Seyed Davar Siadat
Associated professor of Pasteur institute of Iran, Research Center of Microbiology, Department of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran.
[ 1 ] - Cloning of conserved regions of nontypeable Haemophilus influenzae hmw1 core binding domain
Colonization of nontypeable Haemophilus influenzae (NTHi) in nasopharynx causes respiratory tract disease. In 80% of clinical isolates, HMW proteins are the major adhesions and induce protective antibodies in the hosts. Therefore, it can be used as a vaccine candidate. The aim of this study is designing and cloning of the conserved regions of NTHi hmw1 core binding domain.In this study, the sta...
[ 2 ] - Selective Cyclooxygenase-2 Inhibitor Compound 11b Improves Haloperidol-Induced Catatonia by Enhancing the Striatum Dopaminergic Neurotransmission
The aim of this research was to investigate the Cyclooxygenase-2 (COX-2) selective inhibition effect on haloperidol-induced catatonia. In this study, the effect of orally, acutely and Sub-chronically administrations of compound 11b [1-(phenyl)-5-(4-methylsulfonylphenyl)-2-ethylthioimidazole] (2, 4 and 8 mg/kg), a newly selective COX-2 inhibitor, was investigated against the haloperidol-induced ...
[ 3 ] - Selective Cyclooxygenase-2 Inhibitor Compound 11b Improves Haloperidol-Induced Catatonia by Enhancing the Striatum Dopaminergic Neurotransmission
The aim of this research was to investigate the Cyclooxygenase-2 (COX-2) selective inhibition effect on haloperidol-induced catatonia. In this study, the effect of orally, acutely and Sub-chronically administrations of compound 11b [1-(phenyl)-5-(4-methylsulfonylphenyl)-2-ethylthioimidazole] (2, 4 and 8 mg/kg), a newly selective COX-2 inhibitor, was investigated against the haloperidol-induced ...
[ 4 ] - تشخیص مولکولی ژن بتالاکتامازblaCTX-M در سویه‌های کلبسیلا پنومونیه جدا شده از نمونه‌های بالینی
سابقه و هدف: امروزه باکتری‌های تولید کننده آنزیم‌های بتالاکتاماز وسیع‌الطیف (ESBL) در سراسر جهان رو به افزایش هستند. تولید این آنزیم‌ها مهمترین عامل مقاومت به سفالوسپورین‌های وسیع الطیف در کلبسیلا پنومونیه می‌باشد. در طی دهه گذشته آنزیم‌های نوعCTX-M شایع‌ترین نوع بتالاکتامازهای وسیع الطیف را در اروپا، کانادا و آسیا به خود اختصاص داده‌اند. هدف از این مطالعه بررسی میزان فراوانی باکتری‌های کلبسی...
[ 5 ] - تهیه و ارزیابی فیزیکوشیمیایی وزیکول غشاء خارجی نیسریا مننژیتیدیس سروگروه Aبه عنوان کاندیدای واکسن مننگوکوکی
سابقه و هدف: واکسن های پلی ساکاریدی نیسریا مننژیتیدیس سروگروهA به علت ایجاد پاسخهای مستقل از لنفوسیت T دارای معایبی هستند. در نتیجه پژوهش های زیادی برای جایگزین کردن آنها با اجزاء دیگر باکتری انجام شده است که می توان به وزیکول غشاء خارجی ((OMV حاوی PorA اشاره کرد. در پژوهش حاضر، پس از استخراج و ارزیابی بیولوژیکی OMV نیسریامننژیتیدیس سروگروهA ،توان القاء سنتز آنتی بادی بر علیه آن در حیوان آزم...
[ 6 ] - استخراج و ارزیابی مولکولی پروتئین های عمده غشای خارجی بروسلا آبورتوس S99
خلاصه سابقه و هدف: بروسلا باکتری گرم منفی، کوکوباسیل، هوازی، درون سلولی اختیاری، غیرمتحرک و فاقد اسپور می باشد. که طیف گسترده ای از حیوانات و همچنین انسان را آلوده می نماید. امروزه پروتئین های غشای خارجی (OMPs) بروسلا به عنوان ساختارهای ایمونوژنیک جهت طراحی و تولید واکسن زیر واحدی برای پیشگیری از بروسلوزیس انسانی مورد توجه قرار گرفته اند. مواد و روش ها: پروتئین های عمده غشای خارجی از سویه صاف...
