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Showing 41 results for Resistance
Parvin Babaei, Arsalsn Damirchi, Ameneh Pourrahim Ghouroughchi , Volume 16, Issue 2 (7-2016)
Abstract
Background & objectives: Estrogen reduction after the menopause is associated with visceral adipose tissue accumulation and insulin resistance. Serum omentin-1 level is also decreased by abdominal obesity and insulin resistance. This study investigated the effect of estrogen on visceral fat, omentin-1 and insulin resistance in ovariectomized (OVX) rats.
Methods: Thirty 13-week-old female Wistar rats weighing180±5 gr were randomly matched on their body weight and divided into OVX (n=20) and sham-operated (SHAM; n=10) groups. OVX rats were subdivided into estrogen replacement therapy (Ovx+Est; n=10), and control (Ovx+sesame Oil; n=10) groups. The estrogen replacement therapy received 17b-estradiol (30µg/kg bw; in 0.2 ml sesame oil) three days a week, for eight weeks. Ovx+Oil received the same sesame oil subcutaneously as vehicle. All intra-abdominal fat depots were dissected out and weighed immediately. Omentin-1 concentration was measured by rat omentin ELISA kit and HOMA-IR was used to estimate the insulin resistance. Obtained data were analyzed by ANOVA and post hoc Tukey test.
Results: Visceral fat was decreased by 12.84% in Ovx+Est compared to Ovx+Oil group; but it wasn ́t significant. Whereas, body weight was significantly decreased by 7.87 % in Ovx+Est compared to Ovx+Oil; and it was significantly increased by 12.5% in Ovx+Oil compared to SHAM group. Omentin-1 level was significantly increased by 41% in Ovx+Est compared to Ovx+Oil group; whereas it was significantly decreased by 13.9% in Ovx+Oil compared to SHAM group. The levels of glucose, insulin and HOMA-IR were significantly decreased to 51.16%, 24.23% and 61.52%, respectively, in Ovx+Est group compared to the rats in Ovx+Oil group (p=0.0001).
Conclusion: 8-week estrogen reduces body weight and improves insulin resistance probably via increase in omentin-1.
Shadi Shahsavan, Abdolaziz Rastegar Lari , Bita Bakhshi, Parviz Owlia, Maliheh Nobakht , Volume 16, Issue 3 (10-2016)
Abstract
Background & objectives: Shigella spp. are gram negative bacteria that can cause shigellosis in human. It is important in young children as well as elderly and immunocompromised people. Threatening complications can occur in severe cases with multidrug resistance species. It has been observed that Shigella spp. have become resistant to antibiotics like other bacteria. Investigation of resistance to azithromycin, tetracycline and pattern of resistance are the objectives of this study.
Methods: Fifty isolates of Shigella spp. which have been collected from three hospitals in Tehran were studied. Isolates identified and confirmed as Shigella spp. by biochemical, serological and molecular methods (ipaH, wbgz, rfc genes). Antimicrobial susceptibility test was performed for ampicillin, azithromycin, ciprofloxacin, doxycycline, levofloxacin, minocycline, nalidixic acid, norfloxacin, streptomycin, trimethoprim-sulfamethoxazole and tetracycline by disc agar diffusion method. Minimal inhibition concentrations were performed for azithromycin and tetracycline.
Results: From a total of 50 Shigella spp. isolates, 16% of them were Shigella flexneri and 84% Shigella sonnei. The majority of isolates were multidrug resistant. The most resistance was seen to doxycycline, streptomycin, trimethoprim-sulfamethoxazole and tetracycline. Resistance to azithromycin was 6% and all of the isolates were susceptible to norfloxacin and levofloxacin. Nine patterns of resistance were revealed to these isolates.
Conclusion: High resistance to tetracycline was observed and resistance to azithromycin as an alternative treatment choice was also considerable.
Hosseini Fatemeh, Mohammad Kargar, Volume 17, Issue 2 (7-2017)
Abstract
Background & objectives: Enterococcus spp. are predominant in the faecal microflora which enter the environment directly or through wastewater. These bacteria play an important role in the development of nosocomial infections due to their ability to acquire resistance genes and their transmission to other bacteria, particularly Staphylococcus aureus. The aim of this study was to identify the prevalence of vancomycin-resistant enterococci (VRE) and to detect van A, van B and van C1/C2 genes in VRE strain isolated from environmental samples of the in southern Fars province.
