Increase of serum cholesterol levels by heat-moisture-treated high-amylose cornstarch in rats fed a high-cholesterol diet.
The effects of four cornstarches containing various contents of resistant starch on serum and liver cholesterol levels in rats fed a high-cholesterol diet were investigated. Male Sprague Dawley rats (aged 4 weeks) were divided into four groups (n = 7) and fed high-cholesterol diets containing 15% of cornstarch (CS), heat-moisture-treated CS (HCS), high-amylose CS (HA), or heat-moisture-treated HA (HHA) for 21 days. The results showed that the serum and hepatic level of total cholesterol, LDL-cholesterol, and triglyceride in rats of the HHA group and their arteriosclerosis index were significantly higher, suggesting that HHA increases the risk of arteriosclerosis under a high-cholesterol dietary condition. No significant between-group differences were noted in the levels of plasma mevalonic acid and hepatic HMG-CoA reductase mRNA, whereas fecal cholesterol excretion was significantly higher in the HHA group, indicating that the elevation of the serum and liver cholesterol levels was not due to the promotion of liver cholesterol synthesis and cholesterol absorption in the intestine.
Udagawa
Haruhide
H
Department of Nutritional Science, Faculty of Applied Bioscience, Tokyo University of Agriculture, 1-1-1 Sakuragaoka, Tokyo, 156-8502, Japan. haruhideudagawa@ybb.ne.jp
Kitaoka
Chika
C
Sakamoto
Tatsuaki
T
Kobayashi-Hattori
Kazuo
K
Oishi
Yuichi
Y
Arai
Soichi
S
Takita
Toshichika
T
D000688:Amylose / Q000494:pharmacology*; D000818:Animals; D001835:Body Weight / Q000187:drug effects; D002432:Cecum / Q000187:drug effects / Q000378:metabolism; D002784:Cholesterol / Q000097:blood*; D002791:Cholesterol, Dietary / Q000494:pharmacology*; D003890:Desiccation; D005243:Feces / Q000737:chemistry; D005786:Gene Expression Regulation / Q000187:drug effects; D006358:Hot Temperature; D006813:Humidity; D006903:Hydroxymethylglutaryl CoA Reductases / Q000235:genetics / Q000378:metabolism; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D008297:Male; D008798:Mevalonic Acid / Q000097:blood; D009929:Organ Size / Q000187:drug effects; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D017207:Rats, Sprague-Dawley; D003313:Zea mays
D002791:Cholesterol, Dietary; D012333:RNA, Messenger; D000688:Amylose; D002784:Cholesterol; D006903:Hydroxymethylglutaryl CoA Reductases; D008798:Mevalonic Acid