Skin permeating nanogel for the cutaneous co-delivery of two anti-inflammatory drugs

Investigation of flurbiprofen pharmacokinetics in rats following dermal administration of optimized cyclodextrin-based nanogel

PURPOSE

The main purpose of this study was to optimize a cyclodextrin-based nanogel of flurbiprofen (FP) for prolonged dermal administration and evaluate its stability, in vitro release, ex vivo skin permeation, and in vivo pharmacokinetic profile.

METHODS

The nanogels were prepared via emulsification/solvent evaporation process and optimized through design of experiments. Optimal formulation was characterized via particle size (PS), polydispersity index (PDI), zeta potential (ZP), differential scanning calorimetry (DSC) and X-ray powder diffraction (XRPD), solubility, stability, in vitro release/ex vivo permeation studies and mathematical modeling, and pharmacokinetic studies conducted in rats. Results were compared to HPMC-based gel that was not nano-sized (i.e.FP-HPMC gel).

RESULTS

The PS, PDI and ZP values of optimal FP-loaded nanogel were 295.5 nm, 0.361 and -31.9 mV, respectively and it was stable for 12 months. In in vitro release studies, the flux from the optimal FP-loaded nanogel (96.3 µg/hcm2) was three times slower (i.e.more controlled) than that of the FP-HPMC gel (287 µg/hcm2); the permeability coefficient of the nanogel (0.015 cm/h) was slightly less than that of FP-HPMC gel (0.046 cm/h). Rat skin studies showed FP-loaded nanogel provided higher drug retention in the skin, compared to FP-HPMC gel. Mathematical modeling from rat skin permeation showed the Hixson-Crowell model was the best fitting model for FP-loaded nanogel, suggesting surface area of the nanogel is changing during the release process. In rat pharmacokinetic studies, the FB-loaded nanogel exhibited prolonged and flatter plasma profile than the FP-HPMC gel, consistent with the higher drug retention in the skin.

CONCLUSION

The optimized nanogel provided prolonged drug permeation and more sustained pharmacokinetic performance compared to FP-HPMC gel.

Nanogel: A versatile drug delivery system for the treatment of various diseases and their future perspective

Nanogel (NG) drug delivery systems have emerged as promising tools for targeted and controlled drug release, revolutionizing treatment approaches across various diseases. Their unique physicochemical properties, such as nano size, high surface area, biocompatibility, stability, and tunable drug release, make them ideal carriers for a wide range of therapeutic agents. Nanogels (NGs), characterized by their 3D network of crosslinked polymers, offer unique edges like high drug loading capacity, controlled release, and targeted delivery. Additionally, the diverse applications of NGs in medical therapeutics highlight their versatility and potential impact on improving patient outcomes. Their application spans cancer treatment, infectious diseases, and chronic conditions, allowing for precise drug delivery to specific tissues or cells, minimizing side effects, and enhancing therapeutic efficacy. Despite their potential, challenges such as scalability, manufacturing reproducibility, and regulatory hurdles must be addressed. Achieving clinical translation requires overcoming these obstacles to ensure therapeutic payloads' safe and efficient delivery. Strategies such as surface modification and incorporating stimuli-responsive elements enhanced NG performance and addressed specific therapeutic challenges. Advances in nanotechnology, biomaterials, and targeted drug design offer opportunities to improve the performance of NGs and address current limitations. Tailoring NGs for exploring combination therapies and integrating diagnostics for real-time monitoring represent promising avenues for future research. In conclusion, NG drug delivery systems have demonstrated tremendous potential in diverse disease applications. Overcoming challenges and leveraging emerging technologies will pave the way for their widespread clinical implementation, ushering in a new era of precision medicine and improved patient care.

Advanced Immunomodulatory Biomaterials for Therapeutic Applications

The multifaceted biological defense system modulating complex immune responses against pathogens and foreign materials plays a critical role in tissue homeostasis and disease progression. Recently developed biomaterials that can specifically regulate immune responses, nanoparticles, graphene, and functional hydrogels have contributed to the advancement of tissue engineering as well as disease treatment. The interaction between innate and adaptive immunity, collectively determining immune responses, can be regulated by mechanobiological recognition and adaptation of immune cells to the extracellular microenvironment. Therefore, applying immunomodulation to tissue regeneration and cancer therapy involves manipulating the properties of biomaterials by tailoring their composition in the context of the immune system. This review provides a comprehensive overview of how the physicochemical attributes of biomaterials determine immune responses, focusing on the physical properties that influence innate and adaptive immunity. This review also underscores the critical aspect of biomaterial-based immune engineering for the development of novel therapeutics and emphasizes the importance of understanding the biomaterials-mediated immunological mechanisms and their role in modulating the immune system.

Hyaluronan-Cholesterol nanogels embedding betamethasone for the treatment of skin inflammatory conditions

Topical application of the glucocorticoid betamethasone (BM) is a common treatment for inflammatory-related skin diseases, such as psoriasis. However, enhancing its bioavailability remains challenging due to poor skin permeability. Herein, we developed and evaluated hyaluronan-cholesterol (HACH) based nanohydrogel systems (NHs) and NHs-Carbopol formulation for dermal delivery of BM. Various parameters were investigated including particle size, surface charge, encapsulation efficiency, in vitro drug release kinetics and stability. The HACH-based NHs demonstrated high encapsulation efficiency, with apparent solubility improved up to 9-fold, small size (∼190 nm) and good stability at 4 ℃ and during long-term storage. Besides, the NHs-Carbopol formulation exhibited excellent rheological properties and an occlusive effect suitable for cutaneous application. Both in-vitro (using Strat-M® membrane) and ex-vivo (using pig ear skin) permeation studies revealed that these formulations significantly improved skin permeation and drug retention in the deeper layers of the epidermis and dermis, making it advantageous for the topical delivery of BM in psoriasis treatment. Moreover, the NHs system demonstrated potential anti-psoriatic activity by downregulating the proinflammatory cytokines in vitro in human keratinocytes (HaCaT cell line) and in an ex vivo 3D skin tissue model (EpiDerm-FT™).

Enhanced skin penetration of curcumin by a nanoemulsion-embedded oligopeptide hydrogel for psoriasis topical therapy

Topical delivery of therapeutics on the skin can effectively alleviate skin symptoms of psoriasis and reduce systemic toxicity. However, the low delivery efficiency caused by the stratum corneum barrier limits the therapeutic impact. Here, we reported an oligopeptide hydrogel that encapsulates cell-penetrating-peptide (CPP)-decorated curcumin-loaded nanoemulsions (Cur-CNEs) to enhance the skin penetration of curcumin for topical treatment of psoriasis. After being applied to the skin of psoriatic mice, the Cur-CNE embedded oligopeptide hydrogel (Cur-CNEs/Gel) provided a prolonged residue time of Cur-CNEs on the skin lesion. The fluidic and elastic properties of the nanoemulsions enabled them to effectively pass through the interstitial spaces of the stratum corneum, while the CPP decoration further enhanced skin penetration and cellular uptake of Cur-CNEs. The Cur-CNEs/Gel exhibits effective alleviation of the symptoms of psoriasis in mice and provides a promising strategy for topical treatment of psoriasis.

