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Nahar A, Hasan SK, Haq AI, Dowllah E, Al-Amin M, Sayeed SJ, Sikder MH, Rahman MM, Akhtaruzzaman M, Hoque MT. Dysfunction of Thyroid Hormones Following Acute Coronary Syndrome in a Tertiary Care Hospital in Dhaka City. Mymensingh Med J 2024; 33:486-491. [PMID: 38557530] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
In cardiovascular homeostasis thyroid hormone plays an important role. We planned to study the changes in thyroid hormone profile in acute coronary syndrome patients admitted in the coronary care unit and compare them between two groups: unstable angina/non-ST elevated Myocardial infarction (UA/NSTEMI) and ST elevated Myocardial infarction (STEMI). This study was a hospital based descriptive cross sectional study which was conducted from 01 March 2018 to 01 February 2019 in Coronary Care Unit of Bangladesh Medical College Hospital and laboratory tests were done in Microbiology Department of Bangladesh Medical College, Dhaka, Bangladesh. Eighty three cases of acute coronary syndromes were taken for the study. Troponin-I was measured as cardiac marker, Electrocardiogram, Complete blood count, blood glucose level, Blood urea, serum creatinine, serum electrolytes, Fasting lipid profile, Thyroid profile, Echocardiography 2D were done. Most of the respondents were distributed in age group 46-60 years where 34(64.15%) male and 19(35.85%) female. Out of 83 Acute Coronary Syndrome (ACS) patients, 27(32.53%) hypertensive, 22(26.50%) diabetic and 16(19.27%) were Chronic kidney disease (CKD). Abnormal lipid profile was present in 30(43.47%) patients. Among total 52 male and 31 female 9(17.30%) male and 6(19.35%) female had abnormal thyroid function. We further elaborated abnormal thyroid function tests in STEMI group and UA/Non STEMI group of ACS patients. We found 10 patients in STEMI group and 5 patients in UA/Non STEMI group with abnormal thyroid function 29.41% and 10.20% respectively which was not statistically significant (p=0.025). This study depicts abnormality in thyroid hormone profile in 18.07% patients of ACS. Abnormal thyroid function increases risk of coronary artery disease. TSH level of ACS patients on hospital admission could be helpful to evaluate further prognosis of the disease.
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Affiliation(s)
- A Nahar
- Dr Azizun Nahar, Associate Professor of Microbiology, Bangladesh Medical College (BMC), Dhaka, Bangladesh; E-mail:
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Hassan AB, Tayem YI, Sadat-Ali M, Almarabheh AJ, Alawadhi A, Butt AJ, Jahrami H, Saleh J, Matar ME, Shaikh M, Hasan SK, Karashi AR. The estimated prevalence of osteoporosis in Bahrain: a multi-centered-based study. BMC Musculoskelet Disord 2024; 25:9. [PMID: 38167308 PMCID: PMC10759480 DOI: 10.1186/s12891-023-07145-8] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Accepted: 12/21/2023] [Indexed: 01/05/2024] Open
Abstract
OBJECTIVES the primary aim of this study was to examine the prevalence and risk factors of low bone mineral density in Bahrain. METHODS this was a retrospective study, which targeted a cohort of 4822 Bahraini subjects (mean age 59.36 years: 93% females). Demographic data and results of lumbar and femur DEXA scan for the targeted sample, over the period 2016-2018, were retrieved from four hospitals. RESULTS The prevalence of low BMD was 62.3% (46.4% had osteopenia and 15.9% had osteoporosis). The highest rate of osteopenia was detected at the age group younger than 44 years. However, with increasing age, the rate of osteopenia declined, whereas osteoporosis increased (P < 0.001). Females were found to be at higher risk of developing both osteopenia (45.8%) and osteoporosis (18.1%) compared to males (39% and 12.4%, respectively) (P < 0.001). Postmenopausal women exhibited higher rates of low BMD (42.4% osteopenia, 22.3% osteoporosis) compared to elderly men (30.9% osteopenia, 9% osteoporosis). CONCLUSIONS We reported high prevalence of osteopenia and osteoporosis in Bahrain. Low BMD was more common in females, especially in postmenopausal women. Highest prevalence of osteopenia happened at young age. Therefore, we advocate screening at younger age than previously recommended.
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Affiliation(s)
- Adla Bakri Hassan
- College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Kingdom of Bahrain.
- King Abdullah Medical City, Manama, Kingdom of Bahrain.
