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Casalini T, Mann J, Pepin X. Predicting Surface pH in Unbuffered Conditions for Acids, Bases, and Their Salts - A Review of Modeling Approaches and Their Performance. Mol Pharm 2024; 21:513-534. [PMID: 38127789 DOI: 10.1021/acs.molpharmaceut.3c00661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
Dissolution of ionizable drugs and their salts is a function of drug surface solubility driven by the surface pH, i.e., the microenvironmental pH at the solid/liquid interface, which will deviate from bulk pH when there is an acid-base reaction occurring at the solid/liquid interface. In this work, we first present a brief overview of the modeling approaches available in the literature, classified according to the rate-determining step assumed in the dissolution process. In the second part, we present and evaluate the prediction performance of two different modeling approaches for surface pH. The first method relies only on thermodynamic equilibria, while the second method accounts for transport phenomena of charged compounds through the diffusional boundary layer using the Nernst - Planck equation. Model outcomes are compared with experimental data taken from the literature and obtained during this work. In terms of surface pH predictions, the models provide identical values for weak acids or weak bases. The models' outcomes for bases are in good agreement with experimental data in acidic conditions (bulk pH 1-4), while overpredictions are observed in the 5-7 bulk pH range in a system-dependent manner. Deviations can be related to the effect of surface dissolution (also referred to as surface reaction), which may become a controlling mechanism and slow the replenishment of the unionized drug at the surface of the crystal. Surface pH predictions for acids are generally in good agreement with experiments, with a slight underestimation for some drug examples, which could be related to errors in intrinsic solubility determination or to the assumption of thermodynamic equilibrium at the surface of the drug. A good agreement is also observed for salts with the thermodynamic model except for mesylate salts, suggesting that other phenomena, not currently included in the thermodynamic equilibrium model, may determine the surface pH.
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Affiliation(s)
- Tommaso Casalini
- Oral Product Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Gothenburg 431 50, Sweden
| | - James Mann
- Oral Product Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Macclesfield SK10 2NA, U.K
| | - Xavier Pepin
- New Modalities & Parenteral Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Macclesfield SK10 2NA, U.K
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2
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Ahmed Z, LoGiudice K, Mays G, Schorr A, Rowey R, Yang H, Trivedi S, Srivastava V. Increasing Chemotherapeutic Efficacy Using pH-Modulating and Doxorubicin-Releasing Injectable Chitosan-Poly(ethylene glycol) Hydrogels. ACS APPLIED MATERIALS & INTERFACES 2023; 15:45626-45639. [PMID: 37729014 DOI: 10.1021/acsami.3c09733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/22/2023]
Abstract
Modulation of pH is crucial to maintaining the chemical homeostasis of biological environments. The irregular metabolic pathways exhibited by cancer cells result in the production of acidic byproducts that are excreted and accumulate in the extracellular tumor microenvironment, reducing the pH. As a consequence of the lower pH in tumors, cancer cells increase the expression of metastatic phenotypes and chemotherapeutic resistance. A significant limitation in current cancer therapies is the inability to locally deliver chemotherapeutics, leading to significant damage to healthy cells in systemic administration. To overcome these challenges, we present an injectable chitosan-poly(ethylene glycol) hydrogel that is dual-loaded with doxorubicin and sodium bicarbonate providing alkaline buffering of extracellular acidity and simultaneous chemotherapeutic delivery to increase chemotherapeutic efficacy. We conducted in vitro studies of weak base chemotherapeutic and alkaline buffer release from the hydrogel. The release of doxorubicin from hydrogels increased in a low-pH environment and was dependent on the encapsulated sodium bicarbonate concentration. We investigated the influence of pH on the doxorubicin efficacy and viability of MCF-7 and MDA-MB-231 breast cancer cell lines. The results show a 2- to 3-fold increase in IC50 values from neutral pH to low pH, showing decreased cancer cell viability at neutral pH as compared to acidic pH. The IC50 results were shown to correlate with a decrease in intracellular uptake of doxorubicin at low pH. The proposed hydrogels were confirmed to be nontoxic to healthy MCF-10A mammary epithelial cells. Rheological studies were performed to verify that the dual-loaded hydrogels were injectable. The mechanical and release properties of the hydrogels were maintained after extended storage. The chemotherapeutic activity of doxorubicin was evaluated in the presence of the proposed pH-regulating hydrogels. The findings suggest a promising nontoxic, biodegradable hydrogel buffer delivery system that can achieve two simultaneous important goals of local acidosis neutralization and chemotherapeutic release.
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Affiliation(s)
- Zahra Ahmed
- School of Engineering, Brown University, Providence, Rhode Island 02912, United States
- Center for Biomedical Engineering, Brown University, Providence, Rhode Island 02912, United States
| | - Kevin LoGiudice
- School of Engineering, Brown University, Providence, Rhode Island 02912, United States
- Center for Biomedical Engineering, Brown University, Providence, Rhode Island 02912, United States
| | - Gavin Mays
- School of Engineering, Brown University, Providence, Rhode Island 02912, United States
- Center for Biomedical Engineering, Brown University, Providence, Rhode Island 02912, United States
| | - Angelina Schorr
- School of Engineering, Brown University, Providence, Rhode Island 02912, United States
- Center for Biomedical Engineering, Brown University, Providence, Rhode Island 02912, United States
| | - Rachel Rowey
- School of Engineering, Brown University, Providence, Rhode Island 02912, United States
- Center for Biomedical Engineering, Brown University, Providence, Rhode Island 02912, United States
| | - Haisong Yang
- School of Engineering, Brown University, Providence, Rhode Island 02912, United States
- Center for Biomedical Engineering, Brown University, Providence, Rhode Island 02912, United States
| | - Shruti Trivedi
- School of Engineering, Brown University, Providence, Rhode Island 02912, United States
| | - Vikas Srivastava
- School of Engineering, Brown University, Providence, Rhode Island 02912, United States
- Center for Biomedical Engineering, Brown University, Providence, Rhode Island 02912, United States
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3
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Lee C. Targeted hyperalkalization with NaOH-loaded starch implants enhances doxorubicin efficacy in tumor treatment. Asian J Pharm Sci 2023; 18:100853. [PMID: 37908235 PMCID: PMC10613916 DOI: 10.1016/j.ajps.2023.100853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 08/31/2023] [Accepted: 09/06/2023] [Indexed: 11/02/2023] Open
Abstract
High-alkali treatment using sodium hydroxide (NaOH) injection can be a therapeutic approach for killing tumor cells. Alkalization can damage cellular structures and lead to cell death. Increased alkalinity can also enhance the efficacy of certain chemotherapeutic drugs such as doxorubicin (DOX). In this study, NaOH-loaded starch implants (NST implants) were used to induce hyperalkalization (increase pH) in the tumor environment, thereby inducing necrosis and enhancing the effects of DOX. NaOH is a strongly alkaline substance that can increase the pH when injected into a tumor. However, the administration of NaOH can have toxic side effects because it increases the pH of the entire body, not just at the tumor site. To overcome this problem, we developed an injectable NST implant, in which NaOH can be delivered directly into the tumor. This study showed that NST implants could be easily administered intratumorally in mice bearing 4T1 tumors and that most of the NaOH released from the NST implants was delivered to the tumors. Although some NaOH from NST implants can be systemically absorbed, it is neutralized by the body's buffering effect, thereby reducing the risk of toxicity. This study also confirmed both in vitro and in vivo that DOX is more effective at killing 4T1 cells when alkalized. It has been shown that administration of DOX after injection of an NST implant can kill most tumors. Systemic absorption and side effects can be reduced using an NST implant to deliver NaOH to the tumor. In addition, alkalinization induced by NST implants not only exerts anticancer effects but can also enhance the effect of DOX in killing cancer cells. Therefore, the combination of NaOH-loaded starch implants and DOX treatment has the potential to be a novel therapy for tumors.
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Affiliation(s)
- Changkyu Lee
- Department of Biopharmaceutical Engineering, Division of Chemistry and Biotechnology, Dongguk University, Gyeongju 38066, Korea
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4
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Tsume Y, Ashworth L, Bermejo M, Cheng J, Cicale V, Dressman J, Fushimi M, Gonzalez-Alvarez I, Guo Y, Jankovsky C, Lu X, Matsui K, Patel S, Sanderson N, Sun CC, Thakral NK, Yamane M, Zöller L. Harmonizing Biopredictive Methodologies Through the Product Quality Research Institute (PQRI) Part I: Biopredictive Dissolution of Ibuprofen and Dipyridamole Tablets. AAPS J 2023; 25:45. [PMID: 37085637 DOI: 10.1208/s12248-023-00793-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Accepted: 02/07/2023] [Indexed: 04/23/2023] Open
Abstract
Assessing in vivo performance to inform formulation selection and development decisions is an important aspect of drug development. Biopredictive dissolution methodologies for oral dosage forms have been developed to understand in vivo performance, assist in formulation development/optimization, and forecast the outcome of bioequivalence studies by combining them with simulation tools to predict plasma profiles in humans. However, unlike compendial dissolution methodologies, the various biopredictive methodologies have not yet been harmonized or standardized. This manuscript presents the initial phases of an effort to develop best practices and move toward standardization of the biopredictive methodologies through the Product Quality Research Institute (PQRI, https://pqri.org ) entitled "The standardization of in vitro predictive dissolution methodologies and in silico bioequivalence study Working Group." This Working Group (WG) is comprised of participants from 10 pharmaceutical companies and academic institutes. The project will be accomplished in a total of five phases including assessing the performance of dissolution protocols designed by the individual WG members, and then building "best practice" protocols based on the initial dissolution profiles. After refining the "best practice" protocols to produce equivalent dissolution profiles, those will be combined with physiologically based biopharmaceutics models (PBBM) to predict plasma profiles. In this manuscript, the first two of the five phases are reported, namely generating biopredictive dissolution profiles for ibuprofen and dipyridamole and using those dissolution profiles with PBBM to match the clinical plasma profiles. Key experimental parameters are identified, and this knowledge will be applied to build the "best practice" protocol in the next phase.
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Affiliation(s)
- Yasuhiro Tsume
- Merck & Co., Inc., 126 E Lincoln Avenue, Rahway, New Jersey, USA.
| | | | | | - Joan Cheng
- University of Minnesota, Minneapolis, Minneapolis, USA
| | - Vincent Cicale
- Bristol-Myers Squibb Company, New Brunswick, New Jersey, USA
| | - Jennifer Dressman
- Fraunhofer Institute for Translational Medicine Pharmacology, Frankfurt, Germany
- Goethe Universität, Frankfurt, Germany
| | | | | | - Yiwang Guo
- University of Minnesota, Minneapolis, Minneapolis, USA
| | - Corinne Jankovsky
- Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut, USA
| | - Xujin Lu
- Bristol-Myers Squibb Company, New Brunswick, New Jersey, USA
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Sakamoto A, Sugano K. Dissolution Profiles of Poorly Soluble Drug Salts in Bicarbonate Buffer. Pharm Res 2023; 40:989-998. [PMID: 37024757 DOI: 10.1007/s11095-023-03508-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Accepted: 03/22/2023] [Indexed: 04/08/2023]
Abstract
PURPOSE The purpose of the present study was to investigate the effect of buffer species on the dissolution profiles of poorly soluble drug salts, focusing on bicarbonate buffer (BCB). METHODS Pioglitazone HCl (PIO HCl) and dantrolene sodium (DNT Na) were used as model drugs. Non-sink dissolution tests were performed using phosphate buffer (PB) and BCB (pH 6.5, buffer capacity: 4.4 mM/pH, ionic strength: 0.14 M, with/ without bile micelles). The pH value of BCB was maintained using a floating lid that avoided the loss of CO2. The particles collected at the early stage of dissolution (< 5 min) were analyzed by powder X-ray diffraction, polarized light microscopy, and scanning electron microscopy. A bulk-phase pH shift precipitation test was also performed. RESULTS The dissolution of PIO HCl was slower in BCB than in PB, whereas that of DNT Na was faster in BCB than in PB. The same trend was observed in the presence of bile micelles. Free-form precipitation on the surface of salt particles was observed early in their dissolution in both BCB and PB. However, the surface textures in BCB and PB were different. The bulk-phase precipitation of PIO was little affected by buffer species, whereas that of DNT was affected, but oppositely to the dissolution profile. CONCLUSION The dissolution profiles of PIO HCl and DNT Na in BCB were markedly different from those in PB. Free-form precipitation on the particle surface, rather than in the bulk phase, was affected by buffer species in the dissolution test.
