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Articles by E. H Sage
Total Records ( 2 ) for E. H Sage
  M Swinnen , D Vanhoutte , G. C Van Almen , N Hamdani , M. W.M Schellings , J D'hooge , J Van der Velden , M. S Weaver , E. H Sage , P Bornstein , F. K Verheyen , T VandenDriessche , M. K Chuah , D Westermann , W. J Paulus , F Van de Werf , B Schroen , P Carmeliet , Y. M Pinto and S. Heymans
 

Background— The progressive shift from a young to an aged heart is characterized by alterations in the cardiac matrix. The present study investigated whether the matricellular protein thrombospondin-2 (TSP-2) may affect cardiac dimensions and function with physiological aging of the heart.

Methods and Results— TSP-2 knockout (KO) and wild-type mice were followed up to an age of 60 weeks. Survival rate, cardiac function, and morphology did not differ at a young age in TSP-2 KO compared with wild-type mice. However, >55% of the TSP-2 KO mice died between 24 and 60 weeks of age, whereas <10% of the wild-type mice died. In the absence of TSP-2, older mice displayed a severe dilated cardiomyopathy with impaired systolic function, increased cardiac dilatation, and fibrosis. Ultrastructural analysis revealed progressive myocyte stress and death, accompanied by an inflammatory response and replacement fibrosis, in aging TSP-2 KO animals, whereas capillary or coronary morphology or density was not affected. Importantly, adeno-associated virus-9 gene–mediated transfer of TSP-2 in 7-week-old TSP-2 KO mice normalized their survival and prevented dilated cardiomyopathy. In TSP-2 KO animals, age-related cardiomyopathy was accompanied by increased matrix metalloproteinase-2 and decreased tissue transglutaminase-2 activity, together with impaired collagen cross-linking. At the cardiomyocyte level, TSP-2 deficiency in vivo and its knockdown in vitro decreased the activation of the Akt survival pathway in cardiomyocytes.

Conclusion— TSP-2 expression in the heart protects against age-dependent dilated cardiomyopathy.

  S. A Arnold , L. B Rivera , A. F Miller , J. G Carbon , S. P Dineen , Y Xie , D. H Castrillon , E. H Sage , P Puolakkainen , A. D Bradshaw and R. A. Brekken
  Shanna A. Arnold, Lee B. Rivera, Andrew F. Miller, Juliet G. Carbon, Sean P. Dineen, Yang Xie, Diego H. Castrillon, E. Helene Sage, Pauli Puolakkainen, Amy D. Bradshaw, and Rolf A. Brekken

Utilizing subcutaneous tumor models, we previously validated SPARC (secreted protein acidic and rich in cysteine) as a key component of the stromal response, where it regulated tumor size, angiogenesis and extracellular matrix deposition. In the present study, we demonstrate that pancreatic tumors grown orthotopically in Sparc-null (Sparc–/–) mice are more metastatic than tumors grown in wild-type (Sparc+/+) littermates. Tumors grown in Sparc–/– mice display reduced deposition of fibrillar collagens I and III, basement membrane collagen IV and the collagen-associated proteoglycan decorin. In addition, microvessel density and pericyte recruitment are reduced in tumors grown in the absence of host SPARC. However, tumors from Sparc–/– mice display increased permeability and perfusion, and a subsequent decrease in hypoxia. Finally, we found that tumors grown in the absence of host SPARC exhibit an increase in alternatively activated macrophages. These results suggest that increased tumor burden in the absence of host SPARC is a consequence of reduced collagen deposition, a disrupted vascular basement membrane, enhanced vascular function and an immune-tolerant, pro-metastatic microenvironment.

 
 
 
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