Role of dendrimers in advanced drug delivery and biomedical applications: a review
Aim: Dendrimers dendritic structural design holds vast promises, predominantly for drug delivery, owing to their unique properties. Dendritic architecture is widespread topology found in nature and offers development of specific properties of chemical substances. Dendrimers are an ideal delivery veh...
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Akbarzadeh, A. Khalilov, R. Mostafavi, E. Annabi, N. Abasi, E. Kafshdooz, T. Herizchi, R. Kavetskyy, T. Saghf, S. Nasibova, A. Davaran, S. 2019-01-24T16:10:03Z 2019-01-24T16:10:03Z 2018 Role of dendrimers in advanced drug delivery and biomedical applications: a review / A. Akbarzadeh, R. Khalilov, E. Mostafavi, N. Annabi, E. Abasi, T. Kafshdooz, R. Herizchi, T. Kavetskyy, S. Saghfi, A. Nasibova, S. Davaran // Experimental Oncology. — 2018 — Т. 40, № 3. — С. 178–183. — Бібліогр.: 91 назв. — англ. 1812-9269 https://nasplib.isofts.kiev.ua/handle/123456789/145596 Aim: Dendrimers dendritic structural design holds vast promises, predominantly for drug delivery, owing to their unique properties. Dendritic architecture is widespread topology found in nature and offers development of specific properties of chemical substances. Dendrimers are an ideal delivery vehicle candidate for open study of the effects of polymer size, charge, and composition on biologically relevant properties such as lipid bilayer interactions, cytotoxicity, bio-distribution, internalization, blood plasma retention time, and filtration. This article reviews role of dendrimers in advanced drug delivery and biomedical applications. Key Words: dendrimers, drug delivery vehicle, lipid bilayer interactions, dendritic architecture. The authors thank the Department of Medical Nanotechnology, Faculty of Advanced Medical Science of Tabriz University, for all support provided. This work is funded by a 2017 grant by the Drug Applied Research Center, Tabriz University of Medical Sciences. en Інститут експериментальної патології, онкології і радіобіології ім. Р.Є. Кавецького НАН України Experimental Oncology Reviews Role of dendrimers in advanced drug delivery and biomedical applications: a review Article published earlier |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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DSpace DC |
| title |
Role of dendrimers in advanced drug delivery and biomedical applications: a review |
| spellingShingle |
Role of dendrimers in advanced drug delivery and biomedical applications: a review Akbarzadeh, A. Khalilov, R. Mostafavi, E. Annabi, N. Abasi, E. Kafshdooz, T. Herizchi, R. Kavetskyy, T. Saghf, S. Nasibova, A. Davaran, S. Reviews |
| title_short |
Role of dendrimers in advanced drug delivery and biomedical applications: a review |
| title_full |
Role of dendrimers in advanced drug delivery and biomedical applications: a review |
| title_fullStr |
Role of dendrimers in advanced drug delivery and biomedical applications: a review |
| title_full_unstemmed |
Role of dendrimers in advanced drug delivery and biomedical applications: a review |
| title_sort |
role of dendrimers in advanced drug delivery and biomedical applications: a review |
| author |
Akbarzadeh, A. Khalilov, R. Mostafavi, E. Annabi, N. Abasi, E. Kafshdooz, T. Herizchi, R. Kavetskyy, T. Saghf, S. Nasibova, A. Davaran, S. |
| author_facet |
Akbarzadeh, A. Khalilov, R. Mostafavi, E. Annabi, N. Abasi, E. Kafshdooz, T. Herizchi, R. Kavetskyy, T. Saghf, S. Nasibova, A. Davaran, S. |
| topic |
Reviews |
| topic_facet |
Reviews |
| publishDate |
2018 |
| language |
English |
| container_title |
Experimental Oncology |
| publisher |
Інститут експериментальної патології, онкології і радіобіології ім. Р.Є. Кавецького НАН України |
| format |
Article |
| description |
Aim: Dendrimers dendritic structural design holds vast promises, predominantly for drug delivery, owing to their unique properties. Dendritic architecture is widespread topology found in nature and offers development of specific properties of chemical substances. Dendrimers are an ideal delivery vehicle candidate for open study of the effects of polymer size, charge, and composition on biologically relevant properties such as lipid bilayer interactions, cytotoxicity, bio-distribution, internalization, blood plasma retention time, and filtration. This article reviews role of dendrimers in advanced drug delivery and biomedical applications. Key Words: dendrimers, drug delivery vehicle, lipid bilayer interactions, dendritic architecture.
