scholarly journals Fluorescent Labeling of Hyaluronic Acid-Chitosan Nanocarriers by Protein-Stabilized Gold Nanoclusters

Crystals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1113
Author(s):  
Árpád Turcsányi ◽  
Ditta Ungor ◽  
Edit Csapó
Keyword(s):  
Hyaluronic Acid ◽  
Drug Carrier ◽  
Fluorescent Microscopy ◽  
Gold Nanoclusters ◽  
Fluorescent Labeling ◽  
Colloid Stability ◽  
Wide Range ◽  
Mass Ratios ◽  
Important Field

In medical research the visualization of drug carrier accumulation and release of the loaded drugs in vivo is an important field. In this work, two protein-stabilized gold nanoclusters (Au NCs) as effective fluorescent reporters (FRs) were investigated for labeling of biocompatible chitosan-modified hyaluronic acid based nanocarriers having two different structures. The colloid stability of the labeled carriers was studied by dynamic light scattering and Zeta potential measurements, while the changes in the fluorescence of the lysozyme- (LYZ) and bovine serum albumin (BSA)-stabilized Au NCs were analyzed by spectrofluorimetry and confocal fluorescent microscopy. We found that the labeling was effective with a wide range of marker:carrier mass ratios, and the fluorescence of the NCs and the colloid stability of the complexes were retained. Labeling during preparation and subsequent labeling were compared, and based on composition (nanocluster:carrier mass ratio) and structure of the complex systems we preferred the latter method, as it left the Au NCs free for further modifications. Considering both marker:carrier mass ratios and emission intensities, the LYZ-stabilized Au NCs proved to be better labels. The core-shell type carrier formulations showed increased fluorescence with LYZ-stabilized NCs, presumably from aggregation induced emission.

scholarly journals Novel Neuroprotective Formulations Based on St. John’s Wort Extract

2014 ◽  
Vol 3 (4) ◽  
pp. 3 ◽  
Author(s):  
Monica Vazzana ◽  
Ana S. Macedo ◽  
Antonello Santini ◽  
Caterina Faggio ◽  
Eliana B. Souto
Keyword(s):  
Bioactive Compounds ◽  
Drug Carrier ◽  
Chemical Characterization ◽  
Lipid Nanoparticles ◽  
Special Focus ◽  
St John’S Wort ◽  
St John's Wort ◽  
Wide Range ◽  
Carrier Systems

<p>St. John’s Wort (SJW) has been intensively studied in the last years with respect to its pharmacological properties and to understand the mechanism of action of its bioactive compounds. In fact, it is currently used for the treatment of several disorders. Nevertheless, only recently nanotechnology has been applied for the delivery of SJW extract in vivo, to enhance its neuroprotective properties. In the present review, the advantages, the chemical characterization and the special biological features of SJW extract are discussed, underlining the potential use of nanotechnology in the development of drug carrier systems based on lipid nanoparticles. A special focus is given to solid lipid nanoparticles (SLN) and to nanostructured lipid carriers (NLC) given their versatility for a wide range of bioactive compounds.</p>

scholarly journals Efficient Synthesis of Glutamate Peptide-Estradiol Conjugate for Imaging Estrogen Receptor-Positive Diseases

2018 ◽  
Vol 2018 ◽  
pp. 1-14
Author(s):  
Ming-Chi Shih ◽  
Sergio Daniel Simon ◽  
Zhiming Jin ◽  
Yuan Gui ◽  
Bohua Xu ◽  
...  
Keyword(s):  
Estrogen Receptor ◽  
Endocrine Therapy ◽  
Drug Carrier ◽  
Cell Uptake ◽  
Tumor Resistance ◽  
Efficient Synthesis ◽  
Average Cell ◽  
Wide Range ◽  
Estrogen Receptor Positive

