[HTML][HTML] Glucose metabolism induced by Bmp signaling is essential for murine skeletal development

SY Lee, ED Abel, F Long - Nature communications, 2018 - nature.com
SY Lee, ED Abel, F Long
Nature communications, 2018nature.com
Much of the mammalian skeleton originates from a cartilage template eventually replaced by
bone via endochondral ossification. Despite much knowledge about growth factors and
nuclear proteins in skeletal development, little is understood about the role of metabolic
regulation. Here we report that genetic deletion of the glucose transporter Glut1 (Slc2a1),
either before or after the onset of chondrogenesis in the limb, severely impairs chondrocyte
proliferation and hypertrophy, resulting in dramatic shortening of the limbs. The cartilage …
Abstract
Much of the mammalian skeleton originates from a cartilage template eventually replaced by bone via endochondral ossification. Despite much knowledge about growth factors and nuclear proteins in skeletal development, little is understood about the role of metabolic regulation. Here we report that genetic deletion of the glucose transporter Glut1 (Slc2a1), either before or after the onset of chondrogenesis in the limb, severely impairs chondrocyte proliferation and hypertrophy, resulting in dramatic shortening of the limbs. The cartilage defects are reminiscent to those caused by deficiency in Bmp signaling. Importantly, deletion of Bmpr1a in chondrocytes markedly reduces Glut1 levels in vivo, whereas recombinant BMP2 increases Glut1 mRNA and protein levels, boosting glucose metabolism in primary chondrocytes. Biochemical studies identify a Bmp-mTORC1-Hif1a signaling cascade resulting in upregulation of Glut1 in chondrocytes. The results therefore uncover a hitherto unknown connection between Bmp signaling and glucose metabolism in the regulation of cartilage development.
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