Serum antioxidants and myocardial infarction: Are low levels of carotenoids and α-tocopherol risk factors for myocardial infarction?

Debra A. Street, George W. Comstock, Richard M. Salkeld, Willy Schüep, Michael John Klag

Research output: Contribution to journalArticle

Abstract

Background. In vitro, animal and epidemiological studies suggest that lipoprotein oxidation may play an important role in atherosclerosis. Antioxidants may protect against lipoprotein oxidation and in that way inhibit atherosclerosis and its clinical sequelae. To investigate this possibility, we examined the association between levels of several antioxidants and myocardial infarction using serum specimens collected 7 to 14 years before the onset of myocardial infarction. Methods and Results. A nested case-control design was used. Cases and control subjects were selected from the 25 802 persons who had donated 15 mL of blood in 1974 for a serum bank. Cases comprised 123 persons with a subsequent first diagnosis of myocardial infarction who ranged from 23 through 58 years of age in 1974 and who had had their first diagnosis of myocardial infarction during 1981 to 1988. Two groups of control subjects matched to the cases for sex and age were selected from donors to the serum bank, one from those with hospital admissions during the same period and the other from the total group of donors. Sera were assayed for four carotenoids (β-carotene, lycopene, lutein, and zeaxanthin), α-tocopherol, and cholesterol. Because associations with these serum nutrients showed similar trends whether based on hospital or community controls, the two control groups were combined. There was a significantly increasing risk for subsequent myocardial infarction with decreasing levels of β-carotene in 1974 (P value for trend, .02) and a suggestive trend with decreasing levels of lutein (P=.09). When the results were stratified by smoking status, the excess risk of myocardial infarction associated with low serum levels of carotenoids was limited to smokers. A protective association with higher levels of α-tocopherol was suggested only among persons with high levels of serum cholesterol. Conclusions. Low serum levels of carotenoids were associated with an increased risk of subsequent myocardial infarction among smokers.

Original languageEnglish (US)
Pages (from-to)1154-1161
Number of pages8
JournalCirculation
Volume90
Issue number3
StatePublished - Sep 1994

Fingerprint

Tocopherols
Carotenoids
Antioxidants
Myocardial Infarction
Serum
Lutein
Lipoproteins
Atherosclerosis
Control Groups
Hypercholesterolemia
Epidemiologic Studies
Smoking
Cholesterol
Food

Keywords

  • antioxidants
  • atherosclerosis
  • myocardial infarction

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

Serum antioxidants and myocardial infarction : Are low levels of carotenoids and α-tocopherol risk factors for myocardial infarction? / Street, Debra A.; Comstock, George W.; Salkeld, Richard M.; Schüep, Willy; Klag, Michael John.

In: Circulation, Vol. 90, No. 3, 09.1994, p. 1154-1161.

Research output: Contribution to journalArticle

Street, Debra A. ; Comstock, George W. ; Salkeld, Richard M. ; Schüep, Willy ; Klag, Michael John. / Serum antioxidants and myocardial infarction : Are low levels of carotenoids and α-tocopherol risk factors for myocardial infarction?. In: Circulation. 1994 ; Vol. 90, No. 3. pp. 1154-1161.
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AU - Klag, Michael John

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AB - Background. In vitro, animal and epidemiological studies suggest that lipoprotein oxidation may play an important role in atherosclerosis. Antioxidants may protect against lipoprotein oxidation and in that way inhibit atherosclerosis and its clinical sequelae. To investigate this possibility, we examined the association between levels of several antioxidants and myocardial infarction using serum specimens collected 7 to 14 years before the onset of myocardial infarction. Methods and Results. A nested case-control design was used. Cases and control subjects were selected from the 25 802 persons who had donated 15 mL of blood in 1974 for a serum bank. Cases comprised 123 persons with a subsequent first diagnosis of myocardial infarction who ranged from 23 through 58 years of age in 1974 and who had had their first diagnosis of myocardial infarction during 1981 to 1988. Two groups of control subjects matched to the cases for sex and age were selected from donors to the serum bank, one from those with hospital admissions during the same period and the other from the total group of donors. Sera were assayed for four carotenoids (β-carotene, lycopene, lutein, and zeaxanthin), α-tocopherol, and cholesterol. Because associations with these serum nutrients showed similar trends whether based on hospital or community controls, the two control groups were combined. There was a significantly increasing risk for subsequent myocardial infarction with decreasing levels of β-carotene in 1974 (P value for trend, .02) and a suggestive trend with decreasing levels of lutein (P=.09). When the results were stratified by smoking status, the excess risk of myocardial infarction associated with low serum levels of carotenoids was limited to smokers. A protective association with higher levels of α-tocopherol was suggested only among persons with high levels of serum cholesterol. Conclusions. Low serum levels of carotenoids were associated with an increased risk of subsequent myocardial infarction among smokers.

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