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Rezaei-Tavirani, Mostafa,Moghaddamnia, Seyed Hassan,Ranjbar, Bijan,Amani, Mojtaba,Marashi, Sayed-Amir Korean Society for Biochemistry and Molecular Biol 2006 Journal of biochemistry and molecular biology Vol.39 No.5
Thermal conformational changes of human serum albumin (HSA) in phosphate buffer, 10 mM at pH = 7 are investigated using differential scanning calorimetric (DSC), circular dichroism (CD) and UV spectroscopic methods. The results indicate that temperature increment from $25^{\circ}C$ to $55^{\circ}C$ induces reversible conformational changes in the structure of HSA. Conformational change of HSA are shown to be a three-step process. Interestingly, melting temperature of the last domain is equal to the maximum value of fever in pathological conditions, i.e. $42^{\circ}C$. These conformational alterations are accompanied by a mild alteration of secondary structures. Study of HSA-SDS (sodium dodecyl sulphate) interaction at $45^{\circ}C$ and $35^{\circ}C$ reveals that SDS affects the HSA structure at least in three steps: the first two steps result in more stabilization and compactness of HSA structure, while the last one induces the unfolding of HSA. Since HSA has a more affinity for SDS at $45^{\circ}C$ compared to $35^{\circ}C$, It is suggested that the net negative charge of HSA is decreased in fever, which results in the decrease of HSA-associated cations and plasma osmolarity, and consequently, heat removal via the increase in urine volume.
Azadeh Izadyari Aghmiuni,Saeed Heidari Keshel,Mostafa Rezaei-Tavirani,Farshid Sefat,Arash Khojasteh,Masoud Soleimani,Farzad Pakdel 한국섬유공학회 2022 Fibers and polymers Vol.23 No.12
Tissue engineering provides new approaches to improve skin lesions. However, cell differentiation onto theengineered substrate with the skin-like pattern is the main challenge. Here we have tried to fabricate such the substrate viastudying the change in polymers ratios and molecular weight, and grafting scaffold with silk fibroin (SF) biomaterial. To thisend, chitosan and PEG were mixed at the volume ratios of 25:75, 50:50, and 65:35, and samples were lyophilized by thefreeze-drying method. Based on the result, the ratio of 65:35 indicated better physicomechanical properties than two otherscaffolds. Afterward, Chi/PEG scaffolds were prepared via mixing chitosan/PEG with (65:35) and PEG molecular weights of2000, 4000, 6000, 10000 Da. It was found that the increase of PEG molecular weight (>4000) was led to the reduction intensile strength and elongation of the scaffold network. Hence, PEG4000 was selected as the optimum molecular weight todesign SF-grafted Chi/PEG scaffold. Therefore, Chi/PEG4000-SF scaffold was designed to evaluate the volume ratio of SF(1 %, 3 %, 5 %) and compare data with the decellularized dermis. The results showed Chi/PEG4000-SF(3%) scaffold not onlywas led to the same elongation as Chi/PEG-SF(5%) scaffold but also created the dermis-like modulus. Moreover, Chi/PEGSF(3%) provided higher expression level of keratinocytes (bio-mimetic pattern) than decellularized dermis due to betterphysicomechanical properties. Hence, it seems that engineered scaffolds can be a more suitable option than native tissue (dueto removal of limitations such as donor sites and immunogenicity, and their mechanical properties). This study can providenovel insight into the better design of skin-engineered scaffolds.
