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Taurine transporter (TauT) is crucial for mesenchymal stromal cell (MSC) function and bone health. Loss of TauT impairs MSC differentiation, bone density, and hematopoietic stem cell support, highlighting taurine uptake

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Area of Science:

  • Bone Biology and Regenerative Medicine
  • Stem Cell Biology
  • Molecular and Cellular Physiology

Background:

  • Mesenchymal stromal cells (MSCs) are vital for bone development, repair, and hematopoietic stem cell (HSC) regulation within the bone marrow microenvironment.
  • The ion-dependent transporter of taurine (TauT), encoded by Slc6a6, is expressed in MSCs, suggesting a role in skeletal homeostasis.
  • Taurine's potential benefits for bone defects in aging populations are noted, but its direct role in osteolineage cells via TauT is unclear.

Purpose of the Study:

  • To investigate the role of taurine transporter (TauT) in mesenchymal stromal cell (MSC) function and osteogenic differentiation.
  • To determine the impact of TauT loss on bone mineral density, bone strength, and hematopoietic stem/progenitor cell support in vivo.
  • To elucidate the molecular mechanisms underlying TauT's influence on MSC fate determination.

Main Methods:

  • Utilized young TauT genetic loss-of-function murine models (knockout mice).
  • Performed in vitro osteogenic differentiation assays on primary human MSCs with SLC6A6 knockdown via shRNA.
  • Conducted single-cell RNA sequencing, RNA sequencing, and co-culture experiments with hematopoietic stem/progenitor populations.

Main Results:

  • TauT loss in mice impaired MSC populations in vivo and osteogenic differentiation in vitro, correlating with decreased bone mineral density and strength.
  • Knockdown of SLC6A6 in human MSCs reduced osteogenic differentiation, confirming taurine uptake's importance in human MSC function.
  • TauT-null MSCs failed to support HSC self-renewal and expansion, showed downregulated Wnt/beta-catenin signaling, reduced oxidative phosphorylation, and increased ROS levels.

Conclusions:

  • Taurine transporter (TauT) is essential for maintaining mesenchymal stromal cell (MSC) populations and regulating their osteogenic differentiation.
  • Impaired Wnt signaling and elevated oxidative stress in TauT-deficient MSCs contribute to defective osteogenesis.
  • Taurine uptake is identified as a critical regulator of MSC maintenance and osteogenic fate, impacting bone health and HSC support.