The regulation of bone metabolism by amino acid

点击翻译按钮获取中文摘要

Although amino acid transporters are indispensable for a variety of cellular events in eukaryotic cells, little attention has been paid to their functional role in bone modeling and remodeling so far. Here, we have attempted to demonstrate the possible involvement of a system A amino acid transporter Slc38a1 in the regulation of osteoblastogenesis and osteoclastogenesis in vivo. To that end, cell-specific (osteoblast and osteoclast) knockout mice were generated. In vertebrae of those knockout mice, no marked change was seen in bone volume over tissue volume, osteoblastic parameter and osteoclastic parameter compared with wild-type (WT) mice by bone histomorphometric analyses. Moreover, ovariectomy resulted in a marked reduction of vertebrae bone volume in both WT mice and osteoblast-specific Slc38a1 knockout mice.