Molecular imaging of estrogen receptor-positive (ER+) pathway-activated system serves the basis of ER+ disease management such as cancers and endometriosis. ER+ patients have better response to endocrine therapy and survive twice as long as negative ER patients. However, tumor resistance resulting from clinical used aromatase inhibitors and antiestrogens is unpredictable. Radiolabeled ER+ ligand could quantify ER+ tissue uptake which helps to stage and restage of the cancer as well as endometriosis. The differential diagnosis of ER+ lesions by using a labeled ligand helps to select the patients for optimal response to endocrine therapy and to discontinue the treatment when resistance occurs. In addition, radiolabeled ER+ ligand serves as basis for image-guided response follow-up. Glutamate receptors are cell surface receptors which are overexpressed in inflammation and infection. Using glutamate peptide as a drug carrier helps to target intracellular genes via glutamate receptor-mediated process. Reports have shown that polyglutamate is a drug carrier that could alter drug solubility and enhance estrogen receptor-ligand binding pocket. However, polyglutamate was a blend of mixed polymer with a wide range of molecular weight. Thus, the structural confirmation and purity of the conjugates were not optimized. To overcome this problem, the efficient synthesis of glutamate peptide-estradiol (GAP-EDL) conjugate was achieved with high purity. EDL was conjugated site-specific at the first glutamate of GAP. The average cell uptake of 68Ga-GAP-EDL was 5-fold higher than the previous reported synthesis. The efficient synthesis of GAP-EDL has greatly enhanced sensitivity and specificity in cell uptake studies. In vivo PET imaging studies indicated that 68Ga-GAP-EDL could image ER (+) tumors in MCF-7 tumor-bearing mice. Therefore, GAP-EDL makes it possible to image ER-enriched endometriosis and cancer.

Self-assembled hyaluronic acid nanoparticles as a potential drug carrier for cancer therapy: synthesis, characterization, and in vivo biodistribution

2009 ◽  
Vol 19 (24) ◽  
pp. 4102 ◽  
Author(s):  
Ki Young Choi ◽  
Kyung Hyun Min ◽  
Jin Hee Na ◽  
Kuiwon Choi ◽  
Kwangmeyung Kim ◽  
...  
Keyword(s):  
Hyaluronic Acid ◽  
Cancer Therapy ◽  
Drug Carrier ◽  
Potential Drug ◽  
In Vivo Biodistribution ◽  
Self Assembled

scholarly journals Nano-fibre Integrated Microcapsules: A Nano-in-Micro Platform for 3D Cell Culture

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Shalil Khanal ◽  
Shanta R. Bhattarai ◽  
Jagannathan Sankar ◽  
Ramji K. Bhandari ◽  
Jeffrey M. Macdonald ◽  
...  
Keyword(s):  
Cell Culture ◽  
Culture Media ◽  
Fluorescent Microscopy ◽  
Chemical Properties ◽  
Cell Encapsulation ◽  
Liver Carcinoma ◽  
Spontaneous Generation ◽  
Step Method ◽  
Wide Range

Abstract Nano-in-micro (NIM) system is a promising approach to enhance the performance of devices for a wide range of applications in disease treatment and tissue regeneration. In this study, polymeric nanofibre-integrated alginate (PNA) hydrogel microcapsules were designed using NIM technology. Various ratios of cryo-ground poly (lactide-co-glycolide) (PLGA) nanofibres (CPN) were incorporated into PNA hydrogel microcapsule. Electrostatic encapsulation method was used to incorporate living cells into the PNA microcapsules (~500 µm diameter). Human liver carcinoma cells, HepG2, were encapsulated into the microcapsules and their physio-chemical properties were studied. Morphology, stability, and chemical composition of the PNA microcapsules were analysed by light microscopy, fluorescent microscopy, scanning electron microscopy (SEM), Fourier-Transform Infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). The incorporation of CPN caused no significant changes in the morphology, size, and chemical structure of PNA microcapsules in cell culture media. Among four PNA microcapsule products (PNA-0, PNA-10, PNA-30, and PNA-50 with size 489 ± 31 µm, 480 ± 40 µm, 473 ± 51 µm and 464 ± 35 µm, respectively), PNA-10 showed overall suitability for HepG2 growth with high cellular metabolic activity, indicating that the 3D PNA-10 microcapsule could be suitable to maintain better vitality and liver-specific metabolic functions. Overall, this novel design of PNA microcapsule and the one-step method of cell encapsulation can be a versatile 3D NIM system for spontaneous generation of organoids with in vivo like tissue architectures, and the system can be useful for numerous biomedical applications, especially for liver tissue engineering, cell preservation, and drug toxicity study.

