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Heidari MM, Mazrouei B, Tahmasebi M, Bagheri F, Khanjankhani Z, Khatami M, Dehghani M, Khormizi FZ. Novel nucleotide variations in the thrombomodulin (THBD) gene involved in coagulation pathways can increase the risk of recurrent pregnancy loss (RPL). Gene 2024; 895:148011. [PMID: 37979949 DOI: 10.1016/j.gene.2023.148011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 11/06/2023] [Accepted: 11/15/2023] [Indexed: 11/20/2023]
Abstract
Recurrent pregnancy loss (RPL) is a common but complex complication in fertility conditions, affecting about 15-20% of couples. Although several causes have been proposed for RPL, it occurs in about 35-60% of cases without a known explanation. A strong assumption is that genetic factors play a role in the etiology and pathophysiology of PRL. Therefore, several genes are proposed as candidates in the pathogenesis of RPL. The current study aimed to investigate the effects of nucleotide changes in the THBD (thrombomodulin) gene as an RPL-related candidate gene. This gene encodes a cell receptor for thrombin and is involved in reproductive loss in RPL cases. Its involvement in the natural anticoagulant system has been extensively studied. By genetic screening of the entire coding and noncoding regions of the THBD gene, we found twenty-seven heterozygous and homozygous nucleotide changes. Ten of them led to amino acid substitutions, seven variants were identified in the promoter region, and eight of them occurred in 3'UTR. Potentially, the pathogenicity effects of these variations on THBD protein were evaluated by several prediction tools. The numerous genomic variations prompted noticeable modifications of the protein's structural and functional properties. Furthermore, in-silico scores were consistent with deleterious effects for these mutations. The results of this study provide genetic information that will be useful in the future for clinicians, scientists, and students to understand the unknown causes of RPL better. It may also pave the way for developing diagnostic/prognostic approaches to help treat PRL patients.
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Affiliation(s)
| | | | | | | | | | | | - Mohammadreza Dehghani
- Medical Genetics Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
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Tahmasebi M, Mohammadi S, Hassanpoor H. Low Quality Face Recognition Using an Index Based Super Resolution Technique. INT J PATTERN RECOGN 2023. [DOI: 10.1142/s0218001423560098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
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Tahmasebi M, Esmaeili A, Bambai B. New method of identifying morphine in urine samples using nanoparticle-dendrimer-enzyme hybrid system. ARAB J CHEM 2022. [DOI: 10.1016/j.arabjc.2021.103630] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
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Abolhasani M, Maghbouli N, Karbalai Saleh S, Aghsaeifar Z, Sazgara F, Tahmasebi M, Ashraf H, Haidar Ali J. Which anthropometric and metabolic index is superior in hypertension prediction among overweight/obese adults? Integr Blood Press Control 2021; 14:153-161. [PMID: 34795521 PMCID: PMC8593692 DOI: 10.2147/ibpc.s340664] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 10/14/2021] [Indexed: 11/23/2022] Open
Abstract
Background Although the effectiveness of some combined anthropometric and metabolic scores were evaluated in hypertension prediction, none of them had addressed their accuracy in association with overweight/obese populations. This study examined the accuracy of several anthropometric parameters in this regard and compared the novel indices to the ancient ones. Methods Through a cross-sectional study, 5115 patients have been evaluated at the weight loss clinic. Data on demographic information, anthropometric indices, and biochemical measurements were assembled into a checklist. Multivariable regression modeling and the area under the receiver-operating characteristic (ROC) were analyzed using SPSS version 20. To find new combined scores, SEM (structural equation modeling) analysis was also adopted. P-values < 0.05 were considered statistically significant. Results Considering ancient indices, WHtR (waist-to-height ratio) showed a sufficient area under the curve in predicting hypertension among both genders concomitant with WC (waist circumference) in men, and BRI (body roundness index) in women as highest AUC. The highest odds ratio (OR) for the presence of hypertension, based on the age-adjusted model, was BRI in females (OR, 3.335; 95% confidence interval [CI], 1.58-7.28) and WC in males (OR, 13.478; 95% CI: 1.99-45.02). The combined scores were not superior to the single ones. Conclusion The most powerful association between hypertension and sufficient discrimination ability of normotensives from hypertensive patients was detected for BRI in women and WC among men. However, neither the BSI and BAI nor FMI and FFMI showed superiority to WC or WHtR in predicting the presence of hypertension.