[ 7 ] - ارزیابی الگوی سایتوکاینی مدل حیوانی به دنبال ایمیونیزاسیون با کمپلکس لیپو پلی ساکارید بروسلا آبورتوس S99- وزیکول غشاء خارجی نیسریا مننژیتیدیس سروگروه B
زمینه و هدف: پژوهش ها نشان می دهد که لیپوپلی ساکارید ( LPS ) بعنوان مهمترین ساختمان آنتی ژنیکی سویه های صاف بروسلا ،کاندیدای مناسبی برای طراحی واکسن های زیرواحدی است. از طرفی کاربرد ادجوانت های با منشا میکروبی در القاء پاسخهای ایمنی سبب طراحی نسل جدید واکسنهای زیرواحدی شده است که نمونه آن وزیکول غشای خارجی ( Outer Membrane Vesicle: OMV ) نیسریا مننژیتیدس است. وزیکول غشای خارجی باعث افزایش عیا...
[ 8 ] - شناسایی و تشخیص سویه های تهاجمی هموفیلوس آنفلوانزای تایپ b در نمونه های بالینی، به روش واکنش زنجیره ای پلیمراز
Background and purpose: Haemophilus influenzae type b (Hib), is one of the major causes of bacterial meningitis in children younger than five years of age, especially in countries that immunization against Hib is not conducted. In this study we have determined the serotype, encapsulated Haemophilus influenza strains isolated from clinical samples by polymerase chain reaction (PCR) method. Mater...
[ 9 ] - ارزیابی پاسخ آنتی بادی به پروتئین های غشا خارجی بروسلا آبورتوس S99 به روش ELISA
زمینه و اهداف: به پروتئین های غشا خارجی (OMPs) بروسلا به عنوان ساختارهای ایمونوژنیک برای طراحی و تولید واکسن زیر واحد بروسلوز انسانی توجه شده است. OMP های بروسلا آبورتوس همراه با سایر اجزا باکتریایی در خرگوش، سنتز سطوح بالای مولکول های IgG ویژه علیه بروسلا را تحریک می کنند. هدف مطالعه ارزیابی پاسخ آنتی بادی به پروتئین های غشا خارجی بروسلا آبورتوس S99 به روش الیزا بود. روش بررسی: OMP ها از گون...
[ 10 ] - Isolation and characterization of Faecalibacterium prausnitzii extracellular vesicles
Introduction: Extracellular vesicles (EVs) contain active biological compounds which play important roles in biological processes. The secretion of EVs is a common phenomenon which occurs in archaea, bacteria and mammalian cells. The secretion of bacterial EVs has been discovered in various species of both Gram-negative and Gram-positive bacteria. Faecalibacterium prausnitzii is one of the comm...
[ 11 ] - Cloning and expression of porA gene as the first step of a vaccine candidate study against Neisseria meningitidis serogroup A infection
Introduction: Neisseria meningitidis is a major causative agent of bacterial septicemia and meningitis in human. PorA is a major component of the outer membrane of N. meningitidis and functions as a cationic Porin. This study aimed to clone and determine the expression of PorA as the first step for producing a proper antigen in a vaccine study against N. meningitidis. Methods: An approximately ...
[ 12 ] - New insight into the application of outer membrane vesicles of Gram-negative bacteria
This review presents a brief outline of our current knowledge of the structure and chemical composition of the outer membrane vesicles (OMVs), originating from the surface of Gram negative bacteria including their outer membrane proteins and lipopolysaccharides. Moreover, the functional roles and applications of OMVs in medical research such as OMV-based vaccines, OMV adjuvants properties, OMV ...
[ 13 ] - Purification and evaluation of glycerol teichoic acid from biofilm forming Staphylococcus epidermidis as a putative vaccine candidate
Introduction: Biofilm forming Staphylococcus epidermidis is a main causative agent of infections related to medical devices. Purification and evaluation of Gly-TA polysaccharide from a biofilm-forming S. epidermidis as a putative vaccine candidate were the main goals of the current study. Methods: Taking advantage of size exclusion chromatography procedure, glycerol teichoic acid (Gly-TA) was p...
[ 14 ] - Differential protein expression in Mycobacterium tuberculosis susceptible and multidrug resistant isolates
Introduction: Infections by multidrug resistant Mycobacterium tuberculosis (MDR-TB) is a major public health challenge. Secretion of proteins by M. tuberculosis plays an important role in the pathogenesis of the bacterium. We compared the protein profiles of susceptible M. tuberculosis and MDR-TB isolates using proteomic analyses, namely two dimensional gel electrophoresis (2DE) and mass spectr...
