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3 protocols using vacutainer lithium heparinn lh 170 1 u plus blood collection tubes

1

PBMC Isolation from Whole Blood

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Approximately 13 mL of blood was collected per volunteer, per time point, in BD Vacutainer® Lithium HeparinN (LH) 170 I.U. Plus Blood Collection Tubes (BD Biosciences, San Jose, CA, USA). Blood was layered over Ficoll‐Paque™ PLUS (GE Healthcare, Little Chalfont, Buckinghamshire, UK) to isolate peripheral blood mononuclear cells (PBMCs). PBMCs were counted using a hemocytometer.
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2

PBMC Isolation and RNA Extraction

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Blood was collected from VL patients and ECs into BD Vacutainer® Lithium HeparinN (LH) 170 I.U. Plus Blood Collection Tubes (BD Biosciences). Blood was layered over Lymphoprep (StemCell Technologies, Inc.) to isolate PBMCs. CD4+ T cells were isolated from PBMCs by magnetic-activated cell sorting (MACS) using MS Columns and anti-human CD4 MicroBeads (both by Miltenyi Biotec, Bergisch Gladback, Germany) into RNAlater (Invitrogen, Carlsbad, CA). Cells were homogenized using the QIAshredder and RNA isolated using the RNeasy Mini Kit (both by QIAGEN, Hilden, Germany) according to manufacturer’s instructions. DNA digestion was performed using either the RNAase-free DNase set or DNase Max kit (both by QIAGEN). RNA was quantified using the Qubit RNA HS Assay kit on a Qubit 4 Fluorometer (Thermo Fisher, Waltham, MA). The quality of RNA was determined using the RNA 6000 Nano kit, run on a 2100 Bioanalyzer (both by Agilent Technologies, Santa Clara, CA) according to the manufacturer’s instructions where an RNA Integrity Number (RIN) value of above 8 was optimal.
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3

PBMC Isolation and RNA Extraction

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Blood was collected from VL patients and ECs into BD Vacutainer® Lithium HeparinN (LH) 170 I.U. Plus Blood Collection Tubes (BD Biosciences). Blood was layered over Lymphoprep (StemCell Technologies, Inc.) to isolate PBMCs. CD4+ T cells were isolated from PBMCs by magnetic-activated cell sorting (MACS) using MS Columns and anti-human CD4 MicroBeads (both by Miltenyi Biotec, Bergisch Gladback, Germany) into RNAlater (Invitrogen, Carlsbad, CA). Cells were homogenized using the QIAshredder and RNA isolated using the RNeasy Mini Kit (both by QIAGEN, Hilden, Germany) according to manufacturer’s instructions. DNA digestion was performed using either the RNAase-free DNase set or DNase Max kit (both by QIAGEN). RNA was quantified using the Qubit RNA HS Assay kit on a Qubit 4 Fluorometer (Thermo Fisher, Waltham, MA). The quality of RNA was determined using the RNA 6000 Nano kit, run on a 2100 Bioanalyzer (both by Agilent Technologies, Santa Clara, CA) according to the manufacturer’s instructions where an RNA Integrity Number (RIN) value of above 8 was optimal.
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