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Wang Y, Wang J, Yang R, Wang P, Porche R, Kim S, Lutfy K, Liu L, Friedman TC, Jiang M, Liu Y. Decreased 11β-Hydroxysteroid Dehydrogenase Type 2 Expression in the Kidney May Contribute to Nicotine/Smoking-Induced Blood Pressure Elevation in Mice. Hypertension 2021; 77:1940-1952. [PMID: 33813843 DOI: 10.1161/hypertensionaha.120.16458] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- Ying Wang
- Department of Pediatrics, Shanghai Tenth People's Hospital, Tongji University School of Medicine, China (Y.W., R.Y., Y.L.).,Division of Endocrinology, Metabolism and Molecular Medicine, Charles R. Drew University of Medicine and Sciences, Los Angeles, CA (Y.W., J.W., P.W., R.P., S.K., K.L., T.C.F., Y.L.)
| | - Jian Wang
- Division of Endocrinology, Metabolism and Molecular Medicine, Charles R. Drew University of Medicine and Sciences, Los Angeles, CA (Y.W., J.W., P.W., R.P., S.K., K.L., T.C.F., Y.L.).,Department of Neonatology, The First Hospital of Jilin University, Changchun, China (J.W.)
| | - Rong Yang
- Department of Pediatrics, Shanghai Tenth People's Hospital, Tongji University School of Medicine, China (Y.W., R.Y., Y.L.)
| | - Piwen Wang
- Division of Endocrinology, Metabolism and Molecular Medicine, Charles R. Drew University of Medicine and Sciences, Los Angeles, CA (Y.W., J.W., P.W., R.P., S.K., K.L., T.C.F., Y.L.)
| | - Rene Porche
- Division of Endocrinology, Metabolism and Molecular Medicine, Charles R. Drew University of Medicine and Sciences, Los Angeles, CA (Y.W., J.W., P.W., R.P., S.K., K.L., T.C.F., Y.L.)
| | - Samuel Kim
- Division of Endocrinology, Metabolism and Molecular Medicine, Charles R. Drew University of Medicine and Sciences, Los Angeles, CA (Y.W., J.W., P.W., R.P., S.K., K.L., T.C.F., Y.L.)
| | - Kabirullah Lutfy
- Division of Endocrinology, Metabolism and Molecular Medicine, Charles R. Drew University of Medicine and Sciences, Los Angeles, CA (Y.W., J.W., P.W., R.P., S.K., K.L., T.C.F., Y.L.).,College of Pharmacy, Western University of Health Sciences, Pomona, CA (K.L.)
| | - Limei Liu
- Department of Endocrinology and Metabolism, Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai Diabetes Institute, China (L.L.)
| | - Theodore C Friedman
- Division of Endocrinology, Metabolism and Molecular Medicine, Charles R. Drew University of Medicine and Sciences, Los Angeles, CA (Y.W., J.W., P.W., R.P., S.K., K.L., T.C.F., Y.L.).,David Geffen School of Medicine at University of California, Los Angeles (T.C.F., Y.L.)
| | - Meisheng Jiang
- Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California, Los Angeles (M.J.)
| | - Yanjun Liu
- Department of Pediatrics, Shanghai Tenth People's Hospital, Tongji University School of Medicine, China (Y.W., R.Y., Y.L.).,Division of Endocrinology, Metabolism and Molecular Medicine, Charles R. Drew University of Medicine and Sciences, Los Angeles, CA (Y.W., J.W., P.W., R.P., S.K., K.L., T.C.F., Y.L.).,David Geffen School of Medicine at University of California, Los Angeles (T.C.F., Y.L.)