|
| issn |
1812-9269 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/145596 |
| citation_txt |
Role of dendrimers in advanced drug delivery and biomedical applications: a review / A. Akbarzadeh, R. Khalilov, E. Mostafavi, N. Annabi, E. Abasi, T. Kafshdooz, R. Herizchi, T. Kavetskyy, S. Saghfi, A. Nasibova, S. Davaran // Experimental Oncology. — 2018 — Т. 40, № 3. — С. 178–183. — Бібліогр.: 91 назв. — англ. |
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178 Experimental Oncology 40, 178–183, 2018 (September)
ROLE OF DENDRIMERS IN ADVANCED DRUG DELIVERY
AND BIOMEDICAL APPLICATIONS: A REVIEW
A. Akbarzadeh1–4, R. Khalilov2, 5, 6, *, E. Mostafavi7, N. Annabi2, 4, E. Abasi8, 9, T. Kafshdooz10,
R. Herizchi11, T. Kavetskyy2, 12, 13, *, S. Saghfi2, 6, A. Nasibova2, 5, S. Davaran2, 10, 14
1Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz 5154853431, Iran
2Joint Ukraine-Azerbaijan International Research and Education Center of Nanobiotechnology
and Functional Nanosystems, Drohobych 82100, Ukraine & Baku AZ 1143, Azerbaijan
3Universal Scientific Education and Research Network (USERN), Tabriz 5154853431, Iran
4Department of Chemical and Biomolecular Engineering in the Henry Samueli School of Engineering
and Applied Science at University of California, Los Angeles (UCLA), California, USA
5Institute of Radiation Problems, National Academy of Sciences of Azerbaijan, Baku AZ 1143, Azerbaijan
6Department of Biophysics and Molecular Biology, Faculty of Biology,
Baku State University, Baku AZ 1143, Azerbaijan
7Department of Chemical Engineering, Northeastern University, Boston, USA
8Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz 5154853431, Iran
9Student Research Committee, Tabriz University of Medical Sciences, Tabriz 5154853431, Iran
10Biotechnology Research Center, Tabriz University of Medical Sciences, Tabriz 5154853431, Iran
11Hematology and Oncology Research Center, Tabriz University of Medical Sciences,
Tabriz 5154853431, Iran
12Department of Biology and Chemistry, Faculty of Biology and Natural Sciences, Drohobych Ivan Franko
State Pedagogical University, Drohobych 82100, Ukraine
13Department of Applied Physics, The John Paul II Catholic University of Lublin, Lublin 20-950, Poland
14Department of Medical Nanotechnology, Faculty of Advanced Medical Sciences,
Tabriz University of Medical Sciences, Tabriz 5154853431, Iran
Aim: Dendrimers dendritic structural design holds vast promises, predominantly for drug delivery, owing to their unique properties.
Dendritic architecture is widespread topology found in nature and offers development of specific properties of chemical substances.
Dendrimers are an ideal delivery vehicle candidate for open study of the effects of polymer size, charge, and composition on biologi-
cally relevant properties such as lipid bilayer interactions, cytotoxicity, bio-distribution, internalization, blood plasma retention
time, and filtration. This article reviews role of dendrimers in advanced drug delivery and biomedical applications.
Key Words: dendrimers, drug delivery vehicle, lipid bilayer interactions, dendritic architecture.