In Vivo Studies of the Drug Carrying Magnetic Nanocomposite Spheres via Fluorescent Molecules

2010 ◽  
Author(s):  
H. E. Misak ◽  
R. Asmatulu ◽  
J. S. Gopu ◽  
S. Zheng ◽  
P. Wooley ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Targeted Drug Delivery ◽  
Drug Carrier ◽  
Fluorescent Microscopy ◽  
In Vivo Studies ◽  
Fluorescent Nanoparticles ◽  
In Vivo Test ◽  
Straightforward Method ◽  
Targeted Drug

Nanospheres utilized in targeted drug delivery systems have seen much attention, however it is difficult to detect the nanospheres in an in-vivo test due to their nanoscale in size. This is a crucial step in targeted drug delivery to show the nanosphere being concentrated at the spot of interest. Nanospheres developed by oil in oil (o/o) emulsion technique have the advantage of encapsulating molecules, such as 1,6-Diphenyl-1,3,5-hexatriene (DPH), without damages and chemical alterations. In current study, DPH was encapsulated into a nanosphere as a fluorescing tracer to visualize the nanospheres trafficking in a mouse model of squamous cell carcinoma (SCC). The SCC tumors were established on nude mice. 0.5 ml of a 0.3 mg/ml solution of fluorcescent nanospheres were subcutaneously injected around the tumor. The injections of the drug carrier system were repeated at 2-day intervals till the sacrifice of the tumor-bearing animals on day 10. The tumors were retrieved for frozen and paraffin-embedded histological preparation. Fluorsescent microscopy was used to image the frozen sections, and compared with H&E stained sections. The fluorescence nanoparticles were easily identifiable under fluorescent microscopy, while typical histology images were unable to detect the nanospheres. The data suggest that fluorescent nanoparticles can be used to identify the location or localization of the nanospheres in an in-vivo environment in a simple and straightforward method that aids in characterization of targeted drug delivery.

scholarly journals M Protein and Hyaluronic Acid Capsule Are Essential for In Vivo Selection of covRS Mutations Characteristic of Invasive Serotype M1T1 Group A Streptococcus

mBio ◽  
2010 ◽  
Vol 1 (4) ◽  
Author(s):  
Jason N. Cole ◽  
Morgan A. Pence ◽  
Maren von Köckritz-Blickwede ◽  
Andrew Hollands ◽  
Richard L. Gallo ◽  
...  
Keyword(s):  
Hyaluronic Acid ◽  
Virulence Factors ◽  
Gene Knockout ◽  
Genetic Switch ◽  
Host Defense Peptides ◽  
M1 Protein ◽  
Wide Range ◽  
Group A ◽  
Hyaluronic Acid Capsule

ABSTRACTThe initiation of hyperinvasive disease in group AStreptococcus(GAS) serotype M1T1 occurs by mutation within thecovRStwo-component regulon (namedcovRSforcontrolofvirulenceregulatorysensor kinase), which promotes resistance to neutrophil-mediated killing through the upregulation of bacteriophage-encoded Sda1 DNase. To determine whether other virulence factors contribute to this phase-switching phenomenon, we studied a panel of 10 isogenic GAS serotype M1T1 virulence gene knockout mutants. While loss of several individual virulence factors did not prevent GAScovRSswitchingin vivo, we found that M1 protein and hyaluronic acid capsule are indispensable for the switching phenotype, a phenomenon previously attributed uniquely to the Sda1 DNase. We demonstrate that like M1 protein and Sda1, capsule expression enhances survival of GAS serotype M1T1 within neutrophil extracellular traps. Furthermore, capsule shares with M1 protein a role in GAS resistance to human cathelicidin antimicrobial peptide LL-37. We conclude that a quorum of GAS serotype M1T1 virulence genes with cooperative roles in resistance to neutrophil extracellular killing is essential for the switch to a hyperinvasive phenotypein vivo.IMPORTANCEThe pathogen group AStreptococcus(GAS) causes a wide range of human infections ranging from the superficial “strep throat” to potentially life-threatening conditions, such as necrotizing fasciitis, also known as “flesh-eating disease.” A marked increase in the number of cases of severe invasive GAS infection during the last 30 years has been traced to the emergence and spread of a single clone of the M1T1 serotype. Recent studies have shown that GAS serotype M1T1 bacteria undergo a genetic “switch”in vivoto a hypervirulent state that allows dissemination into the bloodstream. The present study was undertaken to identify specific GAS serotype M1T1 virulence factors required for this switch to hypervirulence. The surface-anchored GAS M1 protein and hyaluronic acid capsule are found to be essential for the switching phenotype, and a novel role for capsule in GAS resistance to host defense peptides and neutrophil extracellular killing is revealed.

