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Background <p>Mesenchymal stromal/stem cells (MSC) may represent the cell-of-origin for sarcoma development. A collection of human MSCs sequentially mutated with an increasing number of oncogenic hits served to recreate a step-wise process of sarcomagenesis. To identify potential protein targets of interest in the MSC-sarcoma transformation process, quantitative mass spectrometry-based (LC–MS/MS) proteomics was performed.</p> Results <p>Among the protein hits identified as significantly regulated in the transformation process, ALDH1A3 and CD99 were selected and further studied. Both ALDH1A3 abundance levels and activity were significantly upregulated in early-phase (immortalized) and fully transformed (sarcoma forming) cells as compared to normal MSCs. Inversely, CD99 total protein and cell-surface abundance levels were downregulated in immortalized and transformed MSCs. Downregulated CD99 was also identified in several human bone and soft tissue sarcoma subtypes.</p> Conclusions <p>Proteomics investigation of a MSC-transformation model of sarcoma has yielded ALDH1A3 and CD99 as potential targets for sarcomagenesis that may contribute to a greater understanding of the disease and the development of novel therapeutic approaches.</p>

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Proteomics analysis of human mesenchymal stromal/stem cell sarcomagenesis model identifies ALDH1A3 and CD99 as potential targets in the transformation process

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月9日

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  • Jonathan M. Gobin,
  • Jun Gao,
  • Veronica Rey,
  • Juan Tornín,
  • Gauri Muradia,
  • Hala Halabi,
  • Clara Bueno,
  • Mercedes Guerrero-Murillo,
  • Belen Lopez-Millan,
  • Pablo Menendez,
  • Michael Rosu-Myles,
  • Rene Rodriguez,
  • Jessie R. Lavoie

摘要

Background

Mesenchymal stromal/stem cells (MSC) may represent the cell-of-origin for sarcoma development. A collection of human MSCs sequentially mutated with an increasing number of oncogenic hits served to recreate a step-wise process of sarcomagenesis. To identify potential protein targets of interest in the MSC-sarcoma transformation process, quantitative mass spectrometry-based (LC–MS/MS) proteomics was performed.

Results

Among the protein hits identified as significantly regulated in the transformation process, ALDH1A3 and CD99 were selected and further studied. Both ALDH1A3 abundance levels and activity were significantly upregulated in early-phase (immortalized) and fully transformed (sarcoma forming) cells as compared to normal MSCs. Inversely, CD99 total protein and cell-surface abundance levels were downregulated in immortalized and transformed MSCs. Downregulated CD99 was also identified in several human bone and soft tissue sarcoma subtypes.

Conclusions

Proteomics investigation of a MSC-transformation model of sarcoma has yielded ALDH1A3 and CD99 as potential targets for sarcomagenesis that may contribute to a greater understanding of the disease and the development of novel therapeutic approaches.