Human adipose-derived stem/stromal cells from children or adults?

Since the emergence of regenerative medicine choosing the best source for extracting stem cells has been one of the most important challenges. Discovering a cell type with the highest efficiency and the least side-effects is one of the priorities of scientists active in this field. Of all the cells, mesenchymal stem cells have been and still are of interest to the researchers for use in pre-clinical and clinical studies due to being easily accessible, pluripotency, secretion of numerous growth factors, low risk of immunological rejection, and not having ethical issues for clinical use. Of all mesenchymal cells, human adipose-derived stem/stromal cells (hADSCs) are more safely and easily accessible, produce more growth factors compared to other mesenchymal stem cells, have the ability to differentiate to various cell lines, secrete high levels of angiogenic factor and their feasibility, safety and efficacy have been confirmed. Therefore, in the last decade, it has received more attention from researchers, compared to other cell sources (1-3). Since distribution and function of adipose tissue is versatile and changes at any age during the lifetime (4), it is expected that at different ages, hADSCs also show different functions and abilities. Therefore, it is hypothesized that autologous implantation is not necessarily always the best choice. Autologous transplantation of hADSCs is only the best choice in ages that these cells have the optimum efficacy. If it is determined in what age these cells have the highest efficacy, choosing the type of implantation (autologous or allogeneic) will be an important factor in achieving the best response to treatment. This matter is even more important regarding pediatric diseases. The results of Guasti et al. study in 2012 showed that a smaller volume of lipo-aspirate is needed for extracting hADSCs from children's adipose tissues compared to adults (20 to 30 times less). In addition, many growth factors required for tissue repair are secreted in children's hADSCs, but not in hADSCs of adults; and hADSCs of children carry more markers of differentiation to various cell lines compared to hADSCs of adults. Therefore, they concluded that hADSCs of children have higher plasticity to differentiate into multiple cell lineages compared to their adult type and are better choices for cell therapy of diseases in children (5). What is sure is that autologous use of children's hADSCs is the best choice for stem cell therapy. In addition, in a study Liao et al. aimed to evaluate autologous bone marrow mononuclear cells in treatment of children with traumatic brain injuries and showed that this treatment method leads to a reduction in the intensity of organ damage and neurointensive care duration significantly decreases (6). But can allogeneic use of children's hADSCs for adults be the best choice? This is a question that definitely cannot be answered without performing further preclinical and clinical studies in this field. © 2017, Int J Pediatr

In vitro differentiation of rat mesenchymal stem cells to hepatocyte lineage

Objective(s): Mesenchyme is a type of undifferentiated loose connective tissue that is derived mostly from mesoderm. Recently, mesenchymal stem cells (MSCs), as adult stem cells (ASCs) able to divide into a variety of different cells, are of utmost importance for stem cell research. In this research, ability of the liver extract to induce differentiation of rat derived omentum tissue mesenchymal stem cells (rOT-MSCs) into hepatocyte cells (HCs) was investigated. Materials and Methods: After isolation and confirmation of rOT-MSCs they were co-cultured with liver extract and hepatogenic differentiation was monitored. Expressions of mesenchymal stem cell markers were also analyzed via flow cytometry. Moreover, expressions of octamer-binding transcription factor-4 (Oct-4), Wilm's tumor suppressor gene-1 (WT-1), albumin (ALB), alpha fetoprotein (AFP), cytokeratin-18 (CK-18), and mRNAs were analyzed using RT-PCR on days 16, 18 and 21. ALB production was analyzed by immunocytochemistry and western blot. Furthermore, glycogen and urea production were determined via periodic acid-Schiff (PAS) staining and colorimetric assays respectively. Results: The phenotypic characterization revealed the positive expressions of CD90, CD44 and negative expression of CD45 in rOT-MSCs. These cells also expressed mRNA of Oct-4 and WT-1 as markers of omentum tissue. Differentiated rOT-MSCs in presence of 6 μg/ml liver extract expressed ALB, AFP, CK-18, glycogen and urea as specific markers of HCs. Conclusion: These observations suggest that liver extract is potentially able to induce differentiation of MSCs into hepatocyte lineage and can be considered an available source for imposing tissue healing on the damaged liver. � 2015, Mashhad University of Medical Sciences. All rights reserved

