University of Massachusetts Medical School Faculty Publications
Title
Orphan nuclear receptor TR3/Nur77 improves wound healing by upregulating the expression of integrin beta4
UMMS Affiliation
Department of Molecular, Cell and Cancer Biology
Publication Date
2014-10-17
Document Type
Article
Subjects
Animals; Cell Movement; Cell Proliferation; Human Umbilical Vein Endothelial Cells; Humans; Integrin beta4; Mice; Mice, Inbred C57BL; Mice, Knockout; Neovascularization, Pathologic; Neovascularization, Physiologic; Nuclear Receptor Subfamily 4, Group A, Member 1; Promoter Regions, Genetic; RNA, Small Interfering; Signal Transduction; Skin; Up-Regulation; Wound Healing
Disciplines
Cancer Biology | Cardiovascular Diseases | Cardiovascular System | Cell Biology | Cellular and Molecular Physiology | Genetics and Genomics | Molecular Biology | Neoplasms | Pathological Conditions, Signs and Symptoms | Tissues
Abstract
Tissue repair/wound healing, in which angiogenesis plays an important role, is a critical step in many diseases including chronic wound, myocardial infarction, stroke, cancer, and inflammation. Recently, we were the first to report that orphan nuclear receptor TR3/Nur77 is a critical mediator of angiogenesis and its associated microvessel permeability. Tumor growth and angiogenesis induced by VEGF-A, histamine, and serotonin are almost completely inhibited in Nur77 knockout mice. However, it is not known whether TR3/Nur77 plays any roles in wound healing. In these studies, skin wound-healing assay was performed in 3 types of genetically modified mice having various Nur77 activities. We found that ectopic induction of Nur77 in endothelial cells of mice is sufficient to improve skin wound healing. Although skin wound healing in Nur77 knockout mice is comparable to the wild-type control mice, the process is significantly delayed in the EC-Nur77-DN mice, in which a dominant negative Nur77 mutant is inducibly and specifically expressed in mouse endothelial cells. By a loss-of-function assay, we elucidate a novel feed-forward signaling pathway, integrin beta4 --> PI3K --> Akt --> FAK, by which TR3 mediates HUVEC migration. Furthermore, TR3/Nur77 regulates the expression of integrin beta4 by targeting its promoter activity. In conclusion, expression of TR3/Nur77 improves wound healing by targeting integrin beta4. TR3/Nur77 is a potential candidate for proangiogenic therapy. The results further suggest that TR3/Nur77 is required for pathologic angiogenesis but not for developmental/physiologic angiogenesis and that Nur77 and its family members play a redundant role in normal skin wound healing.
Keywords
VEGF, angiogenesis
DOI of Published Version
10.1096/fj.14-257550
Source
FASEB J. 2015 Jan;29(1):131-40. doi: 10.1096/fj.14-257550. Epub 2014 Oct 17. Link to article on publisher's site
Related Resources
Journal/Book/Conference Title
FASEB journal : official publication of the Federation of American Societies for Experimental Biology
PubMed ID
25326539
Repository Citation
Niu G, Ye T, Qin L, Bourbon PM, Chang C, Zhao S, Li Y, Zhou L, Cui P, Rabinovitz I, Mercurio AM, Zhao D, Zeng H. (2014). Orphan nuclear receptor TR3/Nur77 improves wound healing by upregulating the expression of integrin beta4. University of Massachusetts Medical School Faculty Publications. https://doi.org/10.1096/fj.14-257550. Retrieved from https://escholarship.umassmed.edu/faculty_pubs/649