Follicular mediated etodolac phosalosomal gel for contact dermatitis alleviation, insights from optimization to in-vivo appraisal

Despite its long history as a preferential cyclooxygenase-2 inhibitor, the topical application of etodolac in inflammatory disorders does not achieve the desired clinical efficiency because of its poor water solubility and poor skin permeation. In the ongoing study, phosalosomes were designed to mitigate the etodolac drawbacks and to enhance its skin localization. Hyaluronic acid was utilized to prepare a dermal gel for the alleviation of skin inflammation. Etodolac loaded hyaluronic acid phosalosomal gel had a sustainable release profile and 10.59-fold enhanced skin retention compared to free etodolac, with boosted skin tolerability on histopathological examination after acute and chronic applications. Confocal laser microscopy imaging indicated that the etodolac amounts accumulated in the liver and kidney following dermal application were 29 and 5.7-fold lower than those following the systemic dose, respectively. For in vivo studies, etodolac loaded hyaluronic acid phosalosomal gel presented superior anti-oedemic and significant anti-nociception potential. The promising homogenous localization highlighted its potential for the delivery of lipophilic drugs for the targeted treatment of other localized skin disorders.

Formulation and dermal delivery of a new active pharmaceutical ingredient in an in vitro wound model for the treatment of chronic ulcers

The aim of this study was to investigate dermal delivery of the new active pharmaceutical ingredient (API) TOP-N53 into diabetic foot ulcer using an in vitro wound model consisting of pig ear dermis and elucidate the impact of drug formulation and wound dressing taking into consideration clinical relevance in the home care setting and possible bacterial infection. Different formulation approaches for the poorly water-soluble API including colloidal solubilization, drug micro-suspension and cosolvent addition were investigated; moreover, the effect of (micro-)viscosity of hydrogels used as primary wound dressing on delivery was assessed. Addition of Transcutol® P as cosolvent to water improved solubility and was significantly superior to all other approaches providing a sustained three-day delivery that reached therapeutic drug levels in the tissue. Solubilization in micelles or liposomes, on the contrary, did not boost delivery while micro-suspensions exhibited sedimentation on the tissue surface. Microbial contamination was responsible for considerable metabolism of the drug leading to tissue penetration of metabolites which may be relevant for therapeutic effect. Use of hydrogels under semi-occlusive conditions significantly reduced drug delivery in a viscosity-dependent fashion. Micro-rheologic analysis of the gels using diffusive wave spectroscopy confirmed the restricted diffusion of drug particles in the gel lattice which correlated with the obtained tissue delivery results. Hence, the advantages of hydrogel dressings from the applicatory characteristic point of view must be weighed against their adverse effect on drug delivery. The employed in vitro wound model was useful for the assessment of drug delivery and the development of a drug therapy concept for chronic diabetic foot ulcer. Mechanistic insights about formulation and dressing performance may be applied to drug delivery in other skin conditions such as digital ulcer.

Secondary metabolites in topical infectious diseases and nanomedicine applications

Topical infection affects nearly one-third of the world's population; it may result from poor sanitation, hygienic conditions and crowded living and working conditions that accelerate the spread of topical infectious diseases. The problems associated with the anti-infective agents are drug resistance and long-term therapy. Secondary metabolites are obtained from plants, microorganisms and animals, but they are metabolized inside the human body. The integration of nanotechnology into secondary metabolites is gaining attention due to their interaction at the subatomic and skin-tissue levels. Hydrogel, liposomes, lipidic nanoparticles, polymeric nanoparticles and metallic nanoparticles are the most suitable carriers for secondary metabolite delivery. Therefore, the present review article extensively discusses the topical applications of nanomedicines for the effective delivery of secondary metabolites.

Polymeric Nanohydrogel in Topical Drug Delivery System

Nanohydrogels (NH) are biodegradable polymers that have been extensively studied and utilized for various biomedical applications. Drugs in a topical medication are absorbed via the skin and carried to the intended location, where they are metabolized and eliminated from the body. With a focus on their pertinent contemporary treatments, this review aims to give a complete overview of recent advances in the creation and application of polymer NH in biomedicine. We will explore the key features that have driven advances in nanotechnology and discuss the significance of nanohydrogel-based formulations as vehicles for delivering therapeutic agents topically. The review will also cover the latest findings and references from the literature to support the advancements in nanotechnological technology related to the preparation and application of NH. In addition, we will also discuss the unique properties and potential applications of NH as drug delivery systems (DDS) for skin applications, underscoring their potential for effective topical therapeutic delivery. The challenge lies in efficiently delivering drugs through the skin's barrier to specific areas with high control. Environmentally sensitive systems, like polymer-based NH, show promise in treating dermatological conditions. Polymers are pivotal in developing these drug delivery systems, with NH offering advantages such as versatile drug loading, controlled release, and enhanced skin penetration.

Self-assembled hyaluronic acid nanoparticles for the topical treatment of inflammatory skin diseases: Beyond drug carriers

Inflammatory skin diseases represent a significant health concern, affecting approximately 20-25% of the global population. These conditions not only reduce an individual's quality of life but also impose a huge burden on both humanity and society. However, addressing these challenges is hindered by their chronic nature, insufficient therapeutic effectiveness, and the propensity for recurrence and adverse side effects. Hyaluronic acid (HA) has emerged as a potential solution to these barriers, owing to its excellent attributes such as biocompatibility, non-toxicity, and targeted drug delivery. However, its practical application has been limited because endogenous hyaluronidase (HYAL) rapidly degrades HA in inflamed skin thus reducing its ability to penetrate deep into the skin. Interestingly, recent research has expanded the role of self-assembled HA-nanoparticles (HA-NPs) beyond drug carriers; they are resistant to HYAL, thereby enabling deep skin penetration, and possess inherent anti-inflammatory properties. Moreover, these abilities can be fine-tuned depending on the conditions during particle synthesis. Additionally, their role as a drug delivery system holds potential for use as a multi-target drug or hybrid drug. In conclusion, this review aims to specifically introduce and highlight the emerging potential of HA-NPs as a topical treatment for inflammatory skin conditions.

Liquid crystalline nanogel targets skin cancer via low-frequency ultrasound treatment

The potential of low-frequency ultrasound (LFU) combined with nanotechnology-based formulations in improving skin tumors topical treatment was investigated. The impact of solid lipid nanoparticles (SLN) and hydrophilic nanogels as coupling media on LFU-induced skin localized transport regions (LTR) and the penetration of doxorubicin (DOX) in LFU-pretreated skin was evaluated. SLN were prepared by the microemulsion technique and liquid crystalline nanogels using Poloxamer. In vitro, the skin was pretreated with LFU until skin resistivity of ∼1 KΩ.cm2 using the various coupling media followed by evaluation of DOX penetration from DOX-nanogel and SLN-DOX in skin layers. Squamous cell carcinoma (SCC) induced in mice was LFU-treated using the nanogel with the LFU tip placed 5 mm or 10 mm from the tumor surface, followed by DOX-nanogel application. LFU with nanogel coupling achieved larger LTR areas than LFU with SLN coupling. In LFU-pretreated skin, DOX-nanogel significantly improved drug penetration to the viable epidermis, while SLN-DOX hindered drug transport through LTR. In vivo, LFU-nanogel pretreatment with the 10 mm tip distance induced significant tumor inhibition and reduced tumor cell numbers and necrosis. These findings suggest the importance of optimizing nanoparticle-based formulations and LFU parameters for the clinical application of LFU technology in skin tumor treatment.

