New hybrid liposomes based on cationic amphiphiles with different structures of the head group (cetyltrimethylammonium bromide (CTAB), 3-hexadecyl-1-hydroxyethylimidazolium bromide (IA-16(OH)), 1-(butylcarbamoyl)oxyethyl-3-hexadecylimidazolium bromide (IAC 16(Bu)), and hexadecylmethylpyrrolidinium bromide (PR-16)) were developed for transdermal administration of nonsteroidal anti-inflammatory drugs. The different surfactant/lipid compositions were studied to obtain stable liposomes with high functionality. The hydrodynamic diameter of cationic liposomes was ∼110 nm. An admixture of cationic surfactants and PC liposomes improves the physicochemical properties of vesicles and transdermal diffusion rate and prolongs the release of drugs. Liposomal diclofenac sodium (DS) and ketoprofen (KP) were tested (using Franz cells) for transdermal penetration. Drug diffusion monitoring for 48 h demonstrated that the maximum DS and KP penetration through the synthetic membranes (Strat-M) is characterized by values of 255 ± 2 and 186 ± 3 μg/cm², respectively. The influence of the surfactant head group on the properties (stability, release profile, permeability) of cationic liposomes was shown for the first time. While the drug specificity is evident for the rate of release, the permeability increases as follows: conventional liposomes < CTAB/PC < PR-16/PC < IAC-16(Bu)/PC < IA-16(OH)/PC for both medicines. The rat paw edema model was used to assess the anti-inflammatory effect of the IA-16(OH)/PC leader formulation in vivo. It was found that liposomal DS and KP are effective for relieving rat paw edema. It should be noted that DS-loaded hybrid liposomes demonstrated the highest therapeutic efficacy compared to conventional vesicles.

The review focuses on the lipid based nanocarriers, with special attention paid to natural bioactive payloads. First, micelles and microemulsions are considered as very attractive colloidal nanocontainers that allow for marked improving the solubility of hydrophobic bioactives. Further, liposomal vehicles are reviewed, with both advantages and limitations discussed. Literature assay covers up-to-date information of about last three to five years, although brief background is given on the pioneer works addressing the liposomes and their evolution from bench to bedside. Final part of the review is devoted to the modern modifications of vesicular nanocarriers which can be adapted to specific administration way due to improved targeting properties, permeability, mucoadhesiveness and possibility to cross biological barriers. Therein, such kinds of nanocarriers as transfersomes, niosomes, ethosomes, chitosomes are evaluated; and separate sections focus on the natural based formulations, i.e., phytosomes and invasomes.

Chitosan-decorated liposomes were proposed for the first time for the intranasal delivery of acetylcholinesterase (AChE) reactivator pralidoxime chloride (2-PAM) to the brain as a therapy for organophosphorus compounds (OPs) poisoning. Firstly, the chitosome composition based on phospholipids, cholesterol, chitosans (Cs) of different molecular weights, and its arginine derivative was developed and optimized. The use of the polymer modification led to an increase in the encapsulation efficiency toward rhodamine B (RhB; ~85%) and 2-PAM (~60%) by 20% compared to conventional liposomes. The formation of monodispersed and stable nanosized particles with a hydrodynamic diameter of up to 130 nm was shown using dynamic light scattering. The addition of the polymers recharged the liposome surface (from −15 mV to +20 mV), which demonstrates the successful deposition of Cs on the vesicles. In vitro spectrophotometric analysis showed a slow release of substrates (RhB and 2-PAM) from the nanocontainers, while the concentration and Cs type did not significantly affect the chitosome permeability. Flow cytometry and fluorescence microscopy qualitatively and quantitatively demonstrated the penetration of the developed chitosomes into normal Chang liver and M-HeLa cervical cancer cells. At the final stage, the ability of the formulated 2-PAM to reactivate brain AChE was assessed in a model of paraoxon-induced poisoning in an in vivo test. Intranasal administration of 2-PAM-containing chitosomes allows it to reach the degree of enzyme reactivation up to 35 ± 4%.

This review covers nanotherapeutic strategies for solving the global problems associated with Alzheimer's disease (AD). The most dramatic factor contributing humanistic, social and economic urgency of the situation is the incurability of the disease, with the drug intervention addressing only AD symptoms and retarding their progress. Key sources behind these challenges are the inability of the early diagnosis of AD, the lack of comprehensive information on the molecular mechanism of the pathogenesis, the bloodbrain barrier obstacles, and the insufficient effectiveness of currently available drugs and therapeutic strategies. The application of nanocarriers allows part of these problems to be solved, together with the improvement of drug bioavailability, prolonged circulation, and overcoming/bypassing the biological barriers. To this date, numerous types and subtypes of nanocarriers are developed and reviewed, the majority of which can be adapted for the treatment of various diseases. Therefore, herein, nanotherapy strategies are specifically categorized in term of the administration routes of AD medicines, with the noninvasive, i.e., transdermal, oral, and intranasal routes emphasized. Further, benefits/ limitations of various nanocarriers are discussed, and perspectives of their application are highlighted.