Secondary Lymphoid-tissue Chemokine (SLC) is a recently identified CC chemokine that is constitutively expressed in various lymphoid tissues and is a potent and specific chemoattractant for lymphocytes. Thus, chemotaxis assay used 24-well microchemotaxis system was undertaken to detect the chemotactic effect of SLC on the human T-lymphocyte leukemia cell line Jurkat. Briefly, Jurkat cells were seeded into the upper chambers (100uL cell suspension,106 cells/mL in RPMI 1640 with FBS free) and SLC (1ng/mL, 15ng/mL and 150ng/mL diluted separately in serum free RPMI 1640) was added in lower chamber with a polycarbonate filter (8um pore size) used to separate the two compartments. After incubation at 37℃ with 5% CO2 for 1h, the filter was removed, then cells in low chamber were observed by inverted microscope at low magnification (×100) and the number of migrated cells were counted at high magnification (×400) randomly (five fields for each filter). Result shows SLC is able to induce migration of Jurkat cells. The migrated Jurkat cells in low chamber at low magnification (×100) were shown in Figure 1. Five fields of each chamber were randomly chosen, and the migrated cells were counted at high magnification (×400). Statistical results were shown in Figure 2. The optimum chemotaxis of SLC occurs at 15-150ng/mL.(A)Jurkat cells were seeded into the upper chambers and serum free RPMI 1640 with 150ng/mL SLC was added in lower chamber, then cells in lower chamber were observed at low magnification (×100) after incubation for 1h;
(B)Jurkat cells were seeded into the upper chambers and serum free RPMI 1640 without SLC was added in lower chamber, then cells in lower chamber were observed at low magnification (×100) after incubation for 1h.
Figure. The chemotactic effect of SLC on Jurkat cells

Figure .The chemotactic effect of SLC on Jurkat cells.