Methods: This cross-sectional study was carried out on 155 Enterococcus spp isolates collected from environmental samples (hospital wastewaters and surface waters) in different areas of Larestan and Jahrom cities. Isolates were identified and confirmed as Enterococcus spp. using the membrane filtration method, selective growth on Kenner Fecal Streptococcus Agar (KF) medium and biochemical tests. The disk diffusion test and Macro Broth dilution method based on CLSI guidelines were used to determine antimicrobial susceptibility against conventional antibiotics and vancomycin and to measure the minimum inhibitory concentration (MIC), respectively. Finally, the presence of van A, van B and van C1/C2 genes in VRE strains was determined by multiplex PCR technique.
Results: Out of all of Enterococcus spp. isolates, 41 cases (26.45%) were belonged to E.faecalis, 6 cases (3.87%) to E.faecium and 108 cases (69.68%) to non-faecalis and non-faecium. In total, 46 isolates (29.67%) were resistant to vancomycin and 4 isolates showed MIC ≥128 μg/ml. Resistant to all types of antibiotics was observed in 4 isolates (8.70%). Further, 2 isolates (50%) had vanA gene and 2 isolates (50%) had vanB gene, but vanC1/C2 genes were detected in none of them.
Conclusion: The results indicated that the VRE strains are widespread in the studied area, therefore there is an urgent need for prudent use of vancomycin and implementation of control measures to prevent the environmental spread of VRE strains.
Hoosna Sarvazad, Mojtaba Darbouy, Volume 17, Issue 3 (10-2017)
Abstract
Background & objectives: One of the main problems in the control of nosocomial infections due to Klebsiella pneumoniae is increase of antimicrobial resistance and prevalence of extended spectrum β-lactamase (ESBLs) producing isolates. The aim of this study was to investigate the correlation of antibiotics resistance with SHV, CTX-M and TEM extended-spectrum beta lactamases genes among Klebsiella pneumoniae isolates isolated from the patients in Kermanshah hospital.
Methods: The clinical isolates of Klebsiella pneumoniae were collected during the spring from Kermanshah hospitals, and identification of Klebsiella pneumoniae strains was performed using standard microbiological and biochemical tests. Antibiotic resistance of Klebsiella pneumoniae isolates was determined using disk diffusion method. Then, the presence of CTX-M, SHV, and TEM was investigated using multiplex-PCR method. Finally, the relationship between variables was analyzed by SPSS-22 software using logistic regression and chi-square.
Results: A total of 98 isolates out of 112 samples were identified as Klebsiella pneumonia. Also, 82.8% of isolates were resistant to cefotaxime, 40.2% to ceftriaxone, 62.88% to ceftazidime, 3.9% to imipenem, 39.17% to cefepime, 64.94% to cefixime and 26.8% to amikacin. Further, 35.55% of isolates had CTX-M gene, 63.91% of isolates had SHV gene and 9.27% of samples had TEM gene.
Conclusion: The presence of CTX-M, SHV and TEM genes along with high antibiotic resistance are very concerning, indicating the importance of rational use of antibiotic for the treatment of infectious diseases.
Ali Abdi, Nasrin Ramezani , Mehdi Amini , Volume 18, Issue 1 (4-2018)
Abstract
Background & objectives: Irisin is a novel myokine that encoded by FNDC5 gene and effects on obesity, metabolism and glucose homeostasis through browning of white adipose tissue and thermogenesis. The main purpose of this study was to investigate the changes of FNDC5 gene expression and Irisin protein level of visceral fat tissue after eight weeks of resistance training in type 2 diabetic rats.
Methods: Eighteen male Wistar rats (8 week old) were used for this study. Diabetes was induced using nicotinamide and streptozotocin . Five days after inducing diabetes, rats with fasting blood glucose levels between 127-600 mg / dl were selected as diabetic subjects. Rats were homogenized according to the body weight and assigned into two groups including control-diabetes (n=9) and resistance training-diabetes (n=9). Training group exercised resistance training for eight weeks (5 days a week). The resistance training protocol consisted of climbing a one-meter- high ladder, with a weight attached to a tail sleeve. Quantitative Real time RT-PCR and ELISA Kit were used for assessment of expression level of FNDC5 gene and Irisin protein, respectively. Data were analyzed using independent t- test at p≤0.05.
Results: Resistance training significantly increased the expression level of FNDC5 gene and Irisin protein in visceral adipose tissue in type 2 diabetic rats.
