Biomaterial Database

α2β1 integrin and RhoA mediates electric field-induced ligament fibroblast migration directionality. 2013

Cheng-Hsien Tsai, and Bo-Jiang Lin, and Pen-Hsiu Grace Chao

Institute of Biomedical Engineering, College of Engineering and College of Medicine, National Taiwan University, Taipei, Taiwan.

Guided cell migration is important in tissue development, repair, and engineering. We have previously demonstrated that applied electric fields (EFs) enhanced and directed ligament fibroblast migration and collagen production, depending on EF parameters. Electrical stimulation is widely used for the treatment of pain and to promote wound healing. In orthopaedic practices, applied EFs promote bone healing and ligament repair in vivo. In the current study, stimulation waveforms used in physical therapy for promoting tissue repair were adapted to examine their effects on ACL fibroblast migration. Using different waveform and field strengths, we discovered a decoupling of cell motility and directionality, which suggests disparate mechanisms. Integrin, a major extracellular matrix receptor, polarized in response to applied EFs and controlled cell directionality and signaling. Furthermore, we demonstrated that RhoA is a mediator between integrin aggregation and directed cell migration. Polarization is essential in directed cell migration and our study establishes an outside-in signaling mechanism for EF-induced cell directionality.

UI	MeSH Term	Description	Entries
D002465	Cell Movement	The movement of cells from one location to another. Distinguish from CYTOKINESIS which is the process of dividing the CYTOPLASM of a cell.	Cell Migration,Locomotion, Cell,Migration, Cell,Motility, Cell,Movement, Cell,Cell Locomotion,Cell Motility,Cell Movements,Movements, Cell
D004558	Electric Stimulation	Use of electric potential or currents to elicit biological responses.	Stimulation, Electric,Electrical Stimulation,Electric Stimulations,Electrical Stimulations,Stimulation, Electrical,Stimulations, Electric,Stimulations, Electrical
D005347	Fibroblasts	Connective tissue cells which secrete an extracellular matrix rich in collagen and other macromolecules.	Fibroblast
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D013552	Swine	Any of various animals that constitute the family Suidae and comprise stout-bodied, short-legged omnivorous mammals with thick skin, usually covered with coarse bristles, a rather long mobile snout, and small tail. Included are the genera Babyrousa, Phacochoerus (wart hogs), and Sus, the latter containing the domestic pig (see SUS SCROFA).	Phacochoerus,Pigs,Suidae,Warthogs,Wart Hogs,Hog, Wart,Hogs, Wart,Wart Hog
D014945	Wound Healing	Restoration of integrity to traumatized tissue.	Healing, Wound,Healings, Wound,Wound Healings
D016118	Anterior Cruciate Ligament	A strong ligament of the knee that originates from the posteromedial portion of the lateral condyle of the femur, passes anteriorly and inferiorly between the condyles, and attaches to the depression in front of the intercondylar eminence of the tibia.	Cruciate Ligament, Anterior,Anterior Cranial Cruciate Ligament,Cranial Cruciate Ligament,Anterior Cruciate Ligaments,Cranial Cruciate Ligaments,Cruciate Ligament, Cranial,Cruciate Ligaments, Anterior,Cruciate Ligaments, Cranial,Ligament, Anterior Cruciate,Ligament, Cranial Cruciate,Ligaments, Anterior Cruciate,Ligaments, Cranial Cruciate
D016764	Cell Polarity	Orientation of intracellular structures especially with respect to the apical and basolateral domains of the plasma membrane. Polarized cells must direct proteins from the Golgi apparatus to the appropriate domain since tight junctions prevent proteins from diffusing between the two domains.	Cell Polarities,Polarities, Cell,Polarity, Cell
D020742	rhoA GTP-Binding Protein	A RHO GTP-BINDING PROTEIN involved in regulating signal transduction pathways that control assembly of focal adhesions and actin stress fibers. This enzyme was formerly listed as EC 3.6.1.47.	ARHA GTP-Binding Protein,rho12 GTP-Binding Protein,Ras Homolog Family Member A,V14rho,V14rhoA,rho12 Protein,rhoA P21 Protein,rhoA Protein,ARHA GTP Binding Protein,GTP-Binding Protein, ARHA,GTP-Binding Protein, rho12,GTP-Binding Protein, rhoA,rho12 GTP Binding Protein,rhoA GTP Binding Protein
D038982	Integrin alpha2beta1	An integrin found on fibroblasts, platelets, endothelial and epithelial cells, and lymphocytes where it functions as a receptor for COLLAGEN and LAMININ. Although originally referred to as the collagen receptor, it is one of several receptors for collagen. Ligand binding to integrin alpha2beta1 triggers a cascade of intracellular signaling, including activation of p38 MAP kinase.	CD49b-CD29,Glycoprotein Ia-IIa,Platelet Membrane Glycoprotein Heterodimer Ia-IIa,VLA-2,Very Late Antigen-2,alpha2beta1Integrin,CD49b CD29,Glycoprotein Ia IIa,Late Antigen-2, Very,Platelet Membrane Glycoprotein Heterodimer Ia IIa,VLA 2,Very Late Antigen 2,alpha2beta1, Integrin