Abstract
Reverse cholesterol transport (RCT) and transintestinal cholesterol efflux (TICE) are two important pathways for body cholesterol elimination. We studied these pathways in an animal model of diabetes and obesity (ob/ob) where HDL function is compromised as a result of hyperglycemia, low-grade inflammation and oxidative stress. Co-treatment of ob/ob mice with PPAR-α (fenofibrate) and LXR (T0901317) agonists increased fecal cholesterol by 12-fold; PPAR-α and LXR agonists individually showed 2.6- and 4.0-fold fecal cholesterol excretion, respectively. We investigated the mechanism of synergistic efficacy of PPAR-α and LXR agonists in fecal cholesterol excretion. LXR agonist and the combination of PPAR-α and LXR agonists had greater HDL-C elevation. Ex vivo cholesterol efflux showed correlation with the fecal cholesterol excretion but was not sufficient to explain 12-fold increases in the fecal cholesterol in the co-treated mice. Therefore, we examined TICE to explain the 12-fold increases in the fecal cholesterol. A strong positive correlation of fecal cholesterol with ATP binding cassette transporter G5 (ABCG5) and G8 and a negative correlation with NPC1L1 was observed. ABCG5, G8 and NPC1L1 are involved in intestinal cholesterol absorption. The extent of influence of PPAR-α and LXR agonists on RCT and TICE was distinctly different. PPAR-α agonist increased fecal cholesterol primarily by influencing TICE, while LXR agonist influenced fecal cholesterol excretion via both RCT and TICE mechanisms. Synergistic efficacy on fecal cholesterol excretion following co-treatment with PPAR-α and LXR agonists occurred through a combination of RCT, TICE, and the key enzyme in bile synthesis, cholesterol 7-α hydroxylase (cyp7a1). These results suggest that cholesterol efflux, biliary cholesterol excretion, and TICE collectively contributed to the 12-fold increases in the fecal cholesterol excretion in ob/ob mice co-treated with PPAR-α and LXR agonists.
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Abbreviations
- CVD:
-
Cardiovascular disease
- CAD:
-
Coronary artery disease
- HDL-C:
-
High density lipoprotein cholesterol
- LDL-C:
-
Low-density lipoprotein cholesterol
- RCT:
-
Reverse cholesterol transport
- ABCA1:
-
ATP binding cassette transporter A1
- ABCG5:
-
ATP binding cassette transporter G5
- ABCG8:
-
ATP binding cassette transporter G8
- LXR:
-
Liver x receptor
- PPAR:
-
Peroxisome proliferator activated receptor
- RXR:
-
Retinoid x receptor
- FAS:
-
Fatty acid synthase
- SCD1:
-
Stearoyl coA desaturase 1
- SREBP1c:
-
Sterol response element binding protein 1c
- Cyp7A1:
-
Cholesterol 7-alpha hydroxylase
- NPC1L1:
-
Niemann-Pick C1-Like 1
- Acox:
-
Acetyl-CoA oxidase
- SR-BI:
-
Scavenger receptor class B type 1
- ACAT:
-
Acyl-CoA cholesterol acyltransferase
- T1317:
-
T0901317
- TICE:
-
Transintestinal cholesterol efflux
- ELSD:
-
Evaporative light scattering detector
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Rai Ajit K Srivastava designed the study, evaluated data from the studies and contributed to the interpretation and analyses of data as well as writing of the manuscript. Angelo Cefalu performed some studies and wrote part of the manuscript, and Nishtha Srivastava contributed to the animal studies. Maurizio Averna contributed to the review and interpretation of the data and wrote part of the manuscript.
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Rai Ajit K Srivastava works as an independent consultant to Biotech companies. All authors declare no competing interests.
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Srivastava, R.A.K., Cefalu, A.B., Srivastava, N.S. et al. NPC1L1 and ABCG5/8 induction explain synergistic fecal cholesterol excretion in ob/ob mice co-treated with PPAR-α and LXR agonists. Mol Cell Biochem 473, 247–262 (2020). https://doi.org/10.1007/s11010-020-03826-3
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DOI: https://doi.org/10.1007/s11010-020-03826-3