Conclusion: It seems that FNDC5 gene and Irisin protein have an important role in metabolic diseases and can be affected by resistance training. Perhaps the changes in the levels of these metabolic indicators is a potential new target for the treatment of metabolic disorders, such as T2DM (type 2 diabetes).
Atefe Sarafan Sadeghi , Najmeh Ansari, Farzad Khademi, Reza Mir Nejad , Behnam Zamanzad , Volume 19, Issue 1 (4-2019)
Abstract
Background & objectives: In recent years, Acinetobacter baumannii has been shown to be associated with several nosocomial infections, including pneumonia, bacteraemia, urinary tract infections, wound infection and meningitis. This organism can survive in the hospital environment and rapidly develops resistance to many antibiotics. The molecular genotyping can increase our knowledge about the spread of A. baumannii strains from one hospital to another and their drug resistance. Therefore, this study aimed to determine the prevalence of antibiotic resistance profile as well as phylogenetic relationships of A. baumannii strains in Shahrekord teaching hospitals.
Methods: In this study, antibacterial susceptibility patterns of A. baumannii strains isolated from different clinical specimens (urine, blood, sputum) to amikacin, ampicillin/sulbactam, aztreonam, cefepime, ceftazidime, ciprofloxacin, gentamycin, imipenem, meropenem, norfloxacin, ofloxacin, piperacillin/tazobactam, tobramycin were tested using disk diffusion )Kirby-Bauer( method. Finally, genotyping of A. baumannii strains was performed using REP-PCR method.
Results: During this study, 50 samples of patients were identified as A. baumannii) 71%(, and their drug resistance rates were assessed. All A. baumannii strains were resistant to ceftazidime and cefepime and also a high rate of resistance to aztreonam, norfloxacin, ciprofloxacin, amikacin, imipenem, gentamycin, and ampicillin-sulbactam were observed. On the other hand, our results demonstrated nine genotype groups among A. baumannii strains based on REP-PCR method.
Conclusion: Due to the high prevalence of antibiotic resistance among isolated A. baumannii strains, similarities between different genotypes and the dispersion of these genotypes in different parts of Shahrekord hospitals, the implementation of infection control programs in different parts of the hospital is necessary.
Roghieh Saboorian, Mohammad Rahbar, Marjan Rahnamaye Farzami , Parvaneh Saffarian, Volume 19, Issue 2 (7-2019)
Abstract
Background & objectives: Antibiotic resistance in Vibrio cholerae is a crucial matter in the world. Objective of this study was the improvement of cholera surveillance by assessing the antimicrobial resistance pattern and bacterial resistance genes in V. cholerae O1 isolates, reffered to Iranian Reference Health Laboratory, in cholera outbreaks during 2012- 2015.
Methods: This study is a cross sectional- descriptive research. Antimicrobial susceptibility test (AST) to 8 antibiotics was performed on 113 V.cholerae O1 isolates using E-test method. For all isolates, conventional PCR method was used to detect the presence of tetracycline resistance genes (tetA, tetB and tetC) and the sulfamethoxazole-trimethoprim resistance genes (sul2 and dfrA1).
Results: All isolates were sensitive to ampicillin, temocillin, ciprofloxacin and cefixime and 64% of strains showed intermediate susceptibility to erythromycin. The resistance rate of nalidixic acid, sulfamethoxazole-trimethoprim and tetracycline were 90%, 71% and 50% respectively. However, the frequency of multidrug resistant (MDR) strains varied across the years. The frequency of resistance genes (tetA, tetB, tetC, sul2 and dfrA1) were 70%, 34%, 58%, 66% and 70% respectively.
Conclusion: AST should be used to determine the resistance profile at the beginning of a cholera outbreak and to monitor the resistance profile of circulating strains as part of surveillance of the disease. A prominent association was observed between phenotypic resistance to sulfamethoxazole-trimethoprim and presence of dfrA1gene. Determining the presence of resistance genes is necessary for understanding the epidemiology and routes of transmission of antibiotic resistance genes
Lida Jalali Dizage, Mohammad Reza Nahaei, Javid Sadegi, Volume 19, Issue 3 (10-2019)
Abstract
Background & objectives: Urinary tract infection (UTI) is one of the most common types of human infections and Escherichia coli and Klebsiella pneumonia are the main causes of urinary tract infection among the gram negative bacteria. The prevalence of extended-spectrum β-lactamases (ESBLs) among these bacteria and hence resistant strains to β-lactam antibiotics have increased in recent decades. Several types of extended-spectrum β-lactamases, such as TEM, SHV and CTX-M have been identified, which are prominently present in the strains of E. coli and K. pneumoniae. The objective of this study was to determine the prevalence of TEM and SHV genes in E. coli and K. pneumoniae isolates of urinary tract infections by using phenotypic and molecular (PCR) techniques in microbiology laboratory at medical school of Tabriz Islamic Azad University.
