Isolation and analysis of lymphocytes. (i) Isolation of mononuclear cells from
the spleen and CNS. Spleens were harvested from mice either at 5 or 7 days
postinfection. Spleen cell suspensions were prepared by gently homogenizing
spleens in a nylon bag (mesh opening, 64 m) with a syringe plunger in RPMI
1640 medium supplemented with 1% fetal calf serum. Then, red blood cells were
lysed with 0.83% NH4Cl. Mononuclear cells were prepared from the CNS as
previously described by Phillips et al. (25) on day 7 after i.c. inoculation. Three
to five brains were pooled per sample. In brief, animals were sacrificed and
perfused with 10 ml of PBS, and a single-cell suspension from the brain was
obtained by passing cells through a nylon mesh bag (mesh opening, 64 m).
Percoll (Pharmacia) was added to a final concentration of 30%, and the lysate
was centrifuged at 1,300 g for 30 min at 4°C. The cell pellet was resuspended,
passed through a cell strainer (pore diameter, 70 m; Becton Dickinson), and
washed. The cells were then layered over 2 ml of Lympholyte-M (Cedarlane
Laboratories) and centrifuged at 1,300 g for 20 min at room temperature. Cells
were removed from the interface, washed once, and counted.
Isolation and analysis of lymphocytes. (i) Isolation of mononuclear cells fromthe spleen and CNS. Spleens were harvested from mice either at 5 or 7 dayspostinfection. Spleen cell suspensions were prepared by gently homogenizingspleens in a nylon bag (mesh opening, 64 m) with a syringe plunger in RPMI1640 medium supplemented with 1% fetal calf serum. Then, red blood cells werelysed with 0.83% NH4Cl. Mononuclear cells were prepared from the CNS aspreviously described by Phillips et al. (25) on day 7 after i.c. inoculation. Threeto five brains were pooled per sample. In brief, animals were sacrificed andperfused with 10 ml of PBS, and a single-cell suspension from the brain wasobtained by passing cells through a nylon mesh bag (mesh opening, 64 m).Percoll (Pharmacia) was added to a final concentration of 30%, and the lysatewas centrifuged at 1,300 g for 30 min at 4°C. The cell pellet was resuspended,passed through a cell strainer (pore diameter, 70 m; Becton Dickinson), andwashed. The cells were then layered over 2 ml of Lympholyte-M (CedarlaneLaboratories) and centrifuged at 1,300 g for 20 min at room temperature. Cellswere removed from the interface, washed once, and counted.
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