Mucoadhesive, Fluconazole-Loaded Nanogels Complexed with Sulfhydryl-β-cyclodextrin for Oral Thrush Treatment

The objective of this study was to generate fluconazole-loaded mucoadhesive nanogels to address the problem of hydrophobicity of fluconazole (FL). An inclusion complex was formulated with sulfhydryl-β-CD (SH-β-CD) followed by nanogels formation by a Schiff base reaction of carbopol 940 (CA-940) and gelatin (GE). For characterization, PXRD, FT-IR analysis, drug content, and phase solubility studies were performed. Similarly, nanogels were assessed for particle size, zeta potential, organoleptic, and spreadability studies. Moreover, drug contents, rheological, in vitro drug permeation, release kinetics, toxicity, and stability studies of nanogels were performed. Furthermore, mucoadhesive characteristics over the buccal mucosal membrane of the goat were evaluated. The nanogels formulated with a higher amount of CA-940 and subsequently loaded with the inclusion complexes of FL showed promising results. PXRD and FT-IR analysis confirmed the physical complexes by displaying a reduction in the intensity of peaks of FL. The average particle size of nanogels was in the range of 257 to 361 nm. The highest drug content of 88% was encapsulated within the FL-SH-β-CD complex. All formulations at 0.5-1% concentration displayed no toxicity to the Caco-2 cell lines. Nanogels loaded with FL-SH-β-CD complexes showed 18-fold improved mucoadhesion on the buccal mucous membrane of the goat when compared to simple nanogels. The in vitro permeation study exhibited significantly enhanced permeation and first-order concentration-dependent drug release was observed. On the bases of these findings, we can conclude that a mucoadhesive nanogel-based drug delivery system can be an ideal therapy for candidiasis.

Nanogels as novel drug nanocarriers for CNS drug delivery

Nanogels are highly recognized as adaptable drug delivery systems that significantly contribute to improving various therapies and diagnostic examinations for different human diseases. These three-dimensional, hydrophilic cross-linked polymers have the ability to absorb large amounts of water or biological fluids. Due to the growing demand for enhancing current therapies, nanogels have emerged as the next-generation drug delivery system. They effectively address the limitations of conventional drug therapy, such as poor stability, large particle size, and low drug loading efficiency. Nanogels find extensive use in the controlled delivery of therapeutic agents, reducing adverse drug effects and enabling lower therapeutic doses while maintaining enhanced efficacy and patient compliance. They are considered an innovative drug delivery system that highlights the shortcomings of traditional methods. This article covers several topics, including the involvement of nanogels in the nanomedicine sector, their advantages and limitations, ideal properties like biocompatibility, biodegradability, drug loading capacity, particle size, permeability, non-immunological response, and colloidal stability. Additionally, it provides information on nanogel classification, synthesis, drug release mechanisms, and various biological applications. The article also discusses barriers associated with brain targeting and the progress of nanogels as nanocarriers for delivering therapeutic agents to the central nervous system.

Biodegradable Nanogels for Dermal Applications: An Insight

Abstract:

Biodegradable nanogels in the biomedical field are emerging vehicles comprising dispersions of hydrogel nanoparticles having 3D crosslinked polymeric networks. Nanogels show distinguished characteristics including their homogeneity, adjustable size, low toxicity, stability in serum, stimuli-responsiveness (pH, temperature, enzymes, light, etc.), and relatively good drug encapsulation capability. Due to these characteristics, nanogels are referred to as nextgeneration drug delivery systems and are suggested as promising carriers for dermal applications. The site-specific delivery of drugs with effective therapeutic effects is crucial in transdermal drug delivery. The nanogels made from biodegradable polymers can show external stimuliresponsiveness which results in a change in gel volume, water content, colloidal stability, mechanical strength, and other physical and chemical properties, thus improving the site-specific topical drug delivery. This review provides insight into the advances in development, limitations, and therapeutic significance of nanogels formulations. It also highlights the process of release of drugs in response to external stimuli, various biodegradable polymers in the formulation of the nanogels, and dermal applications of nanogels and their role in imaging, anti‐inflammatory therapy, antifungal and antimicrobial therapy, anti‐psoriatic therapy, and ocular and protein/peptide drug delivery.

Biomaterial mediated immunomodulation: An interplay of material environment interaction for ameliorating wound regeneration

Chronic wounds are the outcome of an imbalanced inflammatory response caused by sustenance of immune microenvironment. In this context, tissue engineered graft played great role in healing wounds but faced difficulty in scar remodelling, immune rejection and poor vascularization. All the limitations faced are somewhere linked with the immune cells involved in healing. In this consideration, immunomodulatory biomaterials bridge a large gap with the delivery of modulating factors for triggering key inflammatory cells responsible towards interplay in the wound micro-environment. Inherent physico-chemical properties of biomaterials substantially determine the nature of cell-materials interaction thereby facilitating differential cytokine gradient involved in activation or suppression of inflammatory signalling pathways, and followed by surface marker expression. This review aims to systematically describe the interplay of immune cells involved in different phases in the wound microenvironment and biomaterials. Additionally, it also focuses on modulating innate immune cell responses in the context of triggering the halted phase of the wound healing, i.e., inflammatory phase. The various strategies are highlighted for modulation of wound microenvironment towards wound regeneration including stem cells, cytokines, growth factors, vitamins, and anti-inflammatory agents to induce interactive ability of biomaterials with immune cells. The last section focuses on prospective approaches and current potential strategies for wound regeneration. This includes the development of different models to bridge the gap between mouse models and human patients. Emerging new tools to study inflammatory response owing to biomaterials and novel strategies for modulation of monocyte and macrophage behaviour in the wound environment are also discussed.

Co-Encapsulation of Drugs for Topical Application-A Review

Achieving the best possible outcome for the therapy is the main goal of a medicine. Therefore, nanocarriers and co-delivery strategies were invented to meet this need, as they can benefit many diseases. This approach was applied specifically for cancer treatment, with some success. However, these strategies may benefit many other clinical issues. Skin is the largest and most exposed organ of the human body, with physiological and psychological properties. Due to its exposition and importance, it is not difficult to understand how many skin diseases may impact on patients' lives, representing an important burden for society. Thus, this review aims to summarize the state of the art in research concerning nanocarriers and co-delivery strategies for topical agents' applications targeting skin diseases. The challenge for the medicine of the future is to deliver the drug with spatial and temporal control. Therefore, the co-encapsulation of drugs and the appropriate form of administration for them are so important and remain as unmet needs.