Methods: In this cross-sectional descriptive study, 50 isolates of E. coli and 50 isolates of K. pneumoniae collected from urinary tract infections from out-patients in Tabriz. Antibiotic sensitivity patterns of isolates were studied against 14 antibiotics by disk diffusion test (Kirby Bauer) and also confirmatory tests were performed using combined antibiotic tests. Finally TEM and SHV genes were investigated using molecular methods (PCR).
Results: Twenty five isolates (25%) out of 100 bacterial isolates were identified as ESBL-producing isolates of which 13 isolates (26%) were E. coli and 12 isolates (24%) were K. pneumoniae. The TEM and SHV genes were detected in 2% and 4% of E.coli and 0% and 2% of K. pneumoniae isolates, respectively.
Conclusion: The presence of these genes among our isolates confirmed ESBL genes in these medically important bacteria leading to resistance against β-lactam antibiotics which are routinely used in their treatments. The low frequency of the studied genes could be because of the source of our isolates from out-patients which are not generally exposed to antibiotics
Sanaz Habibi, Roya Safarkar, Vahid Rouhi, Volume 19, Issue 4 (1-2019)
Abstract
Background & objectives: Methicillin-resistant Staphylococcus aureus is one of the most common causes of nosocomial infections. The polysaccharide adhesion mechanism encoded by the ica operon generates a direct role in biofilm formation and infection of the bacteria. The aim of this study was to evaluate the frequency of icaA gene in Staphylococcus aureus isolates isolated from clinical specimens of patients admitted to some clinical centers of Rasht.
Methods: This descriptive, cross-sectional study was performed on 100 Staphylococcus aureus isolates from some clinical centers of Rasht in 2019 and confirmatory tests were performed to identify the bacteria. icaA gene identification and its frequency were investigated using molecular methods . The antibiotic resistance pattern against 10 antibiotics and biofilm-forming ability of the isolates were determined using the disk diffusion method and Congo red method respectively.
Results: In the present study, among the 100 studied isolates, the highest drug resistance was related to penicillin, and the lowest antibiotic resistance was belonged to ciprofloxacin. 81 isolates (81%) were resistant to methicillin and 37 isolates (37%) had multiple resistance. Of 37 isolates with multiple resistances, 32 isolates (86.48%) had icaA gene and 24 isolates (64.9%) ،had the ability to produce strong biofilms.
Conclusion: According to the findings of this study, the prevalence of Staphylococcus aureus isolates carrying icaA gene with strong biofilm forming ability and resistance to methicillin, were high. This necessitates the need for serious management of antibiotic administration.
Seyed Ali Bazghandi , Somayeh Safarirad, Mohsen Arzanlou, Hadi Peeri-Dogaheh , Hossein Ali-Mohammadi , Farzad Khademi, Volume 20, Issue 2 (7-2020)
Abstract
Background & objectives: Bacterial antibiotic resistance is becoming a global health crisis. The aim of this descriptive, cross-sectional study was to investigate the prevalence of multidrug-resistant Pseudomonas aeruginosa strains in Ardabil.
Methods: During 9 months, between July 2019 and March 2020, 50 strains of Pseudomonas aeruginosa were collected from different clinical specimens in four hospitals of Ardabil and the prevalence of MDR, XDR and PDR strains of Pseudomonas aeruginosa were evaluated. Antibiotic susceptibility testing was assessed using the disk diffusion method.
Results: In the present study, the prevalence of MDR, XDR and PDR strains of Pseudomonas aeruginosa were 52%, 40% and 14%, respectively.
Conclusion: Due to high prevalence of multidrug-resistant strains of Pseudomonas aeruginosa in Ardabil, continuous monitoring of the antibiotic resistance trend in clinical isolates in order to select the best medication is necessary.