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Affiliation(s)
- Aoi Sakamoto
- Molecular Pharmaceutics Lab., College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1, Noji-Higashi, Kusatsu, Shiga, 525-8577, Japan
| | - Kiyohiko Sugano
- Molecular Pharmaceutics Lab., College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1, Noji-Higashi, Kusatsu, Shiga, 525-8577, Japan.
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6
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Tsume Y. Evaluation and prediction of oral drug absorption and bioequivalence with food-drug interaction. Drug Metab Pharmacokinet 2023; 50:100502. [PMID: 37001300 DOI: 10.1016/j.dmpk.2023.100502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 02/21/2023] [Accepted: 03/02/2023] [Indexed: 03/08/2023]
Abstract
This article reviews the impacts on the in vivo prediction of oral bioavailability (BA) and bioequivalence (BE) based on Biopharmaceutical classification systems (BCS) by the food-drug interaction (food effect) and the gastrointestinal (GI) environmental change. Various in vitro and in silico predictive methodologies have been used to expect the BA and BE of the test oral formulation. Food intake changes the GI physiology and environment, which affect oral drug absorption and its BE evaluation. Even though the pHs and bile acids in the GI tract would have significant influence on drug dissolution and, hence, oral drug absorption, those impacts largely depend on the physicochemical properties of oral medicine, active pharmaceutical ingredients (APIs). BCS class I and III drugs are high soluble drugs in the physiological pH range, food-drug interaction may not affect their BA. On the other hand, BCS class II and IV drugs have pH-dependent solubility, and the more bile acid secretion and the pH changes by food intake might affect their BA. In this report, the GI physiological changes between the fasted and fed states are described and the prediction on the oral drug absorption by food-drug interaction have been introduced.
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Pepin XJH, Hammarberg M, Mattinson A, Moir A. Physiologically Based Biopharmaceutics Model for Selumetinib Food Effect Investigation and Capsule Dissolution Safe Space - Part I: Adults. Pharm Res 2023; 40:387-403. [PMID: 36002614 DOI: 10.1007/s11095-022-03339-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 07/09/2022] [Indexed: 11/28/2022]
Abstract
OBJECTIVE A physiologically based biopharmaceutics model (PBBM) was developed to mechanistically investigate the effect of formulation and food on selumetinib pharmacokinetics. METHODS Selumetinib is presented as a hydrogen sulfate salt, and in vitro and in vivo data were used to verify the precipitation rate to apply to simulations. Dissolution profiles observed for capsules and granules were used to derive product-particle size distributions for model input. The PBBM incorporated gut efflux and first-pass gut metabolism, based on intravenous and oral pharmacokinetic data, alongside in vitro data for the main enzyme isoform and P-glycoprotein efflux. The PBBM was validated across eight clinical scenarios. RESULTS The quality-control dissolution method for selumetinib capsules was found to be clinically relevant through PBBM validation. A safe space for capsule dissolution was established using a virtual batch. The effect of food (low fat vs high fat) on capsules and granules was elucidated by the PBBM. For capsules, a lower amount was dissolved in the fed state due to a pH increase in the stomach followed by higher precipitation in the small intestine. First-pass gut extraction is higher for capsules in the fed state due to drug dilution in the stomach chyme and reduced concentration in the lumen. The enteric-coated granules dissolve more slowly than capsules after stomach emptying, attenuating the difference in first-pass gut extraction between prandial states. CONCLUSIONS The PBBM was instrumental in understanding and explaining the different behaviors of the selumetinib formulations. The model can be used to predict the impact of food in humans.
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Affiliation(s)
- Xavier J H Pepin
- New Modalities and Parenteral Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Macclesfield, UK
| | - Maria Hammarberg
- Oral Product Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Gothenburg, Sweden. .,AstraZeneca, Pepparedsleden, SE-431 83, Mölndal, Sweden.
| | - Alexandra Mattinson
- Oral Product Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Macclesfield, UK
| | - Andrea Moir
- Oral Product Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Macclesfield, UK
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8
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Matsui K, Nakamichi K, Nakatani M, Yoshida H, Yamashita S, Yokota S. Lowly-buffered biorelevant dissolution testing is not necessarily biopredictive of human bioequivalence study outcome: Relationship between dissolution and pharmacokinetics. Int J Pharm 2023; 631:122531. [PMID: 36563795 DOI: 10.1016/j.ijpharm.2022.122531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 11/28/2022] [Accepted: 12/18/2022] [Indexed: 12/25/2022]
Abstract
It has been revealed that buffer capacity of aspirated human intraluminal fluid is much lower than that of in vitro compendial dissolution media. Since buffer capacity significantly alters the dissolution profile of certain drug products, dissolution testing in highly buffered media dictates poor predictability of in vivo drug performance. To mitigate this inconsistency, low buffer capacity medium was suggested as an in vivo representation (biorelevant dissolution testing). The purpose of this study was to characterize the dissolution profiles of enteric-coated drug products in different buffer capacity media in a flow through cell dissolution apparatus, and to evaluate the in vivo predictability of human bioequivalence study outcomes conducted in the fasted state. It was confirmed that the lower the buffer capacity of dissolution media, the higher the discriminatory power of esomeprazole magnesium hydrate enteric-coated pellets, reflecting human bioequivalence failure. In the meantime, two duloxetine hydrochloride enteric-coated pellets also exhibited distinct dissolution profiles in such a lowly buffered medium despite the fact that these two are bioequivalent in human. Biopharmaceutical and pharmacokinetic characteristics comparison suggested that low intestinal permeability and small systemic elimination rate of duloxetine hinders the clear impact of different dissolution profile on its in vivo performance. These data suggest that dissolution comparison in physiologically-relevant low buffer capacity media is not always indicative of human bioequivalence. Instead, biopharmaceutical and pharmacokinetic aspects must be taken into consideration to make biorelevant dissolution testing biopredictive.
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Affiliation(s)
- Kazuki Matsui
- Research & Development Division, Sawai Pharmaceutical Co., Ltd., Osaka 532-0003, Japan.
| | - Katsuki Nakamichi
- Research & Development Division, Sawai Pharmaceutical Co., Ltd., Osaka 532-0003, Japan
| | - Masatoshi Nakatani
- Research & Development Division, Sawai Pharmaceutical Co., Ltd., Osaka 532-0003, Japan
| | - Hiroyuki Yoshida
- Division of Drugs, National Institute of Health Sciences, Kawasaki 210-9501, Japan
| | - Shinji Yamashita
- Faculty of Pharmaceutical Sciences, Setsunan University, Osaka 573-0101, Japan
| | - Shoji Yokota
- Research & Development Division, Sawai Pharmaceutical Co., Ltd., Osaka 532-0003, Japan
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9
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Martinez MN, Wu F, Sinko B, Brayden DJ, Grass M, Kesisoglou F, Stewart A, Sugano K. A Critical Overview of the Biological Effects of Excipients (Part II): Scientific Considerations and Tools for Oral Product Development. AAPS J 2022; 24:61. [DOI: 10.1208/s12248-022-00713-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Accepted: 04/16/2022] [Indexed: 11/30/2022] Open
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10
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Ex-situ mineral carbonation – A parameter study on carbon mineralisation in an autoclave as part of a large-scale utilisation process. J CO2 UTIL 2022. [DOI: 10.1016/j.jcou.2022.101928] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Awad A, Madla CM, McCoubrey LE, Ferraro F, Gavins FK, Buanz A, Gaisford S, Orlu M, Siepmann F, Siepmann J, Basit AW. Clinical translation of advanced colonic drug delivery technologies. Adv Drug Deliv Rev 2022; 181:114076. [PMID: 34890739 DOI: 10.1016/j.addr.2021.114076] [Citation(s) in RCA: 55] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 10/26/2021] [Accepted: 12/02/2021] [Indexed: 12/12/2022]
Abstract
Targeted drug delivery to the colon offers a myriad of benefits, including treatment of local diseases, direct access to unique therapeutic targets and the potential for increasing systemic drug bioavailability and efficacy. Although a range of traditional colonic delivery technologies are available, these systems exhibit inconsistent drug release due to physiological variability between and within individuals, which may be further exacerbated by underlying disease states. In recent years, significant translational and commercial advances have been made with the introduction of new technologies that incorporate independent multi-stimuli release mechanisms (pH and/or microbiota-dependent release). Harnessing these advanced technologies offers new possibilities for drug delivery via the colon, including the delivery of biopharmaceuticals, vaccines, nutrients, and microbiome therapeutics for the treatment of both local and systemic diseases. This review details the latest advances in colonic drug delivery, with an emphasis on emerging therapeutic opportunities and clinical technology translation.
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12
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García MA, Varum F, Al-Gousous J, Hofmann M, Page S, Langguth P. In Vitro Methodologies for Evaluating Colon-Targeted Pharmaceutical Products and Industry Perspectives for Their Applications. Pharmaceutics 2022; 14:pharmaceutics14020291. [PMID: 35214024 PMCID: PMC8876830 DOI: 10.3390/pharmaceutics14020291] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 01/22/2022] [Accepted: 01/24/2022] [Indexed: 02/04/2023] Open
Abstract
Several locally acting colon-targeted products to treat colonic diseases have been recently developed and marketed, taking advantage of gastrointestinal physiology to target delivery. Main mechanisms involve pH-dependent, time-controlled and/or enzymatic-triggered release. With site of action located before systemic circulation and troublesome colonic sampling, there is room for the introduction of meaningful in vitro methods for development, quality control (QC) and regulatory applications of these formulations. A one-size-fits-all method seems unrealistic, as the selection of experimental conditions should resemble the physiological features exploited to trigger the release. This article reviews the state of the art for bio-predictive dissolution testing of colon-targeted products. Compendial methods overlook physiological aspects, such as buffer molarity and fluid composition. These are critical for pH-dependent products and time-controlled systems containing ionizable drugs. Moreover, meaningful methods for enzymatic-triggered products including either bacteria or enzymes are completely ignored by pharmacopeias. Bio-predictive testing may accelerate the development of successful products, although this may require complex methodologies. However, for high-throughput routine testing (e.g., QC), simplified methods can be used where balance is struck between simplicity, robustness and transferability on one side and bio-predictivity on the other. Ultimately, bio-predictive methods can occupy a special niche in terms of supplementing plasma concentration data for regulatory approval.
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Affiliation(s)
- Mauricio A. García
- Department of Biopharmaceutics and Pharmaceutical Technology, Johannes Gutenberg University Mainz, 55099 Mainz, Germany; (M.A.G.); (J.A.-G.)
| | - Felipe Varum
- Pharmaceutical Research and Development, F. Hoffmann-La Roche Ltd., 4070 Basel, Switzerland; (F.V.); (M.H.); (S.P.)
| | - Jozef Al-Gousous
- Department of Biopharmaceutics and Pharmaceutical Technology, Johannes Gutenberg University Mainz, 55099 Mainz, Germany; (M.A.G.); (J.A.-G.)
- Department of Pharmaceutical Sciences, University of Michigan, 428 Church Street, Ann Arbor, MI 48109, USA
| | - Michael Hofmann
- Pharmaceutical Research and Development, F. Hoffmann-La Roche Ltd., 4070 Basel, Switzerland; (F.V.); (M.H.); (S.P.)
| | - Susanne Page
- Pharmaceutical Research and Development, F. Hoffmann-La Roche Ltd., 4070 Basel, Switzerland; (F.V.); (M.H.); (S.P.)
| | - Peter Langguth
- Department of Biopharmaceutics and Pharmaceutical Technology, Johannes Gutenberg University Mainz, 55099 Mainz, Germany; (M.A.G.); (J.A.-G.)
- Correspondence:
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13
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Understanding the local chemical environment of bioelectrocatalysis. Proc Natl Acad Sci U S A 2022; 119:2114097119. [PMID: 35058361 PMCID: PMC8795565 DOI: 10.1073/pnas.2114097119] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/16/2021] [Indexed: 11/18/2022] Open
Abstract
Bioelectrochemistry employs an array of high-surface-area meso- and macroporous electrode architectures to increase protein loading and the electrochemical current response. While the local chemical environment has been studied in small-molecule and heterogenous electrocatalysis, conditions in enzyme electrochemistry are still commonly established based on bulk solution assays, without appropriate consideration of the nonequilibrium conditions of the confined electrode space. Here, we apply electrochemical and computational techniques to explore the local environment of fuel-producing oxidoreductases within porous electrode architectures. This improved understanding of the local environment enabled simple manipulation of the electrolyte solution by adjusting the bulk pH and buffer pKa to achieve an optimum local pH for maximal activity of the immobilized enzyme. When applied to macroporous inverse opal electrodes, the benefits of higher loading and increased mass transport were employed, and, consequently, the electrolyte adjusted to reach −8.0 mA ⋅ cm−2 for the H2 evolution reaction and −3.6 mA ⋅ cm−2 for the CO2 reduction reaction (CO2RR), demonstrating an 18-fold improvement on previously reported enzymatic CO2RR systems. This research emphasizes the critical importance of understanding the confined enzymatic chemical environment, thus expanding the known capabilities of enzyme bioelectrocatalysis. These considerations and insights can be directly applied to both bio(photo)electrochemical fuel and chemical synthesis, as well as enzymatic fuel cells, to significantly improve the fundamental understanding of the enzyme–electrode interface as well as device performance.