| | - Yasin I Tayem
- College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Kingdom of Bahrain
| | - Mir Sadat-Ali
- King Abdullah Medical City, Manama, Kingdom of Bahrain
| | - Amer J Almarabheh
- College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Kingdom of Bahrain
| | | | - Ahsan J Butt
- King Hamad University Hospital, Manama, Kingdom of Bahrain
| | - Haitham Jahrami
- College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Kingdom of Bahrain
- Psychiatric Hospital, Government Hospitals, Manama, Kingdom of Bahrain
| | - Jamal Saleh
- Orthocare, Orthopaedic Centre, Manama, Kingdom of Bahrain
| | - Mai E Matar
- College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Kingdom of Bahrain
- King Abdullah Medical City, Manama, Kingdom of Bahrain
| | - Mansoor Shaikh
- Orthocare, Orthopaedic Centre, Manama, Kingdom of Bahrain
| | - Salman K Hasan
- King Hamad University Hospital, Manama, Kingdom of Bahrain
| | - Ali R Karashi
- College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Kingdom of Bahrain
- Salmaniya Medical Complex, Government Hospitals, Manama, Kingdom of Bahrain
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Hasan SK, Nahar A, Ahmed SR, Sayeed SJ, Hasnat S, Rashid KY, Diba F, Hasan MM, Chowdhury RA. Wound Infection in Surgical Ward of a Tertiary Care Hospital in Dhaka City: The Identification of Organisms and Their Sensitivity Pattern. Mymensingh Med J 2024; 33:125-132. [PMID: 38163783] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
Wound infection is one of the most important causes of morbidity and mortality worldwide. The aim of this study was to identify the organisms and their sensitivity pattern from wound infection patients attending in a tertiary care hospital in Dhaka city. This cross-sectional study was carried out in a total of 240 aseptically collected wound swab samples from wound infection suspected patients visiting Bangladesh Medical College Hospital, Dhaka, Bangladesh were analyzed from July 2017 to June 2019. Bacteriological culture of the samples, colony morphology, Gram's staining, and biochemical tests were done following standard microbiological techniques. The antimicrobial susceptibility testing was performed by modified Kirby-Bauer disc diffusion technique following clinical and laboratory standards institute guidelines. Out of 240 wound swab samples from suspected patients of wound infection, 126(52.5%) showed bacterial growth whereas 114(47.5%) were culture negative. No sample yielded more than one organism. Among 126 culture positive cases 75(59.52%) were male and 51(40.48%) were female. The higher rate of bacterial infections 26.19% was noted in the age group of 21-30 years, followed by the age group of 31-40 years, 41-50 years, 51-60 years. Among 126 culture positive cases, 74.6% were Gram negative and 25.4% were Gram positive bacteria. Out of total 126 isolates, E. coli was the most prevalent pathogen 31(24.60%) followed by Staphylococcus aureus 29(23.01%); Pseudomonas 27(21.43%); Klebsiella 18(14.29%); Enterobacter 12(9.52%); Acinetobacter 4(3.17%), while Coagulase negative Staphylococcus 3(2.38%) and Proteus 2(1.59%) were least detected isolates in wound swab. Highly effective antibiotics against Staph aureus were vancomycin 100.0%; imipenem 100.0%; linezolid 100.0% and meropenem 89.65%. Amikacin; gentamicin; netilmicin; imipenem and meropenem showed higher sensitivity in E coli, Klebsiella and Enterobacter species. Colistin was 88.88% effective against Pseudominas spp. followed by imipenem 81.48%, piperacillin-tazobactam 77.78%, meropenem 70.37% and amikacin 51.85%. Acinetobacter spp. showed 75.0% and 50.0% sensitivity to netilmicin and colistin respectively. Injectable and reserve drugs were sensitive to bacterial populations among patients of wound infections in our hospital. It is a wake-up call for clinician to treat wound infections. To prevent the increase resistance to antibiotics, it is necessary to avoid the administration of uncontrolled and unnecessary antibiotics available.
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Affiliation(s)
- S K Hasan
- Dr Syed Khalid Hasan, Associate Professor, Department of Surgery, Bangladesh Medical College & Hospital, Dhaka, Bangladesh; E-mail:
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Hasan SK. Radial basis function‐based exoskeleton robot controller development. IET Cyber-Syst and Robotics 2022. [DOI: 10.1049/csy2.12057] [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: 11/19/2022] Open
Affiliation(s)
- SK Hasan
- Department of Mechanical and Manufacturing Engineering Miami University Oxford Ohio USA
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Alfonso V, Iaccarino L, Ottone T, Cicconi L, Lavorgna S, Divona M, Cairoli R, Cristiano A, Ciardi C, Travaglini S, Falconi G, Hasan SK, Venditti A, Arcese W, Voso MT, Lo-Coco F. Early and sensitive detection of PML-A216V mutation by droplet digital PCR in ATO-resistant acute promyelocytic leukemia. Leukemia 2019; 33:1527-1530. [PMID: 30651632 DOI: 10.1038/s41375-018-0298-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Accepted: 09/18/2018] [Indexed: 01/05/2023]
Affiliation(s)
- V Alfonso
- Department of Biomedicine and Prevention, University of Tor Vergata, Rome, Italy
| | - L Iaccarino
- Department of Biomedicine and Prevention, University of Tor Vergata, Rome, Italy
| | - T Ottone
- Department of Biomedicine and Prevention, University of Tor Vergata, Rome, Italy.,Neuroimmunology and Flow Cytometry Units, Fondazione Santa Lucia-I.R.C.C.S, Rome, Italy
| | - L Cicconi
- Department of Biomedicine and Prevention, University of Tor Vergata, Rome, Italy
| | - S Lavorgna
- Department of Biomedicine and Prevention, University of Tor Vergata, Rome, Italy.,Neuroimmunology and Flow Cytometry Units, Fondazione Santa Lucia-I.R.C.C.S, Rome, Italy
| | - M Divona
- Department of Biomedicine and Prevention, University of Tor Vergata, Rome, Italy
| | - R Cairoli
- Division of Hematology, Niguarda Hospital, Milan, Italy
| | - A Cristiano
- Department of Biomedicine and Prevention, University of Tor Vergata, Rome, Italy
| | - C Ciardi
- Department of Biomedicine and Prevention, University of Tor Vergata, Rome, Italy
| | - S Travaglini
- Department of Biomedicine and Prevention, University of Tor Vergata, Rome, Italy
| | - G Falconi
- Department of Biomedicine and Prevention, University of Tor Vergata, Rome, Italy
| | - S K Hasan
- CRI Lab 2, ACTREC, Homi Bhabha National Institute, Mumbai, India
| | - A Venditti
- Department of Biomedicine and Prevention, University of Tor Vergata, Rome, Italy
| | - W Arcese
- Department of Biomedicine and Prevention, University of Tor Vergata, Rome, Italy
| | - M T Voso
- Department of Biomedicine and Prevention, University of Tor Vergata, Rome, Italy
| | - F Lo-Coco
- Department of Biomedicine and Prevention, University of Tor Vergata, Rome, Italy. .,Neuroimmunology and Flow Cytometry Units, Fondazione Santa Lucia-I.R.C.C.S, Rome, Italy.
