1
|
Assad N, Naeem-Ul-Hassan M, Ajaz Hussain M, Abbas A, Sher M, Muhammad G, Assad Y, Farid-Ul-Haq M. Diffused sunlight assisted green synthesis of silver nanoparticles using Cotoneaster nummularia polar extract for antimicrobial and wound healing applications. Nat Prod Res 2023:1-15. [PMID: 38146228 DOI: 10.1080/14786419.2023.2295936] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 12/07/2023] [Indexed: 12/27/2023]
Abstract
The current study reports the synthesis of silver nanoparticles (Ag NPs) using a polar extract of Cotoneaster nummularia leaves. Various analytical techniques, like UV-Vis spectrophotometry, FT-IR spectroscopy, XRD, SEM, and EDX were employed for characterisation. These techniques confirmed the stability of Ag NPs in solution and endorsed the interaction between different groups and Ag, crystal phase, surface morphology, and size of Ag NPs. UV-Vis spectrophotometer displayed SPR absorption bands ranging from 380 to 470 nm, characteristic of Ag NPs, within 1.0 h exposure to sunlight. XRD and SEM discovered the face-centered cubic crystals of Ag NPs with a 122.8 ± 1.1 nm average diameter. The bands at 525 cm-1 in FT-IR spectrum supported the development of Ag NPs. The Ag NPs showed antimicrobial potential against three pathogenic bacterial strains and two fungal strains. The wound healing results, as studied by tissue re-development and wound closure in rabbits were comparable to standard Sufre tulle® dressing.
Collapse
Affiliation(s)
- Nasir Assad
- Institute of Chemistry, University of Sargodha, Sargodha, Pakistan
| | | | - Muhammad Ajaz Hussain
- Centre for Organic Chemistry, School of Chemistry, University of the Punjab, Lahore, Pakistan
| | - Azhar Abbas
- Institute of Chemistry, University of Sargodha, Sargodha, Pakistan
| | - Muhammad Sher
- Institute of Chemistry, University of Sargodha, Sargodha, Pakistan
| | | | - Yasir Assad
- Department of Zoology, Hazara University, Mansehra, Pakistan
| | | |
Collapse
|
2
|
Khan ZUR, Assad N, Naeem-Ul-Hassan M, Sher M, Alatawi FS, Alatawi MS, Omran AME, Jame RMA, Adnan M, Khan MN, Ali B, Wahab S, Razak SA, Javed MA, Kaplan A, Rahimi M. Correction to: Aconitum lycoctonum L. (Ranunculaceae) mediated biogenic synthesis of silver nanoparticles as potential antioxidant, anti-infammatory, antimicrobial and antidiabetic agents. BMC Chem 2023; 17:143. [PMID: 37880757 PMCID: PMC10601316 DOI: 10.1186/s13065-023-01058-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2023] Open
Affiliation(s)
- Zia Ur Rehman Khan
- Institute of Chemistry, University of Sargodha, 40100, Sargodha, Pakistan
| | - Nasir Assad
- Institute of Chemistry, University of Sargodha, 40100, Sargodha, Pakistan
| | | | - Muhammad Sher
- Institute of Chemistry, University of Sargodha, 40100, Sargodha, Pakistan
| | - Fatema Suliman Alatawi
- Department of Biochemistry, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
| | - Mohsen Suliman Alatawi
- Department of Pediatrics, College of Medicine, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Awatif M E Omran
- Department of Biochemistry, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
| | - Rasha M A Jame
- Department of Chemistry, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
- Department of Chemistry, Faculty of Education, University of Dalanj, Dalanj, Sudan
| | - Muhammad Adnan
- Department of Chemistry, Islamia College Peshawar, 25120, Peshawar, Pakistan
| | | | - Baber Ali
- Department of Plant Sciences, Quaid-I-Azam University, Islamabad, Pakistan
| | - Sana Wahab
- Department of Plant Sciences, Quaid-I-Azam University, Islamabad, Pakistan
| | - Sarah Abdul Razak
- Institute of Biological Sciences, Faculty of Science, Universiti Malaya, Kuala Lumpur, 50603, Malaysia
| | - Muhammad Ammar Javed
- Institute of Industrial Biotechnology, Government College University, 54000, Lahore, Pakistan
| | - Alevcan Kaplan
- Department of Crop and Animal Production, Sason Vocational School, Batman University, 72060, Batman, Turkey
| | - Mehdi Rahimi
- Department of Biotechnology, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran.
