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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
Increased plasma thrombospondin-1 (TSP-1) levels are associated with the TNF alpha-308A allele in children with juvenile dermatomyositis.
Vascular occlusion is more frequent in children with juvenile dermatomyositis (JDM) who have the TNF alpha-308A allele. One of the potent anti-angiogenic factors is thrombospondin-1 (TSP-1). This study investigated the association of the TNF alpha-308A allele with circulating levels of angiogenic mediators, TSP-1, and platelet factor 4 (PF4) using fresh, platelet-poor plasma (PPP). The TNF alpha-308A allele was characterized by PCR amplification and NcoI digestion. Concentrations of TSP-1 and PF4 in PPP from 31 JDM patients and 25 matched pediatric controls were determined by ELISA. The majority of the JDM children with the TNF alpha-308A allele (7/12) produced more TSP-1 than their TNF alpha-308G counterparts (P < 0.05), and their TSP-1 values were inversely related to those for PF4 (P < 0.0006). We conclude that the increased circulating concentrations of TSP-1 associated with the TNF alpha-308A allele suggest that this anti-angiogenic regulator may play a significant role in the augmented vascular occlusion observed in JDM children with this genetic marker.
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