1
|
Montezano AC, Rios FJ, Blaikie Z, Saad TE, Camargo L, Beattie W, Jaisser F, Guzik T, Graham D, Touyz RM. Abstract 127: Nox5 Expression In A Vascular Smooth Muscle Cell-specific Manner Induces Fibroblast To Myofibroblast Differentiation. Hypertension 2022. [DOI: 10.1161/hyp.79.suppl_1.127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Mice expressing human Nox5 (hNox5) in VSMC exhibit cardfiovascular fibrosis, where mechanisms are unknown. We postulated that VSMC-Nox5 promotes fibroblast to myofibroblast differentiation that contributes to fibrosis. Fibroblasts were cultured from wildtype (WT) and hNOX5 mice. Mice (20 weeks old) were infused with Ang II (600 ng/Kg/day) for 28 days and renal fibrosis/inflammation studied. Markers of myofibroblasts (αSMA), and pro-fibrotic and inflammatory signaling molecules were assessed by qPCR and immunoblotting. Inflammatory infiltrate was assessed by FACS. Fibroblasts from Nox5 mice exhibited increased mRNA of markers of myofibroblast αSMA (2
-ddC
:1.54±0.05
vs.
WT 0.78±0.17) and Myocd (2
-ddC
:1.36±0.17
vs.
WT 0.39±0.22), as well as, pro-fibrotic markers, Col1A1 (2
-ddC
:1.74±0.16
vs.
WT 0.67±0.11), Col3A1 (2
-ddC
:1.74±0.18
vs.
WT 0.96±0.24) and TIMP3 (2
-ddC
:2.65±0.25
vs.
WT 0.38±0.07), p<0.05. mRNA expression of CD36 (2
-ddC
:1.37±0.07
vs.
WT 86±0.24), TNFα (2
-ddC
:1.32±0.2
vs.
WT 0.71±0.17) and TNFR1 (2
-ddC
:1.26±0.04
vs.
WT 1.02±0.10) were increased, while CD68 expression was decreased (2
-ddC
:0.82±0.11
vs.
WT 1.36±0.18) in fibroblasts from Nox5 mice (p<0.05). In Nox5 mice fibroblasts, ROS production and TGFβ protein expression (AU:1.8±0.05
vs.
WT 1.4±0.06), as well as TGFβR2 gene expression (2
-ddC
:2.04±0.17
vs.
WT 0.57±0.12), were increased (p<0.05). mRNA of DNMT3a and TET2, DNA methylation regulatory enzymes, were also increased in fibroblasts from Nox5 mice, p<0.05. Kidneys from Ang II-infused Nox5 mice exhibited significant perivascular fibrosis and inflammatory cell infiltration compared to WT, as well as increased protein expression of TGFβ (AU: 3.59±0.8
vs.
WT 1.54±0.2) and IL-11 (AU: 0.64±0.08
vs.
WT 0.39±0.04), p<0.05; where levels of macrophage F4/80+ cells (%:24±2 vs WT 18±1, p<0.05) and levels of cytotoxic CD8+ T cells were increased, p<0.05. Kidney expression of vimentin (AU:1.01±0.05 vs WT 0.85±0.03) and αSMA (AU:0.44±0.03 vs WT 0.33±0.01), were increased in Nox5 mice (p<0.05). Nox5 regulates fibrosis by inducing fibroblast-to-myofibroblast differentiation, possibly through increased ROS. These processes may be important in Nox5-assocated cardiovascular-renal fibrosis.
Collapse
Affiliation(s)
| | | | | | | | - Livia Camargo
- Rsch Institute of the McGill Univ Health Cntr, Montreal, Canada
| | | | | | - Tomasz Guzik
- ICAMS - Univ of Glasgow, Glasgow, United Kingdom
| | | | | |
Collapse
|