title: Expression of a metalloproteinase family of ADAMTS in human vulnerable carotid lesions.
abstract: OBJECTIVE
  ADAMTS family of metalloproteases (a disintegrin and metalloprotease with thrombospondin motifs) possesses high proteolytic activity especially regarding proteoglycans. Their expression pattern in carotid plaques is as-yet unknown. The aim of the study was therefore the analysis of expression of ADAMTS1, 4, 5, and 13 and their inhibitors TIMP-1 and TIMP-3 in stable and unstable carotid plaques.
  
  
  METHODS
  Atherosclerotic plaques were collected from 40 patients (29 men, 11 women, mean age 70 years) undergoing carotid endarterectomy. The specimens were categorized into two groups (stable/unstable) according to Redgrave und Rothwell (The Oxford Plaque Study, 2008). SYBR Green-based real-time PCR, histology, and immunohistochemistry were performed.
  
  
  RESULTS
  All ADAMTS tested in our study were expressed in both stable and unstable plaques, especially in smooth muscle cells (SMCs) and macrophages. Analysis of the expression pattern on mRNA level showed significant higher expression of ADAMTS1 in unstable plaques compared with stable plaques (1.7-fold, P = 0.049). The expression of ADAMTS4 and 5 was also increased in unstable lesions; however, these changes were not statistically significant (1.2-fold, P = 0.667 and 1.6-fold, P = 0.077). Expression of TIMP-1 was significantly reduced in unstable plaques compared with stable ones (1.9-fold, P = 0.014).
  
  
  CONCLUSIONS
  SMCs seem to be an important source of ADAMTS analyzed in our study. Furthermore, expression of ADAMTS1 was found to be increased in unstable carotid lesions and might potentially contribute to plaque vulnerability.
authors.affiliation: aDepartment of Vascular and Endovascular Surgery, Klinikum rechts der Isar der Technischen Universitaet Muenchen, Munich bKantonsspital Baselland, Orthopaedics und Traumatology, CH-4410 Liestal cDepartment of Surgery, Munich Transplant Centre, Klinikum rechts der Isar der Technischen Universitaet Muenchen dDZHK (German Centre for Cardiovascular Research), partner site Munich Heart Alliance, Munich, Germany.
authors.forename: Jaroslav
authors.initials: J
authors.lastname: Pelisek
authors.forename: Lena
authors.initials: L
authors.lastname: Deutsch
authors.forename: Anna
authors.initials: A
authors.lastname: Ansel
authors.forename: Julia
authors.initials: J
authors.lastname: Pongratz
authors.forename: Thomas
authors.initials: T
authors.lastname: Stadlbauer
authors.forename: Harry
authors.initials: H
authors.lastname: Gebhard
authors.forename: Edouard
authors.initials: E
authors.lastname: Matevossian
authors.forename: Hans-Henning
authors.initials: HH
authors.lastname: Eckstein
mesh_terms: D000071097:ADAMTS1 Protein / Q000235:genetics*; D000368:Aged; D016893:Carotid Stenosis / Q000601:surgery*; D016894:Endarterectomy, Carotid; D005260:Female; D005858:Germany; D006801:Humans; D007150:Immunohistochemistry; D008264:Macrophages / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D032389:Myocytes, Smooth Muscle / Q000378:metabolism; D058226:Plaque, Atherosclerotic / Q000235:genetics* / Q000473:pathology*; D012189:Retrospective Studies; D020521:Stroke / Q000453:epidemiology* / Q000209:etiology; D019715:Tissue Inhibitor of Metalloproteinase-1 / Q000235:genetics; D019717:Tissue Inhibitor of Metalloproteinase-3 / Q000235:genetics
chemical_list: C560822:TIMP1 protein, human; C088390:TIMP3 protein, human; D019715:Tissue Inhibitor of Metalloproteinase-1; D019717:Tissue Inhibitor of Metalloproteinase-3; D000071097:ADAMTS1 Protein; C103859:ADAMTS1 protein, human