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2
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Behl M, Rao D, Aagaard K, Davidson TL, Levin ED, Slotkin TA, Srinivasan S, Wallinga D, White MF, Walker VR, Thayer KA, Holloway AC. Evaluation of the association between maternal smoking, childhood obesity, and metabolic disorders: a national toxicology program workshop review. ENVIRONMENTAL HEALTH PERSPECTIVES 2013; 121:170-80. [PMID: 23232494 PMCID: PMC3569686 DOI: 10.1289/ehp.1205404] [Citation(s) in RCA: 102] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Accepted: 12/04/2012] [Indexed: 05/15/2023]
Abstract
BACKGROUND An emerging literature suggests that environmental chemicals may play a role in the development of childhood obesity and metabolic disorders, especially when exposure occurs early in life. OBJECTIVE Here we assess the association between these health outcomes and exposure to maternal smoking during pregnancy as part of a broader effort to develop a research agenda to better understand the role of environmental chemicals as potential risk factors for obesity and metabolic disorders. METHODS PubMed was searched up to 8 March 2012 for epidemiological and experimental animal studies related to maternal smoking or nicotine exposure during pregnancy and childhood obesity or metabolic disorders at any age. A total of 101 studies-83 in humans and 18 in animals-were identified as the primary literature. DISCUSSION Current epidemiological data support a positive association between maternal smoking and increased risk of obesity or overweight in offspring. The data strongly suggest a causal relation, although the possibility that the association is attributable to unmeasured residual confounding cannot be completely ruled out. This conclusion is supported by findings from laboratory animals exposed to nicotine during development. The existing literature on human exposures does not support an association between maternal smoking during pregnancy and type 1 diabetes in offspring. Too few human studies have assessed outcomes related to type 2 diabetes or metabolic syndrome to reach conclusions based on patterns of findings. There may be a number of mechanistic pathways important for the development of aberrant metabolic outcomes following perinatal exposure to cigarette smoke, which remain largely unexplored. CONCLUSIONS From a toxicological perspective, the linkages between maternal smoking during pregnancy and childhood overweight/obesity provide proof-of-concept of how early-life exposure to an environmental toxicant can be a risk factor for childhood obesity.
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Affiliation(s)
- Mamta Behl
- Kelly Government Solutions, Research Triangle Park, North Carolina, USA
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3
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Xu TY, Guo LL, Wang P, Song J, Le YY, Viollet B, Miao CY. Chronic exposure to nicotine enhances insulin sensitivity through α7 nicotinic acetylcholine receptor-STAT3 pathway. PLoS One 2012; 7:e51217. [PMID: 23251458 PMCID: PMC3520975 DOI: 10.1371/journal.pone.0051217] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2012] [Accepted: 10/31/2012] [Indexed: 11/18/2022] Open
Abstract
This study was to investigate the effect of nicotine on insulin sensitivity and explore the underlying mechanisms. Treatment of Sprague-Dawley rats with nicotine (3 mg/kg/day) for 6 weeks reduced 43% body weight gain and 65% blood insulin level, but had no effect on blood glucose level. Both insulin tolerance test and glucose tolerance test demonstrated that nicotine treatment enhanced insulin sensitivity. Pretreatment of rats with hexamethonium (20 mg/kg/day) to antagonize peripheral nicotinic receptors except for α7 nicotinic acetylcholine receptor (α7-nAChR) had no effect on the insulin sensitizing effect of nicotine. However, the insulin sensitizing effect but not the bodyweight reducing effect of nicotine was abrogated in α7-nAChR knockout mice. Further, chronic treatment with PNU-282987 (0.53 mg/kg/day), a selective α7-nAChR agonist, significantly enhanced insulin sensitivity without apparently modifying bodyweight not only in normal mice but also in AMP-activated kinase-α2 knockout mice, an animal model of insulin resistance with no sign of inflammation. Moreover, PNU-282987 treatment enhanced phosphorylation of signal transducer and activator of transcription 3 (STAT3) in skeletal muscle, adipose tissue and liver in normal mice. PNU-282987 treatment also increased glucose uptake by 25% in C2C12 myotubes and this effect was total abrogated by STAT3 inhibitor, S3I-201. All together, these findings demonstrated that nicotine enhanced insulin sensitivity in animals with or without insulin resistance, at least in part via stimulating α7-nAChR-STAT3 pathway independent of inflammation. Our results contribute not only to the understanding of the pharmacological effects of nicotine, but also to the identifying of new therapeutic targets against insulin resistance.