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14
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Hens B, Seegobin N, Bermejo M, Tsume Y, Clear N, McAllister M, Amidon GE, Amidon GL. Dissolution Challenges Associated with the Surface pH of Drug Particles: Integration into Mechanistic Oral Absorption Modeling. AAPS J 2022; 24:17. [PMID: 34982285 DOI: 10.1208/s12248-021-00663-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 10/20/2021] [Indexed: 12/16/2022] Open
Abstract
The present work aimed to differentiate between in vitro dissolution profiles of ibuprofen as input for GastroPlus™ and to see the impact on systemic exposure. In vitro dissolution profiles of ibuprofen obtained under low- and high-buffered dissolution media were used as input using the z-factor approach. In a second step, a customized surface pH calculator was applied to predict the surface pH of ibuprofen under these low- and high-buffered dissolution conditions. These surface pH values were adopted in GastroPlus™ and simulations were performed to predict the systemic outcome. Simulated data were compared with systemic data of ibuprofen obtained under fasted state conditions in healthy subjects. The slower dissolution rate observed when working under low-buffered conditions nicely matched with the slower dissolution rate as observed during the clinical aspiration study and was in line with the systemic exposure of the drug. Finally, a population simulation was performed to explore the impact of z-factor towards bioequivalence (BE) criteria (so-called safe space). Concerning future perspectives, the customized calculator should be developed in such a way to make it possible to predict the dissolution rate (being informed by the particle size distribution) which, in its turn, can be used as a surrogate to predict the USP2 dissolution curve. Subsequently, validation can be done by using this profile as input for PBPK platforms.
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Affiliation(s)
- Bart Hens
- Drug Product Design, Pfizer, Discovery Park, Ramsgate Road, Sandwich, CT13 9ND, UK.
| | - Nidhi Seegobin
- Drug Product Design, Pfizer, Discovery Park, Ramsgate Road, Sandwich, CT13 9ND, UK.,UCL School of Pharmacy, 29-39 Brunswick Square, Bloomsbury, London, WC1N 1AX, UK
| | - Marival Bermejo
- Department of Engineering, Pharmacy Section, Miguel Hernandez University, 03550, San Juan de Alicante, Alicante, Spain
| | - Yasuhiro Tsume
- Merck & Co., Inc, 126 E Lincoln Ave, Rahway, New Jersey, 07065, USA
| | - Nicola Clear
- Drug Product Design, Pfizer, Discovery Park, Ramsgate Road, Sandwich, CT13 9ND, UK
| | - Mark McAllister
- Drug Product Design, Pfizer, Discovery Park, Ramsgate Road, Sandwich, CT13 9ND, UK
| | - Gregory E Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan, 48109-1065, USA
| | - Gordon L Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan, 48109-1065, USA.
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15
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Dissolution Kinetics of Nifedipine-Ionizable Polymer Amorphous Solid Dispersion: Comparison Between Bicarbonate and Phosphate Buffers. Pharm Res 2021; 38:2119-2127. [PMID: 34931285 DOI: 10.1007/s11095-021-03153-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 12/09/2021] [Indexed: 10/19/2022]
Abstract
PURPOSE The intestinal fluid pH is maintained by the bicarbonate buffer system that shows unique properties regarding drug dissolution. Nevertheless, current compendial dissolution tests use phosphate buffers. The purpose of the present study was to investigate the effect of bicarbonate and phosphate buffers on the dissolution profiles of amorphous solid dispersions (ASD) composed of ionizable polymers. METHODS Hydroxypropylmethylcellulose acetate succinate (HPMCAS), amino methacrylate copolymer (AMC), and hydroxypropylmethylcellulose (HPMC) were employed as acidic, basic, and neutral polymers, respectively. Nifedipine (NIF) was used as a model drug. Dissolution profiles were measured in pH 6.5 bicarbonate and phosphate buffers by a mini-scale paddle dissolution test. The pH of bicarbonate buffers was maintained by the floating lid method. RESULTS The pH change of the bicarbonate buffer was suppressed to less than + 0.25 pH for 3 h by the floating lid method. In all cases, the NIF concentration was supersaturated against the solubility of crystalline NIF. The dissolution rates of HPMCAS and AMC ASDs were 1.5 to 2.0-fold slower in the bicarbonate buffer than in the phosphate buffer when compared at the same buffer capacity. The dissolution profile of HPMC ASD was not affected by the buffer species. The higher the buffer capacity and ionic strength, the faster the dissolution rate of HPMCAS ASD. CONCLUSION The dissolution rate of ASDs with ionizable polymers would be overestimated by using unphysiological phosphate buffer solutions. It is important to use a biorelevant bicarbonate buffer solution for dissolution testing.
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16
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Li M, Zhang X, Wu D, Anand O, Chen H, Raines K, Yu L. Understanding In Vivo Dissolution of Immediate Release (IR) Solid Oral Drug Products Containing Weak Acid BCS Class 2 (BCS Class 2a) Drugs. AAPS JOURNAL 2021; 23:113. [PMID: 34704158 DOI: 10.1208/s12248-021-00639-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Accepted: 08/16/2021] [Indexed: 01/27/2023]
Abstract
In vivo drug dissolution kinetics of BCS Class 2a IR solid oral drug products remains largely unknown. An understanding to what extent the solubility influences in vivo dissolution is needed to design appropriate in vitro dissolution methods. In this study, nonsteroidal anti-inflammatory drugs (NSAIDs) are used to investigate the in vivo dissolution of BCS Class 2a drugs based on numerical deconvolution analyses. The PK data were obtained from published literature or drug applications submitted to the FDA. It has been hypothesized that the in vivo drug dissolution rate would likely correlate to the solubility of NSAIDs in the media at gastrointestinal pH. Our findings show a short lag time of absorption (Tlag), comparable to the liquid gastric emptying time and independent of the solubility and formulation. In Vivo drug dissolution of NSAIDs was generally rapid and complete within the regular drug residence time in the small intestine while multi-phase absorption was observed in some subjects for all the NSAIDs. The comparisons of in vivo drug dissolution rate, which was characterized by in vivo dissolution half-life (Thalf), indicate that solubility has a minimal impact on in vivo drug dissolution rate for NSAIDs. Gastric emptying regulated by migrating motor complex (MMC) under fasted state most likely governs drug dissolution and absorption of NSAIDs. For BCS Class 2a IR solid oral drug products, large variability of gastric emptying and MMC as well as the strong driving force of intestinal absorption probably outweigh the impact of solubility on drug in vivo dissolution.
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Affiliation(s)
- Min Li
- Division of Biopharmaceutics, Office of New Drug Products, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, Maryland, USA.
| | - Xinwen Zhang
- Division of Biopharmaceutics, Office of New Drug Products, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, Maryland, USA
| | - Di Wu
- Division of Biopharmaceutics, Office of New Drug Products, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, Maryland, USA.,Biopharmaceutics, Pharmaceutical Sciences, Merck & Co., Inc., Kenilworth, New Jersey, USA
| | - Om Anand
- Division of Biopharmaceutics, Office of New Drug Products, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, Maryland, USA
| | - Hansong Chen
- Division of Biopharmaceutics, Office of New Drug Products, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, Maryland, USA
| | - Kimberly Raines
- Division of Biopharmaceutics, Office of New Drug Products, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, Maryland, USA
| | - Lawrence Yu
- Office of New Drug Products, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, Maryland, 20993, USA
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17
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Is equilibrium slurry pH a good surrogate for solid surface pH during drug dissolution? Eur J Pharm Sci 2021; 168:106037. [PMID: 34637897 DOI: 10.1016/j.ejps.2021.106037] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 09/29/2021] [Accepted: 10/07/2021] [Indexed: 12/27/2022]
Abstract
The purpose of the present study was to investigate the suitability of equilibrium slurry pH (pHeq) as a surrogate of solid surface pH during drug dissolution (pH0). A comprehensive calculation scheme for pHeq and pH0 was formalized based on the principle of charge neutrality (equilibrium charge neutrality for pHeq and charge flux neutrality for pH0). The formalized scheme was then used to investigate the validity of pH0 ≈ pHeq approximation. The approximation of pH0 ≈ pHeq was suggested to be accurate for small molecules (ca. MW = 150) in high concentration buffer media (ca. buffer capacity = 30 mM/ΔpH). In addition, it is valid provided no precipitation of its free form for salts (vice versa for free forms) in both the slurry pH measurement and at the dissolving drug surface. The formalized calculation scheme is simple and applicable to free and salt form drugs in unbuffered and buffered media including bicarbonate buffer. The computational expense is very small so that it is applicable to various computer simulations such as biopharmaceutics modeling and simulation.
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18
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Vannocci T, Quaroni L, de Riso A, Milordini G, Wolna M, Cinque G, Pastore A. Label-Free, Real-Time Measurement of Metabolism of Adherent and Suspended Single Cells by In-Cell Fourier Transform Infrared Microspectroscopy. Int J Mol Sci 2021; 22:ijms221910742. [PMID: 34639083 PMCID: PMC8509135 DOI: 10.3390/ijms221910742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Revised: 09/20/2021] [Accepted: 09/23/2021] [Indexed: 11/16/2022] Open
Abstract
We used infrared (IR) microscopy to monitor in real-time the metabolic turnover of individual mammalian cells in morphologically different states. By relying on the intrinsic absorption of mid-IR light by molecular components, we could discriminate the metabolism of adherent cells as compared to suspended cells. We identified major biochemical differences between the two cellular states, whereby only adherent cells appeared to rely heavily on glycolytic turnover and lactic fermentation. We also report spectroscopic variations that appear as spectral oscillations in the IR domain, observed only when using synchrotron infrared radiation. We propose that this effect could be used as a reporter of the cellular conditions. Our results are instrumental in establishing IR microscopy as a label-free method for real-time metabolic studies of individual cells in different morphological states, and in more complex cellular ensembles.
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Affiliation(s)
- Tommaso Vannocci
- UK Dementia Research Institute at The Wohl Institute of King’s College London, London SE5 9RT, UK; (T.V.); (G.M.)
| | - Luca Quaroni
- Department of Physical Chemistry and Electrochemistry, Faculty of Chemistry, Jagiellonian University, 30-386 Kraków, Poland
- Correspondence: (L.Q.); (A.P.)
| | - Antonio de Riso
- Evotec (UK) Ltd., Dorothy Crowfoot Hodgkin Campus, Milton Park, Abingdon OX14 4RZ, UK;
| | - Giulia Milordini
- UK Dementia Research Institute at The Wohl Institute of King’s College London, London SE5 9RT, UK; (T.V.); (G.M.)
| | - Magda Wolna
- MIRIAM beamline B22, Diamond Light Source, Harwell Campus, Didcot OX11 0DE, UK; (M.W.); (G.C.)
| | - Gianfelice Cinque
- MIRIAM beamline B22, Diamond Light Source, Harwell Campus, Didcot OX11 0DE, UK; (M.W.); (G.C.)
| | - Annalisa Pastore
- UK Dementia Research Institute at The Wohl Institute of King’s College London, London SE5 9RT, UK; (T.V.); (G.M.)
- Correspondence: (L.Q.); (A.P.)
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19
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Krollik K, Lehmann A, Wagner C, Kaidas J, Kubas H, Weitschies W. The effect of buffer species on biorelevant dissolution and precipitation assays - Comparison of phosphate and bicarbonate buffer. Eur J Pharm Biopharm 2021; 171:90-101. [PMID: 34592364 DOI: 10.1016/j.ejpb.2021.09.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 09/07/2021] [Accepted: 09/22/2021] [Indexed: 12/31/2022]
Abstract
Biorelevant solubility and dissolution testing is an important tool during pharmaceutical development, however, solubility experiments performed using biorelevant media often do not properly match the solubility data observed in human intestinal fluids. Even though the bicarbonate buffer is the predominant buffer system in the small intestine, in vitro assays are commonly performed using non-volatile buffer systems like phosphate and maleate. In the current study, bicarbonate- and phosphate-buffered biorelevant media were applied to solubility, dissolution, and precipitation testing for a broad range of model compounds. It was found that the medium affects primarily the dissolution kinetics. However, with the knowledge of the unique buffering properties of bicarbonate buffer in the diffusion layer, it was not always possible to predict the effect of buffer species on solubility and dissolution when changing from phosphate to bicarbonate buffer. This once again highlights the special role of bicarbonate buffer for simulating the conditions in the human intestinal fluids. Moreover, it is necessary to further investigate the factors which may cause the differences in solubility and dissolution behavior when using phosphate- vs. bicarbonate-buffered biorelevant media.
