Stent implantation in coronary porcine arteries is associated with early activation of TNFα and TNFα receptor II expression


      Inflammation present in restenosis after angioplasty is associated with production of cytokines such as tumor necrosis factor (TNFα). However, limited data exist on the possible increase in TNFα and TNFα receptor expression induced during the chronic phase after stenting. To this end, swine underwent balloon denudation (PTCA) and stent implantation in coronary arteries. At day 1, 7 or 28 post-procedure, sections from injured and reference vessel segments were evaluated for extent of pathology and expression of TNFα and TNFα receptors (RI and RII). Restenosis assessed at days 7 and 28 showed, respectively, two- and six-fold more neointimal (NI) area in stented than in PTCA segments. Unlike reference segments, TNFα-positive cells were detected in both the media and the NI of injured segments, with a significant increase over the 28-day time frame. Stenting was associated with an eight-fold enhancement in TNFα expression over PTCA. TNFα expression and NI area tended to correlate in injured segments. Furthermore, the pattern of expression of TNFα-RII, but not TNFα-RI, resembled that of TNFα itself. These results implicate TNFα and TNFα-RII as important actors in both the acute and the chronic phases of inflammation following stent implantation.


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