Effects of diabetes, insulin and antioxidants on NO synthase abundance and NO interaction with reactive oxygen species

被引:76
作者
Koo, JR
Vaziri, ND
机构
[1] Univ Calif Irvine, Dept Med, Div Nephrol & Hypertens, Irvine, CA 92717 USA
[2] Hallym Univ, Chunchon Sacred Heart Hosp, Dept Med, Kangwon Do, South Korea
关键词
diabetes; oxidative stress; nitric oxide; carboxymethyllysine; lipid peroxides; nitrotyrosine;
D O I
10.1046/j.1523-1755.2003.00728.x
中图分类号
R5 [内科学]; R69 [泌尿科学(泌尿生殖系疾病)];
学科分类号
1002 ; 100201 ;
摘要
Background. Earlier studies have provided evidence for increased production of reactive oxygen species (ROS) and altered nitric oxide (NO) metabolism in diabetes. This study was intended to explore the effect of type I diabetes and its treatment with insulin alone or insulin plus antioxidant-fortified diet on expression of NOS isoforms and ROS interactions with lipids, glucose and NO. Methods. Rats with streptozotocin-induced diabetes were divided into once-daily insulin (ultralente)-treated, insulin plus antioxidant (vitamin E and vitamin C)-treated and untreated groups. After four weeks, plasma malondialdehyde (MDA) and tissue endothelial (eNOS), neuronal (nNOS) NO synthases, carboxymethyllysine (CML) and nitrotyrosine were determined. Results. The untreated diabetic animals exhibited severe hyperglycemia, elevated blood pressure, increased plasma MDA, high tissue CML and reduced tissue nitrotyrosine denoting enhanced lipid, glucose and protein oxidation but reduced NO oxidation by ROS. This was coupled with significant reduction of eNOS and nNOS expression in renal cortex and eNOS in the left ventricle. Insulin therapy partially lowered blood pressure, tissue CML, plasma glucose and MDA, but significantly raised eNOS expression and nitrotyrosine abundance to supranormal levels. Combined insulin and antioxidant therapies resulted in normalization of blood pressure, plasma MDA, tissue CML and nitrotyrosine without affecting glucose level or NOS expression. Conclusion. Oxidative stress in untreated diabetes is associated with down-regulation of NOS isoforms and increased ROS-mediated oxidation of lipid and glucose, but not NO. Amelioration of hyperglycemia with once-daily insulin administration alone results in up-regulation of NOS isoforms, reduction of lipid and glucose oxidation and increased NO oxidation. However, insulin plus antioxidant supplementation can normalize all three parameters.
引用
收藏
页码:195 / 201
页数:7
相关论文
共 41 条
  • [1] APPARENT HYDROXYL RADICAL PRODUCTION BY PEROXYNITRITE - IMPLICATIONS FOR ENDOTHELIAL INJURY FROM NITRIC-OXIDE AND SUPEROXIDE
    BECKMAN, JS
    BECKMAN, TW
    CHEN, J
    MARSHALL, PA
    FREEMAN, BA
    [J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1990, 87 (04) : 1620 - 1624
  • [2] What is oxidative stress?
    Betteridge, DJ
    [J]. METABOLISM-CLINICAL AND EXPERIMENTAL, 2000, 49 (02): : 3 - 8
  • [3] Ceriello A, 2001, DIABETOLOGIA, V44, P834
  • [4] Cosentino F, 1997, CIRCULATION, V96, P25
  • [5] Effects of simulated hyperglycemia, insulin, and glucagon on endothelial nitric oxide synthase expression
    Ding, YX
    Vaziri, ND
    Coulson, R
    Kamanna, VS
    Roh, DD
    [J]. AMERICAN JOURNAL OF PHYSIOLOGY-ENDOCRINOLOGY AND METABOLISM, 2000, 279 (01): : E11 - E17
  • [6] Treatment of hypertension with ascorbic acid
    Duffy, SJ
    Gokce, N
    Holbrook, M
    Huang, A
    Frei, B
    Keaney, JF
    Vita, JA
    [J]. LANCET, 1999, 354 (9195) : 2048 - 2049
  • [7] Gabbai FB, 1999, SEMIN NEPHROL, V19, P242
  • [8] IMPROVING INSULIN THERAPY - ACHIEVEMENTS AND CHALLENGES
    GALLOWAY, JA
    CHANCE, RE
    [J]. HORMONE AND METABOLIC RESEARCH, 1994, 26 (12) : 591 - 598
  • [9] Lead-induced hypertension - Interplay of nitric oxide and reactive oxygen species
    Gonick, HC
    Ding, YX
    Bondy, SC
    Ni, ZM
    Vaziri, ND
    [J]. HYPERTENSION, 1997, 30 (06) : 1487 - 1492
  • [10] PEROXYNITRITE MODIFICATION OF LOW-DENSITY-LIPOPROTEIN LEADS TO RECOGNITION BY THE MACROPHAGE SCAVENGER RECEPTOR
    GRAHAM, A
    HOGG, N
    KALYANARAMAN, B
    OLEARY, V
    DARLEYUSMAR, V
    MONCADA, S
    [J]. FEBS LETTERS, 1993, 330 (02) : 181 - 185