Showing 9 results for Growth Factor
Hajighasemi F, Mirshafiey A,
Volume 66, Issue 12 (3-2009)
Abstract
Background: Vascular endothelial growth factor (VEGF) has mitogenic effect for endothelial cells and is an important mediator of tumor expansion, metastasis and angiogenesis in vivo. Isosorbide dinitrate, as a nitric oxide donor, has been widely used in treatment of many cardiovascular diseases such as congestive heart failure and acute coronary syndromes. Furthermore this drug was found to have inhibitory effect on angiogenesis, tumor growth and metastasis in vivo. In the present study we evaluated the isosorbide effect on the VEGF production using some human leukemic cell lines.
Methods: Human leukemic MOLT-4, JURKAT and U937 cells were cultured in complete RPMI medium. The cells at the exponential growth phase were then incubated with different concentrations of Isosorbide (4´10-7 -4´10-4 M) in the presence or absence of PMA (25ng/ml) for 24 hours. The VEGF concentrations in the culture supernatants were measured by enzyme immunoassay kits (R&D systems) according to the manufacturer's instructions.
Results: The level of VEGF produced by the human leukemic cell lines which was treated with different concentrations of isosorbide, did not show any significant difference with untreated control cells.
Conclusions: The results of this study showed that isosorbide had no significant effect on VEGF production. Our findings suggest that anti-angiogenesis effect of isosorbide could be mediated through VEGF-independent mechanism(s). Further studies are warranted to determine definite isosorbide effect on VEGF and other angiogenic factors production in patients as well as animal models.
Jeivad F, Abediankenari S, Shokrzadeh M, Ghasemi M, Taghvaei T, Ansari Z, Najafi Fard M, Hassannia H, Sayiari Mazandarani M, Biranvand E,
Volume 69, Issue 10 (1-2012)
Abstract
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Background: Gastric cancer is one of the most common diseases of digestive
system with a low 5-year survival rate and metastasis is the main cause of death. Multi-factors,
such as changes in molecular pathways and deregulation of cells are involved in
the disease development. Epidermal growth factor receptor pathway (EGFR) which is associated with cell
proliferation and survival can influence cancer development. EGFR function is governed by its
genetic polymorphism thus, we aimed to study the tyrosine kinase domain gene
mutations of the receptor in patients with gastric cancer.
Methods : In this experimental study, 123 subjects (83 patients with gastric cancer and 40
normal subjects) were investigated in
north of Iran for EGFR gene polymorphisms during 1 year. Genomic DNA was extracted by DNA extraction kit according to the manufacture's protocol. Polymerase
chain reaction single-stranded conformation polymorphism (PCR-SSCP) and silver staining
were performed for investigating EGFR gene polymorphisms.
Results : The participants included 72 men and 44 women. Gene polymorphism in exon 18 was present in 10% of the study population but SSCP pattern in exon 19 did not show different migrate bands neither in patients nor in
normal subjects.
Conclusion: It seems that
screening for tyrosine kinas gene polymorphism of epidermal growth factor receptor
in patients with gastric cancer and use of tyrosine kinas inhibitors could be useful
in the prevention of disease progress and improvement of treatment process for
a better quality of life in these patients.
Reza Yarani , Kamran Mansouri , Ali Bidmeshkipour , Maryam Mehrabi , Ali Ebrahimi , Kaikaoos Gholami , Kheirollah Yari , Ali Mostafaie ,
Volume 71, Issue 3 (6-2013)
Abstract
Background: Primary culture takes place following the cell isolation from tissues. Isolation and culture of melanocytes based on their roll in the protection of body against hazardous sun rays, production of skin, cornea and hair color is really important. This study was done to set isolation, culture and proliferation of melanocytes from children foreskin and adult eyelashes, and also comparison of two types of melanocyte culture medium.
Methods: Human foreskin and eyelash samples were used for melanocyte isolation and culture. After isolation of epidermis from dermis, epidermis cell suspensions were prepared by enzymatic digestion. The isolated cells were cultured in two melanocyte selective culture media. Immunocytochemistary and reverse transcription-polymerase chain reaction (RT-PCR) assays were used for confirmation of isolated and cultured melanocytes.
Results: Our results indicated that isolated melanocyte cultured in the selective medium without phorbol esters is better than the melanocytes cultured in selective medium cont-aining phorbol esters not only morphologically but also physiologically and from the aspect of cell adhesion. In addition, the results showed that isolated melanocyte from adult eyelashes are more dendritic than melanocytes isolated from children foreskin. Conversely, our results indicated that the number of cell passages in melanocyte isolat-ed from foreskin is more than melanocytes isolated from adult eyelashes.
