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Biochemical and Molecular Actions of Nutrients

Phytosterol Oxidation Products Are Absorbed in the Intestinal Lymphatics in Rats but Do Not Accelerate Atherosclerosis in Apolipoprotein E–Deficient Mice¹

Laboratory of Nutrition Chemistry, Division of Bioresource and Bioenvironmental Sciences, Graduate School, Kyushu University, Fukuoka 812-8681, Japan

²To whom correspondence should be addressed. E-mail: imaizumi{at}agr.kyushu-u.ac.jp.

Phytosterol oxidation products (oxyphytosterols) are formed during the processing and storage of foods. However, it is unknown whether oxyphytosterols affect human health. To address these issues, we prepared ß-sitosterol and campesterol oxides, evaluated their lymphatic absorption in rats, and examined the effect of an oxyphytosterol diet on atherosclerosis in apolipoprotein (apo) E–deficient mice. The lymphatic absorption of cholesterol and 6 oxyphytosterols (7-hydroxy, 7ß-hydroxy, ß-epoxy, -epoxy, dihydroxy, and 7-keto) of ß-sitosterol or campesterol was assessed in thoracic duct–cannulated rats fed an AIN-93G–based diet containing 2.5 g of cholesterol, oxyphytosterols, or intact phytosterols per kg. Lymphatic recoveries (on a mass basis) of oxycampesterols (15.9 ± 2.8%, n = 10) and oxysitosterols (9.12 ± 1.77%, n = 10) were higher than for campesterol (5.47 ± 1.02%, n = 12, P < 0.05) and ß-sitosterol (2.16 ± 0.37%, n = 12, P < 0.05), but lower than for cholesterol (37.3 ± 8.3%, n = 6, P < 0.05). Apo E–deficient mice were fed an AIN-93G–based diet containing 0.2 g oxyphytosterols or intact phytosterols per kg for 9 wk. Diet-derived oxyphytosterols accumulated in the serum, liver, and aorta. Furthermore, the oxyphytosterol diet increased oxycholesterol in the serum compared to the phytosterol diet. However, there was no significant difference between the 2 groups in the serum and aortic cholesterol concentration, the lesion area in the aortic root, or 8-iso-prostaglandin F2 concentration in the urine. These results indicate that exogenous oxyphytosterols are well-absorbed and accumulate in the body, but do not promote the development of atherosclerosis in apo E–deficient mice.

KEY WORDS: • phytosterol • oxyphytosterol • absorption • atherosclerosis

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