Related Experiment Video
Updated: Jan 21, 2026

Isolation of Human Mesenchymal Stem Cells and their Cultivation on the Porous Bone Matrix
Published on: February 9, 2015
Thrombospondin 1 and 2 regulate mesenchymal progenitor cell fate and matrix organization
Madysen K Hunter1, Sneha Korlakunta1, Neda Vishlaghi1
1Center for Organogenesis, Regeneration and Trauma, University of Texas Southwestern, Dallas, TX, USA.
None:
Thrombospondin 1 and 2 (TSP1 and TSP2) are critical regulators of extracellular matrix (ECM) interactions, influencing cell differentiation and tissue repair. Recent discoveries from our laboratory and others highlight the importance of altered ECM alignment in influencing aberrant mesenchymal progenitor cell (MPC) differentiation and subsequent ectopic bone formation in trauma-induced heterotopic ossification (HO). However, the key regulators of this MPC to ECM interaction have yet to be elucidated. This study uncovers the role of matricellular TSP1 and TSP2 in MPC/ECM interaction as well as HO formation and progression. Using single-cell RNA sequencing, spatial transcriptomics, and in vivo models, we found that TSP1 is upregulated in tissue remodeling macrophages and MPCs at the injury site, while TSP2 is restricted to MPCs surrounding the HO anlagen. TSP1/2 double knockout (DKO) mice exhibited significantly reduced HO volume and disrupted ECM alignment. These findings highlight the crucial roles of TSP1 and TSP2 in musculoskeletal injury repair as well as HO formation and progression, supporting the potential to therapeutically target TSP1 and TSP2 to prevent HO.
Related Concept Videos
Predicting Products: SN1 vs. SN2
With increased substitution on the alkyl halide,...
Fates of Pyruvate
In aerobic organisms, pyruvate is metabolized via the citric acid cycle to produce reduced coenzymes NADH and FADH2. These coenzymes are then oxidized in the electron transport chain to produce ATP and, in the process, regenerate the NAD+ and FAD. As seen in some cell types and organisms, fermentation...
pH Regulation in Cells
Cytosolic pH
Under physiological conditions, the cytosolic pH is slightly more acidic than the extracellular pH. However, cells must prevent further acidification of their cytosol to...
Mesenchymal Stem Cells
The Extracellular Matrix
Master Transcription Regulators

