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Huang CH, Hu PY, Wu QY, Xia MY, Zhang WL, Lei ZQ, Li DX, Zhang GS, Feng JF. Preparation, in vitro and in vivo Evaluation of Thermosensitive in situ Gel Loaded with Ibuprofen-Solid Lipid Nanoparticles for Rectal Delivery. Drug Des Devel Ther 2022; 16:1407-1431. [PMID: 35586185 PMCID: PMC9109935 DOI: 10.2147/dddt.s350886] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Accepted: 04/27/2022] [Indexed: 12/13/2022] Open
Abstract
Background Ibuprofen (IBU), a nonsteroidal anti-inflammatory drug, shows poor gastrointestinal absorption due to its low solubility, which limits its clinical application. Objective In the present study, we aimed to develop thermosensitive gel-mediated ibuprofen-solid lipid nanoparticles (IBU-SLN-ISG) to improve the dissolution and bioavailability of IBU after rectal delivery. Methods IBU-loaded SLNs (IBU-SLNs) were developed and optimized applying Box-Behnken design. The optimized IBU-SLNs were characterized by physicochemical parameters and morphology. Then, the optimized IBU-SLNs was incorporated into the gel and characterized for gel properties and rheology and investigated its release in vitro, pharmacokinetics in vivo, rectal irritation and rectal retention time. Results The optimized SLNs had an EE of 90.74 ± 1.40%, DL of 11.36 ± 1.20%, MPS of 166.77 ± 2.26 nm, PDI of 0.27 ± 0.08, and ZP of −21.00 ± 0.59 mV. The FTIR spectra confirmed successful encapsulation of the drug inside the nanoparticle as only peaks responsible for the lipid could be identified. This corroborated well with XRD spectra, which showed a completely amorphous state of the IBU-SLNs as compared to the crystalline nature of the pure drug. The gelation temperature of the prepared IBU-SLN-ISG was 33.30 ± 0.78°C, the gelation time was 14.67 ± 2.52 s, the gel strength was 54.00 ± 1.41 s, and the mucoadhesion was (11.54±0.37) × 102dyne/cm2. The in vitro results of IBU-SLNs and IBU-SLN-ISG showed a biphasic release pattern with initial burst release followed by sustained release. More importantly, IBU-SLN-ISG produced much better absorption of IBU and improved bioavailability in rats. In addition, IBU-SLN-ISG caused no irritation or damage to rectal tissues, and could be retained in the rectum for a long time. Conclusion Thermosensitive in situ gel loaded with IBU-solid lipid nanoparticles might be further developed as a more convenient and effective rectal dosage form.
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Affiliation(s)
- Chun-hui Huang
- School of Pharmacy, Guangxi University of Chinese Medicine, Nanning, Guangxi, 530200, People’s Republic of China
- National Engineering Research Center of Chinese Medicine Solid Preparation Manufacturing Technology, Nanchang, 330006, People’s Republic of China
| | - Peng-yi Hu
- National Engineering Research Center of Chinese Medicine Solid Preparation Manufacturing Technology, Nanchang, 330006, People’s Republic of China
- Jiangxi University of Traditional Chinese Medicine, Nanchang, 330004, People’s Republic of China
| | - Qiu-yan Wu
- National Engineering Research Center of Chinese Medicine Solid Preparation Manufacturing Technology, Nanchang, 330006, People’s Republic of China
- Jiangxi University of Traditional Chinese Medicine, Nanchang, 330004, People’s Republic of China
| | - Ming-yan Xia
- National Engineering Research Center of Chinese Medicine Solid Preparation Manufacturing Technology, Nanchang, 330006, People’s Republic of China
- Jiangxi University of Traditional Chinese Medicine, Nanchang, 330004, People’s Republic of China
| | - Wen-liu Zhang
- Jiangxi University of Traditional Chinese Medicine, Nanchang, 330004, People’s Republic of China
| | - Zhi-qiang Lei
- Jiangxi University of Traditional Chinese Medicine, Nanchang, 330004, People’s Republic of China
| | - Dong-xun Li
- Jiangxi University of Traditional Chinese Medicine, Nanchang, 330004, People’s Republic of China
| | - Guo-song Zhang
- National Engineering Research Center of Chinese Medicine Solid Preparation Manufacturing Technology, Nanchang, 330006, People’s Republic of China
- Jiangxi University of Traditional Chinese Medicine, Nanchang, 330004, People’s Republic of China
- Correspondence: Guo-song Zhang, National Engineering Research Center of Chinese Medicine Solid Preparation Manufacturing Technology, Nanchang, 330006, People’s Republic of China, Email
| | - Jian-fang Feng