Dendrimers are exceedingly branched, globular
macromolecules with many arms emanating from
a central core [1, 2]. The atomistic feature of den-
drimer structure has lagged behind this fast prog-
ress in synthesis and design [3]. To date, more than
fifty families of dendrimers exist, possessing unique
properties, since the surface, interior and core can
be tailored to diverse types of applications [4].The
derivatization of low molecular weight and protein-
based therapeutics with polymers has been shown
to advance their pharmacokinetic and pharmaco-
dynamic pro perties [5, 6]. One of the most talented
applications of nanotechnology is in the field of medi-
cine. Certainly, a whole novel field of “nanomedicine”
is promising [7]. Nanomedicine plays a vital role
to advance drug delivery, cancer treatment, and
so on. Dendrimers are nano-sized, radially symmet-
ric molecules with fine-defined, homogeneous and
monodisperse composition consisting of tree-like
arms or embranchment [8, 9]. Dendrimers are iden-
tified by unique properties like globular shape, well
defined three dimensional structure, cavities, high
functionality and small size. These properties make
them unique for using in nanotechnology and diverse
biomedical applications [10–12]. Dendrimer struc-
tures are formed with a fundamental atom or group
of atoms tagged as the core. From this central struc-
ture, branches of other atoms called “dendrons” raise
through diverse chemical reactions [8].
Dendrimers show considerably enhanced physical and
chemical properties compared to traditional linear poly-
mers. A number of significant properties of dendrimers
are: (1) monodispersity; (2) nano-size and shape; (3)
biocompatibility; (4) periphery charge; (5) dendrimer-
membrane interaction; and (6) pharmacokinetics [13–17].
Exp Oncol 2018
40, 3, 178–183
REVIEW
Submitted: March 15, 2018
*Correspondence: E-mail: hrovshan@hotmail.com;
kavetskyy@yahoo.com
Abbreviations used: DTPA — diethylenetriamine pentaacetic acid;
MRI — magnetic resonance imaging; NSAIDs — nonsteroidal anti-
inflammatory drugs; PAMAM — polyamidoamine; PDT — photody-
namic therapy; PEG — polyethylene glycol; RNAi — RNA interfe-
rence; siRNA — small interfering RNAs.
Experimental Oncology 40, 178–183, 2018 (September)40, 178–183, 2018 (September) (September) 179
TYPES OF DENDRIMERS
A quick growth of dendritic new carrier has been
probable because of recent advances in synthetic
chemistry and characterization methods. Also a variety
of dendritic scaffolds has become accessible with de-
fined nanoscopic size and plenty numbers of functional
end groups [18].
Nowadays there are more than fifty families
of dendrimers each with unique properties that are
undergoing investigation for use in a diversity of dif-
ferent biomedical applications [19]. Dendritic poly-
mers are similar to proteins, enzymes, and viruses,
and are simply functionalized. Dendrimers and other
molecules can either be linked to the rim or can be en-
capsulated in their internal holes. Current medicine
uses a diversity of this material as potential blood
substitutes, for example polyamidoamine (PAMAM)
dendrimers [20]. For instance, phosphorus-containing
dendrimers have demonstrated antiprion activity and
can potentially be used as inductors for gene therapy
Boronated starburst PAMAM dendrimer-monoclonal.
Antibody immune compounds as potentially effective
anticancer reagent containing boron neutron capture
were used [21, 22].
APPLICATIONS
Multifunctional end groups and occurrence of vari-
ous internal cavities cause to be dendrimers appropri-
ate for possible pharmaceutical uses counting a variety
of therapeutic and biomedical applications [23–25].
Dendrimers and various routes of drug deli
very. Nano scale materials have unique properties,
such as structural uniformity, efficient membrane
transport, high purity, high drug pay load, good col-
loidal, targeting potential, and shelf stability. Because
of these unique features, dendrimers are one of the
talented technologies of recent times and have served
as an exceptional platform to reach the development
as new drug delivery scaffolds; for instance, PAMAM
dendrimers have carried the antitumor drug metho-
trexate and fluorescein for tracking [26–28]. The best
dendrimer must have a low molecular weight to be ef-
fortlessly filtered by the kidneys [29]. Due to the unique
characteristics of dendrimers, such as well-defined
size, shape, molecular weight and monodispersity,
these molecules have wide applications in drug de-
livery [30, 31]. Drug molecules can be physically
trapped inside the dendrimers or be adsorbed on the
dendrimer surfaces using electrostatic interaction,
hydrogen bonding, or van der Waals force. Drug mole-
cules can also be covalently attached on the dendrimer
surfaces to provide dendrimer-drug conjugates [32].