Nanoscale Topical Pharmacotherapy in Management of Psoriasis: Contemporary Research and Scope

Psoriasis is a typical dermal condition that has been anticipated since prehistoric times when it was mistakenly implicit in being a variant of leprosy. It is an atypical organ-specific autoimmune disorder, which is triggered by the activation of T-cells and/or B-cells. Until now, the pathophysiology of this disease is not completely explicated and still, many research investigations are ongoing. Different approaches have been investigated to treat this dreadful skin disease using various anti-psoriatic drugs of different modes of action through smart drug-delivery systems. Nevertheless, there is no ideal therapy for a complete cure of psoriasis owing to the dearth of an ideal drug-delivery system for anti-psoriatic drugs. The conventional pharmacotherapy approaches for the treatment of psoriasis demand various classes of anti-psoriatic drugs with optimum benefit/risk ratio and insignificant untoward effects. The advancement in nanoscale drug delivery had a great impact on the establishment of a nanomedicine-based therapy for better management of psoriasis in recent times. Nanodrug carriers are exploited to design and develop nanomedicine-based therapy for psoriasis. It has a promising future in the improvement of the therapeutic efficacy of conventional anti-psoriatic drugs. The present manuscript aims to discuss the pathophysiology, conventional pharmacotherapy, and contemporary research in the area of nanoscale topical drug delivery systems for better management of psoriasis including the significance of targeted pharmacotherapy in psoriasis.

Development and Characterization of Cyclodextrin-Based Nanogels as a New Ibuprofen Cutaneous Delivery System

Nanogels combine the properties of hydrogels and nanocarrier systems, resulting in very effective drug delivery systems, including for cutaneous applications. Cyclodextrins (CDs) have been utilised to enhance the nanogels' loading ability towards poorly soluble drugs and promote/sustain drug release. However, formation of CD-based nanogels requires the use of specially modified CDs, or of crosslinking agents. The aim of this work was to develop a CD-based nanogel to improve the cutaneous delivery of ibuprofen by using the soluble β-cyclodextrin/epichlorohydrin polymer (EPIβCD) without adding any potentially toxic crosslinker. The use of EPIβCD enabled increasing ibuprofen loading due to its complexing/solubilizing power towards the poorly soluble drug and prolonging drug release over time due to the nanogel formation. DLS analysis proved that EPIβCD allowed the formation of nanostructures ranging from 60 up to 400 nm, depending on the gelling agent type and the gel preparation method. EPIβCD replacement with monomeric HPβCD did not lead in any case to nanogel formation. Permeation experiments using skin-simulating artificial membranes proved that the EPIβCD-based nanogel enhanced ibuprofen solubility and release, increasing its permeation rate up to 3.5 times, compared to a reference formulation without CD and to some commercial gel formulations, and also assured a sustained release. Moreover, EPIβCD replacement with HPβCD led to a marked increase in drug solubility and initial release rate, but did not provide a prolonged release due to the lack of a nano-matrix structure controlling drug diffusion.

Natural polysaccharide-based biodegradable polymeric platforms for transdermal drug delivery system: a critical analysis

Natural biodegradable polymers generally include polysaccharides (starch, alginate, chitin/chitosan, hyaluronic acid derivatives, etc.) and proteins (collagen, gelatin, fibrin, etc.). In transdermal drug delivery systems (TDDS), these polymers play a vital role in controlling the device's drug release. It is possible that natural polymers can be used for TDDS to attain predetermined drug delivery rates due to their physicochemical properties. These polymers can be employed to market products and scale production because they are readily available and inexpensive. As a result of these polymers, new pharmaceutical delivery systems can be developed that is both regulated and targeted. The focus of this article is the application of a biodegradable polymeric platform based on natural polymers for TDDS. Due to their biocompatibility and biodegradability, natural biodegradable polymers are frequently used in biomedical applications. Additionally, these natural biodegradable polymers are being studied for their characteristics and behaviors.

Advances in the modulation of ROS and transdermal administration for anti-psoriatic nanotherapies

Reactive oxygen species (ROS) at supraphysiological concentration have a determinate role in contributing to immuno-metabolic disorders in the epithelial immune microenvironment (EIME) of psoriatic lesions. With an exclusive focus on the gene-oxidative stress environment interaction in the EIME, a comprehensive strategy based on ROS-regulating nanomedicines is greatly anticipated to become the mainstay of anti-psoriasis treatment. This potential therapeutic modality could inhibit the acceleration of psoriasis via remodeling the redox equilibrium and reshaping the EIME. Herein, we present a marked overview of the current progress in the pathomechanisms of psoriasis, with particular concerns on the potential pathogenic role of ROS, which significantly dysregulates redox metabolism of keratinocytes (KCs) and skin-resident or -infiltrating cells. Meanwhile, the emergence of versatile nanomaterial-guided evolution for transdermal drug delivery has been attractive for the percutaneous administration of antipsoriatic therapies in recent years. We emphasize the underlying molecular mechanism of ROS-based nanoreactors for improved therapeutic outcomes against psoriasis and summarize up-to-date progress relating to the advantages and limitations of nanotherapeutic application for transdermal administration, as well as update an insight into potential future directions for nanotherapies in ROS-related skin diseases.

A combination of linalool and linalyl acetate synergistically alleviates imiquimod-induced psoriasis-like skin inflammation in BALB/c mice

Introduction: Psoriasis is a chronic inflammatory skin disorder characterized by keratinocyte hyperproliferation and differentiation with increased immune cell infiltration. The anti-psoriatic effect of lavender oil has been reported. However, its phytoconstituents, linalool (L) and linalyl acetate (LA), showed a distinctive affinity with psoriasis targets.

Objectives: This investigation was aimed to determine the combined effect of L and LA in ameliorating psoriasis-like skin inflammation and its safety in long-term topical uses.

Methods: The combined effect of L and LA was compared with their individual effects. The anti-psoriatic activity was performed using imiquimod (IMQ)-induced psoriasis in BALB/c mice and evaluated to reduce PASI and CosCam scores and Th-1 and Th-17 cell-specific cytokine levels. The acute and repeated dose dermal toxicities were investigated as per the OECD guidelines.

Results: L and LA combination (LLA) in the 1:1 w/w ratio at 2% concentration showed a synergistic effect. The combination showed 76.31% and 71.29% recovery in PASI and CosCam Scores; however, L2% and LA2% showed 64.28% and 47.61% recovery in PASI and 64.75 and 56.76% recovery in CosCam scores, respectively. It showed >90% and >100% recovery in Th-17 and Th-1 cell-specific cytokines, respectively, and restored epidermal hyperplasia and parakeratosis toward normal compared with psoriatic mice. A marked reduction in NF-κB, cck6, and the IL-17 expression was also observed in the LLA-treated group. This combination was safe in a therapeutically effective dose for 28 days as no significant changes were observed in organ and body weights, liver and kidney parameters, and differential leukocyte counts.

