Mohammad Reza Khakzad

Islamic Azad University, Teheran, Tehrān, Iran

Are you Mohammad Reza Khakzad?

Claim your profile

Publications (13)9.25 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: The effects of natural adjuvants on lung inflammation and tracheal responsiveness were examined in sensitized guinea pigs.
    Clinics (São Paulo, Brazil) 07/2014; 69(7):491-496. · 1.59 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Anthracofibrosis is the black discoloration of the bronchial mucosa with deformity and obstruction. Association of this disease with tuberculosis (TB) was approved. The objective of this study was to find the additional benefit of assessment of TB by the polymerase chain reaction (PCR) method. Bronchoscopy was performed on 103 subjects (54 anthracofibrosis and 49 control subjects) who required bronchoscopy for their pulmonary problems. According to bronchoscopic findings, participants were classified to anthracofibrosis and nonanthracotic groups. They were examined for TB with traditional methods such as direct smear (Ziehl-Neelsen staining), Löwenstein-Jensen culture, and histopathology and the new method "PCR" for Mycobacterium tuberculosis genome (IS6110). Age, sex, smoking, and clinical findings were not significantly different in the TB and the non-TB groups. Acid-fast bacilli could be detected by a direct smear in 12 (25%) of the anthracofibrosis subjects, and adding the results of culture and histopathology traditional tests indicated TB in 27 (31%) of the cases. Mycobacterium tuberculosis was diagnosed by PCR in 18 (33%) patients, but the difference was not significant. Detection of acid-fast bacilli in control nonanthracosis subjects was significantly lower (3, 6%), but PCR (20, 40%) and accumulation of results from all traditional methods (22, 44%) showed a nonsignificant difference. The PCR method showed a result equal to traditional methods including accumulation of smear, culture, and histopathology.
    Journal of bronchology & interventional pulmonology. 04/2014; 21(2):131-4.
  • Source
  • Source
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Objective: The effects of natural adjuvants were examined on total and differential WBC counts in lung lavage of sensitized guinea pigs. Materials and Methods: In three sensitized groups of guinea pigs including: untreated sensitized animals (S), sensitized animals treated with adjuvant G2 (S+G2) and G2F (S+G2F) as well as non-sensitized group (C) (n=6 for each group), total and differential WBC counts of lung lavage were examined. Sensitization of animals was achieved by injection and inhalation of ovalbumin (OA). Results: The results showed increased total WBC, eosinophil, neutrophil, and basophil counts, and decreased lymphocytes in lung lavage of sensitized animals compared with the control group (p<0.01 for all cases). However, neutrophil, lymphocyte, eosinophil, and basophil counts in lung lavage were decreased in treated groups with either G2 or G2F but total WBC was decreased in lung lavage of treated group with only G2. Conclusion: These results indicate important preventive effects of two natural adjuvants, especially G2, on lung inflammation of sensitized guinea pigs.
    Avicenna Journal of Phytomedicine 01/2013; 3(4):364-70.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Background: Recently, reports have indicated a role for the membrane form of Toll-like Receptor 2 (TLR2) in asthma pathogenesis. In this study we examined soluble TLR2 levels in serum and sputum of asthmatic and healthy subjects. Methods: Serum and sputum samples were obtained from 33 asthmatic and 19 healthy subjects. The asthmatics were classified into four groups according to the Global Initiative for Asthma. A sandwich ELISA was developed to measure soluble TLR2 (sTLR2) in serum and sputum. TLR2 mRNA expression was determined by semi-quantitative RT-PCR of all sputum samples. Results: The mean sTLR2 levels from serum and sputum of asthmatics were significantly lower than healthy subjects. Moreover, sTLR2 concentration decreased concomitantly with asthma severity. The differences observed, however, were not statistically significant. TLR2/GAPDH mRNA of sputum leukocytes was also significantly lower in asthmatics than in healthy subjects. Conclusion: This study demonstrated for the first time that sTLR2 levels are lower in serum and sputum samples from asthmatic than from healthy subjects, and this could be an indicator of TLR2 expression. We also found that sTLR2 concentration in serum decreased concomitantly with an increase of asthma severity clinical score.
    Reports of B iochemistry & Molecular Biology. 10/2012; 1.
