Retinol and retinoic acid binding to human retinol binding protein 4 hRBP4. KAR, Acquisition of data, Analysis and interpretation of data. Critical role for all-trans retinoic acid for optimal effector and effector memory CD8 T cell differentiation. Received Apr 30; Accepted Jul Single-wavelength anomalous dispersion SAD data were collected at the selenium K edge 0. Numerous biochemical, physiologic, and epidemiologic studies have shown that vitamin A and its derivative retinol are essential for the development of robust immunity Stephensen, Thank you for sending your work entitled “Serum amyloid A is a retinol binding protein that transports retinol during bacterial infection” for consideration at eLife.
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Adaptation of innate lymphoid cells to a micronutrient deficiency promotes type 2 barrier immunity. Figure 3—figure supplement 1. Liquid-chromatographic assay for retinol vitamin A and retinol analogs in therapeutic trials.
Induction of intestinal Th17 cells by segmented filamentous bacteria.
IGC. ENL. Pure.
Expression of SAAs is strongly induced by microbial exposure. Derebe, Zlatkov et al. Reciprocal TH17 and regulatory T mosue differentiation mediated by retinoic acid.
Saa transcript abundance was determined by Q-PCR. Although a role for SAAs in cholesterol transport and metabolism has been proposed van der Westhuyzen et al.
First, all SAAs are predicted to form amphipathic helices with a hydrophobic face that could interact with non-polar molecules Stevens, There is also a neat demonstration of a non-polar binding pocket in crystallographic analysis of SAA3, which is shown directly to form a tetramer through crosslinking studies. Journal of Nutrition Briefly, a twofold difference was considered significant if three criteria were met: B Cross-linking analysis of mSAA3.
Biochemical and Biophysical Research Communications Standard curves were generated by spiking retinol or retinoic acid into 1 ml of 20 mM Tris pH 8. Plots are representative of five independent experiments. First, SAAs are strongly induced by microbial exposure at sites of retinol uptake intestine and storage liverand are present at high levels in the circulation following microbial challenge Chiba et al.
Representative plots and K d s were calculated from the binding assay data and were derived from five independent experiments. European Journal of Biochemistry There are multiple probe sets representing Saa1 on the Affymetrix arrays and both of these probe sets showed a change in transcript abundance. Fluorescence emission was monitored at nm with excitation at nm as in C. We performed a similar analysis to identify genes that are differentially regulated between mice fed a normal diet vs those fed a vitamin A-deficient diet.
Mass spectrometry analysis of retinol and retinoic acid Retinoid extraction was modified and scaled from a previously described procedure McClean et al. The genes that show consistent expression differences include saa 1 and 2 please note that I assume that saa 3 should be substituted for one of the saa1 labels, which appear twice in Figure 1—figure supplement 1.
PowerMouse • LXNAV Gliding
Recombinant mSAA1 and 3 were expressed and purified as described below. What is the impact of SAA deficiency on the intestinal response to S. Crystal structure data collection and refinement statistics DOI: Structural mechanism of serum amyloid A-mediated inflammatory amyloidosis. Several of the other transcripts identified in the microarray analysis in Figure 1—figure supplement 1 are indeed interesting and represent targets for future analysis of ls-w103 vitamin A impacts mucosal function.
A key question is whether there are tissue-specific effects of intestinal epithelial SAAs, or whether the intestinal SAAs enter the circulation with bound retinol acquired directly from the diet.