Conclusion: This study proves the synergy between L and LA in a 1:1 w/w ratio at 2% in the treatment of psoriasis-like skin inflammation and provides strong scientific evidence for its safe topical use.

Synthesis and Evaluation of Finasteride-Loaded HPMC-Based Nanogels for Transdermal Delivery: A Versatile Nanoscopic Platform

Herein, we report nanogels comprising diverse feed ratio of polymer hydroxypropyl methylcellulose (HPMC), monomer acrylic acid (AA), and cross-linker methylene bisacrylamide (MBA) fabricated for transdermal delivery of finasteride (FIN). Free radical solution polymerization method with subsequent condensation was employed for the synthesis using ammonium per sulfate (APS) and sodium hydrogen sulfite (SHS) as initiators. Carbopol-940 gel (CG) was formulated as assisting platform to deliver FIN nanogels transdermally. Developed formulations were evaluated by several in vitro, ex vivo, and in vivo parameters such as particle size and charge distribution analysis, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), X-ray diffractogram (XRD), rheological testing, in vitro swelling and drug release, and ex vivo skin permeation, irritation, and toxicity assessment. The results endorsed the nanogel formation (117.3 ± 29.113 nm), and the impact of synthesizing method was signified by high yield of nanogels (≈91%). Efficient response for in vitro swelling and FIN release was revealed at pH 5.5 and 7.4. Skin irritation and toxicity assessment ensured the biocompatibility of prepared nanocomposites. On the basis of the results obtained, it can be concluded that the developed nanogels were stable with excellent drug permeation profile across skin.

Nanogel Development and its Application in Transdermal Drug Delivery System

Background:

Nanogels are hydrophilic polymer networks that range in size from 20 to 200 nanometers. Polymer is used to make nanogels, which can be obtained from natural or manu-factured sources. Nanogels can deliver peptides, antigens, carbohydrates, oligonucleotides, proteins, and genes, among other things. These nanogels also provide inorganic materials, such as silver na-noparticles and quantum dots. Both solid and liquid nanogels have the same properties. These nanogels penetrate the stratum corneum more effectively than conventional gels. Dermatology and cosmetology have both experimented with nanoscale technology.

Objective:

The medication can penetrate the stratum corneum through a variety of routes. One of the ways lipids can infiltrate the skin membrane is through the transcellular route. Cream, gel, oint-ment, lotion, thin-film, and foams are among the topical preparations used. Nanogels are catego-rised into two types: those that respond to stimuli and those that cross-link. For the manufacture of nanogels, numerous polymers of synthetic, natural, or semisynthetic origin are commonly em-ployed. Nanoprecipitation, emulsion polymerization, and dispersion polymerization are all ways to make these nanogels. These nanogels are rarely released by diffusion mechanism employing the Fick’s law.

Conclusions:

The nano gel is a new advanced technology that allows to improve drug molecule pen-etration in the stratum corneum. If poorly soluble and permeable medications are administered through this nanogel technology, their solubility and permeability will be improved.

Treatments in psoriasis: from standard pharmacotherapy to nanotechnology therapy

Psoriasis is a genetic chronic disease mediated by the immune system with systemic and cutaneous manifestations that can significantly deteriorate patients' quality of life. Two-three percent of the population worldwide suffer from psoriasis and it imposes a substantial economic burden on patients. The aetiology is mainly related with genes and environmental factors. The pathophysiology of psoriasis is characterized by T cells and dendritic cells, antimicrobial peptides, genetic predispositions, lipoprotein-2, galactosin-3, fractalkine, vaspin, and human neutrophilic peptides, etc. in the progression of psoriasis. For patients with psoriasis, the traditional treatments include corticosteroids, vitamin D3 analogues, calcineurin inhibitors, methotrexate, cyclosporine, acitretin, phototherapy, and biological agents, etc. Nanodermatology is an emerging, multidisciplinary science that is gaining increasing recognition in the treatment of psoriasis. This review provides a summary of the pathophysiology, epidemiology, clinical diagnosis, and classical pharmacotherapy of psoriasis. The review also summarizes different nanotechnology therapies for effective treatment of psoriasis.

Promising role of topical caffeine mesoporous gel in collagen resynthesis and UV protection through proline assessment

Background

Caffeine, an alkaloid agent, has been globally used regularly in drinks, for the reduction in skin cancers and wrinkle formation. As a result of the previous, attempts have been carried out to use caffeine in cosmetology due to its antioxidant and UV ray protection effects. Our aim was to evaluate the effect of caffeine on collagen resynthesis via its effect on proline and prolidase biosynthesis on mice, orally and topically as mesoporous silica at three levels, and the influence on UV protection. In skin biopsies of orally and topically treated mice, the following was assessed using ELISA and Western blot techniques, the activity of prolidase, together with the concentrations of proline, beta integrin, insulin growth factor, protein kinases beta, and mitogen-activated protein kinase. Moreover, we loaded the caffeine on mesoporous silica and assessed the aforementioned parameters together with checkpoint kinase 1 and Rad3-related protein.

Results

Caffeine promoted collagen resynthesis in a dose-dependent manner. The mechanism of this process was found at the level of prolidase activity as caffeine significantly increased the enzyme activity. Caffeine also had a protective effect against UV exhibited by the over-expression of beta integrin, insulin growth factor together with the under-expression of protein kinases beta, mitogen-activated protein kinase, checkpoint kinase 1, and Rad3-related protein.

Conclusions

Our study revealed the superiority of SYL-C12 (mesoporous silica-loaded caffeine gel), compromising the high level of the three independent factors, in terms of the measured responses in mesoporous silica with caffeine. Moreover, caffeine promoted collagen resynthesis with significant protective effect against UV apoptotic damage.

A multifunctional composite hydrogel as an intrinsic and extrinsic coregulator for enhanced therapeutic efficacy for psoriasis

Background

Psoriasis is a chronic relapsing immunological skin disease characterized by multiple cross-talk inflammatory circuits which are relevantly associated with abnormal cross-reactivity between immune cells and keratinocytes (KCs). It may be inadequate to eradicate complicated pathogenesis only via single-mode therapy. To provide optimal combinatory therapeutics, a nanocomposite-based hydrogel was constructed by loading methotrexate (MTX) into ZnO/Ag to realize combined multiple target therapy of psoriasis.

Results

In this composite hydrogel, ZnO hybrid mesoporous microspheres were utilized both as drug carriers and reactive oxygen species (ROS)-scavenging nanoparticles. A proper amount of Ag nanoparticle-anchored ZnO nanoparticles (ZnO/Ag) was functionalized with inherent immunoregulatory property. The experiments showed that ZnO/Ag nanoparticles could exhibit a self-therapeutic effect that was attributed to reducing innate cytokine profiles by inactivating p65 in proinflammatory macrophages and abrogating secretion of adaptive cytokines in KCs by downregulating ROS-mediated STAT3-cyclin D1 signaling. A preferable antipsoriatic efficacy was achieved via topical administration of this hydrogel on the imiquimod (IMQ)-induced psoriasis mice model, demonstrating the superior transdermal delivery and combined enhancement of therapeutic efficacy caused by intrinsic nanoparticles and extrinsic MTX.

