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Bell JA, Mayfield CK, Collon K, Chang S, Gallo MC, Lechtholz-Zey E, Ayad M, Sugiyam O, Tang AH, Park SH, Lieberman JR. In vivo effects of cell seeding technique in an ex vivo regional gene therapy model for bone regeneration. J Biomed Mater Res A 2024. [PMID: 38602243 DOI: 10.1002/jbm.a.37718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 03/14/2024] [Accepted: 03/25/2024] [Indexed: 04/12/2024]
Abstract
When delivering cells on a scaffold to treat a bone defect, the cell seeding technique determines the number and distribution of cells within a scaffold, however the optimal technique has not been established. This study investigated if human adipose-derived stem cells (ASCs) transduced with a lentiviral vector to overexpress bone morphogenetic protein 2 (BMP-2) and loaded on a scaffold using dynamic orbital shaker could reduce the total cell dose required to heal a critical sized bone defect when compared with static seeding. Human ASCs were loaded onto a collagen/biphasic ceramic scaffold using static loading and dynamic orbital shaker techniques, compared with our labs standard loading technique, and implanted into femoral defects of nude rats. Both a low dose and standard dose of transduced cells were evaluated. Outcomes investigated included BMP-2 production, radiographic healing, micro-computerized tomography, histologic assessment, and biomechanical torsional testing. BMP-2 production was higher in the orbital shaker cohort compared with the static seeding cohort. No statistically significant differences were noted in radiographic, histomorphometric, and biomechanical outcomes between the low-dose static and dynamic seeding groups, however the standard-dose static seeding cohort had superior biomechanical properties. The standard-dose 5 million cell dose standard loading cohort had superior maximum torque and torsional stiffness on biomechanical testing. The use of orbital shaker technique was labor intensive and did not provide equivalent biomechanical results with the use of fewer cells.
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Affiliation(s)
- Jennifer A Bell
- Department of Orthopaedic Surgery, Keck School of Medicine of USC, Los Angeles, California, USA
| | - Cory K Mayfield
- Department of Orthopaedic Surgery, Keck School of Medicine of USC, Los Angeles, California, USA
| | - Kevin Collon
- Department of Orthopaedic Surgery, Keck School of Medicine of USC, Los Angeles, California, USA
| | - Stephanie Chang
- Department of Orthopaedic Surgery, Keck School of Medicine of USC, Los Angeles, California, USA
| | - Matthew C Gallo
- Department of Orthopaedic Surgery, Keck School of Medicine of USC, Los Angeles, California, USA
| | - Elizabeth Lechtholz-Zey
- Department of Orthopaedic Surgery, Keck School of Medicine of USC, Los Angeles, California, USA
| | - Mina Ayad
- Department of Orthopaedic Surgery, Keck School of Medicine of USC, Los Angeles, California, USA
| | - Osamu Sugiyam
- Department of Orthopaedic Surgery, Keck School of Medicine of USC, Los Angeles, California, USA
| | - Amy H Tang
- Department of Orthopaedic Surgery, Keck School of Medicine of USC, Los Angeles, California, USA
| | - Sang-Hyun Park
- J. Vernon Luck Orthopaedic Research Center, Orthopaedic Institute for Children, Los Angeles, California, USA
| | - Jay R Lieberman
- Department of Orthopaedic Surgery, Keck School of Medicine of USC, Los Angeles, California, USA
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