Esmaeil Akbari, Saqqa Farajtabar Behrestaq , Babisan Askari, Volume 20, Issue 3 (10-2020)
Abstract
Background & objectives: Foxo1 is a transcription factor in insulin signaling in the liver. The function of Foxo1 is important in the ability of insulin to regulate hepatic glucose production and glucose homeostasis. The aim of this study was to determine the effect of resistance training program on Foxo1 expression in liver cells as well as glucose and insulin serum levels in male Wistar rats with type 2 diabetes.
Methods: The statistical population of this experimental study was 10-weeks old, male Wistar rats weighing 220±20 g (n=14). The studied rats were subjected to 6 weeks of high-fat diet and STZ injection for type 2 diabetes induction and then rats were randomly divided into two groups (control and resistance). The training group participated in a resistance training course for 6 weeks, 5 sessions per week, in the form of 4 sets and 5 repetitions per set, climbing a 26-step ladder to a height of one meter with a vertical slope of 80%. Finally, 48 hours after the last training session, fasting blood glucose and insulin levels as well as Foxo1 expression level in liver cells of both groups were measured and compared by independent t-test (a=%5).
Results: The resistance training improved fasting blood glucose compared to control subjects (p>0.001). the serum insulin levels were significantly increased (p=0.042) and Foxo1 expression significantly decreased in resistance group when compared with control subjects (p=0.023).
Conclusion: Based on these data, the decrease in glucose concentration in the exercise group can probably be attributed to the decreased expression of Foxo1 in hepatocyte cells in response to resistance training.
Ali Ahmadzadeh, Ameneh Pourrahim Ghouroghchi, Roghayeh Afroundeh, Volume 20, Issue 4 (1-2021)
Abstract
Background & objectives: Minimizing muscle damage and inflammation can boost the immune system and improve sport performance. The aim of this study was to investigate the effect of 8 weeks of resistance training-cold water immersion and curcumin supplementation on muscle injury and inflammation following a session of acute strength activity in futsal players men.
Methods: twenty futsalist volunteered to participate in the study and were randomly assigned to experimental and control groups. Blood sampling was performed after 12 hours of night fasting during four stages. After the first phase of blood sampling, both groups were performed one session of acute circular strength training, then, the second phase blood sampling was performed. 48 hours later, the experimental group performed 8 weeks of circular resistance training, three sessions per week as in the acute strength training and were immersed immediately after exercise, 20minutes at 5-10°C in cold water and used 150mg curcumin supplementation. forty eight hours after the last training session and last using curcumin, blood sampling was performed in both groups. Then, both experimental and control groups performed the second acute circular strength training and the fourth stage blood sampling was performed. The differences of variables at different time intervals were compared with 2×4 two-way ANOVA and differences between the two groups were investigated with Independent-Samples T-Test at significance level of p<0.05.
Results: Creatine kinase and white blood cells significantly increased in both groups after the first acute strength activity (p=0.049). Performing 8 weeks of resistance training-cold water immersion and curcumin supplementation, significantly decreased creatine kinase and white blood cell counts (p=0.024). Also, 8 weeks of resistance training-cold water immersion and curcumin supplementation, significantly reduced creatine kinase and white blood cells following acute second strength activity (p=0.021).
Conclusion: Appears to, 8-week resistance training-cold water immersion and curcumin supplementation following a session of acute strength training reduce muscle injury and inflammation in futsal players men.
Alireza Shiroyeh, Farshad Emami, Mohammad Sanaee, Rasol Tarighi, Volume 20, Issue 4 (1-2021)
Abstract
Background & objectives: Preptin and adropine are peptide hormones that play an important role in the controlling of obesity by regulation of carbohydrate metabolism. The purpose of the present study was to investigate the effect of aerobic training on preptin, adropine and insulin resistance in men with overweight.
Methods: In this clinical trial study, 18 overweight and obese men (age 58.39±3.92, body mass index 28.75±1.23) were selected and randomly divided into two groups (control and exercise). Exercise group participated in an aerobic exercise program for eight weeks, five sessions per week (with an intensity of 65 to 85% of maximum heart rate, 40 minutes). Two days before and after the protocol, fasting blood samples were taken. Preptin and adropine were measured by ELISA. Data were tested using independent t-test and ANCOVA at a significance level of p<0.05.
Results: The level of preptin in the experimental group was significantly reduced compared to the control group (p=0.001) and the pretest (p=0.000). Also, the adropine level in the experimental group increased significantly compared to the control group (p=0.000) and the pretest (p=0.000). Also, Homeostatic Model Assessment for Insulin Resistance (HOMA-IR) values in the exercise group compared to the control group (p=0.000) and pretest (p=0.000) showed a significant decrease.