- School of Pharmacy, Guangxi University of Chinese Medicine, Nanning, Guangxi, 530200, People’s Republic of China
- National Engineering Research Center of Chinese Medicine Solid Preparation Manufacturing Technology, Nanchang, 330006, People’s Republic of China
- Jian-fang Feng, School of Pharmacy, Guangxi University of Chinese Medicine, Nanning, 530200, People’s Republic of China, Email
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Doostmohammadi M, Ameri A, Mohammadinejad R, Dehghannoudeh N, Banat IM, Ohadi M, Dehghannoudeh G. Hydrogels For Peptide Hormones Delivery: Therapeutic And Tissue Engineering Applications. Drug Des Devel Ther 2019; 13:3405-3418. [PMID: 31579238 PMCID: PMC6770672 DOI: 10.2147/dddt.s217211] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2019] [Accepted: 09/02/2019] [Indexed: 12/13/2022] Open
Abstract
Peptides are the most abundant biological compounds in the cells that act as enzymes, hormones, structural element, and antibodies. Mostly, peptides have problems to move across the cells because of their size and poor cellular penetration. Therefore, a carrier that could transfer peptides into cells is ideal and would be effective for disease treatment. Until now, plenty of polymers, e.g., polysaccharides, polypeptides, and lipids were used in drug delivery. Hydrogels made from polysaccharides showed significant development in targeted delivery of peptide hormones because of their natural characteristics such as networks, pore sizes, sustainability, and response to external stimuli. The main aim of the present review was therefore, to gather the important usages of the hydrogels as a carrier in peptide hormone delivery and their application in tissue engineering and regenerative medicine.
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Affiliation(s)
- Mohsen Doostmohammadi
- Pharmaceutics Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
| | - Atefeh Ameri
- Pharmaceutics Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
| | - Reza Mohammadinejad
- Pharmaceutics Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
| | - Negar Dehghannoudeh
- Faculty of Arts and Science, University of Toronto, TorontoM5S3G3, Ontario, Canada
| | - Ibrahim M Banat
- School of Biomedical Sciences, Faculty of Life & Health Sciences, University of Ulster, ColeraineBT52 1SA, Northern Ireland, UK
| | - Mandana Ohadi
- Pharmaceutics Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
| | - Gholamreza Dehghannoudeh
- Pharmaceutics Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
- Department of Pharmaceutics, Faculty of Pharmacy, Kerman University of Medical Sciences, Kerman, Iran
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Xue J, Shi Y, Li C, Xu X, Xu S, Cao M. Methylcellulose and polyacrylate binary hydrogels used as rectal suppository to prevent type I diabetes. Colloids Surf B Biointerfaces 2018; 172:37-42. [PMID: 30130635 DOI: 10.1016/j.colsurfb.2018.08.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 07/16/2018] [Accepted: 08/13/2018] [Indexed: 10/28/2022]
Abstract
The purpose of this study was to fabricate a novel binary hydrogel, and the insulin-loaded hydrogel was used as rectal suppository to prevent type I diabetes. The binary hydrogel was synthesized via solution polymerization. Its structure was studied by Fourier transform infrared spectroscopy (FTIR) and Raman spectra. The swelling behaviors of binary hydrogels were revealed in pH 1.2, 6.8 and 7.4 buffers, respectively. Their inner morphologies were observed with a scanning electron microscope (SEM). Insulin (INS) was selected as a model drug and encapsulated into the binary hydrogels. INS release study was carried out in pH 7.4 buffer. The hypoglycemic effects of INS-loaded hydrogels were studied by rectal administration. FTIR and Raman spectra confirmed the obtaining of binary hydrogels. The hydrogel showed a high swelling ratio in pH 7.4 (rectum environment). SEM photographs illustrated that many micro-pores in the inner of binary hydrogels, which could accommodate abundant guest molecule (e.g. INS). INS release profile suggested that INS-loaded hydrogels could diffuse INS at a sustained manner. Animal studies proved that INS-loaded binary hydrogel had an obvious hypoglycemic effect. Therefore, it could be speculated that the binary hydrogel had a potential application on treating type I diabetes by rectal administration.
