Tumor-infiltrating leukocytes (TILs) represent a minority of the complete cell population within tumor tissue. In this application protocol, we describe a time-saving workflow that overcomes this limitation and increases sensitivity of downstream analyses. Mouse tumor tissue is dissociated into a viable single-cell suspension and TILs (CD45+) are enriched via MACS® Technology.
PBE buffer: Prepare a solution containing phosphate-buffered saline (PBS), pH 7.2, 0.5 % bovine serum albumin (BSA), and 2 mM EDTA by diluting MACS BSA Stock Solution 1:20 with autoMACS Rinsing Solution. Keep buffer cold (2−8 °C). Prepare buffer fresh and degas prior to use.
▲ Note: EDTA can be replaced by other supplements such as anticoagulant citrate dextrose formula-A (ACD-A) or citrate phosphate dextrose (CPD). BSA can be replaced by other proteins such as mouse serum albumin, mouse serum, or fetal bovine serum (FBS). Buffers or media containing Ca2+ or Mg2+ are not recommended for use.
Create a viable single-cell suspension from a solid mouse tumor using the gentleMACS™ Octo Dissociator with Heaters in combination with the Tumor Dissociation Kit, mouse. Follow the protocol of the kit data sheet.
Download data sheet
Enrich tumor-infiltrating leukocytes using CD45 (TIL) MicroBeads, mouse, and LS or MS Columns. Follow the protocol of the kit data sheet.
We recommend filtering the magnetically labeled cell suspension to guarantee it is single-celled before separating it on the column.
Download the data sheet
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(Optional) Dead Cell Removal Kit (# 130-090-101) for the depletion of dead cells