| |
Collapse
|
3
|
Khan ZUR, Assad N, Naeem-Ul-Hassan M, Sher M, Alatawi FS, Alatawi MS, Omran AME, Jame RMA, Adnan M, Khan MN, Ali B, Wahab S, Razak SA, Javed MA, Kaplan A, Rahimi M. Aconitum lycoctonum L. (Ranunculaceae) mediated biogenic synthesis of silver nanoparticles as potential antioxidant, anti-inflammatory, antimicrobial and antidiabetic agents. BMC Chem 2023; 17:128. [PMID: 37770921 PMCID: PMC10540474 DOI: 10.1186/s13065-023-01047-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Accepted: 09/22/2023] [Indexed: 09/30/2023] Open
Abstract
In this study, a polar extract of Aconitum lycoctonum L. was used for the synthesis of silver nanoparticles (AgNPs), followed by their characterization using different techniques and evaluation of their potential as antioxidants, amylase inhibitors, anti-inflammatory and antibacterial agents. The formation of AgNPs was detected by a color change, from transparent to dark brown, within 15 min and a surface resonance peak at 460 nm in the UV-visible spectrum. The FTIR spectra confirmed the involvement of various biomolecules in the synthesis of AgNPs. The average diameter of these spherical AgNPs was 67 nm, as shown by the scanning electron micrograph. The inhibition zones showed that the synthesized nanoparticles inhibited the growth of Gram-positive and negative bacteria. FRAP and DPPH assays were used to demonstrate the antioxidant potential of AgNPs. The highest value of FRAP (50.47% AAE/mL) was detected at a concentration of 90 ppm and a DPPH scavenging activity of 69.63% GAE was detected at a concentration of 20 µg/mL of the synthesized AgNPs. 500 µg/mL of the synthesized AgNPs were quite efficient in causing 91.78% denaturation of ovalbumin. The AgNPs mediated by A. lycoctonum also showed an inhibitory effect on α-amylase. Therefore, AgNPs synthesized from A. lycoctonum may serve as potential candidates for antibacterial, antioxidant, anti-inflammatory, and antidiabetic agents.
Collapse
Affiliation(s)
- Zia Ur Rehman Khan
- Institute of Chemistry, University of Sargodha, Sargodha, 40100, Pakistan
| | - Nasir Assad
- Institute of Chemistry, University of Sargodha, Sargodha, 40100, Pakistan
| | | | - Muhammad Sher
- Institute of Chemistry, University of Sargodha, Sargodha, 40100, Pakistan
| | - Fatema Suliman Alatawi
- Department of Biochemistry, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
| | - Mohsen Suliman Alatawi
- Department of Pediatrics, College of Medicine, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Awatif M E Omran
- Department of Biochemistry, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
| | - Rasha M A Jame
- Department of Chemistry, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
- Department of Chemistry, Faculty of Education, University of Dalanj, Dalanj, Sudan
| | - Muhammad Adnan
- Department of Chemistry, Islamia College Peshawar, Peshawar, 25120, Pakistan
| | | | - Baber Ali
- Department of Plant Sciences, Quaid-I-Azam University, Islamabad, Pakistan
| | - Sana Wahab
- Department of Plant Sciences, Quaid-I-Azam University, Islamabad, Pakistan
| | - Sarah Abdul Razak
- Institute of Biological Sciences, Faculty of Science, Universiti Malaya, 50603, Kuala Lumpur, Malaysia
| | - Muhammad Ammar Javed
- Institute of Industrial Biotechnology, Government College University, Lahore, 54000, Pakistan
| | - Alevcan Kaplan
- Department of Crop and Animal Production, Sason Vocational School, Batman University, 72060, Batman, Turkey
| | - Mehdi Rahimi
- Department of Biotechnology, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran.