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Barnwal P, Vafa A, Afzal SM, Shahid A, Hasan SK, Alpashree, Sultana S. Benzo(a)pyrene induces lung toxicity and inflammation in mice: prevention by carvacrol. Hum Exp Toxicol 2017; 37:752-761. [DOI: 10.1177/0960327117735572] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Benzo(a)pyrene (B(a)P) is an environmental pollutant which causes various lung toxicities. The present study was designed to evaluate the protective effects of carvacrol, a monoterpenic phenol against B(a)P-induced lung toxicity. In this study, Swiss albino mice were pretreated with carvacrol (25 mg/kg and 50 mg/kg) orally for 7 consecutive days before administering oral B(a)P (125 mg/kg). Preventive efficacy of carvacrol was assessed in terms of membrane oxidation, antioxidant enzyme activities, histopathological changes, and inflammatory (iNOS, NF-κB, and COX-2) markers. Carvacrol pretreatment in the two doses restored B(a)P-induced lipid peroxidation and increased the activities of antioxidant enzymes. Protein expressions of iNOS, NF-κB, and COX-2 in the lung tissue were found to be upregulated by B(a)P. Carvacrol treatment, however, downregulated their expressions by decreasing the marker of positive stained cells and restored the histopathological architecture of lung tissue. Our results suggest that carvacrol can be used as a protective agent against B(a)P-induced lung toxicity and inflammation.
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Affiliation(s)
- P Barnwal
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Faculty of Science, Jamia Hamdard (Hamdard University), New Delhi, India
| | - A Vafa
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Faculty of Science, Jamia Hamdard (Hamdard University), New Delhi, India
| | - SM Afzal
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Faculty of Science, Jamia Hamdard (Hamdard University), New Delhi, India
| | - A Shahid
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Faculty of Science, Jamia Hamdard (Hamdard University), New Delhi, India
| | - SK Hasan
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Faculty of Science, Jamia Hamdard (Hamdard University), New Delhi, India
| | - Alpashree
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Faculty of Science, Jamia Hamdard (Hamdard University), New Delhi, India
| | - S Sultana
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Faculty of Science, Jamia Hamdard (Hamdard University), New Delhi, India
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Ali R, Shahid A, Ali N, Hasan SK, Majed F, Sultana S. Amelioration of Benzo[a]pyrene-induced oxidative stress and pulmonary toxicity by Naringenin in Wistar rats: A plausible role of COX-2 and NF-κB. Hum Exp Toxicol 2016; 36:349-364. [PMID: 27206700 DOI: 10.1177/0960327116650009] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Naringenin is a naturally occurring flavanones and has been found to exhibit free radical scavenging, enzyme inhibition, antioxidants, anti-inflammatory, and anticancer activities. Present study was designed to evaluate the protective role of naringenin against benzo[a]pyrene (B[a]P)-induced oxidative stress and pulmonary toxicity. Rats were treated with naringenin at a dose of 100 mg/kg body weight (b. wt.), by oral gavage. B[a]P in a single dose of 50 mg/kg b. wt. was given intraperitoneally. Total protein, total cell counts, lactate dehydrogenase, lipid peroxidation, reduced glutathione, antioxidant enzymes activities, lung histology and expression of nuclear factor kappa B (NF-κB), and cyclo-oxygenase-2 (COX-2) was assessed to evaluate protective effects of naringenin. Histopathological and immunohistochemical studies were also carried out to observe lung toxicity and inflammation. B[a]P administration enhanced the levels of lung injury markers and reduced antioxidant enzymes activities. Naringenin treatment attenuated the levels of oxidative stress by restoring antioxidant enzymes, further improved lung histological damage and significant decrease in inflammatory responses. Naringenin also effectively decreased the expression of NF-κB, and COX-2 induced by B[a]P. These findings suggest that naringenin supplementation is beneficial in maintaining the integrity of alveoli and the epithelium that may be used as a protective agent in B[a]P-induced oxidative stress and lung damage. However, further studies are warranted to elucidate the potential mechanism of action of naringenin.
