脂肪组织
多不饱和脂肪酸
脂质代谢
生物化学
脂滴
基因
生物
脂肪酸
酶
新陈代谢
基因表达
脂肪生成
化学
作者
David A. Bernlohr,Natalie Ribarik Coe,Melanie A. Simpson,Ann V. Hertzel
标识
DOI:10.1007/978-1-4757-2670-1_12
摘要
SummaryIn fat cells polyunsaturated fatty acids are both substrates for, and products of, triacylglycerol metabolism. Dietary fatty acids are efficiently incorporated into the triacylglycerol droplet under lipogenic conditions while rapidly mobilizing them during lipolytic stimulation. Hence, the flux and magnitude of the fatty acid pool in adipocytes is constantly changing in response to hormonal, metabolic and genetic determinants. Due to the rapidly changing flux of fatty acids, the majority of genes encoding enzymes and proteins of lipid metabolism are largely refractory to long-term regulatory control by fatty acids. Only at extremes of high or low lipid levels, or under pathophysiological conditions, do adipose genes respond by up- or down-regulating gene expression. Despite the lack of responsiveness to lipids in adipose tissue, a surprisingly large number of genes have been characterized recently as lipid responsive when assayed in heterologous systems. These observations suggest an endogenous negative element exists in the lipid signaling pathway in adipocytes.
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