فهرست مطالب شهرام تیموریان

Three-dimensional nano scaffolds by creating a three-dimensional structure similar to the body tissues have created a new perspective on cell culture and tissue repair. The aim of this study was to investigate the effect of polycaprolactone biodegradation scaffold (PCL) in treatment of diabetic wounds. Nano PCL-Gelatine scaffold was synthesized by electrospun method. A circular wound (6 mm) was created in skin of 15 BALB/c rats and the rats were divided into 3 groups including: Non-diabetic group (sham), Diabetic group without nano scaffold receiving (control) and diabetic group with nano scaffolds (scaffold). Wound surface area and wound healing were evaluated on the 7th and 14th days using H & E staining with Image J and SPSS softwares. On 7th day, the smallest and highest wound surface was observed in the Scaffold and Control groups respectively (P <0.04). On 14th day, the smallest and highest levels of ulcers were observed in sham and control groups respectively (P <0.00). In the evaluation of wound healing on 7th and 14th days, the highest treatment rates were observed in the Scaffold and sham groups respectively, and on the 14th day there was no significant difference between the two groups (0.40). Polycaprolactone nano-fiber scaffold has a good compatibility with skin ulcers in rats and it can increase the rate and extent of wound healing in diabetic rats.

FSH is a heterodimeric glycoprotein that performs an important role in the regulation of reproductive processes. Over the past decades, injectable gonadotrophins have played a leading role in the treatment of infertility. The production of FSH in the country is one of the main goals around this drug. The aim of this study was to produce a semi- industrial recombinant FSH.   In this research study, the FSH gene contained within the pVITRO2-neo-mcs vector was transfected into the cell line of CHO after transformation in DH5α and plasmid purification. The amount of FSH in cell supernatant was measured by ELISA. The FSH protein was purified by HPLC. The presence of FSH protein after purification was confirmed by SDS-PAGE and Western blotting methods. Finally, the clinical effects of purified FSH on the ovary in the rat model were investigated.   The expression of the protein was determined by ELISA test at 450 nm that was 43.538 mIU/ml. In the HPLC purification step, the FSH peak was observed at a time interval of about 7.9 minutes, and the purification efficiency was 70%. The existence of a 45 KDa band on the pvdf membrane was confirmed after western blotting of FSH.  Increasing the weight of the ovary after the injection has confirmed the functionality of the protein.   At present, the production of recombinant hormone is one of the basic needs of every country. In order to arrive at this aim, a long-term planning is required. We are trying to pave the way for producing human FSH hormone as an effective recombinant drug in the treatment of infertility.

Hematopoietic stem cells are one of the new therapeutic options for treating skin ulcers. Recently, a new perspective has been developed to better utilize stem cells using nanofiber scaffolds. The present study was conducted to investigate the effect of polycaprolactone/gelatin (PCL/GT) nanofiber scaffold on the therapeutic function of hematopoietic stem cells. In this experimental study, 15 male BALB / c mice were divided into three groups of five, including the control group, the group receiving stem cells in the wound site (cell group) and the group receiving cell + PCL nanofiber scaffold. PCL/GT nanofiber scaffold was prepared by electrotherapy. After hematoxylin and eosin staining, the parameters of epidermal repair and hair follicle formation in the wound site were evaluated by fluorescence microscope and Image J and SPSS programs.
FINDINGS: On day 28 after transplantation, the highest and lowest epidermal thicknesses were observed in the cell + scaffold group and control group, which were 10.5±0.3 and 27.3±0.9 μm, respectively, which was significant (p<0.05). Moreover, the highest and lowest number of hair follicles were observed in the cell + scaffold group and control group, respectively; 5.2±0.2 and 4.2±0.3. The difference between the two groups was significant (p<0.01) Polycaprolactone / gelatin (PCL/GT) nanofiber scaffold significantly increases the therapeutic function of hematopoietic stem cells in the wound site