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Affiliation(s)
- R Ali
- Department of Medical Elementology and Toxicology, Section of Molecular Carcinogenesis and Chemoprevention Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
| | - A Shahid
- Department of Medical Elementology and Toxicology, Section of Molecular Carcinogenesis and Chemoprevention Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
| | - N Ali
- Department of Medical Elementology and Toxicology, Section of Molecular Carcinogenesis and Chemoprevention Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
| | - S K Hasan
- Department of Medical Elementology and Toxicology, Section of Molecular Carcinogenesis and Chemoprevention Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
| | - F Majed
- Department of Medical Elementology and Toxicology, Section of Molecular Carcinogenesis and Chemoprevention Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
| | - S Sultana
- Department of Medical Elementology and Toxicology, Section of Molecular Carcinogenesis and Chemoprevention Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
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Hasan SK, Khan R, Ali N, Khan AQ, Rehman MU, Tahir M, Lateef A, Nafees S, Mehdi SJ, Rashid S, Shahid A, Sultana S. 18-β Glycyrrhetinic acid alleviates 2-acetylaminofluorene-induced hepatotoxicity in Wistar rats. Hum Exp Toxicol 2014; 34:628-41. [DOI: 10.1177/0960327114554045] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
2-Acetylaminofluorene (2-AAF) is a known hepatic carcinogen which leads to tumour formation in rodents. 18-β Glycyrrhetinic acid (18 β-GA) derived from liquorice plant has various pharmacological properties such as anti-ulcer, anti-inflammatory, antiviral, hepatoprotective and antioxidant. This study is designed to elucidate the chemopreventive properties of 18 β-GA against 2-AAF-induced liver toxicity in Wistar rats and evaluated its effect on inflammatory and tumour promotion marker and activities of different oxidative stress enzymes. Administration of 2-AAF at the dose of (50 mg/kg body weight (b.w.) intraperitoneally (i.p.)) for five consecutive days induces hepatic toxicity, inflammation, oxidative stress and hyperproliferation. Pretreatment with 18 β-GA at two different doses (45 and 75 mg kg−1 b.w.) significantly ameliorates 2-AAF-induced increased lipid peroxidation, alanine transaminase and aspartate transaminase, xanthine oxidase activities and activities of phase-II detoxifying enzymes along with the levels of glutathione content. Administration of 18 β-GA also significantly restored the expressions of proliferating cell nuclear antigen, cyclooxygenase 2, inducible nitric oxide synthase and nuclear factor κB. Furthermore, histological observations also support the preventive effects of 18 β-GA. Our findings suggest that pretreatment with 18 β-GA showed potential hepatoprotective effects via attenuation of oxidative stress, inflammation and hyperproliferation.
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Affiliation(s)
- SK Hasan
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
| | - R Khan
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
| | - N Ali
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
| | - AQ Khan
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
| | - MU Rehman
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
| | - M Tahir
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
| | - A Lateef
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
| | - S Nafees
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
| | - SJ Mehdi
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
| | - S Rashid
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
| | - A Shahid
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
| | - S Sultana
- Section of Molecular Carcinogenesis and Chemoprevention, Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi, India
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Hasan SK, Buttari F, Ottone T, Voso MT, Hohaus S, Marasco E, Mantovani V, Garagnani P, Sanz MA, Cicconi L, Bernardi G, Centonze D, Lo-Coco F. Risk of acute promyelocytic leukemia in multiple sclerosis: coding variants of DNA repair genes. Neurology 2011; 76:1059-65. [PMID: 21346221 DOI: 10.1212/wnl.0b013e318211c3c8] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Single nucleotide polymorphisms (SNPs) in double-strand break repair genes may alter DNA repair capacity and, in turn, confer predisposition to leukemia. We analyzed polymorphic variants of DNA repair and detoxification genes in patients with multiple sclerosis (MS) who developed secondary acute promyelocytic leukemia (sAPL), in most cases after treatment with mitoxantrone (MTZ). METHODS Using MassARRAY high-throughput DNA analysis with matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, we genotyped patients with sAPL (n=20) developed after treatment of MS (18 out 20 treated with MTZ) for the presence of 210 SNPs of 22 genes mostly involved in DNA repair and drug detoxification. Patients with MS who did not develop sAPL including 41 treated with MTZ (n=253 and 41, respectively) and healthy blood donors (n=310) were also genotyped as controls. RESULTS We observed risk allele frequency between MS and sAPL for BRCA2 (rs1801406): 6% and 26%, p=0.007; XRCC5 (rs207906): 2.5% and 15%, p=0.016; CYP3A4 (rs2740574): 4.5% and 25%, p=0.0035. The association of homozygous variants of BRCA2 and XRCC5 yielded higher risk of sAPL (MS vs sAPL: 0.4% and 18%, p=0.001). We also observed a significant association between a SNP in the promoter region (rs2740574) of CYP3A4, an enzyme involved in the metabolism of chemotherapeutic agents and development of sAPL. CONCLUSIONS Increased susceptibility to develop sAPL in patients with MS receiving MTZ may be linked to genetic variants in DNA repair and drug-metabolizing enzymes that result in impaired detoxification of chemotherapy or inefficient repair of drug-induced genetic damage.