scholarly journals A REVIEW ON LIQUID CRYSTALLINE NANOPARTICLES (CUBOSOMES): EMERGING NANOPARTICULATE DRUG CARRIER

2020 ◽  
pp. 5-9 ◽  
Author(s):  
S. NAVEENTAJ ◽  
Y. INDIRA MUZIB
Keyword(s):  
Drug Delivery ◽  
Liquid Crystalline ◽  
Low Cost ◽  
Drug Carrier ◽  
Water System ◽  
Cubic Phase ◽  
Simple Method ◽  
Wide Range ◽  
Spherical Structures

Cubosomes are novel biocompatible drug delivery system and have honeycombed (cavernous) structures whose diameter size range from 10–500 nm. They appear like dots, which are likely to be spherical structures. Each dot corresponds to the presence of a pore containing aqueous cubic phase in the lipid water system. Cubosomes posse’s great significance in the field of cosmeceuticals and Pharmaceuticals due to its unique features and become an attractive choice of vehicle for in vivo drug delivery due to their low cost, safety, efficacy and versatility for controlled release application and functionalization. Cubosomes have a very simple method of preparation; biodegradability of selected lipids has the capability to encapsulate hydrophobic and hydrophilic substances. Cubosomes are considered to be versatile systems, and prepared cubosomes can be administrated by different ways such as oral, percutaneous and parenteral routes. On the whole, cubosomes offer high consequence in nano-based drug preparations for melanoma (skin cancer) treatment, targeted drug delivery systems and comprise a wide range of applications in many areas and are characterized by various parameters. Consequently, cubosomes are in progress forward of awareness in the Pharmaceutical division. This review article mainly focuses on the methods of preparation, advantages, and applications of cubosomes.

Evaluation of 99mTc-Label led Vitamin K4 as an Agent for Testicular Imaging

1991 ◽  
Vol 30 (01) ◽  
pp. 35-39 ◽  
Author(s):  
H. S. Durak ◽  
M. Kitapgi ◽  
B. E. Caner ◽  
R. Senekowitsch ◽  
M. T. Ercan
Keyword(s):  
Soft Tissue ◽  
Room Temperature ◽  
Normal Subjects ◽  
Left Testis ◽  
Wide Range ◽  
Activity Ratios ◽  
The Right ◽  
Radioactivity Levels

Vitamin K4 was labelled with 99mTc with an efficiency higher than 97%. The compound was stable up to 24 h at room temperature, and its biodistribution in NMRI mice indicated its in vivo stability. Blood radioactivity levels were high over a wide range. 10% of the injected activity remained in blood after 24 h. Excretion was mostly via kidneys. Only the liver and kidneys concentrated appreciable amounts of radioactivity. Testis/soft tissue ratios were 1.4 and 1.57 at 6 and 24 h, respectively. Testis/blood ratios were lower than 1. In vitro studies with mouse blood indicated that 33.9 ±9.6% of the radioactivity was associated with RBCs; it was washed out almost completely with saline. Protein binding was 28.7 ±6.3% as determined by TCA precipitation. Blood clearance of 99mTc-l<4 in normal subjects showed a slow decrease of radioactivity, reaching a plateau after 16 h at 20% of the injected activity. In scintigraphic images in men the testes could be well visualized. The right/left testis ratio was 1.08 ±0.13. Testis/soft tissue and testis/blood activity ratios were highest at 3 h. These ratios were higher than those obtained with pertechnetate at 20 min post injection.99mTc-l<4 appears to be a promising radiopharmaceutical for the scintigraphic visualization of testes.

