Gender Differences in Experimental Aortic Aneurysms

实验性主动脉瘤的性别差异

• 批准号: 8628327
• 负责人: Gilbert Rivers Upchurch
• 金额: $ 39.5万
• 依托单位: UNIVERSITY OF VIRGINIA
• 依托单位国家: 美国
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-01 至 2018-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8628327
• 关键词: Abdominal Aortic Aneurysm; Address; Adipose tissue; Age; Agonist; Aneurysm; Angiotensin II; Animals; Anti-Inflammatory Agents; Anti-inflammatory; Aortic Aneurysm; Apolipoprotein E; Attenuated; Binding; Biological Response Modifiers; Blood Vessels; Bone Marrow; CCL2 gene; CD4 Positive T Lymphocytes; Caliber; Caucasians; Caucasoid Race; Cause of Death; Cells; Cellular Infiltration; Chemicals; Clinical; Collagen; Data; Development; Diet; Dinoprostone; Disease; Elastases; Elastin; Enzyme-Linked Immunosorbent Assay; Enzymes; Estradiol; Estrogen Receptors; Estrogen Therapy; Estrogens; Evaluation; Excision; Female; Flow Cytometry; Gender; Gonadal structure; Growth; Growth Factor; HMGB1 Protein; Harvest; Histologic; Histology; Hormones; Human; Immune; Immunohistochemistry; In Vitro; Incidence; Infiltration; Inflammation; Inflammatory; Interferons; Interleukin-1; Interleukin-17; Interleukin-6; Knockout Mice; Leukocytes; Life; MMP2 gene; MMP9 gene; Matrix Metalloproteinases; Measurement; Measures; Mediating; Medical; Mesenchymal Stem Cells; Methods; Modeling; Molecular; Mus; Neutrophil Infiltration; Nuclear Protein; Operative Surgical Procedures; Orchiectomy; Patients; Pattern; Perfusion; Phytoestrogens; Placenta; Plasminogen Activator Inhibitor 1; Preventive; Production; Property; Prostaglandins; RANTES; Regulation; Research Proposals; Risk Factors; Rodent; Role; Serine Protease; Sex Characteristics; Smoking History; Smooth Muscle; Smooth Muscle Actin Staining Method; Smooth Muscle Myocytes; T-Lymphocyte; TNF gene; Tamoxifen; Therapeutic; Tissues; Translating; Tunica Adventitia; Up-Regulation; Vascular Endothelial Growth Factors; Vascular remodeling; Western Blotting; attenuation; base; cellular targeting; cytokine; dietary supplements; feeding; hormone regulation; human female; implantation; inflammatory marker; inhibitor/antagonist; interleukin-23; macrophage; male; mortality; mouse model; neutrophil; paracrine; prevent; public health relevance; receptor expression; research study; treatment strategy; vascular inflammation

Hypothesis: Our previous studies using elastase-perfusion and angiotensin II models of abdominal aortic aneurysms (AAA) have shown that female rodents have a decreased incidence and size of aneurysm formation. We have also recently shown that human placental mesenchymal stem cells (MSCs) are protective in a mouse model of AAA. In the current proposal, we will investigate the role of dietary phytoestrogen as a preventive therapy, and its synergistic effects with MSCs as a treatment strategy to protect against AAA. Methods: We will use an elastase-perfusion and angiotensin II murine model of AAA using male and female wild-type, estrogen receptor knockout mice (ER-¿-/- and ER-b-/-) and ApoE-/- mice. Dietary phytoestrogen will be administered to male and female mice via estrogen-rich or estrogen-free chow. Various subsets of female MSCs (placenta-, bone marrow- or adipose-derived) primed with or without estrogen will be administered intravenously or by aortic implantation in mice models of AAA. Aortic diameter will be measured on day 3, 7 and 14 (elastase perfusion model) and day 28 (angiotensin II model). Aortic tissue will be harvested to analyze pro-inflammatory cytokine (IL-17, TNF-¿, MCP-1, IL-1¿, KC and RANTES) and HMGB1 (high mobility group box 1; a pro-inflammatory nuclear protein) production by ELISA, MMP2 and MMP9 activity by zymography, serine proteases (uPA, tPA and PAI-1) by western blots, paracrine factors (VEGF, HGF, PGE2) by ELISA, elastin and collagen degradation as well as aortic smooth muscle expression by histology, and immune cell (macrophages, CD4+ T cells, neutrophils) infiltration by flow cytometry. Results: Preliminary results demonstrate a significant upregulation of estrogen receptor (ER-a) expression in female mice on days 1, 3 and 14 after elastase-perfusion compared to males, as well as in aortic tissue from human females compared to males after AAA. Also, male mice fed a diet rich in estrogen display a significantly decreased aortic diameter, decreased cytokine production (IL-23, IL-1¿, IL-6 and IL-27), decreased MMP2 and 9 expression and decreased macrophage and neutrophil infiltration compared to male mice fed an estrogen free diet. Furthermore, treatment with human female MSCs attenuates aortic diameter, pro-inflammatory cytokine production and cell infiltration after AAA. Female MSCs inhibit HMGB1 and IL-17 production more significantly than male MSCs. Also, estradiol-priming of female MSCs offer significantly increased protection from vascular inflammation in aortic tissue from male AAA patients. Conclusions: Dietary estrogen therapy and mesenchymal stem cells can attenuate aneurysm formation and inflammation in the elastase-perfusion murine model of AAA and in human aortic tissue from AAA patients. We propose to delineate the phytoestrogen mediated anti-inflammatory effects, and its crosstalk with various subsets of gender-specific MSCs, on aortic aneurysm formation in the murine (elastase-perfusion and angiotensin II) models as well aortic tissue and cells from AAA patients.

假设：我们之前的研究使用了弹性蛋白酶灌注和血管紧张素II模型