Abstract
Chondrogenic growth factors are promising therapeutic agents for articular cartilage repair. A persistent impediment to fulfilling this promise is a limited ability to apply and retain the growth factors within the region of cartilage damage that is in need of repair. Current therapies successfully deliver cells and/or matrices, but growth factors are subject to diffusion into the joint space and then loss from the joint. To address this problem, we created a novel gene that encodes a bifunctional fusion protein comprised by a matrix binding domain and a growth factor. The gene encodes the hyaluronic acid binding region of the cartilage matrix molecule, versican, and the chondrogenic growth factor, insulin-like growth factor-1 (IGF-1). We delivered the gene in an adeno-associated virus-based plasmid vector to articular chondrocytes. The cells synthesized and secreted the fusion protein gene product. The fusion protein bound to hyaluronic acid and retained the anabolic and mitogenic actions of IGF-1 on the chondrocytes. This proof-of-concept study suggests that the bifunctional fusion protein, in concert with chondrocytes and a hyaluronic acid-based delivery vehicle, may serve as an intra-articular therapy to help achieve articular cartilage repair.
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Abbreviations
- AAV:
-
Adeno-associated virus
- AG1:
-
Aggrecan G1 domain
- AU:
-
Arbitrary unit
- CM:
-
Conditioned medium
- DMB:
-
Dimethylmethlyene blue
- DMEM:
-
Dulbecco’s minimum essential medium
- EDTA:
-
Ethylenediaminetetraacetic acid
- F:
-
Forward primer
- FBS:
-
Fetal bovine serum
- G1:
-
Globular domain 1
- GAG:
-
Glycosaminoglycan
- HA:
-
Hyaluronic acid
- HB-EGF:
-
Heparin-binding epidermal-like growth factor
- HEK-293:
-
Human embryonic kidney 293 cells
- HRP:
-
Horseradish peroxidase
- IGF-1:
-
Insulin-like growth factor-1
- Ka :
-
Equilibrium association constant
- PBS:
-
Phosphate buffered saline
- R:
-
Reverse primer
- SDS:
-
Sodium dodecyl sulfate/sulphate
- TBST:
-
Tris-buffered saline/Tween
- VG1:
-
Versican G1 domain
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Funding
This research was funded in part by the National Institute of Arthritis and Musculoskeletal and Skin Diseases, Grant/Award Number: AR047702; U.S. Department of Veterans Affairs, Grant/Award Number: I01 BX000447; Indiana University School of Medicine Research Infrastructure Fund; and Indiana University Department of Orthopaedic Surgery. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
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Conceptualizaton: SS and ST. Methodology: SS, ST, and CW. Validation: SS, CW and ST. Formal analysis: SS and ST. Investigation: SS and CW. Resources: ST. Writing – original draft: SS and ST. Writing-review & editing: SS, ST, and CW. Visualization: SS. Project administration: SS and ST. Funding acquisition: ST.
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Shi, S., Wang, C. & Trippel, S.B. Hyaluronic acid-binding insulin-like growth factor-1: Creation of a gene encoding a bifunctional fusion protein. Mol Biol Rep 47, 9749–9756 (2020). https://doi.org/10.1007/s11033-020-06034-w
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DOI: https://doi.org/10.1007/s11033-020-06034-w