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The metabolomic approach is useful in diagnosing and predicting the development of rheumatoid arthritis (RA) and osteoarthritis (OA) and is emerging as a useful tool for identifying disease biomarkers. The aim of this study was to compare the metabolic blueprint of fibroblast-like synoviocyte (FLS) cells and induced pluripotent stem cells (iPSCs) derived from RA and OA patients.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      Somatic cells of RA patients (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u20093) and OA patients (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u20093) were isolated, transduced with a lentiviral plasmid, and reprogrammed into iPSCs displaying pluripotency. Metabolic profiling of RA and OA patient\u2013derived FLS cells and iPSCs was performed using liquid chromatography\/mass spectrometry and statistical analysis. After normalization by the sum of the peak intensities through LC\/MS, 37 metabolites were detected across RA and OA patients.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The metabolites of RA and OA were distinguishable according to the PLS-DA analysis. LysoPC (20:4), 4-methoxychalcone, phosphorylcholine, and nicotinamide (NAM) were significantly higher in RA iPSCs than in OA iPSCs (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05). The NMNAT-3 enzyme, which catalyzes an important step in the biosynthesis of NAD\n                      <jats:sup>+<\/jats:sup>\n                      from adenosine triphosphate, was also upregulated in RA iPSCs. Interestingly, the proliferation of RA iPSCs was significantly greater than OA iPSC proliferation (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05). NAM played a critical role in the proliferation of RA iPSCs but not in OA iPSCs. When iPSCs were treated with 100\u2009nM of the NAM inhibitor tannic acid (TA), the proliferation of RA iPSCs was significantly reduced (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.001).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The metabolites of RA and OA FLS cells and RA and OA iPSCs were all clearly distinguishable from each other. NAM played a critical role in the proliferation of RA iPSCs but not in OA iPSCs. TA effectively inhibited the expression of NAM in RA iPSCs and is a possible effective treatment for RA patients.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s13287-019-1408-5","type":"journal-article","created":{"date-parts":[[2019,11,15]],"date-time":"2019-11-15T08:02:50Z","timestamp":1573804970000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Metabolomic profiles of induced pluripotent stem cells derived from patients with rheumatoid arthritis and osteoarthritis"],"prefix":"10.1186","volume":"10","author":[{"given":"Juryun","family":"Kim","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sunyoung Christina","family":"Kang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Na Eun","family":"Yoon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yena","family":"Kim","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinhyeok","family":"Choi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Narae","family":"Park","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hyerin","family":"Jung","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Byung Hwa","family":"Jung","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ji Hyeon","family":"Ju","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2019,11,15]]},"reference":[{"key":"1408_CR1","doi-asserted-by":"publisher","first-page":"7","DOI":"10.3803\/EnM.2016.31.1.7","volume":"31","author":"SJ Kim","year":"2016","unstructured":"Kim SJ, Kim SH, Kim JH, Hwang S, Yoo HJ. 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