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Affiliation(s)
- Tian-Ying Xu
- Department of Pharmacology, Second Military Medical University, Shanghai, China
| | - Ling-Ling Guo
- Department of Pharmacology, Second Military Medical University, Shanghai, China
| | - Pei Wang
- Department of Pharmacology, Second Military Medical University, Shanghai, China
| | - Jie Song
- Department of Pharmacology, Second Military Medical University, Shanghai, China
| | - Ying-Ying Le
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Benoit Viollet
- Institut Cochin, Université Paris Descartes, CNRS (UMR8104), Paris, France
- Inserm, U567, Paris, France
| | - Chao-Yu Miao
- Department of Pharmacology, Second Military Medical University, Shanghai, China
- * E-mail:
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4
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Swislocki ALM, Fakiri Z. Smokeless Nicotine Exposure Has No Lasting Effect on Fasting or Postglucose Circulation Leptin in Young Rats. Metab Syndr Relat Disord 2008; 6:257-62. [DOI: 10.1089/met.2008.0017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Arthur L. M. Swislocki
- Medical Service, Department of Veterans Affairs Northern California Health Care System, and the Department of Internal Medicine, University of California, Davis School of Medicine, Davis, California
| | - Zarlasht Fakiri
- Medical Service, Department of Veterans Affairs Northern California Health Care System, and the Department of Internal Medicine, University of California, Davis School of Medicine, Davis, California
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5
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Ferrari MFR, Fior-Chadi DR. Chronic nicotine administration. Analysis of the development of hypertension and glutamatergic neurotransmission. Brain Res Bull 2006; 72:215-24. [PMID: 17452284 DOI: 10.1016/j.brainresbull.2006.09.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2006] [Revised: 09/13/2006] [Accepted: 09/15/2006] [Indexed: 11/27/2022]
Abstract
Among numerous neurotransmitters involved in central cardiovascular control, glutamate is one of the most studied transmitters that are related to nicotine considering its release and its postsynaptic regulation. However, there are no conclusive studies about nicotine effects on glutamatergic system and its relevance on hypertension development, which can help to understand the role of these two systems in that pathology. In this context, the objective of the present study is to evaluate the effects of systemic chronic nicotine exposure on hypertension development as well as the interaction between nicotine and the glutamatergic system in normotensive and neurogenic hypertensive rats. By means of high performance liquid chromatograph, immunohistochemistry, in situ hybridization and binding techniques, glutamatergic system was evaluated in SHR and Wistar Kyoto (WKY) rats treated with nicotine, delivered subcutaneously through nicotine pellets, for 8 weeks. The most important findings in this study were that (1) moderate doses of nicotine accelerated the onset and increased blood pressure in SHR but not in WKY rats, (2) the nicotine dosage and time of treatment employed did not affect body weight, (3) chronic nicotine treatment differentially affected glutamatergic system in normotensive and hypertensive rats, and (4) spontaneously hypertensive rats seem to be more sensitive to peripherally administered nicotine than Wistar Kyoto rats considering blood pressure and glutamatergic neurotransmission changes. In conclusion, we have demonstrated that a moderate dose of nicotine accelerates the onset and exacerbates hypertension in the SHR and that might be, at least in part, related to the modulation of glutamatergic neurotransmission.
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Affiliation(s)
- Merari F R Ferrari
- Department of Physiology, Institute of Biosciences, University of São Paulo, Rua do Matão, Travessa 14, n.321, Cidade Universitária-São Paulo, SP 05508-090, Brazil
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Gletsu N, Doan TN, Cole J, Sutliff RL, Bernstein KE. Angiotensin II-induced hypertension in mice caused an increase in insulin secretion. Vascul Pharmacol 2005; 42:83-92. [PMID: 15792925 DOI: 10.1016/j.vph.2005.01.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
OBJECTIVE AND DESIGN Insulin action was determined in a mouse model of human hypertension via chronic angiotensin II administration followed by a glucose tolerance test. METHODS Angiotensin II or saline was infused systemically into mice via osmotic pump for 2 or 4 weeks. In angiotensin II-treated mice versus saline controls we compared blood pressure, blood glucose, and serum insulin concentrations during an intravenous glucose tolerance test and assessed glucose transport and insulin signaling in muscle. RESULTS Blood pressure increased at 2 and 4 weeks following angiotensin II treatment. Mice treated with angiotensin II for 4 weeks cleared a glucose bolus faster than mice treated with saline despite similar basal serum insulin concentrations. Upon glucose administration, the increase in serum insulin was greater in angiotensin II-treated mice, 38.8+/-6.5 pmol/l, compared to saline-treated mice, 21.8+/-2.9 pmol/l, but only at 4 weeks of angiotensin II treatment while no difference was observed at 2 weeks of angiotensin II administration. At 4 weeks of angiotensin II treatment, insulin signaling in the liver and in the skeletal muscle was not affected, since both the number of insulin receptors and phosphorylation of Akt were unchanged. Also at 4 weeks of angiotensin II treatment, ex vivo soleus muscle did not exhibit any change in basal and insulin-stimulated glucose uptake. CONCLUSIONS This study suggests that long-term angiotensin II treatment for 4 weeks enhances glucose-stimulated insulin secretion in mice. Angiotensin II-induced hyperinsulinemia may play a role in the development of insulin resistance in patients with hypertension.