Oral drug delivery. Among the various routes
of drug delivery, the oral route is may be the one mostly
favored by patients and clinicians. For several available
and novel drugs for example peptidomimetics, thera-
peutic peptides, oligonucleotides and other cases,
oral bioavailability is in the most of cases below pass-
able levels. To control this problem and to guaranty
an adequate high oral absorption, the use of effective
oral drug delivery systems is significant [33]. An ef-
fective oral macromolecular drug carrier should have
the capability to prevent the drugs from degrading.
They might decrease non-specific interactions with
food proteins and let increased absorption through
the intestinal epithelium. The potential use of PAMAM
dendrimers as oral drug delivery carriers have been
demonstrated by several studies [34–44]. In a study
that was done by Kitchens et al. [45] it was demon-
strated that transepithelial transport and microvascular
extravasation of PAMAM dendrimers are dependent
upon their structural properties such as molecular
geometry, molecular size, and surface chemistry.
These consequences indicate that by optimizing fac-
tors such as the size and surface charge of PAMAM
dendrimers, it is possible to expand oral drug delivery
systems based on these carriers.
Ocular drug delivery. Dendrimers have attracted
remarkable attention as ocular drug delivery systems,
because of their tailorable structure, well-defined size
and potentially favorable ocular biodistribution [46].
Surface-modified PAMAM dendrimers with carbo xylic
or hydroxyl surface groups, have been reported in in-
creasing residence time and improving bioavailability
of pilocarpine in the eye [47]. Conjugating of den-
drimers with polyethylene glycol (PEG), create hydro-
gels that have applications including cartilage tissue
production and for sealing ophthalmic injuries [48,
49]. Consequently, the improvement of ocular drug
delivery by dendrimers may be a promising method
for clinical applications.
Transdermal drug delivery. Drug delivery via
the skin to get a systemic effect of drug is generally
known as transdermal drug delivery [50]. The per-
meability of dendrimers via the skin is determined
by physicochemical parameters such as surface
charge, molecular weight, generation size, compo-
sition and concentration [51, 52]. Dendrimers have
been demonstrated to be effective as transdermal
drug delivery systems for nonsteroidal anti-inflam-
matory drugs (NSAIDs), antimicrobial, antiviral, an-
ticancer or antihypertensive drugs. Yiyun et al. [53]
and other researchers have shown that PAMAM
dendrimers can considerably increase transdermal
delivery of diflunisal and ketoprofen, two model
NSAIDs [53, 54]. Encapsulation of cisplatin, a plati-
num based anticancer drug into PAMAM dendrimers
gave conjugates that presented higher accumulation
in solid tumors, slower release, and lower toxicity
compared to drug [55, 56].
Targeted drug delivery. Targeted drug deli-
very is a technique of delivering a therapeutic agent
to a specific cell type or tissue in a site-specific man-
ner. Dendrimers have been studied as one kind of ve-
hicle for application in targeted drug delivery [1, 2, 57,
58]. Targeted delivery of chemotherapeutics to tumor
cells decreased side effects compared to systemic
delivery [49]. Patri et al. [57] reported the synthesis
of generation 5 PAMAM dendrimer conjugated with
folic acid for the targeted delivery of methotrexate.
180 Experimental Oncology 40, 178–183, 2018 (September)
Magnetic resonance imaging (MRI). Recently
the use of dendrimers as a new class of macromo-
lecular MRI contrast agents has been explored.