Conclusion

This composite hydrogel could serve as a multifunctional, nonirritating, noninvasive and effective transcutaneous nanoagent against psoriasis.

Graphical Abstract

Supplementary Information

The online version contains supplementary material available at 10.1186/s12951-022-01368-y.

Transdermal Delivery of Therapeutic Compounds With Nanotechnological Approaches in Psoriasis

Psoriasis is a chronic, immune-mediated skin disorder involving hyperproliferation of the keratinocytes in the epidermis. As complex as its pathophysiology, the optimal treatment for psoriasis remains unsatisfactorily addressed. Though systemic administration of biological agents has made an impressive stride in moderate-to-severe psoriasis, a considerable portion of psoriatic conditions were left unresolved, mainly due to adverse effects from systemic drug administration or insufficient drug delivery across a highly packed stratum corneum via topical therapies. Along with the advances in nanotechnologies, the incorporation of nanomaterials as topical drug carriers opens an obvious prospect for the development of antipsoriatic topicals. Hence, this review aims to distinguish the benefits and weaknesses of individual nanostructures when applied as topical antipsoriatics in preclinical psoriatic models. In view of specific features of each nanostructure, we propose that a proper combination of distinctive nanomaterials according to the physicochemical properties of loaded drugs and clinical features of psoriatic patients is becoming a promising option that potentially drives the translation of nanomaterials from bench to bedside with improved transdermal drug delivery and consequently therapeutic effects.

Nanocarriers for Skin Applications: Where Do We Stand?

Skin penetration of active molecules for treatment of diverse diseases is a major field of research owing to the advantages associated with the skin like easy accessibility, reduced systemic-derived side effects, and increased therapeutic efficacy. Despite these advantages, dermal drug delivery is generally challenging due to the low skin permeability of therapeutics. Although various methods have been developed to improve skin penetration and permeation of therapeutics, they are usually aggressive and could lead to irreversible damage to the stratum corneum. Nanosized carrier systems represent an alternative approach for current technologies, with minimal damage to the natural barrier function of skin. In this Review, the use of nanoparticles to deliver drug molecules, genetic material, and vaccines into the skin is discussed. In addition, nanotoxicology studies and the recent clinical development of nanoparticles are highlighted to shed light on their potential to undergo market translation.

Topical Application of Vitamin D3-Loaded Hybrid Nanosystem to Offset Imiquimod-Induced Psoriasis

Lipid-polymer hybrid nanoparticles display several benefits over either lipid and/or polymer based systems with respect to enhanced drug loading, good colloidal stability, sustained release profile, and high cellular uptake. The present work rivets on development and evaluation of vitamin D₃-loaded monolithic lipid-polymer hybrid nanoparticles (VD3/LPHNPs) for their in vivo anti-psoriatic efficacy. These LPHNPs were prepared using a hot homogenization method and exhibited spherical morphology with a lower particle size (123.1 nm) with narrow PDI (0.234) and efficient encapsulation (76.80%). Further, these LPHNPs demonstrated a sustained release profile of VD3 for up to 3 days following a Korsemeyer-Peppas release model. Further, VD3/LPHNPs were formulated into a topical gel containing 0.005% w/w of VD3. Rheological data suggested that the product exhibited non-newtonian flow properties with characteristic shear-thinning and variable thixotropy features that are desirable for topical formulation. The successful formation of gel structure and its long-term stability were confirmed from the oscillatory studies such as amplitude and frequency sweep tests. In vivo efficacy assessment in imiquimod-induced psoriatic mouse model demonstrated enhanced anti-psoriatic activity of VD3 with improved PASI score when delivered as LPHNPs gel as compared to the free VD3 gel that were further supported by histopathology and immunohistochemistry.

Nanosystems as curative platforms for allergic disorder management

Allergy, IgE-mediated inflammatory disorders including allergic rhinitis, asthma, and conjunctivitis, affects billions of people worldwide. Conventional means of allergy management include allergen avoidance, pharmacotherapy, and emerging therapies. Among them, chemotherapeutant intake via oral, intravenous, and intranasal routes is always the most common mean. Although current pharmacotherapy exhibit splendid anti-allergic effects, short in situ retention, low bioavailability, and systemic side effects are inevitable. Nowadays, nanoplatforms have provided alternative therapeutic options to obviate the existing weakness via enhancing the solubility of hydrophobic therapeutic agents, achieving in situ drug accumulation, exhibiting controlled and long-time drug release at lesion areas, and providing multi-functional therapeutic strategies. Herein, we highlight the clinical therapeutic strategies and deal with characteristics of the nanoplatform design in allergy interventions via intratracheal, gastrointestinal, intravenous, and ocular paths. The promising therapeutic utilization in a variety of allergic disorders is discussed, and recent perspectives on the feasible advances of nanoplatforms in allergy management are also exploited.

Emulgel for improved topical delivery of Tretinoin: Formulation design and characterization

OBJECTIVES

The chief objective of the present research was to reduce local side effects by reducing the dose, controlling the release, and improving the stability by developing and optimizing tretinoin (TRT)-loaded topical emulgel formulation.

METHODS

TRT emulgel (TE) was prepared and optimized at varying ratios of excipients and using 3² optimal response surface design (ORSD). The TRT emulgel was optimized based on TRT content and in vitro release profile of TRT from formulated emulgel batches. The optimized TRT was characterized for physical properties, pH, viscosity, spreadability, extrudability, photomicroscopy, in vitro anti-acne, in vivo skin irritation, in vivo anti-inflammatory activity, and stability study.

RESULTS

The FTIR and DSC analysis revealed the compatibility between TRT and formulation excipients of emulgel. The batch F5 of emulgel formulation displayed maximum drug content (98.69±1.26%), and controlled TRT release (78.27±0.69%). Thus, batch F5 was selected as an optimized batch for further characterization. The photomicroscopic analysis of optimized TE exhibited the presence of spherical globules. The pH and viscosity of optimized TE were found to be 6.20±0.12 and 3240cP respectively. Besides, the optimized TE showed good spreadability and extrudability. The in vitro anti-acne activity against Propionibacterium acne (P. acne) of optimized TE (diameter of zone of inhibition 34.54±0.26mm) was found to be the comparatively same as that of marketed Sotret® gel (diameter of zone of inhibition 36.13±0.43mm). Moreover, no sign of irritation was observed in rats treated with optimized TE indicating the safety of TE. Furthermore, the optimized TE displayed significant (p<0.01) in vivo anti-inflammatory activity when compared to marketed gel. Besides, optimized TE was found to be stable when stored in cool conditions for three months.

CONCLUSION

Thus, the emulgel could be a promising approach for the topical delivery of TRT with improved performance and reduced side effects.

