LIGHT

• Published in: PloS one Vol. 11; no. 11; p. e0166589
• Main Authors: Jo, Jae-Cheol, Kim, Jeong Yi, Heo, Sook-Kyoung, Noh, Eui-Kyu, Choi, Yunsuk, Gwon, Gi-Dong, Min, Young Joo, Baek, Jin Ho, Koh, SuJin, Kim, Hawk
• Format: Journal Article
• Language: English
• Published: Public Library of Science 11.11.2016
• Subjects: B cells; Dendritic cells; Enzyme-linked immunosorbent assay; Platelet-derived growth factor; Stem cell transplantation; Stem cells; T cells; Transforming growth factors; Tumor necrosis factor
• ISSN: 1932-6203

LIGHT (HVEM-L, TNFSF14, or CD258), an entity homologous to lymphotoxins, with inducible nature and the ability to compete with herpes simplex virus glycoprotein D for herpes virus entry mediator (HVEM)/tumor necrosis factor (TNF)-related 2, is a member of the TNF superfamily. It is expressed as a homotrimer on activated T cells and dendritic cells (DCs), and has three receptors: HVEM, LT-[beta] receptor (LT[beta]R), and decoy receptor 3 (DcR3). So far, three receptors with distinct cellular expression patterns are known to interact with LIGHT. Follicular DCs and stromal cells bind LIGHT through LT[beta]R. We monitored the effects of LIGHT on human bone marrow-derived mesenchymal stem cells (BM-MSCs). At first, we checked the negative and positive differentiation markers of BM-MSCs. And we confirmed the quality of MSCs by staining cells undergoing adipogenesis (Oil Red O staining), chondrogenesis (Alcian blue staining), and osteogenesis (Alizarin red staining). After rhLIGHT treatment, we monitored the count, viability, and proliferation of cells and cell cycle distribution. PDGF and TGF[beta] production by rhLIGHT was examined by ELISA, and the underlying biological mechanisms were studied by immunoblotting by rhLIGHT treatment. LT[beta]R was constitutively expressed on the surface of human BM-MSCs. Cell number and viability increased after rhLIGHT treatment. BM-MSC proliferation was induced by an increase in the S/G.sub.2 /M phase. The expression of not only diverse cyclins such as cyclin B1, D1, D3, and E, but also CDK1 and CDK2, increased, while that of p27 decreased, after rhLIGHT treatment. RhLIGHT-induced PDGF and TGF[beta] production mediated by STAT3 and Smad3 activation accelerated BM-MSC proliferation. Thus, LIGHT and LT[beta]R interaction increases the survival and proliferation of human BM-MSCs, and therefore, LIGHT might play an important role in stem cell therapy.