Optimization of Multimodal Nanoparticles Internalization Process in Mesenchymal Stem Cells for Cell Therapy Studies

Author(s)

Nucci, Mariana P. ; Mamani, Javier B. ; Oliveira, Fernando A. ; Filgueiras, Igor S. ; Alves, Arielly H. ; Theinel, Matheus H. ; Rodrigues, Luiz D. ; Marti, Luciana ; Gamarra, Lionel F.

• Document type: Journal article
• Source: PHARMACEUTICS; v. 14, n. 6, p. 23-pg., 2022-06-01.

Abstract

Considering there are several difficulties and limitations in labeling stem cells using multifunctional nanoparticles (MFNP), the purpose of this study was to determine the optimal conditions for labeling human bone marrow mesenchymal stem cells (hBM-MSC), aiming to monitor these cells in vivo. Thus, this study provides information on hBM-MSC direct labeling using multimodal nanoparticles in terms of concentration, magnetic field, and period of incubation while maintaining these cells' viability and the homing ability for in vivo experiments. The cell labeling process was assessed using 10, 30, and 50 mu g Fe/mL of MFNP, with periods of incubation ranging from 4 to 24 h, with or without a magnetic field, using optical microscopy, near-infrared fluorescence (NIRF), and inductively coupled plasma mass spectrometry (ICP-MS). After the determination of optimal labeling conditions, these cells were applied in vivo 24 h after stroke induction, intending to evaluate cell homing and improve NIRF signal detection. In the presence of a magnetic field and utilizing the maximal concentration of MFNP during cell labeling, the iron load assessed by NIRF and ICP-MS was four times higher than what was achieved before. In addition, considering cell viability higher than 98%, the recommended incubation time was 9 h, which corresponded to a 25.4 pg Fe/cell iron load (86% of the iron load internalized in 24 h). The optimization of cellular labeling for application in the in vivo study promoted an increase in the NIRF signal by 215% at 1 h and 201% at 7 h due to the use of a magnetized field during the cellular labeling process. In the case of BLI, the signal does not depend on cell labeling showing no significant differences between unlabeled or labeled cells (with or without a magnetic field). Therefore, the in vitro cellular optimized labeling process using magnetic fields resulted in a shorter period of incubation with efficient iron load internalization using higher MFNP concentration (50 mu gFe/mL), leading to significant improvement in cell detection by NIRF technique without compromising cellular viability in the stroke model. (AU)

• FAPESP's process: 19/21070-3 - Evaluation of the therapeutic efficacy of physical activity-associated nanoparticle-labeled stem cells in the focal ischemia model
• Grantee: João Victor Matias Ferreira
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 16/21470-3 - Therapeutic action of mesenchymal stem cells from human bone marrow labeled with multimodal nanoparticles in diabetic rats subjected to stroke: study of cellular, molecular and functional mechanisms.
• Grantee: Lionel Fernel Gamarra Contreras
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/17868-4 - Therapeutic action of mesenchymal stem cells of the human bone marrow, marked with multimodal nanoparticles, in diabetic rats submitted to focal cerebral ischemia: study of cellular, molecular and functional mechanisms
• Grantee: Yolanda Oliveira Pinto
• Support Opportunities: Scholarships in Brazil - Scientific Initiation