Optimizing Anti-inflammatory Activities of Arabica Coffee Ground (Coffea arabica L.) Nanoparticle Gel

Background: Arabica coffee ground nanoparticles gel is known to possess good physicochemical properties and high phenolic contents in which the phenolics are famous for their anti-inflammatory activities. Objectives: : This study aimed to investigate the anti-inflammatory activities of the arabica coffee ground nanoparticles gel on carrageenan-induced male mice for 6 h. The positive control was commercial medicine (Voltaren gel), and the control negative was base gel. Methods: The inflammatory inhibition of arabica coffee ground nanoparticles gel is determined by measuring the edema volume of the carrageenan-induced mice foot using a plethysmometer. Anti-inflammatory activities of arabica coffee ground nanoparticles gel were optimized using Box-Behnken Design of the response surface methodology. Results: The anti-inflammatory activities or inflammatory inhibition of arabica coffee ground nanoparticles gel was determined by measuring the edema volume of the carrageenan-induced mice foot. The increase of edema volume of the mice foot from the first to 180th min was caused by the release of inflammation mediator such as histamine, prostaglandins, bradykinins, and serotonin on the tissue; meanwhile, at the 240th min, the edema of the mice foot experienced a decrease due to the inhibition of prostaglandins synthesis to the tissue. The obtained results indicated that the arabica coffee ground nanoparticles gel has average value of anti-inflammatory activities of 27.75%. The obtained optimum formulation is 0.500% Carbopol 940, 0.400% triethanolamine, and 2.313% nanoparticle, giving 29.360% and 29.670% for the predicted and experimental inflammatory inhibition values, with 0.812 desirability value, respectively. Conclusions: The Box-Behnken design can be used to determine the optimal gel formulation of arabica coffee grounds for inflammatory inhibition.

Polymers in topical delivery of anti-psoriatic medications and other topical agents in overcoming the barriers of conventional treatment strategies

In recent decades, topical treatments to dermal disorders have shown ineffectiveness in delivering the medication at a particular location without a suitable drug carrier. Psoriasis treatment is hindered because of the ineffective delivery and efficacy of conventional pharmaceutical treatment. In conventional medication formulation approach, it is difficult to breach the transdermal layer of a skin membrane for topical drugs, i.e. cyclosporine, methotrexate. This problem is further complicated by extreme disease-associated conditions such as hyperkeratosis and irritation. Intending to assure better drug delivery carriers, this review emphasizes the therapeutic efficacy of polymers and their potential to deliver the drug into the deeper layer of the skin membrane. The polymers are essential in structural and physiochemical perspectives as it works as a carrier for the medication. A vast variety of delivery carriers is available nowadays but their applicability in such dermal cases like psoriasis is still lacking due to less knowledge on an appropriate polymer. The current investigation of suitable polymer would assist in brushing our expertise to optimize the advantages of a wide spectrum of polymers to fulfill the topical targeting of psoriasis.

Design and characterization of Nanostructured lipid carriers (NLC) and Nanostructured lipid carrier-based hydrogels containing Passiflora edulis seeds oil

This study aims to design and characterize Nanostructured lipid carriers (NLC) and Nanostructured lipid carrier-based hydrogels with Passiflora edulis seeds oil, a by-product from Madeira Island food industry. NLC were prepared by the ultrasonication technique, using passion fruit seeds oil as a liquid lipid and glyceryl distearate as a solid lipid. These NLC were then gelled with Poly (acrylic acid). Long-term stability studies were conducted with NLC and NLC-based hydrogels stored for 12 months. The following tests were performed: morphology, encapsulation efficiency, particle size analysis, polydispersity index analysis, zeta potential, pH measurement, color analysis, viscosity studies, texture analysis, in vitro occlusion test, ex vivo skin penetration study, tyrosinase inhibition activity, in vitro skin permeation experiments and in vitro cytotoxicity studies. The developed NLC had spherical shape and narrow particle sizes distribution with mean sizes in the range of 150 nm and PDI below 0.3, Zeta potential values around -30 mV and high Encapsulation efficiency. The tyrosinase inhibitory activity and skin retention of the nanoparticles was superior to that of the non-encapsulated oil. The developed formulations did not show cytotoxicity towards HaCat cells and presented suitable viscosity and texture properties for skin application, proving to be good candidates as depigmenting agent.

Anti-psoriatic effect of Lavandula angustifolia essential oil and its major components linalool and linalyl acetate

ETHNO-PHARMACOLOGICAL RELEVANCE

Lavender oil (LO) is an aromatic/essential oil extracted from Lavandula angustifolia and traditionally used as an aromatherapy massage oil due to its anti-inflammatory and wound healing property and also for providing the relief in other skin conditions such as psoriasis, dermatitis and eczema. However, LO has not been evaluated scientifically for psoriasis like skin inflammation.

AIM OF THE STUDY

This study was aimed to investigate the LO and its major components linalool (L) and linalyl acetate (LA) against psoriasis like skin inflammation.

MATERIALS AND METHODS

Anti-psoriatic activity was done using Imiquimod (IMQ) induced psoriasis like skin inflammation in BALB/c mice. Assessment of anti-psoriatic effect of LO, L and LA was done on the basis of change in ear thickness, psoriasis area severity index (PASI) scoring at alternative day, CosCam scoring using skin analyzer equipped with SkinSys software, biochemical, immunohistochemical and histological investigations. Level of effectiveness against psoriasis was investigated by percent reduction in PASI scores, CosCam scores and level of Th-1 and Th-17 cell expressing cytokines, as compared to the diseased mice.

RESULTS

Topical application of LO 10% showed 73.67% recovery in PASI and 87% in Th-17 cell-specific cytokines towards normal as compared to disease group. L and LA were identified as the major components of LO and favoured ligands for selected psoriasis targets. At 2% topical dose, L and LA showed 64% and 47.61% recovery in PASI scores, respectively. Both, L and LA showed significant recovery in Th-1 specific TNF-α and IL-1β however, only L showed significant recovery of Th-17 cytokines (IL-17 and IL-22). In contrast to LA (which restored granulosis), L restored epidermal hyperplasia and parakeratosis toward the normal condition. On the other hand, L also reduced the expression of NF-κβ, ccr6 and IL-17, while LA reduced the expression of NF-κβ only. At 10% topical dose, LO was observed to be slight irritant while at 2% topical dose, L and LA were found non-irritant to the skin.

CONCLUSION

This study proves the effectiveness of LO and its major phytoconstituents linalool and linalyl acetate against IMQ induced psoriasis like skin inflammation and provides the scientific evidence for topical use of lavender oil.

