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Myofibroblast progenitor cells are increased in number in patients with type 1 diabetes and express less bone morphogenetic protein 6: a novel clue to adverse tissue remodelling?

Abstract：

AIMS/HYPOTHESIS:Growth factor imbalance and endothelial progenitor cell dysfunction are well-known elements of the inappropriate response to injury in human and experimental diabetes. We hypothesised that in diabetes the outgrowth of myofibroblast progenitor cells (MFPCs) is also altered and that this relates to aberrant gene expression of growth factors involving members of the TGF-beta/bone morphogenetic protein (BMP) superfamily. SUBJECTS AND METHODS:MFPCs were cultured from peripheral blood mononuclear cells of patients with type 1 diabetes and control subjects. Microarray analysis, quantitative PCR and ELISA were used to identify differentially regulated TGF-beta/BMP superfamily genes in diabetes- and control-derived MFPC. Possible effects of BMP6 on TGF-beta-induced gene expression were examined in cultured renal fibroblasts (TK173 cells). RESULTS:Blood from diabetic patients yielded higher numbers of MFPCs than blood from control subjects (1.6-fold increase, p<0.05), involving increased proliferation and decreased apoptosis. BMP6 mRNA and protein were downregulated in MFPCs derived from patients with diabetes (3.9- and 1.8-fold decrease, respectively, p<0.05). Furthermore, an inverse correlation was observed between BMP6 mRNA level and the number of MFPCs in patients with diabetes (r=-0.85, p<0.05). In TK173 cells, BMP6 antagonised the TGF-beta-induced expression of the genes encoding plasminogen activator inhibitor-1 and connective tissue growth factor (70 and 50% reduction, respectively). CONCLUSIONS/INTERPRETATION:Considering the importance of BMP6 in processes such as angiogenesis and its novel anti-TGF-beta effects, we propose that the excess numbers of BMP6-deficient MFPCs may favour adverse tissue remodelling in patients with diabetes, both numerically and by inappropriate orchestration of their microenvironment.

journal_name

Diabetologia

journal_title

Diabetologia

authors

Nguyen TQ,Chon H,van Nieuwenhoven FA,Braam B,Verhaar MC,Goldschmeding R

doi

10.1007/s00125-006-0172-0

subject

Has Abstract

pub_date

2006-05-01 00:00:00

pages

1039-48

issue

5

eissn

0012-186X

issn

1432-0428

journal_volume

49

pub_type

杂志文章

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