Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

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Shulman, Z. et al.

DOCK2 regulates chemokine-triggered lateral lymphocyte motility but not transendothelial migration.

Rac GTPases are key regulators of leukocyte motility. In lymphocytes, chemokine- mediated Rac activation depends on the CDM adaptor DOCK2. The present studies addressed the role of DOCK2 in chemokine-triggered lymphocyte adhesion and motility. Rapid chemokine- triggered activation of both LFA-1 and VLA-4 integrins took place normally in DOCK2(-/-) T lymphocytes under various shear flow conditions. Consequently, DOCK2(-/-) T cells arrested normally on TNFalpha- activated endothelial cells in response to integrin stimulatory chemokine signals, and their resistance to detachment was similar to that of wild-type (wt) T lymphocytes. Nevertheless, DOCK2(-/-) T lymphocytes exhibited reduced microvillar collapse and lamellipodium extension in response to chemokine signals, ruling out a role for these events in integrin-mediated adhesion strengthening. Strikingly, arrested DOCK2(-/-) lymphocytes transmigrated through a CCL21-presenting endothelial barrier with similar efficiency and rate as wt lymphocytes but, unlike wt lymphocytes, could not locomote away from the transmigration site of the basal endothelial side. DOCK2(-/-) lymphocytes also failed to laterally migrate over multiple integrin ligands coimmobilized with chemokines. This is a first indication that T lymphocytes use 2 different chemokine-triggered actin remodeling programs: the first, DOCK2 dependent, to locomote laterally along apical and basal endothelial surfaces; the second, DOCK2 independent, to cross through a chemokine-bearing endothelial barrier.[1]

References

DOCK2 regulates chemokine-triggered lateral lymphocyte motility but not transendothelial migration. Shulman, Z., Pasvolsky, R., Woolf, E., Grabovsky, V., Feigelson, S.W., Erez, N., Fukui, Y., Alon, R. Blood (2006) [Pubmed]

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