Lung cancer is the fifth most common cancer in Iran, with 10.5 and 1.5 per 100,000 in males and females, respectively. The study of latent tuberculosis infection (LTBi) in patients with lung cancer is significant due to the possibility of its activation during chemotherapy and increased mortality. Therefore, the aim of this study was to compare the prevalence of LTBi in patients with lung cancer with healthy individuals.
In this case-control study, which was performed from 2016 to 2017, 29 patients with newly diagnosed lung cancer and 40 healthy subjects were studied. Demographic data of all subjects were recorded in questionnaire. IGRAs (Quantiferon) were used to determine the LTBi.
The results of this study showed that prevalence of LTBi were 24.1% in lung cancer and 22.5% in the healthy group. The results of this study showed that smoking had a significant relationship with the risk of lung cancer and also LTBi infection in healthy people (p Since LTBi activates under chronic conditions such as malignancies, and because of high rates of LTBi in patients with lung cancer, it is recommended that screening for LTBi in high-risk individuals such as Lung cancer patients should be done before any treatment. Considering the role of smoking in lung cancer as well as the ability to develop LTBi in healthy people, attention to cessation of smoking in the health care program, prevention and treatment of pulmonary patients is recommended.

Cell therapy is one of the attractive and novel approaches in the treatment of chronic wounds. The aim of this study was to evaluate the function of bone marrow derived hematopoietic stem cells (CD93) in the treatment of diabetic ulcers.
In this study, 15 BALB/c strain mice, weighing 25-30 g were used, of which 10 were made diabetic by streptozotocin (STZ). Circular skin lesions 6 mm in diameter and 2 mm depth were created in the skin of mice. Studied mice were divided into 3 groups including normal mice without diabetes (sham), diabetic mice without transplanted CD93 cells (Control) and diabetic mice that underwent CD93 cell transplantation twice (density of cells: 1 × 107). The parameters of wound area, wound healing, differentiation and survival of CD93 cells were calculated on days 7, 14 and 28 after cell transplantation using the fluorescent microscope and DiL labeling antibody with Image J and SPSS softwares.
The most difference in the level and rate of healing was related to cell group and the control group, respectively (p CD93 stem cell transplantation significantly accelerated diabetic wound healing process and these cells are introduced as an appropriate option for diabetic wounds cell therapy.

Quercetin is a safe herbal metabolism which has effective role on inhibition of tumor cells and growth of many types of cancers. In this study to improve the efficiency and bioavailability of Quercetin molecule, Chitosan-functionalized nanoporous mesoporous Silica was used as a pH-sensitive biopolymer. For this purpose, at first nanoporous Mesoporous silica was synthesized by sol-gel method; then Chitosan layer was coated on nanoporous of silica using GPTMS in an acidic medium. Different analysis methods such as FESEM, BET and FTIR were used to characterize the synthesized nanocarrier. FESEM and BET analysis results demonstrated nanometric sizes of particles and porosities. FTIR analysis picks showed successful drug loading on nanocarrier. On the other hand, calculation of drug loading content and encapsulation efficiency in acidic and physiologic pH, illustrated that nanocarrier has suitable performance and stability for drug loading and release. Cytotoxicity of as-drug formulation in different concentrations was investigated by MTT assay on HeLa cells. The results showed that cytotoxicity of as-drug formulation increased in comparison to free drug and IC50 value of HeLa cells decreased from 58 M for free Quercetin to 36 M for loaded Quercetin. Eventually this study showed Chitosan-functionalized Mesoporous Silica nanocarrier could be considered as a smart and biocompatible drug delivery system to carry Quercetin drug for cancer cells treatment.