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Affiliation(s)
- Nana Gletsu
- Department of Pathology and Experimental Medicine, Emory University School of Medicine, Room 7107A, 1639 Pierce Drive, Atlanta, Georgia 30322, USA
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Morgan TM, Crawford L, Stoller A, Toth D, Yeo KTJ, Baron JA. Acute effects of nicotine on serum glucose insulin growth hormone and cortisol in healthy smokers. Metabolism 2004; 53:578-82. [PMID: 15131760 DOI: 10.1016/j.metabol.2003.12.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Cigarette smoking impairs glucose tolerance and alters serum levels of hormones involved in glucose metabolism, but the role of nicotine in such hormonal alterations is not well understood. In order to isolate the effects of transdermal nicotine on serum glucose, insulin, growth hormone, and cortisol in smokers, we conducted a randomized double-blind placebo-controlled cross-over study involving 34 healthy volunteer smokers between 18 and 55 years of age. Administration of a 14-mg transdermal nicotine patch resulted in nonsignificantly lowered fasting quantitative insulin-sensitivity index (P =.11) and a nonsignificant 9.3-mg/dL mean increase in serum glucose levels during a 75-g oral glucose tolerance test (OGTT) at time 60 minutes (P =.12). There were no substantial differences between groups in the areas under the curve (AUCs) for glucose (P =.33) or insulin (P =.79) during the OGTT. Levels of insulin and cortisol also were not significantly altered by nicotine. A secondary finding observed in the overall study group (primarily in females) was that nicotine caused a 29% median decrease in serum growth hormone (P =.02). We conclude that nicotine patches may lead to mild hyperglycemia and lowered insulin sensitivity. Further research is needed to determine the clinical implications of the unexpected finding that nicotine decreased growth hormone levels in female smokers.
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Affiliation(s)
- Thomas M Morgan
- Dartmouth Medical School and Dartmouth-Hitchcock Medical Center, Hannover, NH, USA
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8
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Swislocki ALM. Smokeless nicotine administration does not result in hypertension or a deterioration in glucose tolerance or insulin sensitivity in juvenile rats. Metabolism 2003; 52:67-72. [PMID: 12524664 DOI: 10.1053/meta.2003.50006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We have previously reported that smokeless nicotine resulted in hypertension, but not a deterioration in glucose tolerance or insulin action in young adult male rats. To evaluate the effect of nicotine in juvenile animals, we studied 6-week-old male and female Sprague-Dawley rats and implanted 25-mg nicotine (N) or placebo (P) pellets. Weight gain was controlled by chow restriction in all 4 groups of rats. Males were generally heavier than females, both before and after N or P placement; there was no difference in weight between N and P groups for each sex. Systolic blood pressure, measured noninvasively, increased modestly, but not significantly, after N placement in both male and female rats. Glucose tolerance and insulin action were assessed by an oral glucose tolerance test (OGTT). Areas under the curve (AUC) were calculated for glucose (AUC(GLU)), insulin (AUC(INS)), and free fatty acids (FFA) (AUC(FFA)). Insulin action was calculated by several indices, which have correlated with more invasive studies. None of these metabolic parameters were significantly impacted by nicotine treatment, consistent with our observations in adult male rats. In summary, smokeless nicotine at this dose has no significant effect on observed cardiovascular or metabolic parameters in sexually immature male and female rats.
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Affiliation(s)
- A L M Swislocki
- Medical Service, Department of Veterans Affairs Northern California Health Care System, UC Davis School of Medicine, 94553, USA
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9
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Liu RH, Mizuta M, Matsukura S. Long-term oral nicotine administration reduces insulin resistance in obese rats. Eur J Pharmacol 2003; 458:227-34. [PMID: 12498930 DOI: 10.1016/s0014-2999(02)02726-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study aimed to investigate the effect of long-term oral nicotine administration on insulin resistance in an animal model of obesity. Eight-week-old male Zucker fatty rats (ZFRs) were administered nicotine tartrate dihydrate (4.6 mg/kg/day) in the drinking water. The control group was pair-fed. The body weights and food intake over 8 weeks were similar in both groups. Plasma glucose levels at 3, 6, 9, 12, and 15 min after insulin administration (0.5 U/kg) in the nicotine group were significantly lower than those in the control group. The calculated K(ITT) value for the nicotine group was significantly higher than that for the control group. Wet weight of the liver in the nicotine group was significantly lower than that in the control group. Transaminases and histological examination of the liver revealed no alteration by nicotine administration. Glycogen, glycogen synthetase activity and gluconeogenesis in the liver in the nicotine group were significantly lower than those in the control group. Phosphorylase-a activity of the liver in the nicotine group was significantly higher than that in the control group. Glycogen, glycogen synthetase, and phosphorylase-a activity of skeletal muscle were similar in both groups. These results suggest that long-term oral nicotine administration may reduce insulin resistance in obese diabetic rats through a reduced hepatic glucose release and, in part, contribute to lowering blood glucose levels.