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Affiliation(s)
- Katharina Krollik
- Institute of Pharmacy, Department of Biopharmaceutics and Pharmaceutical Technology, University of Greifswald, Felix-Hausdorff-Straße 3, Greifswald, Germany; Chemical and Pharmaceutical Development, Merck KGaA, Frankfurter Straße 250, Darmstadt, Germany.
| | - Andreas Lehmann
- Chemical and Pharmaceutical Development, Merck KGaA, Frankfurter Straße 250, Darmstadt, Germany.
| | - Christian Wagner
- Chemical and Pharmaceutical Development, Merck KGaA, Frankfurter Straße 250, Darmstadt, Germany.
| | - Jonathan Kaidas
- Chemical and Pharmaceutical Development, Merck KGaA, Frankfurter Straße 250, Darmstadt, Germany.
| | - Holger Kubas
- Chemical and Pharmaceutical Development, Merck KGaA, Frankfurter Straße 250, Darmstadt, Germany.
| | - Werner Weitschies
- Institute of Pharmacy, Department of Biopharmaceutics and Pharmaceutical Technology, University of Greifswald, Felix-Hausdorff-Straße 3, Greifswald, Germany.
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20
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Sakamoto A, Izutsu KI, Yoshida H, Abe Y, Inoue D, Sugano K. Simple bicarbonate buffer system for dissolution testing: Floating lid method and its application to colonic drug delivery system. J Drug Deliv Sci Technol 2021. [DOI: 10.1016/j.jddst.2021.102447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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21
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Mesbahuddin MS, Ganesan A, Kalyaanamoorthy S. Engineering stable carbonic anhydrases for CO2 capture: a critical review. Protein Eng Des Sel 2021; 34:6356912. [PMID: 34427656 DOI: 10.1093/protein/gzab021] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 07/16/2021] [Indexed: 11/14/2022] Open
Abstract
Targeted inhibition of misregulated protein-protein interactions (PPIs) has been a promising area of investigation in drug discovery and development for human diseases. However, many constraints remain, including shallow binding surfaces and dynamic conformation changes upon interaction. A particularly challenging aspect is the undesirable off-target effects caused by inherent structural similarity among the protein families. To tackle this problem, phage display has been used to engineer PPIs for high-specificity binders with improved binding affinity and greatly reduced undesirable interactions with closely related proteins. Although general steps of phage display are standardized, library design is highly variable depending on experimental contexts. Here in this review, we examined recent advances in the structure-based combinatorial library design and the advantages and limitations of different approaches. The strategies described here can be explored for other protein-protein interactions and aid in designing new libraries or improving on previous libraries.
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Affiliation(s)
| | - Aravindhan Ganesan
- School of Pharmacy, University of Waterloo, Waterloo, Ontario N2G 1C5, Canada
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22
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Kitamura Y, Nagaoka M. A Constant-pH Hybrid Monte Carlo Method with a Configuration-Selection Scheme Using the Zero Energy Difference Condition: Elucidation of Molecular Diffusivity Correlated with a pH-Dependent Solvation Shell. J Chem Theory Comput 2021; 17:1030-1044. [PMID: 33475345 DOI: 10.1021/acs.jctc.0c00939] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have proposed a new constant-pH (CpH) hybrid Monte Carlo (MC) method with a configuration-selection (CS) scheme, called the CS-CpH method, to obtain pH-dependent physical properties within a framework of atomistic molecular simulation. The CS-CpH method consists of carrying out a short equilibrium molecular dynamics (MD) and a searching MD coupled with thermostats and barostats to generate physically plausible configurations with changed protonation states (PSs) that are subsequently accepted or rejected according to the Metropolis MC procedure. As an example, we have applied it to glutamic acid in aqueous solution and have demonstrated that it can work to generate reasonably the pH-dependent microscopic configuration ensemble compatible with the experimental pKa value and also to show interestingly the molecular diffusivity correlated with pH-dependent solvation shell. In conclusion, we believe that the present CS-CpH method becomes a quite useful tool to study the microscopic origin of various pH-dependent phenomena, interpreting them in the atomistic chemical processes.
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Affiliation(s)
- Yukichi Kitamura
- Graduate School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Masataka Nagaoka
- Graduate School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan.,Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Honmachi, Kawaguchi 332-0012, Japan.,Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8520, Japan.,Future Value Creation Research Center, Graduate School of Informatics, Nagoya University, Chikusa-ku, Furo-cho, Nagoya, Aichi 464-8601, Japan
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23
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Wilson-McNeal A, Hird C, Hobbs C, Nielson C, Smith KE, Wilson RW, Lewis C. Fluctuating seawater pCO 2/pH induces opposing interactions with copper toxicity for two intertidal invertebrates. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 748:141370. [PMID: 32814294 DOI: 10.1016/j.scitotenv.2020.141370] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 06/26/2020] [Accepted: 07/28/2020] [Indexed: 06/11/2023]
Abstract
Global ocean pCO2 is increasing as a result of anthropogenic CO2 emissions, driving a decline in seawater pH. However, coastal waters already undergo fluctuations in pCO2/pH conditions over far shorter timescales, with values regularly exceeding those predicted for the open ocean by the year 2100. The speciation of copper, and therefore its potential toxicity, is affected by changing seawater pH, yet little is known concerning how present-day natural fluctuations in seawater pH affect copper toxicity to marine biota. Here, we test the hypothesis that a fluctuating seawater pCO2/pH regime will alter the responses of the mussel Mytilus edulis and the ragworm Alitta virens to sub-lethal copper, compared to a static seawater pCO2/pH scenario. Mussels and worms were exposed to 0.1 and 0.25 μM copper respectively, concentrations determined to produce comparable toxicity responses in these species, for two weeks under a fluctuating 12-hour pCO2/pH cycle (pH 8.14-7.53, pCO2 445-1747 μatm) or a static pH 8.14 (pCO2 432 μatm) treatment. Mussels underwent a haemolymph acidosis of 0.1-0.2 pH units in the fluctuating treatments, alongside two-fold increases in the superoxide dismutase activity and DNA damage induced by copper, compared to those induced by copper under static pH conditions. Conversely, ragworms experienced an alkalosis of 0.3 pH units under fluctuating pH/pCO2, driven by a two-fold increase in coelomic fluid bicarbonate. This mitigated the copper-induced oxidative stress to slightly reduce both antioxidant activity and DNA damage, relative to the static pH + copper treatment. These opposing responses suggest that differences in species acid-base physiology were more important in determining toxicity responses than the pH-induced speciation change. With variability in seawater chemistry predicted to increase as climate change progresses, understanding how fluctuating conditions interact with the toxicity of pH-sensitive contaminants will become more crucial in predicting their risk to coastal biota.
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Affiliation(s)
- Alice Wilson-McNeal
- College of Life and Environmental Sciences: Biosciences, Geoffrey Pope Building, University of Exeter, Stocker Road, Exeter EX4 4QD, United Kingdom.
| | - Cameron Hird
- College of Life and Environmental Sciences: Biosciences, Geoffrey Pope Building, University of Exeter, Stocker Road, Exeter EX4 4QD, United Kingdom
| | - Catherine Hobbs
- College of Life and Environmental Sciences: Biosciences, Geoffrey Pope Building, University of Exeter, Stocker Road, Exeter EX4 4QD, United Kingdom
| | - Clara Nielson
- College of Life and Environmental Sciences: Biosciences, Geoffrey Pope Building, University of Exeter, Stocker Road, Exeter EX4 4QD, United Kingdom
| | - Kathryn E Smith
- College of Life and Environmental Sciences: Biosciences, Geoffrey Pope Building, University of Exeter, Stocker Road, Exeter EX4 4QD, United Kingdom; Marine Biological Association, The Laboratory, Citadel Hill, Plymouth PL1 2PB, United Kingdom
| | - Rod W Wilson
- College of Life and Environmental Sciences: Biosciences, Geoffrey Pope Building, University of Exeter, Stocker Road, Exeter EX4 4QD, United Kingdom
| | - Ceri Lewis
- College of Life and Environmental Sciences: Biosciences, Geoffrey Pope Building, University of Exeter, Stocker Road, Exeter EX4 4QD, United Kingdom
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24
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Toward Mechanistic Design of Surrogate Buffers for Dissolution Testing of pH-Dependent Drug Delivery Systems. Pharmaceutics 2020; 12:pharmaceutics12121197. [PMID: 33321933 PMCID: PMC7764239 DOI: 10.3390/pharmaceutics12121197] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 12/03/2020] [Accepted: 12/07/2020] [Indexed: 01/11/2023] Open
Abstract
The in vivo dissolution of enteric-coated (EC) products is often overestimated by compendial in vitro dissolution experiments. It is of great interest to mimic the in vivo conditions as closely as possible in vitro in order to predict the in vivo behavior of EC dosage forms. The reason behind this is the overly high buffering capacity of the common compendial buffers compared to the intestinal bicarbonate buffer. However, a bicarbonate-based buffer is technically difficult to handle due to the need for continuous sparging of the media with CO2 to maintain the desired buffer pH. Therefore, bicarbonate buffers are not commonly used in routine practice and a non-volatile alternative is of interest. A mathematical mass transport modelling approach was previously found to enable accurate calculation of surrogate buffer molarities for small molecule compounds; however, the additional complexity of polymeric materials makes this difficult to achieve for an enteric coat. In this work, an approach was developed allowing relatively rapid screening of potential surrogate buffers for enteric coating. It was found that the effective buffering pKa of bicarbonate at the surface of a dissolving enteric polymer tended to be around 5.5, becoming higher when the dissolving enteric polymer formed a gel of greater firmness/viscosity and vice versa. Using succinate (pKa 5.2 under physiological ionic strength) and/or citrate (pKa 5.7 under physiological ionic strength) at conjugate base molarities corresponding to bicarbonate molarities in the intestinal segments of interest as an initial “guess” can minimize the number of experimental iterations necessary to design an appropriate surrogate.
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25
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Oh JH, Yang JH, Choi H, Kim SK. Bicarbonate Recognition Features of a
Naphthobipyrrole‐strapped
Calix[4]pyrrole. B KOREAN CHEM SOC 2020. [DOI: 10.1002/bkcs.12159] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Ju Hyun Oh
- Department of Chemistry and Research Institute of Natural Science Gyeongsang National University Jinju 52828 Korea
| | - Ju Ho Yang
- Department of Chemistry and Research Institute of Natural Science Gyeongsang National University Jinju 52828 Korea
| | - Han‐Byeol Choi
- Department of Chemistry and Research Institute of Natural Science Gyeongsang National University Jinju 52828 Korea
| | - Sung Kuk Kim
- Department of Chemistry and Research Institute of Natural Science Gyeongsang National University Jinju 52828 Korea
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26
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Augusto FA, Bartoloni FH, Pagano APE, Baader WJ. Mechanistic Study of the Peroxyoxalate System in Completely Aqueous Carbonate Buffer. Photochem Photobiol 2020; 97:309-316. [PMID: 33073353 DOI: 10.1111/php.13343] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 10/07/2020] [Accepted: 10/13/2020] [Indexed: 11/27/2022]
Abstract
The peroxyoxalate reaction is one of the most efficient chemiluminescence transformations, with emission quantum yields of up to 50%; additionally, it is widely utilized in analytical and bioanalytical assays. Although the real reason for its extremely high efficiency is still not yet understood, the mechanism of this transformation has been well elucidated in anhydrous medium. Contrarily, only few mechanistic studies have been performed in aqueous media, which would be of great importance for its application in biological systems. We report here our experimental results of the peroxyoxalate reaction in completely aqueous carbonate buffer, using fluorescein as chemiluminescence activator. The kinetics are very fast in the used basic conditions (pH > 9); despite this, reproducible kinetic results were obtained. The reaction proceeds by specific base catalysis, with rate-limiting attack of hydrogen peroxide anion to the oxalic ester, in competition with ester hydrolysis by hydroxide ion. Emission quantum yields increase with the hydrogen peroxide concentration up to an optimal concentration of 10 mmol L-1 . The infinite singlet quantum yield of (5.8 ± 0.2) × 10-7 is much lower than in anhydrous medium; however, it is similar to quantum yields measured before in partially aqueous media.
