We will then review the results from studies in living animals that reveal how viruses exploit the natural flow of body fluids, specific tissue architecture, and patterns of cell circulation and migration to spread within the host.
Tumor metastasis may be divided into three different steps; separation of cancer cells from the primary tumor, circulation and migration of the cells through blood vessels to other organs, and finally, inhabitation of the cells in the target organs [25].
The barrier function is further impaired by mononuclear cells, which first adhere to the endothelium and then are triggered to leave the circulation via migration between endothelial cells.
Moreover, we have recently reported that TWIST expressing CTCs are frequently observed in patients with breast cancer [ 22, 23], suggesting that cancer cells might undergo EMT during vessel invasion, circulation and migration to metastatic sites.
Lynch, C. & Roper, C. The Transit Phase of Migration: Circulation of Malaria and Its Multidrug.
Newspaper editors, grappling with declining circulation and the migration of advertising spending to the internet, have been hoping for years that e-paper will move beyond the drawing board into reality.
Monocytes are also involved in different kinds of blood-associated biological processes including blood coagulation, blood circulation, and leukocyte migration.
The opposite effect is observed with granulocytes, which accumulate in blood circulation, whereas neutrophil migration toward inflammatory sites is inhibited (resulting from decreased secretion of chemokines), which contributes to a decreased local inflammatory reaction.
Second, to determine whether the availability of T cells in the circulation affects their migration into the joints and arthritis development, we used FTY720, a drug known to 'deplete' T cells in peripheral blood by inhibiting their exit from lymphoid organs [ 20- 22].
Before ducks undertake spring migration, AIV circulation is typically low, probably because of an important proportion of immunized ducks.