Ethnomedicinal uses, Phytochemistry and Pharmacological Aspects of the Genus Berberis Linn: A Comprehensive Review

2020 ◽  
Vol 23 ◽  
Author(s):  
Roohi Mohi-ud-din ◽  
Reyaz Hassan Mir ◽  
Prince Ahad Mir ◽  
Saeema Farooq ◽  
Syed Naiem Raza ◽  
...  
Keyword(s):  
Chemical Constituents ◽  
Pharmacological Activities ◽  
Traditional Use ◽  
Comprehensive Review ◽  
Wide Range ◽  
Anti Cancer ◽  
Comprehensive Survey ◽  
Ethnomedicinal Uses

Background: Genus Berberis (family Berberidaceae), which contains about 650 species and 17 genera worldwide, has been used in folklore and various traditional medicine systems. Berberis Linn. is the most established group among genera with around 450-500 species across the world. This comprehensive review will not only help researchers for further evaluation but also provide substantial information for future exploitation of species to develop novel herbal formulations. Objective: The present review is focussed to summarize and collect the updated review of information of Genus Berberis species reported to date regarding their ethnomedicinal information, chemical constituents, traditional/folklore use, and reported pharmacological activities on more than 40 species of Berberis. Conclusion: A comprehensive survey of the literature reveals that various species of the genus possess various phytoconstituents mainly alkaloids, flavonoid based compounds isolated from different parts of a plant with a wide range of pharmacological activities. So far, many pharmacological activities like anti-cancer, anti-hyperlipidemic, hepatoprotective, immunomodulatory, anti-inflammatory both in vitro & in vivo and clinical study of different extracts/isolated compounds of different species of Berberis have been reported, proving their importance as a medicinal plant and claiming their traditional use.

Current Status and Future Perspective for Research on Medicinal Plants with Anticancerous Activity and Minimum Cytotoxic Value

2019 ◽  
Vol 20 (12) ◽  
pp. 1227-1243
Author(s):  
Hina Qamar ◽  
Sumbul Rehman ◽  
D.K. Chauhan
Keyword(s):  
Side Effects ◽  
Medicinal Plants ◽  
Anticancer Agents ◽  
Drug Targets ◽  
Psidium Guajava ◽  
Current Status ◽  
Future Perspective ◽  
Wide Range

Cancer is the second leading cause of morbidity and mortality worldwide. Although chemotherapy and radiotherapy enhance the survival rate of cancerous patients but they have several acute toxic effects. Therefore, there is a need to search for new anticancer agents having better efficacy and lesser side effects. In this regard, herbal treatment is found to be a safe method for treating and preventing cancer. Here, an attempt has been made to screen some less explored medicinal plants like Ammania baccifera, Asclepias curassavica, Azadarichta indica, Butea monosperma, Croton tiglium, Hedera nepalensis, Jatropha curcas, Momordica charantia, Moringa oleifera, Psidium guajava, etc. having potent anticancer activity with minimum cytotoxic value (IC50 >3μM) and lesser or negligible toxicity. They are rich in active phytochemicals with a wide range of drug targets. In this study, these medicinal plants were evaluated for dose-dependent cytotoxicological studies via in vitro MTT assay and in vivo tumor models along with some more plants which are reported to have IC50 value in the range of 0.019-0.528 mg/ml. The findings indicate that these plants inhibit tumor growth by their antiproliferative, pro-apoptotic, anti-metastatic and anti-angiogenic molecular targets. They are widely used because of their easy availability, affordable price and having no or sometimes minimal side effects. This review provides a baseline for the discovery of anticancer drugs from medicinal plants having minimum cytotoxic value with minimal side effects and establishment of their analogues for the welfare of mankind.

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