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Wang SM, He X, Li N, Yu F, Hu Y, Wang LS, Zhang P, Du YK, Du SS, Yin ZF, Wei YR, Mulet X, Coia G, Weng D, He JH, Wu M, Li HP. A novel nanobody specific for respiratory surfactant protein A has potential for lung targeting. Int J Nanomedicine 2015; 10:2857-69. [PMID: 25926731 PMCID: PMC4403696 DOI: 10.2147/ijn.s77268] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Lung-targeting drugs are thought to be potential therapies of refractory lung diseases by maximizing local drug concentrations in the lung to avoid systemic circulation. However, a major limitation in developing lung-targeted drugs is the acquirement of lung-specific ligands. Pulmonary surfactant protein A (SPA) is predominantly synthesized by type II alveolar epithelial cells, and may serve as a potential lung-targeting ligand. Here, we generated recombinant rat pulmonary SPA (rSPA) as an antigen and immunized an alpaca to produce two nanobodies (the smallest naturally occurring antibodies) specific for rSPA, designated Nb6 and Nb17. To assess these nanobodies’ potential for lung targeting, we evaluated their specificity to lung tissue and toxicity in mice. Using immunohistochemistry, we demonstrated that these anti-rSPA nanobodies selectively bound to rat lungs with high affinity. Furthermore, we intravenously injected fluorescein isothiocyanate-Nb17 in nude mice and observed its preferential accumulation in the lung to other tissues, suggesting high affinity of the nanobody for the lung. Studying acute and chronic toxicity of Nb17 revealed its safety in rats without causing apparent histological alterations. Collectively, we have generated and characterized lung-specific nanobodies, which may be applicable for lung drug delivery.
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Affiliation(s)
- Shan-Mei Wang
- Department of Respiratory Medicine, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, People's Republic of China
| | - Xian He
- School of Medicine, Suzhou University, SuZhou, People's Republic of China
| | - Nan Li
- Department of Respiratory Medicine, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, People's Republic of China
| | - Feng Yu
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Tongji University, Shanghai, People's Republic of China
| | - Yang Hu
- Department of Respiratory Medicine, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, People's Republic of China
| | - Liu-Sheng Wang
- Department of Respiratory Medicine, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, People's Republic of China
| | - Peng Zhang
- Department of Chest Surgery, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, People's Republic of China
| | - Yu-Kui Du
- Department of Respiratory Medicine, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, People's Republic of China
| | - Shan-Shan Du
- Department of Respiratory Medicine, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, People's Republic of China
| | - Zhao-Fang Yin
- Department of Respiratory Medicine, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, People's Republic of China
| | - Ya-Ru Wei
- Department of Respiratory Medicine, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, People's Republic of China
| | - Xavier Mulet
- CSIRO (Commonwealth Scientific and Industrial Research) Materials Science and Engineering, Clayton
| | - Greg Coia
- CSIRO Materials Science and Engineering, Parkville, Melbourne, VIC, Australia
| | - Dong Weng
- Department of Respiratory Medicine, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, People's Republic of China
| | - Jian-Hua He
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Tongji University, Shanghai, People's Republic of China
| | - Min Wu
- Department of Basic Sciences, University of North Dakota, Grand Forks, ND, USA
| | - Hui-Ping Li
- Department of Respiratory Medicine, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, People's Republic of China
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