Targeted Reduction of Vascular Msx1 and Msx2 Mitigates Arteriosclerotic Calcification and Aortic Stiffness in LDLR-Deficient Mice Fed Diabetogenic Diets

被引：70

作者：

Cheng, Su-Li ^{[1
]}

Behrmann, Abraham ^{[1
]}

Shao, Jian-Su ^{[2
]}

Ramachandran, Bindu ^{[1
]}

Krchma, Karen ^{[1
]}

Arredondo, Yoanna Bello ^{[1
]}

Kovacs, Attila ^{[3
]}

Mead, Megan ^{[1
]}

Maxson, Robert ^{[4
]}

Towler, Dwight A. ^{[1
,5
]}

机构：

[1] Sanford Burnham Med Res Inst, Orlando, FL 32827 USA

[2] Univ Texas MD Anderson Canc Ctr, Houston, TX 77030 USA

[3] Washington Univ, St Louis, MO USA

[4] Univ So Calif, Norris Canc Ctr, Los Angeles, CA USA

[5] Florida Hosp, Translat Res Inst Metab & Diabet, Orlando, FL USA

来源：

DIABETES | 2014年 / 63卷 / 12期

基金：

美国国家卫生研究院;

关键词：

CRANIAL NEURAL CREST; DIABETIC ARTERIOSCLEROSIS; ARTERIAL CALCIFICATION; TRANSCRIPTION FACTORS; OSTEOCALCIN GENE; OXIDATIVE STRESS; PROGENITOR CELLS; BONE-FORMATION; MUSCLE; DIFFERENTIATION;

D O I：

10.2337/db14-0326

中图分类号：

R5 [内科学];

学科分类号：

1002 ; 100201 ;

摘要：

When fed high-fat diets, male LDLR-/- mice develop obesity, hyperlipidemia, hyperglycemia, and arteriosclerotic calcification. An osteogenic Msx-Wnt regulatory program is concomitantly upregulated in the vasculature. To better understand the mechanisms of diabetic arteriosclerosis, we generated SM22-Cre; Msx1(fl/fl); Msx2(fl/fl); LDLR-/- mice, assessing the impact of Msx1+Msx2 gene deletion in vascular myofibroblast and smooth muscle cells. Aortic Msx2 and Msx1 were decreased by 95% and 34% in SM22-Cre; Msx1(fl/fl); Msx2(fl/fl); LDLR-/- animals versus Msx1(fl/fl); Msx2(fl/fl); LDLR-/- controls, respectively. Aortic calcium was reduced by 31%, and pulse wave velocity, an index of stiffness, was decreased in SM22-Cre; Msx1(fl/fl); Msx2(fl/fl); LDLR-/- mice vs. controls. Fasting blood glucose and lipids did not differ, yet SM22-Cre; Msx1(fl/fl); Msx2(fl/fl); LDLR-/- siblings became more obese. Aortic adventitial myofibroblasts from SM22-Cre; Msx1(fl/fl); Msx2(fl/fl); LDLR-/- mice exhibited reduced osteogenic gene expression and mineralizing potential with concomitant reduction in multiple Wnt genes. Sonic hedgehog (Shh) and Sca1, markers of aortic osteogenic progenitors, were also reduced, paralleling a 78% reduction in alkaline phosphatase (TNAP)-positive adventitial myofibroblasts. RNA interference revealed that although Msx1+ Msx2 supports TNAP and Wnt7b expression, Msx1 selectively maintains Shh and Msx2 sustains Wnt2, Wnt5a, and Sca1 expression in aortic adventitial myofibroblast cultures. Thus, Msx1 and Msx2 support vascular mineralization by directing the osteogenic programming of aortic progenitors in diabetic arteriosclerosis.

引用

页码：4326 / 4337

页数：12

共 50 条

[1] Osteo-chondroprogenitor cells are derived from Sox9 expressing precursors [J].