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Affiliation(s)
- Felipe A Augusto
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Fernando H Bartoloni
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil.,Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, Brazil
| | - Ana Paula E Pagano
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Wilhelm J Baader
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
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27
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Amaral Silva D, Davies NM, Doschak MR, Al-Gousous J, Bou-Chacra N, Löbenberg R. Mechanistic understanding of underperforming enteric coated products: Opportunities to add clinical relevance to the dissolution test. J Control Release 2020; 325:323-334. [DOI: 10.1016/j.jconrel.2020.06.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 06/26/2020] [Indexed: 02/04/2023]
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28
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Heo NJ, Yang JH, Lynch VM, Ko BJ, Sessler JL, Kim SK. Capture and displacement-based release of the bicarbonate anion by calix[4]pyrroles with small rigid straps. Chem Sci 2020; 11:8288-8294. [PMID: 34094182 PMCID: PMC8163245 DOI: 10.1039/d0sc03445b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Accepted: 07/24/2020] [Indexed: 11/21/2022] Open
Abstract
Two-phenoxy walled calix[4]pyrroles 1 and 2 strapped with small rigid linkers containing pyridine and benzene, respectively, have been synthesized. 1H NMR spectroscopic analyses carried out in CDCl3 revealed that both of receptors 1 and 2 recognize only F- and HCO3 - among various test anions with high preference for HCO3 - (as the tetraethylammonium, TEA+ salt) relative to F- (as the TBA+ salt). The bound HCO3 - anion was completely released out of the receptors upon the addition of F- (as the tetrabutylammonium, TBA+ salt) as a result of significantly enhanced affinities and selectivities of the receptors for F- once converted to the TEAHCO3 complexes. Consequently, relatively stable TEAF complexes of receptors 1 and 2 were formed via anion metathesis occurring within the receptor cavities. By contrast, the direct addition of TEAF to receptors 1 and 2 produces different complexation products initially, although eventually the same TEAF complexes are produced as via sequential TEAHCO3 and TBAF addition. These findings are rationalized in terms of the formation of different ion pair complexes involving interactions both inside and outside of the core receptor framework.
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Affiliation(s)
- Nam Jung Heo
- Department of Chemistry, Research Institute of Natural Science, Gyeongsang National University Jinju 660-701 Korea
| | - Ju Ho Yang
- Department of Chemistry, Research Institute of Natural Science, Gyeongsang National University Jinju 660-701 Korea
| | - Vincent M Lynch
- Department of Chemistry, The University of Texas at Austin 105 E. 24th Street-Stop A5300 Austin Texas 78712-1224 USA
| | - Byoung Joon Ko
- New Drug Development Center, Osong Medical Innovation Foundation Chungbuk Korea 28160
| | - Jonathan L Sessler
- Department of Chemistry, The University of Texas at Austin 105 E. 24th Street-Stop A5300 Austin Texas 78712-1224 USA
| | - Sung Kuk Kim
- Department of Chemistry, Research Institute of Natural Science, Gyeongsang National University Jinju 660-701 Korea
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29
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Biphasic Dissolution as an Exploratory Method During Early Drug Product Development. Pharmaceutics 2020; 12:pharmaceutics12050420. [PMID: 32370237 PMCID: PMC7284338 DOI: 10.3390/pharmaceutics12050420] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 04/28/2020] [Accepted: 04/30/2020] [Indexed: 01/24/2023] Open
Abstract
Dissolution testing is a major tool used to assess a drug product's performance and as a quality control test for solid oral dosage forms. However, compendial equipment and methods may lack discriminatory power and the ability to simulate aspects of in vivo dissolution. Using low buffer capacity media combined with an absorptive phase (biphasic dissolution) increases the physiologic relevance of in vitro testing. The purpose of this study was to use non-compendial and compendial dissolution test conditions to evaluate the in vitro performance of different formulations. The United States Pharmacopeia (USP)-recommended dissolution method greatly lacked discriminatory power, whereas low buffer capacity media discriminated between manufacturing methods. The use of an absorptive phase in the biphasic dissolution test assisted in controlling the medium pH due to the drug removal from the aqueous medium. Hence, the applied non-compendial methods were more discriminative to drug formulation differences and manufacturing methods than conventional dissolution conditions. In this study, it was demonstrated how biphasic dissolution and a low buffer capacity can be used to assess in vitro drug product performance differences. This can be a valuable approach during the early stages of drug product development for investigating in vitro drug release with improved physiological relevance.
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Varum F, Freire AC, Bravo R, Basit AW. OPTICORE™, an innovative and accurate colonic targeting technology. Int J Pharm 2020; 583:119372. [PMID: 32344022 DOI: 10.1016/j.ijpharm.2020.119372] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 04/21/2020] [Accepted: 04/22/2020] [Indexed: 02/08/2023]
Abstract
Inflammatory bowel disease (IBD) is a debilitating condition, estimated to affect 7 million people worldwide. Current IBD treatment strategies are substandard, relying on colonic targeting using the pH gradient along the gastrointestinal tract. Here, we describe an innovative colonic targeting concept, OPTICORE™ coating technology. OPTICORE™ combines two release triggers (pH and enzyme: Phloral™) in the outer layer, with an inner layer promoting a release acceleration mechanism (Duocoat™). The technology comprises an inner layer of partially neutralized enteric polymer with a buffer agent and an outer layer of a mixture of Eudragit® S and resistant starch. 5-aminosalicylic acid (5-ASA) tablets were coated with different inner layers, where the type of polymer, buffer salt concentration and pH of neutralization, were investigated for drug release acceleration. Buffer capacity of polymethacrylate neutralized polymer significantly contributes to the buffer capacity of the inner layer formulation, while buffer salt concentration is a major contributor to dispersion buffer capacity in the case of hypromellose enteric polymer formulations. An interplay between buffer capacity, pH and ionic strength contributes to an accelerated drug release. Resistant starch does not impact the enteric properties but allows for drug release mediated by colonic bacterial enzymes, ensuring complete drug release. Therefore, OPTICORE™ technology is designed to offer significant advantages over standard enteric coatings, particularly allowing for more accurate colonic drug delivery in ulcerative colitis patients.
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Affiliation(s)
- Felipe Varum
- Tillotts Pharma AG, Baslerstrasse 15, CH-4310 Rheinfelden, Switzerland; UCL School of Pharmacy, University College London, Brunswick Square, WC1N 1AX London, UK.
| | - Ana Cristina Freire
- UCL School of Pharmacy, University College London, Brunswick Square, WC1N 1AX London, UK
| | - Roberto Bravo
- Tillotts Pharma AG, Baslerstrasse 15, CH-4310 Rheinfelden, Switzerland
| | - Abdul W Basit
- UCL School of Pharmacy, University College London, Brunswick Square, WC1N 1AX London, UK
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Hofmann M, García MA, Al-Gousous J, Ruiz-Picazo A, Thieringer F, Nguyen MA, Månsson W, Galle PR, Langguth P. In vitro prediction of in vivo absorption of ibuprofen from suspensions through rational choice of dissolution conditions. Eur J Pharm Biopharm 2020; 149:229-237. [DOI: 10.1016/j.ejpb.2020.02.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Revised: 02/07/2020] [Accepted: 02/21/2020] [Indexed: 01/19/2023]
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Bermejo M, Hens B, Dickens J, Mudie D, Paixão P, Tsume Y, Shedden K, Amidon GL. A Mechanistic Physiologically-Based Biopharmaceutics Modeling (PBBM) Approach to Assess the In Vivo Performance of an Orally Administered Drug Product: From IVIVC to IVIVP. Pharmaceutics 2020; 12:pharmaceutics12010074. [PMID: 31963448 PMCID: PMC7023481 DOI: 10.3390/pharmaceutics12010074] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Revised: 01/09/2020] [Accepted: 01/15/2020] [Indexed: 12/25/2022] Open
Abstract
The application of in silico modeling to predict the in vivo outcome of an oral drug product is gaining a lot of interest. Fully relying on these models as a surrogate tool requires continuous optimization and validation. To do so, intraluminal and systemic data are desirable to judge the predicted outcomes. The aim of this study was to predict the systemic concentrations of ibuprofen after oral administration of an 800 mg immediate-release (IR) tablet to healthy subjects in fasted-state conditions. A mechanistic oral absorption model coupled with a two-compartmental pharmacokinetic (PK) model was built in Phoenix WinNonlinWinNonlin® software and in the GastroPlus™ simulator. It should be noted that all simulations were performed in an ideal framework as we were in possession of a plethora of in vivo data (e.g., motility, pH, luminal and systemic concentrations) in order to evaluate and optimize these models. All this work refers to the fact that important, yet crucial, gastrointestinal (GI) variables should be integrated into biopredictive dissolution testing (low buffer capacity media, considering phosphate versus bicarbonate buffer, hydrodynamics) to account for a valuable input for physiologically-based pharmacokinetic (PBPK) platform programs. While simulations can be performed and mechanistic insights can be gained from such simulations from current software, we need to move from correlations to predictions (IVIVC → IVIVP) and, moreover, we need to further determine the dynamics of the GI variables controlling the dosage form transit, disintegration, dissolution, absorption and metabolism along the human GI tract. Establishing the link between biopredictive in vitro dissolution testing and mechanistic oral absorption modeling (i.e., physiologically-based biopharmaceutics modeling (PBBM)) creates an opportunity to potentially request biowaivers in the near future for orally administered drug products, regardless of its classification according to the Biopharmaceutics Classification System (BCS).
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Affiliation(s)
- Marival Bermejo
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, MI 48109-1065, USA; (M.B.); (B.H.); (D.M.); (P.P.); (Y.T.)
- Department of Engineering, Pharmacy Section, Miguel Hernandez University, San Juan de Alicante, 03550 Alicante, Spain
| | - Bart Hens
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, MI 48109-1065, USA; (M.B.); (B.H.); (D.M.); (P.P.); (Y.T.)
- Department of Pharmaceutical & Pharmacological Sciences, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Joseph Dickens
- Department of Statistics, University of Michigan, Ann Arbor, MI 48109, USA; (J.D.); (K.S.)
| | - Deanna Mudie
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, MI 48109-1065, USA; (M.B.); (B.H.); (D.M.); (P.P.); (Y.T.)
- Global Research and Development, Lonza, Bend, OR 97703, USA
| | - Paulo Paixão
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, MI 48109-1065, USA; (M.B.); (B.H.); (D.M.); (P.P.); (Y.T.)
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Avenida Professor Gama Pinto, 1649-003 Lisboa, Portugal
| | - Yasuhiro Tsume
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, MI 48109-1065, USA; (M.B.); (B.H.); (D.M.); (P.P.); (Y.T.)
- Merck & Co., Inc., 126 E Lincoln Ave, Rahway, NJ 07065, USA
| | - Kerby Shedden
- Department of Statistics, University of Michigan, Ann Arbor, MI 48109, USA; (J.D.); (K.S.)
| | - Gordon L. Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, MI 48109-1065, USA; (M.B.); (B.H.); (D.M.); (P.P.); (Y.T.)
- Correspondence: ; Tel.: +1-734-764-2464.; Fax: +1-734-764-6282
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Heo NJ, Oh JH, Lee JT, He Q, Sessler JL, Kim SK. Phenanthroline-strapped calix[4]pyrroles: anion receptors displaying affinity reversal as a function of solvent polarity. Org Chem Front 2020. [DOI: 10.1039/c9qo01377f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Calix[4]pyrroles 1 and 2, diametrically strapped with a phenanthroline via ester and amide linkages, respectively, have been synthesized as anion receptors.
