Stem cells are unspecialized cells that can self renew indefinitely and differentiate into several somatic cells given the correct environmental cues.In the stem cell niche,stem cell-extracellular matrix(ECM)interacti...Stem cells are unspecialized cells that can self renew indefinitely and differentiate into several somatic cells given the correct environmental cues.In the stem cell niche,stem cell-extracellular matrix(ECM)interactions are crucial for different cellular functions,such as adhesion,proliferation,and differentiation.Recently, in addition to chemical surface modifications,the importance of nanometric scale surface topography and roughness of biomaterials has increasingly becoming recognized as a crucial factor for cell survival and host tissue acceptance in synthetic ECMs.This review describes the influence of nanotopography on stem cell phenotypes.展开更多
Tissue (re)vascularization strategies face various challenges, as therapeutic cells do not survive long enough in situ, while the administration of pro-angiogenic factors is hampered by fast clearance and insufficient...Tissue (re)vascularization strategies face various challenges, as therapeutic cells do not survive long enough in situ, while the administration of pro-angiogenic factors is hampered by fast clearance and insufficient ability to emulate complex spatiotemporal signaling. Here, we propose to address these limitations by engineering a functional biomaterial capable of capturing and concentrating the pro-angiogenic activities of mesenchymal stem cells (MSCs). In particular, dextran sulfate, a high molecular weight sulfated glucose polymer, supplemented to MSC cul-tures, interacts with MSC-derived extracellular matrix (ECM) components and facilitates their co-assembly and accumulation in the pericellular space. Upon decellularization, the resulting dextran sulfate-ECM hybrid material can be processed into MIcroparticles of SOlidified Secretome (MIPSOS). The insoluble format of MIPSOS protects protein components from degradation, while facilitating their sustained release. Proteomic analysis demonstrates that MIPSOS are highly enriched in pro-angiogenic factors, resulting in an enhanced pro-angiogenic bioactivity when compared to naïve MSC-derived ECM (cECM). Consequently, intravital microscopy of full-thickness skin wounds treated with MIPSOS demonstrates accelerated revascularization and healing, far superior to the ther-apeutic potential of cECM. Hence, the microparticle-based solidified stem cell secretome provides a promising platform to address major limitations of current therapeutic angiogenesis approaches.展开更多
基金Supported by The National University of Singapore,Grant No.R-224-000-035-133 and NMRC/1151/2008,Singapore
文摘Stem cells are unspecialized cells that can self renew indefinitely and differentiate into several somatic cells given the correct environmental cues.In the stem cell niche,stem cell-extracellular matrix(ECM)interactions are crucial for different cellular functions,such as adhesion,proliferation,and differentiation.Recently, in addition to chemical surface modifications,the importance of nanometric scale surface topography and roughness of biomaterials has increasingly becoming recognized as a crucial factor for cell survival and host tissue acceptance in synthetic ECMs.This review describes the influence of nanotopography on stem cell phenotypes.
基金Funding support for material synthesis and in vitro work includes a laboratory start-up grant(8508266)from CUHK(AB),a direct grant(2019.016)from the Faculty of Medicine,CUHK(AB)and a grant from the Shun Hing Institute of Advanced Engineering(SHIAE,BME-p5-20,AB)Hong Kong SAR China.R.S.T.would like to acknowledge the Lee Quo Wei and Lee Yick Hoi Lun Professorship in Tissue Engineering and Regenerative Medicine(RST).J.G.and G.G.acknowledge financial support from the National Natural Science Foundation of China(J.G.,No.22178233)+1 种基金the National Global Talents Recruitment Program,the Talents Program of Sichuan Province,State Key Laboratory of Polymer Materials Engineering(Grant No.sklpme 2020-3-01)Key Laboratory of Leather Chemistry and En-gineering,and the National Engineering Research Center of Clean Technology in Leather Industry.The experimental data analyzed by Orbitrap Fusion mass spectrometer were acquired at the Academia Sinica Common Mass Spectrometry Facilities for Proteomics and Protein Modification Analysis located at the Institute of Biological Chemistry,Academia Sinica,supported by Academia Sinica Core Facility and Innovative Instrument Project Grant(AS-CFII-108-107).
文摘Tissue (re)vascularization strategies face various challenges, as therapeutic cells do not survive long enough in situ, while the administration of pro-angiogenic factors is hampered by fast clearance and insufficient ability to emulate complex spatiotemporal signaling. Here, we propose to address these limitations by engineering a functional biomaterial capable of capturing and concentrating the pro-angiogenic activities of mesenchymal stem cells (MSCs). In particular, dextran sulfate, a high molecular weight sulfated glucose polymer, supplemented to MSC cul-tures, interacts with MSC-derived extracellular matrix (ECM) components and facilitates their co-assembly and accumulation in the pericellular space. Upon decellularization, the resulting dextran sulfate-ECM hybrid material can be processed into MIcroparticles of SOlidified Secretome (MIPSOS). The insoluble format of MIPSOS protects protein components from degradation, while facilitating their sustained release. Proteomic analysis demonstrates that MIPSOS are highly enriched in pro-angiogenic factors, resulting in an enhanced pro-angiogenic bioactivity when compared to naïve MSC-derived ECM (cECM). Consequently, intravital microscopy of full-thickness skin wounds treated with MIPSOS demonstrates accelerated revascularization and healing, far superior to the ther-apeutic potential of cECM. Hence, the microparticle-based solidified stem cell secretome provides a promising platform to address major limitations of current therapeutic angiogenesis approaches.
