pH Responsive nano carriers for anti cancer drug delivery

Bagherifam, Shahla
In the recent years, development of various organic and inorganic nano-sized systems has gained great interests especially for cancer diagnosis and treatment and intense researches are carried out in this area. Regarding to the recent trends for drug delivery system design, the novel approaches for drug carriers are mainly based on development of smart and nano-size drug carriers which are targeted to cancer cells. Hence, for an effective tumor-targeted delivery device, besides its chemical structure further criteria such as detection of tumor site and sensitivity to the higher temperature and lower pH of the tumor compare to rest of the body gains importance. The aim of this study is to design and prepare polysebacic anhydride (PSA) based nanocapsules (NCs) loaded with Doxorubicin (DOX) which is an anti cancer drug. In order to obtain an intelligent delivery system, drug-loaded nanocapsules were coated with pH sensitive poly (L-histidine). PSA nano-carriers were firstly loaded with DOX and then in order to introduce pH sensitivity, they were coated with poly (L-histidine). PLH-coated NCs were modified with polyethylene glycol (PEG) to prevent their macrophage uptake. Drug release profile from this system was examined in two different buffer solutions prepared as acidic (pH 4) and physiological (pH 7.4) media. The physical and chemical properties of the nano particles were characterized by Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), ultraviolet and visible absorption spectroscopy (UV-VIS), and scanning electron microscopy (SEM). In vitro studies of the prepared nanocapsules were performed on MDA-MB-231 breast cancer cells by using WST Kit 8 cell viability test. In order to obtained results, pH sensitive nanocapsules with size 230 nm exhibited cellular uptake and promising intracellular release of drug.


Ph duyarlı polisebasik anhidrit bazlı nanokürelerin ilaç taşıyıcı sistem olarak hazırlanması
Fam, Bagheri Shahla; Hasırcı, Nesrin; Hasırcı, Vasıf Nejat(2012)
Son yıllarda, özellikle kanser hastalığında teşhis ve tedavi amaçlı kullanılmak üzere, nano boyutta çeşitli organik ve inorganik sistemlerin geliştirilmesi büyük önem kazanmıştır ve bu konuda yoğun araştırmalar yapılmaktadır. Farmasötik açıdan bakıldığında, ideal bir ilaç taşıyıcı, küçük parçacık boyutunda ve yüksek ilaç yüklenme kapasitesinde olmalı, kanda uzun süre dolaşabilme özelliği göstermeli, biyobozunur olmalı ve bozunduğu kimyasallar olumsuz yan etki göstermeden vü...
Effects of human granulocyte-colony stimulating factor on fracture healing in rats
Bozlar, M; Aslan, B; Kalaci, A; Baktiroglu, L; Yanat, AN; Tasci, A (2005-08-01)
Objective: Granulocyte colony stimulation factor (G-CSF) is generally used to prevent and cure the neutropenia associated with chemotherapy and bone marrow transplantation. In addition to its effects on neutrophil function, G-CSF was found to have the characteristic of modulating the cytokines in the inflammatory response. Then, the question to answer is whether it has any effect on fracture healing and to what extent? In this study, we test the effects of G-CSF on the healing of tibia fracture in a rat model.
Targeting human telomeric DNA with azacyanines
Kucukakdag Dogu, Ayca; Persil Çetinkol, Özgül (2019-01-01)
Small molecules targeting telomeric DNA or its interactions with telomerase have been an active area of cancer research. In the present study, we investigated the interactions of six benzimidazole compounds, called azacyanines, differing from each other in alkyl chain length and branching in the benzimidazole ring (azamethyl, azaethyl, azapropyl, azaisopropyl, azabutyl, and azaisobutyl) with human telomeric DNA (tel24) in 1:1 and 1:6 ratio (tel24:azacyanine) using UV-Vis, circular dichroism (CD), and fluore...
pH-Responsive Nano Carriers for Doxorubicin Delivery
Bagherifam, Shahla; Skjeldal, Frode Miltzow; Griffiths, Gareth; Maelandsmo, Gunhild M.; Engebraten, Olav; Nystrom, Bo; Hasırcı, Vasıf Nejat; Hasırcı, Nesrin (2015-04-01)
Purpose The aim of this study was to design stimuli-responsive nanocarriers for anti-cancer drug delivery. For this purpose, doxorubicin (DOX)-loaded, polysebacic anhydride (PSA) based nanocapsules (NC) were combined with pH-sensitive poly (L-histidine) (PLH).
Label-free detection of telomerase activity using guanine electrochemical oxidation signal
Eskiocak, Ugur; Ozkan-Ariksoysal, Dilsat; Ozsoz, Mehmet; Öktem, Hüseyin Avni (American Chemical Society (ACS), 2007-11-15)
Telomerase is an important biomarker for cancer cells and its activation in 85% of all cancer types confers a clinical diagnostic value. A label-free electrochemical assay based on guanine oxidation signal to measure telomerase activity is described. This developed technology combined with a disposable sensor, carbon graphite electrode (CGE), and differential pulse voltammetry (DPV) was performed by using PCR amplicons with/without telomeric repeats as the guanine oxidation signal observed at +1.0 V measure...
Citation Formats
S. Bagherifam, “pH Responsive nano carriers for anti cancer drug delivery,” Ph.D. - Doctoral Program, Middle East Technical University, 2013.