Efficacy of neuromodulation in fecal incontinence in children; a systematic review and meta-analysis

Background: The results of existing studies regarding the use of neuromodulation in fecal incontinence (FI) are contradictory and therefore, a definitive conclusion cannot be made in this regard. Therefore, the aim of the present study was to evaluate the effectiveness of neuromodulation in controlling FI in children through a systematic review.. Materials and Methods: A decision was made to perform the search in electronic databases of Medline, Embase, Web of Science, CINAHL and Scopus until end of October 2017. In the second step, the abstracts of the extracted studies were evaluated by 2 researchers independently and recorded in the data extraction form. Finally, all studies were summarized and categorized based on the evaluated outcomes and overall effect size was presented. . Results: Five studies were included in the present meta-analysis (including 115 children and adolescent). Pooled analysis also showed that the odds of improvement in the group under treatment with nerve stimulation was up to 20 times higher (OR = 20.29; 95 CI: 8.67 to 47.45; p<0.0001). In addition, using nerve stimulation leads to a significant improvement in fecal incontinence score of patients (SMD = 2.32; 95 CI: 1.12 to 3.52; p<0.0001). Conclusion: It can be concluded that neuromodulation can seemingly be an effective measure in controlling FI in children. However, the lack of standard clinical trials in this field is highly felt and it is suggested to assess the effect of neuromodulation on FI by performing blinded randomized clinical trials in future studies

Efficacy of neuromodulation in fecal incontinence in children; a systematic review and meta-analysis

Background: The results of existing studies regarding the use of neuromodulation in fecal incontinence (FI) are contradictory and therefore, a definitive conclusion cannot be made in this regard. Therefore, the aim of the present study was to evaluate the effectiveness of neuromodulation in controlling FI in children through a systematic review.. Materials and Methods: A decision was made to perform the search in electronic databases of Medline, Embase, Web of Science, CINAHL and Scopus until end of October 2017. In the second step, the abstracts of the extracted studies were evaluated by 2 researchers independently and recorded in the data extraction form. Finally, all studies were summarized and categorized based on the evaluated outcomes and overall effect size was presented. . Results: Five studies were included in the present meta-analysis (including 115 children and adolescent). Pooled analysis also showed that the odds of improvement in the group under treatment with nerve stimulation was up to 20 times higher (OR = 20.29; 95 CI: 8.67 to 47.45; p<0.0001). In addition, using nerve stimulation leads to a significant improvement in fecal incontinence score of patients (SMD = 2.32; 95 CI: 1.12 to 3.52; p<0.0001). Conclusion: It can be concluded that neuromodulation can seemingly be an effective measure in controlling FI in children. However, the lack of standard clinical trials in this field is highly felt and it is suggested to assess the effect of neuromodulation on FI by performing blinded randomized clinical trials in future studies

Protective effects of boron and vitamin E on ethylene glycol-induced renal crystal calcium deposition in rat

Objectives. Kidney stone disease is a common form of renal disease. Antioxidants, such as vitamin E (Vit E) and boron, are substances that reduce the damage caused by oxidation. Methods. Adult male rats were divided into 5 groups (n=6). In group 1, rats received standard food and water for 28 days (control group); in group 2, standard rodent food and water with 0.75 ethylene glycol/d (dissolved in drinking water) (EG Group); in group 3, similar to group 2, with 3 mg of boron/d (dissolved in water) (EG+B Group); in group 4, similar to group 2, with 200 IU of vitamin E injected intraperitoneally on the fi rst day and the 14th day, (EG+Vit E Group); in group 5, mix of groups 3 and 4, respectively (EG+B+Vit E Group). Results. Kidney sections showed that crystals in the EG group increased signifi cantly in comparison with the control group. Crystal calcium deposition score in groups of EG+B (160), EG+Vit E, and EG+B+Vit E showed a significant decrease compared to EG group. Measurement of the renal tubules area and renal tubular epithelial histological score showed the highest signifi cant dilation in the EG group. Tubular dilation in the EG+B+Vit E group decreased compared to the EG+B and EG+Vit E groups. Conclusions. Efficient effect of boron and Vit E supplements, separately and in combination, has a complimentary effect in protection against the formation of kidney stones, probably by decreasing oxidative stress. � 2016, De Gruyter Open Ltd. All Rights Reserved

