1. Biocompatibility and characterization of polyglycerol-based thermoresponsive nanogels designed as novel drug-delivery systems and their intracellular localization in keratinocytes.
- Author
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Gerecke C, Edlich A, Giulbudagian M, Schumacher F, Zhang N, Said A, Yealland G, Lohan SB, Neumann F, Meinke MC, Ma N, Calderón M, Hedtrich S, Schäfer-Korting M, and Kleuser B
- Subjects
- Acrylic Resins, Animals, Biocompatible Materials chemistry, Biocompatible Materials toxicity, Cattle, Cell Survival drug effects, Comet Assay, Cornea drug effects, DNA Damage, Drug Carriers chemistry, Drug Carriers toxicity, Erythrocytes drug effects, Hemolysis drug effects, Humans, Keratinocytes drug effects, Microscopy, Confocal, Nanogels, Polyethylene Glycols chemistry, Polyethylene Glycols toxicity, Polyethyleneimine chemistry, Polyethyleneimine toxicity, Primary Cell Culture, Skin Absorption, Temperature, Biocompatible Materials metabolism, Drug Carriers metabolism, Glycerol chemistry, Keratinocytes metabolism, Polyethylene Glycols metabolism, Polyethyleneimine metabolism, Polymers chemistry, Skin metabolism
- Abstract
Novel nanogels that possess the capacity to change their physico-chemical properties in response to external stimuli are promising drug-delivery candidates for the treatment of severe skin diseases. As thermoresponsive nanogels (tNGs) are capable of enhancing penetration through biological barriers such as the stratum corneum and are taken up by keratinocytes of human skin, potential adverse consequences of their exposure must be elucidated. In this study, tNGs were synthesized from dendritic polyglycerol (dPG) and two thermoresponsive polymers. tNG_dPG_tPG are the combination of dPG with poly(glycidyl methyl ether-co-ethyl glycidyl ether) (p(GME-co-EGE)) and tNG_dPG_pNIPAM the one with poly(N-isopropylacrylamide) (pNIPAM). Both thermoresponsive nanogels are able to incorporate high amounts of dexamethasone and tacrolimus, drugs used in the treatment of severe skin diseases. Cellular uptake, intracellular localization and the toxicological properties of the tNGs were comprehensively characterized in primary normal human keratinocytes (NHK) and in spontaneously transformed aneuploid immortal keratinocyte cell line from adult human skin (HaCaT). Laser scanning confocal microscopy revealed fluorescently labeled tNGs entered into the cells and localized predominantly within lysosomal compartments. MTT assay, comet assay and carboxy-H2DCFDA assay, demonstrated neither cytotoxic or genotoxic effects, nor any induction of reactive oxygen species of the tNGs in keratinocytes. In addition, both tNGs were devoid of eye irritation potential as shown by bovine corneal opacity and permeability (BCOP) test and red blood cell (RBC) hemolysis assay. Therefore, our study provides evidence that tNGs are locally well tolerated and underlines their potential for cutaneous drug delivery.
- Published
- 2017
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