The most generally used MRI contrast agents are
gadolinium-based contrast agents [59, 60]. The
covalent attachment of Gd(III) complexes to PAMAM
dendrimers to generate unique macromolecular con-
trast agents for MRI have been reported by several
research groups. Kojima et al. [61] have prepared
fully PEGylated PAMAM dendrimers loaded with
Gd-diethylenetriamine pentaacetic acid (DTPA). For
conjugation of Gd-DTPA to the side chain, Lysine
(Lys) was attached before the PEG modification [62].
Their results showed that PEGylation of a Gd-labeled
PAMAM dendrimer decrease the relaxivity and plasma
clearance, and variations susceptibility to temperature.
Even though PEGylation decreases relaxivity by re-
ducing access to water, by using a bigger dendrimer
(G5 vs G4) this effect can be improved with intrinsic
higher relaxivities because of slower molecular tum-
bling rates. The calculation of PEG to a dendrimer
increased retention in the vascular pool, a feature
that could be useful for vascular imaging in cancer,
atherosclerosis, and inflammatory disorders, as well
as for improving drug delivery [61].
Photodynamic therapy (PDT). PDT is a talented
approach to treat certain kinds of cancer. PDT was
planned as a helpful oncology tool more than 30 years
ago, but it has restrictions. The success of PDT de-
pends mostly on photosensitizers and improvement
of an effective second generation is continuing. PDT
is a hopeful treatment methodology whereby diseased
cells and tissues are destroyed by reactive oxygen
species by using a combination of light and photosen-
sitizers. Dendrimers possess architecture appropriate
for incorporating particular functional moieties and
are a hopeful venue for further researches [63, 64].
Delivery of bioactive. The core and the interior
branches of a dendrimer can be synthetic or based
on natural peptide or saccharide structures. When
adorned with peptide or carbohydrate ligands
throughout surface functional groups, dendrimers are
endowed with the bioactivity to mediate the interac-
tion with cell surface receptors. Bioactive dendrimers
can attach with particular receptors on cell mem-
brane [65–70]. When linking peptides or carbohy-
drates, the general ligation strategies can be applied
directly to generating bioactive dendrimer conjugates.
However, there are at least two factors characteristi-
cally related with the ligation of dendrimer scaffolds:
one of them is the type and generation of dendrimer
trellis that would ascertain the shape and size of final
products and another one is the number of peripheral
branches and modification level that could affect the
multivalent spatial arrangement and receptor binding
properties of bioactive ligands [71].
Dendrimers in gene delivery. Dendrimers can
be used as a transporter in gene therapy. For instance,
PAMAM dendrimers have terminal amino groups
which interact with phosphate group of nucleic acid.
As a result PAMAM dendrimers have been tested
as a genetic material vector [72]. Dendrimers were
discovered in 1970 by Tomalia and co-workers [1]. The
first article using the term “dendrimer” and describing
in detail the preparation of poly(PAMAM) dendrimers
was presented in 1984. They are polymeric symmet-
ric monodisperse complexes that comprise of well-
defined branches around a small molecule, called
core. Dendrimers of lower generations (0, 1, and 2)
have highly asymmetric shape and have more open
structures as compared to higher generation [73–75].
Dendrimers become densely packed as they extend
out to the periphery, which forms a closed membrane-
like structure [76]. Dendritic copolymers are a specific
group of dendrimers, two different types of copolymers
were recognized: Segment-block dendrimers are ob-
tained by attaching different wedges to one polyfunc-
tional core molecule. Layer-block dendrimers consist
of concentric spheres of differing chemistry [76].
DNA molecules are well suited for these purposes
because of their unique molecular detection fea-
tures. Linear DNA chains can assemble into a range
of non-linear structures: branching of the double helix
is induced by breaking the run of the complementarity
of the part strands. Dendrimers with arms terminat-
ing in oligonucleotides of the same or of different
sequences could be used to build cages, cryptands,
tubes, nets, scaffolds and other more complex three-
dimensional (3-D) structures [76–80]. An important
characteristic of nucleic acids is the sharp melting
transition of the base-paired double strand. It is im-
portant to know how dendrimerisation affects this
behavior in order to understand how branched nucleic
acids may be used as molecular building blocks [81].