| |
Collapse
|
4
|
Jabbar A, Abbas A, Assad N, Naeem-Ul-Hassan M, Alhazmi HA, Najmi A, Zoghebi K, Al Bratty M, Hanbashi A, Amin HMA. A highly selective Hg 2+ colorimetric sensor and antimicrobial agent based on green synthesized silver nanoparticles using Equisetum diffusum extract. RSC Adv 2023; 13:28666-28675. [PMID: 37790097 PMCID: PMC10543206 DOI: 10.1039/d3ra05070j] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Accepted: 09/24/2023] [Indexed: 10/05/2023] Open
Abstract
Plasmonic nanoparticles such as Ag have gained great interest in the biomedical domain and chemical analysis due to their unique optical properties. Herein, we report a simple, cost-effective, and highly selective colorimetric sensor of mercury(ii) based on E. diffusum (horsetail) extract-functionalized Ag nanoparticles (ED-AgNPs). The ED-AgNPs were synthesized by exploiting the coordination of Ag+ with the various functional groups of ED extract under sunlight exposure for only tens of seconds. ED-AgNPs (63 nm) were characterized using various techniques such as UV-vis, FTIR, DLS, SEM and EDX. FTIR spectra suggested the successful encapsulation of the AgNPs surface with ED extract and XRD confirmed its crystalline nature. This ED-AgNPs colorimetric sensor revealed remarkable selectivity towards Hg2+ in aqueous solution among other transition metal ions through a redox reaction mechanism. Besides, the sensor exhibited high sensitivity with rapid response and a detection limit of 70 nM. The sensor demonstrated feasibility for Hg(ii) detection in spiked tap and river water samples. In addition, the synthesized ED-AgNPs revealed enhanced antimicrobial activity with higher efficacy against the Gram-positive bacterium (L. monocytogenes with an inhibition zone of 18 mm) than the Gram-negative bacterium (E. coli with an inhibition zone of 10 mm). The simplicity and adaptability of this colorimetric sensor render it a promising candidate for on-site and point-of-care detection of heavy metal ions in diverse conditions.
Collapse
Affiliation(s)
- Amina Jabbar
- Institute of Chemistry, University of Sargodha Sargodha 40100 Pakistan
| | - Azhar Abbas
- Institute of Chemistry, University of Sargodha Sargodha 40100 Pakistan
- Department of Chemistry, Government Ambala Muslim College Sargodha 40100 Pakistan
| | - Nasir Assad
- Institute of Chemistry, University of Sargodha Sargodha 40100 Pakistan
| | | | - Hassan A Alhazmi
- Department of Pharmaceutical Chemistry, College of Pharmacy, Jazan University Jazan 82912 Saudi Arabia
- Substance Abuse and Toxicology Research Centre, Jazan University Jazan 82912 Saudi Arabia
| | - Asim Najmi
- Department of Pharmaceutical Chemistry, College of Pharmacy, Jazan University Jazan 82912 Saudi Arabia
| | - Khalid Zoghebi
- Department of Pharmaceutical Chemistry, College of Pharmacy, Jazan University Jazan 82912 Saudi Arabia
| | - Mohammed Al Bratty
- Department of Pharmaceutical Chemistry, College of Pharmacy, Jazan University Jazan 82912 Saudi Arabia
| | - Ali Hanbashi
- Department of Pharmacology and Toxicology, College of Pharmacy, Jazan University Jazan 82912 Saudi Arabia
| | - Hatem M A Amin
- Chemistry Department, Faculty of Science, Cairo University Giza 12613 Egypt
| |
Collapse
|
5
|
Ghaffar S, Abbas A, Naeem-Ul-Hassan M, Assad N, Sher M, Ullah S, Alhazmi HA, Najmi A, Zoghebi K, Al Bratty M, Hanbashi A, Makeen HA, Amin HMA. Improved Photocatalytic and Antioxidant Activity of Olive Fruit Extract-Mediated ZnO Nanoparticles. Antioxidants (Basel) 2023; 12:1201. [PMID: 37371931 DOI: 10.3390/antiox12061201] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 05/23/2023] [Accepted: 05/26/2023] [Indexed: 06/29/2023] Open
Abstract
Photodegradation is an efficient strategy for the removal of organic pollutants from wastewater. Due to their distinct properties and extensive applications, semiconductor nanoparticles have emerged as promising photocatalysts. In this work, olive (Olea Europeae) fruit extract-based zinc oxide nanoparticles (ZnO@OFE NPs) were successfully biosynthesized using a one-pot sustainable method. The prepared ZnO NPs were systematically characterized using UV-Vis, FTIR, SEM, EDX and XRD and their photocatalytic and antioxidant activity was evaluated. SEM demonstrated the formation of spheroidal nanostructures (57 nm) of ZnO@OFE and the EDX analysis confirmed its composition. FTIR suggested the modification/capping of the NPs with functional groups of phytochemicals from the extract. The sharp XRD reflections revealed the crystalline nature of the pure ZnO NPs with the most stable hexagonal wurtzite phase. The photocatalytic activity of the synthesized catalysts was evaluated by measuring the degradation of methylene blue (MB) and methyl orange (MO) dyes under sunlight irradiation. Improved degradation efficiencies of 75% and 87% were achieved within only 180 min with photodegradation rate constant k of 0.008 and 0.013 min-1 for MB and MO, respectively. The mechanism of degradation was proposed. Additionally, ZnO@OFE NPs exhibited potent antioxidant activity against DPPH, hydroxyl, peroxide and superoxide radicals. Hence, ZnO@OFE NPs may have potential as a cost-effective and green photocatalyst for wastewater treatment.