Comparison of Univariate and Multivariate Gene Set Analysis in Acute Lymphoblastic Leukemia
Soheila, Khodakarim,Hamid, AlaviMajd,Farid, Zayeri,Mostafa, Rezaei-Tavirani,Nasrin, Dehghan-Nayeri,Syyed-Mohammad, Tabatabaee,Vahide, Tajalli Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.3
Background: Gene set analysis (GSA) incorporates biological with statistical knowledge to identify gene sets which are differentially expressed that between two or more phenotypes. Materials and Methods: In this paper gene sets differentially expressed between acute lymphoblastic leukaemia (ALL) with BCR-ABL and those with no observed cytogenetic abnormalities were determined by GSA methods. The BCR-ABL is an abnormal gene found in some people with ALL. Results: The results of two GSAs showed that the Category test identified 30 gene sets differentially expressed between two phenotypes, while the Hotelling's $T^2$ could discover just 19 gene sets. On the other hand, assessment of common genes among significant gene sets showed that there were high agreement between the results of GSA and the findings of biologists. In addition, the performance of these methods was compared by simulated and ALL data. Conclusions: The results on simulated data indicated decrease in the type I error rate and increase the power in multivariate (Hotelling's $T^2$) test as increasing the correlation between gene pairs in contrast to the univariate (Category) test.
Conformational Lock and Dissociative Thermal Inactivation of Lentil Seedling Amine Oxidase
( S. Zahra Moosavi Nejad ),( Ali Akbar Moosavi Movahedi ),( Mostafa Rezaei Tavirani ),( Giovanni Floris ),( Rosaria Medda ) 생화학분자생물학회 2003 BMB Reports Vol.36 No.2
The kinetics of thermal inactivation of copper-containing amine oxidase from lentil seedlings were studied in a 100 mM potassium phosphate buffer, pH 7, using putrescine as the substrate. The temperature range was between 47-60℃. The thermal inactivation curves were not linear at 52 and 57℃; three linear phases were shown. The first phase gave some information about the number of dimeric forms of the enzyme that were induced by the higher temperatures using the conformational lock pertaining theory to oligomeric enzyme. The conformational lock caused two additional dimeric forms of the enzyme when the temperature increased to 50℃. The second and third phases were interpreted according to a dissociative thermal inactivation model. These phases showed that lentil amine oxidase was reversibly-dissociated before the irreversible thermal inactivation. Although lentil amine oxidase is not a thermostable enzyme, its dimeric structure can form conformational lock, conferring a structural tolerance to the enzyme against heat stress.
Conformational Lock and Dissociative Thermal Inactivation of Lentil Seedling Amine Oxidase
Moosavi-Nejad, S. Zahra,Moosavi-Movahedi, Ali-Akbar,Rezaei-Tavirani, Mostafa,Floris, Giovanni,Medda, Rosaria Korean Society for Biochemistry and Molecular Biol 2003 Journal of biochemistry and molecular biology Vol.36 No.2
The kinetics of thermal inactivation of copper-containing amine oxidase from lentil seedlings were studied in a 100 mM potassium phosphate buffer, pH 7, using putrescine as the substrate. The temperature range was between $47-60^{\circ}C$. The thermal inactivation curves were not linear at 52 and $57^{\circ}C$; three linear phases were shown. The first phase gave some information about the number of dimeric forms of the enzyme that were induced by the higher temperatures using the "conformational lock" pertaining theory to oligomeric enzyme. The "conformational lock" caused two additional dimeric forms of the enzyme when the temperature increased to $57^{\circ}C$. The second and third phases were interpreted according to a dissociative thermal inactivation model. These phases showed that lentil amine oxidase was reversibly-dissociated before the irreversible thermal inactivation. Although lentil amine oxidase is not a thermostable enzyme, its dimeric structure can form "conformational lock," conferring a structural tolerance to the enzyme against heat stress.
