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Research Article Free access | 10.1172/JCI116437

Effects of low dose oral contraceptives on very low density and low density lipoprotein metabolism.

B W Walsh and F M Sacks

Channing Laboratory, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts 02115.

Find articles by Walsh, B. in: JCI | PubMed | Google Scholar

Channing Laboratory, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts 02115.

Find articles by Sacks, F. in: JCI | PubMed | Google Scholar

Published May 1, 1993 - More info

Published in Volume 91, Issue 5 on May 1, 1993
J Clin Invest. 1993;91(5):2126–2132. https://doi.org/10.1172/JCI116437.
© 1993 The American Society for Clinical Investigation
Published May 1, 1993 - Version history
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Abstract

Oral contraceptives (OC) raise plasma triglyceride and VLDL levels, which may be of concern, since some conditions characterized by elevated triglycerides are associated with atherosclerosis. To identify the responsible mechanism, we studied 11 healthy premenopausal women, 5 of whom were taking OC containing 0.035 mg ethinyl estradiol, and 6 of whom were not. Their rates of VLDL and LDL metabolism were measured by endogenously labeling apoB, the protein component of VLDL and LDL, by an intravenous infusion of deuterated leucine. OC use had the greatest effect on the large, triglyceride-rich VLDL subfraction (Sf 60-400), increasing plasma levels threefold and production rates fivefold (P < 0.05). Among OC users, small VLDL (Sf 20-60) levels were 2.2 times higher, and production rates were 3.4-fold higher (P < 0.05). The fractional catabolic rates of large and small VLDL were similar among OC users and nonusers. LDL levels and metabolic rates were not significantly different between the two groups. Thus, contemporary low dose OC substantially raise VLDL levels by increasing the production rate of large, triglyceride-rich VLDL, and not by slowing VLDL catabolism. Since VLDL catabolism is not impaired, we speculate that the hypertriglyceridemia induced by OC may be less atherogenic than that of hypertriglyceridemia resulting from impaired lipolysis. This may explain why long-term OC use does not appear to promote atherosclerosis.

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