Screen (pdf version)
ScreenFACS screen after MCMV infection
Posted On03/17/2017 3:20 PM
AuthorTao Yue

The fluoresence activated cell sorting (FACS) screen examines the major hematopoietic cell subsets in the blood in response to MCMV infection.

Reagents and Solutions




-1.5 mL Eppendorf microfuge tubes

-Mini-collect EDTA coated tubes

-FACs tubes



MCMV(8X106 pfu/ml)


Red blood cell lysis buffer


FACs buffer


-1% FCS

-0.02% sodium azide




Antibody cocktails



1. Inject MCMV (1.5X105 pfu per 20g) via Intraperitoneal injection into the G3 mouse. Return animals to housing.


Blood Preparation for FACS analysis

2. Five days post-MCMV infection, collect 100 μL blood in serum separator tubes.

3. Before staining and flow cytometric analysis, up to 75 μL blood is subjected to two rounds of red blood cell lysis

a) Add 1 mL lysis buffer to the blood and mix for 1 minute

b) Dilute the buffer with 3 mL of PBS

c) Centrifuge at 700 x g for 6 minutes and decant the supernatant.

d) Repeat steps a-c

e) Resuspend cell pellet in 50 μL of 1:200 Fc block in FACS buffer and incubate for 30 minutes on ice.

f) Wash the cells with 1 mL of PBS and spin down the cells at 700 x g for 6 minutes at 4°C.

g) Discard the supernatant and resuspend the cells with 50 μL of antibody cocktails including anti-CD3, CD4, CD8a, NK1.1, CD11b, CD11c, F4/80, CD45.2, B220, IgM, IgD, CD43, CD44, CD5 (1:100-1:300 in FACS Buffer; Table 1) and incubate for 30 minutes on ice.

h) Wash the cells twice with 1 mL of PBS and spin down the cells at 700 x g for 6 minutes at 4°C.

i) Resuspend the cells in 400 μL FACS buffer and analyze the cells on the flow cytometer.


Table 1. Antibodies used in the FACS screen

Antibody Readout
anti-CD3 CD3+ T cells
anti-CD4 CD4T cells
anti-CD8a CD8adendritic cells (DCs)
anti-NK1.1 NK1.1+ natural killer cells
anti-CD11b CD11b​macrophages
anti-CD11c CD11c​DCs
anti-F4/80 Macrophages
anti-CD45.2 T-cell and B-cell antiggen receptor signal transduction, cytokine signaling, and Fc receptor stimulation
anti-B220 B cells (pro-B to mature)
anti-IgM B cell memory (humoral immune responses)
anti-IgD B cells
anti-CD43 Bone marrow-derived cells (γ/δ T cells, macrophages, mature B cells, and dendritic cells)
anti-CD44 B and T lymphocytes, monocytes, granulocytes, and red blood cells
anti-CD5 T cells