Abstract
The field of nasal drug delivery gained enormously on interest over the past decade. Performing nasal in vivo studies is expensive and time-consuming, but also unfeasible for an initial high-throughput compound and formulation screening. Therefore, the development of fast and high-throughput in vitro models to screen compounds for their permeability through the nasal epithelium and mucosa is constantly expanding. Yet, the protocols used for nasal in vitro permeability studies are varying, which limits the comparability and reproducibility of generated data. This project aimed to elucidate the influence of different culture and assay parameters of RPMI 2650 cells grown under air–liquid interface (ALI) conditions on the transepithelial electrical resistance (TEER) and apparent permeability (Papp) values of five selected reference compounds, covering the range of low to moderate to high permeability. The influence of the passage number, seeding density, and timepoint of airlift was minimal in our approach, while the substrate pore density had a significant influence on the Papp values of carbamazepine, propranolol, and metoprolol, classified as highly permeable compounds, but not on atenolol and aciclovir. Elevation of the experimental concentration of carbamazepine, propranolol, and metoprolol in the donor compartment had an increasing effect on the Papp values, while prolonging the assay time did not have a significant influence. Based on the results reported here, RPMI 2650 cells cultured under ALI conditions offer the possibility of a standardized high-throughput screening model for small molecules and their formulations for in vitro drug permeation studies to predict and select optimal conditions for their nasal delivery.
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Acknowledgements
We want to thank Patricia Muschong and Manuel Weinheimer for their support, the fruitful discussions, helping us to shape our experiments and reviewing the manuscript. Further, we want to thank Peter Reinhardt and his team for offering us the possibility to use the cell culture facilities, initial cell culture training, the initial organization and logistics support to purchase and cultivate the cell line and proofreading. We also want to thank Anita Wilhelm-Alkubaisi and Yurani Caicedo Zea for the HPLC analysis and compound detection. All are AbbVie employees.
Funding
AbbVie sponsored and funded the study; contributed to the design; participated in the collection, analysis, and interpretation of data and in writing, reviewing and approval of the final publication. L.A.B., K.W., and A.P. are employees or former employees of AbbVie and may own AbbVie stocks. O.M.M. is a Professor at the Ludwig-Maximilians-University and L.A.B.’s doctoral adviser and is an external adviser for AbbVie on unrelated projects.
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The authors of this article include L.A.B., K.W., O.M.M., and A.P. L.A.B. and K.W. are joined first authors of the article, performed the investigations, the validation, discussed the data, did the formal analysis, performed the literature research, and wrote the original draft. L.A.B. conceptualized the project, established the methodology, and implemented all review versions. O.M.M. and A.P. supervised the overall project and reviewed the manuscript.
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Olivia M. Merkel is a Scientific Board Member for Coriolis Pharma GmbH, AMW GmbH, and Carver Biosciences and an Advisor for PARI Pharma GmbH, Boehringer-Ingelheim International GmbH, and AbbVie on unrelated projects. All other authors have no relevant financial or non-financial interests to disclose.
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Barlang, LA., Weinbender, K., Merkel, O.M. et al. Characterization of critical parameters using an air–liquid interface model with RPMI 2650 cells for permeability studies of small molecules. Drug Deliv. and Transl. Res. 14, 1601–1615 (2024). https://doi.org/10.1007/s13346-023-01474-w
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DOI: https://doi.org/10.1007/s13346-023-01474-w