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Dai A, Ben Amar M. Cyclic muscle contractions reinforce the actomyosin motors and mediate the full elongation of C. elegans embryo. eLife 2024; 12:RP90505. [PMID: 38900560 PMCID: PMC11189629 DOI: 10.7554/elife.90505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/21/2024] Open
Abstract
The paramount importance of mechanical forces in morphogenesis and embryogenesis is widely recognized, but understanding the mechanism at the cellular and molecular level remains challenging. Because of its simple internal organization, Caenorhabditis elegans is a rewarding system of study. As demonstrated experimentally, after an initial period of steady elongation driven by the actomyosin network, muscle contractions operate a quasi-periodic sequence of bending, rotation, and torsion, that leads to the final fourfold size of the embryos before hatching. How actomyosin and muscles contribute to embryonic elongation is investigated here theoretically. A filamentary elastic model that converts stimuli generated by biochemical signals in the tissue into driving forces, explains embryonic deformation under actin bundles and muscle activity, and dictates mechanisms of late elongation based on the effects of energy conversion and dissipation. We quantify this dynamic transformation by stretches applied to a cylindrical structure that mimics the body shape in finite elasticity, obtaining good agreement and understanding of both wild-type and mutant embryos at all stages.
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Affiliation(s)
- Anna Dai
- Laboratoire de Physique de l’Ecole normale supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université Paris CitéParisFrance
| | - Martine Ben Amar
- Laboratoire de Physique de l’Ecole normale supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université Paris CitéParisFrance
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Zhang J, Wang Z, Zhang D, Chen Q, Xu J, Tang L, Luo J, Mai Q, Lu X, Tan L, Gan N, Jiang Q. Development of a precision tumor bone metastasis model by a magnetic micro-living-motor system. Colloids Surf B Biointerfaces 2024; 238:113877. [PMID: 38615390 DOI: 10.1016/j.colsurfb.2024.113877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 03/12/2024] [Accepted: 03/23/2024] [Indexed: 04/16/2024]
Abstract
An ideal bone metastasis animal model is critical and fundamental for mechanistic research and following development of new drug and treatment. Caudal artery (CA) injection allows bone metastasis in the hindlimb, while in-depth targeted and quantitative studies of bone metastasis require a new model to overcome its limitations. Here, we developed a targeted, quantitative, and highly consistent method for the modeling of bone metastasis with cell-based magnetic micro-living-motor (MLM) system created by effectively combining Fe3O4-PDA-Au with biosafety. The MLM system can achieve efficient migration, target site colonization and control tumorigenesis in bone precisely with the application of a magnetic field. In vivo, day 3 post cell injection, tumor bone metastasis signals were observed locally in the injected femur among 82.76% mice of the MLM group as compared to the 56.82% in the CA group, and the signal intensity was 45.1 and 95.9 times stronger than that in the left and right lower limbs of the CA group, respectively. Post-injection day 28, metastasis in vital organs was reduced by approximately 90% in the MLM group compared to the CA group. Our innovative use of the MLM system in the field of tumor modeling opens a new avenue for exploring the mechanisms of tumor bone metastasis, recurrence and drug resistance.
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Affiliation(s)
- Jialu Zhang
- Department of Haematology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Zhengyuan Wang
- Department of Haematology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Dingyi Zhang
- Department of Haematology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Qiyan Chen
- Department of Haematology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Jiawei Xu
- School of the first Clinical Medicine, Southern Medical University, Guangzhou, China
| | - Luxia Tang
- School of the first Clinical Medicine, Southern Medical University, Guangzhou, China
| | - Jinyan Luo
- School of the first Clinical Medicine, Southern Medical University, Guangzhou, China
| | - Qiusui Mai
- Department of Transfusion Medicine, School of Laboratory and Biotechnology, Southern Medical University, Guangzhou, China
| | - Xia Lu
- School of the first Clinical Medicine, Southern Medical University, Guangzhou, China
| | - Leyi Tan
- School of the first Clinical Medicine, Southern Medical University, Guangzhou, China
| | - Ning Gan
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, School of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, China.
| | - Qianli Jiang
- Department of Haematology, Nanfang Hospital, Southern Medical University, Guangzhou, China; Clinical Pharmacy Center, Nanfang Hospital, Southern Medical University, Guangzhou, China.
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Ramos Docampo MA, Hovorka O, Städler B. Magnetic micromotors crossing lipid membranes. NANOSCALE 2024; 16:2432-2443. [PMID: 38226699 DOI: 10.1039/d3nr05462d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2024]
Abstract
Nano/micromotors are self-propelled particles that show enhanced motion upon being triggered by a stimulus. Their use in nanomedicine has been widely explored, with special focus on imaging or drug delivery. However, a thorough understanding of the requirements for more efficient locomotion is still lacking. In this paper, we assembled magnetically propelled motors of different sizes (i.e., 0.5, 1 and 4 μm) and surface chemistries (positive charge or PEGylated) and assessed their motion in the presence of giant unilamellar lipid vesicles (GUVs) of varying compositions (zwitterionic, negatively charged and saturated lipids). Unexpectedly, the size does not seem to be the dominating characteristics that governs the ability of the motors to cross lipid membranes. Specifically, the 0.5 μm PEGylated motors have very limited ability to cross the lipid membrane of GUVs due to their non-interacting nature compared to their equally sized positively charged counterparts. Furthermore, membranes made of saturated lipids and, in particular, in combination with a weak magnetic field facilitate motors' crossing, regardless of their size. The results were validated by in-house data-driven statistical analysis that employs experimental data to allow for the identification of individual motor motion in the ensemble when meeting the lipid membranes. Altogether, we provide insight into motor locomotion when they interact with a biological barrier considering both the entire ensemble and the individual motors, which has the potential to support considerations of future motor designs.
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Affiliation(s)
- Miguel A Ramos Docampo
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus, Denmark.
| | - Ondrej Hovorka
- Faculty of Engineering and Physical Sciences, University of Southampton, SO16 7QF, Southampton, UK
| | - Brigitte Städler
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus, Denmark.
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Reversed spin of a ratchet motor on a vibrating water bed. Sci Rep 2022; 12:14141. [PMID: 35986049 PMCID: PMC9391431 DOI: 10.1038/s41598-022-18423-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 08/10/2022] [Indexed: 11/17/2022] Open
Abstract
A ratchet gear on a vibrating water bed exhibits a one-way spin. However, the spinning direction is opposite to that of the gear placed on the granular bed. The one-way spin is caused by the surface waves of water. Surface deformation causes transportation of the water element to rotate the gear. The spatial symmetry of the surface wave and gear geometry regulates the rotational torque. In this study, the same ratchet shows reversed motion between the granular and water beds, and the direction is not determined only by the ratchet geometry. The self-organization of the fluid medium caused by small agitation induces a nontrivial inversion of the spinning direction.
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