[ 15 ] - Protein profiling and analysis of drug sensitive and multidrug resistant isolates of Mycobacterium tuberculosis by native polyacrylamide gel electrophoresis and mass spectrometry
Introduction: Tuberculosis (TB) remains a deadly infectious disease despite all the efforts to reduce its incidence. Spread of multidrug resistant TB has seriously undermined the efforts to control the disease globally. In this study protein expression profile of MDR and sensitive isolates of MTB were analyzed and compared in order to identify proteins, which could be used in prevention, diagno...
[ 16 ] - Molecular analysis of AbOmpA type-1 as immunogenic target for therapeutic interventions against MDR Acinetobacter baumannii infection
Introduction: Acinetobacter baumannii is associated with hospital-acquired infections. Outer membrane protein A of A.baumannii (AbOmpA) is a well-characterized virulence factor which has important roles in pathogenesis of this bacterium. Methods: Based on our PCR-sequencing of ompA gene in the clinical isolates, AbOmpA protein can be categorized into two types, named here type-1 and type-2. We ...
[ 17 ] - Extraction and Purification of Haemophilus influenzae Type b Lipooligosaccharide by Modified Phenol Method
Introduction : Haemophilus influenzae type b (Hib) is a Gram negative bacterium and one of the causative agents of acute bacterial meningitis, especially in infants and children less than 5 years old. Lipooligosaccharide (LOS), one of the virulence factors which plays an important role in pathogenesis of Hib, has multiple applications in diagnosis and conjugate vaccines. In this study, LOS ex...
[ 18 ] - عملکرد و کاربردهای پزشکی وزیکول های خارج سلولی باکتری ها
وزیکول های خارج سلولی، ذراتی در اندازه نانومتری هستند که در حدود پنجاه سال پیش مورد شناسایی قرار گرفتند. از زمانی شناسایی این نانوساختارها مشخص گردید که تقریبا همه باکتری های گرم منفی در طی رشد طبیعی خود وزیکول های خارج سلولی را ترشح میکنند. امروزه تولید وزیکول های غشایی توسط باکتری های گرم مثبت، انگل ها، قارچ ها و مایکوباکتری ها گزارش گردیده است. از آنجایی که این ذرات نانومتری بسیاری ا...
[ 19 ] - In Silico Studies of Outer Membrane of Neisseria Meningitidis PorA: Its Expression and Immunogenic Properties
Neisseria meningitidis is a major causative agent of bacterial septicemia and meningitis in humans. Currently, there are no vaccines to prevent disease caused by strains of N.meningitidis serogroup B. The Class 1 Outer Membrane Protein (OMP) has been named porA which is a cation selective transmembrane protein of 45 KDa that forms trimeric pore in the meningococcal outer membrane. PorA from ser...
[ 20 ] - Worldwide trends in scientific publications on association of gut microbiota with obesity
Objective(s): Recent evidence has shown underlying roles of gut dysbiosis and metabolic endotoxemia in obesity and its complications. Despite the large number of experimental and clinical researches performed on gut microbiota and obesity, no bibliometrics’ study has been conducted so far. We aimed to assess the trend of global scientific publications in the field of gut microbiota and obesity....
[ 21 ] - Cloning, expression, purification and the study of immunotherapy status of TGFαL3-SEB chimeric protein in breast cancer treatment
Background & Aim: Bacterial superantigens, stimulate polyclonal T cells irrespective of their antigen specificity, resulting in a massive release of cytokines from T cells and monocytes, and suggest that that they could be candidates of new antitumor agents. Recent attempts have been done to specifically target superantigens towards tumors. Here, we evaluate TGFαL3-SEB fusion protein as a new a...
[ 22 ] - Molecular Typing of Salmonella paratyphi B and Salmonella paratyphi C Isolates from Clinical Samples in Iran
Background & Objective: Molecular typing is an important tool in surveillance and outbreak investigations of human Salmonella infections. In this study, Subtyping of Salmonella Paratyphi B and C isolates derived from Iranian patients was carried out by RAPD-PCR to assess the extent of genetic diversity of these isolates. Materials & Methods: Fourteen Salmonella isolates including 6 strains of S...
[ 23 ] - Construction and assessment of the immunogenicity and bactericidal activity of fusion protein porin A from Neisseria meningitidis serogroups A and B admixed with OMV adjuvant as a novel vaccine candidate
Objective(s): The porins A and B and also outer membrane vesicles (OMVs) of Neisseria meningitidis are used for vaccine purposes. In the present study, we aimed to design a new vaccine candidate based on a fusion of PorA of serogroups A and B of N. meningitidis admixed with OMV and evaluate it in an animal model.Materials and Methods: Af...