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Affiliation(s)
- Maryam Abolhasani
- Cardiac Primary Prevention Research Center (CPPRC), Tehran Heart Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Nastaran Maghbouli
- Physical Medicine and Rehabilitation Department, Tehran University of Medical Sciences, Tehran, Iran
| | - Shahrokh Karbalai Saleh
- Department of Cardiology, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Ziba Aghsaeifar
- Department of Internal Medicine, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Faeze Sazgara
- Department of Radiology, Guilan University of Medical Sciences, Rasht, Guilan, Iran
| | - Maryam Tahmasebi
- Department of Cardiology, Amir Al Momenin Hospital, Islamic Azad University of Medical Sciences, Tehran, Iran
| | - Haleh Ashraf
- Cardiac Primary Prevention Research Center (CPPRC), Tehran Heart Center and Research Development Center, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Jemal Haidar Ali
- Department of Public Health Nutrition, School of Public Health, College of Health Sciences, Addis Ababa University, Addis Ababa, Ethiopia
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Shokri-Mashhadi N, Tahmasebi M, Mohammadi-Asl J, Zakerkish M, Mohammadshahi M. The antioxidant and anti-inflammatory effects of astaxanthin supplementation on the expression of miR-146a and miR-126 in patients with type 2 diabetes mellitus: A randomised, double-blind, placebo-controlled clinical trial. Int J Clin Pract 2021; 75:e14022. [PMID: 33445213 DOI: 10.1111/ijcp.14022] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 12/26/2020] [Accepted: 01/11/2021] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND The pathogenesis of type 2 diabetes mellitus (T2DM) is associated with chronic oxidative stress and inflammation. It is well known that the expression of some miRNAs such as miRNA-146a is upregulated in diabetic and hyperglycaemic patients, whereas circulating miRNA-126 is reduced. Therefore, we aimed to determine the effects of astaxanthin (AST) supplementation on the circulating malondialdehyde (MDA) and interleukin 6 (IL-6) levels, and the expression of miR-146a and miR-126 in patients with T2DM. METHODS This randomised, double-blind, placebo-controlled clinical trial was conducted in 44 patients with T2DM randomly receiving 8 mg/d of oral AST (n = 22) or placebo (n = 22) for 8 weeks. RESULTS We observed that AST supplementation could decrease plasma levels of MDA and IL-6 (P < .05) and decrease the expression level of miR-146a over time (fold change: -1/388) (P < .05). CONCLUSION AST supplementation might be beneficial for improving circulating MDA and IL-6 and the down-regulation of miR-146a. However, future investigations are suggested to confirm these results.
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Affiliation(s)
- Nafiseh Shokri-Mashhadi
- Department of Clinical Nutrition and Food Security Research Center, School of Nutrition and Food Science, Isfahan University of Medical Sciences, Isfahan, Iran
- Nutrition and Metabolic Diseases Research Center and Department of Nutrition, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Maryam Tahmasebi
- Department of Molecular Genetics, Faculty of Biosciences, Tarbiat Modares University, Tehran, Iran
- Cellular and Molecular Research Center, Ahvaz Jundishapur University of Medical Sciences, Iran
| | - Javad Mohammadi-Asl
- Deptment of Medical Genetics, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Mehrnoosh Zakerkish
- Department of Endocrinology and Metabolism, Health Research Institute, Diabetes Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Majid Mohammadshahi
- Nutrition and Metabolic Diseases Research Center and Department of Nutrition, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
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Tahmasebi M, Soleimanifard S, Sanei A, Karimy A, Abtahi SM. A Survey on Inhibitory Effect of Whole-Body Extraction and Secretions of Lucilia sericata's Larvae on Leishmania major In vitro. Adv Biomed Res 2020; 9:12. [PMID: 32318361 PMCID: PMC7147512 DOI: 10.4103/abr.abr_56_19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 05/26/2019] [Accepted: 11/03/2019] [Indexed: 11/25/2022] Open
Abstract
Background: Leishmaniasis is a skin disease caused by Leishmania parasite. Despite being self-limiting, must be treated. Available drugs have side effects and drug resistance has also been seen. Materials and Methods: Maggot debridement therapy (MDT) is using sterile fly larvae (maggots) of blow flies (Lucilia sericata) for the treatment of different types of tissue wounds. Larvae have excreted and secreted substances that have been proved to have antimicrobial effects, in addition to the some other specifications. Results: In this study, the anti-leishmanial effects of extracts and secretions of sterile second- and third-instar larvae of L. sericata on the growth of Leishmania major promastigotes and amastigotes in the J774 macrophages have been evaluated in vitro. Conclusion: The results showed that extracts and secretions had almost the same leishmaniocidal effect on promastigotes and intracellular amastigotes without cytotoxic effect on macrophages.