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Affiliation(s)
- Run Hua Liu
- Third Department of Internal Medicine, Miyazaki Medical College, 5200 Kihara, Kiyotake, 889-1692, Miyazaki, Japan
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Abdelfatah AB, Motte G, Ducloux D, Chalopin JM. Determinants of mean arterial pressure and pulse pressure in chronic haemodialysis patients. J Hum Hypertens 2001; 15:775-9. [PMID: 11687921 DOI: 10.1038/sj.jhh.1001273] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2000] [Revised: 06/19/2001] [Accepted: 06/19/2001] [Indexed: 11/09/2022]
Abstract
Hypertension is highly prevalent in the dialysis population, and has been implicated in the pathogenesis of the observed excess of cardiovascular morbidity and mortality in these patients. Nevertheless, there are no reports on the clinical and biochemical determinants of both pulse pressure (PP) and mean arterial pressure (MAP) in dialysis populations. A total of 541 haemodialysed patients from 11 dialysis centres were included in the study. The demographic, clinical, and biological characteristics were recorded. Both pre- and post- dialytic blood pressures (systolic and diastolic) were measured. PP and MAP were calculated. Mean predialytic PP was 67 +/- 17 mm Hg and significantly decreased after dialysis (60 +/- 18 mm Hg; P < 0.0001). In multivariate analysis, a 10 mm Hg increase in PP was positively associated with age (RR, 2.01; 95% CI, 1.35-5.01, for a 10-year increase in age), diabetes mellitus (RR, 1.08; 95% CI, 1.04-1.14), interdialytic weight gain (IWG) (RR, 1.84; 95% CI, 1.07-3.18, for 1% increase in IWG), and current smoking (RR, 2.59; 95% CI, 1.13-5.92) and negatively with Hb concentration (RR, 0.92; 95% CI, 0.84-0.99, for a 1 g/100 ml in Hb). Mean predialytic MAP was 98 +/- 15 mm Hg and significantly decreased after dialysis (91 +/- 16 mm Hg; P < 0.0001). In multivariate analysis, a 10 mm Hg increase in MAP was positively associated with parathyroid hormone (PTH) (RR, 1.32; 95% CI, 1.15-1.6, for 50 ng/ml in PTH), erythropoietin (EPO) treatment (RR, 1.09; 95% CI, 1.03-1.16), and current smoking (RR, 1.87; 95% CI, 1.39-2.41). PP and MAP are associated with different clinical parameters. Most of these factors are potentially reversible. Smoking cessation, correction of anaemia and limitation of IWG should be important challenges for physicians in care of dialysis patients.
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Affiliation(s)
- A B Abdelfatah
- Department of Nephrology, Dialysis, and Renal Transplantation, Saint Jacques Hospital, Besançon, France
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Helen A, Krishnakumar K, Vijayammal PL, Augusti KT. Antioxidant effect of onion oil (Allium cepa. Linn) on the damages induced by nicotine in rats as compared to alpha-tocopherol. Toxicol Lett 2000; 116:61-8. [PMID: 10906423 DOI: 10.1016/s0378-4274(00)00208-3] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The beneficial effects of onion oil as an antioxidant has been assessed in nicotine administered rats by studying whether the peroxidative damage caused by nicotine can be effectively combated with the onion oil and the effects compared to vitamin E, a highly efficient antioxidant. Lipid peroxidation products and antioxidant defence system have been studied in liver, lungs, and heart. The rats were injected with nicotine (0.6 mg/kg body wt.) and simultaneously given onion oil (100 mg/kg body wt.) or vitamin E (100 mg/kg body wt.) for 21 days. Concentration of free fatty acids, TBA reactive substances (TBARS), conjugated dienes and hydroperoxides were significantly increased in the tissues of nicotine treated rats as compared to normal rats. Onion oil supplemented to nicotine treated rats showed increased resistance to lipid peroxidation and the effect was near to that of vitamin E fed rats. The activity of catalase and superoxide dismutase decreased in nicotine treated rats. Antioxidants-glutathione content, vitamin C and retinol showed no significant difference but liver vitamin E content significantly decreased in nicotine treated rats. On onion oil or vitamin E supplementation, the concentration of antioxidants were significantly raised in all the tissues studied, however, a significantly increased concentration of glutathione, vitamin E and retinol was noticed in vitamin E+nicotine treated rats. Thus, these results indicate that onion oil is an effective antioxidant against the oxidative damage caused by nicotine as compared to vitamin E.
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Affiliation(s)
- A Helen
- Department of Biochemistry, University of Kerala, Kariavattom, Thiruvananthapuram, India
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