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Affiliation(s)
- S K Hasan
- Department of Biopathology, University Tor Vergata, Via Montpellier 1, 00133, Rome, Italy.
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Joshi S, Husain MM, Chandra R, Hasan SK, Srivastava RC. Hydroxyl radical formation resulting from the interaction of nickel complexes of L-histidine, glutathione or L-cysteine and hydrogen peroxide. Hum Exp Toxicol 2005; 24:13-7. [PMID: 15727051 DOI: 10.1191/0960327105ht493oa] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
L-histidine, L-cysteine, reduced glutathione (GSH) and other bioligands, which are ubiquitously present in biological systems, are recognized as antioxidants. Studies have shown that nickel (II) complexed with these ligands catalyzes the disproportionation of H2O2, leading to the generation of hydroxyl radicals (OH radical). However, none of the studies could provide information regarding effective concentrations at which these ligands act either as pro-oxidant or antioxidant. Therefore, the observed paradoxical behaviour of biological antioxidants in nickel-induced oxidative response was evaluated. Benzoic acid (BA) is hydroxylated by OH radical to form highly fluorescent dihydroxy benzoate (OH-BA). We used this model to study the effect of nickel complexes of L-histidine, GSH or L-cysteine on the hydroxylation of BA. The concentration-dependent effect of L-histidine, GSH and L-cysteine, or nickel on the hydroxylation of BA was studied. The hydroxylation of BA was significantly enhanced up to 1:0.5 molar ratio (Ni:hist or GSH). However, beyond 1:0.5 molar ratios, histidine/GSH inhibited the hydroxylation and complete inhibition was observed at 1:1 molar ratios. Sorbitol and caffeic acid, considered as scavengers of hydroxyl radicals, inhibited nickel-induced hydroxylation of BA. The present study demonstrates paradoxical behaviour of these bioligands. They act as pro-oxidant at lower ligand ratios and as antioxidant at higher ligand ratios. The redox properties of nickel complexes with histidine, GSH or cysteine reported here may be crucial for the toxicity of nickel.
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Joshi S, Hasan SK, Chandra R, Husain MM, Srivastava RC. Scavenging action of zinc and green tea polyphenol on cisplatin and nickel induced nitric oxide generation and lipid peroxidation in rats. Biomed Environ Sci 2004; 17:402-409. [PMID: 15745244] [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: 05/24/2023]
Abstract
OBJECTIVE Toxic metal ions have been implicated in the generation of reactive oxygen species (ROS) and nitric oxide (NO). Metallothionines (MT) and plant flavonoids have been reported in the intervention against oxidative damage. We investigated the effect of zinc induced MT and green tea polyphenol (GTP) in reducing the oxidative responses induced by nickel and platinum. METHODS Zinc (10 mg/kg b. wt, sc) was administered to rats twice at a gap of 24 hrs and GTP (10 mg/100 mL in drinking water) was fed ad libitum for 8 days. Nickel chloride (150 umol/kgb.wt, ip) and cisplatin (50 mumol/kg b.wt, sc) was administered to rats 24 h after Zn or GTP pre-treatment. Animals of all the groups were sacrificed 16 hrs after treatment and biochemical markers for toxicity were monitored. RESULTS Zinc or GTP pre-treatment caused significant protection against nickel or cisplatin enhanced mortality in rats, and reduction in lipid peroxidation and NO. CONCLUSION It is proposed that inhibition of ROS and NO by GTP and zinc may prove useful as a selective pharmacological agent in the amelioration of metal toxicity.
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Affiliation(s)
- Seema Joshi
- Industrial Toxicology Research Centre, P O. Box. 80, M. G. Marg, Lucknow 226 001, India
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Abstract
BACKGROUND AND OBJECTIVE Target-controlled infusions of anaesthetic agents have become increasingly available. They can involve the use of propofol in combination with an opioid or a benzodiazepine. The effect site concentration of propofol infusions has been advocated as a method of estimating drug distribution. We investigated the influence of co-induction with remifentanil and midazolam on effect site propofol requirements at induction of anaesthesia using target-controlled infusions. METHODS Sixty-six consenting adult patients were randomly allocated to three treatment groups. Each group received induction of anaesthesia with a different total intravenous technique. One group was induced with target-controlled propofol alone; another received target-controlled propofol and target-controlled remifentanil (3 ng mL-1); and the last received midazolam (0.03 mg kg-1), target-controlled remifentanil (3 ng mL-1) and target-controlled propofol. Computer simulation was used to calculate effect site concentrations. We recorded propofol dose and effect site concentration at loss of verbal response. RESULTS The effect site concentration (Ce50) of propofol alone was 2.19 micrograms mL-1. This was reduced to 1.55 micrograms mL-1 during co-induction with remifentanil and further reduced to 0.64 microgram mL-1 with midazolam premedication (P < 0.001; ANOVA). CONCLUSIONS We conclude that co-induction with remifentanil alone or with midazolam can be used to reduce propofol doses at induction of anaesthesia using target-controlled infusions. We believe that using effect site concentration may prove a useful tool in routine clinical practice.