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Affiliation(s)
- Maryam Tahmasebi
- Department of Medical Parasitology and Mycology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Simindokht Soleimanifard
- Department of Medical Parasitology and Mycology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Alireza Sanei
- Department of Medical Entomology, School of Health, Hormozgan University of Medical Sciences, Bandar-Abbas, Iran
| | - Azadeh Karimy
- Department of Entomology, Zist Eltiam Sepanta Company, Azad University of Khorasgan, Technology Incubator, Center of Medicinal Plant and Traditional Medicine, Isfahan, Iran
| | - Seyed Mohammad Abtahi
- Department of Medical Parasitology and Mycology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
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Abolhasani M, Maghbouli N, Sazgara F, Karbalai Saleh S, Tahmasebi M, Ashraf H. Evaluation of Several Anthropometric and Metabolic Indices as Correlates of Hyperglycemia in Overweight/Obese Adults. Diabetes Metab Syndr Obes 2020; 13:2327-2336. [PMID: 32753917 PMCID: PMC7342503 DOI: 10.2147/dmso.s254741] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Accepted: 06/15/2020] [Indexed: 11/24/2022] Open
Abstract
AIM Rapid and growing rise in obesity and diabetes mellitus, as serious human health-threatening issues, is alarming. The aim of the present study was assessing the accuracy of several obesity indices to predict hyperglycemia in overweight and obese Iranian populations and determining the value of such indices in comparison to the conventional parameters. We also evaluated new latent combined scores in this matter. PATIENTS AND METHODS Overall, there were 2088 patients recruited from the weight loss clinic of Sina Hospital, an educational hospital of Tehran University of Medical Sciences for this cross-sectional study. Demographic information, anthropometric indices and biochemical measurements were collected and calculated. The multivariable regression modeling as well as area under the receiver-operating characteristic (ROC) analysis was used. To detect the existence of new combined scores, we used SEM (structural equation modeling) analysis through SmartPLS. RESULTS Combined latent scores and WHtR (waist-to-height ratio) gave us a higher area under the curve in predicting hyperglycemia associated with WC (waist circumference) in women, whereas FFMI (fat-free mass index) gave low values. Additionally, BRI (body roundness index) and latent scores had slightly higher AUC values in predicting hyperglycemia in men. According to the age-adjusted odds ratio (OR) in the presence of hyperglycemia, OR was the highest for WHR (waist to hip ratio) in women (OR, 7.74; 95% confidence interval [CI], 1.71-15.13). The association of WHR and hyperglycemia remained significant by adjusting for BMI (body mass index), WC and menopausal status. CONCLUSION WHR had the strongest association with hyperglycemia in women with only sufficient discrimination ability. However, neither BSI (body shape index) and BAI (body adiposity index) nor FMI (fat mass index) and FFMI were superior to BMI (body mass index), WC or WHtR in predicting hyperglycemia. It was revealed that BRI and combined scores had a more predictive power compared to the BSI, BAI, FMI and FFMI, simplifying hyperglycemia evaluation.
