Scavenger Receptor Class B Type I Regulates Plasma Apolipoprotein E Levels and Dietary Lipid Deposition to the Liver

Biochemistry ◽  
2015 ◽  
Vol 54 (36) ◽  
pp. 5605-5616 ◽  
Author(s):  
Eleni A. Karavia ◽  
Nikolaos I. Papachristou ◽  
George C. Sakellaropoulos ◽  
Eva Xepapadaki ◽  
Eleni Papamichail ◽  
...  
Keyword(s):  
Apolipoprotein E ◽  
Scavenger Receptor ◽  
Dietary Lipid ◽  
Type I ◽  
Lipid Deposition ◽  
Scavenger Receptor Class ◽  
Class B ◽  
Plasma Apolipoprotein

scholarly journals Scavenger Receptor Class B, Type I, a CD36 Related Protein in Macrobrachium nipponense: Characterization, RNA Interference, and Expression Analysis with Different Dietary Lipid Sources

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Zhili Ding ◽  
Na Luo ◽  
Youqin Kong ◽  
Jingfen Li ◽  
Yixiang Zhang ◽  
...  
Keyword(s):  
Lipid Metabolism ◽  
Scavenger Receptor ◽  
Dietary Lipid ◽  
Type I ◽  
Macrobrachium Nipponense ◽  
Scavenger Receptor Class ◽  
Fish Lipid ◽  
Class B ◽  
Homeostasis Regulation ◽  
Transmembrane Regions

The scavenger receptor class B, type I (SR-BI), is a member of the CD36 superfamily comprising transmembrane proteins involved in mammalian and fish lipid homeostasis regulation. We hypothesize that this receptor plays an important role in Macrobrachium nipponense lipid metabolism. However, little attention has been paid to SR-BI in commercial crustaceans. In the present study, we report a cDNA encoding M. nipponense scavenger receptor class B, type I (designated as MnSR-BI), obtained from a hepatopancreas cDNA library. The complete MnSR-BI coding sequence was 1545 bp, encoding 514 amino acid peptides. The MnSR-BI primary structure consisted of a CD36 domain that contained two transmembrane regions at the N- and C-terminals of the protein. SR-BI mRNA expression was specifically detected in muscle, gill, ovum, intestine, hepatopancreas, stomach, and ovary tissues. Furthermore, its expression in the hepatopancreas was regulated by dietary lipid sources, with prawns fed soybean and linseed oils exhibiting higher expression levels. RNAi-based SR-BI silencing resulted in the suppression of its expression in the hepatopancreas and variation in the expression of lipid metabolism-related genes. This is the first report of SR-BI in freshwater prawns and provides the basis for further studies on SR-BI in crustaceans.

scholarly journals HDL modification by secretory phospholipase A2 promotes scavenger receptor class B type I interaction and accelerates HDL catabolism

2000 ◽  
Vol 41 (11) ◽  
pp. 1849-1857 ◽  
Author(s):  
Frederick C. de Beer ◽  
Patrice M. Connell ◽  
J. Yu ◽  
Maria C. de Beer ◽  
Nancy R. Webb ◽  
...  
Keyword(s):  
Phospholipase A2 ◽  
Scavenger Receptor ◽  
Type I ◽  
Secretory Phospholipase A2 ◽  
Secretory Phospholipase ◽  
Scavenger Receptor Class ◽  
Class B

MS81 LIVER-SPECIFIC LIPOPLEXES FOR THE KNOCKDOWN OF SCAVENGER RECEPTOR CLASS B TYPE I

2010 ◽  
Vol 11 (2) ◽  
pp. 126
Author(s):  
K. Duwensee ◽  
I. Tancevski ◽  
E. Demetz ◽  
P. Eller ◽  
C. Heim ◽  
...  
Keyword(s):  
Scavenger Receptor ◽  
Type I ◽  
Scavenger Receptor Class ◽  
Class B

scholarly journals Feedback Inhibition of Human Scavenger Receptor Class B Type I Gene Expression by Glucocorticoid in Adrenal and Ovarian Cells

Endocrinology ◽  
2010 ◽  
Vol 151 (7) ◽  
pp. 3214-3224 ◽  
Author(s):  
Sofia Mavridou ◽  
Maria Venihaki ◽  
Olga Rassouli ◽  
Christos Tsatsanis ◽  
Dimitris Kardassis
Keyword(s):  
Gene Expression ◽  
Gene Transcription ◽  
Feedback Inhibition ◽  
Steroid Hormone ◽  
Scavenger Receptor ◽  
Type I ◽  
Mrna Levels ◽  
Ovarian Cells ◽  
Scavenger Receptor Class ◽  
Class B

Scavenger receptor class B type I (SR-BI) facilitates the reverse transport of excess cholesterol from peripheral tissues to the liver via high-density lipoproteins. In steroidogenic tissues, SR-BI supplies cholesterol for steroid hormone production. We show here that the transcription of the human SR-BI gene is subject to feedback inhibition by glucocorticoid in adrenal and ovarian cells. SR-BI mRNA levels were increased in adrenals from corticosterone-insufficient Crh−/− mice, whereas corticosterone replacement by oral administration inhibited SR-BI gene expression in these mice. SR-BI mRNA levels were increased in adrenals from wild-type mice treated with metyrapone, a drug that blocks corticosterone synthesis. Experiments in adrenocortical H295R and ovarian SKOV-3 cells using cycloheximide and siRNA-mediated gene silencing revealed that glucocorticoid-mediated inhibition of SR-BI gene transcription requires de novo protein synthesis and the glucocorticoid receptor (GR). No direct binding of GR to the SR-BI promoter could be demonstrated in vitro and in vivo, suggesting an indirect mechanism of repression of SR-BI gene transcription by GR in adrenal cells. Deletion analysis established that the region of the human SR-BI promoter between nucleotides −201 and −62 is sufficient to mediate repression by glucocorticoid. This region contains putative binding sites for transcriptional repressors that could play a role in SR-BI gene regulation in response to glucocorticoid. In summary, this is the first report showing that glucocorticoid suppress SR-BI expression suggesting that steroidogenic tissues maintain steroid hormone homeostasis by prohibiting SR-BI-mediated high-density lipoprotein cholesterol uptake when the endogenous levels of glucocorticoid are elevated.

scholarly journals Inhibition of hepatic scavenger receptor-class B type I by RNA interference decreases atherosclerosis in rabbits

2012 ◽  
Vol 222 (2) ◽  
pp. 360-366 ◽  
Author(s):  
Egon Demetz ◽  
Ivan Tancevski ◽  
Kristina Duwensee ◽  
Ursula Stanzl ◽  
Eva Huber ◽  
...  
Keyword(s):  
Rna Interference ◽  
Scavenger Receptor ◽  
Type I ◽  
Scavenger Receptor Class ◽  
Class B
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