Conclusion: Melanocytes cultured in selective medium containing convenient growth factors in absence of phorbol esters show more native physiological and adhesive properties. In addition, melanocyte isolated from younger tissues such as foreskin have better proliferative and sub-culturing properties so we suggest isolation and culture of younger tissues.
Farideh Zafari Zangeneh, Mohammad Mehdi Naghizadeh , Masoumeh Masoumi ,
Volume 74, Issue 7 (10-2016)
Abstract
Background: Polycystic ovary syndrome (PCOS) is a common complex condition in women associated with reproductive and metabolic systems and also psychological disorders. There is considerable evidence to suggest that the sympathetic nervous system is involved in PCO and metabolic syndromes. Noradrenalin (NA), corticotrophin releasing hormone (CRH) and nerve growth factor (NGF) are the strong stimulants for two axes: hypothalamic-pituitary-adrenal (HPA) and hypothalamic-pituitary-ovarian (HPO) axes which are regulators for the female reproductive system. Following previous studies on sympathetic nervous system over activity in PCOS, the main purpose of this study is to evaluate the role of CRH and NGF as two important findings from the perspective of the psycho-emotional.
Methods: This case-control study was conducted in Reproductive Health Research Center of Imam Khomeini Hospital, Tehran, Iran in the September of 2011. 170 women participated in this study. The diagnosis of PCOS was made according to the joint criteria of the European Society of Human Reproduction and Embryology and the American Society of Reproductive Medicine (ESHRE/ASRM). All women have 20-40 years of age and body mass index (BMI) of less than 28. Demographic questionnaire was used in this study and blood sample was obtained from all participants before 8AM. All analysis was done in SPSS software, version 19 (IBM SPSS, Armonk, NY, USA). P-value less than 0.05 considered as significant level.
Results: Serum levels of CRH and NGF in patients with polycystic ovary was significantly lower than the control group (P< 0.001). This reduction can disrupt two neural axes: the sympathetic nervous system (SAS) and hypothalamus-pituitary-adrenal (HPA). These axes have a fundamental role in psycho-emotional reactions in women with PCOS. Moreover, using demographic questionnaire quantitative and qualitative characteristics of the population studied, the results of which are reported in the regression model.
Conclusion: The results of this study confirmed previous studies. This reduction in serum levels of CRH and NGF shows the hyperactivity of sympathetic nervous system in polycystic ovary syndrome can be one of the causes of mental disorders in women with PCOS.
Mohammd Javad Fatemi , Shirin Chehroudi , Tooran Bagheri , Sahar Saleh , Amir Atashi , Mohsen Saberi , Seyed Aboozar Hoseini , Shirin Araghi ,
Volume 74, Issue 12 (3-2017)
Abstract
Background: Acute and chronic wound healing has always been problematic. Stem cells with or without the scaffold carrying these cells have been proposed as new methods in the treatment of wounds. In this case study we have tried to examine the effect of scaffold made of polyether sulfone (PES) alone, with stem cells and along with stem cell and growth factor on wound healing in rats.
Methods: This experimental study was conducted in Animal Laboratory of Hazrat Fatemeh Hospital in 2012. In this study, 48 rats were randomly divided into four groups. A wound created on the back of each rat at the size of 3×3 cm. The surface of the wound in the first group is covered with PES seeded with adipose-derived stem cell (ASC) and growth factor (GF), in the second group with polyether Sulfone seeded with ASC, in the third group only with PEWS, and in the fourth group (control) with Vaseline gauze. On 20th and 35th days, the surface of the wound was assessed by photography in order to understand the process of healing. In addition, on days 20 and 45, the histopathology characteristics of the samples were studied with a biopsy of the wounds.
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Results: The Results of wound healing in the control group was better than the other groups and its statistical difference between others was meaningful. (P=0.008, P=0.013, P=0.001) On day 20, by examining histopathological characteristics including epithelialization, the number of inflammatory cells, the amount of angiogenesis and collagen synthesis in control group, we gained better results. (P=0.000), But on day 45, the results in different parameters were not equal.
Conclusion: polyether sulfone scaffold alone or with adipose-derived stem cells couldn’t improve the process of wound healing. Also adding vascular endothelial growth factor (VEGF) did not change the results significantly.
