{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T23:45:22Z","timestamp":1791589522228,"version":"4.3.4"},"reference-count":52,"publisher":"Oxford University Press (OUP)","issue":"7","license":[{"start":{"date-parts":[[2010,6,30]],"date-time":"2010-06-30T00:00:00Z","timestamp":1277856000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2010,7,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>To gain insight into the effect of diabetes on fracture healing, experiments were carried out focusing on chondrocyte apoptosis during the transition from cartilage to bone. Type 1 diabetes was induced in mice by multiple low-dose streptozotocin injections, and simple transverse fractures of the tibia or femur was carried out. Large-scale transcriptional profiling and gene set enrichment analysis were performed to examine apoptotic pathways on total RNA isolated from fracture calluses on days 12, 16, and 22, a period of endochondral bone formation when cartilage is resorbed and chondrocyte numbers decrease. Tumor necrosis factor \u03b1 (TNF-\u03b1) protein levels were assessed by ELISA and caspase-3 by bioactivity assay. The role of TNF was examined by treating mice with the TNF-specific inhibitor pegsunercept. In vitro studies investigated the proapoptotic transcription factor FOXO1 in regulating TNF-induced apoptosis of chondrogenic ATDC5 and C3H10T1\/2 cells as representative of differentiated chondrocytes, which are important during endochondral ossification. mRNA profiling revealed an upregulation of gene sets related to apoptosis in the diabetic group on day 16 when cartilage resorption is active but not day 12 or day 22. This coincided with elevated TNF-\u03b1 protein levels, chondrocyte apoptosis, enhanced caspase-3 activity, and increased FOXO1 nuclear translocation (p\u2009&amp;lt;\u2009.05). Inhibition of TNF significantly reduced these parameters in the diabetic mice but not in normoglycemic control mice (p\u2009&amp;lt;\u2009.05). Silencing FOXO1 using siRNA in vitro significantly reduced TNF-induced apoptosis and caspase activity in differentiated chondrocytes. The mRNA levels of the proapoptotic genes caspase-3, caspase-8, caspase-9, and TRAIL were significantly reduced with silencing of FOXO1 in chondrocytic cells. Inhibiting caspase-8 and caspase-9 significantly reduced TNF-induced apoptosis in chondrogenic cells. These results suggest that diabetes causes an upregulation of proapoptotic genes during the transition from cartilage to bone in fracture healing. Diabetes increased chondrocyte apoptosis through a mechanism that involved enhanced production of TNF-\u03b1, which stimulates chondrocyte apoptosis and upregulates mRNA levels of apoptotic genes through FOXO1 activation. \u00a9 2010 American Society for Bone and Mineral Research<\/jats:p>","DOI":"10.1002\/jbmr.59","type":"journal-article","created":{"date-parts":[[2010,2,8]],"date-time":"2010-02-08T15:02:14Z","timestamp":1265641334000},"page":"1604-1615","source":"Crossref","is-referenced-by-count":143,"title":["TNF-\u03b1 mediates diabetes-enhanced chondrocyte apoptosis during fracture healing and stimulates chondrocyte apoptosis Through FOXO1"],"prefix":"10.1093","volume":"25","author":[{"given":"Rayyan A","family":"Kayal","sequence":"first","affiliation":[{"name":"Department of Periodontology and Oral Biology, Boston University School of Dental Medicine, Boston, MA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michelle","family":"Siqueira","sequence":"additional","affiliation":[{"name":"Department of Periodontology and Oral Biology, Boston University School of Dental Medicine, Boston, MA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jazia","family":"Alblowi","sequence":"additional","affiliation":[{"name":"Department of Periodontology and Oral Biology, Boston University School of Dental Medicine, Boston, MA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jody","family":"McLean","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, Boston University School of Medicine, Boston, MA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nanarao","family":"Krothapalli","sequence":"additional","affiliation":[{"name":"Department of Periodontology and Oral Biology, Boston University School of Dental Medicine, Boston, MA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dan","family":"Faibish","sequence":"additional","affiliation":[{"name":"Department of Periodontology and Oral Biology, Boston University School of Dental Medicine, Boston, MA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas A","family":"Einhorn","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, Boston University School of Medicine, Boston, MA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Louis C","family":"Gerstenfeld","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, Boston University School of Medicine, Boston, MA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dana T","family":"Graves","sequence":"additional","affiliation":[{"name":"Department of Periodontics, University of Medicine and Dentistry of New Jersey, Newark, NJ, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2010,6,30]]},"reference":[{"key":"2024020320132931400_bib1","doi-asserted-by":"crossref","first-page":"297","DOI":"10.1677\/joe.0.1590297","article-title":"Serum levels of insulin-like growth factor system components and relationship to bone metabolism in type 1 and type 2 diabetes mellitus patients","volume":"159","author":"Jehle","year":"1998","journal-title":"J Endocrinol."},{"key":"2024020320132931400_bib2","doi-asserted-by":"crossref","first-page":"295","DOI":"10.1007\/BF03343726","article-title":"Osteopenia in insulin-dependent diabetes mellitus; 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