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Affiliation(s)
- D H Conway
- Manchester Royal Infirmary, Department of Anaesthesia, Manchester, M13 9WL, UK.
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14
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Abstract
Trigonella foenum-graecum (Fenugreek) (Leguminosae) is employed as a herbal medicine. Its seeds are known for their carminative, tonic and antidiabetic effects. A curative dose of Trigonella foenum-graecum also produces antiulcer action. In this study we have investigated the hypoglycaemic activities of the aqueous extract of the seeds Trigonella foenum-graecum in normal mice using oral route of adminstration. The methanolic extract administered through the same route produced hypoglycaemic effect only at the dose of 1 g/kg body weight. The aqueous extract is under further investigation to determine the chemical structure of the active component. The presence of hypoglycaemic activity in aqueous and methanolic extract indicates that the active compounds are polar in nature.
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Affiliation(s)
- T Zia
- Department of Biochemistry, University of Karachi, 75270, Karachi, Pakistan
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15
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Srivastava RC, Husain MM, Hasan SK, Athar M. Green tea polyphenols and tannic acid act as potent inhibitors of phorbol ester-induced nitric oxide generation in rat hepatocytes independent of their antioxidant properties. Cancer Lett 2000; 153:1-5. [PMID: 10779623 DOI: 10.1016/s0304-3835(99)00400-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The deleterious effects of excessive release of nitric oxide (NO) have been implicated in the tissue damage and inflammation. In this study, the effect of various flavonoids and other oxidant scavenging chemical agents have been studied for their ability to inhibit 12-O-tetradecanoyl phorbol 13-acetate (TPA)-induced NO generation in rat hepatocyte. Hepatocytes activated with TPA (25-200 nM) released NO in a concentration- and time-dependent manner. Green tea polyphenols (GTP) and tannic acid (TA) were most effective in inhibiting TPA-induced NO generation (90%). These agents were also effective in inhibiting NO formation when added 2 h following TPA addition. The other oxidant scavengers, such as L-histidine, sodium azide, vitamin E and sodium benzoate, were not found to be effective even up to 1.0 mM concentration. These results suggest that TA and GTP are potent inhibitors of NOS activity and the inhibition of TPA-induced NO generation by these polyphenols is independent of their antioxidant activity. It is tempting to speculate that these agents could be utilized in the pharmacological manipulations of NO-dependent pathophysiological responses.
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Affiliation(s)
- R C Srivastava
- Industrial Toxicology Research Centre, P.O. Box 80, M.G. Marg, Lucknow, India
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16
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Lúdvíksson BR, Strober W, Nishikomori R, Hasan SK, Ehrhardt RO. Administration of mAb against alpha E beta 7 prevents and ameliorates immunization-induced colitis in IL-2-/- mice. J Immunol 1999; 162:4975-82. [PMID: 10202045] [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: 02/11/2023]
Abstract
We previously demonstrated that 2,4,6-trinitrophenol (TNP)-OVA immunization leads to a transmural colitis in the IL-2-/- mouse that is caused by IL-12-driven CD4+ Th1 T cells and resembles human Crohn's disease. The integrin alpha E beta 7 is highly expressed on colonic intraepithelial lymphocytes and has been suggested to function as a homing or retention molecule for intraepithelial lymphocytes. To evaluate the role of alpha E beta 7 in colitis, we administered a mAb against alpha E beta 7 to IL-2-/- mice that were immunized at the same time with TNP-OVA in CFA. To our surprise, this treatment resulted in a significantly reduced colitis severity score, 0-2 vs 3-4, that was associated with a significant reduction in CD4+ lamina propria lymphocyte subpopulation (p < 0.01). In contrast, the total number of splenic CD4+ T cells of treated animals was significantly elevated compared with that of untreated animals (3.2 +/- 0.6 x 107 vs 1.2 +/- 0.2 x 107; p < 0.05). Similarly, functional studies revealed that IFN-gamma production by lamina propria lymphocytes isolated from IL-2-/- TNP-OVA-immunized mice treated with anti-alpha E beta 7 was significantly lower than in untreated IL-2-/- TNP-OVA-immunized mice. In contrast, IFN-gamma production by splenic cells isolated from treated IL-2-/- TNP-OVA-immunized mice was significantly higher than in untreated mice. Finally, TNP-OVA-immunized IL-2-/- mice that were treated after the colitis had been established also showed a significant decrease in mucosal inflammation after alpha E beta 7 mAb administration. Thus, the above findings demonstrate that the onset and maintenance of inflammatory bowel disease depends on the colonic localization of lamina propria CD4+ lymphocytes expressing alpha E beta 7.
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Affiliation(s)
- B R Lúdvíksson
- Mucosal Immunity Section, Laboratory of Clinical Investigation, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892, USA.