Collapse
Affiliation(s)
- Sadia Ghaffar
- Institute of Chemistry, University of Sargodha, Sargodha 40100, Pakistan
| | - Azhar Abbas
- Institute of Chemistry, University of Sargodha, Sargodha 40100, Pakistan
- Department of Chemistry, Government Ambala Muslim Graduate College Sargodha, Sargodha 40100, Pakistan
| | | | - Nasir Assad
- Institute of Chemistry, University of Sargodha, Sargodha 40100, Pakistan
| | - Muhammad Sher
- Institute of Chemistry, University of Sargodha, Sargodha 40100, Pakistan
| | - Sami Ullah
- Institute of Chemistry, University of Sargodha, Sargodha 40100, Pakistan
| | - Hassan A Alhazmi
- Department of Pharmaceutical Chemistry and Pharmacognosy, College of Pharmacy, Jazan University, Jazan 82912, Saudi Arabia
- Substance Abuse and Toxicology Research Centre, Jazan University, Jazan 82912, Saudi Arabia
| | - Asim Najmi
- Department of Pharmaceutical Chemistry and Pharmacognosy, College of Pharmacy, Jazan University, Jazan 82912, Saudi Arabia
| | - Khalid Zoghebi
- Department of Pharmaceutical Chemistry and Pharmacognosy, College of Pharmacy, Jazan University, Jazan 82912, Saudi Arabia
| | - Mohammed Al Bratty
- Department of Pharmaceutical Chemistry and Pharmacognosy, College of Pharmacy, Jazan University, Jazan 82912, Saudi Arabia
| | - Ali Hanbashi
- Department of Pharmacology, College of Pharmacy, Jazan University, Jazan 82912, Saudi Arabia
| | - Hafiz A Makeen
- Pharmacy Practice Research Unit, Department of Clinical Pharmacy, College of Pharmacy, Jazan University, Jazan 82912, Saudi Arabia
| | - Hatem M A Amin
- Faculty of Chemistry and Biochemistry, Ruhr University Bochum, 44801 Bochum, Germany
- Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt
| |
Collapse
|
6
|
Khattak S, Idrees M, Iqbal HI, Khan M, Assad N, Khan MN, Yousaf MT, Farooq M, Yang CY, Wu DD, Ji XY. Assessment of Attitudes and Intentions towards COVID-19 Vaccines and Associated Factors among General Populations of Pakistan: A Cross-Sectional Study. Vaccines (Basel) 2022; 10:1583. [PMID: 36298447 PMCID: PMC9609017 DOI: 10.3390/vaccines10101583] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 09/07/2022] [Accepted: 09/15/2022] [Indexed: 07/25/2023] Open
Abstract
OBJECTIVE The goal of public health in combatting COVID-19 is to increase herd immunity. However, vaccine reluctance makes attaining herd immunity a worldwide challenge. This investigation aimed to identify negative and positive attitudes and intentions about COVID-19 vaccinations. METHODS A cross-sectional online survey was conducted once free COVID-19 vaccines became available in Pakistan in 2021. 4392 Pakistanis aged 18 and older were surveyed from seven administrative units between 1 July and 30 August 2021. Online structured questionnaires were utilized to collect data using a simple sampling procedure. The questionnaires were divided into three major sections: sociodemographic, health factors, and attitudes toward COVID-19. RESULTS The survey link was shared with approximately 4500 participants. 97.6%(4392) completed the survey once begun. Frequency, percentage and Chi-square tests were used to analyze statistical data. Most of the participants in the research were men (2703 (61.54%)), 3277 (74.61%) were aged 18-29 years, and 1824 (41.53%) were residents of the Khyber Pakhtunkhwa province. (18.69%) Respondents expressed COVID-19 vaccine hesitancy, whereas 36.66% of participants liked getting the Sinopharm and Sinovac vaccines and (35.84%) of participants preferred the Pfizer vaccine. A significant number of participants (38.05%) were concerned about the vaccine's unexpected side effects Thus, it is essential to realize that many participants were concerned about the vaccine's unexpected side effects. CONCLUSIONS The overall high level of concern about the unforeseen side effects of COVID-19 vaccines, as well as widespread vaccine hesitancy among Pakistani populations and its predictors, should be taken into account if public health intervention campaigns in Pakistan are changing negative attitudes and improving compliance with regard to COVID-19 vaccines.
