TY - JOUR
T1 - Evaluation of dietary effects on hepatic lipids in high fat and placebo diet fed rats by in vivo MRS and LC-MS techniques
AU - Yaligar, Jadegoud
AU - Gopalan, Venkatesh
AU - Kiat, Ong Wee
AU - Sugii, Shigeki
AU - Shui, Guanghou
AU - Lam, Buu Duyen
AU - Henry, Christiani Jeyakumar
AU - Wenk, Markus R.
AU - Tai, E. Shyong
AU - Velan, S. Sendhil
PY - 2014/3/17
Y1 - 2014/3/17
N2 - Background & Aims: Dietary saturated fatty acids contribute to the development of fatty liver and have pathogenic link to systemic inflammation. We investigated the effects of dietary fat towards the pathogenesis of non-alcoholic fatty liver disease by longitudinal in vivo magnetic resonance spectroscopy (MRS) and in vitro liquid chromatography coupled with mass spectrometry (LC-MS). Methods: All measurements were performed on rats fed with high fat diet (HFD) and chow diet for twenty four weeks. Longitudinal MRS measurements were performed at the 12th, 18th and 24th weeks. Liver tissues were analyzed by LC-MS, histology and gene transcription studies after terminal in vivo experiments. Results: Liver fat content of HFD rats for all ages was significantly (P<0.05) higher compared to their respective chow diet fed rats. Unsaturation indices estimated from MRS and LC-MS data of chow diet fed rats were significantly higher (P<0.05) than HFD fed rats. The concentration of triglycerides 48:1, 48:2, 50:1, 50:2, 50:3, 52:1, 52:2, 52:3, 54:3 and 54:2 was significantly higher (P<0.05) in HFD rats. The concentration for some polyunsaturated triglycerides 54:7, 56:8, 56:7, 58:11, 58:10, 58:9, 58:8 and 60:10 was significantly higher (P<0.05) in chow diet fed rats compared to HFD rats. Lysophospholipid concentrations including LPC and LPE were higher in HFD rats at 24 weeks indicating the increased risk of diabetes. The expression of CD36, PPARa, SCD1, SREBF1 and UCP2 were significantly upregulated in HFD rats. Conclusions: We demonstrated the early changes in saturated and unsaturated lipid composition in fatty liver by in vivo MRS and ex vivo LC-MS. The higher LPC concentration in HFD rats indicated a higher risk of developing diabetes. Early metabolic perturbations causing changes in lipid composition can be evaluated by the unsaturation index and correlated to the non alcoholic fatty liver disease. Copyright:
AB - Background & Aims: Dietary saturated fatty acids contribute to the development of fatty liver and have pathogenic link to systemic inflammation. We investigated the effects of dietary fat towards the pathogenesis of non-alcoholic fatty liver disease by longitudinal in vivo magnetic resonance spectroscopy (MRS) and in vitro liquid chromatography coupled with mass spectrometry (LC-MS). Methods: All measurements were performed on rats fed with high fat diet (HFD) and chow diet for twenty four weeks. Longitudinal MRS measurements were performed at the 12th, 18th and 24th weeks. Liver tissues were analyzed by LC-MS, histology and gene transcription studies after terminal in vivo experiments. Results: Liver fat content of HFD rats for all ages was significantly (P<0.05) higher compared to their respective chow diet fed rats. Unsaturation indices estimated from MRS and LC-MS data of chow diet fed rats were significantly higher (P<0.05) than HFD fed rats. The concentration of triglycerides 48:1, 48:2, 50:1, 50:2, 50:3, 52:1, 52:2, 52:3, 54:3 and 54:2 was significantly higher (P<0.05) in HFD rats. The concentration for some polyunsaturated triglycerides 54:7, 56:8, 56:7, 58:11, 58:10, 58:9, 58:8 and 60:10 was significantly higher (P<0.05) in chow diet fed rats compared to HFD rats. Lysophospholipid concentrations including LPC and LPE were higher in HFD rats at 24 weeks indicating the increased risk of diabetes. The expression of CD36, PPARa, SCD1, SREBF1 and UCP2 were significantly upregulated in HFD rats. Conclusions: We demonstrated the early changes in saturated and unsaturated lipid composition in fatty liver by in vivo MRS and ex vivo LC-MS. The higher LPC concentration in HFD rats indicated a higher risk of developing diabetes. Early metabolic perturbations causing changes in lipid composition can be evaluated by the unsaturation index and correlated to the non alcoholic fatty liver disease. Copyright:
UR - http://www.scopus.com/inward/record.url?scp=84898639621&partnerID=8YFLogxK
U2 - 10.1371/journal.pone.0091436
DO - 10.1371/journal.pone.0091436
M3 - Article
C2 - 24638096
AN - SCOPUS:84898639621
SN - 1932-6203
VL - 9
JO - PLoS ONE
JF - PLoS ONE
IS - 3
M1 - e91436
ER -