Circadian variation in oxidative stress markers in healthy and type II diabetic men
| Autor: | Parvez Shirazi, Eugene L. Kanabrocki, M D Ryan, Jane L.H.C. Third, D. Craig Hooper, Gwen S. Scott, Bernard A. Nemchausky, Diana E. Ayala, Ramon C. Hermida, Dennis Murray, W. Fraser Bremner |
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| Rok vydání: | 2002 |
| Předmět: |
Adult
Male medicine.medical_specialty Physiology Population Urine Dinoprost medicine.disease_cause chemistry.chemical_compound Malondialdehyde Physiology (medical) Internal medicine Diabetes mellitus Humans Medicine Circadian rhythm education Nitrites Aged F2-Isoprostanes education.field_of_study Nitrates business.industry Deoxyguanosine Middle Aged medicine.disease Circadian Rhythm Uric Acid Oxidative Stress Endocrinology Diabetes Mellitus Type 2 chemistry 8-Hydroxy-2'-Deoxyguanosine Case-Control Studies Uric acid Analysis of variance business Biomarkers Oxidative stress |
| Zdroj: | Chronobiology International. 19:423-439 |
| ISSN: | 1525-6073 0742-0528 |
| DOI: | 10.1081/cbi-120002914 |
| Popis: | Seven clinically healthy, nondiabetic (ND) and four Type II diabetic (D) men were assessed for circadian rhythms in oxidative "stress markers." Blood samples were collected at 3h intervals for approximately 27 h beginning at 19:00h. Urine samples were collected every 3 h beginning with the 16:00h-19:00h sample. The dark (sleep) phase of the light-dark cycle extended from 22:30h to 06:30h, with brief awakening for sampling at 01:00h and 04:00h. Subjects were offered general hospital meals at 16:30h, 07:30h, and 13:30h (2400 cal in total/24h). Serum samples were analyzed for uric acid (UA) and nitrite (NO) concentrations, and urine samples were assayed for 8-hydroxydeoxyguanosine (8-OHdG), malondialdehyde (MDA), and 8-isoprostane (ISP). Data were analyzed statistically both by the population multiple-components method and by the analysis of variance (ANOVA). The 24h mean level of UA and NO was greater in D than in ND subjects (424 vs. 338 micromol/L and 39.2 vs. 12.7 microM, respectively). A significant circadian rhythm in UA (p = 0.001) and NO (p = 0.048) was evident in ND but not in D (p = 0.214 and 0.065). A circadian rhythm (p = 0.004, amplitude = 8.6 pmol/kgbw/3h urine vol.) was also evident in urine 8-OHdG of ND but not of D. The 24h mean levels of ND and D were comparable (76.8 vs. 65.7 pmol/kgbw/3h urine vol.). No circadian rhythm by population multiple-components was evident in MDA and ISP levels of ND subjects, or in 8-OHdG, MDA, and ISP in D. However, a significant time-effect was demonstrated by ANOVA in all variables and groups. The 24h mean of MDA and ISP in D was significantly greater than in ND (214 vs. 119 nmol/3h urine vol. and 622 vs. 465 ng/3h urine vol.). The peak concentrations of the three oxidative "stress markers" in urine, like those of serum NO, occurred early in the evening in both groups of men. This observation suggests a correlation between increased oxidative damage and increased rate of anabolic-catabolic events as evidenced by similarities in the timing of peak NO production and in parameters relevant to metabolic functions. |
| Databáze: | OpenAIRE |
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