Document Detail

A novel rat model of abdominal aortic aneurysm using a combination of intraluminal elastase infusion and extraluminal calcium chloride exposure.
MedLine Citation:
PMID:  19958989     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: An ideal animal model of abdominal aortic aneurysm (AAA) is of great importance for clarifying unknown complex mechanisms of the pathogenesis. We introduce a new, simple technique to create reliable AAAs that simulate human aneurysms.
METHODS: Experimental models of AAAs were created in 71 rats by means of a 20-minute application of intraluminal elastase (30 U) and extraluminal calcium chloride (0.5M) in the 1-cm segment of infrarenal abdominal aorta (group EC, n = 26). A single application of elastase (group E, n = 24) or calcium chloride (group C, n = 21) was used as control. The treated aorta in each group was measured under physiologic conditions and harvested at 1 and 4 weeks. Successful AAA formation was defined as a dilation ratio >50%. Inflammatory response, elastolytic activity, and histology in the treated aorta were evaluated among the three groups.
RESULTS: The surgical procedure in each group was similarly completed for approximate 30 minutes and performed without any technical failure or operative death. At 4 weeks, the dilation ratio and wall thickness were 94.8% +/- 9.9% and 125.4 +/- 5.6 microm in group EC, 43.3% +/- 6.3% and 149.6 +/- 6.5 microm in group E, and 10.9% +/- 4.2% and 152.9 +/- 7.2 microm in group C. The success rate of AAA formation in group EC (92.7%) was significantly higher than that in group E (25.0%) and group C (0.0%). Less elastin content in the aortic wall was observed in group EC. At 1 week, tumor necrosis factor-alpha and interleukin-1beta messenger RNA (mRNA) expressions were significantly upregulated, and CD3+ and CD11b+ cells were significantly infiltrated into the treated aorta of group EC, compared with groups E or C. Gelatinolytic activities and mRNA expressions of matrix metalloproteinase (MMP)-2 and MMP-9 were also significantly activated in group EC.
CONCLUSION: The rat AAA model using a combination of intraluminal elastase infusion and extraluminal calcium chloride exposure is simple and easy to perform and is highly reliable and reproducible to create a saccular aneurysm similar to human AAAs. This model could be more useful to clarify AAA pathogenesis, mechanisms, and treatment interventions in experimental researches.
Akiko Tanaka; Tomomi Hasegawa; Zhi Chen; Yutaka Okita; Kenji Okada
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of vascular surgery     Volume:  50     ISSN:  1097-6809     ISO Abbreviation:  J. Vasc. Surg.     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2009-12-04     Completed Date:  2009-12-21     Revised Date:  2012-10-03    
Medline Journal Info:
Nlm Unique ID:  8407742     Medline TA:  J Vasc Surg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1423-32     Citation Subset:  IM    
Department of Surgery, Division of Cardiovascular Surgery, Kobe University Graduate School of Medicine, Kobe, Japan.
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MeSH Terms
Antigens, CD11b / metabolism
Antigens, CD3 / metabolism
Aorta, Abdominal / drug effects*,  metabolism,  pathology,  surgery
Aortic Aneurysm, Abdominal / chemically induced*,  metabolism,  pathology
Calcium Chloride / administration & dosage*
Disease Models, Animal*
Inflammation / chemically induced
Infusions, Intra-Arterial
Interleukin-1beta / genetics
Matrix Metalloproteinase 2 / genetics,  metabolism
Matrix Metalloproteinase 9 / genetics,  metabolism
Pancreatic Elastase / administration & dosage*
RNA, Messenger / metabolism
Rats, Sprague-Dawley
Reproducibility of Results
Time Factors
Tumor Necrosis Factor-alpha / genetics
Reg. No./Substance:
0/Antigens, CD11b; 0/Antigens, CD3; 0/Interleukin-1beta; 0/RNA, Messenger; 0/Tumor Necrosis Factor-alpha; 10043-52-4/Calcium Chloride; EC Elastase; EC Metalloproteinase 2; EC protein, rat; EC Metalloproteinase 9

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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