multiplex reverse transcription/polymerase chain reaction to quantitate collagen I and III mRNA levels in response to these treatments. The results indicate that 6 hours of hypoxia increased collagen III mRNA by 7.2 fold which was further increased to 9.4 fold following transforming growth factor-beta1 treatment; in contrast collagen I mRNA decreased by 0.42 fold which was further decreased by 0.3 fold following transforming growth factor-beta1 treatment. Transforming growth factor-beta1 treatment under normal conditions resulted in an 8.4-fold increase and a 0.3-fold decrease in collagen III and I mRNA levels, respectively. Hypoxia treatment also resulted in a 1.9-fold increase in transforming growth factor-beta1 mRNA level compared with control. The ratio of type III/I collagen was increased in response to transforming growth factor-beta1 treatment under hypoxic condition. In conclusion, the data suggest that hypoxia may modulate extracellular matrix production by human mesothelial cells via a transforming growth factor-beta1 dependent mechanism.
authors.affiliation: Depatment of Obstetrics and Gynecology, Hutzel Hospital, Wayne State University, Detroit, MI 48201, USA. G.Saed@wayne.edu
authors.forename: G M
authors.initials: GM
authors.lastname: Saed
authors.forename: W
authors.initials: W
authors.lastname: Zhang
authors.forename: N
authors.initials: N
authors.lastname: Chegini
authors.forename: L
authors.initials: L
authors.lastname: Holmdahl
authors.forename: M P
authors.initials: MP
authors.lastname: Diamond
mesh_terms: D015687:Cell Hypoxia; D002478:Cells, Cultured; D003094:Collagen / Q000378:metabolism*; D004847:Epithelial Cells / Q000187:drug effects / Q000378:metabolism*; D005109:Extracellular Matrix / Q000378:metabolism; D006801:Humans; D010537:Peritoneum / Q000166:cytology; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016212:Transforming Growth Factor beta / Q000494:pharmacology*
chemical_list: D012333:RNA, Messenger; D016212:Transforming Growth Factor beta; D003094:Collagen