Abstract:
BACKGROUND:The absence of functional dystrophin in Duchenne muscular dystrophy (DMD) patients and in mdx mice results in progressive muscle degeneration associated with necrosis, fibrosis, and inflammation. Because vascular supply plays a key role in tissue repair, we examined whether new blood vessel development was altered in mdx mice. METHODS AND RESULTS:In a model of hindlimb ischemia on femoral artery dissection, hindlimb perfusion, measured by laser Doppler imaging, was higher in mdx mice (0.67+/-0.26) than in wild-type (WT) mice (0.33+/-0.18, P<0.03). In keeping with these data, a significant increase in arteriole length density was found in mdx mice (13.6+/-8.4 mm/mm3) compared with WT mice (7.8+/-4.6 mm/mm3, P<0.03). Conversely, no difference was observed in capillary density between mice of the 2 genotypes. The enhanced regenerative response was not limited to ischemic skeletal muscle, because in a wound-healing assay, mdx mice showed an accelerated wound closure rate compared with WT mice. Moreover, a vascularization assay in Matrigel plugs containing basic fibroblast growth factor injected subcutaneously revealed an increased length density of arterioles in mdx (46.9+/-14.7 mm/mm3) versus WT mice (19.5+/-5.8 mm/mm3, P<0.001). Finally, serum derived from mdx mice sustained formation of endothelium-derived tubular structures in vitro more efficiently than WT serum. CONCLUSIONS:These results demonstrate that arteriogenesis is enhanced in mdx mice both after ischemia and skin wounding and in response to growth factors.
journal_name
Circulationjournal_title
Circulationauthors
Straino S,Germani A,Di Carlo A,Porcelli D,De Mori R,Mangoni A,Napolitano M,Martelli F,Biglioli P,Capogrossi MCdoi
10.1161/01.CIR.0000147776.50787.74subject
Has Abstractpub_date
2004-11-23 00:00:00pages
3341-8issue
21eissn
0009-7322issn
1524-4539pii
01.CIR.0000147776.50787.74journal_volume
110pub_type
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