Molecules implicated in lymphocyte adhesion to endothelial and epithelial cells within different compartments of the human liver
| Table 3. Molecules implicated in lymphocyte adhesion to endothelial and epithelial cells within different compartments of the human livera (tab003dab) | ||||||
| Adhesion phase | Bile ductule (molecules involved in retention) | Portal vessel (molecules involved in adhesion) |
Sinusoids (molecules involved in adhesion) |
|||
| Normal conditions | Inflamed conditions | Normal conditions | Inflamed conditions | Normal conditions | Inflamed conditions | |
| Initial capture or adhesion | VCAM-1, ICAM-1, CXCL16 | VCAM-1, ICAM-1, CXCL16 | VAP-1 | VAP-1, VCAM-1, P- and E-Sel | VAP-1 | VAP-1, VCAM-1 |
| Triggering | SDF |
SDF, IL-8, RANTES, MCP-1, CXCL16
|
RANTES, MCP-1, MIP-1a, IL-8 (low levels) | RANTES, MCP-1, MIP-1a and MIP-1b (high levels) | IP-10, MIG, ITAC (low levels) | IP-10, MIG, ITAC (high levels) |
| Arrest or retention | VCAM-1 | VCAM-1, ICAM-1, CXCL16 | ICAM-2 | VCAM-1, ICAM-1, ICAM-2 | ICAM-1 (low level) | VCAM-1, ICAM-1 |
|
a Differences in lymphocyte populations recruited to the different
anatomical compartments can be attributed to differential expression of
chemokines and adhesion molecules. Thus, CCR7-positive lymphocytes will
be retained by biliary epithelial cells in response to SDF expression,
whereas CXCR3-bearing lymphocytes will be recruited to sinusoidal endothelial
cells expressing IP-10, MIG or ITAC. Under inflammatory conditions broader
profiles of adhesion molecules and chemokines permit recruitment of a
wider range of lymphocyte subsets. Note that cells are not recruited directly
from the bile ductule, because bile ducts are not exposed to the blood
stream; thus, the molecules listed under bile ductule are involved in
retention. |
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