title: Diet-induced obesity drives negative mouse vein graft wall remodeling.
abstract: BACKGROUND
  The heightened inflammatory phenotype associated with obesity has been linked to the development of cardiovascular diseases. Short-term high-fat feeding induces a proinflammatory state that may impact the blood vessel wall. CD11c, a significantly increased dendritic cell biomarker during diet-induced obesity (DIO), may have a mechanistic role in this high-fat feeding effect. We hypothesized that the proinflammatory effect of short-term DIO accelerates vein bypass graft failure via CD11c-dependent mechanisms.
  
  
  METHODS
  Male 9-week-old DIO mice (n = 13, C57BL/6J recipients; n = 6, CD11c(-/-) recipients) and normal chow controls (n = 15, C57BL/6J recipients; n = 6, CD11c(-/-) recipients) underwent unilateral carotid interposition vein isografting (inferior vena cava from the same diet and genetic background donor), with a midgraft or outflow focal stenosis. Vein grafts were harvested at either 1 week (immunohistochemical staining for early CD11c expression) or 4 weeks later (morphometric analyses and CD11c evaluation).
  
  
  RESULTS
  Despite a 40% larger body size, C57BL/6J DIO mice had 44% smaller poststenosis vein graft lumens (P = .03) than their controls via an acceleration of overall negative vein graft wall remodeling in the day-28 midgraft focal stenosis model but not in the outflow stenosis model. Higher CD11c expression occurred in DIO midgraft-stenosis vein graft walls, both at postoperative days 7 and 28. In contrast, with in vivo CD11c deficiency, DIO did not elicit this poststenotic negative remodeling but attenuated intimal hyperplasia.
  
  
  CONCLUSIONS
  These findings highlight negative wall remodeling as a potential factor leading to vein graft failure and provide direct evidence that short-term dietary alterations in the mammalian metabolic milieu can have lasting implications related to acute vascular interventions. DIO induces negative mouse vein graft wall remodeling via CD11c-depedent pathways.
authors.affiliation: Division of Vascular and Endovascular Surgery, Brigham and Women's Hospital/Harvard Medical School, Boston, Mass.
authors.forename: Peng
authors.initials: P
authors.lastname: Yu
authors.affiliation: Division of Vascular and Endovascular Surgery, Brigham and Women's Hospital/Harvard Medical School, Boston, Mass.
authors.forename: Binh T
authors.initials: BT
authors.lastname: Nguyen
authors.affiliation: Division of Vascular and Endovascular Surgery, Brigham and Women's Hospital/Harvard Medical School, Boston, Mass.
authors.forename: Ming
authors.initials: M
authors.lastname: Tao
authors.affiliation: Division of Vascular and Endovascular Surgery, Brigham and Women's Hospital/Harvard Medical School, Boston, Mass.
authors.forename: Tianyu
authors.initials: T
authors.lastname: Jiang
authors.affiliation: Division of Vascular and Endovascular Surgery, Brigham and Women's Hospital/Harvard Medical School, Boston, Mass. Electronic address: ckozaki@partners.org.
authors.forename: C Keith
authors.initials: CK
authors.lastname: Ozaki
mesh_terms: D000818:Animals; D016893:Carotid Stenosis / Q000601:surgery*; D004041:Dietary Fats / Q000009:adverse effects*; D004195:Disease Models, Animal; D006083:Graft Occlusion, Vascular / Q000209:etiology / Q000473:pathology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009765:Obesity / Q000150:complications / Q000601:surgery*; D014682:Vena Cava, Inferior / Q000473:pathology / Q000637:transplantation*
chemical_list: D004041:Dietary Fats