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Affiliation(s)
- Maryam Abolhasani
- Cardiac Primary Prevention Research Center (CPPRC), Tehran Heart Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Nastaran Maghbouli
- Physical Medicine and Rehabilitation Department, Tehran University of Medical Sciences, Tehran, Iran
| | - Faeze Sazgara
- Department of Radiology, Guilan University of Medical Sciences, Rasht, Guilan, Iran
| | - Shahrokh Karbalai Saleh
- Department of Cardiology, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Maryam Tahmasebi
- Amir Al Momenin Hospital, Department of Cardiology, Islamic Azad University of Medical Sciences, Tehran, Iran
| | - Haleh Ashraf
- Cardiac Primary Prevention Research Center (CPPRC), Tehran Heart Center, Tehran University of Medical Sciences, Tehran, Iran
- Department of Cardiology, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran
- Correspondence: Haleh Ashraf Research Development Center,Sina Hospital, Emam Khomeini Street, Tehran1136746911, IranFax +66348553 Email
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Tahmasebi M, Sadeghi H, Nazem H, Kokhdan EP, Omidifar N. Hepatoprotective effects of Berberis vulgaris leaf extract on carbon tetrachloride-induced hepatotoxicity in rats. J Educ Health Promot 2018; 7:147. [PMID: 30596119 PMCID: PMC6282695 DOI: 10.4103/jehp.jehp_48_17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2017] [Accepted: 08/28/2018] [Indexed: 06/09/2023]
Abstract
INTRODUCTION Hepatic sickness is a serious problem for human health. The researchers are interested in using medicinal plants including barberry to cure many of these sicknesses. In this study, the effect of hydroalcoholic extract of Berberis vulgaris leaf on hepatic protection was assessed in rats. MATERIALS AND METHODS Forty healthy male Wistar rats were divided randomly into five groups (n = 8): Group 1 (healthy control), intraperitoneal injection of olive oil; Group 2 (hepatotoxic control), intraperitoneal injection of carbon tetrachloride and daily gavage of distilled water; and testing groups, intraperitoneal injection of carbon tetrachloride along with daily gavage of B. vulgaris leaf extract 40, 80, and 120 mg/kg of weight, respectively. After 6 weeks, the following were checked: enzyme level of alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP), as well as serum level of total protein (TP), albumin (ALB), and histopathological status of the liver. RESULTS The level of AST, ALP, and ALT was increased to 109 (IU/L), 95(IU/L), and 71(IU/L), respectively, in hepatotoxic control group than healthy control group, and there was a decrease of 0.86 (g/dl) and 0.04 (g/dl) in TP and ALB levels, respectively. The B. vulgaris extract in every three doses caused a significant decrease in hepatic enzymes level. However, the TP had a significant increase in 80 and 120 mg/kg of body weight. Regarding ALB, there was no significant difference among these groups. The histopathological results were not conformed to biochemical findings. CONCLUSION Using the appropriate dose of B. vulgaris leaf extract can help the improvement of laboratory symptoms of fatty liver.
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Affiliation(s)
- Maryam Tahmasebi
- Department of Biochemistry, Payam-e Noor University of Isfahan, Isfahan, Iran
| | - Heibatollah Sadeghi
- Medical Plants Research Center, Yasuj University of Medical Sciences, Yasuj, Iran
| | - Habibollah Nazem
- Department of Biochemistry, Payam-e Noor University of Shahreza, Shahreza, Iran
| | | | - Navid Omidifar
- Clinical Education Research Center, Zeinabieh Hospital, Department of Pathology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
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Tahmasebi M, Labbafi M, Emam-Djomeh Z, Yarmand MS. Manufacturing the novel sausages with reduced quantity of meat and fat: The product development, formulation optimization, emulsion stability and textural characterization. Lebensm Wiss Technol 2016. [DOI: 10.1016/j.lwt.2015.12.011] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Khajali F, Tahmasebi M, Hassanpour H, Akbari M, Qujeq D, Wideman R. Effects of supplementation of canola meal-based diets with arginine on performance, plasma nitric oxide, and carcass characteristics of broiler chickens grown at high altitude. Poult Sci 2011; 90:2287-94. [DOI: 10.3382/ps.2011-01618] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Homaeinezhad MR, Atyabi SA, Daneshvar E, Ghaffari A, Tahmasebi M. Discrete Wavelet-Aided Delineation of PCG Signal Events via Analysis of an Area Curve Length-Based Decision Statistic. ACTA ACUST UNITED AC 2010; 10:218-34. [DOI: 10.1007/s10558-010-9110-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Homaeinezhad MR, Ghaffari A, Toosi HN, Tahmasebi M, Daevaeiha MM. Optimal Delineation of Ambulatory Holter ECG Events via False-Alarm Bounded Segmentation of a Wavelet-Based Principal Components Analyzed Decision Statistic. ACTA ACUST UNITED AC 2010; 10:136-56. [DOI: 10.1007/s10558-010-9103-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
Angiotensin II has mitogenic and angiogenic effects and its receptors are widespread, particularly in epithelial tissue. Tissue renin angiotensin systems (tRASs) may be a local source of angiotensin II that has specific paracrine functions. To investigate the presence of a tRAS in normal human breast and tumours. Immunocytochemistry, and quantitative RT–PCR was used to establish: (i) the presence and localisation of RAS components, (ii) the possibility of their involvement in cancer. (1) mRNA coding for angiotensinogen, prorenin, angiotensin converting enzyme (ACE), and both AT1 and AT2 receptors was demonstrated in normal and diseased breast tissues. (2) (pro)renin was identified in epithelial cells in both normal and diseased tissue, but in invasive carcinoma, its distribution was mostly confined to fibroblasts or could not be detected at all. (3) Angiotensin converting enzyme was shown in epithelial cells in both normal and malignant tissue. The results are consistent with the hypothesis that a tRAS is present in the breast, and is disrupted in invasive cancer.
