Muneo Numasaki; Koyu Ito
Abstract
Background: Interleukin (IL)-17A possesses biological activities to promote vascular endothelial cell migration and microvessel development. Objective: To clarify which angiogenic factors are involved in IL-17A-modified angiogenesis-related functions of vascular endothelial cell migration and microtube ...
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Background: Interleukin (IL)-17A possesses biological activities to promote vascular endothelial cell migration and microvessel development. Objective: To clarify which angiogenic factors are involved in IL-17A-modified angiogenesis-related functions of vascular endothelial cell migration and microtube development or not. Methods: The potential contribution of various angiogenic stimulators to in vitro angiogenic activities of IL-17A was assessed with both modified Boyden Chemotaxicell chamber assay and in vitro angiogenesis assay. Results: The addition of a neutralizing antibody (Ab) for hepatocyte growth factor (HGF), basic fibroblast growth factor (bFGF) or vascular endothelial growth factor (VEGF)-A to the upper and lower compartments in a modified Boyden Chemotaxicell chamber significantly attenuated human dermal microvascular endothelial cell (HMVEC) migration elicited by IL-17A. Moreover, IL-17A-induced capillary-like microvessel development in human umbilical vein endothelial cell (HUVEC) and human dermal fibroblast (HDF) co-culture system was significantly impaired by a neutralizing Ab against HGF, bFGF, VEGF-A, cysteine-x-cysteine ligand 8 (CXCL8)/IL-8 or cysteine-x-cysteine (CXC) chemokine receptor (CXCR)-2. Conclusion: Our findings demonstrate the involvement of HGF, bFGF, VEGF-A and/or CXCL8/IL-8, to various degrees, in migration and microvessel development of vascular endothelial cells mediated by IL-17A.
Maimun Zulhaidah Arthamin; Anis Sulalah; Resvina -; Chomsin Sulistya Widodo; Agustina Tri Endharti; Edi Widjajanto; Tedy Juliandhy
Abstract
Background: Although there have been many studies investigating the effects of electromagnetic fields on humans cells and tissues, the effects of radiofrequency electromagnetic fields exposure on the cells of the immune system are still controversial. Objective: To investigate the effects of 1800 MHz ...
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Background: Although there have been many studies investigating the effects of electromagnetic fields on humans cells and tissues, the effects of radiofrequency electromagnetic fields exposure on the cells of the immune system are still controversial. Objective: To investigate the effects of 1800 MHz RF-EMF exposure on peripheral blood mononuclear cells by measuring T helper cells count and the cytokine profile under different conditions of durations and distances. Methods: The peripheral blood mononuclear cells (PBMCs) from healthy human subjects were exposed to 1800 MHz RF-EMF, with durations of 15, 30, 45, and 60 minutes and distances of 5 and 25 cm. The effects of RFEMF exposure on the number of CD4+ T cells, and the expression of IL-2,IL-10, and IL-17a after 48 hours of culture were evaluated using flow cytometry. Results: Our findings indicated that closer distance and longer exposure inducedlower number of CD4+ T cells. Similarly the percentagesof IL-2, IL-10 and IL-17a expressing CD4+ T cells weredecreased significantly. The number of IL-2 expressing CD4+T cells wasincreased significantly as the duration of exposure was increased, but the number was decreased after 60 minutes exposure when compared with control group with no exposure. Conclusions: Exposure to RF-EMF for 60 minutes at 5 cm distance causes a significant reduction in the number of CD4+ T cells, IL-2, IL-10 and IL-17a expressing T cells.
Mohammad Hossein Nikoo; Seyed Rahmatollah Taghavian; Hossein Golmoghaddam; Narges Arandi; Alireza Abdi Ardekani; Mehrnoosh Doroudchi
Volume 11, Issue 4 , December 2014, , Pages 246-258
Abstract
Background: Atrial Fibrillation (AF) is the most common cardiac arrhythmia and an independent risk factor for stroke among the elderly. A role for inflammation in the atrial remodeling as well as development and recurrence of AF is known. Objective: To compare IL-17A between patients with different types ...
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Background: Atrial Fibrillation (AF) is the most common cardiac arrhythmia and an independent risk factor for stroke among the elderly. A role for inflammation in the atrial remodeling as well as development and recurrence of AF is known. Objective: To compare IL-17A between patients with different types of AF and healthy individuals. Methods: IL-17A was measured in sera of 112 patients and 107 healthy age/sexmatched controls using ELISA assay. In sera of 26 patients with elevated IL-17A (>1 Pg/ml), CCL5 and CCL18 levels were also measured. Results: IL-17A was significantly increased in patients with AF compared to controls (1.28 ± 3.5 vs. 0.19 ± 0.64 Pg/ml, p=0.001). There was no significant difference in the level of IL-17A between different types of AF. IL-17A was significantly higher in patients with a history of coronary artery bypass graft compared to other patients (p=0.01). A significant positive correlation between IL-17A and CCL18 concentration was found (p=0.001). An increase in the Neutrophil/Lymphocyte ratio (NLR) was observed in patients with elevated serum IL-17A compared to other patients (p=0.006). Male patients showed higher increase in NLR (p=0.007) which was accompanied by a decrease in CCL5 (p=0.000) and a marginal increase in CCL18 (p=0.085) compared to females. There was an increase in CCL5 levels in patients receiving Acetylsalicylic Acid (ASA) therapy (p=0.046). Conclusions: The increase in IL-17A levels is related to the AF pathology mediated by neutrophils and monocytes. The current study signifies the role of immune cells and cytokines in the pathology of AF.
Zohreh Babaloo; Farhad Babaie; Mehdi Farhoodi; Mohammadreza Aliparasti; Behzad Baradaran; Shohreh Almasi; Ahmad Hosseini
Volume 7, Issue 4 , December 2010, , Pages 1-1
Abstract
Bakground: Multiple sclerosis (MS) is a CD4+ T cell-mediated autoimmune disease affecting the central nervous system (CNS). It was previously believed that Th1 cells were pathogenic T cells in experimental autoimmune encephalomyelitis (EAE). However, the functional role of Th1 cells in EAE has been reconsidered ...
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Bakground: Multiple sclerosis (MS) is a CD4+ T cell-mediated autoimmune disease affecting the central nervous system (CNS). It was previously believed that Th1 cells were pathogenic T cells in experimental autoimmune encephalomyelitis (EAE). However, the functional role of Th1 cells in EAE has been reconsidered upon the discovery of IL-17- producing T cells which are consider as dominant effectors for inducing autoimmune tissue inflammation. Objective: The objective of this study was to assess the role of IL-17A and IL-17F in MS pathogenesis. Methods: We evaluated mRNA expression of IL-17A and IL-17F in thirty-five Iranian patients with relapsing–remitting MS (RRMS) and twenty-five healthy controls by Quantitative Real Time PCR. Results: The results of this study showed a twenty-fold increase in the expression of IL-17A mRNA in MS patients compared to the control group (p < 0.0001 ). IL-17F mRNA expression in MS patients was thirty three-times greater than control group (p = 0.0008). IL-17A mRNA expression in periphery was positively correlated with expression of IL-17F transcripts in MS patients and controls (p < 0.01 and p < 0.05, respectively). Conclusion: These results indicate the critical role of Th17- mediated cytokines in development of MS which classically has been considered as a Th1-mediated disorder. The results of this study showed, for the first time, the importance of IL-17F in MS immunopathogenesis.
