فهرست مطالب

  • Volume:4 Issue: 3, 2017
  • تاریخ انتشار: 1396/06/31
  • تعداد عناوین: 9
  • Fariba Mohebichamkhorami, Akram Alizadeh * Pages 615-623
    Skin substitutes can help skin repair and regeneration, and restore the efficient properties of skin in the time of acute burn injuries or other chronic skin lesions. They have been beneficial for replacement or reconstruction of one or both layers of the skin and can act as permanent skin replacements or temporary wound covers, depending on their composition and design. There are many different classifications of currently available skin-substitutes and each of these has their own advantages and applications but none of them can fully simulate native skin yet.
    Currently, accessible substitutes have several limitations such as infection, reduced vascularization and integration to host tissue. Also various cells responsible for temperature control and insulation, pigmentation, immune regulation and nerve supply are absent. Recent studies removed some obstacles but till date, no ideal skin substitute has been developed and further research will require to resolve different issues and suggest practical solutions toward a true and native-like skin substitute with excellent engraftment and durable viability.
    In developing countries, availability and awareness of these skin substitutes is not adequate in spite of the number of cases that require this kind of treatment, therefore, it is needed to develop indigenous economical technology to promote available treatments in hope to achieving substitutes with higher quality and reasonable cost that could be available to a greater percentage of patients.
    Keywords: Tissue-engineered skin, skin substitute, wound healing, Commercial products, USFDA
  • Mahsa Gheysour, Shahab Faghihi * Pages 625-631
    Post-surgery infections and not effective integration represent a serious issue in the Titanium (Ti) based implants function for a long term stability. To reduce such issue various surface functionalization method including surface coating has been explored. Here we successfully coated Ti substrates with Graphene Oxide (GO), Chitosan (Cs), and nanocomposite of GO and Cs (GO/Cs) via spin coated method to evaluate the osteogenic properties of each coatings. Uncoated Ti substrates were used as control. Scanning electron microscopy was used to investigate the coating morphology. Surface roughness measurements were achieved from atomic force microscopy. To measure surface wettability, contact angels method was performed. Ti substrates coated with Cs (TiCs) and Cs/GO (TiCs/GO) showed the highest surface wettability compared to Ti substrates coated with GO (TiGO) and the control. The highest surface roughness was also observed in TiCs/GO. To test cellular attachment and proliferation the samples were exposed to human osteoblast-like MG63 cells after 2 hours, 4 hours, 6 hours, 1 day, 3 days, and 1 week. MTT [3-4,5 dimethyl- thiazol-2yl (2,5diphenyl-2H-tetrazoliumbromide)] assay was performed to measure the percentage of cellular attachment and proliferation for each coatings. Cell adhe- sion and cell proliferation was most improved in TiCs followed by TiCs/GO. Corro- sion resistance of the coatings was investigated using potentiodynamic polarization test in simulated body fluid. The result indicated that the nanocomposite coating could provide effective protection of Ti substrates from corrosion.
    Keywords: Titanium, Chitosan, Graphene Oxide, Nanocomposite, Surface Modification
  • Mitra Yazdi Yahyaabadi, Ghambar Sultan Dorraj, Mohammad Heiat *, Ali Mohammad Latifi Pages 633-638
    Staphylococcus aureus is one of the most important pathogens in hospital- acquired infections. Annually, many people are infected with S. aureus in hospitals. Rapid detection of this bacterium is extremely helpful in preventing and managing this bacterium mediated diseases. Aptamers are powerful probes, which can be used as a target explorer in a wide range of diagnostic systems.To isolate a specific aptamer against S. aureus, a library of single-stranded DNA molecules was designed, and enriched through Cell-SELEX procedure. In the Cell-SELEX, the DNA library was exposed to the S. aureus bacterium in 8 reiterative quadruple rounds including: binding, separation, elution and amplification. After 8 rounds, the PCR product was cloned and sequenced. Cloned aptameric sequences were evaluated through enzyme-linked oligonucleotide assay (ELONA), and a sequence with the best outcomes was selected as ideal aptamer. Eight rounds of Cell-SELEX procedure led to isolation of a specific ssDNA aptamer against S. aureus and named as “STAPT” (conflation of STAphylococcus and APTamer). Using ELONA 3 technique, the detection limit of this aptamer was determined as 4 × 10 CFU/ml. The aptamer “STAPT” showed the promising and potent abilities and features to be utilized as a bio-detection element likely in advanced detection systems. Although more extended researches are needed for this purpose.
