Relationship between insulin resistance and lipid peroxidation and antioxidant vitamins in hypercholesterolemic patients

Min-Jeong Shin, Eunju Park, Jong H. Lee, Namsik Chung

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Background: Several studies have reported that insulin resistance and compensatory hyperinsulinemia increased lipid peroxidation, suggesting the linking to each other. We investigated the relationships between insulin resistance index HOMA-IR and lipid peroxidation, plasma antioxidant status in non-diabetic, hypercholesterolemic patients. Methods: We measured the urinary excretion of 8-epi-prostaglandin F(PGF ) levels as a measure of lipid peroxidation in vivo, total radical trapping antioxidant potential (TRAP) and fat-soluble antioxidant vitamins in 76 non-diabetic subjects with hypercholesterolemia (mean age 59 years, 25 males and 51 females). Insulin resistance was evaluated by homeostasis model assessment (HOMA-IR) derived from fasting glucose and insulin concentrations. Results: HOMA-IR was positively correlated with the urinary excretion of PGF (r = 0.222, p < 0.05) and negatively correlated with the TRAP (r = -0.211, p < 0.05) in total subjects. Furthermore, there were significant inverse relationships between HOMA-IR and lipid corrected fat-soluble vitamins such as β-carotene (r = -0.297, p < 0.01) and γ-tocopherol (r = -0.243, p < 0.05) and also significant inverse relation was found between lipid corrected β-carotene and the urinary PGFexcretion (r = -0.205, p < 0.05). When total subjects were divided into three groups according to tertiles of HOMA-IR, significant differences in urinary PGF2αexcretion (p < 0.05) and lipid corrected β-carotene (p < 0.005) among the three groups were observed. The highest HOMA-IR group had the higher levels of urinary PGFexcretion and lower levels of plasma β-carotene compared with the lowest HOMA-IR group. Conclusion: Our data showed that the insulin resistance of hypercholesterolemic patients increased oxidative stress and negatively influenced plasma antioxidant system. These results provide evidence in understanding mechanism linking insulin resistance and oxidative stress accompanied by reduced antioxidant system.

Original languageEnglish
Pages (from-to)115-120
Number of pages6
JournalAnnals of Nutrition and Metabolism
Volume50
Issue number2
DOIs
Publication statusPublished - 2006 Feb 1
Externally publishedYes

Fingerprint

Vitamins
Lipid Peroxidation
Insulin Resistance
Antioxidants
Carotenoids
Dinoprost
Lipids
Oxidative Stress
Fats
Tocopherols
Hyperinsulinism
Hypercholesterolemia
Fasting
Homeostasis
Insulin
Glucose

Keywords

  • Antioxidant
  • Hypercholesterolemia
  • Insulin resistance
  • Lipid peroxidation

ASJC Scopus subject areas

  • Endocrinology
  • Medicine (miscellaneous)
  • Endocrinology, Diabetes and Metabolism

Cite this

Relationship between insulin resistance and lipid peroxidation and antioxidant vitamins in hypercholesterolemic patients. / Shin, Min-Jeong; Park, Eunju; Lee, Jong H.; Chung, Namsik.

In: Annals of Nutrition and Metabolism, Vol. 50, No. 2, 01.02.2006, p. 115-120.

Research output: Contribution to journalArticle

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N2 - Background: Several studies have reported that insulin resistance and compensatory hyperinsulinemia increased lipid peroxidation, suggesting the linking to each other. We investigated the relationships between insulin resistance index HOMA-IR and lipid peroxidation, plasma antioxidant status in non-diabetic, hypercholesterolemic patients. Methods: We measured the urinary excretion of 8-epi-prostaglandin F2α(PGF 2α) levels as a measure of lipid peroxidation in vivo, total radical trapping antioxidant potential (TRAP) and fat-soluble antioxidant vitamins in 76 non-diabetic subjects with hypercholesterolemia (mean age 59 years, 25 males and 51 females). Insulin resistance was evaluated by homeostasis model assessment (HOMA-IR) derived from fasting glucose and insulin concentrations. Results: HOMA-IR was positively correlated with the urinary excretion of PGF2α (r = 0.222, p < 0.05) and negatively correlated with the TRAP (r = -0.211, p < 0.05) in total subjects. Furthermore, there were significant inverse relationships between HOMA-IR and lipid corrected fat-soluble vitamins such as β-carotene (r = -0.297, p < 0.01) and γ-tocopherol (r = -0.243, p < 0.05) and also significant inverse relation was found between lipid corrected β-carotene and the urinary PGF2αexcretion (r = -0.205, p < 0.05). When total subjects were divided into three groups according to tertiles of HOMA-IR, significant differences in urinary PGF2αexcretion (p < 0.05) and lipid corrected β-carotene (p < 0.005) among the three groups were observed. The highest HOMA-IR group had the higher levels of urinary PGF2αexcretion and lower levels of plasma β-carotene compared with the lowest HOMA-IR group. Conclusion: Our data showed that the insulin resistance of hypercholesterolemic patients increased oxidative stress and negatively influenced plasma antioxidant system. These results provide evidence in understanding mechanism linking insulin resistance and oxidative stress accompanied by reduced antioxidant system.

AB - Background: Several studies have reported that insulin resistance and compensatory hyperinsulinemia increased lipid peroxidation, suggesting the linking to each other. We investigated the relationships between insulin resistance index HOMA-IR and lipid peroxidation, plasma antioxidant status in non-diabetic, hypercholesterolemic patients. Methods: We measured the urinary excretion of 8-epi-prostaglandin F2α(PGF 2α) levels as a measure of lipid peroxidation in vivo, total radical trapping antioxidant potential (TRAP) and fat-soluble antioxidant vitamins in 76 non-diabetic subjects with hypercholesterolemia (mean age 59 years, 25 males and 51 females). Insulin resistance was evaluated by homeostasis model assessment (HOMA-IR) derived from fasting glucose and insulin concentrations. Results: HOMA-IR was positively correlated with the urinary excretion of PGF2α (r = 0.222, p < 0.05) and negatively correlated with the TRAP (r = -0.211, p < 0.05) in total subjects. Furthermore, there were significant inverse relationships between HOMA-IR and lipid corrected fat-soluble vitamins such as β-carotene (r = -0.297, p < 0.01) and γ-tocopherol (r = -0.243, p < 0.05) and also significant inverse relation was found between lipid corrected β-carotene and the urinary PGF2αexcretion (r = -0.205, p < 0.05). When total subjects were divided into three groups according to tertiles of HOMA-IR, significant differences in urinary PGF2αexcretion (p < 0.05) and lipid corrected β-carotene (p < 0.005) among the three groups were observed. The highest HOMA-IR group had the higher levels of urinary PGF2αexcretion and lower levels of plasma β-carotene compared with the lowest HOMA-IR group. Conclusion: Our data showed that the insulin resistance of hypercholesterolemic patients increased oxidative stress and negatively influenced plasma antioxidant system. These results provide evidence in understanding mechanism linking insulin resistance and oxidative stress accompanied by reduced antioxidant system.

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