Recognition features ability to deliver pieces
of DNA to the required parts of a cell includes many
challenges. To maintain the activity of DNA during
dehydration, the dendrimer/DNA complexes were
encapsulated in a water-soluble polymer, and then
deposited on or sandwiched in functional polymer
films with a fast degradation rate to mediate gene
transfection. Based on this method, PAMAM den-
drimer/DNA complexes were used to encapsulate
functional biodegradable polymer films for substrate
mediated gene delivery. Research has shown that the
fast degrading functional polymer has great potential
for localized transfection [82, 83]. Apart from small
drug particles dendrimers are thoroughly examined
for the delivery of DNA. PAMAM dendrimers, and
polycationic molecules can form complexes with DNA
through sequence-independent electrostatic interac-
tion between anionic phosphate groups of nucleic acid
and cationic primary amino surface groups. These
opposite charges neutralize; therefore, the net charge
modifications result in changes of physicochemical
and biological properties. The nature of “dendriplexes”
are affected not only by concentration of the DNA
phosphate groups and dendrimers surface amino
groups, also by the shape of dendritic polymers and
Experimental Oncology 40, 178–183, 2018 (September)40, 178–183, 2018 (September) (September) 181
solvent’s properties such as pH, salt concentration,
buffer strength and the dynamics of mixing [84–87].
Targeted delivery of dicersubstrate siRNAs.
Small interfering RNAs (siRNA) are talented as new
therapeutic agents, given that convenient delivery
systems that are available. Dendrimers, a particular
group of synthetic macromolecules, demonstrate
an exciting delivery platform by virtue of their well-
defined dendritic structure and unique multivalency
and cooperativity limited within a nanosized volume.
Significant interest has been considered to capita-
lize on dendrimer nanocarriers for the delivery of the
emerging RNA interfe rence (RNAi) based nucleic
acid drugs [88, 89]. The delivery of RNAi therapeutics
should be not only efficient but also targeted in the
right site in order to achieve higher efficacy and less
toxicity.
Cancer therapy. During the past few years there
has been considerable advancement in the application
of biocompatible dendrimers for cancer treatment,
including their use as drug delivery systems for che-
motherapeutic agents such as cisplatin and doxoru-
bicin [90]. The necessity for using of biodegradable
dendrimers appeared as a strategy to generate the
desired large molecular weight carriers which lead
to high retention and accumulation in tumor tissue,
while permitting rapid and safe omission of dendrimer
fragments into the urine to prevent nonspecific toxic-
ity [91]. Lee et al. [92] synthesized biodegradable
cationic G3 dendrons and G2 dendrimers by the
convergent synthetic method and introduced them
as candidates for biomedical applications. Because
of excellent properties of PEGylated dendrimers,
such as tunable pharmacokinetics and ability to carry
multiple copies of bioactive molecules, these materials
are attractive for many biological applications. The fast
and efficient synthesis of a robust and biodegradable
PEGylated dendrimer based on a polyester-polyamide
hybrid core is demonstrate by Frechet, Szoka and co-
workers [93].
CONCLUSION
Role of dendrimers in advanced drug delivery
and biomedical applications is briefly reviewed.
Dendrimers are known as extremely defined artificial
macromolecules, which are characterized by a com-
bination of a high number of functional groups and
a condensed molecular structure. Pharmacokinetic
property is one of the most important aspects in the
successful applications of dendrimers, for example,
imaging, drug delivery, PDT, etc. The variety of po-
tential applications of dendrimers in medicine results
in increasing attention in this area.
ACKNOWLEDGMENTS
The authors thank the Department of Medical
Nanotechnology, Faculty of Advanced Medical Sci-
ence of Tabriz University, for all support provided. This
work is funded by a 2017 grant by the Drug Applied Re-
search Center, Tabriz University of Medical Sciences.
CONFLICT OF INTEREST
The authors report no conflict of interest. The
authors alone are responsible for the content and
writing of the paper.
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