Multi-component clobetasol-loaded monolithic lipid-polymer hybrid nanoparticles ameliorate imiquimod-induced psoriasis-like skin inflammation in Swiss albino mice

Lipid-polymer hybrid nanoparticles (LPNs) exhibit several advantages over polymeric and non-polymeric systems in terms of improved drug loading, controlled release, stability, and cellular uptake. Herein we report a scalable and stable monolithic lipid-polymer hybrid nanoparticles (LPNs) consisting of a combination of lipids (solid and liquid) and an amphiphilic copolymer, mPEG-PLA. Clobetasol propionate, a topical corticosteroid, was encapsulated in the hydrophobic core of these LPNs that showed spherical shaped particles with a z-average size of 94.8 nm (PDI = 0.213) and encapsulation efficiency of 84.3%. These clobetasol loaded LPNs (CP/LPNs) were formulated into a topical hydrogel using carbopol 974P. CP/LPNs gel showed a sustained in vitro clobetasol release for 7 days with no burst release and 6 month stability at 2-8°C and room temperature. Further, CP/LPNs showed an improved cellular uptake with significant growth inhibition of HaCaT cells. In ex vivo studies, these LPNs penetrated into the viable epidermis and dermis region of the psoriatic skin with undetectable quantities leaching to the reservoir. Further, the topical application of CP/LPNs gel on Swiss albino mice with psoriasis-like inflammation showed negligible leaching of clobetasol into the systemic circulation. Efficacy assessment showed significantly improved PASI score, reduced skin damage and proliferation after treatment with CP/LPNs gel as compared to marketed product (Clobetamos™). Collectively, the enhanced cellular uptake, high skin penetration with increased skin retention, and improved efficacy demonstrate the potential of these LPNs for future clinical application.

Systematic development and characterization of curcumin-loaded nanogel for topical application

Curcumin (CUR) conventional formulation has poor oral bioavailability due to low solubility and low stability. Also, it extensively undergoes first-pass-metabolism showing low biological activity. The present work focuses on the systematic development and characterization of CUR-loaded Nanostructured Lipid Carrier (CUR-NLCs) having promising topical applications for skin diseases such as psoriasis. CUR-NLCs were prepared by using high-speed homogenization method. Quality by design approach was exploited to select out Critical Process Parameters i.e. homogenization speed (X1), homogenization time (X2), amount of lipid (X3), solid lipids (SL): liquid lipids (LL) (X4), and surfactant conc. (X5) using Plackett-Burman design and for obtaining critical quality attributes i.e. particle size (Y1) and entrapment efficiency (Y2) using Box-Behnken design. The developed NLCs were found to be nano-metric in size (189.4 ± 2.6 nm) with a low polydispersity index (0.262 ± 0.24), zeta potential (-21.45 ± 1.3 mV), and showed good encapsulation efficiency (86.72 ± 09%). Surface morphology determined by SEM and AFM revealed the spherical shape of the NLCs with a smooth surface. XRD studies showed NLCs in the amorphous state. After incorporation of NLCs into a nanogel, it was characterized for pH, rheological behavior, spreadability, in vitro occlusion, and in vitro release kinetics. The drug release from NLC in 24 h was found to be 60.2 ± 0.45% indicating a sustained release pattern. Ex vivo permeation studies revealed a good permeation flux (0.453 ± 0.76 µg/cm2.h) and retention (60.2 ± 0.45%) of CUR in the skin epidermis. Thus, developed CUR-NLCs can be a potential delivery system and a promising therapeutic approach for the effective treatment of psoriasis.

Non-invasive drug delivery technology: development and current status of transdermal drug delivery devices, techniques and biomedical applications

Pay-load deliveries across the skin barrier to the systemic circulation have been one of the most challenging delivery options. Necessitated requirements of the skin and facilitated skin layer cross-over delivery attempts have resulted in development of different non-invasive, non-oral methods, devices and systems which have been standardized, concurrently used and are in continuous upgrade and improvements. Iontophoresis, electroporation, sonophoresis, magnetophoresis, dermal patches, nanocarriers, needled and needle-less shots, and injectors are among some of the methods of transdermal delivery. The current review covers the current state of the art, merits and shortcomings of the systems, devices and transdermal delivery patches, including drugs' and other payloads' passage facilitation techniques, permeation and absorption feasibility studies, as well as physicochemical properties affecting the delivery through different transdermal modes along with examples of drugs, vaccines, genes and other payloads.

Advanced Characterization of Imiquimod-Induced Psoriasis-Like Mouse Model

Many autoimmune disorders such as psoriasis lead to the alteration of skin components which generally manifests as unwanted topical symptoms. One of the most widely approved psoriasis-like animal models is the imiquimod (IMQ)-induced mouse model. This representation mimics various aspects of the complex cutaneous pathology and could be appropriate for testing topical treatment options. We perform a thorough characterization of this model by assessing some parameters that are not fully described in the literature, namely a precise description of skin disruption. It was evaluated by transepidermal water loss measurements and analyses of epidermis swelling as a consequence of keratinocyte hyperproliferation. The extent of neo-angiogenesis and hypervascularity in dermis were highlighted by immunostaining. Moreover, we investigated systemic inflammation through cytokines levels, spleen swelling and germinal centers appearance in draining lymph nodes. The severity of all parameters was correlated to IMQ concentration in skin samples. This study outlines new parameters of interest useful to assess this model. We highlight the skin barrier disruption and report a systemic inflammatory reaction occurring at distance both in spleen and lymph nodes. These newly identified biological endpoints could be exploited to investigate the efficacy of therapeutic candidates for psoriasis and more extensively for several other skin inflammatory diseases.

Anti-inflammatory Activity of Curcumin in Gel Carriers on Mice with Atrial Edema

Curcumin is a bioactive compound with proven antioxidant and anti-inflammatory activities, but has low water solubility and dermal absorption. The inflammatory process is considered as the biological response to damage induced by various stimuli. If this process fails to self-regulate, it becomes a potential risk of cancer. The objective of this work was to evaluate the anti-inflammatory activity of curcumin administered to mice with induced atrial edema using two topical vehicles: organogels and O/W-type nanogels at pH 7, Organogels and O/W-type nanogels at pH 7 were prepared, characterized and the anti-inflammatory activity was assessed. A histopathological analysis of mouse ears was performed and two gel formulations were selected. Thermograms of organogels indicated that increasing the gelling agent improved the stability of the system. Deformation sweeps confirmed a viscoelastic behavior characteristic of gels in both systems. During the anti-inflammatory activity evaluations, the nanogels demonstrated greater activity (61.8 %) than organogels; Diclofenac^® (2-(2,6-dichloranilino) phenylacetic acid), used as a control medication achieved the highest inhibition (85.4%); however, the drug produced the death of 2 (40%) of the study subjects caused by secondary adverse events. Histopathological analysis confirmed the data.

Potential of Nanoparticles as Permeation Enhancers and Targeted Delivery Options for Skin: Advantages and Disadvantages

The topical route of administration has many advantages for the treatment of various skin disorders as well as cosmeceutical purposes. This route bypasses hepatic first-pass effect and systemic availability of many pharmaceuticals is limited to skin organelles such as hair follicles and so could avoid unwanted adverse reactions and increase the localized therapeutic effect. Despite such attributed advantages of the topical route, the most important challenge is skin barrier characteristics that should be overcome to obtain dermal or trans-dermal drug delivery. Different approaches have been recruited to overcome this barrier. In this review, different types of nanoparticles for skin permeation enhancement and targeted delivery to skin organelles are discussed. The potential mechanisms of each nanocarrier in permeation enhancement and dermal delivery are considered and finally, the most important advantages and disadvantages of each group are summarized.