Value of chest computed tomography scan in diagnosis of COVID-19; a systematic review and meta-analysis

Purpose: Real-time polymerase chain reaction (RT-PCR) and chest computed tomography (CT) scan are main diagnostic modalities of coronavirus disease 2019 (COVID-19). However, there is still no consensus on which of these methods is superior to the other. Therefore, the present meta-analysis was designed to answer to the question whether CT scan can be used in diagnosis of COVID-19 or not. Methods: Searches were performed in Medline, Embase, Scopus, and Web of Science databases until the end of April 2020. Two researchers gathered the data of diagnostic accuracy studies that had attempted to evaluate sensitivity and specificity of CT scan in diagnosis of COVID-19. Results: Data of 9 studies were included. Area under the curve of ground glass opacity (GGO), consolidation, pleural effusion, other CT features, and simultaneous observation of GGO with other CT features was 0.64 (95 CI 0.60�0.69), 0.30 (95 CI 0.26�0.34), 0.60 (95 CI 0.56�0.64), 0.61 (95 CI 0.56�0.65), and 0.90 (95 CI 0.87�0.92), respectively. Sensitivity and specificity of simultaneous observation of GGO with other CT scan features was higher than all of the other signs. Sensitivity, specificity, and diagnostic odds ratio of this sign was calculated to be 0.90, 0.89, and 20, respectively. Conclusion: Simultaneous observation of GGO and other features of viral pneumonia in CT scan had optimum performance in detection of COVID-19. However, it is suggested to make the final diagnosis based on both CT scan and RT-PCR, as none of the two diagnostic modalities are reliable alone. © 2020, Italian Association of Nuclear Medicine and Molecular Imaging

Comparison of hepatitis C virus risk factors in genotypes 1a and 3a

Background: One of the most important causes of chronic liver disease is hepatitis C virus (HCV), which causes liver cirrhosis and hepatocellular carcinoma. To control the prevalence of the disease, knowledge and information in risk factor of HCV are required. The aim of this study was to compare the risk factors of infection between HCV patients with genotypes 1a and 3a. Methods: This is an observational analytical study. HCV patients who referred to the clinic of hepatology, Rasoul-e-Akram University Hospital from July 2015 to July 2017, were assigned to the genotype 1a and 3a. Demographic (age, sex, family history), clinical (cirrhosis, hepatocellular carcinoma) and laboratory data, history of intravenous drug and alcohol usage, and history of imprisonment were gathered and compared between two groups. All the patients completed the informed consent form. Data analysis was performed by SPSS software, version 22 (IBM SPSS, Armonk, NY, USA). P value less than 0.05 was considered statistically significant. Results: Overall, 97 HCV patients were included in this study. Mean age was 45±12 years and 78 (80) of patients were male. Among them, 58 (60) and 39 (40) had genotype 1a and 3a. respectively. History of injection drug usage was recorded in 34/39 (87) of patients with genotype 3a, and significantly higher in genotype 3a as compared to genotype 1a OR adj: 3.1, CI (1.3-6.2). Also, in this study, genotype 3a was significantly recorded in younger patients OR adj: 1.7, CI (1.2-4.1). However, cirrhosis and hepatocellular carcinoma was more common in patients with genotype 1a as compared to genotype 3a OR adj: 2.05, CI (1.6-5.4) and OR adj: 2.8, CI (1.3-5.7) respectively. Conclusion: According to the results of this study, hepatitis C virus transmission risk factors differed in genotypes 3a and 1a. Genotype 3a is found among young patients with a history of intravenous drug usage and genotype 1a in patients with cirrhosis and hepatocellular carcinoma. © 2018, Tehran University of Medical Sciences. All rights reserved

A novel intervention technology for cerebral palsy: Brain stimulation

A common pediatric disorder with posture and motor dysfunction in neurological diseases is known as cerebral palsy (CP). Recently, a series of effective techniques have been developed for treatment of CP. These promising methods need high-tech equipment for brain stimulation and mainly classified into invasive and no-invasive approaches. This study aimed to introduce these techniques for treatment of patients who suffer from CP. The potential and performance of currently available brain stimulation techniques have been mentioned in detail. Moreover, the clinical application, safety, efficacy and challenges of these methods have been discussed. Here we review the recent advances in the CP treatment with an emphasis on brain stimulation techniques. © 2019, Iranian Child Neurology Society. All rights reserved