[ 24 ] - Gut Microbiota Composition in Obese and Normal Weight Adults in Iran
Background and purpose: Increasing prevalence of obesity over the past few decades constitutes a global health challenge. Recent evidence suggests that gut microbiota may contribute to weight control. So, the present study aimed at comparing the frequency of different bacteria in gut microbiota between obese and normal weight people in Iran. Materials and methods: Thirty normal weight (BMI of ...
[ 25 ] - Importance of Gut Microbiota and Epigenetic Modifications in Maintaining Health or Diseases
Some organisms may modulate a healthy state or cause disorders by disruption or induction of several signaling pathways in human body. According to recent evaluations, numerous metabolic disorders such as diabetes, obesity, cardiovascular diseases, mental disorders, and cancers are as the result of bacterial interactions with the host. Various species of the bacteria, called commensal microbio...
[ 26 ] - Impact of the Gut Microbiota on Vaccine Responses
Non-responsiveness or poor responsiveness to vaccines are challenging issues in vaccine development, and efforts have been made to find out the potential reasons for these conditions. Intestinal microbiome plays a key role in regulating and development of immune system and the composition and diversity of microbiota in different individuals on the one hand, and the imbalance of intestinal micro...
[ 27 ] - Gut Microbiota and Chronic Hepatitis B and C Viruses-Induced Cirrhosis
Hepatitis B and C viruses are major public health problems. These viruses can chronically lead to liver disease such as fibrosis, cirrhosis, and hepatocellular carcinoma, which often increase mortality in these patients. According to previous studies, the liver is highly affected by changes in the microbiota of gastrointestinal tract and immune system damage caused by inflammation due to viral ...
[ 28 ] - The Role of Intestinal Microbiota in Cognitive Disorders
Cognitive disorders are one of the major public health issues in older population worldwide. Problems in forming and storing new memories, short-term memory impairment, and other cognitive problems are common symptoms of cognitive disorders that have no definite treatment yet. Recent studies have shown an association between gut microbiota and cognitive impairments described as microbiota-gut-...
[ 29 ] - Extracellular Vesicles Derived from Gastrointestinal Microbiota: A New Approach to Clinical Studies
Extracellular vesicles, naturally released from all cell types including bacteria, are of great importance in medical microbiology due to transporting a variety of biomaterials, enzymes, and virulence factors, regulating immunity, and having roles in colonization and initiation of signaling pathways. These vesicles are also secreted from microbiota in the gastrointestinal tract and affect the h...
[ 30 ] - Interaction between Intestinal Microbiota and Serotonin Metabolism
Gut microbiota regulates the production of signaling molecules, such as serotonin or 5-Hydroxytryptamine: 5-HT in the host. Serotonin is a biogenic amine that acts as a neurotransmitter in the gut and brain. There is a perfect interaction between human gastrointestinal microbiota and the serotonin system. The gut microbiota plays an important role in the serotonin signaling pathways through the...
[ 31 ] - Role of Gut Microbiome in Polycystic Ovary Syndrome
Polycystic ovary syndrome (PCOS) is a complex endocrine disorder that affects 8-13% of women at reproductive age worldwide. This disorder is usually associated with menstrual disorders, infertility, obesity, and insulin resistance. The underlying cause of this syndrome is unknown, however in recent years, researchers have shown an association between intestinal microbiota alterations )dysbiosi...
[ 32 ] - Strategies of vaccine production against COVID-19: when will an effective vaccine be produced?
There is a strong consensus globally that production of an effective vaccine against SARS-CoV-2 is likely the most effective approach to sustainably controlling the COVID-19 pandemic. An unprecedented research effort and global coordination has resulted in a rapid development of vaccine candidates and initiation of trials. In this paper, we review vaccine candidate against COVID-19 and also cha...
[ 33 ] - Clinical application of gut microbiota metabolites: A novel opportunity in personalized medicine
Nowadays, metabolomics studies are performed with different approaches to identify biomarkers, clarify the underlying mechanisms of diseases and achieve novel treatment strategies. In this context, gut microbiota-derived metabolites are known as one of the most important mediators of gut microbiota effects on human health and various diseases. Due to the inefficiency of conventional therapies i...
[ 34 ] - Investigating the effect of B. thetaiotaomicron and its derivatives on the expression of tlr2 and tlr4 genes in STC-1 cell line
Background: B. thetaiotaomicron is introduced as a candidate for the next generation of probiotics. TLR2, 4 play an important and necessary role in activating and modulating the innate immune system after exposure to bacteria in the intestine. This study aimed to investigate the effect of B. thetaiotaomicron and its derivatives on the alteration of the tlr2 and tlr4 gene expression. Materials ...
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