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MESH Headings
- Angiotensin II/metabolism
- Angiotensinogen/genetics
- Breast Neoplasms/genetics
- Breast Neoplasms/metabolism
- Breast Neoplasms/pathology
- Female
- Gene Expression Profiling
- Humans
- Immunohistochemistry
- Mammary Glands, Human/cytology
- Mammary Glands, Human/metabolism
- Neoplasm Invasiveness
- Peptidyl-Dipeptidase A/genetics
- RNA, Messenger/genetics
- Receptor, Angiotensin, Type 1/biosynthesis
- Receptor, Angiotensin, Type 1/genetics
- Receptor, Angiotensin, Type 2/biosynthesis
- Receptor, Angiotensin, Type 2/genetics
- Renin/genetics
- Renin-Angiotensin System/genetics
- Reverse Transcriptase Polymerase Chain Reaction/methods
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Affiliation(s)
- M Tahmasebi
- School of Biological Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, UK
| | - S Barker
- School of Biological Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, UK
| | - J R Puddefoot
- School of Biological Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, UK
- E-mail:
| | - G P Vinson
- School of Biological Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, UK
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Abstract
Evidence exists for the presence of a discrete tissue renin-angiotensin system (RAS) in mouse and rat pancreas that is thought largely to be associated with the vasculature. To investigate this in the human pancreas, and to establish whether the cellular sites of RAS components include the islets of Langerhans, we used immunocytochemistry to localise the expression of angiotensin II (AT1) receptors and (pro)renin, and non-isotopic in situ hybridisation to localise transcription of the (pro)renin gene. Identification of cell types in the islets of Langerhans was achieved using antibodies to glucagon and insulin. The results show the presence of the AT1 receptor and (pro)renin both in the beta cells of the islets of Langerhans, and in endothelial cells of the pancreatic vasculature. Transcription of (pro)renin mRNA, however, was confined to connective tissue surrounding the blood vessels and in reticular fibres within the islets. These findings are similar to those obtained in other tissues, and suggest that renin may be released from its sites of synthesis and taken up by possible cellular sites of action. The results presented here suggest that a tissue RAS may be present in human pancreas and that it may directly affect beta cell function as well as pancreatic blood flow.
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Affiliation(s)
- M Tahmasebi
- Division of Biomedical Sciences, Queen Mary & Westfield College, Mile End Road, London E1 4NS, UK
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Abstract
The angiotensin II type 1 (AT1) receptor is present in a wide variety of human and animal tissues, and is particularly abundant in epithelial cells. Because of this, and because it is known that tissue renin angiotensin systems (RASs) exist that have specific local functions, we investigated the expression and localisation of components of the RAS in normal and diseased breast tissue. Using a monoclonal antibody to the AT1 receptor, immunocytochemistry confirmed that the AT1 receptor was characteristically distributed in ductal epithelial cells in both normal and malignant tissue, and in most, although not all, cells in invasive tumours. Transcription of prorenin mRNA was studied by in situ hybridisation, using a DIG-ddUTP tail-labelled probe specific for the human prorenin gene. In normal tissue, and in cases of ductal carcinoma in situ, prorenin mRNA was distributed in myoepithelial cells and in a band of connective tissue cells completely surrounding the AT1-containing ductal epithelial cells. This prorenin transcribing tissue was disrupted and attenuated in invasive tumours, and in some of these, prorenin mRNA transcription could not be detected at all. Functions ascribed to the tissue RASs include regulation of mitosis and tissue modelling, as well as fluid and electrolyte transport. The results presented here strongly suggest the possibility that a tissue RAS may also be present in the breast, closely coupled to the provision of angiotensin II to the AT1 receptors in ductal epithelial cells. This mechanism is disrupted in cancer.
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Affiliation(s)
- M Tahmasebi
- Department of Biochemistry, Queen Mary and Westfield College, London, U.K
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