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Two new adjuvants from natural animal lipids (G2) and bacterial polysaccharide extracts (PC) were previously prepared by our group and showed a reduction in tracheal responsiveness. The aim of this study was to evaluate the preventive effect of recently introduced natural products (G2 and PC) on the development of asthma. Asthma was induced using a standard method in four groups of BALB/c mice. A non-sensitized control group was also included in order to be compared with treated groups. Three groups were premedicated with novel agents named G2, PC, and a combination of these two for 20 days before starting the induction of asthma. Bronchoalveolar lavage fluid (BALF) was collected and analyzed for inflammatory cells. Interferon-γ, and IL-4 and the histopathological of both lungs were also evaluated. In all pretreated groups, the inflammatory cells infiltration especially eosinophils and smooth muscle hyperplasia decreased significantly. BALF cytology also showed significant decrease in eosinophil count in all pretreated groups. There was a significant increase in the BALF and serum INF-γ in all pretreated groups but the combination of G2/PC was more effective. BALF IL-4 decreased significantly in the group pretreated with a combination of G2 and G2/PC (4.11±0.86 and 4.02±0.52 pg/ml in G2 and G2/PC, respectively). Serum IL-4 in the PC group was significantly higher than the sensitized control. G2 and PC may effectively prevent asthma development by activation of the type 1 T helper system.
    Iranian Journal of Basic Medical Science 01/2012; 15(5):1068-1075. · 0.24 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: C-reactive protein (CRP) is a beneficial diagnostic test for the evaluation of inflammatory response. Extremely low levels of CRP can be detected using high-sensitivity CRP (hs-CRP) test. A considerable body of evidence has demonstrated that inflammatory response has an important role in the pathophysiology of autism. In this study, we evaluated and compared hs-CRP levels between autistic and intellectually normal individuals. Clinical data of 39 autistic and 30 age-matched intellectually normal individuals (control group) were recorded. Patients were divided into two groups (mild-to-moderate and severe) according to childhood autism rating scale. Then serum hs-CRP concentrations were measured and compared between two groups. Also, the correlation between hs-CRP concentration and the severity of autism was determined. The mean concentration of hs-CRP in children with autism (540.1±1125.5ng/ml) was significantly (P
    Research in Autism Spectrum Disorders - RES AUTISM SPECTR DISORD. 01/2012;
  • [Show abstract] [Hide abstract]
    ABSTRACT: Goblet cell hyperplasia (GCH) and mucus hypersecretion in the airway is recognized as an important contributor to morbidity and mortality in asthma and COPD. Verapamil is a calcium channel blocker that binds to the alpha-subunit of L-type calcium channels and inhibits the mucin gene via the calmodulin and CaM kinase pathway. The objective of this study was to determine the in vivo effect of verapamil on GCH and eosinophilic inflammation in sensitized mice. Male BALB/c mice were sensitized to ovalbumin using the standard method. Two groups of animals were received verapamil via an intramuscular injection: 1-low dose (0.5 mg/kg/day for two weeks), 2-high dose (1.5 mg/kg/day for two weeks). Serum and bronchoalveolar lavage fluid (BALF) was collected and analyzed for inflammatory cells, interferon-γ and IL-4. The left lung was sent for histopathological evaluation, especially for periodic acid-Schiff (PAS), to identify goblet cells in the epithelium. The degree of inflammatory cell infiltration, including eosinophils, mucus plugging, and smooth muscle thickness of the airways were classified on a semi quantitative scale. Inflammatory cell infiltration in peribronchial and perivascular areas was observed in all sensitized groups. Eosinophils percentage in the BALF significantly decreased in verapamil-treated mice compared with sensitized mice (from 19.8% in asthmatic to 5.4% for low dose and 4.4% for high dose). The ratio of airway goblet cells per epithelial cells were significantly lower in verapamil-treated mice versus sensitized mice (1.57±1.30% for low dose; 1.50±0.93% for high dose versus 12.93±7.55%, P<0.05, respectively). Mucus production of goblet cells decreased significantly in verapamil-treated mice versus sensitized mice (mean score was 1.45±0.30 for low dose; 0.81±1.00 for high dose versus 2.85±0.86 in the sensitized control group, P<0.05, respectively). The concentration of serum and BALF-IFN-γ in verapamil-treated mice markedly increased by the verapamil treatment when compared to sensitized mice (15.1±0.43 versus 4.7±0.96, P<0.05 and 91.8±47.7 versus 14.8±4.6, P<0.01, respectively). Verapamil is a useful drug with therapeutic targeting on GCH and a potential way to limit mucous production and improve bronchial inflammation.
