Division of Pediatric Surgery, St Louis Children's Hospital, One Children's Place, Suite 5S40, St. Louis, MO, 63110, USA.
J Gastrointest Surg. 2014 Feb;18(2):286-94; discussion 294. doi: 10.1007/s11605-013-2338-7. Epub 2013 Sep 4.
Previous studies have shown that high-fat diet (HFD) enhances adaptation if provided immediately following small bowel resection (SBR). The purpose of this study was to determine if HFD could further enhance villus growth after resection-induced adaptation had already taken place. C57/Bl6 mice underwent a 50 % proximal SBR or sham operation and were then provided a standard rodent liquid diet (LD) ad lib. After a typical period of adaptation (7 days), SBR and sham-operated mice were randomized to receive either LD or HFD (42 % kcal fat) for an additional 7 days. Mice were then harvested, and small intestine was collected for analysis. Adaptation occurred in both SBR groups; however, the SBR/HFD had significantly increased villus height compared to SBR/LD. Reverse transcription-polymerase chain reaction of villus enterocytes showed a marked increase in CD36 expression in the SBR/HFD group compared with SBR/LD mice. While exposure to increased enteral fat alone did not affect villus morphology in sham-operated mice, HFD significantly increased villus growth in the setting of resection-induced adaptation, supporting the clinical utility of enteral fat in augmenting adaptation. Increased expression of CD36 suggests a possible mechanistic role in dietary fat metabolism and villus growth in the setting of short gut syndrome.
先前的研究表明,高脂肪饮食(HFD)在小肠切除(SBR)后立即提供时可以增强适应性。本研究的目的是确定 HFD 是否可以在切除诱导的适应性已经发生后进一步促进绒毛生长。C57/Bl6 小鼠接受 50%的近端 SBR 或假手术,并随后提供标准啮齿动物液体饮食(LD)随意食用。在典型的适应期(7 天)后,SBR 和假手术组的小鼠被随机分为接受 LD 或 HFD(42%的卡路里脂肪)再 7 天。然后收获小鼠,收集小肠进行分析。两组 SBR 均发生适应性改变;然而,与 SBR/LD 相比,SBR/HFD 组的绒毛高度明显增加。绒毛肠细胞的逆转录-聚合酶链反应显示,与 SBR/LD 组相比,SBR/HFD 组 CD36 的表达明显增加。虽然单独暴露于增加的肠内脂肪不会影响假手术组的绒毛形态,但 HFD 显著增加了切除诱导适应性中的绒毛生长,支持肠内脂肪在增强适应性方面的临床应用。CD36 的表达增加表明在短肠综合征中,它在膳食脂肪代谢和绒毛生长中可能具有潜在的机制作用。