期刊
CYTOKINE
卷 23, 期 6, 页码 179-189出版社
ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD
DOI: 10.1016/S1043-4666(03)00225-4
关键词
tumor necrosis factor-alpha; interleukin-1 beta; bone formation; osteoblast; alcohol
资金
- NIAAA NIH HHS [AA12223] Funding Source: Medline
Chronic alcohol consumption is a risk factor for osteoporosis and inhibits osseous repair and regeneration. We investigated the hypothesis that chronic ethanol exposure induces the expression of TNF-alpha and/or IL-1beta and inhibits proliferation during distraction osteogenesis (DO). Following six weeks of liquid diet infusion (+/-ethanol) and 14 days of DO, the expression of TNF-alpha and IL-1beta in the distraction gap and contralateral femoral marrow of adult male rats was examined by immunohistochemistry and RT-PCR, respectively. In the bone marrow, the expression of both TNF-alpha and IL-1beta mRNA was significantly increased by ethanol (p < 0.04 for both). In the DO gap, ethanol exposure increased the expression of TNF-a in both the fibrous interzone and primary matrix front (PMF), while IL-1beta expression was not significantly affected in either region. A negative correlation was found between the percentage of PCNA+ and TNF+ cells in the PMF (p < 0.015, R-2 = 0.655). Incubation of MC3T3-E1 cells with ethanol for 24 or 48 h produced a time and dose dependent two- to fourfold increase in TNF-alpha transcripts as measured by RT-PCR, demonstrating that ethanol can directly induce TNF-alpha expression in osteoblast-like cells. These results support the hypothesis that attenuation of bone formation by ethanol may be mediated, in part, by local increases in TNF-alpha during osteogenesis. (C) 2003 Elsevier Ltd. All rights reserved.
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