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Affiliation(s)
- Nam Jung Heo
- Department of Chemistry and Research Institute of Natural Science
- Gyeongsang National University
- Jinju 52828
- Korea
| | - Ju Hyun Oh
- Department of Chemistry and Research Institute of Natural Science
- Gyeongsang National University
- Jinju 52828
- Korea
| | - Jeong Tae Lee
- Department of Chemistry and Institute of Applied Chemistry
- Hallym University
- Chuncheon 24252
- Korea
| | - Qing He
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha 410082
- P. R. China
| | | | - Sung Kuk Kim
- Department of Chemistry and Research Institute of Natural Science
- Gyeongsang National University
- Jinju 52828
- Korea
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Oyewusi AJ, Oridupa OA, Saba AB, Oyewusi IK, Mshelbwala MF. Effect of the methanol extract of the red cultivar Allium cepa L. on the serum biochemistry and electrolytes of rats following sub-chronic oral administration. J Basic Clin Physiol Pharmacol 2019; 31:/j/jbcpp.ahead-of-print/jbcpp-2018-0175/jbcpp-2018-0175.xml. [PMID: 31800393 DOI: 10.1515/jbcpp-2018-0175] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 09/06/2019] [Indexed: 11/15/2022]
Abstract
Background In traditional medicine, Allium cepa Linnaeus is used for the treatment of several disease conditions. Whilst reports abound on the effects of several cultivars of A. cepa L on biochemical parameters, similar information on the red cultivar is scarce. This study examines the effects of the methanol extract of the red cultivar A. cepa L on some serum biochemical parameters in experimental Wistar rats. Materials and methods Fifty-five Wistar rats were divided into three groups (A, B and C), which include 25, 25 and 5 rats, respectively. The rats in Groups A and B were sub-divided into 5 groups of 5 rats. Each rat was administered a certain dose of methanol extract of the red cultivar A. cepa L for 14 days (Group A) or 28 days (Group B). Group C rats served as the control and were administered with distilled water (10 mL/kg). Results A. cepa L administration resulted in dyslipidaemia, hyponatremia, hypokalaemia and hyperchloraemia; a significant (p < 0.05) decrease in hepatic enzymes and a significant (p < 0.05) increase in serum bicarbonate, bilirubin and its fractions. Conclusions These biochemical results indicate that the excessive and prolonged medicinal consumption of A. cepa L products beyond 7 days may induce moderate hepatic injury and mild renal dysfunction and may complicate disease conditions, such as hypertension and diabetes. Thus, in order to minimize its toxic effects, it is recommended that A. cepa L products should not be used for more than seven consecutive days or beyond a dosage of 90 mg/kg.
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Affiliation(s)
- Adeoye Joshua Oyewusi
- Department of Veterinary Physiology and Pharmacology, College of Veterinary Medicine, Federal University of Agriculture, Abeokuta, Ogun state, Nigeria, Phone no.:+234 8036676864
| | - Olayinka A Oridupa
- Department of Veterinary Pharmacology and Toxicology, University of Ibadan, Ibadan, Nigeria
| | - Adebowale B Saba
- Department of Veterinary Pharmacology and Toxicology, University of Ibadan, Ibadan, Nigeria
| | - Ibironke K Oyewusi
- Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, Federal University of Agriculture, Abeokuta, Ogun state, Nigeria
| | - Musa F Mshelbwala
- Department of Veterinary Pathology, College of Veterinary Medicine, Federal University of Agriculture, Abeokuta, Ogun state, Nigeria
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Structure and function of the endothelial surface layer: unraveling the nanoarchitecture of biological surfaces. Q Rev Biophys 2019; 52:e13. [PMID: 31771669 DOI: 10.1017/s0033583519000118] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Among the unsolved mysteries of modern biology is the nature of a lining of blood vessels called the 'endothelial surface layer' or ESL. In venous micro-vessels, it is half a micron in thickness. The ESL is 10 times thicker than the endothelial glycocalyx (eGC) at its base, has been presumed to be comprised mainly of water, yet is rigid enough to exclude red blood cells. How is this possible? Developments in physical chemistry suggest that the venous ESL is actually comprised of nanobubbles of CO2, generated from tissue metabolism, in a foam nucleated in the eGC. For arteries, the ESL is dominated by nanobubbles of O2 and N2 from inspired air. The bubbles of the foam are separated and stabilized by thin layers of serum electrolyte and proteins, and a palisade of charged polymer strands of the eGC. The ESL seems to be a respiratory organ contiguous with the flowing blood, an extension of, and a 'lung' in miniature. This interpretation may have far-reaching consequences for physiology.
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Janowska MK, Baughman HER, Woods CN, Klevit RE. Mechanisms of Small Heat Shock Proteins. Cold Spring Harb Perspect Biol 2019; 11:cshperspect.a034025. [PMID: 30833458 DOI: 10.1101/cshperspect.a034025] [Citation(s) in RCA: 70] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Small heat shock proteins (sHSPs) are ATP-independent chaperones that delay formation of harmful protein aggregates. sHSPs' role in protein homeostasis has been appreciated for decades, but their mechanisms of action remain poorly understood. This gap in understanding is largely a consequence of sHSP properties that make them recalcitrant to detailed study. Multiple stress-associated conditions including pH acidosis, oxidation, and unusual availability of metal ions, as well as reversible stress-induced phosphorylation can modulate sHSP chaperone activity. Investigations of sHSPs reveal that sHSPs can engage in transient or long-lived interactions with client proteins depending on solution conditions and sHSP or client identity. Recent advances in the field highlight both the diversity of function within the sHSP family and the exquisite sensitivity of individual sHSPs to cellular and experimental conditions. Here, we will present and highlight current understanding, recent progress, and future challenges.
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Affiliation(s)
- Maria K Janowska
- Department of Biochemistry, University of Washington, Seattle, Washington 98195
| | - Hannah E R Baughman
- Department of Biochemistry, University of Washington, Seattle, Washington 98195
| | - Christopher N Woods
- Department of Biochemistry, University of Washington, Seattle, Washington 98195
| | - Rachel E Klevit
- Department of Biochemistry, University of Washington, Seattle, Washington 98195
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37
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Chatani H, Goto S, Kataoka H, Fujita M, Otsuka Y, Shimada Y, Terada H. Effects of phosphate on drug solubility behavior of mixture ibuprofen and lidocaine. Chem Phys 2019. [DOI: 10.1016/j.chemphys.2019.110415] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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38
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Jede C, Wagner C, Kubas H, Weigandt M, Weber C, Lecomte M, Badolo L, Koziolek M, Weitschies W. Improved Prediction of in Vivo Supersaturation and Precipitation of Poorly Soluble Weakly Basic Drugs Using a Biorelevant Bicarbonate Buffer in a Gastrointestinal Transfer Model. Mol Pharm 2019; 16:3938-3947. [PMID: 31335153 DOI: 10.1021/acs.molpharmaceut.9b00534] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The characterization of intestinal dissolution of poorly soluble drugs represents a key task during the development of both new drug candidates and drug products. The bicarbonate buffer is considered as the most biorelevant buffer for simulating intestinal conditions. However, because of its complex nature, being the volatility of CO2, it has only been rarely used in the past. The aim of this study was to investigate the effect of a biorelevant bicarbonate buffer on intestinal supersaturation and precipitation of poorly soluble drugs using a gastrointestinal (GI) transfer model. Therefore, the results of ketoconazole, pazopanib, and lapatinib transfer model experiments using FaSSIFbicarbonate were compared with the results obtained using standard FaSSIFphosphate. Additionally, the effect of hydroxypropyl methylcellulose acetate succinate (HPMCAS) as a precipitation inhibitor was investigated in both buffer systems and compared to rat pharmacokinetic (PK) studies with and without coadministration of HPMCAS as a precipitation inhibitor. While HPMCAS was found to be an effective precipitation inhibitor for all drugs in FaSSIFphosphate, the effect in FaSSIFbicarbonate was much less pronounced. The PK studies revealed that HPMCAS did not increase the exposure of any of the model compounds significantly, indicating that the transfer model employing bicarbonate-buffered FaSSIF has a better predictive power compared to the model using phosphate-buffered FaSSIF. Hence, the application of a bicarbonate buffer in a transfer model set-up represents a promising approach to increase the predictive power of this in vitrotool and to contribute to the development of drug substances and drug products in a more biorelevant way.
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Affiliation(s)
- Christian Jede
- Institute of Pharmacy, Department of Biopharmaceutics and Pharmaceutical Technology , University of Greifswald , Felix-Hausdorff-Straße 3 , 17489 Greifswald , Germany
| | | | | | | | | | | | | | - Mirko Koziolek
- Institute of Pharmacy, Department of Biopharmaceutics and Pharmaceutical Technology , University of Greifswald , Felix-Hausdorff-Straße 3 , 17489 Greifswald , Germany
| | - Werner Weitschies
- Institute of Pharmacy, Department of Biopharmaceutics and Pharmaceutical Technology , University of Greifswald , Felix-Hausdorff-Straße 3 , 17489 Greifswald , Germany
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Amaral Silva D, Al-Gousous J, Davies NM, Bou Chacra N, Webster GK, Lipka E, Amidon G, Löbenberg R. Simulated, biorelevant, clinically relevant or physiologically relevant dissolution media: The hidden role of bicarbonate buffer. Eur J Pharm Biopharm 2019; 142:8-19. [PMID: 31195131 DOI: 10.1016/j.ejpb.2019.06.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 06/04/2019] [Accepted: 06/08/2019] [Indexed: 01/15/2023]
Abstract
In-vitro dissolution testing of pharmaceutical formulations has been used as a quality control test for many years. At early drug product development, in vivo predictive dissolution testing can be used for guidance in the rational selection of candidate formulations that best fit the desired in vivo dissolution characteristics. At present, the most widely applied dissolution media are phosphate-based buffers and, in some cases, the result of dissolution tests performed in such media have demonstrated reasonable/acceptable IVIVCs. However, the presence of phosphates in human GI luminal fluids is insignificant, which makes the use of such media poorly representative of the in vivo environment. The gastrointestinal lumen has long been shown to be buffered by bicarbonate. Hence, much interest in the development of suitable biorelevant in vitro dissolution media based on bicarbonate buffer systems has evolved. However, there are inherent difficulties associated with these buffers, such as maintaining the pH throughout the dissolution test, as CO2 tends to leave the system. Various mathematical models have been proposed to analyze bicarbonate buffers and they are discussed in this review. Approaches such as using simpler buffer systems instead of bicarbonate have been proposed as surrogate buffers to produce an equivalent buffer effect on drug dissolution on a case-by-case basis. There are many drawbacks related to simpler buffers systems including their poor in vivo predictability. Considerable discrepancies between phosphate and bicarbonate buffer dissolution results have been reported for certain dosage forms, e.g. enteric coated formulations. The role and need of bicarbonate-based buffers in quality control testing requires scientific analysis. This review also encompasses on the use of bicarbonate-based buffers as a potentially in vivo predictive dissolution medium for enteric coated dosage forms.
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Affiliation(s)
- Daniela Amaral Silva
- Faculty of Pharmacy & Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
| | - Jozef Al-Gousous
- College of Pharmacy, University of Michigan, Ann Arbor, MI, United States
| | - Neal M Davies
- Faculty of Pharmacy & Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
| | - Nadia Bou Chacra
- Faculty of Pharmaceutical Sciences, University of Sao Paulo, Sao Paulo, SP, Brazil
| | - Gregory K Webster
- Research and Development, AbbVie Inc., North Chicago, IL, United States
| | | | - Gordon Amidon
- College of Pharmacy, University of Michigan, Ann Arbor, MI, United States
| | - Raimar Löbenberg
- Faculty of Pharmacy & Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada.
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Al-Gousous J, Salehi N, Amidon GE, Ziff RM, Langguth P, Amidon GL. Mass Transport Analysis of Bicarbonate Buffer: Effect of the CO 2-H 2CO 3 Hydration-Dehydration Kinetics in the Fluid Boundary Layer and the Apparent Effective p K a Controlling Dissolution of Acids and Bases. Mol Pharm 2019; 16:2626-2635. [PMID: 31013101 DOI: 10.1021/acs.molpharmaceut.9b00187] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The main buffering system influencing ionizable drug dissolution in the human intestinal fluid is bicarbonate-based; however, it is rarely used in routine pharmaceutical practice due to the volatility of dissolved CO2. The typical pharmaceutical buffers used fail to capture the unique aspects of the hydration-dehydration kinetics of the bicarbonate-CO2 system. In particular, CO2 is involved in a reversible interconversion with carbonic acid (H2CO3), which is the actual conjugate acid of the system, as follows CO2 + H2O ⇌ H2CO3. In contrast to ionization reactions, this interconversion does not equilibrate very rapidly compared to the diffusional processes through a typical fluid diffusion boundary layer at a solid-liquid interface. In this report, a mathematical mass transport analysis was developed for ionizable drug dissolution in bicarbonate using the rules of conservation of mass and electric charge in addition to accounting for the diffusional times and reaction rate constants of the CO2-H2CO3 interconversion. This model, which includes both the hydration reaction rate and dehydration reaction rate, we called the "reversible non-equilibrium" (RNE) model. The predictions made by this RNE approach for ionizable drug dissolution rates were compared to the experimental data generated by an intrinsic dissolution method for three ionizable drugs, indomethacin, ibuprofen, and haloperidol. The results demonstrate the superiority of predictions for the RNE approach compared to the predictions of a model assuming equilibrium between CO2 and H2CO3, as well as models ignoring reactions. The analysis also shows that bicarbonate buffer can be viewed as having an effective p Ka in the boundary layer that is different from that in bulk and is hydrodynamics-dependent.