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Zahra Ousati Ashtiani , Javad Tavakkoly-Bazzaz , Seyed Alireza Salami , Mohammad Reza Pourmand , Gholamreza Pourmand ,
Volume 75, Issue 6 (9-2017)
Abstract
Background: Aberrant pre-mRNA alternative splicing is a common event in cancer cells. Many abnormally spliced RNA variants have been observed in tumor cells and they can be used as biomarkers or therapeutic targets in new drug design. Increasing our knowledge in understanding the mechanisms of alternative pre-mRNA splicing for cancer-related genes and determination of cancer specific isoforms are important for the development of new strategies in cancer therapy. The aim of this study was isoforms identification and expression of PIK3CA, FGFR3 and FGFR1 genes in bladder cancer by RNA Sequencing and Real-Time PCR.
Methods: This cross-sectional study was conducted at Urology Research Center of Sina Hospital, Tehran University of Medical Sciences, Tehran, from September 2014 to October 2016. Paired tumor and adjacent normal tissues samples were obtained from 30 bladder cancer subjects. Total RNAs were extracted from bladder tumor and normal tissues. Quantitative and qualitative examinations have been done. After quality control, fragmentation of RNAs and cDNA library construction, next-generation RNA sequencing was performed. Resulting raw data were analyzed with different bioinformatics software. Differential expression was confirmed by Real-Time PCR.
| Results: RNA sequencing results showed the number of PIK3CA (1 vs 3), FGFR3 (7 vs 6) and FGFR1 (9 vs 12) isoforms and their expression were different in bladder normal tissues in comparison to tumor tissues. Overexpression of PIK3CA gene have been observed in 42% of tumor samples but statistically was not significant. Increased FGFR3 gene (P=0.01) and decreased FGFR1 (P=0.01) expression were significant. There was an association with overexpression of FGFR3 and cigarette smoking ((P=0.037) and family history (P=0.004). |
Conclusion: RNA sequencing make possible to do the accurate assessment of transcript abundance and identification of different isoforms resulted from aberrant pre-mRNA alternative splicing, which is a crucial process for the maturation of transcripts of multi-exon genes. Regarding the differences in isoforms expression in tumor and normal tissues of bladder cancer, they have potential to be used as biomarkers and sensitive targets for cancer therapy.
Masumeh Gity , Ali Borhani , Mehrdad Mokri , Majid Shakiba , Morteza Atri , Nasim Batavani ,
Volume 76, Issue 8 (11-2018)
Abstract
Background: Estrogen-negative breast cancers have different clinical course, prognostic features and treatment response in comparison to estrogen receptor-positive (ER-positive) breast cancers. Human epidermal growth factor receptor 2 (HER2) oncoprotein has found to have a pivotal role in natural cell growth and cell division and is suggested to be directly related to tumor invasiveness in breast cancer patients. The purpose of this study was to retrospectively assess the mammography, ultrasound, and magnetic resonance imaging (MRI) features of estrogen negative breast cancers with and without overexpression of HER2/neu receptor.
Methods: In this cross-sectional retrospective study, mammographic, ultrasound and MRI features as well as HER2 status were assessed in patients with ER-negative breast cancer that were referred to Cancer Institute of Imam Khomeini Hospital Complex in Tehran from October 2015 to October 2017. Clinicopathologic data and mammography, ultrasound, and MRI features were reviewed and were correlated with HER2 status of estrogen-negative tumors.
Results: Of the 172 patients with ER-negative breast cancer, 101 patients were positive for HER2/neu receptor (58.8%). There was a significant correlation between HER2-positivity and tumor type (P=0.004). Among estrogen negative breast cancers, significant association were found between HER2 and tumor histologic grade (P=0.024) and TNM stage (P=0.021). HER2-positive tumors were more likely to present with microcalcification (P=0.007) and have irregular shapes (P=0.034) in mammography than HER2-negative tumors. No association was found between HER-2 status and tumor size, shape, margin, posterior feature, halo or orientation of the tumor in ultrasound. We also found no correlation between HER2 status and MRI features including mass shape or margin, internal enhancement pattern or curve type among estrogen-negative breast cancers.
Conclusion: Findings of this study showed that among estrogen-negative breast cancers, HER2/neu positive tumors are more likely to be diagnosed at higher stage and have higher histologic grade at the time of diagnosis. Tumor mass shape and microcalcification in mammography are found to be associated with HER2 status among patients with estrogen-negative breast cancer.
