Insight into pulmonary drug delivery: Mechanism of drug deposition to device characterization and regulatory requirements

2019 ◽  
Vol 54 ◽  
pp. 1-21 ◽  
Author(s):  
Nagarjun Rangaraj ◽  
Sravanthi Reddy Pailla ◽  
Sunitha Sampathi
2018 ◽  
Vol 24 (21) ◽  
pp. 2438-2455 ◽  
Author(s):  
Preshita P. Desai ◽  
Sanyat S. Mapara ◽  
Vandana B. Patravale

Background and objective: Pulmonary drug delivery has transformed over a past few decades from being a platform for local pulmonary disease treatment to systemic drug delivery opportunities. In case of pulmonary delivery systems, particle properties are critical as they affect inhalation efficacy, pulmonary deposition, drug delivery and overall performance. With this in view, particle engineering has emerged as an advanced science that helps in designing of efficacious pulmonary delivery systems. Among various particle engineering branches, crystal engineering is being extensively explored as it provides an opportunity to optimize particles at morphological, physicochemical and molecular levels which are essential to understand the role of crystal engineering in pulmonary drug delivery. Methods: A thorough literature survey in the field of crystal engineering approaches explored for pulmonary drug delivery was conducted and the collected data was meticulously studied and summarized. Results: In the review, pulmonary system is discussed with respect to various sites for drug deposition in respiratory tract, mechanism of drug deposition and clearance. Further, critical crystal parameters are discussed in-depth and various crystal engineering methods are summarized with emphasis on their impact on pulmonary delivery. Also, inhalation devices are overviewed to understand their performance in relation to crystal based pulmonary formulations. Conclusion: The review enabled a detailed insight on crystal engineering approaches for design of pulmonary delivery systems.


Author(s):  
K. M. Aguilar-Pérez ◽  
J. I. Avilés-Castrillo ◽  
Dora I. Medina ◽  
Roberto Parra-Saldivar ◽  
Hafiz M. N. Iqbal

The necessity to develop more efficient, biocompatible, patient compliance, and safer treatments in biomedical settings is receiving special attention using nanotechnology as a potential platform to design new drug delivery systems (DDS). Despite the broad range of nanocarrier systems in drug delivery, lack of biocompatibility, poor penetration, low entrapment efficiency, and toxicity are significant challenges that remain to address. Such practices are even more demanding when bioactive agents are intended to be loaded on a nanocarrier system, especially for topical treatment purposes. For the aforesaid reasons, the search for more efficient nano-vesicular systems, such as nanoliposomes, with a high biocompatibility index and controlled releases has increased considerably in the past few decades. Owing to the stratum corneum layer barrier of the skin, the in-practice conventional/conformist drug delivery methods are inefficient, and the effect of the administered therapeutic cues is limited. The current advancement at the nanoscale has transformed the drug delivery sector. Nanoliposomes, as robust nanocarriers, are becoming popular for biomedical applications because of safety, patient compliance, and quick action. Herein, we reviewed state-of-the-art nanoliposomes as a smart and sophisticated drug delivery approach. Following a brief introduction, the drug delivery mechanism of nanoliposomes is discussed with suitable examples for the treatment of numerous diseases with a brief emphasis on fungal infections. The latter half of the work is focused on the applied perspective and clinical translation of nanoliposomes. Furthermore, a detailed overview of clinical applications and future perspectives has been included in this review.