Comparison of hepatitis C virus risk factors in genotypes 1a and 3a

Background: One of the most important causes of chronic liver disease is hepatitis C virus (HCV), which causes liver cirrhosis and hepatocellular carcinoma. To control the prevalence of the disease, knowledge and information in risk factor of HCV are required. The aim of this study was to compare the risk factors of infection between HCV patients with genotypes 1a and 3a. Methods: This is an observational analytical study. HCV patients who referred to the clinic of hepatology, Rasoul-e-Akram University Hospital from July 2015 to July 2017, were assigned to the genotype 1a and 3a. Demographic (age, sex, family history), clinical (cirrhosis, hepatocellular carcinoma) and laboratory data, history of intravenous drug and alcohol usage, and history of imprisonment were gathered and compared between two groups. All the patients completed the informed consent form. Data analysis was performed by SPSS software, version 22 (IBM SPSS, Armonk, NY, USA). P value less than 0.05 was considered statistically significant. Results: Overall, 97 HCV patients were included in this study. Mean age was 45±12 years and 78 (80) of patients were male. Among them, 58 (60) and 39 (40) had genotype 1a and 3a. respectively. History of injection drug usage was recorded in 34/39 (87) of patients with genotype 3a, and significantly higher in genotype 3a as compared to genotype 1a OR adj: 3.1, CI (1.3-6.2). Also, in this study, genotype 3a was significantly recorded in younger patients OR adj: 1.7, CI (1.2-4.1). However, cirrhosis and hepatocellular carcinoma was more common in patients with genotype 1a as compared to genotype 3a OR adj: 2.05, CI (1.6-5.4) and OR adj: 2.8, CI (1.3-5.7) respectively. Conclusion: According to the results of this study, hepatitis C virus transmission risk factors differed in genotypes 3a and 1a. Genotype 3a is found among young patients with a history of intravenous drug usage and genotype 1a in patients with cirrhosis and hepatocellular carcinoma. © 2018, Tehran University of Medical Sciences. All rights reserved

Combination of laser and human adipose-derived stem cells in repair of rabbit anal sphincter injury: a new therapeutic approach

Background: Anal sphincter injury leads to fecal incontinence. Based on the regenerative capability of laser and human adipose-derived stem cells (hADSCs), this study was designed to assess the effects of co-application of these therapies on anal sphincter recovery after injury. Design: Male rabbits were assigned to equal groups (n = 7) including control, sphincterotomy, sphincterotomy treated with laser (660 nm, 90 s, immediately after sphincterotomy, daily, 14 days), hADSCs (2 × 106 hADSCs injected into injured area of the sphincter immediately after sphincterotomy), and laser + hADSCs. Ninety days after sphincterotomy, manometry and electromyography were performed, sphincter collagen content was evaluated, and Ki67, myosin heavy chain (MHC), skeletal muscle alpha-actin (ACTA1), vascular endothelial growth factor A (VEGFA), and vimentin mRNA gene expression were assessed. Results: The laser + hADSCs group had a higher resting pressure compared with the sphincterotomy (p  0.05). In the laser + hADSCs group, motor unit numbers were higher than those in the laser group (p < 0.0001) but did not differ from the hADSCs group (p = 0.075). Sphincterotomy increased collagen content, but the muscle content (p = 0.36) and collagen content (p = 0.37) were not significantly different between the laser + hADSCs and control groups. Laser + hADSCs increased ACTA1 (p = 0.001) and MHC (p < 0.0001) gene expression compared with laser or hADSCs alone and was associated with increased VEGFA (p = 0.009) and Ki67 mRNA expression (p = 0.01) and decreased vimentin mRNA expression (p < 0.0001) compared with laser. Conclusion: The combination of laser and hADSCs appears more effective than either treatment alone for promoting myogenesis, angiogenesis, and functional recovery after anal sphincterotomy.Arash Sarveazad, Asrin Babahajian, Abazar Yari, Chris K. Rayner, Marjan Mokhtare, Arash Babaei-Ghazani, Shahram Agah, Bahar Mahjoubi, Jebreil Shamseddin, and Mahmoud Yousefifar