Conclusions: Exercise improved glycemic index in obese and overweight men by improving the levels of preptin and adropine. It seems that aerobic exercise can be an effective intervention method to control and prevent the occurrence of metabolic diseases in these people.
Khadijeh Hamidian, Elyas Abdollahi, Zahra Yazdanpour, Laleh Shahrakimojahed, Farzad Khademi, Hamid Vaez, Volume 21, Issue 1 (4-2021)
Abstract
Background and objectives: Urinary tract infection (UTI) is the most prevalent infection and Escherichia coli (E. coli) is one of the main causes of UTI worldwide. Integrons are mobile genetic elements considered to be responsible for dissemination of multi-drug resistance infections. Therefore, the aims of this study were to investigate the antibiotic resistance patterns and distribution of class I, II and III integrons among E. coli isolated from patients.
Methods: In this descriptive cross-sectional study, from Jun 2020 to March 2021, in total, 70 non-duplicate strains of E. coli were isolated from patients with UTI referred to Amiralmomenin hospital, Zabol, Iran. Antibiotic resistance patterns were determined using Kirby-Bauer’s disk diffusion method and Clinical and Laboratory Standards Institute (CLSI) guidelines. Class I, II and III integrons were detected using polymerase chain reaction (PCR).
Results: The isolates showed high resistance toward ampicillin (77.1%), trimethoprim- sulfamethoxazole (58.5%) and ceftriaxone (35%), whereas were mostly susceptible to meropenem (97%). Based on results of PCR, 34 (48.6%) and 3 (4.3%) isolates were classified as class I and class II integron-positive strains, respectively.
Conclusion: Resistance rate to ampicillin, ceftriaxone and trimethoprim-sulfamethoxazole was at a high level and their prescription should be restricted. Class I integron is widely distributed among E. coli isolates and play a crucial role in the emergence of antibiotic resistance
Abbas Mousavi, Allahyar Arabmomeni, Volume 21, Issue 2 (7-2021)
Abstract
Background & objectives: Flat foot is one of the most common physical and motor disorders among students. The aim of this study was to investigate the effects of three comprehensive corrective exercise protocols on the correction of flexible flat foot in boy students with overweight.
Methods: In this quasi-experimental study, which was performed as a pre-test, post-test with a control group, a total of 80 overweight students with flexible flat foot were selected purposefully and divided into four equal groups (n=20) randomly; (Theraband exercise, NASM, water resistance training and a control group). The experimental groups performed correction exercises for 8 weeks, 3 sessions with 45 minutes per week. Variables were measured at the baseline and after 8 weeks of correctional program. Data were analyzed using analysis of covariance by SPSS 24 software at the significance level of p<0.05.
Results: The results of the study showed that the three protocols; Theraband exercise, NASM and water resistance training had a significant effect on the improvement of flexible flat feet in overweight male students with coefficients of 0.23, 0.32 and 0.15, respectively (p≤0.05). Furthermore, it was observed a significant difference between of these three corrective protocols on flexible flat foot.
Conclusion: These findings indicated that the three correction exercises have a significant effect on the improvement of flexible flat feet. Therefore, it is recommended trainers of rehabilitation centers and corrective movements use these training methods.
Hamideh Montazery Taleghani, Nader Shakeri, Khosro Ebrahim, Rahman Soori, Mandana Gholami, Volume 22, Issue 2 (7-2022)
Abstract
Background & objective: Diabetes causes chronic problems in the structure and function of tissues, such as apoptosis and fibrosis in addition to glycemic disorders. In this study the effect of 8 weeks of endurance and resistance training on various signaling pathways of apoptosis and tissue fibrosis of the heart of diabetic rats was investigated.
Methods: Thirty Wistar rats, approximately 8-10 weeks old, weight about 210-250 grams, received intraperitoneal injection of diabetic streptozotocin and were randomly divided into three groups: endurance training, resistance training and control group. The rats of the endurance training group were trained on the treadmill for 8 weeks, 5 days a week with intensity of vo2Max 60-80%. The resistance training group was trained on the ladder with a slope of 85 degrees and with a weight equals to 30-100% of their body weight. Forty eight hours after the last training session, blood samples were collected and ventricular tissues of mice were extracted. Glucose, insulin, serum insulin resistance index and Bcl-2, Bax, caspase 8 gene expression levels and Bax to Bcl-2 ratio were evaluated. Masson's trichrome and hematoxylin-eosin staining methods were used for histological examination of diabetic rat's heart structure to detect fibrosis.
