TY - JOUR
T1 - Adaptation of cholesterol synthesis to fasting and TNF-α
T2 - Profiling cholesterol intermediates in the liver, brain, and testis
AU - Fon Tacer, Klementina
AU - Pompon, Denis
AU - Rozman, Damjana
N1 - Funding Information:
We thank Mogens Baltsen and Dr. A.G. Byskov (Laboratory of Reproductive Biology, University Hospital of Copenhagen) for FF-MAS and T-MAS standards, Helena Klavžar (CFGBC, University of Ljubljana, Slovenia), Martina Perše (Institute of Pathology, Medical Experimental Centre, Faculty of Medicine University of Ljubljana), Dr. Manica Černe (Lek, d.d.) and Dr. Srdjan Novakovič (Institute of Oncology Ljubljana) for help with animals. Dr. K. Košmelj, J. Ačimović and Dr. P. Juvan are also acknowledged for helpful discussions on statistical analysis. The work was supported by the Slovenian Research Agency , Grants J1-6713 , P1-0527 , Z1-7562-0381 , and the funds of Lek Pharmaceuticals, d.d. Klementina Fon Tacer was supported by the fellowship from the Slovenian Research Agency.
Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.
PY - 2010/8
Y1 - 2010/8
N2 - Key players in pathogenesis of metabolic disorders are disturbed cholesterol balance and inflammation. In addition to cholesterol also sterol intermediates are biologically active, however, surprisingly little is known about their synthesis and roles. The aim of our study was to assess the interplay between the inflammatory cytokine TNF-α and cholesterol synthesis by measuring cholesterol and its intermediates in the liver, brain, and testis. Liquid chromatography-mass spectrometry has been applied to profile sterols of normally fed mice, during fasting and after TNF-α administration. In mice on normal chow diet, sterols other than cholesterol represent 0.5% in the liver, 1% in brain and 5% in testis. In the liver only 7-dehydrocholesterol, lanosterol and desmosterol were detected. Major sterol intermediates of the brain are desmosterol, testis meiosis activating sterol (T-MAS), and 7-dehydrocholesterol while in testis T-MAS predominates (4%), followed by desmosterol, lanosterol, 7-dehydrocholesterol and others. In 20. h fasting there is no significant change in cholesterol of the three tissues, and no significant change in intermediates of the liver. In the brain sterol intermediates are lowered (significant for zymosterol) while in the testis the trend is opposite. TNF-α provokes a significant raise of some intermediates whereas the level of cholesterol is again unchanged. The proportion of sterols in the liver rises from 0.5% in controls to 1.2% in TNF-α-treated mice, which is in accordance with published expression profiling data. In conclusion, our data provide novel insights into the interaction between the inflammatory cytokine TNF-α and the tissue-specific cholesterol biosynthesis of the liver, brain and testis.
AB - Key players in pathogenesis of metabolic disorders are disturbed cholesterol balance and inflammation. In addition to cholesterol also sterol intermediates are biologically active, however, surprisingly little is known about their synthesis and roles. The aim of our study was to assess the interplay between the inflammatory cytokine TNF-α and cholesterol synthesis by measuring cholesterol and its intermediates in the liver, brain, and testis. Liquid chromatography-mass spectrometry has been applied to profile sterols of normally fed mice, during fasting and after TNF-α administration. In mice on normal chow diet, sterols other than cholesterol represent 0.5% in the liver, 1% in brain and 5% in testis. In the liver only 7-dehydrocholesterol, lanosterol and desmosterol were detected. Major sterol intermediates of the brain are desmosterol, testis meiosis activating sterol (T-MAS), and 7-dehydrocholesterol while in testis T-MAS predominates (4%), followed by desmosterol, lanosterol, 7-dehydrocholesterol and others. In 20. h fasting there is no significant change in cholesterol of the three tissues, and no significant change in intermediates of the liver. In the brain sterol intermediates are lowered (significant for zymosterol) while in the testis the trend is opposite. TNF-α provokes a significant raise of some intermediates whereas the level of cholesterol is again unchanged. The proportion of sterols in the liver rises from 0.5% in controls to 1.2% in TNF-α-treated mice, which is in accordance with published expression profiling data. In conclusion, our data provide novel insights into the interaction between the inflammatory cytokine TNF-α and the tissue-specific cholesterol biosynthesis of the liver, brain and testis.
KW - Cholesterol biosynthesis
KW - Fasting
KW - Inflammation
KW - Sterol intermediates
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U2 - 10.1016/j.jsbmb.2010.02.026
DO - 10.1016/j.jsbmb.2010.02.026
M3 - Article
C2 - 20206258
AN - SCOPUS:77955418150
SN - 0960-0760
VL - 121
SP - 619
EP - 625
JO - Journal of Steroid Biochemistry and Molecular Biology
JF - Journal of Steroid Biochemistry and Molecular Biology
IS - 3-5
ER -