Infeliximab is a form of chimeric antibody which neutralizes the most important inflammatory cytokine, TNF-a, in inflammatory disorders. The aim of current study was to pilot expression of chimeric infliximab in Chinese Hamster ovary (CHO) cells.
In this research study, pVITRO2-neo-mcs vector that consist of infliximab light chain and heavy chain was used to transform into the E.coli by CaCl2 method. The plasmid was then purified and transfected to cultured CHO cells by Lipofectamine 2000® (Invitrogen GmbH, Germany). Transfected cells were selected upon G-418 treatment after 2 weeks and the level of expression, based on standard curve, was measured using IgG ELISA kit after 48 hours for each clone. High level expressed clone was then cultured in roller bottles and recombinant chimeric product was purified by protein A affinity chromatography. The purity of the product was analyzed by 10% gel SDS-PAGE from eluted samples. The efficacy of the purification was analyzed by ELISA before and after purification step. This article is a master's student thesis from February 2015 to August 2016 in pharmaceutical technology development center, Tehran University of Medical Sciences, Tehran, Iran.
The purified plasmid was analyzed on 2% agarose gel. After selective pressure of G-418, 10 stable transfect clones were assessed for infliximab secretion by IgG ELISA kit at 450 nm. The maximum and minimum expression which detected by ELISA were 23 ng/ml and 6 ng/ml, respectively. The band width of infliximab fraction during purification procedure was observed at 0.7-0.8 min. The efficiency of the purification by ELISA was 70%. On SDS-PAGE analysis, two bands, 25 and 50 kDa, respect to light and heavy chains of Infliximab, was confirmed the expression of recombinant protein.
In the current study, the construct for infliximab monoclonal antibody production was designed using genetic engineering techniques and the expression was confirmed by conventional molecular biology methods. The high yield production was carried out in semi-industrial scale using roller bottles with a 70 percentage of purification efficiency.

Ultraviolet (UV) radiation is a important disinfectant. Fungal infections with resistant isolates in patients culminate in recurrence of disease even with worse condition. This study was done to evaluate the efficacy of ultraviolet radiation on drug susceptibility of Candida Spp. to itraconazole، fluconazole and amphotericin B. This laboratory study was done on 12 Candida spp. isolated from patients according to NCCLS M27- A method. Samples were suspended with sterile saline and optical density was read by spectrophotometer at the wavelength of 530 nm. Serial dilutions (0. 0313-16 µg/ml) and (0. 0313-128 µg/ml) were supplied for itraconazole، amphotericin and fluconazole، respectively. MICs were determined after 48h incubation at 35°C. Following UV radiation for 1، 2، 5، 10، 60، 90 and 120 seconds MICs were determined، subsequently. The highest MIC pre UV radiation was (>128 µg/ml) for fluconazole. After UV radiation، MICs were steadily decreased for all mentioned drugs while after 10 sec، MICs of itraconazole and amphotericin B were >0. 0313 µg/ml. Secondary MICs significantly decreased with respect to MICs obtained in pre UV radiation (P<0. 05). UV radiation reduces MICs of Candida spp. to itraconazole، fluconazole، amphotericin B.

Aspergillosis is the most current causative agent of exogenous fungal nosocomial infection. This study was done to evaluate the drug susceptibility of Aspergillus flavus and A. fumigatus to itraconazole and amphotericin B. This Laboratory study was done on 25 Aspergillus fumigatus and 25 Aspergillus flavus species isolated from transplant''s patients. Drug susceptibility test was done according to NCCLS M38-P document. Fungal suspensions of mentioned fungi were supplied with ranges 0. 5–5×104 by spectrophotometer at 530 nm. Serial dilutions of drugs were supplied from 0. 03125 to 16 µg/ml and MICs determined following 48h incubation at 35°C. Obtained MICs ranges for Aspergillus fumigatus and Aspergillus flavus were 1-4 µg/ml and 0. 5–4 µg/ml for itraconazole، respectively while MICs ranges against Aspergillus fumigatus and Aspergillus flavus were 0. 5-2 µg/ml and 0. 25-2 µg/ml for amphotericin B، respectively. Amphotericin B MICs were significantly lower than itraconazole (P<0. 05). Aspergillus flavus and A. fumigatus were susceptible to amphotericin B and itraconazole.