Rap1 Guanosine Triphosphate Hydrolase (GTPase) Regulates Shear Stress-Mediated Adhesion of Mesenchymal Stromal Cells
Intravenously transplanted mesenchymal stromal cells (MSCs) have been shown to interact with endothelial cells and to migrate to tissues. However, intracellular signals regulating MSC migration are still incompletely understood. Here, we analyzed the role of Rap1 GTPase in the migration of human bon...
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2025-01-01
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| author | Melanie Giesen Erika Fleck Jürgen Scheele Tanja Nicole Hartmann Reinhard Henschler |
| author_facet | Melanie Giesen Erika Fleck Jürgen Scheele Tanja Nicole Hartmann Reinhard Henschler |
| author_sort | Melanie Giesen |
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| description | Intravenously transplanted mesenchymal stromal cells (MSCs) have been shown to interact with endothelial cells and to migrate to tissues. However, intracellular signals regulating MSC migration are still incompletely understood. Here, we analyzed the role of Rap1 GTPase in the migration of human bone marrow-derived MSCs in vitro and in short-term homing in mice in vivo. MSCs expressed both Rap1A and Rap1B mRNAs, which were downregulated after treatment with siRNA against Rap1A and/or B. In a flow chamber model with pre-established human umbilical vein endothelial cells (HUVECs), Rap1A/B downregulated MSCs interacted for longer distances before arrest, indicating adhesion defects. CXCL12-induced adhesion of MSCs on immobilized Vascular Cell Adhesion Molecule (VCAM)-1 was also decreased after the downregulation of Rap1A, Rap1B, or both, as was CXCL12-induced transwell migration. In a competitive murine short-term homing model with i.v. co-injection of Rap1A+B siRNA-treated and control MSCs that were labeled with PKH 26 and PKH 67 fluorescent dyes, the Rap1A+B siRNA-treated MSCs were detected at increased frequencies in blood, liver, and spleen compared to control MSCs. Thus, Rap1 GTPase modulates the adhesion and migration of MSCs in vitro and may increase the bio-availability of i.v.-transplanted MSCs in tissues in a murine model. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
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| spelling | doaj-art-8494687f09504ea5996f06976a21e60b2025-01-24T13:23:38ZengMDPI AGBiology2079-77372025-01-011419610.3390/biology14010096Rap1 Guanosine Triphosphate Hydrolase (GTPase) Regulates Shear Stress-Mediated Adhesion of Mesenchymal Stromal CellsMelanie Giesen0Erika Fleck1Jürgen Scheele2Tanja Nicole Hartmann3Reinhard Henschler4Institute for Transfusion Medicine and Immune Hematology, German Red Cross Blood Donor Service, Clinics of the Goethe University Frankfurt (Main), 60528 Frankfurt am Main, GermanyInstitute for Transfusion Medicine and Immune Hematology, German Red Cross Blood Donor Service, Clinics of the Goethe University Frankfurt (Main), 60528 Frankfurt am Main, GermanyDepartment of Medicine I, Medical Center University of Freiburg and Faculty of Medicine, University of Freiburg, 79106 Freiburg, GermanyDepartment of Medicine I, Medical Center University of Freiburg and Faculty of Medicine, University of Freiburg, 79106 Freiburg, GermanyInstitute for Transfusion Medicine, Medical Faculty, Leipzig University, 04103 Leipzig, GermanyIntravenously transplanted mesenchymal stromal cells (MSCs) have been shown to interact with endothelial cells and to migrate to tissues. However, intracellular signals regulating MSC migration are still incompletely understood. Here, we analyzed the role of Rap1 GTPase in the migration of human bone marrow-derived MSCs in vitro and in short-term homing in mice in vivo. MSCs expressed both Rap1A and Rap1B mRNAs, which were downregulated after treatment with siRNA against Rap1A and/or B. In a flow chamber model with pre-established human umbilical vein endothelial cells (HUVECs), Rap1A/B downregulated MSCs interacted for longer distances before arrest, indicating adhesion defects. CXCL12-induced adhesion of MSCs on immobilized Vascular Cell Adhesion Molecule (VCAM)-1 was also decreased after the downregulation of Rap1A, Rap1B, or both, as was CXCL12-induced transwell migration. In a competitive murine short-term homing model with i.v. co-injection of Rap1A+B siRNA-treated and control MSCs that were labeled with PKH 26 and PKH 67 fluorescent dyes, the Rap1A+B siRNA-treated MSCs were detected at increased frequencies in blood, liver, and spleen compared to control MSCs. Thus, Rap1 GTPase modulates the adhesion and migration of MSCs in vitro and may increase the bio-availability of i.v.-transplanted MSCs in tissues in a murine model.https://www.mdpi.com/2079-7737/14/1/96mesenchymal stromal cellsRap1adhesionintegrinschemokine receptors |
| spellingShingle | Melanie Giesen Erika Fleck Jürgen Scheele Tanja Nicole Hartmann Reinhard Henschler Rap1 Guanosine Triphosphate Hydrolase (GTPase) Regulates Shear Stress-Mediated Adhesion of Mesenchymal Stromal Cells Biology mesenchymal stromal cells Rap1 adhesion integrins chemokine receptors |
| title | Rap1 Guanosine Triphosphate Hydrolase (GTPase) Regulates Shear Stress-Mediated Adhesion of Mesenchymal Stromal Cells |
| title_full | Rap1 Guanosine Triphosphate Hydrolase (GTPase) Regulates Shear Stress-Mediated Adhesion of Mesenchymal Stromal Cells |
| title_fullStr | Rap1 Guanosine Triphosphate Hydrolase (GTPase) Regulates Shear Stress-Mediated Adhesion of Mesenchymal Stromal Cells |
| title_full_unstemmed | Rap1 Guanosine Triphosphate Hydrolase (GTPase) Regulates Shear Stress-Mediated Adhesion of Mesenchymal Stromal Cells |
| title_short | Rap1 Guanosine Triphosphate Hydrolase (GTPase) Regulates Shear Stress-Mediated Adhesion of Mesenchymal Stromal Cells |
| title_sort | rap1 guanosine triphosphate hydrolase gtpase regulates shear stress mediated adhesion of mesenchymal stromal cells |
| topic | mesenchymal stromal cells Rap1 adhesion integrins chemokine receptors |
| url | https://www.mdpi.com/2079-7737/14/1/96 |
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