GSM6807097: Aortic Cells, anti-CD8 treatment, GEX [F9_2_GEX]; Mus musculus; OTHER
Aortas were collected from Ldlr-/- mice fed with a high fat, high cholesterol diet (Altromin, 15% milk fat, 1.25% cholesterol) for 13 weeks and treated for the last 4 weeks before sacrifice with 100 µg, i.p. twice weekly, of an anti-CD8 antibody (YTS156.7.7). 2 aortas were pooled to generate each sample, and n=5 pools were analyzed. To exclude circulating leukocytes from analysis, mice were injected with 2.5µg anti-CD45.2 APC (clone 104, BioLegend) intravenously 5 minutes before sacrifice to label blood borne immune cells. Aortas were enzymatically digested in RPMI medium containing 450U/ml collagenase I (Sigma-Aldrich C0130), 125U/ml collagenase XI (Sigma-Aldrich C7657), 60U/ml Hyaluronidase (Sigma-Aldrich H3506) for 1 hour at 37°C with agitation, washed in PBS/1% FCS and passed through a 70µm cell strainer. Cells were labeled for 20 minutes at 37°C with CalceinViolet-AM (BioLegend 425203) according to the manufacturer's instructions. Cells were washed and resuspended in PBS 1% FCS, plated in round bottom 96 well plates, and incubated for 10 minutes on ice with anti-CD16/32 (Biolegend, Clone 93, 10µg/ml) to block unspecific binding of antibodies to Fc receptor. Cells were subsequently labeled in a final volume of 100µl for 15 minutes at 4°C with anti-CD45.2 Alexa488 (2.5µg/ml, clone 104, BioLegend), anti-Ter119 PE-Cy7 (1µg/ml, clone TER119, BioLegend), 1:1000 Fixable Viability Dye, CITE-seq antibodies (see table), and hashtag antibodies. Each sample was labeled with a specific Hashtag antibody (Hashtag 6 to 10, final concentration 1:200, BioLegend). Cells were washed twice and all the sample were pooled. Viable Ter119negCD45.2-APC(i.v.)negCalceinAM+ cells were sorted using a BD FACS Aria III with a 100µm nozzle. The amount of sorted cells was adjusted so that ~50% of the total cells represent leukocytes (CD45-Alexa488+). Cells were sorted in PBS supplemented with 0.04% BSA, washed and counted in Trypan blue to assess viability (>85%). 18,000 cells were loaded at a concentration of 600 cells/µl in the 10x Genomics Chromium (Single Cell 3' v3 reagents, 10x Genomics) and scRNA-seq ADT and HTO libraries were prepared. Single cells were encapsulated into droplets with the Chromium™ Controller (10x Genomics). Transcripts captured in all cells encapsulated with a bead were uniquely barcoded using a combination of a 16 bp 10x Barcode and a 12 bp unique molecular identifier (UMI). cDNA libraries were generated using the Chromium™ Single Cell 3' Library & Gel Bead Kit v3 (10x Genomics) following the detailed protocol provided by the manufacturer. -CITE-seq library: amplification was performed at 95°C for 3' followed by ten cycles at 95°C f¬¬or 20''; 60°C for 30''; 72°C for 20'' and final elongation 72°C for 5' with 5'-CAAGCAGAAGACGGCATACGAGATCGTGATGTGACTGGAGTTCCTTGGCACCCGAGAATTCCA-3' Small RNA RPI1 primer as i7 primer (Illumina). -HASH-seq library: amplification was performed at 95°C for 3' followed by ten cycles 95°C for 20''; 64°C for 30''; 72°C for 20'' and final elongation 72°C for 5' with 5'-CAAGCAGAAGACGGCATACGAGATCGAGTAATGTGACTGGAGTTCAGACGTGTGC-3' TruSeq D701_s primer as i7 primer (Illumina). The following 5'- AATGATACGGCGACCACCGAGATCTACACTCTTTCCCTACACGACGCTC-3' SI-PCR primer as i5 primer (Illumina) was used for both CITE- and HASH- seq library amplification. Following the final bead purification, all three libraries were pooled as 80% mRNA library, 10% ADT library and 10% HTO library before sequencing.