Results: There was a significant decrease in Bax gene expression and the ratio of Bax to Bcl-2, and also there was a significant increase in Bcl-2 and caspase 8 in the endurance and resistance training groups in comparison with the control group. The rate of cardiomyocyte fiber rupture in the endurance and resistance groups was less than the control group, and the presence of lymphocyte cells was observed in some fibers in the control group. (p≤0.05).
Conclusion: The results showed that high-intensity resistance training and moderate-intensity endurance training can prevent tissue fibrosis caused by collagen deposition in diabetes, and these two types of training can reduce the factors involved in apoptosis both in the internal and external pathways. On the other hand, this training intensity can be used as an effective non-pharmacological method to reduce the problems of apoptosis and fibrosis caused by diabetes in the heart tissue.
Sajjad Kermani, Asieh Abbassi Daloii, Ahmad Abdi, Ayoub Saeidi, Volume 22, Issue 3 (10-2022)
Abstract
Background & objectives: Recent evidence suggests that bone morphogenetic proteins (BMPs) are involved in regulating of adipose tissue. This study aimed to evaluate the effect of three resistance training methods on bone morphogenetic protein 2 and lipid profile in obese men.
Methods: In a semi-experimental trial, 44 obese men (23-32 years) were selected and randomly divided into four groups, including control, interval resistance training, traditional resistance training and circuit resistance training. Interval, traditional and circuit resistance training performed with an intensity of 50% of maximum repetition and active rest, 3-time sessions per week for 12 weeks. Serum BMP-2 levels were measured using an ELISA kit. Data were analyzed using paired t-test, one-way analysis of variance and Tukey post hoc test at the p<0.05.
Results: The results showed that interval, traditional and circuit resistance training were associated with a significant decrease in bone morphogenetic protein 2 (BMP-2), LDL, cholesterol and triglyceride concentrations in interval, traditional and circuit resistance training groups, and also a significant increase in HDL concentration in interval and circuit resistance training groups in comparison with the pretest (p<0.001). BMP-2 levels were significantly lower in the interval resistance training group than in the traditional resistance training group (p<0.001). The HDL and LDL, cholesterol and triglycerides levels in obese men in the interval and circuit resistance training groups were significantly higher and lower than in the interval resistance training group, respectively (p<0.001).
Conclusion: 12 weeks of the interval, circuit and traditional resistance training were associated with decreased BMP-2 and improved lipid profile in obese men, and interval resistance training may be more effective on BMP-2 and lipid profile in obese men.
Elahe Faramarzi, Parvaneh Nazarali, Volume 22, Issue 3 (10-2022)
Abstract
Background & objectives: Adipolin is one of the anti-inflammatory adipocytokines that is mainly synthesized and secreted in adipose tissue. This study aimed to compare the two types of Pilates and CX exercises on adipolin level and insulin resistance in overweight women.
Methods: In this semi-experimental research, 30 overweight female subjects (age range 20-40, BMI, 25-30 kg/m2) were divided into three groups of Pilates (10 people), CX (10 people) and control (10 people) .The Pilates group trained with an intensity of 50-80% of the maximum heart rate (8 weeks, three sessions per week, for 60 minutes) and the CX group with an intensity of 50-80% of 1RM (8 weeks, three sessions per week, for 30 minutes). The control group did not do any sports activities. Before and after the intervention, measurements of the subjects' height, weight and body mass index and heart rate were taken using a polar wristwatch, and blood samples were taken from the subjects to check the biochemical factors of adipolin, insulin and glucose. In order to determine the difference between the groups, a mixed statistical test was used. ANOVA and paired statistical tests were used to determine the simple effects of variables.
Results: The results of the present study showed that the implementation of 8 weeks of Pilates and CX exercises increases plasma adipolin level, which was statistically significant (p<0.05). Also, there was a significant difference between the two sports activities of Pilates and CX with the control group (p<0.05); However, there was no significant difference in any of the factors between the Pilates and CX groups. Weight indices, fat percentage, BMI, glucose, insulin and insulin resistance of Pilates and CX groups have significantly decreased compared to the control group (p<0.05).