2020 ◽  
Vol 11 (3) ◽  
pp. 10099-10118

Lower respiratory infections are the third leading cause of death, as stated by the world health organization. The pulmonary route requires reduced dose, exhibits immediate drug release, reduced first-pass hepatic metabolism and adverse effects, and systemic drug release. Therefore, an overview of recent advancements in inhalable microparticles reported in publications and patents published in the last few years has been summarized. Recent innovations in inhaler technology and major challenges in pulmonary drug delivery have been discussed briefly. The analysis was collected through comprehensive literature searches from databases such as PubMed, Google Scholar, and ScienceDirect. The recent patents on inhalable microparticles have been compiled through the PATENTSCOPE database via WIPO website. The keywords used in the search strategy were ‘inhalable microparticles’, ‘polymeric microparticles’, ‘large porous microparticles’, ‘solid lipid microparticles’, ‘cyclodextrin complex microparticles’, ‘respiratory disorders’, ‘patent, ‘inhaler technology’, ‘drug deposition’, ‘pharmacokinetic processes’ and ‘pulmonary drug delivery’ in various combinations. A survey of literature revealed that 44 publications and 14 patents, and 9 recent innovations in inhaler technology had been reported regarding inhalable microparticles in respiratory disorders. This review briefly recapitulates the pharmacokinetic processes involved in the pulmonary drug delivery route, mechanisms of drug deposition in the respiratory tract, types, and production methodology of inhalable microparticles.


2020 ◽  
Vol 20 (3) ◽  
pp. 195-206 ◽  
Author(s):  
Shriya Agarwal ◽  
Vinayak Agarwal ◽  
Mugdha Agarwal ◽  
Manisha Singh

Abstract: In recent times, several approaches for targeted gene therapy (GT) had been studied. However, the emergence of extracellular vesicles (EVs) as a shuttle carrying genetic information between cells has gained a lot of interest in scientific communities. Owing to their higher capabilities in dealing with short sequences of nucleic acid (mRNA, miRNA), proteins, recombinant proteins, exosomes, the most popular form of EVs are viewed as reliable biological therapeutic conveyers. They have natural access through every biological membrane and can be employed for site-specific and efficient drug delivery without eliciting any immune responses hence, qualifying as an ideal delivery vehicle. Also, there are many research studies conducted in the last few decades on using exosome-mediated gene therapy into developing an effective therapy with the concept of a higher degree of precision in gene isolation, purification and delivery mechanism loading, delivery and targeting protocols. This review discusses several facets that contribute towards developing an efficient therapeutic regime for gene therapy, highlighting limitations and drawbacks associated with current GT and suggested therapeutic regimes.


Author(s):  
Kamal Dua ◽  
Mary Bebawy ◽  
Rajendra Awasthi ◽  
Rakesh K. Tekade ◽  
Muktika Tekade ◽  
...  

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1482
Author(s):  
Olga Cañadas ◽  
Andrea García-García ◽  
M. Auxiliadora Prieto ◽  
Jesús Pérez-Gil

Polyhydroxyalkanoates (PHA) are polyesters produced intracellularly by many bacterial species as energy storage materials, which are used in biomedical applications, including drug delivery systems, due to their biocompatibility and biodegradability. In this study, we evaluated the potential application of this nanomaterial as a basis of inhaled drug delivery systems. To that end, we assessed the possible interaction between PHA nanoparticles (NPs) and pulmonary surfactant using dynamic light scattering, Langmuir balances, and epifluorescence microscopy. Our results demonstrate that NPs deposited onto preformed monolayers of DPPC or DPPC/POPG bind these surfactant lipids. This interaction facilitated the translocation of the nanomaterial towards the aqueous subphase, with the subsequent loss of lipid from the interface. NPs that remained at the interface associated with liquid expanded (LE)/tilted condensed (TC) phase boundaries, decreasing the size of condensed domains and promoting the intermixing of TC and LE phases at submicroscopic scale. This provided the stability necessary for attaining high surface pressures upon compression, countering the destabilization induced by lipid loss. These effects were observed only for high NP loads, suggesting a limit for the use of these NPs in pulmonary drug delivery.


2021 ◽  
Vol 26 (5) ◽  
pp. 509-521
Author(s):  
Tamara Athamneh ◽  
Adil Amin ◽  
Edit Benke ◽  
Rita Ambrus ◽  
Pavel Gurikov ◽  
...  

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