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Topal T, Kim BC, Villa-Diaz LG, Deng CX, Takayama S, Krebsbach PH. Rapid translocation of pluripotency-related transcription factors by external uniaxial forces. Integr Biol (Camb) 2019; 11:41-52. [PMID: 30809641 PMCID: PMC6428113 DOI: 10.1093/intbio/zyz003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Accepted: 01/22/2019] [Indexed: 11/14/2022]
Abstract
Human embryonic stem cells subjected to a one-time uniaxial stretch for as short as 30-min on a flexible substrate coated with Matrigel experienced rapid and irreversible nuclear-to-cytoplasmic translocation of NANOG and OCT4, but not Sox2. Translocations were directed by intracellular transmission of biophysical signals from cell surface integrins to nuclear CRM1 and were independent of exogenous soluble factors. On E-CADHERIN-coated substrates, presumably with minimal integrin engagement, mechanical strain-induced rapid nuclear-to-cytoplasmic translocation of the three transcription factors. These findings might provide fundamental insights into early developmental processes and may facilitate mechanotransduction-mediated bioengineering approaches to influencing stem cell fate determination.
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Affiliation(s)
- Tuğba Topal
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA
- Biointerfaces Institute, University of Michigan, Ann Arbor, MI, USA
| | - Byoung Choul Kim
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA
- Biointerfaces Institute, University of Michigan, Ann Arbor, MI, USA
- Division of Nano-Bioengineering, Incheon National University, Incheon, Republic of Korea
| | - Luis G Villa-Diaz
- Biointerfaces Institute, University of Michigan, Ann Arbor, MI, USA
- Department of Biologic and Materials Sciences, University of Michigan, Ann Arbor, MI, USA
- Department of Biological Sciences, Oakland University, Rochester, MI, USA
| | - Cheri X Deng
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA
| | - Shuichi Takayama
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA
- Biointerfaces Institute, University of Michigan, Ann Arbor, MI, USA
- Wallace H Coulter Department of Biomedical Engineering, Georgia Institute of Technology & Emory School of Medicine, Atlanta, GA, USA
| | - Paul H Krebsbach
- Biointerfaces Institute, University of Michigan, Ann Arbor, MI, USA
- Department of Biologic and Materials Sciences, University of Michigan, Ann Arbor, MI, USA
- Section of Periodontics, University of California, Los Angeles School of Dentistry, Los Angeles, CA, USA
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Aguayo-Ortiz R, Meza-Cervantez P, Castillo R, Hernández-Campos A, Dominguez L, Yépez-Mulia L. Insights into the Giardia intestinalis enolase and human plasminogen interaction. MOLECULAR BIOSYSTEMS 2018; 13:2015-2023. [PMID: 28770921 DOI: 10.1039/c7mb00252a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Giardia intestinalis is an intestinal parasite that causes diarrhea in humans and animals worldwide. The enolase of G. intestinalis (GiENO) participates in its glycolysis pathway and is abundantly expressed in the parasite cytosol; however, its localization on the surface of trophozoites and cysts has been demonstrated. Enolases from bacteria and parasites can have different functions and are considered moonlighting proteins, for example, as a cell surface plasminogen receptor. In relation to GiENO, no studies have been performed about its possible participation as a plasminogen receptor. In this work, we employed molecular docking and multiscale molecular dynamics (MD) simulations to explore the possible interactions of human plasminogen (HsPLG) with the open and closed GiENO conformations. Our proposed GiENO plasminogen binding site (PLGBs) was identified at Lys266 based on the sequence comparison with bacterial enolase known to act as a plasminogen receptor. Our docking results performed with multiple MD snapshots of the closed GiENO conformation showed that Lys266 preferentially binds to the K5 domain of HsPLG. On the other hand, open GiENO conformations from all-atom and coarse-grained simulations indicated a high preference of the HsPLG K4 domain for lysine residues 186 and 188. Furthermore, we identified a potential N-glycosylation site of GiENO which suggests a possible explanation for the parasite cell surface localization or host mucin oligosaccharide adhesion mechanism. Our study constitutes the first multiscale computational study to explore the plasminogen receptor function of GiENO for its further consideration as a potential therapeutic target for giardiasis treatment.
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Affiliation(s)
- R Aguayo-Ortiz
- Facultad de Química, Departamento de Fisicoquímica, Universidad Nacional Autónoma de México, CDMX, México 04510, Mexico.
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