    Keywords: Staphylococcus aureus, Detection, Aptamer, Cell-SELEX, ELONA
  • Sheyda Bahiraii *, Ghasem Ahangari, Abbas Mirshafiey, Mehdi Razazian, Farkhondeh Mohammadi Pages 639-643
    Gasoline containing different chemical compounds especially aromatic compounds such as benzene, xylene, toluene and ethylbenzene which are the most dangerous compounds. Gas station workers have the highest potential for exposure to gasoline evaporation. Many studies have investigated the effect of gasoline vapors and cause of death in people working in gas stations. According to reports, the cause of death of these people is mainly due to cardiovascular disease, lung cancer, leukemia and other cancers in the world. With regard to the harmful effects of gasoline vapors on health and the importance of the relationship between the immune system and nervous, in this study we investigated alternations in gene expression pattern of the serotonin 5-Hydroxytryptamine 2A (5-HT2A) receptor and type A gamma- aminobutyric acid (GABAA) receptor in peripheral blood mononuclear cells (PBMCs) of people working in gas stations, Tehran. For this purpose, The PBMCs were separated from whole blood of 30 gas station workers and 30 normal by Fi- coll-hypaque. The total RNA was extracted and the cDNA was synthesized. This process was followed by Real-time PCR using specific primers for 5-HT2A and GABAA receptor mRNAs. Results have shown a significant increase (P = 0.001) in relative gene expression of 5-HT2A receptor whereas relative expression of GABAA receptor was significantly decreased (P = 0.004) in PBMC compared with normal control peoples. According to the role of the serotonin in asthma and due to the importance of the activity of this neurotransmitter through 5HT2A receptor which has a significant increase in patients with allergic asthma it can be concluded that workers in the gas station may be more susceptible to developing allergic asthma. On the other hand, low expression of GABAA receptor is associated with mental health problems such as depression, so it can also be concluded that people working at the gas station are more exposed to these health problems in comparison to nor- mal people.
    Keywords: Gasoline, Gas Station, Gene Expression, 5-HT2A Receptor, GABAA receptor, Real-time
  • Hengameh Taherii *, Mansour Ghesmati, Ali Akbar Meratan, Payam Pour Mohammadi Pages 645-650
    Valerenic acid (VA) as a sesquiterpene constituent responsible for medicinal properties is derived from valeriana (Valeriana officinalis). It is well documented that the mutualistic basidiomycete Piriformospora indica substantially promotes secondary metabolites production. Nevertheless, our knowledge about molecular mechanism involved is rudimentary.
    In this study, we aimed to find the effect of P. indica cell wall extract (CWE) in modulation of transcriptional rate of sesquiterpene synthese (Sesqui-TPS). genes involved in VA biosynthesis in the host plant, V. officinalis.
    Material and
    Relative expression of putative terpene syntheses (VoTPS1, VoTPS3 and VoTPS7) genes was quantified by quantitative real time PCR (qRT-PCR) in the roots of valerian plants inoculated by two concentrations of the extract (2 and 4 % v/v) prepared from the cell wall of P. indica for various time intervals. As well as, VA content of roots of V. officinalis was measured.
    The 4% fungal CWE application produced more VA than 2% CWE treated plants at the exposure time of 72 h. Such enhancement was correlated with increased transcript expression of two sesquiterpene synthases (sesqui-TPSs) including VoTPS1 and VoTPS7 which provided intermediates probably serving in the VA-biosynthetic pathway, while different expression pattern of VoTPS3 showed that it probably has no influence on the biosyntheesis of VA.
    Since the accumulation of VA is a dose (and time)-dependent response at roots of V. officinalis, the present study suggests that the mechanism(s) responsible for the enhancement of VA could be related to the fungus-plant association.
    Keywords: Piriformospora indica, Sesquiterpenes Synthase, Valeriana officinalis, Valerenic acid
  • Parvin Norouzi, Ahamad Ismaili *, Farhad Nazarian Firouzabadi, Ali Mohammad Latifi Pages 651-655
    Poppy (Papaver somniferum) is the most important commercial source of analgesic drugs and of compounds related to them. Because of the excellent medicinal prop- erties of poppy, finding genotypes with changed alkaloid content through breeding or by producing transgenic plants in tissue culture has attracted great interest. The present research was conducted to optimize rooting in somatic embryos of trans- genic poppy plants. Sensitivity of hypocotyl explants to the antibiotic paromomycin was first determined in kill-curve experiments. Transformation of the hypocotyl explants was carried out using the GV3101 strain of Agrobacterium tumefaciens having the vector with the NPT II gene. The explants were then transferred to MS- based medium containing the 2, 4-D plant growth regulator (PGR) at 1 mg/L, 10 mM MES, and paromomycinat 15 mg/L. After the somatic embryos were pro- duced, a factorial experiment was conducted in the rooting stage with two factors including medium (MS and 1/2 MS) and PGR (500 μM IBA PGR and no PGR). Also, confirmation of derived transgenic plantlets was confirmed by PCR tech- nique. Results of ANOVA and comparison of the means indicated the highest root- ing percentage happened in the 1/2 MS medium containing the IBA.
