PMID- 33800701 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20210428 IS - 1999-4923 (Print) IS - 1999-4923 (Electronic) IS - 1999-4923 (Linking) VI - 13 IP - 4 DP - 2021 Mar 28 TI - Oligonucleotide Delivery across the Caco-2 Monolayer: The Design and Evaluation of Self-Emulsifying Drug Delivery Systems (SEDDS). LID - 10.3390/pharmaceutics13040459 [doi] LID - 459 AB - Oligonucleotides (OND) represent a promising therapeutic approach. However, their instability and low intestinal permeability hamper oral bioavailability. Well-established for oral delivery, self-emulsifying drug delivery systems (SEDDS) can overcome the weakness of other delivery systems such as long-term instability of nanoparticles or complicated formulation processes. Therefore, the present study aims to prepare SEDDS for delivery of a nonspecific fluorescently labeled OND across the intestinal Caco-2 monolayer. The hydrophobic ion pairing of an OND and a cationic lipid served as an effective hydrophobization method using either dimethyldioctadecylammonium bromide (DDAB) or 1,2-dioleoyl-3-trimethylammonium propane (DOTAP). This strategy allowed a successful loading of OND-cationic lipid complexes into both negatively charged and neutral SEDDS. Subjecting both complex-loaded SEDDS to a nuclease, the negatively charged SEDDS protected about 16% of the complexed OND in contrast to 58% protected by its neutral counterpart. Furthermore, both SEDDS containing permeation-enhancing excipients facilitated delivery of OND across the intestinal Caco-2 cell monolayer. The negatively charged SEDDS showed a more stable permeability profile over 120 min, with a permeability of about 2 x 10(-7) cm/s, unlike neutral SEDDS, which displayed an increasing permeability reaching up to 7 x 10(-7) cm/s. In conclusion, these novel SEDDS-based formulations provide a promising tool for OND protection and delivery across the Caco-2 cell monolayer. FAU - Kubackova, Jana AU - Kubackova J AUID- ORCID: 0000-0003-2472-6183 AD - Department of Pharmaceutical Technology, Faculty of Pharmacy in Hradec Kralove, Charles University, Akademika Heyrovskeho 1203, 500 05 Hradec Kralove, Czech Republic. FAU - Holas, Ondrej AU - Holas O AUID- ORCID: 0000-0002-8335-0123 AD - Department of Pharmaceutical Technology, Faculty of Pharmacy in Hradec Kralove, Charles University, Akademika Heyrovskeho 1203, 500 05 Hradec Kralove, Czech Republic. FAU - Zbytovska, Jarmila AU - Zbytovska J AD - Department of Pharmaceutical Technology, Faculty of Pharmacy in Hradec Kralove, Charles University, Akademika Heyrovskeho 1203, 500 05 Hradec Kralove, Czech Republic. AD - Faculty of Chemical Technology, University of Chemistry and Technology Prague, Technicka 5, 166 28 Prague, Czech Republic. FAU - Vranikova, Barbora AU - Vranikova B AUID- ORCID: 0000-0002-9824-1923 AD - Department of Pharmaceutical Technology, Faculty of Pharmacy in Hradec Kralove, Charles University, Akademika Heyrovskeho 1203, 500 05 Hradec Kralove, Czech Republic. FAU - Zeng, Guanghong AU - Zeng G AD - DFM A/S (Danish National Metrology Institute), Kogle Alle 5, 2970 Horsholm, Denmark. FAU - Pavek, Petr AU - Pavek P AUID- ORCID: 0000-0001-8769-4196 AD - Department of Pharmacology, Faculty of Pharmacy in Hradec Kralove, Charles University, Akademika Heyrovskeho 1203, 500 05 Hradec Kralove, Czech Republic. FAU - Mullertz, Anette AU - Mullertz A AD - Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark. AD - Bioneer: FARMA, Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark. LA - eng GR - SVV 260 402/Ministerstvo Skolstvi, Mladeze a Telovychovy/ GR - CZ.02.1.01/0.0/0.0/16_019/0000841/European Food Safety Authority/ GR - FM/c/2029-1-011/Univerzita Karlova v Praze/ GR - CA16205/European Cooperation in Science and Technology/ PT - Journal Article DEP - 20210328 PL - Switzerland TA - Pharmaceutics JT - Pharmaceutics JID - 101534003 PMC - PMC8066367 OTO - NOTNLM OT - Caco-2 monolayer OT - hydrophobic ion pairing OT - intestinal permeation enhancers OT - oligonucleotide OT - self-emulsifying drug delivery systems COIS- The authors declare no conflict of interest. EDAT- 2021/04/04 06:00 MHDA- 2021/04/04 06:01 PMCR- 2021/03/28 CRDT- 2021/04/03 01:06 PHST- 2021/02/15 00:00 [received] PHST- 2021/03/23 00:00 [revised] PHST- 2021/03/24 00:00 [accepted] PHST- 2021/04/03 01:06 [entrez] PHST- 2021/04/04 06:00 [pubmed] PHST- 2021/04/04 06:01 [medline] PHST- 2021/03/28 00:00 [pmc-release] AID - pharmaceutics13040459 [pii] AID - pharmaceutics-13-00459 [pii] AID - 10.3390/pharmaceutics13040459 [doi] PST - epublish SO - Pharmaceutics. 2021 Mar 28;13(4):459. doi: 10.3390/pharmaceutics13040459.