Taurine transporter is expressed in osteoblasts

Amino Acids. 2006 Sep;31(2):157-63. doi: 10.1007/s00726-005-0313-7. Epub 2006 May 26.


Taurine influences bone metabolism and is taken up by cells via a specific transport system, the taurine transporter (TAUT). We report a link between taurine and bone homeostasis by demonstrating transcription and translation of TAUT in bone-forming cells. TAUT was expressed in human primary osteoblasts, the human osteosarcoma osteoblast-like cell line MG63, and the mouse osteoblastic cell line MC3T3-E1. Immunostaining with polyclonal antibodies also demonstrated the presence of TAUT in both human and murine osteoblasts. TAUT mRNA expression and [(3)H]taurine uptake increased during differentiation of MG63 cells in culture. Supplementation of culture medium with taurine enhanced alkaline phosphatase activity and osteocalcin secretion. The regulation and detailed function of taurine and TAUT in bone remain unclear, but our findings suggest a functional role for them in bone homeostasis.

MeSH terms

  • 3T3 Cells
  • Alkaline Phosphatase / metabolism
  • Animals
  • Base Sequence
  • Blotting, Western
  • Cell Differentiation
  • DNA Primers
  • Homeostasis
  • Humans
  • Immunohistochemistry
  • Membrane Glycoproteins / genetics
  • Membrane Glycoproteins / metabolism*
  • Membrane Transport Proteins / genetics
  • Membrane Transport Proteins / metabolism*
  • Mice
  • Osteoblasts / enzymology
  • Osteoblasts / metabolism*
  • Osteocalcin / metabolism
  • RNA, Messenger / genetics
  • Reverse Transcriptase Polymerase Chain Reaction


  • DNA Primers
  • Membrane Glycoproteins
  • Membrane Transport Proteins
  • RNA, Messenger
  • Osteocalcin
  • taurine transporter
  • Alkaline Phosphatase