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Autologous and synthetic bone grafts showed some limitations during their usage in bone tissue regeneration. This is attributed to several drawbacks such as difficulty of finding a donor in addition to the autoimmune rejection. This study aims to fabricate a well-designed biocompatible double-layered structure of highly porous poly(lactic acid)-based electrospun nanofibers (NFs) as scaffolds for bone tissue regeneration. Poly(lactic acid) was chosen to fabricate the main matrix of the NFs scaffold as it is one of the FDA approved and highly recommended biopolymers for biomedical applications owing to its high biodegradability and biocompatibility Each layer is loaded with a different drug (Phenytoin and Sildenafil) to stimulate bone healing process. The solvents and the parameters of electrospinning were manipulated to produce highly porous structures in order to enhance the in-situ biodegradability of the NFs mats as well as the drug release rate. The produced NFs mats were fully characterized morphologically (SEM), chemically (FTIR), physically (DSC) and physicochemically (biodegradability, swellability, porosity and water vapor permeability) as well as studying the drug release profiles of both drugs. Cytotoxicity of the fabricated NFs was tested using fibroblast cells to detect their biocompatibility. Cell adhesion and proliferation were examined using SEM before using the NFs as scaffolds in mice animal model. The efficiency of the developed NFs scaffolds in healing bone fractures was assessed after 14 and 28 days through visual inspection, SEM investigation and bone mineral density assessment. Finally, sections from the bone fracture sites were isolated for histopathological examination. The study revealed the efficiency of the drugs-loaded NFs in enhancing cell adherence, cell proliferation, angiogenesis formation and finally tissue restoration of bone fractures.
This article was published in the following journal.
Name: International journal of biological macromolecules
Effect of the configuration of poly(lactic acid) and content of poly(oxyethylene) blocks to the structure and functional properties of poly(lactic acid)-block-poly(oxirane)-based nanofibrous electrospun polyester-ether-urethanes used as potential drug-delivery system.
Poly(lactic acid)-block-poly(oxirane)s (PLA-b-POE) of various compositions were prepared using a one-pot approach and then extended in a reaction with l-lysine diethyl ester diisocyanate, thereby form...
To assess the wound-healing ability of poly(lactic-co-glycolic acid) (PLGA) nanofibrous wound dressing incorporated with andrographolide (Andro)-loaded mesoporous silica nanoparticles (MSNs).
Tacrolimus-loaded methoxy poly(ethylene glycol)-block-poly(D,L)-lactic-co-glycolic acid micelles self-assembled in aqueous solution for treating cornea immune rejection after allogenic penetrating keratoplasty in rats.
This study aimed to develop a stable and biodegradable tacrolimus loaded nanocarrier that enhanced tacrolimus corneal penetration and delivered in a sustained manner, thus to create a promising treatm...
Poly-L-lactic acid (PLLA) is a biodegradable synthetic polyester synthesized by polymerization or polycondensation. PLLA hydrolytically degrades into lactic acid, a biocompatible metabolic by-product,...
CZ48, a prodrug of camptothecin (CPT) with derivative resistant to lactone hydrolysis, suffers from limited application for cancer treatment due to poor water-solubility, thus causing its low bioavail...
Primary: Evaluate the degree of correction attainable with Poly-L-Lactic Acid(Sculptra) for the correction of hill and valley acne scarring Secondary: Document types and inc...
This is a multi-centre, open-label, 96 week study to evaluate the safety, tolerability and extent and duration of improvement in HIV-1 infected subjects with antiretroviral induced facial ...
This is a phase IV prospective, multicentre, single cohort, open-label clinical trial evaluating the efficacy and safety of Poly-L-lactic acid (Sculptra® Aesthetic) for the treatment of c...
This study will evaluates the emotional and functional benefits of Poly-L-Lactic Acid (Sculptra™), a cosmetic product used to fill defects of the skin. All participants will receive Scul...
All subjects will receive three, single-sided injections of PLLA, performed 1 month apart.
A species of gram-positive, rod-shaped LACTIC ACID bacteria that is frequently used as starter culture in SILAGE fermentation, sourdough, and lactic-acid-fermented types of beer and wine.
A poly(A) binding protein that is involved in promoting the extension of the poly A tails of MRNA. The protein requires a minimum of ten ADENOSINE nucleotides in order for binding to mRNA. Once bound it works in conjunction with CLEAVAGE AND POLYADENYLATION SPECIFICITY FACTOR to stimulate the rate of poly A synthesis by POLY A POLYMERASE. Once poly-A tails reach around 250 nucleotides in length poly(A) binding protein II no longer stimulates POLYADENYLATION. Mutations within a GCG repeat region in the gene for poly(A) binding protein II have been shown to cause the disease MUSCULAR DYSTROPHY, OCULOPHARYNGEAL.
Acidosis caused by accumulation of lactic acid more rapidly than it can be metabolized. It may occur spontaneously or in association with diseases such as diabetes mellitus, leukemia, or liver failure.
The addition of a tail of polyadenylic acid (POLY A) to the 3' end of mRNA (RNA, MESSENGER). Polyadenylation involves recognizing the processing site signal, (AAUAAA), and cleaving of the mRNA to create a 3' OH terminal end to which poly A polymerase (POLYNUCLEOTIDE ADENYLYLTRANSFERASE) adds 60-200 adenylate residues. The 3' end processing of some messenger RNAs, such as histone mRNA, is carried out by a different process that does not include the addition of poly A as described here.
A family of proteins involved in the transport of monocarboxylic acids such as LACTIC ACID and PYRUVIC ACID across cellular membranes.
Osteoporosis is a disease in which the bones become extremely porous, are subject to fracture, and heal slowly, occurring especially in women following menopause and often leading to curvature of the spine from vertebral collapse. Follow and track&n...
Autoimmune disorders are conditions that occurs when the immune system mistakenly attacks and destroys healthy body tissue. There are more than 80 different types of autoimmune disorders. Normally the immune system's white blood cells help protect ...
In order to become availible to pateints, drugs need to undergo a number of phases of clinical trials to test their efficacy and safty and to then be authorised by the drug approval organistion in each respective country. This is the FDA in the USA and N...