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Srivastava RC, Farookh A, Ahmad N, Misra M, Hasan SK, Husain MM. Evidence for the involvement of nitric oxide in cisplatin-induced toxicity in rats. Biometals 1996; 9:139-42. [PMID: 8744896 DOI: 10.1007/bf00144618] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Cisplatin treatment of rats results into a significant increase in the activity of Ca(2+)-independent nitric oxide synthase (NOS) in kidneys and liver. Significant enhancement of lipid peroxidation in gastric mucosa, kidneys and liver was also observed. The administration of NG-nitro-L-arginine methyl ester, an inhibitor of NOS, markedly reduced renal and gastrointestinal toxicity, and also decreased the content of blood urea nitrogen, serum creatinine, and incidence of diarrhoea along with a significant inhibition in lipid peroxidation in the target organs. The present report, while demonstrating the beneficial effect of the blockade of NO pathways during cisplatin chemotherapy, may be helpful in developing strategies for combating some of the toxic side-effects of the drug.
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Srivastava RC, Gupta S, Ahmad N, Hasan SK, Farookh A, Husain MM. Comparative evaluation of chelating agents on the mobilization of cadmium: a mechanistic approach. J Toxicol Environ Health 1996; 47:173-82. [PMID: 8598573 DOI: 10.1080/009841096161870] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A comparative evaluation of chelating agents, namely, diethyl dithiocarbamate (DDC), dimethyl dithiocarbamate (DMDC), 1,4,8,11-tetraazacyclotetradecane (CYCLAM), 1,4,8,12-tetraazacyclopentadecane (TACPD), 2,3-dimercaptosuccinic acid (DMSA), and 2,3-dimercapto-1-propane sulfonate (DMPS) was conducted to assess their efficacy against acute cadmium (Cd) toxicity. DMSA and DMPS appeared to be most effective in reducing mortality as well as Cd burden of liver, kidneys, and brain in cadmium intoxicated mice. DMDC reduced Cd levels only in liver and kidneys, while DDC significantly enhanced its level in brain. CYCLAM and TACPD significantly increased the Cd level in liver and kidneys and were ineffective in brain. The therapeutic index as well as therapeutic efficacy was highest for DMSA followed by DMPS and DMDC. A fair degree of correlation was found to exist between (1) stability constant of Cd chelates and percent survival (r = .438, (2) stability constant and percent transport (r = .479), and (3) percent survival and percent transport (r =.447). However, the lipophilicity did not show any appreciable correlation with percent survival and stability constant of Cd chelates.
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Srivastava RC, Farookh A, Ahmad N, Misra M, Hasan SK, Husain MM. Reduction of cis-platinum induced nephrotoxicity by zinc histidine complex : the possible implication of nitric oxide. Biochem Mol Biol Int 1995; 36:855-862. [PMID: 8528148] [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: 05/22/2023]
Abstract
Cisplatin is a prominent member of the effective broad spectrum antitumor drugs. The clinical usage of cisplatin is, however, restricted due to some adverse side effects including renal toxicity. The present study demonstrates the protective effect of a Zinc-chelate of histidine, [Zn-Hist], against cisplatin induced nephrotoxicity and gastrointestinal toxicity as shown by decreases in BUN, creatinine and lower incidence of diarrhoea. The observed inhibition in cisplatin induced renal and hepatic lipid peroxidation by [Zn-Hist] pretreatment, suggests an importance for Zn in stabilisation of membrane integrity probably through the displacement of the redox-active metals that may be responsible for inducing peroxidative damage at target sites. The findings also suggest that cisplatin may play biochemical role in arginine-metabolism including nitric oxide (NO) production.
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20
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Srivastava RC, Husain MM, Srivastava SK, Hasan SK, Lal A. Effect of pre-exposure to cadmium and silver on nickel induced toxic manifestations in mice: possible role of ceruloplasmin and metallothionein. Bull Environ Contam Toxicol 1995; 54:751-759. [PMID: 7780220 DOI: 10.1007/bf00206109] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Affiliation(s)
- R C Srivastava
- Industrial Toxicology Research Centre, Mahatma Gandhi Marg, Lucknow, India
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Husain MM, Ahmad N, Gupta S, Behari JR, Hasan SK, Srivastava SK, Srivastava RC. Exacerbation of nickel induced oxidative response by vitamin E. Ind Health 1995; 33:143-152. [PMID: 8543477 DOI: 10.2486/indhealth.33.143] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [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
Vitamin E (alpha-tocopherol), a well known naturally occurring chain breaking antioxidant and a free radical scavenger was found to exacerbate nickel (Ni) toxicity in mice. Vitamin E (Vit. E) mediated enhancement of nickel toxicity was demonstrated by (i) enhanced mortality in mice treated with Ni and Vit. E (ii) increased hepatic lipid peroxidation, (iii) increased rate of benzoate hydroxylation, and (iv) liposomal membrane damage.
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Affiliation(s)
- M M Husain
- Industrial Toxicology Research Centre, Mahatma Gandhi Marg Lucknow, India
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Srivastava RC, Hasan SK, Gupta J, Gupta S. Protective role of metallothionein in nickel induced oxidative damage. Biochem Mol Biol Int 1993; 30:261-70. [PMID: 8364408] [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: 01/30/2023]
Abstract
Recent studies have focussed on the role of thiol rich proteins especially metallothionein (MT) in the therapeutic interventions against oxidative damage. In our previous communication we showed that reactive oxygen species arising via Fenton's reactions are the proximal lipid oxidant during nickel-toxicity. The purpose of the present communication is to evaluate the role of zinc, cadmium or silver-metallothioneins on the protection against nickel-induced peroxidative damage. Our results demonstrate that Zn-MT provided maximum protection against nickel-induced mortality in mice and also served as an efficient antagonist in inhibiting nickel-mediated lipid peroxidation compared to Cd-MT or Ag-MT. Zn-MT also provided protection against iron (II)-ascorbate induced microsomal lipid peroxidation and reversed nickel-mediated inhibition of calcium sequenstration. We conclude that Zn-MT could serve as an excellent physiological antioxidant against nickel-mediated oxidative.
