Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG, SPINTEC, 38000 Grenoble, France.
Univ. Grenoble Alpes, CEA, Leti, 38000 Grenoble, France.
Nanoscale. 2022 Sep 22;14(36):13274-13283. doi: 10.1039/d2nr02009b.
Diabetes is a major global health threat. Both academics and industry are striving to develop effective treatments for this disease. In this work, we present a new approach to induce insulin release from β-islet pancreatic cells (INS-1E) by mechanical stimulation. Two types of experiments were carried out. First, a local stimulation was performed by dispersing anisotropic magnetic particles within the cell medium, which settled down almost immediately on cell plasma membranes. Application of a low frequency magnetic field (up to 40 Hz) generated by a custom-made magnetic device resulted in oscillations of these particles, which then exerted a mechanical constraint on the cell plasma membranes. The second type of experiment consisted of a global stimulation, where cells were grown on magneto-elastic membranes composed of a biocompatible polymer with embedded magnetic particles. Upon application of a rotating magnetic field, magnetic particles within the membrane were attracted towards the field source, resulting in the membrane's vibrations being transmitted to the cells grown on it. In both experiments, the cell response to these mechanical stimulations caused by application of the variable magnetic field was quantified the measurement of insulin release in the growth medium. We demonstrated that the mechanical action induced by the motion of magnetic particles or by membrane vibrations was an efficient stimulus for insulin granule secretion from β-cells. This opens a wide range of possible applications including the design of a system which triggers insulin secretion by β-islet pancreatic cells on demand.
糖尿病是一个全球性的主要健康威胁。学术界和工业界都在努力开发治疗这种疾病的有效方法。在这项工作中,我们提出了一种通过机械刺激从β胰岛胰腺细胞(INS-1E)诱导胰岛素释放的新方法。进行了两种类型的实验。首先,通过在细胞培养基中分散各向异性磁性颗粒来进行局部刺激,这些颗粒几乎立即沉淀在细胞膜上。应用由定制的磁性装置产生的低频磁场(高达 40 Hz)会导致这些颗粒的振荡,从而对细胞膜施加机械约束。第二种类型的实验包括全局刺激,其中细胞生长在由具有嵌入式磁性颗粒的生物相容性聚合物组成的磁弹性膜上。当施加旋转磁场时,膜内的磁性颗粒被吸引到磁场源,导致膜的振动传递到生长在其上的细胞。在这两种实验中,通过应用可变磁场来测量胰岛素在生长培养基中的释放量来定量评估细胞对这些机械刺激的反应。我们证明,由磁性颗粒的运动或膜振动引起的机械作用是β细胞胰岛素颗粒分泌的有效刺激。这开辟了广泛的可能应用,包括设计按需触发β胰岛胰腺细胞胰岛素分泌的系统。
Nanoscale Adv. 2024-11-12