Collapse
Affiliation(s)
- Saadullah Khattak
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical Sciences, Henan University, Kaifeng 475004, China
- School of Life Sciences, Henan University, Kaifeng 475004, China
| | - Muhammad Idrees
- Primary and Secondary Health Care Department, Lahore 54000, Pakistan
| | - Hafiza Iqra Iqbal
- Primary and Secondary Health Care Department, Lahore 54000, Pakistan
| | - Maqbool Khan
- Sino-Pak Center for Artificial Intelligence, Pak-Austria Fachhochschule: Institute of Applied Sciences and Technology, Haripur 22620, Pakistan
| | - Nasir Assad
- Institute of Chemistry, University of Sargodha, Sargodha 40100, Pakistan
| | - Muhammad Naeem Khan
- School of Social and Behavioral Sciences, Nanjing University, Nanjing 210023, China
| | - Muhammad Tufail Yousaf
- Institute of Microbiology, Faculty of Veterinary and Animal Sciences, Gomal University, Dera Ismail Khan 29111, Pakistan
| | - Muhammad Farooq
- Department of Microbiology, University of Swabi, Swabi 23430, Pakistan
| | - Chang-Yong Yang
- School of Nursing and Health, Henan University, Kaifeng 475004, China
| | - Dong-Dong Wu
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical Sciences, Henan University, Kaifeng 475004, China
- School of Stomatology, Henan University, Kaifeng 475004, China
| | - Xin-Ying Ji
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical Sciences, Henan University, Kaifeng 475004, China
| |
Collapse
|
7
|
Ibrahim O, Zubaid M, Singh R, Arabi A, Assad N, Al Suwaidi J. P1282Diabetes mellitus in atrial fibrillation patients: an observational study from 6 middle eastern countries. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- O Ibrahim
- Hamad Medical Corporation Heart Hospital, Cardiology, Doha, Qatar
| | - M Zubaid
- Kuwait University Hospital, Cardiology, kuwait, Kuwait
| | - R Singh
- Hamad Medical Corporation Heart Hospital, Cardiology, Doha, Qatar
| | - A Arabi
- Hamad Medical Corporation Heart Hospital, Cardiology, Doha, Qatar
| | - N Assad
- Hamad Medical Corporation Heart Hospital, Cardiology, Doha, Qatar
| | - J Al Suwaidi
- Hamad Medical Corporation Heart Hospital, Cardiology, Doha, Qatar
| |
Collapse
|
8
|
Valensi P, Paries J, Assad N, Lormeau B, Attali JR. [Insulin resistance and alteration of cardiac vagal activity in obese patients]. Arch Mal Coeur Vaiss 1999; 92:1101-3. [PMID: 10486673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
We have previously shown that alterations of vagal control of heart rate variations are found in more than half of non diabetic obese subjects (Int J Obes 1995) and are associated with a more severe insulin resistance in noninsulin dependent diabetic patients (Metabolism 1998). The aim of this study was to examine whether parasympathetic alterations are also associated with a more severe insulin resistance in non diabetic obese subjects. 245 obese subjects (BMI = 34.2 +/- 0.4 kg/m2) aged 38.6 +/- 0.8 years, with a normal oral glucose tolerance test were included. Parasympathetic activity was evaluated by heart rate variations during three standardised tests: Valsalva, deep-breathing and active lying-to-standing, with age being taken into account. The Valsalva maneuver was abnormal in 17.5%, the deep-breathing test in 18% and the lying-to-standing test in 30.3% of the cases. One hundred and thirty subjects (52.1%) had at least one abnormal test. Compared with those with three normal tests, the obese subjects with parasympathetic alterations had very similar BMI and blood pressure, but significantly higher values of heart rate (75.5 +/- 1.4 vs 71.3 +/- 1.1 beats/min, p = 0.02), fasting blood glucose (5.0 +/- 0.1 vs 4.8 +/- 0.1 mmol/L, p = 0.03) and plasma insulin (98 +/- 6 vs 82 +/- 4 pmol/L, p = 0.03). In the whole series of obese subjects, heart rate variations during the deep-breathing and lying-to-standing tests correlated negatively with blood glucose (p = 0.001 and p = 0.03 respectively), and during the deep-breathing test they correlated negatively with the waist/hip ratio (p = 0.004). This data suggests that cardiac parasympathetic alterations should take part in the insulin-resistance syndrome and might account for the poor cardiovascular prognosis linked to this syndrome.
Collapse
Affiliation(s)
- P Valensi
- Service d'endocrinologie-diabétologie-nutrition, hôpital Jean-Verdier, université Paris-Nord, Bondy
| | | | | | | | | |
Collapse
|
9
|
Abstract
One of the characteristics of early diabetic nephropathy is glomerular hyperfiltration and hyperperfusion. Many factors have been suggested to induce glomerular hyperperfusion among which are an increased production of vasodilatory prostanoids, an increased synthesis of nitric oxide, a reduced responsiveness of afferent glomerular arterioles to vasoconstrictor stimuli due to diabetic metabolic disturbances and a decreased receptor density for angiotensin II. It has been known for years that angiotensin II is formed locally due to the local activation of the renin angiotensin system. The local angiotensin II concentration, however, is not only regulated by the synthesis rate but also by the local degradation through activation of an aminopeptidase. The main finding of the present study was that the mRNA expression and activity of the angiotensin II degrading enzyme, angiotensinase A, was increased twofold in diabetic rats at 5 weeks and that the increase in mRNA expression was suppressed by insulin therapy and short-term treatment with the angiotensin II antagonist saralasin, whereas angiotensinase A enzyme activity was only reduced by saralasin and not by insulin. These results demonstrate that the angiotensin II degrading exopeptidase angiotensinase A is activated in diabetic glomeruli. This increased activity may be an additional mechanism to explain glomerular hyperfiltration and hyperperfusion in early diabetic nephropathy.
Collapse
Affiliation(s)
- F Thaiss
- Department of Internal Medicine, University Hospital, Hamburg, Germany
| | | | | | | | | |
Collapse
|
10
|
Zabaleta E, Assad N, Oropeza A, Salerno G, Herrera-Estrella L. Expression of one of the members of the Arabidopsis chaperonin 60 beta gene family is developmentally regulated and wound-repressible. Plant Mol Biol 1994; 24:195-202. [PMID: 7906560 DOI: 10.1007/bf00040585] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
To study the pattern of gene regulation of the plastid chaperonin 60 beta gene family a chimaeric gene was constructed fusing the 5'-flanking region of the chaperonin 60 beta B3 gene to the beta-glucuronidase reporter gene. Histochemical and fluorometric analysis of the GUS activity present in transgenic plants harbouring this gene construct showed that the B3 promoter is expressed in leaves, stem, petioles and several flower tissues. The pattern of cell type-specific expression in stems and flowers was found to be developmentally regulated. Expression of the B3 promoter was found not to be heat-inducible, but highly repressed by wounding. The rapid decay in GUS activity upon wounding indicates that, at least under some physiological conditions, the gene product of this reporter gene is not as stable as has been previously thought.
