Abstract
In previous studies, the expression and the role of proangiogenic factors in infantile hemangiomas have been well studied. However, the role of angiogenic inhibitors has been revealed rarely. The expression of PEDF, as the strongest and safe endogenous inhibitor, is still unrecognized until the current study. In order to investigate the expression and significance of the pigment epithelium-derived factor (PEDF) in the proliferating and regressing phases of infantile hemangiomas, the expression of PEDF, VEGF, Ki-67, and CD34 protein in hemangioma tissues was examined with immunohistochemical polymer HRP method in 42 cases during the proliferative phase, 40 cases during the regressing phase, and 11 cases of non-involuting congenital hemangiomas (NICHs). Meanwhile, the mRNA expression of these factors was detected with quantitative realtime RT-PCR. We found the protein and mRNA expression of PEDF in regressing phase was significantly higher than those in proliferative phase and NICHs (P < 0.001), while the protein and mRNA expression of VEGF were much lower (P < 0.001). The microvessel density (MVD), Ki-67 changes, and the expression of PEDF and VEGF were found significantly correlated. These results indicated that the reduction of VEGF and increase in PEDF are causative to the evolution of infantile hemangioma. PEDF may play a key role in the spontaneous regression of infantile hemangioma and may become an important potential therapeutic agent for infantile hemangioma.
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Acknowledgements
Sincere thanks are due to Fangmeng Fu for his valuable academic suggestion and his warm encouragement, and to Yuanjing Chen for his assistance with the experiments.
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This research was supported by Fujian Youth Foundation of Fujian Health Department (2013-1-28) and the National Natural Science Foundation of China (81470125).
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All procedures performed in the study involving human participants were in accordance with the ethical standards of the Bioethical Committee of Affiliated Fujian Union Hospital of Fujian Medical University and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from parents of all individual participants included in the study.
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Li, M., Chen, Y., Guo, Z. et al. The pigment epithelium-derived factor (PEDF): an important potential therapeutic agent for infantile hemangioma. Arch Dermatol Res 309, 169–178 (2017). https://doi.org/10.1007/s00403-017-1716-5
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DOI: https://doi.org/10.1007/s00403-017-1716-5