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Affiliation(s)
- Jintao Xue
- College of Pharmacy, Xinxiang Medical University, 453003, Xinxiang, PR China
| | - Yongli Shi
- College of Pharmacy, Xinxiang Medical University, 453003, Xinxiang, PR China.
| | - Chunyan Li
- College of Sanquan, Xinxiang Medical University, 453003, Xinxiang, PR China
| | - Xiaojie Xu
- College of Pharmacy, Xinxiang Medical University, 453003, Xinxiang, PR China
| | - Shuxin Xu
- Tianjin Engineering and Technology Research Institute, Suzhou Institute of Biomedical Engineering and Technology, Tianjin, 300300, PR China
| | - Mingxiang Cao
- College of Pharmacy, Xinxiang Medical University, 453003, Xinxiang, PR China
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Maher S, Mrsny RJ, Brayden DJ. Intestinal permeation enhancers for oral peptide delivery. Adv Drug Deliv Rev 2016; 106:277-319. [PMID: 27320643 DOI: 10.1016/j.addr.2016.06.005] [Citation(s) in RCA: 218] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Revised: 06/07/2016] [Accepted: 06/09/2016] [Indexed: 12/15/2022]
Abstract
Intestinal permeation enhancers (PEs) are one of the most widely tested strategies to improve oral delivery of therapeutic peptides. This article assesses the intestinal permeation enhancement action of over 250 PEs that have been tested in intestinal delivery models. In depth analysis of pre-clinical data is presented for PEs as components of proprietary delivery systems that have progressed to clinical trials. Given the importance of co-presentation of sufficiently high concentrations of PE and peptide at the small intestinal epithelium, there is an emphasis on studies where PEs have been formulated with poorly permeable molecules in solid dosage forms and lipoidal dispersions.
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Sharma G, Sharma AR, Nam JS, Doss GPC, Lee SS, Chakraborty C. Nanoparticle based insulin delivery system: the next generation efficient therapy for Type 1 diabetes. J Nanobiotechnology 2015; 13:74. [PMID: 26498972 PMCID: PMC4619439 DOI: 10.1186/s12951-015-0136-y] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Accepted: 10/15/2015] [Indexed: 12/31/2022] Open
Abstract
Diabetic cases have increased rapidly in recent years throughout the world. Currently, for type-1 diabetes mellitus (T1DM), multiple daily insulin (MDI) injections is the most popular treatment throughout the world. At this juncture, researchers are trying to develop different insulin delivery systems, especially through oral and pulmonary route using nanocarrier based delivery system. This next generation efficient therapy for T1DM may help to improve the quality of life of diabetic patients who routinely employ insulin by the subcutaneous route. In this paper, we have depicted various next generation nanocarrier based insulin delivery systems such as chitosan-insulin nanoparticles, PLGA-insulin nanoparticles, dextran-insulin nanoparticles, polyalkylcyanoacrylated-insulin nanoparticles and solid lipid-insulin nanoparticles. Modulation of these insulin nanocarriers may lead to successful oral or pulmonary insulin nanoformulations in future clinical settings. Therefore, applications and limitations of these nanoparticles in delivering insulin to the targeted site have been thoroughly discussed.
