Searchable abstracts of presentations at key conferences on calcified tissues

ba0003oc1.4 | Phosphate metabolism, fracture repair and osteoarthritis | ECTS2014

Long-term Fgf23 deficiency induces renal and skeletal PTH resistance in vitamin D receptor-ablated mice

Andrukhova Olena , Murali Sathish Kumar , Zeitz Ute , Erben Reinhold G.

Fibroblast growth factor-23 (FGF23) is a hormone originating from osteocytes with suppressive actions on renal phosphate reabsorption and vitamin D synthesis. We recently identified FGF23 as a calcium-conserving hormone, regulating the membrane transport of the epithelial calcium channel TRPV5 in distal renal tubules. Here, we analyzed the long term sequelae of Fgf23 deficiency and renal calcium wasting on bone and mineral metabolism in 9-month-old mice lacking both Fgf23<...

ba0003oc1.3 | Phosphate metabolism, fracture repair and osteoarthritis | ECTS2014

Klotho deficiency impairs mineralization by vitamin D hormone-driven upregulation of osteopontin and pyrophosphate in bone

Murali Sathish Kumar , Roschger Paul , Zeitz Ute , Klaushofer Klaus , Andrukhova Olena , Erben Reinhold G.

Lack of Klotho, the co-receptor for the bone-derived hormone fibroblast growth factor-23 (FGF23), leads to a severe impairment in bone mineralization in mice. However, the mechanisms underlying the Klotho deficiency-associated defects in bone mineralization are still poorly understood. Here, we sought to elucidate the vitamin D independent role of Klotho in bone mineralization. To ablate increased vitamin D signaling in Klotho knockout mice (Kl−/−), we c...