    Keywords: Agrobacterium, Papaver somniferum, Somatic Embryosis, Paromomycin, Rooting
  • Zeynab Kahnouij, Gholam Reza Sharifi Sirchi *, Hossein Ali Sassan Pages 657-660
    Lemongrass (Cymbopogon olivieri) is highly cross-pollinated and fragrant herb plant. Because of so worthy essential oil components, it is widely used in cosmet- ics, food, and medicine industry. The C. olivieri leaves of 4 populations were sampled from South and Southeast Iran. Random amplified polymorphic DNA (RAPD) markers used to assess the population structure and genetic variation. In total, 32 polymorphic bands amplified from 11 effective chosen RAPD markers. Cluster analysis using UPGMA method divided the populations into 2 main groups. A high cophenetic correlation coefficient (r = 0.90) was obtained. The pale yellow essential oils were used for GC-MS analysis. Pipertone, carrene, elemol, limonene, benzene, α-pinene, linalool, azulene and calarene were the components with the highest amount found in this study. The high genetic and phytochemical diversity among studied C. olivieri population was observed which could be applied in fol- lowing breeding and gene bank conservation programs.
    Keywords: Cymbopogon olivieri, Essential Oil, Cluster Analysis, RAPD Marker, GC-MS
  • Tayebeh Pourjafar Devin, Zahed Ahmadi *, Faramarz Afshari Taromi Pages 661-668
    Bio-based polymers have attracted significant attentions because of their renewable nature which can be a substitute of petroleum-based polymers; moreover, such polymers do not pollute the environment due to their degradable nature. In this research,the poly lactic acid (PLA) and poly-3-hydroxybutyrate (PHB) blend, as biodegradable polymers, behavior was investigated. Different ratios of PLA/PHB blend were prepared using solution casting method in the presence of the pyromel- litic anhydride (PMDA) as acompatibilizer. DSC results revealed that the PMDA presence caused to separation of α-helix crystals and β-plate in two polymers re- sulting in phase separation via altering the crystallinity rate. PMDA can control the crystallization phenomenon which affected the crystallization rate, percentage and crystal size. Low molecular interaction was observed using the XRD results of pure and blended samples. SEM images of samples with higher content of PLA illu- strated the homogeneous dispersion of PHB. Ring opening reaction of PMDA re- sulted in increasing the acidic number of samples which indicated the weak interac- tion with active group of polymers. It was observed no shit in IR peaks which indi- cated the incompatibility of these two polymers. Results shed light on the PMDA behavior in PLA/PHB blend which PMDA in spite of controlling the crystallinity behavior of the blend, cannot improve the compatibility and mixing.
    Keywords: Polylactic Acid, Poly-3-hydroxybutyrate, Pyromellitic Anhydride, Crystallinity, Biodegradable polymers
  • Khadijeh Eskandari, Hedayatollah Ghourchian, Aghdas Banaei * Pages 669-674
    A feasible and fast method for Adult Hemoglobin (A-Hb) and Fetal Hemoglobin (F-Hb) study was developed by immobilization of Hb on gold-coated magnetic iron oxide nanoparticles (GMNPs).The prepared GMNPs composite nanoparticles with 60 nm diameter were used as a carrier for the immobilization of Hb. The A-Hb and F-Hb were physically attached to the GMNPs nanoparticles. The direct electroche- mistry of F-Hb and A-Hb showed a quasi-reversible cyclic voltammogram corres- ponding to the Heme group with a formal potential of 314 and -334 mV in 0.1M PBS (pH 6.2), respectively. The apparent charge transfer rate constant (ks) and transfer coefficient (α) for electron transfer between the electrode surface and pro- tein were calculated as 0.29/s and 0.1 for F-Hb and 0.21/s and 0.47 for A-Hb. The linear concentration rangesare17.3–225 and 7.4-53 mM for F-H band A-Hb biosen- sors for H O detection. The lifetime of biosensor is more than 2 weeks.
    Keywords: Biosensor, Direct Electrochemistry, H2O2, Gold-coated, Iron Oxide Nanoparticles, Hemoglobin