Ali Salehi , Mohammad-Ali Abtahi , Seyed-Hossein Abtahi , Hasan Razmjou , Mohammad Tohidi , Mojtaba Akbari , Hamidreza Jahanbani-Ardakani ,
Volume 77, Issue 5 (8-2019)
Abstract
Background: Retinal vein occlusions are one of the most common form of retinal vascular disorders and could lead to vision loss due to macular edema, macular ischemia and sequelae from neovascularization. Anti-venous endothelial growth factor (anti-VEGF) treatment is the choice strategy of treatment for patients with macular edema secondary to central retinal vein occlusion (CRVO). There is an evidence of body with the controversies regarding increment of choroidal thickness in CRVO condition. The current study was designed to determine whether baseline subfoveal choroidal thickness may be an indicator for visual and anatomical outcome of bevacizumab in patients with CRVO macular edema.
Methods: This study was a prospective clinical cohort study that enrolled in 23 new cases of treatment-naïve central retinal vein occlusion (CRVO) from February to July 2017 who were visited in Feiz Eye Hospital, Isfahan, Iran. Patients received a single injection of bevacizumab and were followed for 30 days. Ratio of subfoveal choroidal thickness (SFCT) was measured using enhanced depth imaging spectral-domain optical coherence tomography (EDI-OCT). Ratio of SFCT of the CRVO eye to the fellow healthy eye (SFCT1/F) was taken as independent variable. Changes of best-corrected visual acuity (BCVA) in LogMAR (ΔBCVA, functional response) and secondary to baseline central macular thickness ratio (CMT2/1, anatomical response) in the CRVO eyes were taken for comparative and correlative analytics.
Results: A total of 46 eyes from 23 patients with the mean age of 64.60±10.19 years were included in this study. Baseline SFCT was higher in CRVO eyes (251.91±46.09 µm) in comparison to the fellow eye (206.95±26.62, P<0.0001). Also central macular thickness in CRVO eyes were significantly higher in CRVO eyes in comparison with fellow eye (531.04±38.22 vs 303.30±33.59, respectively, P<0.05). SFCT1/F, correlated moderately with anatomical (CMT2/1) and strongly with functional response (ΔBCVA).
Conclusion: Bilateral evaluation of SFCT by EDI-OCT in all newly diagnosed CRVO cases is recommended to determine if there is a relative increase in choroidal thickness. This may help predict short-term response to anti-VEGF therapy.
Mohammad Ali Gharaat , Yaghoob Mehri Alvar,
Volume 81, Issue 6 (9-2023)
Abstract
Background: Angiogenesis is a physiological process leading to capillary density enhancement and better blood distribution in skeletal muscles, which triggers in response to physical training. The present study aimed to investigate the changes in physiological factors involved in angiogenesis in response to circuit or traditional resistance training.
Methods: Thirty-six healthy sedentary students who were studying at Shahid Rajaee Teacher Training University of Tehran (age: 22.1±2.3 years; height: 172.7±5.1 cm) volunteered to participate in the study (from October 2021 to February 2022). Following a pre-test to evaluate one repetition maximum (1RM) of selected movements (Leg Press, Leg Curl, Leg Extension, Bench Pull, Seated Row, Biceps Curl), subjects randomly divided into Circuit Resistance training (CRT) (training protocol included 4 circles/3 times a week/8 weeks circuit performance/50-55% 1 Repetition Maximum (1RM), n=12), Traditional resistance training (RT) (training protocol included 8 repetition/3 set/3 time per week/8 weeks of same movements with 75% 1RM followed by 2 minutes break to rest between the sets; n=12) and the control group without any regular training (n=12). We assessed the level of Vascular Endothelial Growth Factor (VEGF), plasma level of growth hormone (GH), and Basic Fibroblast Growth Factor (BFGF) to the mentioned training methods. Data were evaluated by utilizing SPSS version 14.
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Results: Present findings showed that CRT and RT protocols resulted in significant increases in post-test compared to pre-test in VEGF (P=0.00), GH (P=0.04), and BFGF (P=0.00). In addition, the magnitude of changes in VEGF and GH were significantly greater than the magnitude of changes in control group in post-test (P=0.03, and 0.001, respectively). Furthermore, there was a strong correlation between absolute values of GH and VEGF (r=0.74 and r=0.71) following CRT (P=0.01) and RT (P=0.02).
Conclusion: This study demonstrated that CRT and RT might enhance angiogenesis through an increase in VEGF, bFGF and GH, leading to better blood distribution in muscles.
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