Conclusion: Based on the results of our study, it was shown that Pilates and CX exercises cause a significant increase in the serum level of adipolin and a significant decrease in body mass index, fat percentage, weight and insulin resistance compared to the control group (p<0.05), but there was no significant change in these factors between the two groups of Pilates and CX.
Mansooreh Shamsi Soshab, Alireza Elmieh, Ramin Shabani, Volume 22, Issue 3 (10-2022)
Abstract
Background & objectives: Parkinson's disease is a progressive neurological disorder associated with the destruction of dopaminergic neurons in the substantia nigra. Physical exercise can control the risk of neuronal damage. The compounds of olive oil have a modulating effect on the activity of the brain cholinergic system. The present study aimed to investigate 8 weeks of combined aerobic resistance training with olive oil consumption on the balance and some apoptotic genes of the substantia nigra of the brain in Parkinsonian rats.
Methods: Forty- eight male rats were divided into 8 groups (n=6). 6-Hydroxydopamine was used to induce Parkinson's disease. Olive oil (0.4ml/daily) was fed for 8 weeks to the target group. Thirty minutes aerobic exercise was performed on a treadmill at a speed of 11 meters per minute with an intensity of 60 to 65% of VO2max. Resistance exercise started by climbing a ladder with weights to the rat's tail with 30% of body weight, which reached 100% of body weight at the end of the eighth week. To check the balance of the mice, a balance bar was used; the expression level of genes was measured using Real time-PCR method. Statistical analysis was performed using one-way analysis of variance and Thomhan's post hoc test at a significance level of p<0.05.
Results: A significant increase in PINK-1and AKT gene expression levels and a decrease in caspase-3 and p53 gene expression levels were observed in the exercising group, exercising with and without consuming olive oil and corn oil compared to the Parkinson's group (p=0.001). However, there was no significant difference between these three groups (p>0.05). Balance improvement was observed in rats with exercise and olive oil consumption compared to the parkinsonian group (p=0.001).
Conclusion: 8 weeks of combined resistance-aerobic training causes a significant increase in the expression level of AKT and PINK1 genes and a decrease in the expression level of caspase-3 and P53 genes in Parkinsonian rats. Also, this type of exercise, along with the consumption of olive oil improves balance in Parkinsonian rats.
Maryam Nazari, Nilofar Saeli, Mohsen Arzanlou, Saghar Jafari-Ramedani, Hafez Mirzanejad-Asl, Farzad Khademi, Aida Alinezhad, Volume 24, Issue 1 (4-2024)
Abstract
Background: Antibiotic resistance represents a critical global concern within the medical community, posing significant challenges in the treatment of infections caused by drug-resistant pathogens. Over the years, broad-spectrum fluoroquinolones have been extensively used to treat infections caused by both Gram-positive and Gram-negative bacteria, including Pseudomonas aeruginosa. In this study, we decided to assess the prevalence of plasmid-mediated quinolone resistance mechanisms among clinical isolates of P. aeruginosa in Ardabil hospitals.
Methods: We analyzed a total of 200 clinical isolates of P. aeruginosa, collected between June 2019 and May 2023. The antibiotic resistance profiles of these strains against various fluoroquinolone antibiotics were determined using the disk diffusion method. Additionally, we investigated the presence of qnrA, qnrB, qnrC, qnrD, and qnrS genes through polymerase chain reaction (PCR) analysis. Furthermore, we assessed the expression levels of efflux pump genes and outer membrane porin genes using the quantitative reverse transcription PCR (qRT-PCR) in fluoroquinolone-resistant P. aeruginosa strains.
Results: Our findings revealed that 69% of P. aeruginosa strains were resistant to fluoroquinolones. The resistance rates for different fluoroquinolones were as follows: ciprofloxacin 55.5%, ofloxacin 62%, norfloxacin 53.5%, lomefloxacin 55.3%, and levofloxacin 55.5%. Notably, 78.9% of these strains exhibited multidrug resistance (MDR). Among the qnr genes, qnrB was the most prevalent (2.9%). No other qnr genes were identified. Interestingly, 75% of P. aeruginosa strains carrying the qnrB gene showed overexpression of efflux pump genes, while 100% exhibited down-regulation of the oprD gene.
Conclusion: Given the high prevalence of fluoroquinolone-resistant P. aeruginosa clinical isolates in Ardabil hospitals and the multifactorial nature of resistance, continuous monitoring of antibiotic resistance trends and understanding the underlying resistance mechanisms are crucial for selecting appropriate treatment strategies.
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