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Zhang Y, Velasco O, Zhang X, Ting K, Soo C, Wu BM. Bioactivity and circulation time of PEGylated NELL-1 in mice and the potential for osteoporosis therapy. Biomaterials 2014; 35:6614-21. [PMID: 24818884 PMCID: PMC4077898 DOI: 10.1016/j.biomaterials.2014.04.061] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Accepted: 04/16/2014] [Indexed: 12/12/2022]
Abstract
Osteoporosis is a progressive bone disease due to low osteoblast activity and/or high osteoclast activity. NELL-1 is a potential therapy for osteoporosis because it specifically increases osteoblast differentiation. However, similar to other protein drugs, the bioavailability of NELL-1 may be limited by its in vivo half-life and rapid clearance from body. The purpose of the present study is to prolong NELL-1 circulation time in vivo by PEGylation with three monomeric PEG sizes (5, 20, 40 kDa). While linear PEG 5k yielded the most efficient PEGylation and the most thermally stable conjugate, linear PEG 20k resulted in the conjugate with the highest Mw and longest in vivo circulation. Compared to non-modified NELL-1, all three PEGylated conjugates showed enhanced thermal stability and each prolonged the in vivo circulation time significantly. Furthermore, PEGylated NELL-1 retained its osteoblastic activity without any appreciable cytotoxicity. These findings motivate further studies to evaluate the efficacy of PEGylated NELL-1 on the prevention and treatment of osteoporosis.
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Affiliation(s)
- Yulong Zhang
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA 90095, USA; Department of Materials Science and Engineering, and Division of Advanced Prosthodontics, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Omar Velasco
- Weintraub Center for Reconstructive Biotechnology, and Dental and Craniofacial Research Institute, School of Dentistry, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Xinli Zhang
- Weintraub Center for Reconstructive Biotechnology, and Dental and Craniofacial Research Institute, School of Dentistry, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Kang Ting
- Weintraub Center for Reconstructive Biotechnology, and Dental and Craniofacial Research Institute, School of Dentistry, University of California, Los Angeles, Los Angeles, CA 90095, USA; Department of Orthopaedic Surgery, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Chia Soo
- Weintraub Center for Reconstructive Biotechnology, and Dental and Craniofacial Research Institute, School of Dentistry, University of California, Los Angeles, Los Angeles, CA 90095, USA; Department of Orthopaedic Surgery, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Benjamin M Wu
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA 90095, USA; Department of Materials Science and Engineering, and Division of Advanced Prosthodontics, University of California, Los Angeles, Los Angeles, CA 90095, USA; Weintraub Center for Reconstructive Biotechnology, and Dental and Craniofacial Research Institute, School of Dentistry, University of California, Los Angeles, Los Angeles, CA 90095, USA; Department of Orthopaedic Surgery, University of California, Los Angeles, Los Angeles, CA 90095, USA.
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Rebolj K, Pahovnik D, Žagar E. Characterization of a Protein Conjugate Using an Asymmetrical-Flow Field-Flow Fractionation and a Size-Exclusion Chromatography with Multi-Detection System. Anal Chem 2012; 84:7374-83. [DOI: 10.1021/ac3010378] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Katja Rebolj
- National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
| | - David Pahovnik
- National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
| | - Ema Žagar
- National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
- Centre of Excellence for Polymer Materials and Technologies, Tehnološki
park 24, 1000 Ljubljana, Slovenia
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