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Affiliation(s)
- Garima Sharma
- Institute For Skeletal Aging, Hallym University-Chuncheon Sacred Heart Hospital, Chuncheon, 200704, Korea. .,Amity Institute of Nanotechnology, Amity University, Noida, Uttar Pradesh, India.
| | - Ashish Ranjan Sharma
- Institute For Skeletal Aging, Hallym University-Chuncheon Sacred Heart Hospital, Chuncheon, 200704, Korea.
| | - Ju-Suk Nam
- Institute For Skeletal Aging, Hallym University-Chuncheon Sacred Heart Hospital, Chuncheon, 200704, Korea.
| | - George Priya C Doss
- Medical Biotechnology Division, School of Biosciences and Technology, VIT University, Vellore, 632014, Tamil Nadu, India.
| | - Sang-Soo Lee
- Institute For Skeletal Aging, Hallym University-Chuncheon Sacred Heart Hospital, Chuncheon, 200704, Korea.
| | - Chiranjib Chakraborty
- Institute For Skeletal Aging, Hallym University-Chuncheon Sacred Heart Hospital, Chuncheon, 200704, Korea. .,Department of Bio-informatics, School of Computer and Information Sciences, Galgotias University, Greater Noida, India.
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Nishimura A, Hayakawa T, Yamamoto Y, Hamori M, Tabata K, Seto K, Shibata N. Controlled release of insulin from self-assembling nanofiber hydrogel, PuraMatrix™: application for the subcutaneous injection in rats. Eur J Pharm Sci 2011; 45:1-7. [PMID: 22064453 DOI: 10.1016/j.ejps.2011.10.013] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2011] [Revised: 08/23/2011] [Accepted: 10/20/2011] [Indexed: 11/28/2022]
Abstract
The concept of this research is, using the acetyl-(Arg-Ala-Asp-Ala)₄-CONH₂ peptide hydrosol (PuraMatrix™, PM), to develop an new injectable formula of controlled insulin delivery for subcutaneous injection. PM has sol-gel phase transition behavior, and was developed as a scaffold in the field of tissue engineering. The aqueous media of the PM including insulin changed from a sol to a gel phase with increasing ion strength of phosphate ion and pH in working environments in vitro and in vivo. In this study, we examined the in vitro insulin dissolution behavior and the in vivo pharmacokinetics and pharmacodynamics after subcutaneous administration of PM-insulin sol (PM-Isol). In the in vitro release study, after PM-Isol was converted to a gel phase (PM-Igel), PM concentration-dependent and controlled release of insulin were observed at the final concentrations of PM between 0.1% and 2.0% (w/v). The PM-Isol is changed to gel form in vivo, and exhibited a sustained-release pharmacokinetics of insulin, where PM concentration-dependent prolongation of efficacy was found. The plasma glucose level markedly decreased, and the lowest plasma glucose level was maintained up to 24h when 2.0% (w/v) PM-Isol was administered subcutaneously to rats. The PM-Isol, we developed here, is applicable for the wild-type of insulin, and increased the bioavailability and hypoglycemic efficacy of insulin after subcutaneous injection. Hence, the PM is a useful inactive ingredient to produce various types of control-released system of insulin by making just a few changes in PM content of the formulation.
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Affiliation(s)
- Asako Nishimura
- Department of Biopharmaceutics, Doshisha Women's College of Liberal Arts, Kyotanabe, Kyoto 610-0395, Japan
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Mady MM, Elshemey WM. Interaction of dipalmitoyl phosphatidylcholine (DPPC) liposomes and insulin. Mol Phys 2011. [DOI: 10.1080/00268976.2011.575408] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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El-Leithy ES, Shaker DS, Ghorab MK, Abdel-Rashid RS. Evaluation of mucoadhesive hydrogels loaded with diclofenac sodium-chitosan microspheres for rectal administration. AAPS PharmSciTech 2010; 11:1695-702. [PMID: 21108027 DOI: 10.1208/s12249-010-9544-3] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2010] [Accepted: 11/09/2010] [Indexed: 11/30/2022] Open
Abstract
Considering the advantageous for the rectal administration of non-steroidal anti-inflammatory drugs, the objective of this study was to formulate and evaluate rectal mucoadhesive hydrogels loaded with diclofenac-sodium chitosan (DFS-CS) microspheres. Hydroxypropyl methylcellulose (HPMC; 5%, 6%, and 7% w/w) and Carbopol 934 (1% w/w) hydrogels containing DFS-CS microspheres equivalent to 1% w/w active drug were prepared. The physicochemical characterization revealed that all hydrogels had a suitable pH for rectal application (6.5-7.4). The consistency of HPMC hydrogels showed direct proportionality to the concentration of the gelling agent, while carbopol 934 gel showed its difficulty for rectal administration. Farrow's constant for all hydrogels were greater than one indicating pseudoplastic flow. In vitro drug release from the mucoadhesive hydrogel formulations showed a controlled drug release pattern, reaching 34.6-39.7% after 6 h. The kinetic analysis of the release data revealed that zero-order was the prominent release mechanism. The mucoadhesion time of 7% w/w HPMC hydrogel was 330 min, allowing the loaded microspheres to be attached to the surface of rectal mucosa. Histopathological examination demonstrated the lowest irritant response to the hydrogel loaded with DFS-CS microspheres in response to other forms of the drug.