Collapse
Affiliation(s)
- E Zabaleta
- Departamento de Ingeniería Genética de Plantas, Centro de Investigación y de Estudios Avanzados/CINVESTAV-IPN, Irapuato, Guanajuato, México
| | | | | | | | | |
Collapse
|
11
|
Mégnien JL, Simon A, Valensi P, Pithois-Merli I, Assad N, Attali J, Levenson J. [Comparison of isobaric effects of hypertension and diabetes mellitus on geometric and elastic properties of human arteries]. Arch Mal Coeur Vaiss 1991; 84:1101-3. [PMID: 1953257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Hypertensive and diabetic mellitus diseases are known to increase stiffness of the arterial wall. However these alterations probably involve different mechanisms. To this end, we compared the effect of hypertension and diabetes on large artery caliber and elasticity at real pressure conditions and at the same level of pressure. Nine poorly controlled non insulino-dependent diabetic men without hypertension and 9 non-diabetic essential hypertensive men underwent measures of lumen diameter (pulsed Doppler) and segmental compliance (Bramwell and Hill formula; pulse wave velocity) at the brachial artery. Isobaric diameter and compliance were deduced from a non linear model, comparing diameter and pressure on one part, and compliance and pressure on the other. Pulse wave velocity was similarly increased in both diseases (11.5 +/- 1 vs 12.8 +/- 1 m/s; NS; respectively in diabetes and hypertension). Both measured and isobaric diameters were smaller in diabetic patients (4.05 +/- 0.2 vs 5.03 +/- 0.2 mm, p less than 0.1% for the measured diameters respectively in diabetes and hypertension and 4.06 +/- 0.2 vs 5.01 +/- 0.2 mm, p less than 1% for isobaric diameters). The measured and isobaric compliances were not significantly different (2.38 +/- 0.4 vs 2.08 +/- 0.2 cm/mmHg10(-4), NS, for the measured compliance respectively in diabetes and hypertension; 2.28 +/- 0.4 vs 2.4 +/- 0.2, NS for the isobaric compliance). After correction of the effect of mechanical arterial stretch induced by the different blood pressure level of the two groups, significant reduction of diameter in diabetic subjects persisted and isobaric and measured compliances remained unchanged between groups.
Collapse
Affiliation(s)
- J L Mégnien
- Centre de médecine préventive cardiovasculaire, INSERM U 28, hôpital Broussais, Paris
| | | | | | | | | | | | | |
Collapse
|
12
|
Dechamp-Le Roux C, Valensi P, Assad N, Sislian P, Attali JR. [Beliefs in diabetics about the etiology of their disease. Influence of ethnicity]. Diabete Metab 1990; 16:207-12. [PMID: 2210015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The education of diabetics often affects the patient's life-style and habits, and the beliefs of his socio-professional and socio-cultural environment. The patient's knowledge is often satisfactory, while his behavior is inadequate. In this study, a sociologist conducted a semi-structured interview for 40 non-obese diabetic patients: 35 IDD and 5 NIDD, who had a knowledge/behavior gap. Emphasis was placed on the study of their subjective etiological beliefs. Four categories beliefs were found: stress, heredity, food and drink transgression, and fatality. Stress, which can lead to deresponsabilization, was the most frequently mentioned etiology (24 patients). Europeans cited several etiological beliefs. North-Africans, in contrast, cited only one, either stress or fatality, but never heredity or food and drink transgression, probably because genetics and genealogy are not superimposable realities and because of their belief in the symbolic benefits of sugar. In conclusion, the patient's etiological beliefs may contribute to the knowledge/behavior gap. Correct information about a more rational etiology for diabetes could improve patient compliance.
Collapse
Affiliation(s)
- C Dechamp-Le Roux
- Département de Santé Publique, Hôpital Jean Verdier, UFR Paris Nord, Bondy
| | | | | | | | | |
Collapse
|
13
|
Ghorbani M, Edrissian GH, Assad N. Serological survey of toxoplasmosis in the northern part of Iran, using indirect fluorescent antibody technique. Trans R Soc Trop Med Hyg 1978; 72:369-71. [PMID: 360498 DOI: 10.1016/0035-9203(78)90129-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
A total of 1,779 persons from the Caspian Sea area, Iran, were serologically examined by the indirect fluorescent antibody technique for Toxoplasma antibodies. 55.7% were positive with titres of 1:20 or higher. No significant difference was demonstrated between the sexes. The highest antibody level as well as a high geometric mean of reciprocal titres were observed in the population between the ages of two and 19 years.
Collapse
|