1
|
Franco RAG, McKenna E, Robey PG, Crawford RW, Doran MR, Futrega K. SP7 gene silencing dampens bone marrow stromal cell hypertrophy, but it also dampens chondrogenesis. J Tissue Eng 2023; 14:20417314231177136. [PMID: 37362901 PMCID: PMC10288420 DOI: 10.1177/20417314231177136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Accepted: 05/05/2023] [Indexed: 06/28/2023] Open
Abstract
For bone marrow stromal cells (BMSC) to be useful in cartilage repair their propensity for hypertrophic differentiation must be overcome. A single day of TGF-β1 stimulation activates intrinsic signaling cascades in BMSCs which subsequently drives both chondrogenic and hypertrophic differentiation. TGF-β1 stimulation upregulates SP7, a transcription factor known to contribute to hypertrophic differentiation, and SP7 remains upregulated even if TGF-β1 is subsequently withdrawn from the chondrogenic induction medium. Herein, we stably transduced BMSCs to express an shRNA designed to silence SP7, and assess the capacity of SP7 silencing to mitigate hypertrophy. SP7 silencing dampened both hypertrophic and chondrogenic differentiation processes, resulting in diminished microtissue size, impaired glycosaminoglycan production and reduced chondrogenic and hypertrophic gene expression. Thus, while hypertrophic features were dampened by SP7 silencing, chondrogenic differentation was also compromised. We further investigated the role of SP7 in monolayer osteogenic and adipogenic cultures, finding that SP7 silencing dampened characteristic mineralization and lipid vacuole formation, respectively. Overall, SP7 silencing affects the trilineage differentiation of BMSCs, but is insufficient to decouple BMSC hypertrophy from chondrogenesis. These data highlight the challenge of promoting BMSC chondrogenesis whilst simultaneously reducing hypertrophy in cartilage tissue engineering strategies.
Collapse
Affiliation(s)
- Rose Ann G Franco
- School of Mechanical, Medical and Process Engineering, Faculty of Engineering, Queensland University of Technology (QUT), Brisbane, QLD, Australia
- Translational Research Institute (TRI), Brisbane, QLD, Australia
- Center for Biomedical Technologies, Faculty of Engineering, Queensland University of Technology (QUT), Brisbane, QLD, Australia
| | - Eamonn McKenna
- School of Mechanical, Medical and Process Engineering, Faculty of Engineering, Queensland University of Technology (QUT), Brisbane, QLD, Australia
- Translational Research Institute (TRI), Brisbane, QLD, Australia
- Center for Biomedical Technologies, Faculty of Engineering, Queensland University of Technology (QUT), Brisbane, QLD, Australia
| | - Pamela G Robey
- Skeletal Biology Section (SBS), National Institute of Dental and Craniofacial Research (NIDCR), National Institutes of Health (NIH), Department of Health and Human Services (DHHS), Bethesda, MD, USA
| | - Ross W Crawford
- School of Mechanical, Medical and Process Engineering, Faculty of Engineering, Queensland University of Technology (QUT), Brisbane, QLD, Australia
- Center for Biomedical Technologies, Faculty of Engineering, Queensland University of Technology (QUT), Brisbane, QLD, Australia
| | - Michael R Doran
- Translational Research Institute (TRI), Brisbane, QLD, Australia
- Center for Biomedical Technologies, Faculty of Engineering, Queensland University of Technology (QUT), Brisbane, QLD, Australia
- Skeletal Biology Section (SBS), National Institute of Dental and Craniofacial Research (NIDCR), National Institutes of Health (NIH), Department of Health and Human Services (DHHS), Bethesda, MD, USA
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, QLD, Australia
- AstraZeneca, Biologics Engineering, Oncology R&D, One MedImmune Way, Gaithersburg, MD, USA
| | - Kathryn Futrega
- School of Mechanical, Medical and Process Engineering, Faculty of Engineering, Queensland University of Technology (QUT), Brisbane, QLD, Australia
- Translational Research Institute (TRI), Brisbane, QLD, Australia
- Center for Biomedical Technologies, Faculty of Engineering, Queensland University of Technology (QUT), Brisbane, QLD, Australia
- Skeletal Biology Section (SBS), National Institute of Dental and Craniofacial Research (NIDCR), National Institutes of Health (NIH), Department of Health and Human Services (DHHS), Bethesda, MD, USA
| |
Collapse
|