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Liu SS, White JM, Chao Z, Li R, Wen S, Garza A, Tang W, Ma X, Chen P, Daniel S, Bates FS, Yeo J, Calabrese MA, Yang R. A Pseudo-Surfactant Chemical Permeation Enhancer to Treat Otitis Media via Sustained Transtympanic Delivery of Antibiotics. Adv Healthc Mater 2024:e2400457. [PMID: 38738584 DOI: 10.1002/adhm.202400457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 05/08/2024] [Indexed: 05/14/2024]
Abstract
Chemical permeation enhancers (CPEs) represent a prevalent and safe strategy to enable noninvasive drug delivery across skin-like biological barriers such as the tympanic membrane (TM). While most existing CPEs interact strongly with the lipid bilayers in the stratum corneum to create defects as diffusion paths, their interactions with the delivery system, such as polymers forming a hydrogel, can compromise gelation, formulation stability, and drug diffusion. To overcome this challenge, differing interactions between CPEs and the hydrogel system are explored, especially those with sodium dodecyl sulfate (SDS), an ionic surfactant and a common CPE, and those with methyl laurate (ML), a nonionic counterpart with a similar length alkyl chain. Notably, the use of ML effectively decouples permeation enhancement from gelation, enabling sustained delivery across TMs to treat acute otitis media (AOM), which is not possible with the use of SDS. Ciprofloxacin and ML are shown to form a pseudo-surfactant that significantly boosts transtympanic permeation. The middle ear ciprofloxacin concentration is increased by 70-fold in vivo in a chinchilla AOM model, yielding superior efficacy and biocompatibility than the previous highest-performing formulation. Beyond improved efficacy and biocompatibility, this single-CPE formulation significantly accelerates its progression toward clinical deployment.
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Affiliation(s)
- Sophie S Liu
- Robert F. Smith School of Chemical and Biomolecular Engineering, Cornell University, Olin Hall, Ithaca, NY, 14850, USA
- Meinig School of Biomedical Engineering, Cornell University, Weill Hall, Ithaca, NY, 14850, USA
| | - Joanna M White
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave., Minneapolis, MN, 55455, USA
| | - Zhongmou Chao
- Robert F. Smith School of Chemical and Biomolecular Engineering, Cornell University, Olin Hall, Ithaca, NY, 14850, USA
| | - Ruye Li
- Department of Chemistry and Chemical Biology, Cornell University, Baker Laboratory, Ithaca, NY, 14850, USA
| | - Shuxian Wen
- Robert F. Smith School of Chemical and Biomolecular Engineering, Cornell University, Olin Hall, Ithaca, NY, 14850, USA
| | - Ally Garza
- Department of Health and Biomedical Sciences, University of Texas Rio Grande Valley 1201 W University Drive, Edinburg, TX, 78539, USA
| | - Wenjing Tang
- Robert F. Smith School of Chemical and Biomolecular Engineering, Cornell University, Olin Hall, Ithaca, NY, 14850, USA
| | - Xiaojing Ma
- Robert F. Smith School of Chemical and Biomolecular Engineering, Cornell University, Olin Hall, Ithaca, NY, 14850, USA
| | - Pengyu Chen
- Robert F. Smith School of Chemical and Biomolecular Engineering, Cornell University, Olin Hall, Ithaca, NY, 14850, USA
| | - Susan Daniel
- Robert F. Smith School of Chemical and Biomolecular Engineering, Cornell University, Olin Hall, Ithaca, NY, 14850, USA
| | - Frank S Bates
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave., Minneapolis, MN, 55455, USA
| | - Jingjie Yeo
- Sibley School of Mechanical and Aerospace Engineering, Cornell University, Upson Hall, Ithaca, NY, 14850, USA
| | - Michelle A Calabrese
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave., Minneapolis, MN, 55455, USA
| | - Rong Yang
- Robert F. Smith School of Chemical and Biomolecular Engineering, Cornell University, Olin Hall, Ithaca, NY, 14850, USA
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White JM, Garza A, Griebler JJ, Bates FS, Calabrese MA. Engineering the Structure and Rheological Properties of P407 Hydrogels via Reverse Poloxamer Addition. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:5084-5094. [PMID: 36971824 PMCID: PMC10593112 DOI: 10.1021/acs.langmuir.3c00088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Aqueous solutions of poloxamer 407 (P407), a commercially available and nontoxic ABA triblock polymer (PEO-PPO-PEO), undergo a solution-to-gel transition with increasing temperature and are promising candidates for injectable therapeutics. The gel transition temperature, modulus, and structure are all dictated by polymer concentration, preventing independent tuning of these properties. Here, we show that addition of BAB reverse poloxamers (RPs) to P407-based solutions dramatically alters the gelation temperature, modulus, and morphology. Gelation temperature and RP localization within the hydrogel are dictated by RP solubility. Highly soluble RPs increase gelation temperature and incorporate primarily into the micelle corona regions. Alternatively, RPs with low aqueous solubility decrease gelation temperature and associate within the micelle core and core-corona interface. These differences in RP localization have significant implications for the hydrogel modulus and microstructure. The ability to tune gelation temperature, modulus, and structure through RP addition allows for the design of thermoresponsive materials with specific properties that are unobtainable with neat P407-based hydrogels.