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Chalasani KB, Russell-Jones GJ, Jain AK, Diwan PV, Jain SK. Effective oral delivery of insulin in animal models using vitamin B12-coated dextran nanoparticles. J Control Release 2007; 122:141-50. [PMID: 17707540 DOI: 10.1016/j.jconrel.2007.05.019] [Citation(s) in RCA: 172] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2006] [Revised: 05/10/2007] [Accepted: 05/17/2007] [Indexed: 02/02/2023]
Abstract
The potential utility of vitamin B12 carrier system for the oral delivery of conjugated peptides/proteins and enhancement of nanoparticles (NPs) transport has been demonstrated. The present study aims to optimize the effectiveness of VB12-NPs conjugates using different levels of cross-linking, linked with different VB(12)-coatings and evaluates in animal models to investigate an efficient insulin carrier. Amino alkyl VB12 derivatives suitable for oral delivery were synthesized at 5'hydoxy ribose and e-propionamide sites via carbamate and ester/amide linkages, and were coupled to succinic acid modified dextran NPs of varied cross-linking. VB12 binding was confirmed by XPS analysis, and was quantified by HPLC (4.0 to 5.7% w/w of NPs). These polydisperse NPs conjugates showed higher size, high insulin entrapment and faster insulin release with low levels of cross-linking. These VB12-NPs conjugates (150-300 nm) showed profound (70-75% blood glucose reductions) and prolonged (54 h) anti-diabetic effects with biphasic behaviour in STZ diabetic rats. NPs with the low levels of cross-linking were found to be superior carriers, and were more effective with VB12 derivatives of carbamate linkage. The pharmacological availability relative to SC insulin was found to be 29.4%, which was superior compared to NPs conjugate of ester linked VB12 (1.5 fold) and relatively higher cross-linked particles (1.1 fold). Further, the NPs carrier demonstrated a similar oral insulin efficacy in congenital diabetic mice (60% reduction at 20 h). Significant quantities of plasma insulin were found in both animal models (231 and 197 muIU/ml). At two investigated doses, the carrier system shows dose response. Pre-dosing with a large excess of free VB12 minimized the observed activity, indicating predominance of VB12 mediated uptake. It is concluded that VB12-dextran NPs conjugate is a viable carrier for peroral insulin delivery to treat diabetics.
