Abstract
The scavenger receptor class B, type I (SR-BI) is an important player in regulation of mammalian lipid homeostasis. We therefore wanted to study this receptor in Atlantic salmon (Salmo salar L.), which requires a diet with particular high lipid content. We have for the first time cloned and characterized SR-BI from a salmonid fish. The predicted 494 amino acid protein contained two transmembrane domains, several putative N-glycosylation sites, and showed 72% sequence identity with the predicted homolog from zebrafish. SR-BI expression was analyzed by reverse transcription Real-Time PCR in several tissues, and a high relative expression in salmon midgut was detected, which may suggest that SR-BI has a role in uptake of lipids from the diet. We also expressed a construct of salmon myc-tagged SR-BI in salmon TO cells and HeLa cells, which gave a protein of approximately 80 kDa on reducing SDS-PAGE using an antibody against the myc-epitope. Immunofluorescence microscopy analyses of the salmon SR-BI protein in transiently transfected HeLa cells revealed staining in the cell periphery and in some intracellular membranes, but not in the nucleus, which indicated that the salmon protein may be a functional membrane protein. We also observed a high degree of co-localization using an anti-peptide SR-BI antiserum. We found that 20 μg mL−1 insulin up-regulated the SR-BI mRNA levels in primary cultures of salmon hepatocytes relative to untreated cells. Oleic acid, EPA, DHA, or dexamethasone did not affect the relative expression of SR-BI in this liver model system. In conclusion, the salmon SR-BI cDNA encoded a protein with several features common to those of mammalian species. SR-BI gene expression was high in the intestine, which leads us to propose that SR-BI may contribute to the uptake of lipids from the diet.
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Abbreviations
- aa:
-
amino acid
- AB:
-
antibody
- BSA:
-
bovine serum albumin
- CLA-1:
-
CD36 and LIMPII analogous-1
- D:
-
dermis
- Dex:
-
dexamethasone
- DHA:
-
docosahexaenoic acid
- EF1A:
-
elongation factor 1 alpha
- EPA:
-
eicosapentaenoic acid
- FA:
-
fatty acid
- FBS:
-
fetal bovine serum
- G:
-
gills
- H:
-
heart
- HDL:
-
high-density lipoprotein
- HG:
-
hindgut
- HK:
-
head kidney
- Ins:
-
insulin
- L:
-
liver
- LDL:
-
low-density lipoprotein
- MG:
-
midgut
- nt:
-
nucleotides
- OA:
-
oleic acid
- ORF:
-
open reading frame
- PBS:
-
phosphate buffered saline
- PPAR:
-
peroxisome proliferator-activated receptor
- PUFA:
-
polyunsaturated FA
- RACE:
-
rapid amplification of cDNA ends
- REST:
-
relative expression software tool
- S:
-
spleen
- SR-BI/II/III:
-
scavenger receptor class B, type I/II/III
- SDS-PAGE:
-
sodium dodecyl sulfate polyacrylamide gel electrophoresis
- TAG:
-
triacylglycerol
- UTR:
-
untranslated region
- VLDL:
-
very low-density lipoprotein
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Kleveland, E.J., Syvertsen, B.L., Ruyter, B. et al. Characterization of scavenger receptor class B, type I in Atlantic salmon (Salmo salar L.). Lipids 41, 1017–1027 (2006). https://doi.org/10.1007/s11745-006-5052-3
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DOI: https://doi.org/10.1007/s11745-006-5052-3