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Affiliation(s)
- Joanna M White
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave SE, Minneapolis, Minnesota 55455, United States
| | - Ally Garza
- Department of Health and Biomedical Sciences, University of Texas Rio Grande Valley 1201 W University Drive, Edinburg, Texas 78539, United States
| | - James J Griebler
- Department of Chemical and Biomolecular Engineering, University of Illinois Urbana-Champaign, 600 S Mathews Ave, Urbana, Illinois 61801, United States
| | - Frank S Bates
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave SE, Minneapolis, Minnesota 55455, United States
| | - Michelle A Calabrese
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave SE, Minneapolis, Minnesota 55455, United States
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White JM, Calabrese MA. Impact of small molecule and reverse poloxamer addition on the micellization and gelation mechanisms of poloxamer hydrogels. Colloids Surf A Physicochem Eng Asp 2022; 638. [PMID: 35221534 PMCID: PMC8880963 DOI: 10.1016/j.colsurfa.2021.128246] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Poloxamer 407 (P407) is widely used for targeted drug-delivery because it exhibits thermoresponsive gelation behavior near body temperature, stemming from a disorder-to-order transition. Hydrophobic small molecules can be encapsulated within P407; however, these additives often negatively impact the rheological properties and lower the gelation temperatures of the hydrogels, limiting their clinical utility. Here we investigate the impact of adding two BAB reverse poloxamers (RPs), 25R4 and 31R1, on the thermal transitions, rheological properties, and assembled structures of P407 both with and without incorporated small molecules. By employing a combination of differential scanning calorimetry (DSC), rheology, and small-angle x-ray scattering (SAXS), we determine distinct mechanisms for RP incorporation. While 25R4 addition promotes inter-micelle bridge formation, the highly hydrophobic 31R1 co-micellizes with P407. Small molecule addition lowers thermal transition temperatures and increases the micelle size, while RP addition mitigates the decreases in modulus traditionally associated with small molecule incorporation. This fundamental understanding yields new strategies for tuning the mechanical and structural properties of the hydrogels, enabling design of drug-loaded formulations with ideal thermal transitions for a range of clinical applications.
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Affiliation(s)
- Joanna M White
- University of Minnesota, 421 Washington Ave SE, Minneapolis, 55455, MN, USA
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Patel V, Ray D, Bahadur A, Ma J, Aswal VK, Bahadur P. Pluronic ®-bile salt mixed micelles. Colloids Surf B Biointerfaces 2018; 166:119-126. [PMID: 29554645 DOI: 10.1016/j.colsurfb.2018.03.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 02/21/2018] [Accepted: 03/01/2018] [Indexed: 11/28/2022]
Abstract
The present study was aimed to examine the interaction of two bile salts viz. sodium cholate (NaC) and sodium deoxycholate (NaDC) with three ethylene polyoxide-polypropylene polyoxide (PEO-PPO-PEO) triblock copolymers with similar PPO but varying PEO micelles with a focus on the effect of pH on mixed micelles. Mixed micelles of moderately hydrophobic Pluronic® P123 were examined in the presence of two bile salts and compared with those from very hydrophobic L121 and very hydrophilic F127. Both the bile salts increase the cloud point (CP) of copolymer solution and decreased apparent micelle hydrodynamic diameter (Dh). SANS study revealed that P123 forms small spherical micelles showing a decrease in size on progressive addition of bile salts. The negatively charged mixed micelles contained fewer P123 molecules but progressively rich in bile salt. NaDC being more hydrophobic displays more pronounced effect than NaC. Interestingly, NaC shows micellar growth in acidic media which has been attributed to the formation of bile acids by protonation of carboxylate ion and subsequent solubilization. In contrast, NaDC showed phase separation at higher concentration. Nuclear Overhauser effect spectroscopy (NOESY) experiments provided information on interaction and location of bile salts in micelles. Results are discussed in terms of hydrophobicity of bile salts and Pluronics® and the site of bile salt in polymer micelles. Proposed molecular interactions are useful to understand more about bile salts which play important role in physiological processes.
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Affiliation(s)
- Vijay Patel
- Department of Chemistry, Jamanaben Narottambhai Motiram Patel Science College, Bharthana (Vesu), Surat, 395017, India.
| | - Debes Ray
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
| | - Anita Bahadur
- Department of Zoology, Sir P.T. Sarvajanik College of Science, Surat, 395001, India.
| | - Junhe Ma
- Department of Chemistry, Ashland Incorporation, Wilmington, DE 19808, USA.
| | - V K Aswal
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
| | - Pratap Bahadur
- Department of Chemistry, Veer Narmad South Gujarat University, Surat, 395007, India.
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Liu C, Mei Q, Zhang J, Kang X, Peng L, Han B, Xue Z, Sang X, Yang X, Wu Z, Li Z, Mo G. CO2as a smart gelator for Pluronic aqueous solutions. Chem Commun (Camb) 2014; 50:14233-6. [DOI: 10.1039/c4cc06623e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Talarico AM, Szerb EI, Ghedini M, Rossi CO. The potential of the F127-water soft system towards selective solubilisation of iridium(III) octahedral complexes. SOFT MATTER 2014; 10:6783-6790. [PMID: 25074753 DOI: 10.1039/c4sm01077a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In order to obtain new functional soft systems for use as templating agents for the construction of functional mesostructured materials, the dynamic ordered soft systems formed by a hydrophilic ionic iridium(III) complex (IrPa) embedded into two different concentration F127-water mixtures have been investigated. To this aim, combined spectral and time-resolved photophysical techniques and rheological methods have been employed. The position of the chromophore inside the micellar, cubic and hexagonal phases of the F127 polymeric neutral surfactant in water was effectively determined. The hydrophilic character of the iridium(III) complex chosen allowed preferential functionalization of the F127 corona in the micellar and cubic phases.
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Affiliation(s)
- Anna Maria Talarico
- LASCAMM CR-INSTM Unità della Calabria, Dipartimento di Chimica e Tecnologie Chimiche - CTC, Università della Calabria, Via P. Bucci Cubo 14C, Arcavacata (CS), 87036, Italy.
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