Abstract | BACKGROUND:
Thalidomide is effective in the treatment of angiodysplasia. The mechanisms underlying its activity may be associated with inhibition of angiogenic factors. It was recently shown that Slit2/Robo1 signaling plays a role in angiogenesis. PURPOSE: The aim of this study was to explore the expression and effects of Robo1 and Slit2 in angiodysplasia and to identify the possible therapeutic mechanisms of thalidomide. METHOD: Slit2 and Robo1 expression were analyzed in tissue samples and human umbilical vein endothelial cells (HUVECs) treated with thalidomide using a combination of laboratory assays that were able to detect functional activity. RESULTS: Slit2, Robo1 and vascular endothelial growth factor ( VEGF) were strongly expressed in five angiodysplasia lesions out of seven cases, while expression was low in one out of seven normal tissues. Exposure of HUVECs to recombinant N-Slit2 resulted in an increase in VEGF levels and stimulated proliferation, migration and tube formation. These effects were blocked by an inhibitor of PI3K and thalidomide. CONCLUSIONS: Robo1 and Slit2 may have important roles in the formation of gastrointestinal vascular malformation. High concentrations of Slit2 increased the levels of VEGF in HUVECs via signaling through the PI3K/Akt pathway-an effect that could be inhibited by thalidomide.
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Authors | Yinan Li, Sengwang Fu, Haiying Chen, Qian Feng, Yunjie Gao, Hanbing Xue, Zhizheng Ge, Jingyuan Fang, Shudong Xiao |
Journal | Digestive diseases and sciences
(Dig Dis Sci)
Vol. 59
Issue 12
Pg. 2958-66
(Dec 2014)
ISSN: 1573-2568 [Electronic] United States |
PMID | 25326112
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Angiogenesis Inhibitors
- Chromones
- Intercellular Signaling Peptides and Proteins
- Morpholines
- Nerve Tissue Proteins
- Receptors, Immunologic
- Vascular Endothelial Growth Factor A
- roundabout protein
- 2-(4-morpholinyl)-8-phenyl-4H-1-benzopyran-4-one
- Thalidomide
- Phosphatidylinositol 3-Kinases
- Proto-Oncogene Proteins c-akt
- Slit homolog 2 protein
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Topics |
- Angiogenesis Inhibitors
(pharmacology)
- Cells, Cultured
- Chromones
(pharmacology)
- Endothelial Cells
(drug effects, metabolism)
- Gene Expression Regulation
(drug effects)
- Humans
- Intercellular Signaling Peptides and Proteins
(genetics, metabolism)
- Morpholines
(pharmacology)
- Neovascularization, Physiologic
(drug effects)
- Nerve Tissue Proteins
(genetics, metabolism)
- Phosphatidylinositol 3-Kinases
(genetics, metabolism)
- Proto-Oncogene Proteins c-akt
(genetics, metabolism)
- Receptors, Immunologic
(genetics, metabolism)
- Signal Transduction
- Thalidomide
(pharmacology)
- Vascular Endothelial Growth Factor A
(genetics, metabolism)
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