Cross-Linked Collagen Scaffold from Fish Skin as an Ideal Biopolymer for Tissue Engineering
Esmaeil Biazar,Mahshad Kamalvand,Saeed Heidari Keshel,Bahareh Pourjabbar,Mustafa Rezaei-Tavirani 한국재료학회 2022 한국재료학회지 Vol.32 No.4
Collagen is one of the most widely used biological materials in medical design. Collagen extracted from marine organisms can be a good biomaterial for tissue engineering applications due to its suitable properties. In this study, collagen is extracted from fish skin of Ctenopharyngodon Idella; then, the freeze drying method is used to design a porous scaffold. The scaffolds are modified with the chemical crosslinker N-(3-Dimethylaminopropyl)-N'-ethyl carbodiimide hydrochloride (EDC) to improve some of the overall properties. The extracted collagen samples are evaluated by various analyzes including cytotoxicity test, SDS-PAGE, FTIR, DSC, SEM, biodegradability and cell culture. The results of the SDS-PAGE study demonstrate well the protein patterns of the extracted collagen. The results show that cross-linking of collagen scaffold increases denaturation temperature and degradation time. The results of cytotoxicity show that the modified scaffolds have no toxicity. The cell adhesion study also shows that epithelial cells adhere well to the scaffold. Therefore, this method of chemical modification of collagen scaffold can improve the physical and biological properties. Overall, the modified collagen scaffold can be a promising candidate for tissue engineering applications.
Laser Diode – GaAlAs Acupuncture in the Treatment of Central Obesity: a Randomized Clinical Trial
Razzaghi Mohammadreza,Akbari Zahra,Mokmeli Soheila,Razzaghi Zahra,Rezaei-Tavirani Mostafa,Afzalimehr Maryam,Kamani Ehsan 사단법인약침학회 2023 Journal of Acupuncture & Meridian Studies Vol.16 No.6
Background: Obesity is a global health challenge. Traditional approaches, including increased physical activity, dietary interventions, and medical therapy, often yield limited success, propelling some patients toward costly and invasive procedures like bariatric surgery. Laser acupuncture has been suggested as a complementary therapeutic approach to overcome this challenge. The present study investigated the effectiveness of laser acupuncture treatment in weight loss and abdominal subcutaneous fat reduction. Methods: A randomized, blinded, sham-controlled clinical trial was conducted, with 30 subjects each in the intervention and control groups. Patients in the intervention group underwent 12 sessions of laser acupuncture treatment within a month (three sessions/ week), whereas those in the control group received sham laser treatment on identical acupoints. The patients were instructed not to alter their physical activity levels or dietary regimens. All parameters were evaluated before and after the treatment. Results: Significant reductions in weight, body mass index, and waist circumference were noted in both intervention and control groups. Further analysis revealed a more significant decrease in the laser acupuncture group. Abdominal sonography revealed a marked decrease in periumbilical fat thickness in the intervention group. Conversely, laboratory evaluations showed no significant difference between the two groups. Conclusion: Laser acupuncture is an effective method for weight loss in patients with periumbilical abdominal fat. The observed impact on subcutaneous fat suggests its potential as a non-invasive intervention for individuals seeking weight management alternatives. Further research is warranted to validate these findings and explore the underlying mechanisms of laser acupuncture in adipose tissue modulation.
Bordbar, A.K.,Nasehzadeh, A.,Ajloo, D.,Omidiyan, K.,Naghibi, H.,Mehrabi, M.,Khajehpour, H.,Rezaei-Tavirani, M.,Moosavi-Movahedi, A.A. Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.8
Binding of dodecyl trimethylammonium bromide (DTAB) to human and bovine hemoglobin and globin samples has been investigated in 50 mM glycine buffer pH = 10, I = 0.0318 and 300 K by equilibrium dialysis and temperature scanning spectrophotometry techniques and method for calculation of average hydrophobicity. The binding data has been analyzed, in terms of binding capacity concept $({\theta})$, Hill coefficient (nH) and intrinsic Gibbs free energy of binding $({\Delta}Gbv).$ The results of binding data, melting point (Tm) and average hydrophobicity show that human hemoglobin has more structural stability than bovine hemoglobin sample. Moreover the results of binding data analysis represent the systems with two and one sets of binding sites for hemoglobin and globin, respectively. It seems that the destabilization of hemoglobin structure due to removal of heme group, is responsible of such behavior. The results indicating the removal of heme group from hemoglobin caused the depletion of first binding set as an electrostatic site upon interaction with DTAB and exposing the hydrophobic patches for protein.