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Affiliation(s)
- Jozef Al-Gousous
- Department of Pharmaceutical Sciences , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109 , United States
| | - Niloufar Salehi
- Department of Chemical Engineering , University of Michigan , 2300 Hayward Street , Ann Arbor , Michigan 48109 , United States
| | - Gregory E Amidon
- Department of Pharmaceutical Sciences , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109 , United States
| | - Robert M Ziff
- Department of Chemical Engineering , University of Michigan , 2300 Hayward Street , Ann Arbor , Michigan 48109 , United States
| | - Peter Langguth
- Institute of Pharmacy and Biochemistry , Johannes Gutenberg University Mainz , Staudingerweg 5 , 55128 Mainz , Germany
| | - Gordon L Amidon
- Department of Pharmaceutical Sciences , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109 , United States
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41
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Al-Gousous J, Ruan H, Blechar JA, Sun KX, Salehi N, Langguth P, Job NM, Lipka E, Loebenberg R, Bermejo M, Amidon GE, Amidon GL. Mechanistic analysis and experimental verification of bicarbonate-controlled enteric coat dissolution: Potential in vivo implications. Eur J Pharm Biopharm 2019; 139:47-58. [PMID: 30872012 DOI: 10.1016/j.ejpb.2019.03.012] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 01/18/2019] [Accepted: 03/10/2019] [Indexed: 11/27/2022]
Abstract
Enteric coatings have shown in vivo dissolution rates that are poorly predicted by traditional in vitro tests, with the in vivo dissolution being considerably slower than in vitro. To provide a more mechanistic understanding of this, the dependence of the release properties of various enteric-coated (EC) products on bulk pH and bicarbonate molarity was investigated. It was found that, at presumably in vivo-relevant values, the bicarbonate molarity is a more significant determinant of the dissolution profile than the bulk pH. The findings also indicate that this steep relationship between the dissolution of enteric coatings and bicarbonate molarity limits those coatings' performance in vivo. This is attributed to the relatively low bicarbonate molarities in human intestinal fluids. Further, the hydration and dehydrations kinetics of carbonic acid and carbon dioxide are not sufficiently rapid to reach equilibrium in the diffusion layer surrounding a dissolving ionizable solid. This results in the effective pKa of bicarbonate in the diffusion layer being lower than that determined potentiometrically at equilibrium in the bulk surrounding fluid. These results demonstrate the importance of thoroughly investigating the intestinal bicarbonate concentrations and using bicarbonate buffers or properly designed surrogates (if possible) when evaluating enteric drug products during product development and quality control.
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Affiliation(s)
- J Al-Gousous
- College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, MI 48109, USA.
| | - H Ruan
- College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, MI 48109, USA; Department of Chemical Drug, Zhejiang Institute for Food and Drug Control, Hangzhou, Zhejiang 310052, China
| | - J A Blechar
- Institute of Pharmacy and Biochemistry, Johannes Gutenberg Universität Mainz, Staudingerweg 5, 55128 Mainz, Germany
| | - K X Sun
- College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, MI 48109, USA
| | - N Salehi
- Department of Chemical Engineering, University of Michigan, 300 Hayward St, Ann Arbor, MI 48109, USA
| | - P Langguth
- Institute of Pharmacy and Biochemistry, Johannes Gutenberg Universität Mainz, Staudingerweg 5, 55128 Mainz, Germany
| | - N M Job
- College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, MI 48109, USA
| | - E Lipka
- TSRL Inc., 540 Avis Drive, Ann Arbor, MI 48108, USA
| | - R Loebenberg
- Faculty of Pharmacy & Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta T6G 2H7, Canada
| | - M Bermejo
- Department of Engineering, Pharmacy Section, Miguel Hernandez University , San Juan de Alicante, 03550 Alicante, Spain
| | - G E Amidon
- College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, MI 48109, USA
| | - G L Amidon
- College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, MI 48109, USA
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Lionberger RA. Innovation for Generic Drugs: Science and Research Under the Generic Drug User Fee Amendments of 2012. Clin Pharmacol Ther 2019; 105:878-885. [PMID: 30648739 DOI: 10.1002/cpt.1364] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 12/20/2018] [Indexed: 01/06/2023]
Abstract
Regulatory science is science and research intended to improve decision making in a regulatory framework. Improvements in decision making can be in both accuracy (making better decisions) and in efficiency (making faster decisions). Science and research supported by the Generic Drug User Fee Amendments of 2012 (GDUFA) have focused on two innovative methodologies that work together to enable new approaches to development and review of generic drugs: quantitative models and advanced in vitro product characterization. Quantitative models faithfully represent current scientific understanding. They are tools pharmaceutical scientists and clinical pharmacologists use for making better and faster product development decisions. Advances in the in vitro product comparisons provide the measurements of product differences that are the critical input into the models. This paper outlines four areas where science and research funded by GDUFA support synergistic use of models and characterization at critical decision points during generic drug product development and review.
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Affiliation(s)
- Robert A Lionberger
- Office of Research and Standards, Office of Generic Drugs, US Food and Drug Administration Silver Spring, Maryland, USA
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Paixão P, Bermejo M, Hens B, Tsume Y, Dickens J, Shedden K, Salehi N, Koenigsknecht MJ, Baker JR, Hasler WL, Lionberger R, Fan J, Wysocki J, Wen B, Lee A, Frances A, Amidon GE, Yu A, Benninghoff G, Löbenberg R, Talattof A, Sun D, Amidon GL. Linking the Gastrointestinal Behavior of Ibuprofen with the Systemic Exposure between and within Humans-Part 2: Fed State. Mol Pharm 2018; 15:5468-5478. [PMID: 30417648 PMCID: PMC8859981 DOI: 10.1021/acs.molpharmaceut.8b00736] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Exploring the intraluminal behavior of an oral drug product in the human gastrointestinal (GI) tract remains challenging. Many in vivo techniques are available to investigate the impact of GI physiology on oral drug behavior in fasting state conditions. However, little is known about the intraluminal behavior of a drug in postprandial conditions. In a previous report, we described the mean solution and total concentrations of ibuprofen after oral administration of an immediate-release (IR) tablet in fed state conditions. In parallel, blood samples were taken to assess systemic concentrations. The purpose of this work was to statistically evaluate the impact of GI physiology (e.g., pH, contractile events) within and between individuals (intra and intersubject variability) for a total of 17 healthy subjects. In addition, a pharmacokinetic (PK) analysis was performed by noncompartmental analysis, and PK parameters were correlated with underlying physiological factors (pH, time to phase III contractions postdose) and study parameters (e.g., ingested amount of calories, coadministered water). Moreover, individual plasma profiles were deconvoluted to assess the fraction absorbed as a function of time, demonstrating the link between intraluminal and systemic behavior of the drug. The results demonstrated that the in vivo dissolution of ibuprofen depends on the present gastric pH and motility events at the time of administration. Both intraluminal factors were responsible for explaining 63% of plasma Cmax variability among all individuals. For the first time, an in-depth analysis was performed on a large data set derived from an aspiration/motility study, quantifying the impact of physiology on systemic behavior of an orally administered drug product in fed state conditions. The data obtained from this study will help us to develop an in vitro biorelevant dissolution approach and optimize in silico tools in order to predict the in vivo performance of orally administered drug products, especially in fed state conditions.
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Affiliation(s)
- Paulo Paixão
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Avenida Professor Gama Pinto, 1649-003 Lisboa, Portugal
| | - Marival Bermejo
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
- Department of Engineering, Pharmacy Section, Miguel Hernandez University, San Juan de Alicante, 03550 Alicante, Spain
| | - Bart Hens
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
- Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Yasuhiro Tsume
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Joseph Dickens
- Department of Statistics, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Kerby Shedden
- Department of Statistics, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Niloufar Salehi
- Center for the Study of Complex Systems and Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109-2136, United States
| | - Mark J. Koenigsknecht
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Jason R Baker
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, Michigan 48109, United States
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - William L. Hasler
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, Michigan 48109, United States
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Robert Lionberger
- Office of Generic Drugs, Center for Drug Evaluation and Research, US. Food and Drug Administration, Silver Spring, Maryland 20993, United States
| | - Jianghong Fan
- Office of Generic Drugs, Center for Drug Evaluation and Research, US. Food and Drug Administration, Silver Spring, Maryland 20993, United States
| | - Jeffrey Wysocki
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Bo Wen
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Allen Lee
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, Michigan 48109, United States
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Ann Frances
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Gregory E. Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Alex Yu
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Gail Benninghoff
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Raimar Löbenberg
- Faculty of Pharmacy & Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2H7
| | - Arjang Talattof
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Duxin Sun
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Avenida Professor Gama Pinto, 1649-003 Lisboa, Portugal
| | - Gordon L. Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
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Bermejo M, Paixão P, Hens B, Tsume Y, Koenigsknecht MJ, Baker JR, Hasler WL, Lionberger R, Fan J, Dickens J, Shedden K, Wen B, Wysocki J, Löbenberg R, Lee A, Frances A, Amidon GE, Yu A, Salehi N, Talattof A, Benninghoff G, Sun D, Kuminek G, Cavanagh KL, Rodríguez-Hornedo N, Amidon GL. Linking the Gastrointestinal Behavior of Ibuprofen with the Systemic Exposure between and within Humans-Part 1: Fasted State Conditions. Mol Pharm 2018; 15:5454-5467. [PMID: 30372084 DOI: 10.1021/acs.molpharmaceut.8b00515] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The goal of this project was to explore and to statistically evaluate the responsible gastrointestinal (GI) factors that are significant factors in explaining the systemic exposure of ibuprofen, between and within human subjects. In a previous study, we determined the solution and total concentrations of ibuprofen as a function of time in aspirated GI fluids, after oral administration of an 800 mg IR tablet (reference standard) of ibuprofen to 20 healthy volunteers in fasted state conditions. In addition, we determined luminal pH and motility pressure recordings that were simultaneously monitored along the GI tract. Blood samples were taken to determine ibuprofen plasma levels. In this work, an in-depth statistical and pharmacokinetic analysis was performed to explain which underlying GI variables are determining the systemic concentrations of ibuprofen between (inter-) and within (intra-) subjects. In addition, the obtained plasma profiles were deconvoluted to link the fraction absorbed with the fraction dissolved. Multiple linear regressions were performed to explain and quantitatively express the impact of underlying GI physiology on systemic exposure of the drug (in terms of plasma Cmax/AUC and plasma Tmax). The exploratory analysis of the correlation between plasma Cmax/AUC and the time to the first phase III contractions postdose (TMMC-III) explains ∼40% of the variability in plasma Cmax for all fasted state subjects. We have experimentally shown that the in vivo intestinal dissolution of ibuprofen is dependent upon physiological variables like, in this case, pH and postdose phase III contractions. For the first time, this work presents a thorough statistical analysis explaining how the GI behavior of an ionized drug can explain the systemic exposure of the drug based on the individual profiles of participating subjects. This creates a scientifically based and rational framework that emphasizes the importance of including pH and motility in a predictive in vivo dissolution methodology to forecast the in vivo performance of a drug product. Moreover, as no extensive first-pass metabolism is considered for ibuprofen, this study demonstrates how intraluminal drug behavior is reflecting the systemic exposure of a drug.
