Role of interleukin-1beta in acute inflammation and graft death after cell transplantation to the heart - PubMed (original) (raw)
Role of interleukin-1beta in acute inflammation and graft death after cell transplantation to the heart
Ken Suzuki et al. Circulation. 2004.
Abstract
Background: Poor survival of grafted cells is a major factor hindering the therapeutic effect of cell transplantation; however, the causes of cell death remain unclear. We hypothesized that interleukin-1beta (IL-1beta) might play a role in the acute inflammatory response and graft death after cell transplantation and that inhibition of IL-1beta might improve graft survival.
Methods and results: 14C-labeled male skeletal muscle precursor cells were implanted into female mouse hearts by direct intramuscular injection. The amount of 14C-label provides an estimate of the surviving cell number, whereas the amount of male-specific Smcy gene measured by polymerase chain reaction indicates the total (surviving+proliferated) number of donor-derived cells. At 10 minutes after implantation, 44.8+/-2.4% of the grafted cells survived and this steadily decreased to 14.6+/-1.1% by 24 hours, and to 7.9+/-0.6% by 72 hours (n=6 in each point). Proliferation of the surviving cells, which began after 24 hours, resulted in an increase in the total cell number from 15.5+/-0.8% at 24 hours to 24.4+/-1.6% at 72 hours. Acute inflammation was prominent at 24 hours and was reduced by 72 hours, in parallel with IL-1beta expression. Administration of anti-IL-1beta antibody improved graft survival at both 24 (25.6+/-1.6%) and 72 hours (14.8+/-1.1%) and resulted in a 2-fold increase in the total cell number at 72 hours (45.8+/-2.4%). The effects of IL-1beta inhibition corresponded with a reduced inflammatory response.
Conclusions: IL-1beta is involved in acute inflammation and graft death after direct intramyocardial cell transplantation. Targeted inhibition of IL-1beta may be a useful strategy to improve graft survival.
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