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Abstract
The effect of 1,4,8,11-tetraazacyclotetradecane (Cyclam), triethylenetetramine (TETA), reduced glutathione (GSH), ethylenediamine tetraacetic acid (EDTA), cyclohexanediamine tetraacetic acid (CDTA), diethylene triamine pentaacetic acid (DTPA), and hydroxyethylenediamine triacetic acid (HEDTA) on the alleviation of nickel-induced biochemical and trace-metal alterations in serum, liver, and kidney of nickel-treated rats was studied. The lipophilic chelating agents Cyclam and TETA exhibited a higher order of effectiveness in alleviating nickel-induced alterations compared to EDTA, CDTA, DTPA, and HEDTA, the hydrophilic chelating agents. The higher efficacy of lipophilic agents may be due to their ability to bind to nickel present in extracellular fluid as well as in intracellular fluid, while the hydrophilic agents may bind only to nickel present in extracellular fluid. Our data also suggest that the efficacy of Cyclam to ameliorate nickel-induced alterations is exceptionally high.
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Affiliation(s)
- M Misra
- Industrial Toxicology Research Centre, Lucknow, India
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Srivastava RC, Gupta BN, Athar M, Behari JR, Dwivedi RS, Hasan SK, Bharti RS, Singh A, Misra M, Ray PK. Effect of exposure to toxic gas on the population of Bhopal: Part III--Assessment of toxic manifestations in humans--haematological and biochemical studies. Indian J Exp Biol 1988; 26:165-72. [PMID: 3397119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Athar M, Hasan SK, Srivastava RC. Evidence for the involvement of hydroxyl radicals in nickel mediated enhancement of lipid peroxidation: implications for nickel carcinogenesis. Biochem Biophys Res Commun 1987; 147:1276-81. [PMID: 3663217 DOI: 10.1016/s0006-291x(87)80208-5] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The administration of nickel to rats resulted in enhanced hepatic lipid peroxidation, levels of glutathione and iron with a concomitant decrease in glutathione peroxidase activity. These effects were dose dependent. Enhanced lipid peroxidation was found to be inhibited by the exogenous addition of ethylenediamine tetraacetic acid (EDTA), benzoate and ethanol while catalase and superoxide dismutase were ineffective in this regard. Our data strongly suggest the involvement of hydroxyl radicals in the nickel mediated enhancement of lipid peroxidation which may have their implications in the carcinogenicity of nickel compounds.
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Affiliation(s)
- M Athar
- Industrial Toxicology Research Centre, Lucknow, India
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Athar M, Hasan SK, Srivastava RC. Role of glutathione metabolizing enzymes in nickel mediated induction of hepatic glutathione. Res Commun Chem Pathol Pharmacol 1987; 57:421-4. [PMID: 2890191] [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: 01/03/2023]
Abstract
The administration of nickel to rats resulted in a dose-dependent increase in the level of hepatic glutathione and in the activities of glutathione reductase and glutathione-S-transferase with a concomitant decrease in the activities of glutathione peroxidase and gamma-glutamyl transpeptidase. The increase in hepatic glutathione may be due to the decrease in the activities of glutathione utilizing enzymes and increase in the activity of glutathione reductase leading to the increased turnover of glutathione.
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Affiliation(s)
- M Athar
- Industrial Toxicology Research Centre, Lucknow, India
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Abstract
The effect of single dose of NTA on the removal of radio-manganese in various organs and in plasma has been studied in rats which received single i.v. injection of 54Mn(II). The lowered value of radio-manganese in NTA treated rats as compared to control animal indicates that NTA binds rapidly and forms stable and diffusible complex resulting in the fast excretion of the injected 54Mn(II).
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Abstract
The distribution of 54Mn in various organs of pregnant rats and of their 19-day-old fetuses and in non-pregnant female rats of various ages has been studied 18 h after an i.v. injection of 54MnCl2. The results indicate that early neonates are more susceptible to manganese (Mn) than the growing rats. The localization of 54Mn in liver and brain of the embryo was highly significant.
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Abstract
The production of single strand cleavage in covalently-closed circular-DNA by the antitumour agent streptonigrin (reduced in situ by NADH) is demonstrated using the ethidium bromide fluorescence assay described previously. The degradation dependent on oxygen is completely inhibited by superoxide dismutase (EC 1.15.1.1) suggesting the intermediacy of the superoxide radical anion in the degradation. However similar complete inhibition of DNA strand breakage by catalase (EC 1.11.1.6) indicates that the hydroxyl radical (formed by interaction of superoxide with hydrogen peroxide) is the primary reactive species. Cupric ion stimulates the cleavage reaction and cobaltous ion has no effect in keeping with model studies using quinolinequinones.
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