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Affiliation(s)
- Marival Bermejo
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States.,Department of Engineering, Pharmacy Section , Miguel Hernandez University , San Juan de Alicante, 03550 Alicante , Spain
| | - Paulo Paixão
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy , Universidade de Lisboa , Avenida Professor Gama Pinto , 1649-003 Lisboa , Portugal
| | - Bart Hens
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States.,Department of Pharmaceutical and Pharmacological Sciences , KU Leuven , Herestraat 49 , 3000 Leuven , Belgium
| | - Yasuhiro Tsume
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Mark J Koenigsknecht
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | | | | | - Robert Lionberger
- Office of Generic Drugs, Center for Drug Evaluation and Research , U.S. Food and Drug Administration , Silver Spring , Maryland 20993 , United States
| | - Jianghong Fan
- Office of Generic Drugs, Center for Drug Evaluation and Research , U.S. Food and Drug Administration , Silver Spring , Maryland 20993 , United States
| | | | | | - Bo Wen
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Jeffrey Wysocki
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Raimar Löbenberg
- Faculty of Pharmacy & Pharmaceutical Sciences , University of Alberta , Edmonton , Alberta , Canada T6G 2H7
| | - Allen Lee
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Ann Frances
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Gregory E Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Alex Yu
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Niloufar Salehi
- Center for the Study of Complex Systems and Department of Chemical Engineering , University of Michigan , Ann Arbor , Michigan 48109-2136 , United States
| | - Arjang Talattof
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Gail Benninghoff
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Duxin Sun
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Gislaine Kuminek
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Katie L Cavanagh
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Naír Rodríguez-Hornedo
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Gordon L Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
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Al-Gousous J, Sun KX, McNamara DP, Hens B, Salehi N, Langguth P, Bermejo M, Amidon GE, Amidon GL. Mass Transport Analysis of the Enhanced Buffer Capacity of the Bicarbonate-CO 2 Buffer in a Phase-Heterogenous System: Physiological and Pharmaceutical Significance. Mol Pharm 2018; 15:5291-5301. [PMID: 30362350 DOI: 10.1021/acs.molpharmaceut.8b00783] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The bicarbonate buffer capacity is usually considered in a phase-homogeneous system, at equilibrium, with no CO2 transfer between the liquid buffer phase and another phase. However, typically, an in vitro bicarbonate buffer-based system is a phase-heterogeneous system, as it entails continuously sparging (bubbling) the dissolution medium with CO2 in a gas mixture, at constant ratio, to maintain a constant partial pressure of CO2 (g) and CO2(aq) molarity at a prescribed value, with CO2 diffusing freely between the gas and the aqueous phases. The human gastrointestinal tract is also a phase-heterogeneous system, with CO2 diffusing across the mucosal membrane into the mesenteric arterial blood, which serves as a sink for CO2 from the intestinal lumen. In this report, a mass transport analysis of the apparent buffer capacity of a phase-heterogeneous bicarbonate-CO2 system is developed. It is shown that, most significantly, a phase-heterogeneous bicarbonate-CO2 system can have a much higher buffer capacity than a phase-homogeneous system such that the buffer capacity is dependent on the bicarbonate concentration. It is double that of a phase-homogeneous system at the pH = p Ka for a monoprotic buffer at the same concentration. This buffer capacity enhancement increases hyperbolically with pH above the p Ka, thus providing a much stronger buffering to keep the pH in the physiologically neutral range. The buffer capacity will be dependent on the bicarbonate molarity (which in vivo will depend on the bicarbonate secretion rate) and not the pH of the luminal fluid. Further, there is no conjugate acid accumulation as a result of bicarbonate neutralization, since the resulting carbonic acid (H2CO3) rapidly dehydrates producing CO2 and H2O. The mass transport analysis developed in this report is further supported by in vitro experimental results. This enhanced bicarbonate buffer capacity in a phase-heterogeneous system is of physiological significance as well as significant for the dissolution and absorption of ionizable drugs.
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Affiliation(s)
- Jozef Al-Gousous
- University of Michigan , College of Pharmacy, Department of Pharmaceutical Sciences , 428 Church Street, Room 4002 , Ann Arbor , Michigan 48109 , United States
| | - Kathy X Sun
- University of Michigan , College of Pharmacy, Department of Pharmaceutical Sciences , 428 Church Street, Room 4002 , Ann Arbor , Michigan 48109 , United States
| | - Daniel P McNamara
- Drug Product Science and Technology , Bristol-Myers Squibb , 1 Squibb Drive , New Brunswick , New Jersey 08903 , United States
| | - Bart Hens
- University of Michigan , College of Pharmacy, Department of Pharmaceutical Sciences , 428 Church Street, Room 4002 , Ann Arbor , Michigan 48109 , United States
| | - Niloufar Salehi
- University of Michigan , College of Pharmacy, Department of Pharmaceutical Sciences , 428 Church Street, Room 4002 , Ann Arbor , Michigan 48109 , United States
| | - Peter Langguth
- Johannes Gutenberg Universität Mainz, Fachbereich Chemie Pharmazie und Geowissenschaften , Department of Biopharmaceutics and Pharmaceutical Technology , D-55099 Mainz , Germany
| | - Marival Bermejo
- Universidad Miguel Hernández , Ingenieria: Area Farmacia , Ctra. Alicante-Valencia N 332 , 03550 Sant Joan d'Alacant , Spain
| | - Gregory E Amidon
- University of Michigan , College of Pharmacy, Department of Pharmaceutical Sciences , 428 Church Street, Room 4002 , Ann Arbor , Michigan 48109 , United States
| | - Gordon L Amidon
- University of Michigan , College of Pharmacy, Department of Pharmaceutical Sciences , 428 Church Street, Room 4002 , Ann Arbor , Michigan 48109 , United States
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Tsume Y, Patel S, Fotaki N, Bergstrӧm C, Amidon GL, Brasseur JG, Mudie DM, Sun D, Bermejo M, Gao P, Zhu W, Sperry DC, Vertzoni M, Parrott N, Lionberger R, Kambayashi A, Hermans A, Lu X, Amidon GE. In Vivo Predictive Dissolution and Simulation Workshop Report: Facilitating the Development of Oral Drug Formulation and the Prediction of Oral Bioperformance. AAPS JOURNAL 2018; 20:100. [PMID: 30191341 DOI: 10.1208/s12248-018-0260-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Accepted: 08/23/2018] [Indexed: 12/30/2022]
Affiliation(s)
- Yasuhiro Tsume
- College of Pharmacy, The University of Michigan, 428 Church Street, Ann Arbor, Michigan, 48109, USA. .,Merck & Co., Inc., 126 E Lincoln Ave, Rahway, New Jersey, 07065, USA.
| | - Sanjaykumar Patel
- Merck & Co., Inc., 126 E Lincoln Ave, Rahway, New Jersey, 07065, USA
| | - Nikoletta Fotaki
- Department of Pharmacy and Pharmacology, University of Bath, Bath, UK
| | | | - Gordon L Amidon
- College of Pharmacy, The University of Michigan, 428 Church Street, Ann Arbor, Michigan, 48109, USA
| | - James G Brasseur
- Aerospace Engineering Sciences, University of Colorado, Boulder, Colorado, USA
| | | | - Duxin Sun
- College of Pharmacy, The University of Michigan, 428 Church Street, Ann Arbor, Michigan, 48109, USA
| | | | - Ping Gao
- Abbvie, Inc., Chicago, Illinois, USA
| | - Wei Zhu
- Merck & Co., Inc., West Point, Pennsylvania, 19486, USA
| | - David C Sperry
- Eli Lilly and Company, Indianapolis, Indiana, 46285, USA
| | - Maria Vertzoni
- Department of Pharmacy, National and Kapodistrian University of Athens, Athens, Greece
| | - Neil Parrott
- F. Hoffmann-La Roche, Ltd., Roche Innovation Center, Basel, Switzerland
| | | | | | - Andre Hermans
- Merck & Co., Inc., West Point, Pennsylvania, 19486, USA
| | - Xujin Lu
- Bristol-Myers Squibb Company, New Brunswick, New Jersey, 08903, USA
| | - Gregory E Amidon
- College of Pharmacy, The University of Michigan, 428 Church Street, Ann Arbor, Michigan, 48109, USA
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Hens B, Sinko PD, Job N, Dean M, Al-Gousous J, Salehi N, Ziff RM, Tsume Y, Bermejo M, Paixão P, Brasseur JG, Yu A, Talattof A, Benninghoff G, Langguth P, Lennernäs H, Hasler WL, Marciani L, Dickens J, Shedden K, Sun D, Amidon GE, Amidon GL. Formulation predictive dissolution (fPD) testing to advance oral drug product development: An introduction to the US FDA funded '21st Century BA/BE' project. Int J Pharm 2018; 548:120-127. [PMID: 29944899 PMCID: PMC8845961 DOI: 10.1016/j.ijpharm.2018.06.050] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 05/26/2018] [Accepted: 06/22/2018] [Indexed: 12/13/2022]
Abstract
Over the past decade, formulation predictive dissolution (fPD) testing has gained increasing attention. Another mindset is pushed forward where scientists in our field are more confident to explore the in vivo behavior of an oral drug product by performing predictive in vitro dissolution studies. Similarly, there is an increasing interest in the application of modern computational fluid dynamics (CFD) frameworks and high-performance computing platforms to study the local processes underlying absorption within the gastrointestinal (GI) tract. In that way, CFD and computing platforms both can inform future PBPK-based in silico frameworks and determine the GI-motility-driven hydrodynamic impacts that should be incorporated into in vitro dissolution methods for in vivo relevance. Current compendial dissolution methods are not always reliable to predict the in vivo behavior, especially not for biopharmaceutics classification system (BCS) class 2/4 compounds suffering from a low aqueous solubility. Developing a predictive dissolution test will be more reliable, cost-effective and less time-consuming as long as the predictive power of the test is sufficiently strong. There is a need to develop a biorelevant, predictive dissolution method that can be applied by pharmaceutical drug companies to facilitate marketing access for generic and novel drug products. In 2014, Prof. Gordon L. Amidon and his team initiated a far-ranging research program designed to integrate (1) in vivo studies in humans in order to further improve the understanding of the intraluminal processing of oral dosage forms and dissolved drug along the gastrointestinal (GI) tract, (2) advancement of in vitro methodologies that incorporates higher levels of in vivo relevance and (3) computational experiments to study the local processes underlying dissolution, transport and absorption within the intestines performed with a new unique CFD based framework. Of particular importance is revealing the physiological variables determining the variability in in vivo dissolution and GI absorption from person to person in order to address (potential) in vivo BE failures. This paper provides an introduction to this multidisciplinary project, informs the reader about current achievements and outlines future directions.
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Affiliation(s)
- Bart Hens
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, USA; Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven 3000, Belgium
| | - Patrick D Sinko
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, USA
| | - Nicholas Job
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, USA
| | - Meagan Dean
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, USA
| | - Jozef Al-Gousous
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, USA
| | - Niloufar Salehi
- Center for the Study of Complex Systems and Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109-2136, USA
| | - Robert M Ziff
- Center for the Study of Complex Systems and Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109-2136, USA
| | - Yasuhiro Tsume
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, USA
| | - Marival Bermejo
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, USA; Department Engineering Pharmacy Section, Miguel Hernandez University, San Juan de Alicante, 03550 Alicante, Spain
| | - Paulo Paixão
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, USA; Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisboa, Portugal
| | - James G Brasseur
- Department of Mechanical and Nuclear Engineering, Pennsylvania State University, University Park, PA 16802, USA; Department of Aerospace Engineering Sciences, University of Colorado Boulder, Boulder, CO 80309, USA
| | - Alex Yu
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, USA
| | - Arjang Talattof
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, USA
| | - Gail Benninghoff
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, USA
| | - Peter Langguth
- Department of Pharmaceutical Technology and Biopharmaceutics, Johannes Gutenberg University Mainz, Staudinger Weg 5, Mainz D-55099, Germany
| | - Hans Lennernäs
- Department of Pharmacy, Uppsala University, Uppsala, Sweden
| | - William L Hasler
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Luca Marciani
- Nottingham Digestive Diseases Centre and NIHR Nottingham Biomedical Research Centre at Nottingham University Hospitals NHS Trust and the University of Nottingham, Nottingham NG7 2UH, United Kingdom
| | - Joseph Dickens
- Department of Statistics, University of Michigan, Ann Arbor, MI 48109, USA
| | - Kerby Shedden
- Department of Statistics, University of Michigan, Ann Arbor, MI 48109, USA
| | - Duxin Sun
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, USA
| | - Gregory E Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, USA
| | - Gordon L Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, USA.
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Hens B, Talattof A, Paixão P, Bermejo M, Tsume Y, Löbenberg R, Amidon GL. Measuring the Impact of Gastrointestinal Variables on the Systemic Outcome of Two Suspensions of Posaconazole by a PBPK Model. AAPS JOURNAL 2018; 20:57. [DOI: 10.1208/s12248-018-0217-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Accepted: 03/07/2018] [Indexed: 01/08/2023]
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Harvey I. Robustness and Contingent History: From Prisoner's Dilemma to Gaia Theory. ARTIFICIAL LIFE 2018; 24:29-48. [PMID: 29369714 DOI: 10.1162/artl_a_00252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In both social systems and ecosystems there is a need to resolve potential conflicts between the interests of individuals and the collective interest of the community. The collective interests need to survive the turbulent dynamics of social and ecological interactions. To see how different systems with different sets of interactions have different degrees of robustness, we need to look at their different contingent histories. We analyze abstract artificial life models of such systems, and note that some prominent examples rely on explicitly ahistorical frameworks; we point out where analyses that ignore a contingent historical context can be fatally flawed. The mathematical foundations of Gaia theory are presented in a form whose very basic and general assumptions point to wide applicability across complex dynamical systems. This highlights surprising connections between robustness and accumulated contingent happenstance, regardless of whether Darwinian evolution is or is not implicated. Real-life studies highlight the role of history, and artificial life studies should do likewise.
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Affiliation(s)
- Inman Harvey
- Evolutionary and Adaptive Systems Group, University of Sussex. E-mail:
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