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Affiliation(s)
- Kishore B Chalasani
- Pharmacology Division, Indian Institute of Chemical Technology, Tarnaka, Hyderabad AP, India
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Chalasani KB, Russell-Jones GJ, Yandrapu SK, Diwan PV, Jain SK. A novel vitamin B12-nanosphere conjugate carrier system for peroral delivery of insulin. J Control Release 2006; 117:421-9. [PMID: 17239471 DOI: 10.1016/j.jconrel.2006.12.003] [Citation(s) in RCA: 139] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2006] [Revised: 11/29/2006] [Accepted: 12/04/2006] [Indexed: 11/17/2022]
Abstract
In spite of great potential, effective oral delivery of many vitamin B(12)-peptide/protein drug conjugates does not occur due to the limited uptake capacity of the VB(12) transport system, loss of bioactivity of native protein and/or intrinsic factor affinity of VB(12) and liability to GI degradation. In order to overcome these shortcomings in a two pronged way, we have endeavoured to develop a VB(12)-Nanoparticles (NPs) system to enhance the uptake capacity of both NPs and VB(12) transport to deliver orally effective insulin. NPs were prepared using different molecular weight dextrans and epichlorohydrin as cross-linker by an emulsion method. NPs surface was modified with succinic anhydride, and conjugated with amino VB(12) derivatives of carbamate linkage. VB(12) attachment was confirmed by IR, XPS analysis, and was quantified by HPLC (4.0 to 4.4% w/w of NPs). The pre-formed NPs conjugates (Zave=160-250 nm; polydisperse) were loaded with 2, 3 and 4% w/w of insulin, and the entrapment was found to be 45-70%. NPs conjugates were found to protect 65-83% of entrapped insulin against in vitro gut proteases. In vitro release studies exhibit an initial burst followed by diffusion controlled first order kinetics with 75-95% release within 48 h. After oral administration of these carriers (20 IU/kg), a nadir of 70-75% reduction in plasma glucose was found in 5 h, reached basal levels in 8-10 h, and a prolonged second phase was found until 54 h. The % pharmacological availability (PA) of 70 K NPs conjugate containing 2, 3 and 4% w/w insulin was 1.1, 1.9 and 2.6 fold higher, respectively compared to NPs without VB(12); consistent with the hypothesis that uptake was mediated by the vitamin B(12) transport. NPs of 70 K dextran showed 1.4 fold PA compared to 10 K while negligible action was observed with 200 K. The potential utilities of VB(12)-NPs carrier as an oral delivery platform of proteins, especially insulin via dextran-coated particles necessities further elaborate investigations.
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Affiliation(s)
- Kishore B Chalasani
- Pharmacology Division, Indian Institute of Chemical Technology, Tarnaka, Hyderabad - 500 007. A.P., India
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Bajpai S, Sharma S. Investigation of swelling/degradation behaviour of alginate beads crosslinked with Ca2+ and Ba2+ ions. REACT FUNCT POLYM 2004. [DOI: 10.1016/j.reactfunctpolym.2004.01.002] [Citation(s) in RCA: 471] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Morishita M, Goto T, Peppas NA, Joseph JI, Torjman MC, Munsick C, Nakamura K, Yamagata T, Takayama K, Lowman AM. Mucosal insulin delivery systems based on complexation polymer hydrogels: effect of particle size on insulin enteral absorption. J Control Release 2004; 97:115-24. [PMID: 15147809 DOI: 10.1016/j.jconrel.2004.03.008] [Citation(s) in RCA: 113] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2003] [Accepted: 03/01/2004] [Indexed: 11/17/2022]
Abstract
Insulin-loaded polymer (ILP) microparticles composed of poly(methacrylic acid) and poly(ethylene glycol), which have pH-dependent complexation and mucoadhesive properties have been thought to be potential carriers for insulin via an oral route. Nevertheless, further optimization of the polymer delivery system is required to improve clinical application. Therefore, the effect of particle size of the ILP (L-ILP: 180-230 microm, S-ILP: 43-89 microm, SS-ILP: <43 microm) on insulin absorption was studied in the in situ loop system, hypothesizing smaller particle sizes of ILP could induce bigger hypoglycemic effects due to increase mucoadhesive capacity. To verify the hypothesis, the adhesive capacities of differently sized ILPs to the mucosal tissues were evaluated. Additionally, the intestinal site-specificity of ILP for insulin absorption was investigated. Intra- and inter-cellular integrity and/or damage were also examined by lactate dehydrogenase leakage and membrane electrical resistance change to ensure the safety of ILP as a carrier for oral route. As hypothesized, the smaller sized microparticles (SS-ILP) showed a rapid burst-type insulin release and higher insulin absorption compared with the microparticles having larger sizes, resulting in greater hypoglycemic effects without detectable mucosal damage. In fact, SS-ILP demonstrated higher mucoadhesive capacity to the jejunum and the ileum than those of L-ILP. Moreover, SS-ILP's enhancement effect of insulin mucosal absorption showed a site-specificity, demonstrating maximum effect at the ileal segment. These results imply that the particle size and delivery site are very important factors for ILP with respect to increasing the bioavailability of insulin following oral administration.
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Affiliation(s)
- Mariko Morishita
- Department of Pharmaceutics, Hoshi University, Ebara 2-4-41, Shinagawa, Tokyo 142-8501, Japan.
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