    Pulmonary Pharmacology &amp Therapeutics 11/2011; 25(2):163-8. · 2.54 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: ETHNOMEDICAL RELEVANCE: The anti-inflammatory activity of both systemic and local administrations of essential oil from Nigella sativa L. has been shown. Therefore, the effect of Nigella sativa on tracheal responsiveness (TR) and lung inflammation of sulfur mustard (SM) exposed guinea pigs was examined. Guinea pigs were exposed to diluent solution (control group), inhaled SM (SME group), SME treated with Nigella sativa (SME+N), SME treated with dexamethasone (SME+D) and SME treated with both drugs (SME+N+D), (n=7 for each group). TR to methacholine, total white blood cell (WBC) and differential WBC count of lung lavage, and serum cytokines were measured 14 days post-exposure. The values of TR, eosinophil, monocyte, lymphocyte, interleukine-4 (IL-4) and interferon gamma (IFN-γ) of SME group were significantly higher than those of controls (p<0.05 to p<0.001). The TR in SME+N, SME+D and SME+N+D was significantly lower compared to that of SME group (p<0.01 for all cases). The percentage of eosinophil in SME+D, and the percentage of monocyte in SME+N+D (p<0.05 to p<0.01) were significantly lower than those in SME group. The neutrophil number was decreased in SME+N and SME+N+D groups compared to SME animals (p<0.05 to p<0.01). IL-4 levels in serum of SME+N (p<0.01), SME+D (p<0.05), SME+N+D (p<0.01) and IFN-γ in SME+N (p<0.05) were greater than those in SME animals. These results showed a preventive effect of Nigella sativa on TR and lung inflammation of SM exposed guinea pigs.
    Journal of ethnopharmacology 09/2011; 137(2):1028-34. · 2.32 Impact Factor
  • Source
    Iranian Journal of Basic Medical Sciences 06/2011;
  • [Show abstract] [Hide abstract]
    ABSTRACT: Pulmonary complications of sulfur mustard (SM) range from mild respiratory symptoms to even severe bronchial stenosis. In the present study, the protective effect of vitamin E on tracheal responsiveness (TR) and lung inflammation of SM-exposed guinea pigs were examined. Guinea pigs were exposed to ethanol (control group), 40 mg/m(3) inhaled SM and ethanol vehicle (sulfur mustard exposed (SME) group), SME treated with vitamin E (SME + E), SME with dexamethasone (SME + D) and both drugs (SME + E + D), (n = 8 for each group). TR to methacholine, total and differential white blood cell (WBC) count of lung lavage and serum cytokines were evaluated 14 days post-exposure. TR, WBC, interleukin 4 (IL-4), interferon gamma (INF-γ), eosinophil, and monocyte levels in SME guinea pigs were significantly higher, but lymphocyte was lower than those of controls (P < 0.05 to P < 0.001). TR, IL-4, and eosinophil levels in SME + E, SME + D and SME + E + D, INF-γ in SME + E and SME + E + D and WBC in SME + E were significantly decreased compared to that of the SME group (P < 0.01 to P < 0.001). In addition, the TR of SME + D + E was significantly higher than that of SME + E (P < 0.01) and SME + D (P < 0.05) groups. The results showed a preventive effect of vitamin E, dexamethasone and their combination on TR and lung inflammation in SME guinea pigs.
    Inhalation Toxicology 02/2011; 23(3):157-65. · 1.89 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Spirometry has been used as a common diagnostic test in asthma. Most of the patients with a mild asthma have a FEV1 within normal range. Hence, other diagnostic methods are usually used. The aim of this study was to evaluate whether eosinophil Cationic Protein (ECP) could be an accurate diagnostic marker of mild asthma. In this study diagnosis of asthma was made according to internationally accepted criteria. Asthma severity was evaluated according to frequency of symptoms and FEV1.Adequate sputum samples were obtained in 50 untreated subjects. A control group of 12 normal subjects that showed PC20 more than 8 mg/dl was also examined. Sputum was induced by inhalation of hypertonic saline. Inflammatory cells in sputum smears were assessed semi-quantitatively. ECP and IgE concentrations, eosinophil (EO) percentage and ECP/EO ratio in serum and sputum were also determined. The results revealed that Cough and dyspnea were the most frequent clinical findings. Dyspnea and wheezing were the symptoms that correlated with staging of asthma. FEV1 was within normal range (more than 80% of predicted) in 22 (44%) subjects.Asthmatic patients showed significantly higher numbers of blood eosinophils (4.5+/- 3.1% vs. 1.2+/-0.2%, P=0.009), and higher levels of serum ECP than control group (3.1+/- 2.6 % and 22.6+/- 15.8 ng/ml, respectively). Sputum ECP level in asthmatics was significantly higher than non- asthmatics (55.3+/-29.8ng/mL vs. 25.0+/-24.7ng/mL, P=0.045). Regression analysis showed no significant correlation between spirometric parameters and biomarkers, the only exception was significant correlation between FEF(25-75) and serum ECP (r= 0.28, P 0.041). Regarding clinical symptoms, wheezing was significantly correlated with elevation of most of biomarkers. Since, serum and sputum ECP levels are elevated in untreated asthmatics, the ECP level could be used for accurate diagnosis of mild form of asthma in which spirometry is unremarkable.
    Iranian journal of allergy, asthma, and immunology 09/2009; 8(3):155-60. · 0.65 Impact Factor

Publication Stats

5 Citations
9.25 Total Impact Points

Institutions

  • 2011–2014
    • Islamic Azad University
      Teheran, Tehrān, Iran
  • 2011–2013
    • Mashhad University of Medical Sciences
      • • Lung Disease & TB Research Center
      • • Department of Physiology
      Mashad, Razavi Khorasan, Iran
  • 2009–2011
    • Islamic Azad University Mashhad Branch
      Mashad, Razavi Khorasan, Iran